├── LICENSE ├── readme.md └── src ├── c ├── linuxfb │ ├── examples │ │ ├── noise │ │ ├── noise.c │ │ ├── rgb │ │ └── rgb.c │ ├── readme.md │ └── zero.h ├── linuxgl │ ├── examples │ │ ├── Makefile │ │ ├── indexed │ │ ├── indexed.c │ │ ├── noise │ │ ├── noise.c │ │ ├── paint │ │ ├── paint.c │ │ ├── rgb │ │ └── rgb.c │ └── zero.h ├── linuxx11 │ ├── examples │ │ ├── Makefile │ │ ├── rgb │ │ └── rgb.c │ └── zero.h ├── png │ ├── examples │ │ ├── indexed.c │ │ ├── indexed.exe │ │ ├── indexed.png │ │ ├── make.bat │ │ ├── rgb.c │ │ ├── rgb.exe │ │ ├── rgb.png │ │ ├── rgba.c │ │ ├── rgba.exe │ │ └── rgba.png │ ├── stb_image_write.h │ └── zero.h ├── readme.md └── wingdi │ ├── examples │ ├── indexed.c │ ├── indexed.exe │ ├── make.bat │ ├── noise.c │ ├── noise.exe │ ├── rgb.c │ └── rgb.exe │ └── zero.h └── js └── canvas ├── examples ├── indexed.html ├── noise.html └── rgb.html └── zero.js /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2019 Diego F. Goberna 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 | -------------------------------------------------------------------------------- /readme.md: -------------------------------------------------------------------------------- 1 | # ZERO libraries 2 | 3 | Zero aims to be the solution to this common question... 4 | 5 | > "How can I simply put a pixel on the screen?" 6 | 7 | ...by gathering different implementations, depending on the platform, language 8 | or technology you want to use, using a common and extremely simple [API](https://github.com/feiss/zero#api). 9 | 10 | It can be used as a learning tool for children, a testbed to implement 11 | classic or new CG routines, experiment, make apps or games, for example. 12 | 13 | It is **deeply** inspired by the old Demoscene library **TinyPTC** by Gaffer. 14 | 15 | 16 | # Current implementations 17 | 18 | C | | status 19 | -----|-------------|------- 20 | [PNG](https://github.com/feiss/zero/tree/master/src/c/png) | Writes frames to PNG files | working 21 | [wingdi](https://github.com/feiss/zero/tree/master/src/c/wingdi) | Windows GDI | working 22 | wingl | Windows OpenGL | planned 23 | [linuxx11](https://github.com/feiss/zero/tree/master/src/c/linuxx11) | Linux X11 | working 24 | [linuxgl](https://github.com/feiss/zero/tree/master/src/c/linuxgl) | Linux OpenGL | working 25 | [linuxfb](https://github.com/feiss/zero/tree/master/src/c/linuxfb) | Linux Framebuffer | working 26 | 27 | Javascript | | status 28 | -----|-------------|------- 29 | [canvas](https://github.com/feiss/zero/tree/master/src/js/canvas) | HTML canvas | working 30 | WebGL | HTML WebGL | planned 31 | 32 | 33 | ## Contributions 34 | 35 | PRs are very very welcomed. It would be really great to convert this in a bible of how to put pixels in all architectures and languages, and that's something near impossible for a single person (at least for myself). 36 | 37 | Corrections and suggestions are very welcomed too. I'm not an expert in this field and I already assume I'm making lots of mistakes. 38 | 39 | Anybody trying to add an implementation should try to adhere to the [KISS](https://en.wikipedia.org/wiki/KISS_principle) principle. Specially, I'd like to: 40 | 41 | * Keep the external dependencies to a minimum, or none. The ideal usage of 42 | the library should be a single include. 43 | 44 | * Do not make it too generic, full of options and supporting many pixel formats. 45 | We are only targeting typical RGB(A) and Indexed color modes, 8 bits per component. 46 | 47 | 48 | 49 | ## API 50 | 51 | * `zero_open (target, width, height, depth, scale)` 52 | * `zero_update (framebuffer, palette)` 53 | * `zero_events(handler)` 54 | * `zero_close()` 55 | 56 | ### `zero_open (target, width, height, depth, scale)` 57 | 58 | Opens or initializes a window with specific properties. 59 | 60 | #### target 61 | Depending on the implementation used, `target` has different meanings. 62 | For example, in Javascript it means a DOM selector; 63 | in windows GDI it means the title of the window to create; 64 | in png means a file name, etc. 65 | 66 | #### width, height 67 | 68 | Dimensions of the image, in pixels. 69 | 70 | #### depth 71 | 72 | - **1** for indexed images (that need a palette) 73 | - **3** for RGB images 74 | - **4** for RGBA (not supported in all implementations) 75 | 76 | #### scale 77 | 78 | Multiplier of `width` and `height`, which affects the dimensions of the output (window, canvas, image file, ...). 79 | So if you set `scale` to 2, the window/canvas/image size will be the double of your frame size. 80 | 81 | 82 | 83 | ### `zero_update (framebuffer, palette)` 84 | 85 | Sends the frame data (and optional color palette) to the window. 86 | 87 | #### framebuffer 88 | 89 | Pointer to the image buffer. No checks are done about the format of the buffer content. 90 | 91 | #### palette 92 | 93 | If `depth` is set to **1**, a palette (array of R,G,B items) must be passed. 94 | Otherwise, this value is ignored. 95 | 96 | ### `zero_close ()` 97 | 98 | Closes the window, freeing resources. 99 | 100 | ### `zero_events(handler(type, param1, param2) )` 101 | 102 | Registers a function callback that will be called whenever an event occur. The `handler` must be a function that takes 3 parameters: 103 | 104 | * `type` a number with the event type code. See next table for a reference of the constant codes you can use. 105 | * `param1` and `param2` are two numeric parameters which meaning depends on the even type: 106 | 107 | type code | param1 meaning | param2 meaning 108 | ----------|----------|----------- 109 | RESIZE | new window width | height 110 | KEY_DOWN | key code | modifiers bitfield 111 | KEY_UP | key code | modifiers bitfield 112 | MOUSE_DOWN | button | modifiers bitfield 113 | MOUSE_UP | button | modifiers bitfield 114 | MOUSE_MOVE | x | y 115 | MOUSE_ENTER | none | none 116 | MOUSE_LEAVE | none | none 117 | 118 | 119 | # Examples 120 | 121 | They are mostly in pseudocode because it could be written in any of the languages supported by the library, just adapting it to the idiosyncrasies of the language. 