├── .gitignore ├── LICENSE ├── README.md ├── crossed-example.png ├── sketchy-example.png ├── spiral-example.png ├── src ├── blackstripes │ ├── __init__.py │ ├── blackstripes_signature.h │ ├── crossed-large.h │ ├── crossed-xlarge.h │ ├── crossed.c │ ├── sketchy.c │ └── spiral.c ├── cli │ └── blackstripes ├── lib │ ├── lodepng │ │ ├── lodepng.c │ │ └── lodepng.h │ └── sketchy │ │ ├── FSArray.c │ │ ├── FSArray.h │ │ ├── FSNumber.c │ │ ├── FSNumber.h │ │ ├── FSObject.c │ │ ├── FSObject.h │ │ ├── Point.c │ │ ├── Point.h │ │ ├── SketchyImage.c │ │ ├── SketchyImage.h │ │ └── bool.h └── setup.py └── test ├── ali.png ├── crossed-test.py ├── image.png ├── luxx_test.py ├── sketchy-test.py └── spiral-test.py /.gitignore: -------------------------------------------------------------------------------- 1 | # Byte-compiled / optimized / DLL files 2 | __pycache__/ 3 | *.py[cod] 4 | 5 | # C extensions 6 | *.so 7 | *.o 8 | 9 | #macosx 10 | .DS_Store 11 | 12 | 13 | # Distribution / packaging 14 | .idea/ 15 | .Python 16 | venv3/ 17 | venv/ 18 | env/ 19 | src/build/ 20 | develop-eggs/ 21 | dist/ 22 | downloads/ 23 | eggs/ 24 | .eggs/ 25 | lib64/ 26 | parts/ 27 | sdist/ 28 | var/ 29 | *.egg-info/ 30 | .installed.cfg 31 | *.egg 32 | 33 | # PyInstaller 34 | # Usually these files are written by a python script from a template 35 | # before PyInstaller builds the exe, so as to inject date/other infos into it. 36 | *.manifest 37 | *.spec 38 | 39 | # Installer logs 40 | pip-log.txt 41 | pip-delete-this-directory.txt 42 | 43 | # Unit test / coverage reports 44 | htmlcov/ 45 | .tox/ 46 | .coverage 47 | .coverage.* 48 | .cache 49 | nosetests.xml 50 | coverage.xml 51 | *,cover 52 | 53 | # Translations 54 | *.mo 55 | *.pot 56 | 57 | # Django stuff: 58 | *.log 59 | 60 | # Sphinx documentation 61 | docs/_build/ 62 | 63 | # PyBuilder 64 | target/ 65 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2015 Johan ten Broeke 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | 23 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Blackstripes python extensions 2 | ### Your drawbot will like it! 3 | 4 | This is a python module written in c. It turns an png image into a svg line drawing. The output is very suitable for vsg capable drawbots. We use it every day on [blackstripes.nl](http://www.blackstripes.nl). 5 | 6 | This also comes with a command-line interface for using it, installed at the same time as the python module. Check `blackstripes --help` for detailed usage. 7 | 8 | ## How to use 9 | 10 | This module exposes 3 drawing styles. 11 | 12 | ### 1. Sketchy 13 | 14 | from blackstripes import sketchy 15 | 16 | sketchy.draw("ali.png", # input 17 | "ali_sketchy.svg", # output 18 | 1, # nibsize (line size in output svg) 19 | 100, # max line length 20 | "#000000", # line color 21 | 0.32, # scaling factor 22 | 1, # line size (internal line size for calculations) 23 | 540, 1021, 0.7 # signature transform tx, ty, scale 24 | ) 25 | 26 | Using the CLI: 27 | 28 | blackstripes sketchy ali.png --output ali_sketchy.svg 29 | 30 | 31 | ![example](sketchy-example.png) 32 | 33 | ###### How does it work 34 | 35 | 1. Calculate the brightness of the input image. 36 | 2. Place the pen at pixel 0,0. 37 | 3. Get a random line length between 10 and the max segment length. 38 | 4. Evaluate 360 lines by making a 360 degree sweep with the selected line length. 39 | 5. Get the line covering the largest average darkness in the input image. 40 | 6. Draw this line white in the input image. 41 | 7. Draw this line black in the ouput image. 42 | 8. Calculate the brightness of the output image. 43 | 9. Repeat from step 2 until the brightness of the output image is equal to the inpute image. 44 | 45 | 46 | ### 2. Crossed 47 | 48 | from blackstripes import crossed 49 | 50 | crossed.draw("ali.png", # input 51 | "ali_crossed.svg", # output 52 | 2.0, # nibsize (line size in output svg) 53 | "#2200aa", # line color 54 | 0.32, # scaling factor 55 | 200, 146, 110, 56, # levels 56 | 2, # type 57 | 540,1021,0.7 # signature transform 58 | ) 59 | 60 | 61 | Using the CLI: 62 | 63 | blackstripes crossed ali.png --output ali_sketchy.svg 64 | 65 | 66 | ![example](crossed-example.png) 67 | 68 | 69 | ### 3. Spiral 70 | 71 | from blackstripes import spiral 72 | 73 | spiral.draw("ali.png", # input 74 | "ali_spiral.svg", # output 75 | 2.0 , # nibsize (line size in output svg) 76 | "#aa0000", # line color 77 | 0.32, # scaling factor 78 | 180, 108, 180, 108, # levels 79 | 2, # linespacing 80 | 540,1021,0.7 # signature transform 81 | ) 82 | 83 | 84 | Using the CLI: 85 | 86 | blackstripes spiral ali.png --output ali_sketchy.svg 87 | 88 | 89 | ![example](spiral-example.png) 90 | 91 | 92 | ## How to build 93 | 94 | (This module is tested with python 2.7 and python 3.4 on mac-osx and linux, but it will probably work on most platforms.) 95 | 96 | 1. Clone this repo 97 | 2. navigate to the src folder 98 | 3. `python setup.py build` 99 | 4. `python setup.py install` 100 | 5. navigate to the test folder 101 | 6. `python sketchy-test.py` 102 | 7. `python crossed-test.py` 103 | 8. `python spiral-test.py` 104 | -------------------------------------------------------------------------------- /crossed-example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fullscreennl/blackstripes-python-extensions/366d3899b79daad5b6c5332a0ec63201374e46e4/crossed-example.png -------------------------------------------------------------------------------- /sketchy-example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fullscreennl/blackstripes-python-extensions/366d3899b79daad5b6c5332a0ec63201374e46e4/sketchy-example.png -------------------------------------------------------------------------------- /spiral-example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fullscreennl/blackstripes-python-extensions/366d3899b79daad5b6c5332a0ec63201374e46e4/spiral-example.png -------------------------------------------------------------------------------- /src/blackstripes/__init__.py: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fullscreennl/blackstripes-python-extensions/366d3899b79daad5b6c5332a0ec63201374e46e4/src/blackstripes/__init__.py -------------------------------------------------------------------------------- /src/blackstripes/blackstripes_signature.h: -------------------------------------------------------------------------------- 1 | static char signature[] =""; 2 | -------------------------------------------------------------------------------- /src/blackstripes/crossed.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include "Python.h" 3 | #include "../lib/sketchy/SketchyImage.h" 4 | #include "../lib/sketchy/Point.h" 5 | #include "crossed-large.h" 6 | #include "crossed-xlarge.h" 7 | 8 | #include "blackstripes_signature.h" 9 | //char *signature = "\n"; 10 | 11 | static char module_docstring[] = "This module provides a blackstripes crossed png to svg conversion"; 12 | static char draw_docstring[] = "Make a svg blackstripes classic of the png"; 13 | 14 | static char svg_formatstring[] = "\ 15 | \ 16 | \ 27 | "; 28 | 29 | static PyObject *crossed_draw(PyObject *self, PyObject *args); 30 | 31 | static PyMethodDef module_methods[] = { 32 | {"draw", crossed_draw, METH_VARARGS, draw_docstring}, 33 | {NULL, NULL, 0, NULL} 34 | }; 35 | 36 | #if PY_MAJOR_VERSION >= 3 37 | static struct PyModuleDef moduledef = { 38 | PyModuleDef_HEAD_INIT, 39 | "crossed", /* m_name */ 40 | module_docstring, /* m_doc */ 41 | -1, /* m_size */ 42 | module_methods, /* m_methods */ 43 | NULL, /* m_reload */ 44 | NULL, /* m_traverse */ 45 | NULL, /* m_clear */ 46 | NULL, /* m_free */ 47 | }; 48 | #endif 49 | 50 | PyMODINIT_FUNC 51 | #if PY_MAJOR_VERSION >= 3 52 | PyInit_crossed(void) 53 | #else 54 | initcrossed(void) 55 | #endif 56 | { 57 | PyObject *m; 58 | #if PY_MAJOR_VERSION >= 3 59 | m = PyModule_Create(&moduledef); 60 | #else 61 | m = Py_InitModule3("crossed", module_methods, module_docstring); 62 | #endif 63 | 64 | #if PY_MAJOR_VERSION >= 3 65 | return m; 66 | #endif 67 | 68 | } 69 | 70 | static void appendSegment(FILE *svgFile, float fx, float fy, float tx, float ty, float radius, const char *color, float nib_size_mm, int dir){ 71 | const char *svg_segment_format = "\n"; 72 | fprintf(svgFile, svg_segment_format, 73 | fx, fy, 74 | radius, radius, 75 | dir, 76 | tx, ty, 77 | color, 78 | nib_size_mm 79 | ); 80 | } 81 | 82 | static void decodePNG(const char* filename,const char* output_filename,float nibsize, const char* color, float scale, int level0, int level1, int level2, int level3, int type, float sigTransX, float sigTransY, float sigScale){ 83 | 84 | SketchyImage *im = SketchyImage_allocWithFileName(filename); 85 | SketchyImage_setNibSize(im, nibsize); 86 | int width = SketchyImage_getCanvasWidth(im); 87 | int height = SketchyImage_getCanvasHeight(im); 88 | 89 | float x = 0; 90 | float y = 0; 91 | float from_x = 0; 92 | float from_y = 0; 93 | float to_x = 0; 94 | float to_y = 0; 95 | 96 | int threshold = level0; 97 | int newstate = 1; 98 | int penstate = -1; 99 | int pixelvalue = 0; 100 | int layerIndex = 0; 101 | 102 | int *levels = (int *)malloc(4*sizeof(int)); 103 | levels[0] = level0; 104 | levels[1] = level1; 105 | levels[2] = level2; 106 | levels[3] = level3; 107 | 108 | FILE *svgFile = fopen(output_filename, "w"); 109 | int extraHeight = 100; 110 | if(sigScale == 0.0){ 111 | extraHeight = 0; 112 | } 113 | fprintf(svgFile,svg_formatstring,"100%","100%", width * scale, (height + extraHeight) * scale, width * scale, (height + extraHeight) * scale, scale); 114 | 115 | int i = 0; 116 | float radius = 0; 117 | 118 | int16_t *coords; 119 | int size; 120 | if(type == 1){ 121 | coords = coords_l; 122 | size = sizeof(coords_l); 123 | }else{ 124 | coords = coords_xl; 125 | size = sizeof(coords_xl); 126 | } 127 | 128 | for(i = 0; i < size / sizeof(int16_t); i += 2) 129 | { 130 | if(coords[i] == -20){ 131 | layerIndex ++; 132 | threshold = levels[layerIndex]; 133 | }else if(coords[i] == -10){ 134 | radius = coords[i+1] / 10.0; 135 | newstate = 0; 136 | if (newstate != penstate){ 137 | to_x = x; 138 | to_y = y; 139 | appendSegment(svgFile, from_x, from_y, to_x, to_y, radius, color, nibsize, 1); 140 | } 141 | penstate = newstate; 142 | }else{ 143 | x = coords[i] / 10.0; 144 | y = coords[i+1] / 10.0; 145 | pixelvalue = SketchyImage_getPixel(im,(int)round(x),(int)round(y)); 146 | if (pixelvalue < threshold){ 147 | newstate = 1; 148 | if (newstate != penstate){ 149 | from_x = x; 150 | from_y = y; 151 | } 152 | penstate = newstate; 153 | }else{ 154 | newstate = 0; 155 | if (newstate != penstate){ 156 | to_x = x; 157 | to_y = y; 158 | appendSegment(svgFile, from_x, from_y, to_x, to_y, radius, color, nibsize, 1); 159 | } 160 | penstate = newstate; 161 | } 162 | } 163 | } 164 | char sig[80000]; 165 | int success = 1; 166 | if(sigScale != 0.0){ 167 | success = sprintf(sig, signature, sigTransX, sigTransY, sigScale, nibsize / sigScale, color); 168 | }else{ 169 | strcpy(sig, ""); 170 | } 171 | 172 | if (success){ 173 | fprintf(svgFile,"%s\n", sig); 174 | } 175 | fclose(svgFile); 176 | SketchyImage_release(im); 177 | 178 | char rsvgCommand[200]; 179 | int rsvg_command_status = sprintf(rsvgCommand, "rsvg-convert -a -w 1000 %s -o %s.png --background-color '#ffffff'", output_filename, output_filename); 180 | if(rsvg_command_status){ 181 | system(rsvgCommand); 182 | } 183 | 184 | } 185 | 186 | static PyObject *crossed_draw(PyObject *self, PyObject *args){ 187 | const char *inputpng = ""; 188 | const char *filename = ""; 189 | const char *color = ""; 190 | float nibsize = 1; 191 | float scale = 1.0; 192 | int level0 = 1; 193 | int level1 = 1; 194 | int level2 = 1; 195 | int level3 = 1; 196 | int type = 1; 197 | float sigTransX = 0.0; 198 | float sigTransY = 0.0; 199 | float sigScale = 1.0; 200 | if (!PyArg_ParseTuple(args, "ssfsfiiiiifff", &inputpng, &filename, &nibsize , &color, &scale, &level0, &level1, &level2, &level3, &type, &sigTransX, &sigTransY, &sigScale)){ 201 | return NULL; 202 | } 203 | 204 | decodePNG(inputpng, filename, nibsize, color, scale, level0, level1, level2, level3, type, sigTransX, sigTransY, sigScale); 205 | 206 | PyObject *ret = Py_BuildValue("i", 0); 207 | return ret; 208 | } 209 | -------------------------------------------------------------------------------- /src/blackstripes/sketchy.c: -------------------------------------------------------------------------------- 1 | #include "Python.h" 2 | #include "../lib/sketchy/SketchyImage.h" 3 | #include "../lib/sketchy/Point.h" 4 | #include "blackstripes_signature.h" 5 | 6 | static char module_docstring[] = "This module provides a sketchy png to svg conversion"; 7 | static char sketch_docstring[] = "Make a svg sketch of the png"; 8 | 9 | static char svg_formatstring[] = "\ 10 | \ 11 | \ 22 | \ 23 | = 3 33 | static struct PyModuleDef moduledef = { 34 | PyModuleDef_HEAD_INIT, 35 | "sketchy", /* m_name */ 36 | module_docstring, /* m_doc */ 37 | -1, /* m_size */ 38 | module_methods, /* m_methods */ 39 | NULL, /* m_reload */ 40 | NULL, /* m_traverse */ 41 | NULL, /* m_clear */ 42 | NULL, /* m_free */ 43 | }; 44 | #endif 45 | 46 | PyMODINIT_FUNC 47 | #if PY_MAJOR_VERSION >= 3 48 | PyInit_sketchy(void) 49 | #else 50 | initsketchy(void) 51 | #endif 52 | { 53 | PyObject *m; 54 | #if PY_MAJOR_VERSION >= 3 55 | m = PyModule_Create(&moduledef); 56 | #else 57 | m = Py_InitModule3("sketchy", module_methods, module_docstring); 58 | #endif 59 | 60 | #if PY_MAJOR_VERSION >= 3 61 | return m; 62 | #endif 63 | 64 | } 65 | 66 | static void decodePNG(const char* filename,const char* output_filename,int maxLineLength,float nibsize, const char* color, float scale, int linesize, float sigTransX, float sigTransY, float sigScale){ 67 | 68 | SketchyImage *im = SketchyImage_allocWithFileName(filename); 69 | SketchyImage_setNibSize(im, linesize); 70 | float avg = SketchyImage_getAvgBrightness(im); 71 | long int threshold = SketchyImage_getBrightness(im); 72 | if(avg < 128){ 73 | threshold = threshold * (128.0/avg); 74 | } 75 | long int outputBrightness = SketchyImage_getOutputBrightness(im); 76 | int width = SketchyImage_getCanvasWidth(im); 77 | int height = SketchyImage_getCanvasHeight(im); 78 | 79 | Point *darkestPixel = SketchyImage_getDarkPixel(im); 80 | 81 | int x = darkestPixel->x; 82 | int y = darkestPixel->y; 83 | 84 | Point_release(darkestPixel); 85 | 86 | FILE *svgFile = fopen(output_filename, "w"); 87 | int extraHeight = 100; 88 | if(sigScale == 0.0){ 89 | extraHeight = 0; 90 | } 91 | fprintf(svgFile,svg_formatstring,"100%","100%", width * scale, (height + extraHeight) * scale, width * scale, (height + extraHeight) * scale, scale); 92 | 93 | srand(time(NULL)); 94 | 95 | while(outputBrightness > threshold){ 96 | int r = 10 + rand()%maxLineLength; 97 | Point *p = SketchyImage_bestPointOfNDestinationsFromXY2(im,r,x,y); 98 | fprintf(svgFile,"%i,%i ", x, y); 99 | outputBrightness = SketchyImage_getOutputBrightness(im); 100 | x = p->x; 101 | y = p->y; 102 | } 103 | 104 | char sig[80000]; 105 | int success = 1; 106 | if(sigScale != 0.0){ 107 | success = sprintf(sig, signature, sigTransX, sigTransY, sigScale, nibsize, color); 108 | }else{ 109 | strcpy(sig, ""); 110 | } 111 | if (success){ 112 | fprintf(svgFile,"\" style=\"fill:none;stroke:%s;stroke-width:%f;stroke-linecap:round;stroke-linejoin:round;\" />%s\n", color, nibsize, sig); 113 | } 114 | fclose(svgFile); 115 | 116 | //SketchyImage_saveAsPNG(im,output_filename); 117 | //SketchyImage_saveStateAsPNG(im,"state.png"); 118 | 119 | SketchyImage_release(im); 120 | 121 | char rsvgCommand[200]; 122 | int rsvg_command_status = sprintf(rsvgCommand, "rsvg-convert -a -w 1000 %s -o %s.png --background-color '#ffffff'", output_filename, output_filename); 123 | if(rsvg_command_status){ 124 | system(rsvgCommand); 125 | } 126 | 127 | } 128 | 129 | static PyObject *sketchy_sketch(PyObject *self, PyObject *args){ 130 | const char *inputpng = ""; 131 | const char *filename = ""; 132 | const char *color = ""; 133 | float nibsize = 1; 134 | int linesize = 1; 135 | int maxLineLength = 50; 136 | float scale = 1.0; 137 | float sigTransX = 0.0; 138 | float sigTransY = 0.0; 139 | float sigScale = 1.0; 140 | if (!PyArg_ParseTuple(args, "ssfisfifff", &inputpng, &filename, &nibsize, &maxLineLength, &color, &scale, &linesize, &sigTransX, &sigTransY, &sigScale)){ 141 | return NULL; 142 | } 143 | 144 | decodePNG(inputpng, filename, maxLineLength, nibsize, color, scale, linesize, sigTransX, sigTransY, sigScale); 145 | 146 | PyObject *ret = Py_BuildValue("i", 0); 147 | return ret; 148 | } 149 | -------------------------------------------------------------------------------- /src/blackstripes/spiral.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include "Python.h" 4 | #include "../lib/sketchy/SketchyImage.h" 5 | #include "../lib/sketchy/Point.h" 6 | #include "blackstripes_signature.h" 7 | //char *signature = "\n"; 8 | 9 | static char module_docstring[] = "This module provides a blackstripes spiral png to svg conversion"; 10 | static char draw_docstring[] = "Make a svg blackstripes spiral of the png"; 11 | 12 | static char svg_formatstring[] = "\ 13 | \ 14 | \ 25 | "; 26 | 27 | static PyObject *spiral_draw(PyObject *self, PyObject *args); 28 | 29 | static PyMethodDef module_methods[] = { 30 | {"draw", spiral_draw, METH_VARARGS, draw_docstring}, 31 | {NULL, NULL, 0, NULL} 32 | }; 33 | 34 | #if PY_MAJOR_VERSION >= 3 35 | static struct PyModuleDef moduledef = { 36 | PyModuleDef_HEAD_INIT, 37 | "spiral", /* m_name */ 38 | module_docstring, /* m_doc */ 39 | -1, /* m_size */ 40 | module_methods, /* m_methods */ 41 | NULL, /* m_reload */ 42 | NULL, /* m_traverse */ 43 | NULL, /* m_clear */ 44 | NULL, /* m_free */ 45 | }; 46 | #endif 47 | 48 | PyMODINIT_FUNC 49 | #if PY_MAJOR_VERSION >= 3 50 | PyInit_spiral(void) 51 | #else 52 | initspiral(void) 53 | #endif 54 | { 55 | PyObject *m; 56 | #if PY_MAJOR_VERSION >= 3 57 | m = PyModule_Create(&moduledef); 58 | #else 59 | m = Py_InitModule3("spiral", module_methods, module_docstring); 60 | #endif 61 | 62 | #if PY_MAJOR_VERSION >= 3 63 | return m; 64 | #endif 65 | 66 | } 67 | 68 | static void appendOpenSegment(FILE *svgFile, float fx, float fy){ 69 | const char *svg_segment_format = "\n"; 75 | int dir = 1; 76 | int long_way_home = 0; 77 | if (segment_iterations > 1800){ 78 | long_way_home = 1; 79 | } 80 | fprintf(svgFile, svg_segment_format, radius, radius, long_way_home, dir, tx, ty, color, nib_size_mm); 81 | } 82 | 83 | static void decodePNG(const char* filename,const char* output_filename,float nibsize, const char* color, 84 | float scale, int level0, int level1, int level2, int level3, int linespacing, 85 | float sigTransX, float sigTransY, float sigScale, int roundShape){ 86 | 87 | SketchyImage *im = SketchyImage_allocWithFileName(filename); 88 | SketchyImage_setNibSize(im, nibsize); 89 | int width = SketchyImage_getCanvasWidth(im); 90 | int height = SketchyImage_getCanvasHeight(im); 91 | 92 | int *levels = (int *)malloc(4*sizeof(int)); 93 | levels[0] = level0; 94 | levels[1] = level1; 95 | levels[2] = level2; 96 | levels[3] = level3; 97 | 98 | int level_id = 0; 99 | 100 | float x = 0; 101 | float y = 0; 102 | float from_x = 0; 103 | float from_y = 0; 104 | float to_x = 0; 105 | float to_y = 0; 106 | 107 | FILE *svgFile = fopen(output_filename, "w"); 108 | int extraHeight = 100; 109 | if(sigScale == 0.0){ 110 | extraHeight = 0; 111 | } 112 | fprintf(svgFile,svg_formatstring,"100%","100%", width * scale, (height + extraHeight) * scale, width * scale, (height + extraHeight) * scale, scale); 113 | 114 | int i = 0; 115 | float radius = sqrt((width / 2.0) * (width / 2.0) + (height / 2.0) * (height / 2.0)); 116 | if(roundShape){ 117 | radius = width / 2.0; 118 | } 119 | 120 | int num_cycles = radius / linespacing; 121 | int numiterations = 3600 * num_cycles; 122 | float degree_to_radian_fact = 0.0174532925; 123 | 124 | float centerx = width / 2.0; 125 | float centery = height / 2.0; 126 | int pixelvalue = 0; 127 | 128 | int num_levels = 4; 129 | 130 | int penstate = 0; 131 | int newstate = 0; 132 | int segment_iterations = 0; 133 | 134 | while (numiterations > i){ 135 | 136 | if (i % 3600 == 0){ 137 | if(penstate == 1){ 138 | to_x = x; 139 | to_y = y; 140 | penstate = 0; 141 | appendCloseSegment(svgFile, to_x, to_y, radius, color, nibsize, segment_iterations); 142 | } 143 | radius -= linespacing; 144 | level_id ++; 145 | if (level_id > num_levels - 1){ 146 | level_id = 0; 147 | } 148 | } 149 | 150 | x = cos((i * degree_to_radian_fact) / 10.0) * radius + centerx; 151 | y = sin((i * degree_to_radian_fact) / 10.0) * radius + centery; 152 | 153 | if(x < 0 || x > width || y < 0 || y > height){ 154 | pixelvalue = 999; 155 | }else{ 156 | pixelvalue = SketchyImage_getPixel(im,(int)floor(x),(int)floor(y)); 157 | } 158 | 159 | if (pixelvalue < levels[level_id]){ 160 | newstate = 1; 161 | if (newstate != penstate){ 162 | from_x = x; 163 | from_y = y; 164 | appendOpenSegment(svgFile , from_x, from_y); 165 | segment_iterations = 0; 166 | } 167 | penstate = newstate; 168 | }else{ 169 | newstate = 0; 170 | if (newstate != penstate){ 171 | to_x = x; 172 | to_y = y; 173 | appendCloseSegment(svgFile, to_x, to_y, radius, color, nibsize, segment_iterations); 174 | } 175 | penstate = newstate; 176 | } 177 | 178 | i ++; 179 | segment_iterations ++; 180 | } 181 | 182 | appendCloseSegment(svgFile, to_x, to_y, radius, color, nibsize, segment_iterations); 183 | 184 | char sig[80000]; 185 | int success = 1; 186 | if(sigScale != 0.0){ 187 | success = sprintf(sig, signature, sigTransX, sigTransY, sigScale, nibsize, color); 188 | }else{ 189 | strcpy(sig, ""); 190 | } 191 | if (success){ 192 | fprintf(svgFile,"%s\n", sig); 193 | } 194 | fclose(svgFile); 195 | SketchyImage_release(im); 196 | 197 | char rsvgCommand[200]; 198 | int rsvg_command_status = sprintf(rsvgCommand, "rsvg-convert -a -w 1000 %s -o %s.png --background-color '#ffffff'", output_filename, output_filename); 199 | if(rsvg_command_status){ 200 | system(rsvgCommand); 201 | } 202 | 203 | } 204 | 205 | static PyObject *spiral_draw(PyObject *self, PyObject *args){ 206 | const char *inputpng = ""; 207 | const char *filename = ""; 208 | const char *color = ""; 209 | float nibsize = 1; 210 | float scale = 1.0; 211 | int level0 = 1; 212 | int level1 = 1; 213 | int level2 = 1; 214 | int level3 = 1; 215 | int linespacing = 1; 216 | float sigTransX = 0.0; 217 | float sigTransY = 0.0; 218 | float sigScale = 1.0; 219 | int roundShape = 0; 220 | if (!PyArg_ParseTuple(args, "ssfsfiiiiifff|i", &inputpng, &filename, &nibsize, &color, 221 | &scale, &level0, &level1, &level2, &level3, &linespacing, 222 | &sigTransX, &sigTransY, &sigScale, &roundShape)){ 223 | return NULL; 224 | } 225 | 226 | decodePNG(inputpng, filename, nibsize, color, scale, level0, level1, level2, level3, 227 | linespacing, sigTransX, sigTransY, sigScale, roundShape); 228 | 229 | PyObject *ret = Py_BuildValue("i", 0); 230 | return ret; 231 | } 232 | -------------------------------------------------------------------------------- /src/cli/blackstripes: -------------------------------------------------------------------------------- 1 | #!/usr/bin/python 2 | from blackstripes import spiral, sketchy, crossed 3 | import argparse 4 | import re 5 | import os 6 | import webbrowser 7 | import sys 8 | 9 | 10 | def hex_code(string): 11 | if re.search(r'^#?(?:[0-9a-fA-F]{3}){1,2}$', string): 12 | if string[0] != "#": 13 | string = "#" + string 14 | return string 15 | msg = "%r is not a valid hex color" % string 16 | raise argparse.ArgumentTypeError(msg) 17 | 18 | 19 | def get_output(input_path): 20 | basename = os.path.basename(input_path) 21 | name = ".".join(basename.split(".")[:-1]) 22 | return name + ".svg" 23 | 24 | 25 | def get_output_png_path(output_path): 26 | return output_path + ".png" 27 | 28 | 29 | def apply_spiral(args): 30 | draw_args = [ 31 | args.input_path, 32 | args.output_path, 33 | args.linewidth, 34 | args.color, 35 | args.scale 36 | ] \ 37 | + args.levels \ 38 | + [args.linespacing] \ 39 | + args.sigtransform \ 40 | + [args.round] 41 | spiral.draw(*draw_args) 42 | 43 | 44 | def apply_crossed(args): 45 | draw_args = [ 46 | args.input_path, 47 | args.output_path, 48 | args.linewidth, 49 | args.color, 50 | args.scale 51 | ] \ 52 | + args.levels \ 53 | + [args.type] \ 54 | + args.sigtransform 55 | crossed.draw(*draw_args) 56 | 57 | 58 | def apply_sketchy(args): 59 | draw_args = [ 60 | args.input_path, 61 | args.output_path, 62 | args.linewidth, 63 | args.maxlinelength, 64 | args.color, 65 | args.scale, 66 | args.internallinesize, 67 | ] \ 68 | + args.sigtransform 69 | sketchy.draw(*draw_args) 70 | 71 | 72 | argparser = argparse.ArgumentParser() 73 | subparsers = argparser.add_subparsers(dest="command") 74 | subparsers.required = True 75 | parser_sketchy = subparsers.add_parser('sketchy') 76 | parser_spiral = subparsers.add_parser('spiral') 77 | parser_crossed = subparsers.add_parser('crossed') 78 | 79 | 80 | class A: 81 | def __init__(self, *args, **kwargs): 82 | self.args = args 83 | self.kwargs = kwargs 84 | 85 | def go(self, parser): 86 | parser.add_argument(*self.args, **self.kwargs) 87 | 88 | 89 | queue = { 90 | parser_sketchy: [], 91 | parser_spiral: [], 92 | parser_crossed: [] 93 | } 94 | 95 | 96 | def add(parsers, args): 97 | for parser in parsers: 98 | queue[parser] += args 99 | 100 | 101 | add( 102 | [parser_sketchy, parser_spiral, parser_crossed], 103 | [ 104 | A("output", nargs="?"), 105 | A("input", nargs=1), 106 | A("--output", "-o"), 107 | A("--linewidth", "--nibsize", 108 | "--width", "-n", type=float, default=2.0), 109 | A("--color", "-c", type=hex_code, default="#000000"), 110 | A("--scale", "-s", type=float, default=1.0), 111 | A("--sigtransform", "--sig", "-t", nargs=3, 112 | type=float, default=[0, 0, 0], metavar=("X", "Y", "SCALE")), 113 | A("--preview-svg", action="store_true", 114 | help="preview the output svg and exit"), 115 | A("--preview-png", "--preview", "-p", 116 | action="store_true", help="preview the output png and exit") 117 | ] 118 | ) 119 | add( 120 | [parser_spiral, parser_crossed], 121 | [ 122 | A("--levels", nargs=4, type=int, 123 | default=[180, 108, 180, 108], metavar="LEVEL") 124 | ] 125 | ) 126 | add( 127 | [parser_spiral], 128 | [ 129 | A("--linespacing", "--spacing", type=int, default=2), 130 | A("--round", "-r", action="store_true") 131 | ] 132 | ) 133 | add( 134 | [parser_sketchy], 135 | [ 136 | A("--internallinesize", "--linesize", 137 | "-S", type=int, default=2), 138 | A("--maxlinelength", "--maxlen", 139 | "-m", type=int, default=100) 140 | ] 141 | ) 142 | add( 143 | [parser_crossed], 144 | [ 145 | A("--type", type=int, default=1) 146 | ] 147 | ) 148 | 149 | 150 | for parser in queue: 151 | for a in queue[parser]: 152 | a.go(parser) 153 | 154 | parser_spiral.set_defaults(func=apply_spiral) 155 | parser_crossed.set_defaults(func=apply_crossed) 156 | parser_sketchy.set_defaults(func=apply_sketchy) 157 | 158 | 159 | def apply_args(str_args): 160 | args = argparser.parse_args(str_args) 161 | args.input_path = args.input[-1] 162 | args.output_path = args.output or get_output(args.input[-1]) 163 | args.func(args) 164 | if args.preview_svg: 165 | webbrowser.open(args.output_path) 166 | if args.preview_png: 167 | webbrowser.open(get_output_png_path(args.output_path)) 168 | 169 | 170 | if __name__ == "__main__": 171 | apply_args(sys.argv[1:]) 172 | -------------------------------------------------------------------------------- /src/lib/lodepng/lodepng.h: -------------------------------------------------------------------------------- 1 | /* 2 | LodePNG version 20141130 3 | 4 | Copyright (c) 2005-2014 Lode Vandevenne 5 | 6 | This software is provided 'as-is', without any express or implied 7 | warranty. In no event will the authors be held liable for any damages 8 | arising from the use of this software. 9 | 10 | Permission is granted to anyone to use this software for any purpose, 11 | including commercial applications, and to alter it and redistribute it 12 | freely, subject to the following restrictions: 13 | 14 | 1. The origin of this software must not be misrepresented; you must not 15 | claim that you wrote the original software. If you use this software 16 | in a product, an acknowledgment in the product documentation would be 17 | appreciated but is not required. 18 | 19 | 2. Altered source versions must be plainly marked as such, and must not be 20 | misrepresented as being the original software. 21 | 22 | 3. This notice may not be removed or altered from any source 23 | distribution. 24 | */ 25 | 26 | #ifndef LODEPNG_H 27 | #define LODEPNG_H 28 | 29 | #include /*for size_t*/ 30 | 31 | #ifdef __cplusplus 32 | #include 33 | #include 34 | #endif /*__cplusplus*/ 35 | 36 | #define LODEPNG_VERSION_STRING "20141130" 37 | 38 | /* 39 | The following #defines are used to create code sections. They can be disabled 40 | to disable code sections, which can give faster compile time and smaller binary. 41 | The "NO_COMPILE" defines are designed to be used to pass as defines to the 42 | compiler command to disable them without modifying this header, e.g. 43 | -DLODEPNG_NO_COMPILE_ZLIB for gcc. 44 | */ 45 | /*deflate & zlib. If disabled, you must specify alternative zlib functions in 46 | the custom_zlib field of the compress and decompress settings*/ 47 | #ifndef LODEPNG_NO_COMPILE_ZLIB 48 | #define LODEPNG_COMPILE_ZLIB 49 | #endif 50 | /*png encoder and png decoder*/ 51 | #ifndef LODEPNG_NO_COMPILE_PNG 52 | #define LODEPNG_COMPILE_PNG 53 | #endif 54 | /*deflate&zlib decoder and png decoder*/ 55 | #ifndef LODEPNG_NO_COMPILE_DECODER 56 | #define LODEPNG_COMPILE_DECODER 57 | #endif 58 | /*deflate&zlib encoder and png encoder*/ 59 | #ifndef LODEPNG_NO_COMPILE_ENCODER 60 | #define LODEPNG_COMPILE_ENCODER 61 | #endif 62 | /*the optional built in harddisk file loading and saving functions*/ 63 | #ifndef LODEPNG_NO_COMPILE_DISK 64 | #define LODEPNG_COMPILE_DISK 65 | #endif 66 | /*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/ 67 | #ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS 68 | #define LODEPNG_COMPILE_ANCILLARY_CHUNKS 69 | #endif 70 | /*ability to convert error numerical codes to English text string*/ 71 | #ifndef LODEPNG_NO_COMPILE_ERROR_TEXT 72 | #define LODEPNG_COMPILE_ERROR_TEXT 73 | #endif 74 | /*Compile the default allocators (C's free, malloc and realloc). If you disable this, 75 | you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your 76 | source files with custom allocators.*/ 77 | #ifndef LODEPNG_NO_COMPILE_ALLOCATORS 78 | #define LODEPNG_COMPILE_ALLOCATORS 79 | #endif 80 | /*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/ 81 | #ifdef __cplusplus 82 | #ifndef LODEPNG_NO_COMPILE_CPP 83 | #define LODEPNG_COMPILE_CPP 84 | #endif 85 | #endif 86 | 87 | #ifdef LODEPNG_COMPILE_PNG 88 | /*The PNG color types (also used for raw).*/ 89 | typedef enum LodePNGColorType 90 | { 91 | LCT_GREY = 0, /*greyscale: 1,2,4,8,16 bit*/ 92 | LCT_RGB = 2, /*RGB: 8,16 bit*/ 93 | LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/ 94 | LCT_GREY_ALPHA = 4, /*greyscale with alpha: 8,16 bit*/ 95 | LCT_RGBA = 6 /*RGB with alpha: 8,16 bit*/ 96 | } LodePNGColorType; 97 | 98 | #ifdef LODEPNG_COMPILE_DECODER 99 | /* 100 | Converts PNG data in memory to raw pixel data. 101 | out: Output parameter. Pointer to buffer that will contain the raw pixel data. 102 | After decoding, its size is w * h * (bytes per pixel) bytes larger than 103 | initially. Bytes per pixel depends on colortype and bitdepth. 104 | Must be freed after usage with free(*out). 105 | Note: for 16-bit per channel colors, uses big endian format like PNG does. 106 | w: Output parameter. Pointer to width of pixel data. 107 | h: Output parameter. Pointer to height of pixel data. 108 | in: Memory buffer with the PNG file. 109 | insize: size of the in buffer. 110 | colortype: the desired color type for the raw output image. See explanation on PNG color types. 111 | bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types. 112 | Return value: LodePNG error code (0 means no error). 113 | */ 114 | unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, 115 | const unsigned char* in, size_t insize, 116 | LodePNGColorType colortype, unsigned bitdepth); 117 | 118 | /*Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image*/ 119 | unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, 120 | const unsigned char* in, size_t insize); 121 | 122 | /*Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image*/ 123 | unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, 124 | const unsigned char* in, size_t insize); 125 | 126 | #ifdef LODEPNG_COMPILE_DISK 127 | /* 128 | Load PNG from disk, from file with given name. 129 | Same as the other decode functions, but instead takes a filename as input. 130 | */ 131 | unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, 132 | const char* filename, 133 | LodePNGColorType colortype, unsigned bitdepth); 134 | 135 | /*Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image.*/ 136 | unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, 137 | const char* filename); 138 | 139 | /*Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image.*/ 140 | unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, 141 | const char* filename); 142 | #endif /*LODEPNG_COMPILE_DISK*/ 143 | #endif /*LODEPNG_COMPILE_DECODER*/ 144 | 145 | 146 | #ifdef LODEPNG_COMPILE_ENCODER 147 | /* 148 | Converts raw pixel data into a PNG image in memory. The colortype and bitdepth 149 | of the output PNG image cannot be chosen, they are automatically determined 150 | by the colortype, bitdepth and content of the input pixel data. 151 | Note: for 16-bit per channel colors, needs big endian format like PNG does. 152 | out: Output parameter. Pointer to buffer that will contain the PNG image data. 153 | Must be freed after usage with free(*out). 154 | outsize: Output parameter. Pointer to the size in bytes of the out buffer. 155 | image: The raw pixel data to encode. The size of this buffer should be 156 | w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth. 157 | w: width of the raw pixel data in pixels. 158 | h: height of the raw pixel data in pixels. 159 | colortype: the color type of the raw input image. See explanation on PNG color types. 160 | bitdepth: the bit depth of the raw input image. See explanation on PNG color types. 161 | Return value: LodePNG error code (0 means no error). 162 | */ 163 | unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, 164 | const unsigned char* image, unsigned w, unsigned h, 165 | LodePNGColorType colortype, unsigned bitdepth); 166 | 167 | /*Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image.*/ 168 | unsigned lodepng_encode32(unsigned char** out, size_t* outsize, 169 | const unsigned char* image, unsigned w, unsigned h); 170 | 171 | /*Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image.*/ 172 | unsigned lodepng_encode24(unsigned char** out, size_t* outsize, 173 | const unsigned char* image, unsigned w, unsigned h); 174 | 175 | #ifdef LODEPNG_COMPILE_DISK 176 | /* 177 | Converts raw pixel data into a PNG file on disk. 178 | Same as the other encode functions, but instead takes a filename as output. 179 | NOTE: This overwrites existing files without warning! 180 | */ 181 | unsigned lodepng_encode_file(const char* filename, 182 | const unsigned char* image, unsigned w, unsigned h, 183 | LodePNGColorType colortype, unsigned bitdepth); 184 | 185 | /*Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image.