122 | 123 | ### Noise 124 | 125 | This example produces an animated random noise. In pseudocode: 126 | 127 | ```pascal 128 | framebuffer = array of 320 x 200 x 4 bytes 129 | zero_open("Noise app", 320, 200, 4, 1) 130 | while True do: 131 | for i in framebuffer.length do: 132 | framebuffer[i] = random(0, 255) 133 | zero_update(framebuffer, NIL) 134 | ``` 135 | 136 | In C: 137 | 138 | ```c 139 | #include "zero.h" 140 | void main(){ 141 | unsigned char framebuffer[320 * 200 * 4]; 142 | zero_open("Noise app", 320, 200, 4, 1); 143 | while(1){ 144 | for (int i = 0; i < 320 * 200 * 4; i++){ 145 | framebuffer[i] = rand() % 255; 146 | } 147 | zero_update(framebuffer, NULL); 148 | } 149 | } 150 | 151 | ``` 152 | 153 | 154 | ### Drawing 155 | This is a basic pseudocode example of a whole functional drawing program in a 500x500 window/canvas for drawing with mouse, and quits with any key: 156 | 157 | ```pascal 158 | run = true 159 | drawing = false 160 | framebuffer = array of 500 x 500 x 4 bytes 161 | 162 | function PROCESS_EVENTS(event_type, param1, param2) 163 | case of event_type is: 164 | KEY_DOWN: run = false 165 | MOUSE_DOWN: drawing = true 166 | MOUSE_UP: drawing = false 167 | MOUSE_MOVE: if drawing is true then: 168 | idx = (param2 * 500 + param1) * 4 // get position in framebuffer 169 | framebuffer[idx] = 255 // paint pixel with red 170 | 171 | 172 | function MAIN 173 | zero_open("Drawing program", 500, 500, 4, 1) 174 | zero_events(PROCESS_EVENTS) 175 | while run is true do: 176 | zero_update(framebuffer, NIL) 177 | zero_close() 178 | ``` 179 | (you can check out the [Linux OpenGL implementation](https://github.com/feiss/zero/blob/master/src/c/linuxgl/examples/paint.c)) 180 | -------------------------------------------------------------------------------- /src/c/linuxfb/examples/noise: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/linuxfb/examples/noise -------------------------------------------------------------------------------- /src/c/linuxfb/examples/noise.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | void main(){ 4 | int w, h, d, line; 5 | zero_open(NULL, &w, &h, &d, 1, &line); 6 | 7 | char *fb = (char *)malloc(w * h * d); 8 | char *p=fb; 9 | 10 | int frames = 60*3; 11 | while(frames--){ 12 | for (int i = 0; i < w * h * 4; i++){ 13 | fb[i] = rand() % 255; 14 | } 15 | zero_update(fb, NULL); 16 | } 17 | free(fb); 18 | zero_close(); 19 | } -------------------------------------------------------------------------------- /src/c/linuxfb/examples/rgb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/linuxfb/examples/rgb -------------------------------------------------------------------------------- /src/c/linuxfb/examples/rgb.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | void main(void) { 4 | int w, h, d, line; 5 | zero_open(NULL, &w, &h, &d, 1, &line); 6 | 7 | char *fb = (char *)malloc(w * h * d); 8 | char *p=fb; 9 | 10 | for(int y = 0; y < h; y++) { 11 | for(int x = 0; x < w; x++) { 12 | p[0] = (int)(((float)x/w)*255.f); 13 | p[1] = (int)(((float)y/h)*255.f); 14 | p[2] = 0; 15 | p += d; 16 | } 17 | } 18 | 19 | // 3 secs, assuming fbdev being 60fps 20 | int loop = 60 * 3; 21 | while(--loop) { 22 | zero_update(fb, NULL); 23 | } 24 | 25 | free(fb); 26 | zero_close(); 27 | 28 | printf ("%ix%i, %i Bytes per pixel, line length: %i\n", w, h, d, line); 29 | } 30 | 31 | -------------------------------------------------------------------------------- /src/c/linuxfb/readme.md: -------------------------------------------------------------------------------- 1 | ## Linux framebuffer 2 | 3 | ``` 4 | void zero_open(char *device, int *w, int *h, int *d, int s, int *line); 5 | int zero_update(void *fb, void *pal); 6 | void zero_close(void); 7 | ``` 8 | 9 | Since the terminal framebuffer has a fixed resolution (the whole screen), 10 | parameters to `zero_open` are of output type: instead of asking for a specific 11 | resolution, the function returns current terminal framebuffer resolution and depth. 12 | 13 | It adds an extra output parameter `line`, which is the number of bytes you have 14 | to jump from one row to the next one (`width * depth` doesn't work here). See the *rgb* as an example of this. -------------------------------------------------------------------------------- /src/c/linuxfb/zero.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | void zero_open(char *device, int *w, int *h, int *d, int s, int *line); 4 | int zero_update(void *fb, void *pal); 5 | void zero_close(void); 6 | 7 | #define MAKE_RGB(r,g,b) (((b)<<16) | ((g)<<8) | (r)) 8 | 9 | // implementation 10 | // from https://stackoverflow.com/questions/4996777/paint-pixels-to-screen-via-linux-framebuffer?noredirect=1 11 | 12 | #include 13 | #include 14 | #include 15 | #include 16 | #include 17 | #include 18 | #include 19 | 20 | static int width, height, depth, scale; 21 | //static void *active_palette; 22 | static int fbfd = 0; 23 | static long int screensize = 0; 24 | static char *fbp = 0; 25 | static struct fb_var_screeninfo vinfo; 26 | static struct fb_fix_screeninfo finfo; 27 | 28 | 29 | void zero_open(char *device, int *w, int *h, int *d, int s, int *line) { 30 | 31 | fbfd = open(device ? device : "/dev/fb0", O_RDWR); 32 | if (fbfd == -1) { perror("Error: cannot open framebuffer device"); exit(1); } 33 | 34 | if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) { 35 | perror("Error reading fixed information"); 36 | exit(2); 37 | } 38 | 39 | if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) { 40 | perror("Error reading variable information"); 41 | exit(3); 42 | } 43 | 44 | width = *w = vinfo.xres_virtual; 45 | height = *h = vinfo.yres_virtual; 46 | depth = *d = vinfo.bits_per_pixel / 8; 47 | *line = finfo.line_length; 48 | scale = s <= 0 ? 1 : s; 49 | 50 | screensize = width * height * vinfo.bits_per_pixel / 8; 51 | 52 | fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0); 53 | if (fbp == MAP_FAILED) { 54 | perror("Error: failed to map framebuffer device to memory"); 55 | exit(4); 56 | } 57 | } 58 | 59 | 60 | int zero_update(void *fb, void *pal) { 61 | char *userfb = (char *)fb; 62 | char *fbpointer = 63 | fbp + vinfo.xoffset * (vinfo.bits_per_pixel / 8) + vinfo.yoffset * finfo.line_length; 64 | 65 | for (int i = 0; i < width * height * 4; i += 4) { 66 | *(fbpointer + i + 0) = *(userfb + i + 2); // blue 67 | *(fbpointer + i + 1) = *(userfb + i + 1); // green 68 | *(fbpointer + i + 2) = *(userfb + i + 0); // red 69 | *(fbpointer + i + 3) = 0; // no transparency 70 | } 71 | return 1; 72 | } 73 | 74 | void zero_close(void){ 75 | munmap(fbp, screensize); 76 | close(fbfd); 77 | } 78 | -------------------------------------------------------------------------------- /src/c/linuxgl/examples/Makefile: -------------------------------------------------------------------------------- 1 | CC=gcc 2 | DEPS=../zero.h 3 | LIBS=-lglfw -lGL -lGLEW 4 | 5 | %.o: %.c $(DEPS) 6 | $(CC) -c -o $@ $< $(CFLAGS) 7 | 8 | rgb: rgb.o 9 | $(CC) -orgb rgb.o $(LIBS) 10 | rm *.o 11 | -------------------------------------------------------------------------------- /src/c/linuxgl/examples/indexed: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/linuxgl/examples/indexed -------------------------------------------------------------------------------- /src/c/linuxgl/examples/indexed.c: -------------------------------------------------------------------------------- 1 | #define FPS_COUNTER 2 | #include "../zero.h" 3 | 4 | void main(void) { 5 | unsigned char fb [256 * 256]; 6 | unsigned char pal[256 * 3]; 7 | 8 | for(int i = 0; i < 256; i++){ 9 | pal[i * 3 + 0] = i / 2 + 128; 10 | pal[i * 3 + 1] = i / 2; 11 | pal[i * 3 + 2] = 255 - i; 12 | } 13 | 14 | for(int y = 0; y < 256; y++) { 15 | for(int x = 0; x < 256; x++) { 16 | fb[y * 256 + x] = y|x; 17 | } 18 | } 19 | 20 | zero_open("Zero linuxgl - Indexed example", 256, 256, 1, 1); 21 | zero_update(fb, pal); 22 | 23 | unsigned char r, g, b; 24 | int frame = 60 * 2; 25 | while(frame-- > 0) { 26 | r = pal[0]; 27 | g = pal[1]; 28 | b = pal[2]; 29 | for(int i = 0; i < 255 * 3; i++){ 30 | pal[i] = pal[i + 3]; 31 | } 32 | pal[255 * 3 + 0] = r; 33 | pal[255 * 3 + 1] = g; 34 | pal[255 * 3 + 2] = b; 35 | zero_update(fb, pal); 36 | } 37 | } 38 | 39 | -------------------------------------------------------------------------------- /src/c/linuxgl/examples/noise: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/linuxgl/examples/noise -------------------------------------------------------------------------------- /src/c/linuxgl/examples/noise.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | void main(){ 4 | unsigned char framebuffer[320 * 200 * 4]; 5 | zero_open("Noise app", 320, 200, 4, 2); 6 | int frames = 200; 7 | while(frames--){ 8 | for (int i = 0; i < 320 * 200 * 4; i++){ 9 | framebuffer[i] = rand() % 255; 10 | } 11 | zero_update(framebuffer, NULL); 12 | } 13 | } -------------------------------------------------------------------------------- /src/c/linuxgl/examples/paint: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/linuxgl/examples/paint -------------------------------------------------------------------------------- /src/c/linuxgl/examples/paint.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | static int run = 1; 4 | static int drawing = 0; 5 | 6 | int fb[256 * 256]; 7 | 8 | void event_handler(int type, int param1, int param2) { 9 | switch (type) { 10 | case MOUSE_DOWN: drawing = 1; break; 11 | case MOUSE_UP: drawing = 0; break; 12 | case KEY_DOWN: run = 0; break; 13 | case MOUSE_MOVE: 14 | if (drawing) fb[param2 * 256 + param1] = 0xFFFFFFFF; 15 | break; 16 | } 17 | } 18 | 19 | int main (int argc, char **argv){ 20 | 21 | zero_open("Zero linuxgl - Paint example", 256, 256, 4, 1); 22 | zero_events(event_handler); 23 | 24 | while(run){ 25 | zero_update(fb, NULL); 26 | } 27 | 28 | return 0; 29 | } -------------------------------------------------------------------------------- /src/c/linuxgl/examples/rgb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/linuxgl/examples/rgb -------------------------------------------------------------------------------- /src/c/linuxgl/examples/rgb.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | static int run = 1; 4 | 5 | void event_handler(int type, int param1, int param2) { 6 | switch (type) { 7 | case MOUSE_UP: run = 0; break; 8 | } 9 | printf("event %i (%i, %i)\n", type, param1, param2); 10 | } 11 | 12 | int main (int argc, char **argv){ 13 | int fb[256 * 256]; 14 | int *p = fb; 15 | 16 | for(int y = 0; y < 256; y++) { 17 | for(int x = 0; x < 256; x++) { 18 | unsigned char c = (y+x)%2 == 0 ? 0 : 1; 19 | *p = MAKE_RGB(y * c, x * c, 255 - x); 20 | p++; 21 | } 22 | } 23 | 24 | 25 | zero_open("Zero linuxgl - rgb example", 256, 256, 4, 2); 26 | zero_events(event_handler); 27 | 28 | while(run){ 29 | zero_update(fb, NULL); 30 | } 31 | 32 | return 0; 33 | } -------------------------------------------------------------------------------- /src/c/linuxgl/zero.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #define GLEW_STATIC 3 | #include 4 | #include 5 | #include 6 | 7 | GLFWwindow *zero_open(char *title, int w, int h, int d, int s); 8 | int zero_update(void *fb, void *pal); 9 | void zero_close() {}; 10 | 11 | typedef void(*Zero_Handler_Func)(int type, int param1, int param2); 12 | void zero_events(Zero_Handler_Func handler); 13 | 14 | #define MAKE_RGB(r,g,b) (((r)<<16) | ((g)<<8) | (b)) 15 | 16 | enum { 17 | RESIZE = 1, 18 | KEY_DOWN, 19 | KEY_UP, 20 | MOUSE_DOWN, 21 | MOUSE_UP, 22 | MOUSE_MOVE, 23 | MOUSE_ENTER, 24 | MOUSE_LEAVE 25 | } Zero_Event_Types; 26 | 27 | enum { 28 | SHIFT = 1, 29 | CONTROL = 2, 30 | ALT = 4, 31 | SUPER = 8 32 | } Zero_Key_Modifier; 33 | 34 | enum { 35 | MOUSE_LEFT = 0, 36 | MOUSE_RIGHT, 37 | MOUSE_MIDDLE 38 | } Zero_Mouse_Button; 39 | 40 | 41 | // implementation 42 | 43 | 44 | static GLuint fb_texture, pal_texture; 45 | static GLFWwindow *window; 46 | static int width, height, depth, scale; 47 | static GLuint vertexbuffer; 48 | static GLuint shaderProgram; 49 | static Zero_Handler_Func __event_handler; 50 | 51 | 52 | //static void *active_fb = 0; 53 | static void *active_pal = 0; 54 | 55 | GLuint initShaders() { 56 | GLuint vertex_id = glCreateShader(GL_VERTEX_SHADER); 57 | GLuint fragment_id = glCreateShader(GL_FRAGMENT_SHADER); 58 | 59 | const char* vertex_shader = 60 | "#version 400\n" 61 | "layout(location = 0) in vec2 inPos;" 62 | "void main() {" 63 | " gl_Position = vec4(inPos, 0.0, 1.0);" 64 | "}"; 65 | 66 | const char* fragment_shader = 67 | "#version 400\n" 68 | "uniform sampler2D texture;" 69 | "uniform vec2 size;" 70 | "out vec4 outColor;" 71 | "void main() {" 72 | " vec2 uv = gl_FragCoord.xy / size;" 73 | " uv.y = 1.0 - uv.y;" 74 | " outColor = texture2D(texture, uv);" 75 | "}"; 76 | 77 | const