*/ 186 | unsigned lodepng_encode32_file(const char* filename, 187 | const unsigned char* image, unsigned w, unsigned h); 188 | 189 | /*Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image.*/ 190 | unsigned lodepng_encode24_file(const char* filename, 191 | const unsigned char* image, unsigned w, unsigned h); 192 | #endif /*LODEPNG_COMPILE_DISK*/ 193 | #endif /*LODEPNG_COMPILE_ENCODER*/ 194 | 195 | 196 | #ifdef LODEPNG_COMPILE_CPP 197 | namespace lodepng 198 | { 199 | #ifdef LODEPNG_COMPILE_DECODER 200 | /*Same as lodepng_decode_memory, but decodes to an std::vector. The colortype 201 | is the format to output the pixels to. Default is RGBA 8-bit per channel.*/ 202 | unsigned decode(std::vector& out, unsigned& w, unsigned& h, 203 | const unsigned char* in, size_t insize, 204 | LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); 205 | unsigned decode(std::vector& out, unsigned& w, unsigned& h, 206 | const std::vector& in, 207 | LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); 208 | #ifdef LODEPNG_COMPILE_DISK 209 | /* 210 | Converts PNG file from disk to raw pixel data in memory. 211 | Same as the other decode functions, but instead takes a filename as input. 212 | */ 213 | unsigned decode(std::vector& out, unsigned& w, unsigned& h, 214 | const std::string& filename, 215 | LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); 216 | #endif //LODEPNG_COMPILE_DISK 217 | #endif //LODEPNG_COMPILE_DECODER 218 | 219 | #ifdef LODEPNG_COMPILE_ENCODER 220 | /*Same as lodepng_encode_memory, but encodes to an std::vector. colortype 221 | is that of the raw input data. The output PNG color type will be auto chosen.*/ 222 | unsigned encode(std::vector& out, 223 | const unsigned char* in, unsigned w, unsigned h, 224 | LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); 225 | unsigned encode(std::vector& out, 226 | const std::vector& in, unsigned w, unsigned h, 227 | LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); 228 | #ifdef LODEPNG_COMPILE_DISK 229 | /* 230 | Converts 32-bit RGBA raw pixel data into a PNG file on disk. 231 | Same as the other encode functions, but instead takes a filename as output. 232 | NOTE: This overwrites existing files without warning! 233 | */ 234 | unsigned encode(const std::string& filename, 235 | const unsigned char* in, unsigned w, unsigned h, 236 | LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); 237 | unsigned encode(const std::string& filename, 238 | const std::vector& in, unsigned w, unsigned h, 239 | LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); 240 | #endif //LODEPNG_COMPILE_DISK 241 | #endif //LODEPNG_COMPILE_ENCODER 242 | } //namespace lodepng 243 | #endif /*LODEPNG_COMPILE_CPP*/ 244 | #endif /*LODEPNG_COMPILE_PNG*/ 245 | 246 | #ifdef LODEPNG_COMPILE_ERROR_TEXT 247 | /*Returns an English description of the numerical error code.*/ 248 | const char* lodepng_error_text(unsigned code); 249 | #endif /*LODEPNG_COMPILE_ERROR_TEXT*/ 250 | 251 | #ifdef LODEPNG_COMPILE_DECODER 252 | /*Settings for zlib decompression*/ 253 | typedef struct LodePNGDecompressSettings LodePNGDecompressSettings; 254 | struct LodePNGDecompressSettings 255 | { 256 | unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/ 257 | 258 | /*use custom zlib decoder instead of built in one (default: null)*/ 259 | unsigned (*custom_zlib)(unsigned char**, size_t*, 260 | const unsigned char*, size_t, 261 | const LodePNGDecompressSettings*); 262 | /*use custom deflate decoder instead of built in one (default: null) 263 | if custom_zlib is used, custom_deflate is ignored since only the built in 264 | zlib function will call custom_deflate*/ 265 | unsigned (*custom_inflate)(unsigned char**, size_t*, 266 | const unsigned char*, size_t, 267 | const LodePNGDecompressSettings*); 268 | 269 | const void* custom_context; /*optional custom settings for custom functions*/ 270 | }; 271 | 272 | extern const LodePNGDecompressSettings lodepng_default_decompress_settings; 273 | void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings); 274 | #endif /*LODEPNG_COMPILE_DECODER*/ 275 | 276 | #ifdef LODEPNG_COMPILE_ENCODER 277 | /* 278 | Settings for zlib compression. Tweaking these settings tweaks the balance 279 | between speed and compression ratio. 280 | */ 281 | typedef struct LodePNGCompressSettings LodePNGCompressSettings; 282 | struct LodePNGCompressSettings /*deflate = compress*/ 283 | { 284 | /*LZ77 related settings*/ 285 | unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/ 286 | unsigned use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/ 287 | unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048.*/ 288 | unsigned minmatch; /*mininum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/ 289 | unsigned nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/ 290 | unsigned lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/ 291 | 292 | /*use custom zlib encoder instead of built in one (default: null)*/ 293 | unsigned (*custom_zlib)(unsigned char**, size_t*, 294 | const unsigned char*, size_t, 295 | const LodePNGCompressSettings*); 296 | /*use custom deflate encoder instead of built in one (default: null) 297 | if custom_zlib is used, custom_deflate is ignored since only the built in 298 | zlib function will call custom_deflate*/ 299 | unsigned (*custom_deflate)(unsigned char**, size_t*, 300 | const unsigned char*, size_t, 301 | const LodePNGCompressSettings*); 302 | 303 | const void* custom_context; /*optional custom settings for custom functions*/ 304 | }; 305 | 306 | extern const LodePNGCompressSettings lodepng_default_compress_settings; 307 | void lodepng_compress_settings_init(LodePNGCompressSettings* settings); 308 | #endif /*LODEPNG_COMPILE_ENCODER*/ 309 | 310 | #ifdef LODEPNG_COMPILE_PNG 311 | /* 312 | Color mode of an image. Contains all information required to decode the pixel 313 | bits to RGBA colors. This information is the same as used in the PNG file 314 | format, and is used both for PNG and raw image data in LodePNG. 315 | */ 316 | typedef struct LodePNGColorMode 317 | { 318 | /*header (IHDR)*/ 319 | LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/ 320 | unsigned bitdepth; /*bits per sample, see PNG standard or documentation further in this header file*/ 321 | 322 | /* 323 | palette (PLTE and tRNS) 324 | 325 | Dynamically allocated with the colors of the palette, including alpha. 326 | When encoding a PNG, to store your colors in the palette of the LodePNGColorMode, first use 327 | lodepng_palette_clear, then for each color use lodepng_palette_add. 328 | If you encode an image without alpha with palette, don't forget to put value 255 in each A byte of the palette. 329 | 330 | When decoding, by default you can ignore this palette, since LodePNG already 331 | fills the palette colors in the pixels of the raw RGBA output. 332 | 333 | The palette is only supported for color type 3. 334 | */ 335 | unsigned char* palette; /*palette in RGBARGBA... order. When allocated, must be either 0, or have size 1024*/ 336 | size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/ 337 | 338 | /* 339 | transparent color key (tRNS) 340 | 341 | This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit. 342 | For greyscale PNGs, r, g and b will all 3 be set to the same. 343 | 344 | When decoding, by default you can ignore this information, since LodePNG sets 345 | pixels with this key to transparent already in the raw RGBA output. 346 | 347 | The color key is only supported for color types 0 and 2. 348 | */ 349 | unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/ 350 | unsigned key_r; /*red/greyscale component of color key*/ 351 | unsigned key_g; /*green component of color key*/ 352 | unsigned key_b; /*blue component of color key*/ 353 | } LodePNGColorMode; 354 | 355 | /*init, cleanup and copy functions to use with this struct*/ 356 | void lodepng_color_mode_init(LodePNGColorMode* info); 357 | void lodepng_color_mode_cleanup(LodePNGColorMode* info); 358 | /*return value is error code (0 means no error)*/ 359 | unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source); 360 | 361 | void lodepng_palette_clear(LodePNGColorMode* info); 362 | /*add 1 color to the palette*/ 363 | unsigned lodepng_palette_add(LodePNGColorMode* info, 364 | unsigned char r, unsigned char g, unsigned char b, unsigned char a); 365 | 366 | /*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/ 367 | unsigned lodepng_get_bpp(const LodePNGColorMode* info); 368 | /*get the amount of color channels used, based on colortype in the struct. 369 | If a palette is used, it counts as 1 channel.*/ 370 | unsigned lodepng_get_channels(const LodePNGColorMode* info); 371 | /*is it a greyscale type? (only colortype 0 or 4)*/ 372 | unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info); 373 | /*has it got an alpha channel? (only colortype 2 or 6)*/ 374 | unsigned lodepng_is_alpha_type(const LodePNGColorMode* info); 375 | /*has it got a palette? (only colortype 3)*/ 376 | unsigned lodepng_is_palette_type(const LodePNGColorMode* info); 377 | /*only returns true if there is a palette and there is a value in the palette with alpha < 255. 378 | Loops through the palette to check this.*/ 379 | unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info); 380 | /* 381 | Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image. 382 | Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels). 383 | Returns false if the image can only have opaque pixels. 384 | In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values, 385 | or if "key_defined" is true. 386 | */ 387 | unsigned lodepng_can_have_alpha(const LodePNGColorMode* info); 388 | /*Returns the byte size of a raw image buffer with given width, height and color mode*/ 389 | size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color); 390 | 391 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS 392 | /*The information of a Time chunk in PNG.*/ 393 | typedef struct LodePNGTime 394 | { 395 | unsigned year; /*2 bytes used (0-65535)*/ 396 | unsigned month; /*1-12*/ 397 | unsigned day; /*1-31*/ 398 | unsigned hour; /*0-23*/ 399 | unsigned minute; /*0-59*/ 400 | unsigned second; /*0-60 (to allow for leap seconds)*/ 401 | } LodePNGTime; 402 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ 403 | 404 | /*Information about the PNG image, except pixels, width and height.*/ 405 | typedef struct LodePNGInfo 406 | { 407 | /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/ 408 | unsigned compression_method;/*compression method of the original file. Always 0.*/ 409 | unsigned filter_method; /*filter method of the original file*/ 410 | unsigned interlace_method; /*interlace method of the original file*/ 411 | LodePNGColorMode color; /*color type and bits, palette and transparency of the PNG file*/ 412 | 413 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS 414 | /* 415 | suggested background color chunk (bKGD) 416 | This color uses the same color mode as the PNG (except alpha channel), which can be 1-bit to 16-bit. 417 | 418 | For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding 419 | the encoder writes the red one. For palette PNGs: When decoding, the RGB value 420 | will be stored, not a palette index. But when encoding, specify the index of 421 | the palette in background_r, the other two are then ignored. 422 | 423 | The decoder does not use this background color to edit the color of pixels. 424 | */ 425 | unsigned background_defined; /*is a suggested background color given?*/ 426 | unsigned background_r; /*red component of suggested background color*/ 427 | unsigned background_g; /*green component of suggested background color*/ 428 | unsigned background_b; /*blue component of suggested background color*/ 429 | 430 | /* 431 | non-international text chunks (tEXt and zTXt) 432 | 433 | The char** arrays each contain num strings. The actual messages are in 434 | text_strings, while text_keys are keywords that give a short description what 435 | the actual text represents, e.g. Title, Author, Description, or anything else. 436 | 437 | A keyword is minimum 1 character and maximum 79 characters long. It's 438 | discouraged to use a single line length longer than 79 characters for texts. 439 | 440 | Don't allocate these text buffers yourself. Use the init/cleanup functions 441 | correctly and use lodepng_add_text and lodepng_clear_text. 442 | */ 443 | size_t text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/ 444 | char** text_keys; /*the keyword of a text chunk (e.g. "Comment")*/ 445 | char** text_strings; /*the actual text*/ 446 | 447 | /* 448 | international text chunks (iTXt) 449 | Similar to the non-international text chunks, but with additional strings 450 | "langtags" and "transkeys". 451 | */ 452 | size_t itext_num; /*the amount of international texts in this PNG*/ 453 | char** itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/ 454 | char** itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/ 455 | char** itext_transkeys; /*keyword translated to the international language - UTF-8 string*/ 456 | char** itext_strings; /*the actual international text - UTF-8 string*/ 457 | 458 | /*time chunk (tIME)*/ 459 | unsigned time_defined; /*set to 1 to make the encoder generate a tIME chunk*/ 460 | LodePNGTime time; 461 | 462 | /*phys chunk (pHYs)*/ 463 | unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/ 464 | unsigned phys_x; /*pixels per unit in x direction*/ 465 | unsigned phys_y; /*pixels per unit in y direction*/ 466 | unsigned phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/ 467 | 468 | /* 469 | unknown chunks 470 | There are 3 buffers, one for each position in the PNG where unknown chunks can appear 471 | each buffer contains all unknown chunks for that position consecutively 472 | The 3 buffers are the unknown chunks between certain critical chunks: 473 | 0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND 474 | Do not allocate or traverse this data yourself. Use the chunk traversing functions declared 475 | later, such as lodepng_chunk_next and lodepng_chunk_append, to read/write this struct. 476 | */ 477 | unsigned char* unknown_chunks_data[3]; 478 | size_t unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/ 479 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ 480 | } LodePNGInfo; 481 | 482 | /*init, cleanup and copy functions to use with this struct*/ 483 | void lodepng_info_init(LodePNGInfo* info); 484 | void lodepng_info_cleanup(LodePNGInfo* info); 485 | /*return value is error code (0 means no error)*/ 486 | unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source); 487 | 488 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS 489 | void lodepng_clear_text(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/ 490 | unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str); /*push back both texts at once*/ 491 | 492 | void lodepng_clear_itext(LodePNGInfo* info); /*use this to clear the itexts again after you filled them in*/ 493 | unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag, 494 | const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/ 495 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ 496 | 497 | /* 498 | Converts raw buffer from one color type to another color type, based on 499 | LodePNGColorMode structs to describe the input and output color type. 500 | See the reference manual at the end of this header file to see which color conversions are supported. 501 | return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported) 502 | The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel 503 | of the output color type (lodepng_get_bpp). 504 | For < 8 bpp images, there should not be padding bits at the end of scanlines. 505 | For 16-bit per channel colors, uses big endian format like PNG does. 506 | Return value is LodePNG error code 507 | */ 508 | unsigned lodepng_convert(unsigned char* out, const unsigned char* in, 509 | LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, 510 | unsigned w, unsigned h); 511 | 512 | #ifdef LODEPNG_COMPILE_DECODER 513 | /* 514 | Settings for the decoder. This contains settings for the PNG and the Zlib 515 | decoder, but not the Info settings from the Info structs. 516 | */ 517 | typedef struct LodePNGDecoderSettings 518 | { 519 | LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ 520 | 521 | unsigned ignore_crc; /*ignore CRC checksums*/ 522 | 523 | unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ 524 | 525 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS 526 | unsigned read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/ 527 | /*store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)*/ 528 | unsigned remember_unknown_chunks; 529 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ 530 | } LodePNGDecoderSettings; 531 | 532 | void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings); 533 | #endif /*LODEPNG_COMPILE_DECODER*/ 534 | 535 | #ifdef LODEPNG_COMPILE_ENCODER 536 | /*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/ 537 | typedef enum LodePNGFilterStrategy 538 | { 539 | /*every filter at zero*/ 540 | LFS_ZERO, 541 | /*Use filter that gives minumum sum, as described in the official PNG filter heuristic.*/ 542 | LFS_MINSUM, 543 | /*Use the filter type that gives smallest Shannon entropy for this scanline. Depending 544 | on the image, this is better or worse than minsum.*/ 545 | LFS_ENTROPY, 546 | /* 547 | Brute-force-search PNG filters by compressing each filter for each scanline. 548 | Experimental, very slow, and only rarely gives better compression than MINSUM. 549 | */ 550 | LFS_BRUTE_FORCE, 551 | /*use predefined_filters buffer: you specify the filter type for each scanline*/ 552 | LFS_PREDEFINED 553 | } LodePNGFilterStrategy; 554 | 555 | /*Gives characteristics about the colors of the image, which helps decide which color model to use for encoding. 