char* fragment_shader_indexed = 78 | "#version 400\n" 79 | "uniform sampler2D texture;" 80 | "uniform sampler1D palette;" 81 | "uniform vec2 size;" 82 | "out vec4 outColor;" 83 | "void main() {" 84 | " vec2 uv = gl_FragCoord.xy / size;" 85 | " uv.y = 1.0 - uv.y;" 86 | " outColor = texture1D(palette, texture2D(texture, uv).r);" 87 | "}"; 88 | 89 | glShaderSource(vertex_id, 1, &vertex_shader, NULL); 90 | glCompileShader(vertex_id); 91 | 92 | // Check Vertex Shader 93 | GLint result = GL_FALSE; 94 | int infoLength; 95 | glGetShaderiv(vertex_id, GL_COMPILE_STATUS, &result); 96 | glGetShaderiv(vertex_id, GL_INFO_LOG_LENGTH, &infoLength); 97 | if ( infoLength > 0 ){ 98 | printf("Vertex shader error\n"); 99 | } 100 | 101 | glShaderSource(fragment_id, 1, depth == 1 ? &fragment_shader_indexed : &fragment_shader , NULL); 102 | glCompileShader(fragment_id); 103 | 104 | glGetShaderiv(fragment_id, GL_COMPILE_STATUS, &result); 105 | glGetShaderiv(fragment_id, GL_INFO_LOG_LENGTH, &infoLength); 106 | if ( infoLength > 0 ){ 107 | printf("Fragment shader error\n"); 108 | } 109 | 110 | GLuint ProgramID = glCreateProgram(); 111 | glAttachShader(ProgramID, vertex_id); 112 | glAttachShader(ProgramID, fragment_id); 113 | glLinkProgram(ProgramID); 114 | glUseProgram(ProgramID); 115 | 116 | 117 | glDetachShader(ProgramID, vertex_id); 118 | glDetachShader(ProgramID, fragment_id); 119 | 120 | glDeleteShader(vertex_id); 121 | glDeleteShader(fragment_id); 122 | 123 | return ProgramID; 124 | } 125 | 126 | GLFWwindow *zero_open(char *title, int w, int h, int d, int s){ 127 | width = w; 128 | height = h; 129 | depth = d == 1 ? 1 : 4; 130 | scale = s > 1 ? s : 1; 131 | 132 | glfwInit(); 133 | glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4); 134 | glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3); 135 | glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); 136 | glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); 137 | 138 | window = glfwCreateWindow(width * scale, height * scale, title, NULL, NULL); 139 | 140 | const GLFWvidmode* video_mode = glfwGetVideoMode(glfwGetPrimaryMonitor()); 141 | glfwSetWindowPos(window, 142 | video_mode->width / 2 - (w * s) / 2, 143 | video_mode->height / 2 - (h * s) / 2); 144 | glfwSetCursorPos(window, w * s / 2, h * s / 2); 145 | 146 | glfwMakeContextCurrent(window); 147 | 148 | glewExperimental = GL_TRUE; 149 | if (glewInit() != GLEW_OK) { return 0; } 150 | 151 | GLuint program = initShaders(); 152 | 153 | glClearColor(1.0, 0.0, 0.0, 1.0); 154 | 155 | GLuint VertexArrayID; 156 | glGenVertexArrays(1, &VertexArrayID); 157 | glBindVertexArray(VertexArrayID); 158 | static const GLfloat g_vertex_buffer_data[] = { 159 | -4.0f, -4.0f, 0.0f, 160 | 4.0f, -4.0f, 0.0f, 161 | 0.0f, 4.0f, 0.0f, 162 | }; 163 | glGenBuffers(1, &vertexbuffer); 164 | glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); 165 | glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW); 166 | 167 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 168 | 169 | glDisable(GL_DEPTH_TEST); 170 | glEnable(GL_TEXTURE_2D); 171 | glGenTextures(1, &fb_texture); 172 | glBindTexture(GL_TEXTURE_2D, fb_texture); 173 | 174 | 175 | 176 | GLint loc = glGetUniformLocation(program, "size"); 177 | glUniform2f(loc, width * scale, height * scale); 178 | 179 | glActiveTexture(GL_TEXTURE0 + 0); 180 | glBindTexture(GL_TEXTURE_2D, fb_texture); 181 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 182 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 183 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 184 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 185 | glUniform1i(glGetUniformLocation(program, "texture"), 0); 186 | 187 | 188 | if (depth == 1) { 189 | glGenTextures(1, &pal_texture); 190 | glActiveTexture(GL_TEXTURE0 + 1); 191 | glBindTexture(GL_TEXTURE_1D, pal_texture); 192 | glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); 193 | glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); 194 | glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 195 | glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 196 | glUniform1i(glGetUniformLocation(program, "palette"), 1); 197 | } 198 | 199 | return window; 200 | } 201 | 202 | int zero_update(void *fb, void *pal){ 203 | 204 | glClear(GL_COLOR_BUFFER_BIT); 205 | 206 | // todo: use glTexSubImage2D instead 207 | glBindTexture(GL_TEXTURE_2D, fb_texture); 208 | if (depth == 1){ 209 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, fb); 210 | } else { 211 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, fb); 212 | } 213 | 214 | if (pal != NULL){ 215 | glBindTexture(GL_TEXTURE_1D, pal_texture); 216 | glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, 256, 0, GL_RGB, GL_UNSIGNED_BYTE, pal); 217 | active_pal = pal; 218 | } 219 | 220 | glEnableVertexAttribArray(0); 221 | glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); 222 | glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0); 223 | glDrawArrays(GL_TRIANGLES, 0, 3); 224 | glDisableVertexAttribArray(0); 225 | 226 | glfwSwapBuffers(window); 227 | glfwPollEvents(); 228 | } 229 | 230 | static void keyboard_handler(GLFWwindow* window, int key, int scancode, int action, int mods) { 231 | if (!__event_handler) return; 232 | __event_handler(action == GLFW_RELEASE ? KEY_UP : KEY_DOWN, scancode, mods); 233 | } 234 | static void mouse_position_handler(GLFWwindow* window, double x, double y){ 235 | if (!__event_handler) return; 236 | __event_handler(MOUSE_MOVE, (int)x, (int)y); 237 | } 238 | static void mouse_enter_handler(GLFWwindow* window, int entered) { 239 | if (!__event_handler) return; 240 | __event_handler(entered ? MOUSE_ENTER : MOUSE_LEAVE, 0, 0); 241 | } 242 | static void mouse_button_handler(GLFWwindow* window, int button, int action, int mods) { 243 | if (!__event_handler) return; 244 | __event_handler(action == GLFW_PRESS ? MOUSE_DOWN : MOUSE_UP, button, mods); 245 | } 246 | 247 | void zero_events(Zero_Handler_Func handler) { 248 | __event_handler = handler; 249 | if (handler) { 250 | glfwSetKeyCallback(window, keyboard_handler); 251 | glfwSetCursorPosCallback(window, mouse_position_handler); 252 | glfwSetCursorEnterCallback(window, mouse_enter_handler); 253 | glfwSetMouseButtonCallback(window, mouse_button_handler); 254 | } 255 | } 256 | 257 | -------------------------------------------------------------------------------- /src/c/linuxx11/examples/Makefile: -------------------------------------------------------------------------------- 1 | rgb: 2 | gcc -orgb rgb.c -lX11 3 | -------------------------------------------------------------------------------- /src/c/linuxx11/examples/rgb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/linuxx11/examples/rgb -------------------------------------------------------------------------------- /src/c/linuxx11/examples/rgb.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | void main(void) { 4 | unsigned char *fb = zero_open("Zero linux X11 - RGB example", 256, 256, 4, 1); 5 | unsigned int *fbp = (unsigned int *)fb; 6 | 7 | for(int y = 0; y < 256; y++) { 8 | for(int x = 0; x < 256; x++) { 9 | *fbp = MAKE_RGBA(y, x, 255 - x, 0); 10 | fbp++; 11 | } 12 | } 13 | 14 | int run = 1; 15 | while(run){ 16 | run = zero_update(fb, NULL); 17 | } 18 | 19 | zero_close(); 20 | } 21 | 22 | -------------------------------------------------------------------------------- /src/c/linuxx11/zero.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | unsigned char *zero_open(char *title, int w, int h, int d, int s); 4 | int zero_update(void *fb, void *pal); 5 | void zero_close(); 6 | 7 | #define MAKE_RGB(r,g,b) (((r)<<16) | ((g)<<8) | (b)) 8 | #define MAKE_RGBA(r,g,b,a) (((a)<<24) | ((r)<<16) | ((g)<<8) | (b)) 9 | 10 | // implementation 11 | 12 | #include 13 | #include 14 | #include 15 | #include 16 | #include 17 | 18 | static int width, height, depth, scale; 19 | static Window wnd; 20 | static Display *display = 0; 21 | static XImage *bg; 22 | static GC mainGC; 23 | static Atom WM_message[2]; 24 | 25 | unsigned char *zero_open(char *title, int w, int h, int d, int s) { 26 | fd_set eventset; 27 | fd_set zeroset; 28 | 29 | 30 | int screen; 31 | XVisualInfo vinfo; 32 | XSetWindowAttributes attr; 33 | 34 | int run = 1; 35 | 36 | FD_ZERO(&eventset); 37 | FD_ZERO(&zeroset); 38 | 39 | if(!(display = XOpenDisplay(0))) { return 0; } 40 | screen = XDefaultScreen(display); 41 | 42 | width = w; 43 | height = h; 44 | depth = d == 1 ? 1 : 4; 45 | scale = s > 0 ? s : 1; 46 | 47 | if(!XMatchVisualInfo(display, screen, 32, TrueColor, &vinfo)) { 48 | if(!XMatchVisualInfo(display, screen, 24, TrueColor, &vinfo)) { 49 | XCloseDisplay(display); 50 | return 0; 51 | } 52 | } 53 | attr.colormap = XCreateColormap(display, DefaultRootWindow(display), vinfo.visual, AllocNone); 54 | attr.border_pixel = 0; 55 | attr.background_pixel = 0x80000000; 56 | attr.bit_gravity = NorthWestGravity; 57 | attr.win_gravity = NorthWestGravity; 58 | 59 | wnd = XCreateWindow( 60 | display, DefaultRootWindow(display), 61 | 0, 0, width * scale, height * scale, 0, 62 | vinfo.depth, InputOutput, vinfo.visual, 63 | CWColormap | CWBorderPixel | CWBackPixel | CWBitGravity | CWWinGravity, &attr); 64 | 65 | // Subscribe to events 66 | WM_message[0] = XInternAtom(display, "WM_PROTOCOLS", 1); 67 | WM_message[1] = XInternAtom(display, "WM_DELETE_WINDOW", 1); 68 | XSetWMProtocols(display, wnd, WM_message, 2); 69 | 70 | XFreeColormap(display, attr.colormap); 71 | XSelectInput(display, wnd, ExposureMask | ButtonPressMask | KeyPressMask); 72 | XMapWindow(display, wnd); 73 | XFlush(display); 74 | mainGC = XCreateGC(display, wnd, 0, 0); 75 | 76 | unsigned char *fb = (unsigned char *)malloc(width * height * 4); 77 | bg = XCreateImage(display, CopyFromParent, vinfo.depth, ZPixmap, 0, 78 | fb, width, height, vinfo.depth, width * 4); 79 | 80 | return fb; 81 | } 82 | 83 | 84 | int zero_update(void *fb, void *pal) { 85 | //XKeyEvent *key; 86 | XEvent event; 87 | XNextEvent(display, &event); 88 | switch(event.type) { 89 | case Expose: 90 | XPutImage(display, wnd, mainGC, bg, 0, 0, width, height, width, height); 91 | break; 92 | 93 | case KeyPress: 94 | case DestroyNotify: 95 | return 0; 96 | 97 | case ClientMessage: 98 | if(event.xclient.message_type == WM_message[0]) 99 | if(event.xclient.data.l[0] == WM_message[1]) { 100 | return 0; 101 | } 102 | break; 103 | } 104 | return 1; 105 | } 106 | 107 | 108 | void zero_close() { 109 | XDestroyImage(bg); 110 | XDestroyWindow(display, wnd); 111 | XCloseDisplay(display); 112 | } 113 | -------------------------------------------------------------------------------- /src/c/png/examples/indexed.c: -------------------------------------------------------------------------------- 1 | #define _USE_MATH_DEFINES 2 | #include "../zero.h" 3 | 4 | int main(int argc, char **argv){ 5 | 6 | unsigned char fb [256 * 256]; 7 | unsigned char pal[256 * 3]; 8 | 9 | for(int i = 0; i < 256; i++){ 10 | pal[i * 3 + 0] = i / 2 + 128; 11 | pal[i * 3 + 1] = i / 2; 12 | pal[i * 3 + 2] = 255 - i; 13 | } 14 | 15 | for(int y = 0; y < 256; y++) { 16 | for(int x = 0; x < 256; x++) { 17 | fb[y * 256 + x] = x; 18 | } 19 | } 20 | 21 | zero_open("indexed.png", 256, 256, 1, 1); 22 | zero_update(fb, pal); 23 | return 0; 24 | } 25 | -------------------------------------------------------------------------------- /src/c/png/examples/indexed.exe: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/png/examples/indexed.exe -------------------------------------------------------------------------------- /src/c/png/examples/indexed.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/png/examples/indexed.png -------------------------------------------------------------------------------- /src/c/png/examples/make.bat: -------------------------------------------------------------------------------- 1 | cc -Ot indexed.c && indexed 2 | cc -Ot rgb.c && rgb 3 | cc -Ot rgba.c && rgba 4 | del *.obj 5 | -------------------------------------------------------------------------------- /src/c/png/examples/rgb.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | int main(int argc, char **argv){ 4 | 5 | unsigned char fb[256 * 256 * 3]; 6 | 7 | for(int y = 0; y < 256; y++) { 8 | for(int x = 0; x < 256; x++) { 9 | fb[y * 256 * 3 + x * 3 + 0] = y; 10 | fb[y * 256 * 3 + x * 3 + 1] = x; 11 | fb[y * 256 * 3 + x * 3 + 2] = 255 - x; 12 | } 13 | } 14 | 15 | zero_open("rgb.png", 256, 256, 3, 1); 16 | zero_update(fb, NULL); 17 | return 0; 18 | } 19 | -------------------------------------------------------------------------------- /src/c/png/examples/rgb.exe: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/png/examples/rgb.exe -------------------------------------------------------------------------------- /src/c/png/examples/rgb.