556 | Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/ 557 | typedef struct LodePNGColorProfile 558 | { 559 | unsigned colored; /*not greyscale*/ 560 | unsigned key; /*if true, image is not opaque. Only if true and alpha is false, color key is possible.*/ 561 | unsigned short key_r; /*these values are always in 16-bit bitdepth in the profile*/ 562 | unsigned short key_g; 563 | unsigned short key_b; 564 | unsigned alpha; /*alpha channel or alpha palette required*/ 565 | unsigned numcolors; /*amount of colors, up to 257. Not valid if bits == 16.*/ 566 | unsigned char palette[1024]; /*Remembers up to the first 256 RGBA colors, in no particular order*/ 567 | unsigned bits; /*bits per channel (not for palette). 1,2 or 4 for greyscale only. 16 if 16-bit per channel required.*/ 568 | } LodePNGColorProfile; 569 | 570 | void lodepng_color_profile_init(LodePNGColorProfile* profile); 571 | 572 | /*Get a LodePNGColorProfile of the image.*/ 573 | unsigned lodepng_get_color_profile(LodePNGColorProfile* profile, 574 | const unsigned char* image, unsigned w, unsigned h, 575 | const LodePNGColorMode* mode_in); 576 | /*The function LodePNG uses internally to decide the PNG color with auto_convert. 577 | Chooses an optimal color model, e.g. grey if only grey pixels, palette if < 256 colors, ...*/ 578 | unsigned lodepng_auto_choose_color(LodePNGColorMode* mode_out, 579 | const unsigned char* image, unsigned w, unsigned h, 580 | const LodePNGColorMode* mode_in); 581 | 582 | /*Settings for the encoder.*/ 583 | typedef struct LodePNGEncoderSettings 584 | { 585 | LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/ 586 | 587 | unsigned auto_convert; /*automatically choose output PNG color type. Default: true*/ 588 | 589 | /*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than 590 | 8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to 591 | completely follow the official PNG heuristic, filter_palette_zero must be true and 592 | filter_strategy must be LFS_MINSUM*/ 593 | unsigned filter_palette_zero; 594 | /*Which filter strategy to use when not using zeroes due to filter_palette_zero. 595 | Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/ 596 | LodePNGFilterStrategy filter_strategy; 597 | /*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with 598 | the same length as the amount of scanlines in the image, and each value must <= 5. You 599 | have to cleanup this buffer, LodePNG will never free it. Don't forget that filter_palette_zero 600 | must be set to 0 to ensure this is also used on palette or low bitdepth images.*/ 601 | const unsigned char* predefined_filters; 602 | 603 | /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette). 604 | If colortype is 3, PLTE is _always_ created.*/ 605 | unsigned force_palette; 606 | #ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS 607 | /*add LodePNG identifier and version as a text chunk, for debugging*/ 608 | unsigned add_id; 609 | /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/ 610 | unsigned text_compression; 611 | #endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ 612 | } LodePNGEncoderSettings; 613 | 614 | void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings); 615 | #endif /*LODEPNG_COMPILE_ENCODER*/ 616 | 617 | 618 | #if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) 619 | /*The settings, state and information for extended encoding and decoding.*/ 620 | typedef struct LodePNGState 621 | { 622 | #ifdef LODEPNG_COMPILE_DECODER 623 | LodePNGDecoderSettings decoder; /*the decoding settings*/ 624 | #endif /*LODEPNG_COMPILE_DECODER*/ 625 | #ifdef LODEPNG_COMPILE_ENCODER 626 | LodePNGEncoderSettings encoder; /*the encoding settings*/ 627 | #endif /*LODEPNG_COMPILE_ENCODER*/ 628 | LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/ 629 | LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/ 630 | unsigned error; 631 | #ifdef LODEPNG_COMPILE_CPP 632 | //For the lodepng::State subclass. 633 | virtual ~LodePNGState(){} 634 | #endif 635 | } LodePNGState; 636 | 637 | /*init, cleanup and copy functions to use with this struct*/ 638 | void lodepng_state_init(LodePNGState* state); 639 | void lodepng_state_cleanup(LodePNGState* state); 640 | void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source); 641 | #endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */ 642 | 643 | #ifdef LODEPNG_COMPILE_DECODER 644 | /* 645 | Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and 646 | getting much more information about the PNG image and color mode. 647 | */ 648 | unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, 649 | LodePNGState* state, 650 | const unsigned char* in, size_t insize); 651 | 652 | /* 653 | Read the PNG header, but not the actual data. This returns only the information 654 | that is in the header chunk of the PNG, such as width, height and color type. The 655 | information is placed in the info_png field of the LodePNGState. 656 | */ 657 | unsigned lodepng_inspect(unsigned* w, unsigned* h, 658 | LodePNGState* state, 659 | const unsigned char* in, size_t insize); 660 | #endif /*LODEPNG_COMPILE_DECODER*/ 661 | 662 | 663 | #ifdef LODEPNG_COMPILE_ENCODER 664 | /*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/ 665 | unsigned lodepng_encode(unsigned char** out, size_t* outsize, 666 | const unsigned char* image, unsigned w, unsigned h, 667 | LodePNGState* state); 668 | #endif /*LODEPNG_COMPILE_ENCODER*/ 669 | 670 | /* 671 | The lodepng_chunk functions are normally not needed, except to traverse the 672 | unknown chunks stored in the LodePNGInfo struct, or add new ones to it. 673 | It also allows traversing the chunks of an encoded PNG file yourself. 674 | 675 | PNG standard chunk naming conventions: 676 | First byte: uppercase = critical, lowercase = ancillary 677 | Second byte: uppercase = public, lowercase = private 678 | Third byte: must be uppercase 679 | Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy 680 | */ 681 | 682 | /* 683 | Gets the length of the data of the chunk. Total chunk length has 12 bytes more. 684 | There must be at least 4 bytes to read from. If the result value is too large, 685 | it may be corrupt data. 686 | */ 687 | unsigned lodepng_chunk_length(const unsigned char* chunk); 688 | 689 | /*puts the 4-byte type in null terminated string*/ 690 | void lodepng_chunk_type(char type[5], const unsigned char* chunk); 691 | 692 | /*check if the type is the given type*/ 693 | unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type); 694 | 695 | /*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/ 696 | unsigned char lodepng_chunk_ancillary(const unsigned char* chunk); 697 | 698 | /*0: public, 1: private (see PNG standard)*/ 699 | unsigned char lodepng_chunk_private(const unsigned char* chunk); 700 | 701 | /*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/ 702 | unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk); 703 | 704 | /*get pointer to the data of the chunk, where the input points to the header of the chunk*/ 705 | unsigned char* lodepng_chunk_data(unsigned char* chunk); 706 | const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk); 707 | 708 | /*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/ 709 | unsigned lodepng_chunk_check_crc(const unsigned char* chunk); 710 | 711 | /*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ 712 | void lodepng_chunk_generate_crc(unsigned char* chunk); 713 | 714 | /*iterate to next chunks. don't use on IEND chunk, as there is no next chunk then*/ 715 | unsigned char* lodepng_chunk_next(unsigned char* chunk); 716 | const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk); 717 | 718 | /* 719 | Appends chunk to the data in out. The given chunk should already have its chunk header. 720 | The out variable and outlength are updated to reflect the new reallocated buffer. 721 | Returns error code (0 if it went ok) 722 | */ 723 | unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk); 724 | 725 | /* 726 | Appends new chunk to out. The chunk to append is given by giving its length, type 727 | and data separately. The type is a 4-letter string. 728 | The out variable and outlength are updated to reflect the new reallocated buffer. 729 | Returne error code (0 if it went ok) 730 | */ 731 | unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, 732 | const char* type, const unsigned char* data); 733 | 734 | 735 | /*Calculate CRC32 of buffer*/ 736 | unsigned lodepng_crc32(const unsigned char* buf, size_t len); 737 | #endif /*LODEPNG_COMPILE_PNG*/ 738 | 739 | 740 | #ifdef LODEPNG_COMPILE_ZLIB 741 | /* 742 | This zlib part can be used independently to zlib compress and decompress a 743 | buffer. It cannot be used to create gzip files however, and it only supports the 744 | part of zlib that is required for PNG, it does not support dictionaries. 745 | */ 746 | 747 | #ifdef LODEPNG_COMPILE_DECODER 748 | /*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/ 749 | unsigned lodepng_inflate(unsigned char** out, size_t* outsize, 750 | const unsigned char* in, size_t insize, 751 | const LodePNGDecompressSettings* settings); 752 | 753 | /* 754 | Decompresses Zlib data. Reallocates the out buffer and appends the data. The 755 | data must be according to the zlib specification. 756 | Either, *out must be NULL and *outsize must be 0, or, *out must be a valid 757 | buffer and *outsize its size in bytes. out must be freed by user after usage. 758 | */ 759 | unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, 760 | const unsigned char* in, size_t insize, 761 | const LodePNGDecompressSettings* settings); 762 | #endif /*LODEPNG_COMPILE_DECODER*/ 763 | 764 | #ifdef LODEPNG_COMPILE_ENCODER 765 | /* 766 | Compresses data with Zlib. Reallocates the out buffer and appends the data. 767 | Zlib adds a small header and trailer around the deflate data. 768 | The data is output in the format of the zlib specification. 769 | Either, *out must be NULL and *outsize must be 0, or, *out must be a valid 770 | buffer and *outsize its size in bytes. out must be freed by user after usage. 771 | */ 772 | unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, 773 | const unsigned char* in, size_t insize, 774 | const LodePNGCompressSettings* settings); 775 | 776 | /* 777 | Find length-limited Huffman code for given frequencies. This function is in the 778 | public interface only for tests, it's used internally by lodepng_deflate. 779 | */ 780 | unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies, 781 | size_t numcodes, unsigned maxbitlen); 782 | 783 | /*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/ 784 | unsigned lodepng_deflate(unsigned char** out, size_t* outsize, 785 | const unsigned char* in, size_t insize, 786 | const LodePNGCompressSettings* settings); 787 | 788 | #endif /*LODEPNG_COMPILE_ENCODER*/ 789 | #endif /*LODEPNG_COMPILE_ZLIB*/ 790 | 791 | #ifdef LODEPNG_COMPILE_DISK 792 | /* 793 | Load a file from disk into buffer. The function allocates the out buffer, and 794 | after usage you should free it. 795 | out: output parameter, contains pointer to loaded buffer. 796 | outsize: output parameter, size of the allocated out buffer 797 | filename: the path to the file to load 798 | return value: error code (0 means ok) 799 | */ 800 | unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename); 801 | 802 | /* 803 | Save a file from buffer to disk. Warning, if it exists, this function overwrites 804 | the file without warning! 805 | buffer: the buffer to write 806 | buffersize: size of the buffer to write 807 | filename: the path to the file to save to 808 | return value: error code (0 means ok) 809 | */ 810 | unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename); 811 | #endif /*LODEPNG_COMPILE_DISK*/ 812 | 813 | #ifdef LODEPNG_COMPILE_CPP 814 | //The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers. 815 | namespace lodepng 816 | { 817 | #ifdef LODEPNG_COMPILE_PNG 818 | class State : public LodePNGState 819 | { 820 | public: 821 | State(); 822 | State(const State& other); 823 | virtual ~State(); 824 | State& operator=(const State& other); 825 | }; 826 | 827 | #ifdef LODEPNG_COMPILE_DECODER 828 | //Same as other lodepng::decode, but using a State for more settings and information. 829 | unsigned decode(std::vector& out, unsigned& w, unsigned& h, 830 | State& state, 831 | const unsigned char* in, size_t insize); 832 | unsigned decode(std::vector& out, unsigned& w, unsigned& h, 833 | State& state, 834 | const std::vector& in); 835 | #endif /*LODEPNG_COMPILE_DECODER*/ 836 | 837 | #ifdef LODEPNG_COMPILE_ENCODER 838 | //Same as other lodepng::encode, but using a State for more settings and information. 839 | unsigned encode(std::vector& out, 840 | const unsigned char* in, unsigned w, unsigned h, 841 | State& state); 842 | unsigned encode(std::vector& out, 843 | const std::vector& in, unsigned w, unsigned h, 844 | State& state); 845 | #endif /*LODEPNG_COMPILE_ENCODER*/ 846 | 847 | #ifdef LODEPNG_COMPILE_DISK 848 | /* 849 | Load a file from disk into an std::vector. If the vector is empty, then either 850 | the file doesn't exist or is an empty file. 851 | */ 852 | void load_file(std::vector& buffer, const std::string& filename); 853 | 854 | /* 855 | Save the binary data in an std::vector to a file on disk. The file is overwritten 856 | without warning. 857 | */ 858 | void save_file(const std::vector& buffer, const std::string& filename); 859 | #endif //LODEPNG_COMPILE_DISK 860 | #endif //LODEPNG_COMPILE_PNG 861 | 862 | #ifdef LODEPNG_COMPILE_ZLIB 863 | #ifdef LODEPNG_COMPILE_DECODER 864 | //Zlib-decompress an unsigned char buffer 865 | unsigned decompress(std::vector& out, const unsigned char* in, size_t insize, 866 | const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); 867 | 868 | //Zlib-decompress an std::vector 869 | unsigned decompress(std::vector& out, const std::vector& in, 870 | const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); 871 | #endif //LODEPNG_COMPILE_DECODER 872 | 873 | #ifdef LODEPNG_COMPILE_ENCODER 874 | //Zlib-compress an unsigned char buffer 875 | unsigned compress(std::vector& out, const unsigned char* in, size_t insize, 876 | const LodePNGCompressSettings& settings = lodepng_default_compress_settings); 877 | 878 | //Zlib-compress an std::vector 879 | unsigned compress(std::vector& out, const std::vector& in, 880 | const LodePNGCompressSettings& settings = lodepng_default_compress_settings); 881 | #endif //LODEPNG_COMPILE_ENCODER 882 | #endif //LODEPNG_COMPILE_ZLIB 883 | } //namespace lodepng 884 | #endif /*LODEPNG_COMPILE_CPP*/ 885 | 886 | /* 887 | TODO: 888 | [.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often 889 | [.] check compatibility with vareous compilers - done but needs to be redone for every newer version 890 | [X] converting color to 16-bit per channel types 891 | [ ] read all public PNG chunk types (but never let the color profile and gamma ones touch RGB values) 892 | [ ] make sure encoder generates no chunks with size > (2^31)-1 893 | [ ] partial decoding (stream processing) 894 | [X] let the "isFullyOpaque" function check color keys and transparent palettes too 895 | [X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl" 896 | [ ] don't stop decoding on errors like 69, 57, 58 (make warnings) 897 | [ ] make option to choose if the raw image with non multiple of 8 bits per scanline should have padding bits or not 898 | [ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes 899 | */ 900 | 901 | #endif /*LODEPNG_H inclusion guard*/ 902 | 903 | /* 904 | LodePNG Documentation 905 | --------------------- 906 | 907 | 0. table of contents 908 | -------------------- 909 | 910 | 1. about 911 | 1.1. supported features 912 | 1.2. features not supported 913 | 2. C and C++ version 914 | 3. security 915 | 4. decoding 916 | 5. encoding 917 | 6. color conversions 918 | 6.1. PNG color types 919 | 6.2. color conversions 920 | 6.3. padding bits 921 | 6.4. A note about 16-bits per channel and endianness 922 | 7. error values 923 | 8. chunks and PNG editing 924 | 9. compiler support 925 | 10. examples 926 | 10.1. decoder C++ example 927 | 10.2. decoder C example 928 | 11. changes 929 | 12. contact information 930 | 931 | 932 | 1. about 933 | -------- 934 | 935 | PNG is a file format to store raster images losslessly with good compression, 936 | supporting different color types and alpha channel. 937 | 938 | LodePNG is a PNG codec according to the Portable Network Graphics (PNG) 939 | Specification (Second Edition) - W3C Recommendation 10 November 2003. 940 | 941 | The specifications used are: 942 | 943 | *) Portable Network Graphics (PNG) Specification (Second Edition): 944 | http://www.w3.org/TR/2003/REC-PNG-20031110 945 | *) RFC 1950 ZLIB Compressed Data Format version 3.3: 946 | http://www.gzip.org/zlib/rfc-zlib.html 947 | *) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3: 948 | http://www.gzip.org/zlib/rfc-deflate.html 949 | 950 | The most recent version of LodePNG can currently be found at 951 | http://lodev.org/lodepng/ 952 | 953 | LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds 954 | extra functionality. 955 | 956 | LodePNG exists out of two files: 957 | -lodepng.h: the header file for both C and C++ 958 | -lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage 959 | 960 | If you want to start using LodePNG right away without reading this doc, get the 961 | examples from the LodePNG website to see how to use it in code, or check the 962 | smaller examples in chapter 13 here. 963 | 964 | LodePNG is simple but only supports the basic requirements. To achieve 965 | simplicity, the following design choices were made: There are no dependencies 966 | on any external library. There are functions to decode and encode a PNG with 967 | a single function call, and extended versions of these functions taking a 968 | LodePNGState struct allowing to specify or get more information. By default 969 | the colors of the raw image are always RGB or RGBA, no matter what color type 970 | the PNG file uses. To read and write files, there are simple functions to 971 | convert the files to/from buffers in memory. 