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/png/examples/rgb.png -------------------------------------------------------------------------------- /src/c/png/examples/rgba.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | int main(int argc, char **argv){ 4 | 5 | unsigned int fb[256 * 256]; 6 | unsigned int *p = fb; 7 | 8 | for(int y = 0; y < 256; y++) { 9 | for(int x = 0; x < 256; x++) { 10 | int dx = 128 - x; 11 | int dy = 128 - y; 12 | int dist = sqrt(dx * dx + dy * dy) * 2; 13 | *p = MAKE_RGBA(y, x, 255 - x, dist > 255 ? 255: dist); 14 | p++; 15 | } 16 | } 17 | 18 | zero_open("rgba.png", 256, 256, 4, 1); 19 | zero_update(fb, NULL); 20 | return 0; 21 | } 22 | -------------------------------------------------------------------------------- /src/c/png/examples/rgba.exe: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/png/examples/rgba.exe -------------------------------------------------------------------------------- /src/c/png/examples/rgba.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/png/examples/rgba.png -------------------------------------------------------------------------------- /src/c/png/stb_image_write.h: -------------------------------------------------------------------------------- 1 | /* stb_image_write - v1.13 - public domain - http://nothings.org/stb/stb_image_write.h 2 | writes out PNG/BMP/TGA/JPEG/HDR images to C stdio - Sean Barrett 2010-2015 3 | no warranty implied; use at your own risk 4 | 5 | Before #including, 6 | 7 | #define STB_IMAGE_WRITE_IMPLEMENTATION 8 | 9 | in the file that you want to have the implementation. 10 | 11 | Will probably not work correctly with strict-aliasing optimizations. 12 | 13 | If using a modern Microsoft Compiler, non-safe versions of CRT calls may cause 14 | compilation warnings or even errors. To avoid this, also before #including, 15 | 16 | #define STBI_MSC_SECURE_CRT 17 | 18 | ABOUT: 19 | 20 | This header file is a library for writing images to C stdio or a callback. 21 | 22 | The PNG output is not optimal; it is 20-50% larger than the file 23 | written by a decent optimizing implementation; though providing a custom 24 | zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that. 25 | This library is designed for source code compactness and simplicity, 26 | not optimal image file size or run-time performance. 27 | 28 | BUILDING: 29 | 30 | You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h. 31 | You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace 32 | malloc,realloc,free. 33 | You can #define STBIW_MEMMOVE() to replace memmove() 34 | You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function 35 | for PNG compression (instead of the builtin one), it must have the following signature: 36 | unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality); 37 | The returned data will be freed with STBIW_FREE() (free() by default), 38 | so it must be heap allocated with STBIW_MALLOC() (malloc() by default), 39 | 40 | UNICODE: 41 | 42 | If compiling for Windows and you wish to use Unicode filenames, compile 43 | with 44 | #define STBIW_WINDOWS_UTF8 45 | and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert 46 | Windows wchar_t filenames to utf8. 47 | 48 | USAGE: 49 | 50 | There are five functions, one for each image file format: 51 | 52 | int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); 53 | int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); 54 | int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); 55 | int stbi_write_jpg(char const *filename, int w, int h, int comp, const void *data, int quality); 56 | int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); 57 | 58 | void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically 59 | 60 | There are also five equivalent functions that use an arbitrary write function. You are 61 | expected to open/close your file-equivalent before and after calling these: 62 | 63 | int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); 64 | int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 65 | int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 66 | int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); 67 | int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); 68 | 69 | where the callback is: 70 | void stbi_write_func(void *context, void *data, int size); 71 | 72 | You can configure it with these global variables: 73 | int stbi_write_tga_with_rle; // defaults to true; set to 0 to disable RLE 74 | int stbi_write_png_compression_level; // defaults to 8; set to higher for more compression 75 | int stbi_write_force_png_filter; // defaults to -1; set to 0..5 to force a filter mode 76 | 77 | 78 | You can define STBI_WRITE_NO_STDIO to disable the file variant of these 79 | functions, so the library will not use stdio.h at all. However, this will 80 | also disable HDR writing, because it requires stdio for formatted output. 81 | 82 | Each function returns 0 on failure and non-0 on success. 83 | 84 | The functions create an image file defined by the parameters. The image 85 | is a rectangle of pixels stored from left-to-right, top-to-bottom. 86 | Each pixel contains 'comp' channels of data stored interleaved with 8-bits 87 | per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is 88 | monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall. 89 | The *data pointer points to the first byte of the top-left-most pixel. 90 | For PNG, "stride_in_bytes" is the distance in bytes from the first byte of 91 | a row of pixels to the first byte of the next row of pixels. 92 | 93 | PNG creates output files with the same number of components as the input. 94 | The BMP format expands Y to RGB in the file format and does not 95 | output alpha. 96 | 97 | PNG supports writing rectangles of data even when the bytes storing rows of 98 | data are not consecutive in memory (e.g. sub-rectangles of a larger image), 99 | by supplying the stride between the beginning of adjacent rows. The other 100 | formats do not. (Thus you cannot write a native-format BMP through the BMP 101 | writer, both because it is in BGR order and because it may have padding 102 | at the end of the line.) 103 | 104 | PNG allows you to set the deflate compression level by setting the global 105 | variable 'stbi_write_png_compression_level' (it defaults to 8). 106 | 107 | HDR expects linear float data. Since the format is always 32-bit rgb(e) 108 | data, alpha (if provided) is discarded, and for monochrome data it is 109 | replicated across all three channels. 110 | 111 | TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed 112 | data, set the global variable 'stbi_write_tga_with_rle' to 0. 113 | 114 | JPEG does ignore alpha channels in input data; quality is between 1 and 100. 115 | Higher quality looks better but results in a bigger image. 116 | JPEG baseline (no JPEG progressive). 117 | 118 | CREDITS: 119 | 120 | 121 | Sean Barrett - PNG/BMP/TGA 122 | Baldur Karlsson - HDR 123 | Jean-Sebastien Guay - TGA monochrome 124 | Tim Kelsey - misc enhancements 125 | Alan Hickman - TGA RLE 126 | Emmanuel Julien - initial file IO callback implementation 127 | Jon Olick - original jo_jpeg.cpp code 128 | Daniel Gibson - integrate JPEG, allow external zlib 129 | Aarni Koskela - allow choosing PNG filter 130 | 131 | bugfixes: 132 | github:Chribba 133 | Guillaume Chereau 134 | github:jry2 135 | github:romigrou 136 | Sergio Gonzalez 137 | Jonas Karlsson 138 | Filip Wasil 139 | Thatcher Ulrich 140 | github:poppolopoppo 141 | Patrick Boettcher 142 | github:xeekworx 143 | Cap Petschulat 144 | Simon Rodriguez 145 | Ivan Tikhonov 146 | github:ignotion 147 | Adam Schackart 148 | 149 | LICENSE 150 | 151 | See end of file for license information. 152 | 153 | */ 154 | 155 | #ifndef INCLUDE_STB_IMAGE_WRITE_H 156 | #define INCLUDE_STB_IMAGE_WRITE_H 157 | 158 | #include 159 | 160 | // if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline' 161 | #ifndef STBIWDEF 162 | #ifdef STB_IMAGE_WRITE_STATIC 163 | #define STBIWDEF static 164 | #else 165 | #ifdef __cplusplus 166 | #define STBIWDEF extern "C" 167 | #else 168 | #define STBIWDEF extern 169 | #endif 170 | #endif 171 | #endif 172 | 173 | #ifndef STB_IMAGE_WRITE_STATIC // C++ forbids static forward declarations 174 | extern int stbi_write_tga_with_rle; 175 | extern int stbi_write_png_compression_level; 176 | extern int stbi_write_force_png_filter; 177 | #endif 178 | 179 | #ifndef STBI_WRITE_NO_STDIO 180 | STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); 181 | STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); 182 | STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); 183 | STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); 184 | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality); 185 | 186 | #ifdef STBI_WINDOWS_UTF8 187 | STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input); 188 | #endif 189 | #endif 190 | 191 | typedef void stbi_write_func(void *context, void *data, int size); 192 | 193 | STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data, int stride_in_bytes); 194 | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 195 | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 196 | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); 197 | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); 198 | 199 | STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean); 200 | 201 | #endif//INCLUDE_STB_IMAGE_WRITE_H 202 | 203 | #ifdef STB_IMAGE_WRITE_IMPLEMENTATION 204 | 205 | #ifdef _WIN32 206 | #ifndef _CRT_SECURE_NO_WARNINGS 207 | #define _CRT_SECURE_NO_WARNINGS 208 | #endif 209 | #ifndef _CRT_NONSTDC_NO_DEPRECATE 210 | #define _CRT_NONSTDC_NO_DEPRECATE 211 | #endif 212 | #endif 213 | 214 | #ifndef STBI_WRITE_NO_STDIO 215 | #include 216 | #endif // STBI_WRITE_NO_STDIO 217 | 218 | #include 219 | #include 220 | #include 221 | #include 222 | 223 | #if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED)) 224 | // ok 225 | #elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED) 226 | // ok 227 | #else 228 | #error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)." 229 | #endif 230 | 231 | #ifndef STBIW_MALLOC 232 | #define STBIW_MALLOC(sz) malloc(sz) 233 | #define STBIW_REALLOC(p,newsz) realloc(p,newsz) 234 | #define STBIW_FREE(p) free(p) 235 | #endif 236 | 237 | #ifndef STBIW_REALLOC_SIZED 238 | #define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz) 239 | #endif 240 | 241 | 242 | #ifndef STBIW_MEMMOVE 243 | #define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz) 244 | #endif 245 | 246 | 247 | #ifndef STBIW_ASSERT 248 | #include 249 | #define STBIW_ASSERT(x) assert(x) 250 | #endif 251 | 252 | #define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) 253 | 254 | #ifdef STB_IMAGE_WRITE_STATIC 255 | static int stbi__flip_vertically_on_write=0; 256 | static int stbi_write_png_compression_level = 8; 257 | static int stbi_write_tga_with_rle = 1; 258 | static int stbi_write_force_png_filter = -1; 259 | #else 260 | int stbi_write_png_compression_level = 8; 261 | int stbi__flip_vertically_on_write=0; 262 | int stbi_write_tga_with_rle = 1; 263 | int stbi_write_force_png_filter = -1; 264 | #endif 265 | 266 | STBIWDEF void stbi_flip_vertically_on_write(int flag) 267 | { 268 | stbi__flip_vertically_on_write = flag; 269 | } 270 | 271 | typedef struct 272 | { 273 | stbi_write_func *func; 274 | void *context; 275 | } stbi__write_context; 276 | 277 | // initialize a callback-based context 278 | static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context) 279 | { 280 | s->func = c; 281 | s->context = context; 282 | } 283 | 284 | #ifndef STBI_WRITE_NO_STDIO 285 | 286 | static void stbi__stdio_write(void *context, void *data, int size) 287 | { 288 | fwrite(data,1,size,(FILE*) context); 289 | } 290 | 291 | #if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) 292 | #ifdef __cplusplus 293 | #define STBIW_EXTERN extern "C" 294 | #else 295 | #define STBIW_EXTERN extern 296 | #endif 297 | STBIW_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); 298 | STBIW_EXTERN __declspec(dllimport) int __stdcall WideCharToMultiByte(unsigned int cp, unsigned long flags, const wchar_t *widestr, int cchwide, char *str, int cbmb, const char *defchar, int *used_default); 299 | 300 | STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) 301 | { 302 | return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); 