972 | 973 | This all makes LodePNG suitable for loading textures in games, demos and small 974 | programs, ... It's less suitable for full fledged image editors, loading PNGs 975 | over network (it requires all the image data to be available before decoding can 976 | begin), life-critical systems, ... 977 | 978 | 1.1. supported features 979 | ----------------------- 980 | 981 | The following features are supported by the decoder: 982 | 983 | *) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image, 984 | or the same color type as the PNG 985 | *) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image 986 | *) Adam7 interlace and deinterlace for any color type 987 | *) loading the image from harddisk or decoding it from a buffer from other sources than harddisk 988 | *) support for alpha channels, including RGBA color model, translucent palettes and color keying 989 | *) zlib decompression (inflate) 990 | *) zlib compression (deflate) 991 | *) CRC32 and ADLER32 checksums 992 | *) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks. 993 | *) the following chunks are supported (generated/interpreted) by both encoder and decoder: 994 | IHDR: header information 995 | PLTE: color palette 996 | IDAT: pixel data 997 | IEND: the final chunk 998 | tRNS: transparency for palettized images 999 | tEXt: textual information 1000 | zTXt: compressed textual information 1001 | iTXt: international textual information 1002 | bKGD: suggested background color 1003 | pHYs: physical dimensions 1004 | tIME: modification time 1005 | 1006 | 1.2. features not supported 1007 | --------------------------- 1008 | 1009 | The following features are _not_ supported: 1010 | 1011 | *) some features needed to make a conformant PNG-Editor might be still missing. 1012 | *) partial loading/stream processing. All data must be available and is processed in one call. 1013 | *) The following public chunks are not supported but treated as unknown chunks by LodePNG 1014 | cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT 1015 | Some of these are not supported on purpose: LodePNG wants to provide the RGB values 1016 | stored in the pixels, not values modified by system dependent gamma or color models. 1017 | 1018 | 1019 | 2. C and C++ version 1020 | -------------------- 1021 | 1022 | The C version uses buffers allocated with alloc that you need to free() 1023 | yourself. You need to use init and cleanup functions for each struct whenever 1024 | using a struct from the C version to avoid exploits and memory leaks. 1025 | 1026 | The C++ version has extra functions with std::vectors in the interface and the 1027 | lodepng::State class which is a LodePNGState with constructor and destructor. 1028 | 1029 | These files work without modification for both C and C++ compilers because all 1030 | the additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers 1031 | ignore it, and the C code is made to compile both with strict ISO C90 and C++. 1032 | 1033 | To use the C++ version, you need to rename the source file to lodepng.cpp 1034 | (instead of lodepng.c), and compile it with a C++ compiler. 1035 | 1036 | To use the C version, you need to rename the source file to lodepng.c (instead 1037 | of lodepng.cpp), and compile it with a C compiler. 1038 | 1039 | 1040 | 3. Security 1041 | ----------- 1042 | 1043 | Even if carefully designed, it's always possible that LodePNG contains possible 1044 | exploits. If you discover one, please let me know, and it will be fixed. 1045 | 1046 | When using LodePNG, care has to be taken with the C version of LodePNG, as well 1047 | as the C-style structs when working with C++. The following conventions are used 1048 | for all C-style structs: 1049 | 1050 | -if a struct has a corresponding init function, always call the init function when making a new one 1051 | -if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks 1052 | -if a struct has a corresponding copy function, use the copy function instead of "=". 1053 | The destination must also be inited already. 1054 | 1055 | 1056 | 4. Decoding 1057 | ----------- 1058 | 1059 | Decoding converts a PNG compressed image to a raw pixel buffer. 1060 | 1061 | Most documentation on using the decoder is at its declarations in the header 1062 | above. For C, simple decoding can be done with functions such as 1063 | lodepng_decode32, and more advanced decoding can be done with the struct 1064 | LodePNGState and lodepng_decode. For C++, all decoding can be done with the 1065 | various lodepng::decode functions, and lodepng::State can be used for advanced 1066 | features. 1067 | 1068 | When using the LodePNGState, it uses the following fields for decoding: 1069 | *) LodePNGInfo info_png: it stores extra information about the PNG (the input) in here 1070 | *) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you want to get 1071 | *) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use 1072 | 1073 | LodePNGInfo info_png 1074 | -------------------- 1075 | 1076 | After decoding, this contains extra information of the PNG image, except the actual 1077 | pixels, width and height because these are already gotten directly from the decoder 1078 | functions. 1079 | 1080 | It contains for example the original color type of the PNG image, text comments, 1081 | suggested background color, etc... More details about the LodePNGInfo struct are 1082 | at its declaration documentation. 1083 | 1084 | LodePNGColorMode info_raw 1085 | ------------------------- 1086 | 1087 | When decoding, here you can specify which color type you want 1088 | the resulting raw image to be. If this is different from the colortype of the 1089 | PNG, then the decoder will automatically convert the result. This conversion 1090 | always works, except if you want it to convert a color PNG to greyscale or to 1091 | a palette with missing colors. 1092 | 1093 | By default, 32-bit color is used for the result. 1094 | 1095 | LodePNGDecoderSettings decoder 1096 | ------------------------------ 1097 | 1098 | The settings can be used to ignore the errors created by invalid CRC and Adler32 1099 | chunks, and to disable the decoding of tEXt chunks. 1100 | 1101 | There's also a setting color_convert, true by default. If false, no conversion 1102 | is done, the resulting data will be as it was in the PNG (after decompression) 1103 | and you'll have to puzzle the colors of the pixels together yourself using the 1104 | color type information in the LodePNGInfo. 1105 | 1106 | 1107 | 5. Encoding 1108 | ----------- 1109 | 1110 | Encoding converts a raw pixel buffer to a PNG compressed image. 1111 | 1112 | Most documentation on using the encoder is at its declarations in the header 1113 | above. For C, simple encoding can be done with functions such as 1114 | lodepng_encode32, and more advanced decoding can be done with the struct 1115 | LodePNGState and lodepng_encode. For C++, all encoding can be done with the 1116 | various lodepng::encode functions, and lodepng::State can be used for advanced 1117 | features. 1118 | 1119 | Like the decoder, the encoder can also give errors. However it gives less errors 1120 | since the encoder input is trusted, the decoder input (a PNG image that could 1121 | be forged by anyone) is not trusted. 1122 | 1123 | When using the LodePNGState, it uses the following fields for encoding: 1124 | *) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be. 1125 | *) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has 1126 | *) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use 1127 | 1128 | LodePNGInfo info_png 1129 | -------------------- 1130 | 1131 | When encoding, you use this the opposite way as when decoding: for encoding, 1132 | you fill in the values you want the PNG to have before encoding. By default it's 1133 | not needed to specify a color type for the PNG since it's automatically chosen, 1134 | but it's possible to choose it yourself given the right settings. 1135 | 1136 | The encoder will not always exactly match the LodePNGInfo struct you give, 1137 | it tries as close as possible. Some things are ignored by the encoder. The 1138 | encoder uses, for example, the following settings from it when applicable: 1139 | colortype and bitdepth, text chunks, time chunk, the color key, the palette, the 1140 | background color, the interlace method, unknown chunks, ... 1141 | 1142 | When encoding to a PNG with colortype 3, the encoder will generate a PLTE chunk. 1143 | If the palette contains any colors for which the alpha channel is not 255 (so 1144 | there are translucent colors in the palette), it'll add a tRNS chunk. 1145 | 1146 | LodePNGColorMode info_raw 1147 | ------------------------- 1148 | 1149 | You specify the color type of the raw image that you give to the input here, 1150 | including a possible transparent color key and palette you happen to be using in 1151 | your raw image data. 1152 | 1153 | By default, 32-bit color is assumed, meaning your input has to be in RGBA 1154 | format with 4 bytes (unsigned chars) per pixel. 1155 | 1156 | LodePNGEncoderSettings encoder 1157 | ------------------------------ 1158 | 1159 | The following settings are supported (some are in sub-structs): 1160 | *) auto_convert: when this option is enabled, the encoder will 1161 | automatically choose the smallest possible color mode (including color key) that 1162 | can encode the colors of all pixels without information loss. 1163 | *) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree, 1164 | 2 = dynamic huffman tree (best compression). Should be 2 for proper 1165 | compression. 1166 | *) use_lz77: whether or not to use LZ77 for compressed block types. Should be 1167 | true for proper compression. 1168 | *) windowsize: the window size used by the LZ77 encoder (1 - 32768). Has value 1169 | 2048 by default, but can be set to 32768 for better, but slow, compression. 1170 | *) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE 1171 | chunk if force_palette is true. This can used as suggested palette to convert 1172 | to by viewers that don't support more than 256 colors (if those still exist) 1173 | *) add_id: add text chunk "Encoder: LodePNG " to the image. 1174 | *) text_compression: default 1. If 1, it'll store texts as zTXt instead of tEXt chunks. 1175 | zTXt chunks use zlib compression on the text. This gives a smaller result on 1176 | large texts but a larger result on small texts (such as a single program name). 1177 | It's all tEXt or all zTXt though, there's no separate setting per text yet. 1178 | 1179 | 1180 | 6. color conversions 1181 | -------------------- 1182 | 1183 | An important thing to note about LodePNG, is that the color type of the PNG, and 1184 | the color type of the raw image, are completely independent. By default, when 1185 | you decode a PNG, you get the result as a raw image in the color type you want, 1186 | no matter whether the PNG was encoded with a palette, greyscale or RGBA color. 1187 | And if you encode an image, by default LodePNG will automatically choose the PNG 1188 | color type that gives good compression based on the values of colors and amount 1189 | of colors in the image. It can be configured to let you control it instead as 1190 | well, though. 1191 | 1192 | To be able to do this, LodePNG does conversions from one color mode to another. 1193 | It can convert from almost any color type to any other color type, except the 1194 | following conversions: RGB to greyscale is not supported, and converting to a 1195 | palette when the palette doesn't have a required color is not supported. This is 1196 | not supported on purpose: this is information loss which requires a color 1197 | reduction algorithm that is beyong the scope of a PNG encoder (yes, RGB to grey 1198 | is easy, but there are multiple ways if you want to give some channels more 1199 | weight). 1200 | 1201 | By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB 1202 | color, no matter what color type the PNG has. And by default when encoding, 1203 | LodePNG automatically picks the best color model for the output PNG, and expects 1204 | the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control 1205 | the color format of the images yourself, you can skip this chapter. 1206 | 1207 | 6.1. PNG color types 1208 | -------------------- 1209 | 1210 | A PNG image can have many color types, ranging from 1-bit color to 64-bit color, 1211 | as well as palettized color modes. After the zlib decompression and unfiltering 1212 | in the PNG image is done, the raw pixel data will have that color type and thus 1213 | a certain amount of bits per pixel. If you want the output raw image after 1214 | decoding to have another color type, a conversion is done by LodePNG. 1215 | 1216 | The PNG specification gives the following color types: 1217 | 1218 | 0: greyscale, bit depths 1, 2, 4, 8, 16 1219 | 2: RGB, bit depths 8 and 16 1220 | 3: palette, bit depths 1, 2, 4 and 8 1221 | 4: greyscale with alpha, bit depths 8 and 16 1222 | 6: RGBA, bit depths 8 and 16 1223 | 1224 | Bit depth is the amount of bits per pixel per color channel. So the total amount 1225 | of bits per pixel is: amount of channels * bitdepth. 1226 | 1227 | 6.2. color conversions 1228 | ---------------------- 1229 | 1230 | As explained in the sections about the encoder and decoder, you can specify 1231 | color types and bit depths in info_png and info_raw to change the default 1232 | behaviour. 1233 | 1234 | If, when decoding, you want the raw image to be something else than the default, 1235 | you need to set the color type and bit depth you want in the LodePNGColorMode, 1236 | or the parameters colortype and bitdepth of the simple decoding function. 1237 | 1238 | If, when encoding, you use another color type than the default in the raw input 1239 | image, you need to specify its color type and bit depth in the LodePNGColorMode 1240 | of the raw image, or use the parameters colortype and bitdepth of the simple 1241 | encoding function. 1242 | 1243 | If, when encoding, you don't want LodePNG to choose the output PNG color type 1244 | but control it yourself, you need to set auto_convert in the encoder settings 1245 | to false, and specify the color type you want in the LodePNGInfo of the 1246 | encoder (including palette: it can generate a palette if auto_convert is true, 1247 | otherwise not). 1248 | 1249 | If the input and output color type differ (whether user chosen or auto chosen), 1250 | LodePNG will do a color conversion, which follows the rules below, and may 1251 | sometimes result in an error. 1252 | 1253 | To avoid some confusion: 1254 | -the decoder converts from PNG to raw image 1255 | -the encoder converts from raw image to PNG 1256 | -the colortype and bitdepth in LodePNGColorMode info_raw, are those of the raw image 1257 | -the colortype and bitdepth in the color field of LodePNGInfo info_png, are those of the PNG 1258 | -when encoding, the color type in LodePNGInfo is ignored if auto_convert 1259 | is enabled, it is automatically generated instead 1260 | -when decoding, the color type in LodePNGInfo is set by the decoder to that of the original 1261 | PNG image, but it can be ignored since the raw image has the color type you requested instead 1262 | -if the color type of the LodePNGColorMode and PNG image aren't the same, a conversion 1263 | between the color types is done if the color types are supported. If it is not 1264 | supported, an error is returned. If the types are the same, no conversion is done. 1265 | -even though some conversions aren't supported, LodePNG supports loading PNGs from any 1266 | colortype and saving PNGs to any colortype, sometimes it just requires preparing 1267 | the raw image correctly before encoding. 1268 | -both encoder and decoder use the same color converter. 1269 | 1270 | Non supported color conversions: 1271 | -color to greyscale: no error is thrown, but the result will look ugly because 1272 | only the red channel is taken 1273 | -anything to palette when that palette does not have that color in it: in this 1274 | case an error is thrown 1275 | 1276 | Supported color conversions: 1277 | -anything to 8-bit RGB, 8-bit RGBA, 16-bit RGB, 16-bit RGBA 1278 | -any grey or grey+alpha, to grey or grey+alpha 1279 | -anything to a palette, as long as the palette has the requested colors in it 1280 | -removing alpha channel 1281 | -higher to smaller bitdepth, and vice versa 1282 | 1283 | If you want no color conversion to be done (e.g. for speed or control): 1284 | -In the encoder, you can make it save a PNG with any color type by giving the 1285 | raw color mode and LodePNGInfo the same color mode, and setting auto_convert to 1286 | false. 1287 | -In the decoder, you can make it store the pixel data in the same color type 1288 | as the PNG has, by setting the color_convert setting to false. Settings in 1289 | info_raw are then ignored. 1290 | 1291 | The function lodepng_convert does the color conversion. It is available in the 1292 | interface but normally isn't needed since the encoder and decoder already call 1293 | it. 1294 | 1295 | 6.3. padding bits 1296 | ----------------- 1297 | 1298 | In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines 1299 | have a bit amount that isn't a multiple of 8, then padding bits are used so that each 1300 | scanline starts at a fresh byte. But that is NOT true for the LodePNG raw input and output. 1301 | The raw input image you give to the encoder, and the raw output image you get from the decoder 1302 | will NOT have these padding bits, e.g. in the case of a 1-bit image with a width 1303 | of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte, 1304 | not the first bit of a new byte. 1305 | 1306 | 6.4. A note about 16-bits per channel and endianness 1307 | ---------------------------------------------------- 1308 | 1309 | LodePNG uses unsigned char arrays for 16-bit per channel colors too, just like 1310 | for any other color format. The 16-bit values are stored in big endian (most 1311 | significant byte first) in these arrays. This is the opposite order of the 1312 | little endian used by x86 CPU's. 1313 | 1314 | LodePNG always uses big endian because the PNG file format does so internally. 1315 | Conversions to other formats than PNG uses internally are not supported by 1316 | LodePNG on purpose, there are myriads of formats, including endianness of 16-bit 1317 | colors, the order in which you store R, G, B and A, and so on. Supporting and 1318 | converting to/from all that is outside the scope of LodePNG. 1319 | 1320 | This may mean that, depending on your use case, you may want to convert the big 1321 | endian output of LodePNG to little endian with a for loop. This is certainly not 1322 | always needed, many applications and libraries support big endian 16-bit colors 1323 | anyway, but it means you cannot simply cast the unsigned char* buffer to an 1324 | unsigned short* buffer on x86 CPUs. 1325 | 1326 | 1327 | 7. error values 1328 | --------------- 1329 | 1330 | All functions in LodePNG that return an error code, return 0 if everything went 1331 | OK, or a non-zero code if there was an error. 1332 | 1333 | The meaning of the LodePNG error values can be retrieved with the function 1334 | lodepng_error_text: given the numerical error code, it returns a description 1335 | of the error in English as a string. 1336 | 1337 | Check the implementation of lodepng_error_text to see the meaning of each code. 1338 | 1339 | 1340 | 8. chunks and PNG editing 1341 | ------------------------- 1342 | 1343 | If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG 1344 | editor that should follow the rules about handling of unknown chunks, or if your 1345 | program is able to read other types of chunks than the ones handled by LodePNG, 1346 | then that's possible with the chunk functions of LodePNG. 1347 | 1348 | A PNG chunk has the following layout: 1349 | 1350 | 4 bytes length 1351 | 4 bytes type name 1352 | length bytes data 1353 | 4 bytes CRC 1354 | 1355 | 8.1. iterating through chunks 1356 | ----------------------------- 1357 | 1358 | If you have a buffer containing the PNG image data, then the first chunk (the 1359 | IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the 1360 | signature of the PNG and are not part of a chunk. But if you start at byte 8 1361 | then you have a chunk, and can check the following things of it. 1362 | 1363 | NOTE: none of these functions check for memory buffer boundaries. To avoid 1364 | exploits, always make sure the buffer contains all the data of the chunks. 1365 | When using lodepng_chunk_next, make sure the returned value is within the 1366 | allocated memory. 1367 | 1368 | unsigned lodepng_chunk_length(const unsigned char* chunk): 1369 | 1370 | Get the length of the chunk's data. The total chunk length is this length + 12. 1371 | 1372 | void lodepng_chunk_type(char type[5], const unsigned char* chunk): 1373 | unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type): 1374 | 1375 | Get the type of the chunk or compare if it's a certain type 1376 | 1377 | unsigned char lodepng_chunk_critical(const unsigned char* chunk): 1378 | unsigned char lodepng_chunk_private(const unsigned char* chunk): 1379 | unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk): 1380 | 1381 | Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are). 1382 | Check if the chunk is private (public chunks are part of the standard, private ones not). 1383 | Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical 1384 | chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your 1385 | program doesn't handle that type of unknown chunk. 1386 | 1387 | unsigned char* lodepng_chunk_data(unsigned char* chunk): 1388 | const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk): 1389 | 1390 | Get a pointer to the start of the data of the chunk. 1391 | 1392 | unsigned lodepng_chunk_check_crc(const unsigned char* chunk): 1393 | void lodepng_chunk_generate_crc(unsigned char* chunk): 1394 | 1395 | Check if the crc is correct or generate a correct one. 1396 | 1397 | unsigned char* lodepng_chunk_next(unsigned char* chunk): 1398 | const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk): 1399 | 1400 | Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these 1401 | functions do no boundary checking of the allocated data whatsoever, so make sure there is enough 1402 | data available in the buffer to be able to go to the next chunk. 1403 | 1404 | unsigned lodepng_chunk_append(unsigned char** out, size_t* outlength, const unsigned char* chunk): 1405 | unsigned lodepng_chunk_create(unsigned char** out, size_t* outlength, unsigned length, 1406 | const char* type, const unsigned char* data): 1407 | 1408 | These functions are used to create new chunks that are appended to the data in *out that has 1409 | length *outlength. The append function appends an existing chunk to the new data. The create 1410 | function creates a new chunk with the given parameters and appends it. Type is the 4-letter 1411 | name of the chunk. 1412 | 1413 | 8.2. chunks in info_png 1414 | ----------------------- 1415 | 1416 | The LodePNGInfo struct contains fields with the unknown chunk in it. It has 3 1417 | buffers (each with size) to contain 3 types of unknown chunks: 1418 | the ones that come before the PLTE chunk, the ones that come between the PLTE 1419 | and the IDAT chunks, and the ones that come after the IDAT chunks. 1420 | It's necessary to make the distionction between these 3 cases because the PNG 1421 | standard forces to keep the ordering of unknown chunks compared to the critical 1422 | chunks, but does not force any other ordering rules. 1423 | 1424 | info_png.unknown_chunks_data[0] is the chunks before PLTE 1425 | info_png.unknown_chunks_data[1] is the chunks after PLTE, before IDAT 1426 | info_png.unknown_chunks_data[2] is the chunks after IDAT 1427 | 1428 | The chunks in these 3 buffers can be iterated through and read by using the same 1429 | way described in the previous subchapter. 1430 | 1431 | When using the decoder to decode a PNG, you can make it store all unknown chunks 1432 | if you set the option settings.remember_unknown_chunks to 1. By default, this 1433 | option is off (0). 1434 | 1435 | The encoder will always encode unknown chunks that are stored in the info_png. 1436 | If you need it to add a particular chunk that isn't known by LodePNG, you can 1437 | use lodepng_chunk_append or lodepng_chunk_create to the chunk data in 1438 | info_png.unknown_chunks_data[x]. 1439 | 1440 | Chunks that are known by LodePNG should not be added in that way. E.g. to make 1441 | LodePNG add a bKGD chunk, set background_defined to true and add the correct 1442 | parameters there instead. 1443 | 1444 | 1445 | 9. compiler support 1446 | ------------------- 1447 | 1448 | No libraries other than the current standard C library are needed to compile 1449 | LodePNG. For the C++ version, only the standard C++ library is needed on top. 1450 | Add the files lodepng.c(pp) and lodepng.h to your project, include 1451 | lodepng.h where needed, and your program can read/write PNG files. 1452 | 1453 | It is compatible with C90 and up, and C++03 and up. 1454 | 1455 | If performance is important, use optimization when compiling! For both the 1456 | encoder and decoder, this makes a large difference. 1457 | 1458 | Make sure that LodePNG is compiled with the same compiler of the same version 1459 | and with the same settings as the rest of the program, or the interfaces with 1460 | std::vectors and std::strings in C++ can be incompatible. 1461 | 1462 | CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets. 1463 | 1464 | *) gcc and g++ 1465 | 1466 | LodePNG is developed in gcc so this compiler is natively supported. It gives no 1467 | warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++ 1468 | version 4.7.1 on Linux, 32-bit and 64-bit. 1469 | 1470 | *) Clang 1471 | 1472 | Fully supported and warning-free. 1473 | 1474 | *) Mingw 1475 | 1476 | The Mingw compiler (a port of gcc for Windows) should be fully supported by 1477 | LodePNG. 1478 | 1479 | *) Visual Studio and Visual C++ Express Edition 1480 | 1481 | LodePNG should be warning-free with warning level W4. Two warnings were disabled 1482 | with pragmas though: warning 4244 about implicit conversions, and warning 4996 1483 | where it wants to use a non-standard function fopen_s instead of the standard C 1484 | fopen. 1485 | 1486 | Visual Studio may want "stdafx.h" files to be included in each source file and 1487 | give an error "unexpected end of file while looking for precompiled header". 1488 | This is not standard C++ and will not be added to the stock LodePNG. You can 1489 | disable it for lodepng.cpp only by right clicking it, Properties, C/C++, 1490 | Precompiled Headers, and set it to Not Using Precompiled Headers there. 1491 | 1492 | NOTE: Modern versions of VS should be fully supported, but old versions, e.g. 1493 | VS6, are not guaranteed to work. 1494 | 1495 | *) Compilers on Macintosh 1496 | 1497 | LodePNG has been reported to work both with gcc and LLVM for Macintosh, both for 1498 | C and C++. 1499 | 1500 | *) Other Compilers 1501 | 1502 | If you encounter problems on any compilers, feel free to let me know and I may 1503 | try to fix it if the compiler is modern and standards complient. 1504 | 1505 | 1506 | 10. examples 1507 | ------------ 1508 | 1509 | This decoder example shows the most basic usage of LodePNG. More complex 1510 | examples can be found on the LodePNG website. 1511 | 1512 | 10.1. decoder C++ example 1513 | ------------------------- 1514 | 1515 | #include "lodepng.h" 1516 | #include 1517 | 1518 | int main(int argc, char *argv[]) 1519 | { 1520 | const char* filename = argc > 1 ? argv[1] : "test.png"; 1521 | 1522 | //load and decode 1523 | std::vector image; 1524 | unsigned width, height; 1525 | unsigned error = lodepng::decode(image, width, height, filename); 1526 | 1527 | //if there's an error, display it 1528 | if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl; 1529 | 1530 | //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ... 1531 | } 1532 | 1533 | 10.2. decoder C example 1534 | ----------------------- 1535 | 1536 | #include "lodepng.h" 1537 | 1538 | int main(int argc, char *argv[]) 1539 | { 1540 | unsigned error; 1541 | unsigned char* image; 1542 | size_t width, height; 1543 | const char* filename = argc > 1 ? argv[1] : "test.png"; 1544 | 1545 | error = lodepng_decode32_file(&image, &width, &height, filename); 1546 | 1547 | if(error) printf("decoder error %u: %s\n", error, lodepng_error_text(error)); 1548 | 1549 | / * use image here * / 1550 | 1551 | free(image); 1552 | return 0; 1553 | } 1554 | 1555 | 1556 | 11. changes 1557 | ----------- 1558 | 1559 | The version number of LodePNG is the date of the change given in the format 1560 | yyyymmdd. 1561 | 1562 | Some changes aren't backwards compatible. Those are indicated with a (!) 1563 | symbol. 1564 | 1565 | *) 23 aug 2014: Reduced needless memory usage of decoder. 1566 | *) 28 jun 2014: Removed fix_png setting, always support palette OOB for 1567 | simplicity. Made ColorProfile public. 1568 | *) 09 jun 2014: Faster encoder by fixing hash bug and more zeros optimization. 1569 | *) 22 dec 2013: Power of two windowsize required for optimization. 1570 | *) 15 apr 2013: Fixed bug with LAC_ALPHA and color key. 1571 | *) 25 mar 2013: Added an optional feature to ignore some PNG errors (fix_png). 1572 | *) 11 mar 2013 (!): Bugfix with custom free. Changed from "my" to "lodepng_" 1573 | prefix for the custom allocators and made it possible with a new #define to 1574 | use custom ones in your project without needing to change lodepng's code. 1575 | *) 28 jan 2013: Bugfix with color key. 1576 | *) 27 okt 2012: Tweaks in text chunk keyword length error handling. 1577 | *) 8 okt 2012 (!): Added new filter strategy (entropy) and new auto color mode. 1578 | (no palette). Better deflate tree encoding. New compression tweak settings. 1579 | Faster color conversions while decoding. Some internal cleanups. 1580 | *) 23 sep 2012: Reduced warnings in Visual Studio a little bit. 1581 | *) 1 sep 2012 (!): Removed #define's for giving custom (de)compression functions 1582 | and made it work with function pointers instead. 1583 | *) 23 jun 2012: Added more filter strategies. Made it easier to use custom alloc 1584 | and free functions and toggle #defines from compiler flags. Small fixes. 1585 | *) 6 may 2012 (!): Made plugging in custom zlib/deflate functions more flexible. 1586 | *) 22 apr 2012 (!): Made interface more consistent, renaming a lot. Removed 1587 | redundant C++ codec classes. Reduced amount of structs. Everything changed, 1588 | but it is cleaner now imho and functionality remains the same. Also fixed 1589 | several bugs and shrinked the implementation code. Made new samples. 1590 | *) 6 nov 2011 (!): By default, the encoder now automatically chooses the best 1591 | PNG color model and bit depth, based on the amount and type of colors of the 1592 | raw image. For this, autoLeaveOutAlphaChannel replaced by auto_choose_color. 1593 | *) 9 okt 2011: simpler hash chain implementation for the encoder. 1594 | *) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching. 1595 | *) 23 aug 2011: tweaked the zlib compression parameters after benchmarking. 1596 | A bug with the PNG filtertype heuristic was fixed, so that it chooses much 1597 | better ones (it's quite significant). A setting to do an experimental, slow, 1598 | brute force search for PNG filter types is added. 1599 | *) 17 aug 2011 (!): changed some C zlib related function names. 1600 | *) 16 aug 2011: made the code less wide (max 120 characters per line). 1601 | *) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors. 1602 | *) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled. 1603 | *) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman 1604 | to optimize long sequences of zeros. 1605 | *) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and 1606 | LodePNG_InfoColor_canHaveAlpha functions for convenience. 1607 | *) 7 nov 2010: added LodePNG_error_text function to get error code description. 1608 | *) 30 okt 2010: made decoding slightly faster 1609 | *) 26 okt 2010: (!) changed some C function and struct names (more consistent). 1610 | Reorganized the documentation and the declaration order in the header. 1611 | *) 08 aug 2010: only changed some comments and external samples. 1612 | *) 05 jul 2010: fixed bug thanks to warnings in the new gcc version. 1613 | *) 14 mar 2010: fixed bug where too much memory was allocated for char buffers. 1614 | *) 02 sep 2008: fixed bug where it could create empty tree that linux apps could 1615 | read by ignoring the problem but windows apps couldn't. 1616 | *) 06 jun 2008: added more error checks for out of memory cases. 1617 | *) 26 apr 2008: added a few more checks here and there to ensure more safety. 1618 | *) 06 mar 2008: crash with encoding of strings fixed 1619 | *) 02 feb 2008: support for international text chunks added (iTXt) 1620 | *) 23 jan 2008: small cleanups, and #defines to divide code in sections 1621 | *) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor. 1622 | *) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder. 1623 | *) 17 jan 2008: ability to encode and decode compressed zTXt chunks added 1624 | Also vareous fixes, such as in the deflate and the padding bits code. 1625 | *) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved 1626 | filtering code of encoder. 1627 | *) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A 1628 | C++ wrapper around this provides an interface almost identical to before. 1629 | Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code 1630 | are together in these files but it works both for C and C++ compilers. 1631 | *) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks 1632 | *) 30 aug 2007: bug fixed which makes this Borland C++ compatible 1633 | *) 09 aug 2007: some VS2005 warnings removed again 1634 | *) 21 jul 2007: deflate code placed in new namespace separate from zlib code 1635 | *) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images 1636 | *) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing 1637 | invalid std::vector element [0] fixed, and level 3 and 4 warnings removed 1638 | *) 02 jun 2007: made the encoder add a tag with version by default 1639 | *) 27 may 2007: zlib and png code separated (but still in the same file), 1640 | simple encoder/decoder functions added for more simple usage cases 1641 | *) 19 may 2007: minor fixes, some code cleaning, new error added (error 69), 1642 | moved some examples from here to lodepng_examples.cpp 1643 | *) 12 may 2007: palette decoding bug fixed 1644 | *) 24 apr 2007: changed the license from BSD to the zlib license 1645 | *) 11 mar 2007: very simple addition: ability to encode bKGD chunks. 1646 | *) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding 1647 | palettized PNG images. Plus little interface change with palette and texts. 1648 | *) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes. 1649 | Fixed a bug where the end code of a block had length 0 in the Huffman tree. 1650 | *) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented 1651 | and supported by the encoder, resulting in smaller PNGs at the output. 1652 | *) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone. 1653 | *) 24 jan 2007: gave encoder an error interface. Added color conversion from any 1654 | greyscale type to 8-bit greyscale with or without alpha. 1655 | *) 21 jan 2007: (!) Totally changed the interface. It allows more color types 1656 | to convert to and is more uniform. See the manual for how it works now. 1657 | *) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days: 1658 | encode/decode custom tEXt chunks, separate classes for zlib & deflate, and 1659 | at last made the decoder give errors for incorrect Adler32 or Crc. 1660 | *) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel. 1661 | *) 29 dec 2006: Added support for encoding images without alpha channel, and 1662 | cleaned out code as well as making certain parts faster. 1663 | *) 28 dec 2006: Added "Settings" to the encoder. 1664 | *) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now. 1665 | Removed some code duplication in the decoder. Fixed little bug in an example. 1666 | *) 09 dec 2006: (!) Placed output parameters of public functions as first parameter. 1667 | Fixed a bug of the decoder with 16-bit per color. 1668 | *) 15 okt 2006: Changed documentation structure 1669 | *) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the 1670 | given image buffer, however for now it's not compressed. 1671 | *) 08 sep 2006: (!) Changed to interface with a Decoder class 1672 | *) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different 1673 | way. Renamed decodePNG to decodePNGGeneric. 1674 | *) 29 jul 2006: (!) Changed the interface: image info is now returned as a 1675 | struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy. 1676 | *) 28 jul 2006: Cleaned the code and added new error checks. 1677 | Corrected terminology "deflate" into "inflate". 1678 | *) 23 jun 2006: Added SDL example in the documentation in the header, this 1679 | example allows easy debugging by displaying the PNG and its transparency. 1680 | *) 22 jun 2006: (!) Changed way to obtain error value. Added 1681 | loadFile function for convenience. Made decodePNG32 faster. 1682 | *) 21 jun 2006: (!) Changed type of info vector to unsigned. 1683 | Changed position of palette in info vector. Fixed an important bug that 1684 | happened on PNGs with an uncompressed block. 1685 | *) 16 jun 2006: Internally changed unsigned into unsigned where 1686 | needed, and performed some optimizations. 1687 | *) 07 jun 2006: (!) Renamed functions to decodePNG and placed them 1688 | in LodePNG namespace. Changed the order of the parameters. Rewrote the 1689 | documentation in the header. Renamed files to lodepng.cpp and lodepng.h 1690 | *) 22 apr 2006: Optimized and improved some code 1691 | *) 07 sep 2005: (!) Changed to std::vector interface 1692 | *) 12 aug 2005: Initial release (C++, decoder only) 1693 | 1694 | 1695 | 12. contact information 1696 | ----------------------- 1697 | 1698 | Feel free to contact me with suggestions, problems, comments, ... concerning 1699 | LodePNG. If you encounter a PNG image that doesn't work properly with this 1700 | decoder, feel free to send it and I'll use it to find and fix the problem. 1701 | 1702 | My email address is (puzzle the account and domain together with an @ symbol): 1703 | Domain: gmail dot com. 1704 | Account: lode dot vandevenne. 1705 | 1706 | 1707 | Copyright (c) 2005-2014 Lode Vandevenne 1708 | */ 1709 | -------------------------------------------------------------------------------- /src/lib/sketchy/FSArray.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include "FSObject.h" 4 | #include "FSArray.h" 5 | 6 | FSArray *FSArray_alloc(int length) 7 | { 8 | FSArray *p = (FSArray *) malloc(sizeof(FSArray)); 9 | p->array = (void**) malloc(length*sizeof(void*)); 10 | p->cursor = 0; 11 | p->length = length; 12 | p->retainCount = 1; 13 | p->type = "Array"; 14 | return p; 15 | } 16 | 17 | int FSArray_count(FSArray *p){ 18 | return p->length; 19 | } 20 | 21 | void *FSArray_objectAtIndex(FSArray *p,int index){ 22 | return p->array[index]; 23 | } 24 | 25 | void FSArray_append(FSArray *p,void *elem){ 26 | FSObject_retain(elem); 27 | p->array[p->cursor] = elem; 28 | p->cursor ++; 29 | } 30 | 31 | void FSArray_release(FSArray *p){ 32 | int i = 0; 33 | for(i=0; i < p->length; i++){ 34 | void *elem = (void*)p->array[i]; 35 | FSObject_release(elem); 36 | } 37 | p->retainCount --; 38 | if(p->retainCount == 0){ 39 | free(p->array); 40 | free(p); 41 | } 42 | } 43 | 44 | void FSArray_retain(FSArray *p){ 45 | FSObject_retain(p); 46 | } 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | -------------------------------------------------------------------------------- /src/lib/sketchy/FSArray.h: -------------------------------------------------------------------------------- 1 | //class FSArray// 2 | 3 | #ifndef FSARRAY_H 4 | #define FSARRAY_H 5 | 6 | typedef struct FSArray{ 7 | int retainCount; 8 | char *type; 9 | int cursor; 10 | int length; 11 | void** array; 12 | }FSArray; 13 | 14 | FSArray *FSArray_alloc(int length); 15 | void FSArray_append(FSArray *p, void *elem); 16 | void FSArray_release(FSArray *p); 17 | void FSArray_retain(FSArray *p); 18 | int FSArray_count(FSArray *p); 19 | void *FSArray_objectAtIndex(FSArray *p,int index); 20 | 21 | #endif 22 | 23 | 24 | -------------------------------------------------------------------------------- /src/lib/sketchy/FSNumber.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include "FSObject.h" 5 | #include "FSNumber.h" 6 | 7 | FSNumber *FSNumber_allocWithInt(int intval){ 8 | FSNumber *n = (FSNumber *) malloc(sizeof(FSNumber)); 9 | n->intValue = intval; 10 | n->floatValue = (float)intval; 11 | n->retainCount = 1; 12 | n->type = "Number"; 13 | return n; 14 | } 15 | 16 | FSNumber *FSNumber_allocWithFloat(float floatval){ 17 | FSNumber *n = (FSNumber *) malloc(sizeof(FSNumber)); 18 | n->intValue = (int)round(floatval); 19 | n->floatValue = floatval; 20 | n->retainCount = 1; 21 | n->type = "Number"; 22 | return n; 23 | } 24 | 25 | void FSNumber_release(FSNumber *n){ 26 | FSObject_release(n); 27 | } 28 | 29 | void FSNumber_retain(FSNumber *n){ 30 | FSObject_retain(n); 31 | } 32 | 33 | 34 | 35 | 36 | 37 | 38 | -------------------------------------------------------------------------------- /src/lib/sketchy/FSNumber.h: -------------------------------------------------------------------------------- 1 | //class FSNumber// 2 | 3 | #ifndef FSNUMBER_H 4 | #define FSNUMBER_H 5 | 6 | typedef struct FSNumber{ 7 | int retainCount; 8 | char *type; 9 | float floatValue; 10 | float intValue; 11 | }FSNumber; 12 | 13 | FSNumber *FSNumber_allocWithInt(int intval); 14 | FSNumber *FSNumber_allocWithFloat(float floatval); 15 | void FSNumber_release(FSNumber *p); 16 | void FSNumber_retain(FSNumber *p); 17 | 18 | #endif 19 | 20 | 21 | -------------------------------------------------------------------------------- /src/lib/sketchy/FSObject.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include "FSObject.h" 4 | 5 | void FSObject_release(void *o){ 6 | FSObject *obj = (FSObject*)o; 7 | obj->retainCount --; 8 | if(obj->retainCount == 0){ 9 | free(obj); 10 | } 11 | } 12 | 13 | void FSObject_retain(void *o){ 14 | FSObject *obj = (FSObject*)o; 15 | obj->retainCount ++; 16 | } 17 | -------------------------------------------------------------------------------- /src/lib/sketchy/FSObject.h: -------------------------------------------------------------------------------- 1 | //class FSObject// 2 | 3 | #ifndef FSOBJECT_H 4 | #define FSOBJECT_H 5 | 6 | typedef struct FSObject{ 7 | int retainCount; 8 | char *type; 9 | }FSObject; 10 | 11 | void FSObject_release(void *o); 12 | void FSObject_retain(void *o); 13 | 14 | #endif 15 | 16 | 17 | -------------------------------------------------------------------------------- /src/lib/sketchy/Point.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include "Point.h" 5 | #include "FSObject.h" 6 | #include "FSArray.h" 7 | #include "FSNumber.h" 8 | 9 | Point *Point_alloc(float x, float y){ 10 | Point *p = (Point *) malloc(sizeof(Point)); 11 | p->x = x; 12 | p->y = y; 13 | p->retainCount = 1; 14 | p->type = "Point"; 15 | return p; 16 | } 17 | 18 | void Point_copy(Point *src,Point *dest){ 19 | dest->x = src->x; 20 | dest->y = src->y; 21 | dest->left_angle = src->left_angle; 22 | dest->right_angle = src->right_angle; 23 | dest->left_steps = src->left_steps; 24 | dest->right_steps = src->right_steps; 25 | } 26 | 27 | void Point_log(Point *p){ 28 | printf("Point <%p left:%i l-angle:%f right:%i r-angle:%f - x:%f y:%f >\n", 29 | p,p->left_steps,p->left_angle,p->right_steps,p->right_angle,p->x,p->y); 30 | } 31 | 32 | void Point_release(Point *p){ 33 | FSObject_release(p); 34 | } 35 | 36 | void Point_retain(Point *p){ 37 | FSObject_retain(p); 38 | } 39 | 40 | void Point_setNull(Point *p){ 41 | p->x = 0.0; 42 | p->y = 0.0; 43 | } 44 | 45 | 46 | 47 | -------------------------------------------------------------------------------- /src/lib/sketchy/Point.h: -------------------------------------------------------------------------------- 1 | //class Point// 2 | 3 | #ifndef POINT_H 4 | #define POINT_H 5 | 6 | typedef struct FSPoint{ 7 | int retainCount; 8 | char *type; 9 | float x; 10 | float y; 11 | float left_angle; 12 | float right_angle; 13 | int left_steps; 14 | int right_steps; 15 | }Point; 16 | 17 | Point *Point_alloc(float x, float y); 18 | 19 | Point *Point_allocWithXY(float x, float y); 20 | void Point_updateWithXY(Point *p,float x, float y); 21 | 22 | Point *Point_allocWithSteps(int left_steps, int right_steps); 23 | void Point_updateWithSteps(Point *p,int left_steps, int right_steps); 24 | 25 | void Point_copy(Point *src,Point *dest); 26 | void Point_release(Point *p); 27 | void Point_retain(Point *p); 28 | void Point_setNull(Point *p); 29 | void Point_log(Point *p); 30 | 31 | #endif 32 | 33 | 34 | -------------------------------------------------------------------------------- /src/lib/sketchy/SketchyImage.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | 6 | #include "FSObject.h" 7 | #include "Point.h" 8 | #include "bool.h" 9 | #include "SketchyImage.h" 10 | 11 | #include "../lodepng/lodepng.h" 12 | 13 | typedef enum{ 14 | lineDarknessModeAvg = 1, 15 | lineDarknessModeClear = 2 16 | }LineDarknessMode; 17 | 18 | int gCounter = 0; 19 | 20 | int SketchyImage_kernelValueByXY(SketchyImage *obj,int x, int y, bool clear,int kernelSize); 21 | 22 | SketchyImage *SketchyImage_allocWithFileName(const char *filename){ 23 | 24 | SketchyImage *obj = (SketchyImage *) malloc(sizeof(SketchyImage)); 25 | obj->retainCount = 1; 26 | obj->type = "SketchyImage"; 27 | obj->scaleFactor = 1.0; 28 | obj->xCorrection = 0.0; 29 | obj->yCorrection = 0.0; 30 | obj->xOffset = 0.0; 31 | obj->yOffset = 0.0; 32 | obj->brightness = 0; 33 | obj->outputBrightness = 0; 34 | obj->nibsize = 1; 35 | obj->avgBrightness = 255.0; 36 | 37 | unsigned error; 38 | unsigned char* image; 39 | unsigned width, height; 40 | 41 | error = lodepng_decode32_file(&image, &width, &height, filename); 42 | if(error){ 43 | printf("error %u: %s\n", error, lodepng_error_text(error)); 44 | } 45 | 46 | obj->width = width; 47 | obj->height = height; 48 | 49 | int numPixels = obj->width * obj->height; 50 | 51 | obj->imageData = (unsigned char*)calloc(numPixels , 1); 52 | obj->outputImageData = (unsigned char*)calloc(numPixels , 1); 53 | 54 | if(obj->imageData == NULL || obj->outputImageData == NULL){ 55 | printf("mem error\n"); 56 | } 57 | 58 | int i; 59 | int j; 60 | int numpix = width*height*4; 61 | for(i=0,j=0; ibrightness += pixelValue; 64 | obj->outputImageData[j] = 255; 65 | obj->imageData[j] = pixelValue; 66 | } 67 | obj->outputBrightness = width*height * 255; 68 | obj->avgBrightness = obj->brightness / (width*height); 69 | 70 | free(image); 71 | 72 | return obj; 73 | 74 | } 75 | 76 | int SketchyImage_getCanvasWidth(SketchyImage *obj){ 77 | return obj->width; 78 | } 79 | 80 | int SketchyImage_getCanvasHeight(SketchyImage *obj){ 81 | return obj->height; 82 | } 83 | 84 | void SketchyImage_setNibSize(SketchyImage *obj,int nibsize){ 85 | obj->nibsize = nibsize; 86 | } 87 | 88 | long int SketchyImage_getOutputBrightness(SketchyImage *obj){ 89 | return obj->outputBrightness; 90 | } 91 | 92 | long int SketchyImage_getBrightness(SketchyImage *obj){ 93 | return obj->brightness; 94 | } 95 | 96 | float SketchyImage_getAvgBrightness(SketchyImage *obj){ 97 | return obj->avgBrightness; 98 | } 99 | 100 | Point *SketchyImage_getDarkPixel(SketchyImage *obj){ 101 | int darkest = 255; 102 | int i = 0; 103 | int x = 0; 104 | int y = 0; 105 | int numPixels = obj->width * obj->height; 106 | for (i=0; iimageData[i]; 108 | if(pixelValue < darkest){ 109 | darkest = pixelValue; 110 | x = i%obj->width; 111 | y = floor(i/obj->width); 112 | } 113 | } 114 | return Point_alloc((float)x,(float)y); 115 | } 116 | 117 | void SketchyImage_release(SketchyImage *obj){ 118 | obj->retainCount --; 119 | if(obj->retainCount == 0){ 120 | free(obj->imageData); 121 | free(obj); 122 | } 123 | } 124 | 125 | void SketchyImage_retain(SketchyImage *obj){ 126 | FSObject_retain(obj); 127 | } 128 | 129 | // 130 | // helper method called by : 131 | // 1) SketchyImage_avgDarknessForLine returns the average darkness for pixels under a line 132 | // 2) SketchyImage_clearDarknessForLine clears the darkness for pixels under the line, returns 0 133 | // 134 | float SketchyImage_darknessHelperForLine(SketchyImage *obj, float x1, float y1, float x2, float y2,LineDarknessMode mode){ 135 | 136 | int kernelSize = obj->nibsize; 137 | if(kernelSize%2 == 0){ 138 | kernelSize = kernelSize - 1; 139 | } 140 | 141 | int xpol = (x1-x2) < 0; 142 | int ypol = (y1-y2) < 0; 143 | if(xpol == 0){ 144 | xpol = -1; 145 | } 146 | if(ypol == 0){ 147 | ypol = -1; 148 | } 149 | 150 | float xd = fabs(x1-x2); 151 | float yd = fabs(y1-y2); 152 | float slope = (x1-x2)/(y1-y2); 153 | float totaldarkness = 0; 154 | float avg; 155 | if(xd > yd){ 156 | int i; 157 | int cx = (int)x1; 158 | int cy = (int)y1; 159 | for(i=0;iscaleFactor; 201 | y = y * obj->scaleFactor; 202 | 203 | float degree_to_radian_fact = 0.0174532925; 204 | int n = 360; //full circle scan 205 | int i; 206 | float best = 9999.0; 207 | int bestX = 0; 208 | int bestY = 0; 209 | gCounter ++; 210 | for(i=gCounter; iwidth-1 && ry < obj->height-1 && rx > 0 && ry > 0){ 216 | float avg = SketchyImage_avgDarknessForLine(obj,x,y,rx,ry); 217 | if(avg < best){ 218 | best = avg; 219 | bestX = rx; 220 | bestY = ry; 221 | // if(avg < 100){ 222 | // break; 223 | // } 224 | } 225 | } 226 | 227 | } 228 | SketchyImage_clearDarknessForLine(obj,x,y,bestX,bestY); 229 | bestX = bestX/obj->scaleFactor; 230 | bestY = bestY/obj->scaleFactor; 231 | return Point_alloc((float)bestX,(float)bestY); 232 | 233 | } 234 | 235 | int pix(SketchyImage *obj,int pixelindex){ 236 | if(pixelindex < (obj->width * obj->height)){ 237 | return pixelindex; 238 | } 239 | return 0; 240 | } 241 | 242 | int SketchyImage_getPixel(SketchyImage *obj,int x, int y){ 243 | if (y < 0 || y > obj->height-1 || x < 0 || x > obj->width-1){ 244 | return 255; 245 | } 246 | int index = y * obj->width + x; 247 | return obj->imageData[pix(obj,index)]; 248 | } 249 | 250 | int SketchyImage_kernelValueByXY(SketchyImage *obj,int x, int y, bool clear,int kernelSize){ 251 | 252 | //the image data contains a 6 byte header 253 | //these are the threshold levels 254 | //this used to be fixed (36 spacing) 255 | //int levels[6] = {217, 180, 144, 108, 72, 36}; 256 | if (x > obj->width-1 || y > obj->height-1 || x < 0 || y < 0){ 257 | //out of bounds 258 | return -1; 259 | } 260 | int w = obj->width; 261 | int pixelindex = y*w + x; 262 | 263 | int pixelValue = obj->imageData[pixelindex]; 264 | if(kernelSize > 1){ 265 | int i; 266 | int limit = (kernelSize - 1) / 2.0; 267 | for(i=0;iimageData[pix(obj,pixelindex+1+i)]; 269 | pixelValue += obj->imageData[pix(obj,pixelindex+obj->width+(i*obj->width))]; 270 | pixelValue += obj->imageData[pix(obj,pixelindex-obj->width-(i*obj->width))]; 271 | pixelValue += obj->imageData[pix(obj,pixelindex-1-i)]; 272 | } 273 | } 274 | 275 | if(clear){ 276 | int index; 277 | if(kernelSize > 1){ 278 | int i; 279 | int limit = (kernelSize - 1) / 2.0; 280 | for(i=0;ibrightness += (255-obj->imageData[index]); 284 | obj->imageData[index] = 255; 285 | obj->outputBrightness -= obj->outputImageData[index]; 286 | obj->outputImageData[index] = 0; 287 | 288 | index = pix(obj,pixelindex+obj->width+(i*obj->width)); 289 | obj->brightness += (255-obj->imageData[index]); 290 | obj->imageData[index] = 255; 291 | obj->outputBrightness -= obj->outputImageData[index]; 292 | obj->outputImageData[index] = 0; 293 | 294 | index = pix(obj,pixelindex-obj->width-(i*obj->width)); 295 | obj->brightness += (255-obj->imageData[index]); 296 | obj->imageData[index] = 255; 297 | obj->outputBrightness -= obj->outputImageData[index]; 298 | obj->outputImageData[index] = 0; 299 | 300 | index = pix(obj,pixelindex-1-i); 301 | obj->brightness += (255-obj->imageData[index]); 302 | obj->imageData[index] = 255; 303 | obj->outputBrightness -= obj->outputImageData[index]; 304 | obj->outputImageData[index] = 0; 305 | 306 | } 307 | } 308 | index = pixelindex; 309 | obj->brightness += (255-obj->imageData[index]); 310 | obj->imageData[index] = 255; 311 | obj->outputBrightness -= obj->outputImageData[index]; 312 | obj->outputImageData[index] = 0; 313 | } 314 | 315 | return pixelValue; 316 | } 317 | 318 | void SketchyImage_saveStateAsPNG(SketchyImage *obj,const char *name){ 319 | unsigned char *imd = obj->imageData; 320 | unsigned error = lodepng_encode_file(name, imd,obj->width, obj->height,LCT_GREY,8); 321 | if(error) printf("error %u: %s\n", error, lodepng_error_text(error)); 322 | } 323 | 324 | void SketchyImage_saveAsPNG(SketchyImage *obj,const char *name){ 325 | unsigned char *imdo = obj->outputImageData; 326 | unsigned erroro = lodepng_encode_file(name, imdo,obj->width, obj->height,LCT_GREY,8); 327 | if(erroro) printf("error %u: %s\n", erroro, lodepng_error_text(erroro)); 328 | } 329 | 330 | 331 | 332 | 333 | -------------------------------------------------------------------------------- /src/lib/sketchy/SketchyImage.h: -------------------------------------------------------------------------------- 1 | #ifndef SKETCHYIMAGE_H 2 | #define SKETCHYIMAGE_H 3 | 4 | #include "bool.h" 5 | #include "Point.h" 6 | 7 | typedef struct SketchyImage{ 8 | int retainCount; 9 | char *type; 10 | unsigned char *imageData; 11 | unsigned char *outputImageData; 12 | float scaleFactor; 13 | float xCorrection; 14 | float yCorrection; 15 | float xOffset; 16 | float yOffset; 17 | long int brightness; 18 | long int outputBrightness; 19 | float avgBrightness; 20 | unsigned width; 21 | unsigned height; 22 | int nibsize; 23 | }SketchyImage; 24 | 25 | SketchyImage *SketchyImage_allocWithFileName(const char *filename); 26 | void SketchyImage_setNibSize(SketchyImage *obj,int nibsize); 27 | void SketchyImage_release(SketchyImage *obj); 28 | void SketchyImage_retain(SketchyImage *obj); 29 | void SketchyImage_saveAsPNG(SketchyImage *obj,const char *name); 30 | void SketchyImage_saveStateAsPNG(SketchyImage *obj,const char *name); 31 | float SketchyImage_avgDarknessForLine(SketchyImage *obj, float x1, float y1, float x2, float y2); 32 | Point *SketchyImage_bestPointOfNDestinationsFromXY2(SketchyImage *obj, int radius, int x, int y); 33 | long int SketchyImage_getBrightness(SketchyImage *obj); 34 | long int SketchyImage_getOutputBrightness(SketchyImage *obj); 35 | int SketchyImage_getCanvasWidth(SketchyImage *obj); 36 | int SketchyImage_getCanvasHeight(SketchyImage *obj); 37 | int SketchyImage_getPixel(SketchyImage *obj,int x, int y); 38 | Point *SketchyImage_getDarkPixel(SketchyImage *obj); 39 | float SketchyImage_getAvgBrightness(SketchyImage *obj); 40 | 41 | #endif 42 | -------------------------------------------------------------------------------- /src/lib/sketchy/bool.h: -------------------------------------------------------------------------------- 1 | #ifndef BOOL_H 2 | #define BOOL_H 3 | 4 | typedef enum { false, true } bool; 5 | 6 | #endif 7 | 8 | 9 | -------------------------------------------------------------------------------- /src/setup.py: -------------------------------------------------------------------------------- 1 | from distutils.core import setup, Extension 2 | 3 | module1 = Extension('blackstripes.sketchy', sources = 4 | ['blackstripes/sketchy.c', 5 | 'lib/lodepng/lodepng.c', 6 | 'lib/sketchy/SketchyImage.c', 7 | 'lib/sketchy/FSObject.c', 8 | 'lib/sketchy/Point.c', 9 | 'lib/sketchy/FSArray.c', 10 | 'lib/sketchy/FSNumber.c']) 11 | 12 | module2 = Extension('blackstripes.crossed', sources = 13 | ['blackstripes/crossed.c', 14 | 'lib/lodepng/lodepng.c', 15 | 'lib/sketchy/SketchyImage.c', 16 | 'lib/sketchy/FSObject.c', 17 | 'lib/sketchy/Point.c', 18 | 'lib/sketchy/FSArray.c', 19 | 'lib/sketchy/FSNumber.c']) 20 | 21 | module3 = Extension('blackstripes.spiral', sources = 22 | ['blackstripes/spiral.c', 23 | 'lib/lodepng/lodepng.c', 24 | 'lib/sketchy/SketchyImage.c', 25 | 'lib/sketchy/FSObject.c', 26 | 'lib/sketchy/Point.c', 27 | 'lib/sketchy/FSArray.c', 28 | 'lib/sketchy/FSNumber.c']) 29 | 30 | setup (name = 'blackstripes', 31 | version = '1.0', 32 | description = 'This is the blackstripes package', 33 | ext_modules = [module1, module2, module3], 34 | scripts=['cli/blackstripes'], 35 | packages=['blackstripes'], 36 | package_dir={'blackstripes': 'blackstripes'}, 37 | ) 38 | -------------------------------------------------------------------------------- /test/ali.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fullscreennl/blackstripes-python-extensions/366d3899b79daad5b6c5332a0ec63201374e46e4/test/ali.png -------------------------------------------------------------------------------- /test/crossed-test.py: -------------------------------------------------------------------------------- 1 | from blackstripes import crossed 2 | from blackstripes import sketchy 3 | from blackstripes import spiral 4 | from PIL import Image 5 | 6 | def levels_by_preview_name(name): 7 | return (100, 150, 200, 230) 8 | 9 | def crop_by_preview_name(name): 10 | return name 11 | 12 | def classic_small(image_path, path, color): 13 | 14 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 15 | selected_crop = crop_by_preview_name(image_path) 16 | 17 | im = Image.open(selected_crop) 18 | im = im.resize((500,500), Image.ANTIALIAS) 19 | im.save(selected_crop) 20 | 21 | crossed.draw(selected_crop, # input 22 | path, # output 23 | 3, # nibsize (line size in output svg) 24 | color, # line color 25 | 1.00, # scaling factor 26 | l1, l2, l3, l4, # levels 27 | 1, # type 28 | 380,500,0.2 # signature transform 29 | ) 30 | 31 | 32 | def sketchy_small(image_path, path, color): 33 | 34 | im = Image.open(image_path) 35 | im = im.resize((500,500), Image.ANTIALIAS) 36 | im.save(image_path) 37 | 38 | sketchy.draw(image_path, # input 39 | path, # output 40 | 2, # nibsize (line size in output svg) 41 | 100, # max line length 42 | color, # line color 43 | 1.00, # scaling factor 44 | 1, # line size (internal line size for calculations) 45 | 380,500,0.2 # signature transform 46 | ) 47 | 48 | 49 | def spiral_small(image_path, path, color): 50 | 51 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 52 | selected_crop = crop_by_preview_name(image_path) 53 | 54 | im = Image.open(selected_crop) 55 | im = im.resize((500,500), Image.ANTIALIAS) 56 | im.save(selected_crop) 57 | 58 | spiral.draw(selected_crop, # input 59 | path, # output 60 | 4, # nibsize (line size in output svg) 61 | color, # line color 62 | 1.00, # scaling factor 63 | l1, l2, l3, l4, # levels 64 | 3, # line spacing 65 | 380,500,0.2 # signature transform 66 | ) 67 | 68 | def classic_large(image_path, path, color): 69 | 70 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 71 | selected_crop = crop_by_preview_name(image_path) 72 | 73 | im = Image.open(selected_crop) 74 | im = im.resize((1000,1000), Image.ANTIALIAS) 75 | im.save(selected_crop) 76 | 77 | crossed.draw(selected_crop, # input 78 | path, # output 79 | 3, # nibsize (line size in output svg) 80 | color, # line color 81 | 1.06, # scaling factor 82 | l1, l2, l3, l4, # levels 83 | 1, # type 84 | 820,975,0.3 # signature transform 85 | ) 86 | 87 | 88 | def sketchy_large(image_path, path, color): 89 | 90 | im = Image.open(image_path) 91 | im = im.resize((1000,1000), Image.ANTIALIAS) 92 | im.save(image_path) 93 | 94 | sketchy.draw(image_path, # input 95 | path, # output 96 | 2, # nibsize (line size in output svg) 97 | 100, # max line length 98 | color, # line color 99 | 1.06, # scaling factor 100 | 1, # line size (internal line size for calculations) 101 | 820,975,0.3 # signature transform 102 | ) 103 | 104 | 105 | def spiral_large(image_path, path, color): 106 | 107 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 108 | selected_crop = crop_by_preview_name(image_path) 109 | 110 | im = Image.open(selected_crop) 111 | im = im.resize((1000,1000), Image.ANTIALIAS) 112 | im.save(selected_crop) 113 | 114 | spiral.draw(selected_crop, # input 115 | path, # output 116 | 4, # nibsize (line size in output svg) 117 | color, # line color 118 | 1.06, # scaling factor 119 | l1, l2, l3, l4, # levels 120 | 3, # line spacing 121 | 820,975,0.3 # signature transform 122 | ) 123 | 124 | 125 | def classic_extra_large(image_path, path, color): 126 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 127 | selected_crop = crop_by_preview_name(image_path) 128 | 129 | im = Image.open(selected_crop) 130 | im = im.resize((1000,1000), Image.ANTIALIAS) 131 | im.save(selected_crop) 132 | 133 | sig_scale = 1.0/1.39 134 | 135 | crossed.draw(selected_crop, # input 136 | path, # output 137 | 3, # nibsize (line size in output svg) 138 | color, # line color 139 | 1.39, # scaling factor 140 | l1, l2, l3, l4, # levels 141 | 2, # type 142 | 840, 975, 0.3 # signature transform 143 | ) 144 | 145 | 146 | def spiral_extra_large(image_path, path, color): 147 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 148 | selected_crop = crop_by_preview_name(image_path) 149 | 150 | im = Image.open(selected_crop) 151 | im = im.resize((1000,1000), Image.ANTIALIAS) 152 | im.save(selected_crop) 153 | 154 | sig_scale = 1.0/1.39 155 | 156 | spiral.draw(selected_crop, # input 157 | path, # output 158 | 3, # nibsize (line size in output svg) 159 | color, # line color 160 | 1.39, # scaling factor 161 | l1, l2, l3, l4, # levels 162 | 2, # line spacing 163 | 840, 975, 0.3 # signature transform 164 | ) 165 | 166 | 167 | def sketchy_extra_large(image_path, path, color): 168 | 169 | im = Image.open(image_path) 170 | im = im.resize((1390,1390), Image.ANTIALIAS) 171 | im.save(image_path) 172 | 173 | sig_scale = 1.0/1.39 174 | 175 | sketchy.draw(image_path, # input 176 | path, # output 177 | 2, # nibsize (line size in output svg) 178 | 100, # max line length 179 | color, # line color 180 | 1.00, # scaling factor 181 | 1, # line size (internal line size for calculations) 182 | 1225, 1370, 0.3 # signature transform 183 | ) 184 | 185 | def classic_pen_a3_portrait(image_path, path, color): 186 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 187 | selected_crop = crop_by_preview_name(image_path) 188 | 189 | im = Image.open(selected_crop) 190 | im = im.resize((668,1000), Image.ANTIALIAS) 191 | im.save(selected_crop) 192 | 193 | crossed.draw(selected_crop, # input 194 | path, # output 195 | 2, # nibsize (line size in output svg) 196 | color, # line color 197 | 0.32, # scaling factor 198 | l1, l2, l3, l4, # levels 199 | 2, # type 200 | 500,975, 0.3 # signature transform 201 | ) 202 | 203 | def classic_pen_a3_landscape(image_path, path, color): 204 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 205 | selected_crop = crop_by_preview_name(image_path) 206 | 207 | im = Image.open(selected_crop) 208 | im = im.resize((1000,572), Image.ANTIALIAS) 209 | im.save(selected_crop) 210 | 211 | crossed.draw(selected_crop, # input 212 | path, # output 213 | 2, # nibsize (line size in output svg) 214 | color, # line color 215 | 0.34, # scaling factor 216 | l1, l2, l3, l4, # levels 217 | 2, # type 218 | 830, 550, 0.3 # signature transform 219 | ) 220 | 221 | 222 | def spiral_pen_a3_portrait(image_path, path, color): 223 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 224 | selected_crop = crop_by_preview_name(image_path) 225 | 226 | im = Image.open(selected_crop) 227 | im = im.resize((668,1000), Image.ANTIALIAS) 228 | im.save(selected_crop) 229 | 230 | spiral.draw(selected_crop, # input 231 | path, # output 232 | 2, # nibsize (line size in output svg) 233 | color, # line color 234 | 0.32, # scaling factor 235 | l1, l2, l3, l4, # levels 236 | 2, # line spacing 237 | 500,975, 0.3 # signature transform 238 | ) 239 | 240 | def spiral_pen_a3_landscape(image_path, path, color): 241 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 242 | selected_crop = crop_by_preview_name(image_path) 243 | 244 | im = Image.open(selected_crop) 245 | im = im.resize((1000,572), Image.ANTIALIAS) 246 | im.save(selected_crop) 247 | 248 | spiral.draw(selected_crop, # input 249 | path, # output 250 | 2, # nibsize (line size in output svg) 251 | color, # line color 252 | 0.34, # scaling factor 253 | l1, l2, l3, l4, # levels 254 | 2, # line spacing 255 | 830, 550, 0.3 # signature transform 256 | ) 257 | 258 | 259 | def sketchy_pen_a3_portrait(image_path, path, color): 260 | 261 | im = Image.open(image_path) 262 | im = im.resize((668,1000), Image.ANTIALIAS) 263 | im.save(image_path) 264 | 265 | sketchy.draw(image_path, # input 266 | path, # outputsketchy_pen_a3 267 | 2, # nibsize (line size in output svg) 268 | 100, # max line length 269 | color, # line color 270 | 0.32, # scaling factor 271 | 1, # line size (internal line size for calculations) 272 | 500,975, 0.3 # signature transform 273 | ) 274 | 275 | def sketchy_pen_a3_landscape(image_path, path, color): 276 | 277 | im = Image.open(image_path) 278 | im = im.resize((1000,572), Image.ANTIALIAS) 279 | im.save(image_path) 280 | 281 | sketchy.draw(image_path, # input 282 | path, # outputsketchy_pen_a3 283 | 2, # nibsize (line size in output svg) 284 | 100, # max line length 285 | color, # line color 286 | 0.34, # scaling factor 287 | 1, # line size (internal line size for calculations) 288 | 830, 550, 0.3 # signature transform 289 | ) 290 | 291 | def classic_pen_a3(image_path, path, color): 292 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 293 | selected_crop = crop_by_preview_name(image_path) 294 | 295 | im = Image.open(selected_crop) 296 | im = im.resize((1000,1000), Image.ANTIALIAS) 297 | im.save(selected_crop) 298 | 299 | crossed.draw(selected_crop, # input 300 | path, # output 301 | 3, # nibsize (line size in output svg) 302 | color, # line color 303 | 0.21, # scaling factor 304 | l1, l2, l3, l4, # levels 305 | 1, # type 306 | 730,970,0.5 # signature transform 307 | ) 308 | 309 | 310 | def spiral_pen_a3(image_path, path, color): 311 | l1, l2, l3, l4 = levels_by_preview_name(image_path) 312 | selected_crop = crop_by_preview_name(image_path) 313 | 314 | im = Image.open(selected_crop) 315 | im = im.resize((1000,1000), Image.ANTIALIAS) 316 | im.save(selected_crop) 317 | 318 | spiral.draw(selected_crop, # input 319 | path, # output 320 | 3, # nibsize (line size in output svg) 321 | color, # line color 322 | 0.21, # scaling factor 323 | l1, l2, l3, l4, # levels 324 | 2, # line spacing 325 | 730,970,0.5 # signature transform 326 | ) 327 | 328 | 329 | def sketchy_pen_a3(image_path, path, color): 330 | 331 | im = Image.open(image_path) 332 | im = im.resize((1000,1000), Image.ANTIALIAS) 333 | im.save(image_path) 334 | 335 | sketchy.draw(image_path, # input 336 | path, # output 337 | 3, # nibsize (line size in output svg) 338 | 100, # max line length 339 | color, # line color 340 | 0.21, # scaling factor 341 | 1, # line size (internal line size for calculations) 342 | 730, 970, 0.5 # signature transform 343 | ) 344 | 345 | 346 | sketchy_pen_a3("image.png", "image1.svg", "#ff0000") 347 | spiral_pen_a3("image.png", "image2.svg", "#ff0000") 348 | classic_pen_a3("image.png", "image3.svg", "#ff0000") 349 | 350 | sketchy_pen_a3_landscape("image.png", "image4.svg", "#ff0000") 351 | spiral_pen_a3_landscape("image.png", "image5.svg", "#ff0000") 352 | classic_pen_a3_landscape("image.png", "image6.svg", "#ff0000") 353 | 354 | sketchy_pen_a3_portrait("image.png", "image7.svg", "#ff0000") 355 | spiral_pen_a3_portrait("image.png", "image8.svg", "#ff0000") 356 | classic_pen_a3_portrait("image.png", "image9.svg", "#ff0000") 357 | 358 | sketchy_extra_large("image.png", "image10.svg", "#ff00ff") 359 | spiral_extra_large("image.png", "image11.svg", "#ff00ff") 360 | classic_extra_large("image.png", "image12.svg", "#ff00ff") 361 | 362 | sketchy_large("image.png", "image13.svg", "#ff0000") 363 | spiral_large("image.png", "image14.svg", "#ff0000") 364 | classic_large("image.png", "image15.svg", "#ff0000") 365 | 366 | sketchy_small("image.png", "image16.svg", "#ffff00") 367 | spiral_small("image.png", "image17.svg", "#ffff00") 368 | classic_small("image.png", "image18.svg", "#ffff00") 369 | -------------------------------------------------------------------------------- /test/image.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/fullscreennl/blackstripes-python-extensions/366d3899b79daad5b6c5332a0ec63201374e46e4/test/image.png -------------------------------------------------------------------------------- /test/luxx_test.py: -------------------------------------------------------------------------------- 1 | from blackstripes import spiral 2 | from blackstripes import crossed 3 | 4 | crossed.draw("image.png", # input 5 | "image_crossed.svg", # output 6 | 2.0, # nibsize (line size in output svg) 7 | "#2200aa", # line color 8 | 0.32, # scaling factor 9 | 200, 0, 110, 0, # levels ** just null two invisible layers ** 10 | 2, # type 11 | 540,1021,0.0 # signature transform 12 | ) 13 | 14 | spiral.draw("image.png", # input 15 | "image_spiral.svg", # output 16 | 2.0 , # nibsize (line size in output svg) 17 | "#aa0000", # line color 18 | 0.32, # scaling factor 19 | 180, 108, 180, 108, # levels 20 | 2, # linespacing 21 | 540,1021,0.0 # signature transform 22 | ) 23 | 24 | spiral.draw("image.png", # input 25 | "image_spiral_round.svg", # output 26 | 2.0 , # nibsize (line size in output svg) 27 | "#aa0000", # line color 28 | 0.32, # scaling factor 29 | 180, 108, 180, 108, # levels 30 | 2, # linespacing 31 | 540,1021,0.0, # signature transform 32 | 1 # round shaped drawing if True 33 | ) 34 | -------------------------------------------------------------------------------- /test/sketchy-test.py: -------------------------------------------------------------------------------- 1 | from blackstripes import sketchy 2 | 3 | sketchy.draw("ali.png", # input 4 | "ali_sketchy.svg", # output 5 | 1, # nibsize (line size in output svg) 6 | 100, # max line length 7 | "#000000", # line color 8 | 0.32, # scaling factor 9 | 1, # line size (internal line size for calculations) 10 | 540, 1021, 0.7 # signature transform tx, ty, scale 11 | ) 12 | -------------------------------------------------------------------------------- /test/spiral-test.py: -------------------------------------------------------------------------------- 1 | from blackstripes import spiral 2 | 3 | spiral.draw("ali.png", # input 4 | "ali_spiral.svg", # output 5 | 2.0 , # nibsize (line size in output svg) 6 | "#aa0000", # line color 7 | 0.32, # scaling factor 8 | 180, 108, 180, 108, # levels 9 | 2, # linespacing 10 | 540,1021,0.7 # signature transform 11 | ) 12 | --------------------------------------------------------------------------------