303 | } 304 | #endif 305 | 306 | static FILE *stbiw__fopen(char const *filename, char const *mode) 307 | { 308 | FILE *f; 309 | #if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) 310 | wchar_t wMode[64]; 311 | wchar_t wFilename[1024]; 312 | if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename))) 313 | return 0; 314 | 315 | if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode))) 316 | return 0; 317 | 318 | #if _MSC_VER >= 1400 319 | if (0 != _wfopen_s(&f, wFilename, wMode)) 320 | f = 0; 321 | #else 322 | f = _wfopen(wFilename, wMode); 323 | #endif 324 | 325 | #elif defined(_MSC_VER) && _MSC_VER >= 1400 326 | if (0 != fopen_s(&f, filename, mode)) 327 | f=0; 328 | #else 329 | f = fopen(filename, mode); 330 | #endif 331 | return f; 332 | } 333 | 334 | static int stbi__start_write_file(stbi__write_context *s, const char *filename) 335 | { 336 | FILE *f = stbiw__fopen(filename, "wb"); 337 | stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f); 338 | return f != NULL; 339 | } 340 | 341 | static void stbi__end_write_file(stbi__write_context *s) 342 | { 343 | fclose((FILE *)s->context); 344 | } 345 | 346 | #endif // !STBI_WRITE_NO_STDIO 347 | 348 | typedef unsigned int stbiw_uint32; 349 | typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1]; 350 | 351 | static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v) 352 | { 353 | while (*fmt) { 354 | switch (*fmt++) { 355 | case ' ': break; 356 | case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int)); 357 | s->func(s->context,&x,1); 358 | break; } 359 | case '2': { int x = va_arg(v,int); 360 | unsigned char b[2]; 361 | b[0] = STBIW_UCHAR(x); 362 | b[1] = STBIW_UCHAR(x>>8); 363 | s->func(s->context,b,2); 364 | break; } 365 | case '4': { stbiw_uint32 x = va_arg(v,int); 366 | unsigned char b[4]; 367 | b[0]=STBIW_UCHAR(x); 368 | b[1]=STBIW_UCHAR(x>>8); 369 | b[2]=STBIW_UCHAR(x>>16); 370 | b[3]=STBIW_UCHAR(x>>24); 371 | s->func(s->context,b,4); 372 | break; } 373 | default: 374 | STBIW_ASSERT(0); 375 | return; 376 | } 377 | } 378 | } 379 | 380 | static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) 381 | { 382 | va_list v; 383 | va_start(v, fmt); 384 | stbiw__writefv(s, fmt, v); 385 | va_end(v); 386 | } 387 | 388 | static void stbiw__putc(stbi__write_context *s, unsigned char c) 389 | { 390 | s->func(s->context, &c, 1); 391 | } 392 | 393 | static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) 394 | { 395 | unsigned char arr[3]; 396 | arr[0] = a; arr[1] = b; arr[2] = c; 397 | s->func(s->context, arr, 3); 398 | } 399 | 400 | static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d) 401 | { 402 | unsigned char bg[3] = { 255, 0, 255}, px[3]; 403 | int k; 404 | 405 | if (write_alpha < 0) 406 | s->func(s->context, &d[comp - 1], 1); 407 | 408 | switch (comp) { 409 | case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case 410 | case 1: 411 | if (expand_mono) 412 | stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp 413 | else 414 | s->func(s->context, d, 1); // monochrome TGA 415 | break; 416 | case 4: 417 | if (!write_alpha) { 418 | // composite against pink background 419 | for (k = 0; k < 3; ++k) 420 | px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255; 421 | stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]); 422 | break; 423 | } 424 | /* FALLTHROUGH */ 425 | case 3: 426 | stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]); 427 | break; 428 | } 429 | if (write_alpha > 0) 430 | s->func(s->context, &d[comp - 1], 1); 431 | } 432 | 433 | static void stbiw__write_pixels(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, void *data, int write_alpha, int scanline_pad, int expand_mono) 434 | { 435 | stbiw_uint32 zero = 0; 436 | int i,j, j_end; 437 | 438 | if (y <= 0) 439 | return; 440 | 441 | if (stbi__flip_vertically_on_write) 442 | vdir *= -1; 443 | 444 | if (vdir < 0) { 445 | j_end = -1; j = y-1; 446 | } else { 447 | j_end = y; j = 0; 448 | } 449 | 450 | for (; j != j_end; j += vdir) { 451 | for (i=0; i < x; ++i) { 452 | unsigned char *d = (unsigned char *) data + (j*x+i)*comp; 453 | stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d); 454 | } 455 | s->func(s->context, &zero, scanline_pad); 456 | } 457 | } 458 | 459 | static int stbiw__outfile(stbi__write_context *s, int rgb_dir, int vdir, int x, int y, int comp, int expand_mono, void *data, int alpha, int pad, const char *fmt, ...) 460 | { 461 | if (y < 0 || x < 0) { 462 | return 0; 463 | } else { 464 | va_list v; 465 | va_start(v, fmt); 466 | stbiw__writefv(s, fmt, v); 467 | va_end(v); 468 | stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono); 469 | return 1; 470 | } 471 | } 472 | 473 | static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data) 474 | { 475 | int pad = (-x*3) & 3; 476 | return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad, 477 | "11 4 22 4" "4 44 22 444444", 478 | 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header 479 | 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header 480 | } 481 | 482 | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) 483 | { 484 | stbi__write_context s; 485 | stbi__start_write_callbacks(&s, func, context); 486 | return stbi_write_bmp_core(&s, x, y, comp, data); 487 | } 488 | 489 | #ifndef STBI_WRITE_NO_STDIO 490 | STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) 491 | { 492 | stbi__write_context s; 493 | if (stbi__start_write_file(&s,filename)) { 494 | int r = stbi_write_bmp_core(&s, x, y, comp, data); 495 | stbi__end_write_file(&s); 496 | return r; 497 | } else 498 | return 0; 499 | } 500 | #endif //!STBI_WRITE_NO_STDIO 501 | 502 | static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data) 503 | { 504 | int has_alpha = (comp == 2 || comp == 4); 505 | int colorbytes = has_alpha ? comp-1 : comp; 506 | int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3 507 | 508 | if (y < 0 || x < 0) 509 | return 0; 510 | 511 | if (!stbi_write_tga_with_rle) { 512 | return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0, 513 | "111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8); 514 | } else { 515 | int i,j,k; 516 | int jend, jdir; 517 | 518 | stbiw__writef(s, "111 221 2222 11", 0,0,format+8, 0,0,0, 0,0,x,y, (colorbytes + has_alpha) * 8, has_alpha * 8); 519 | 520 | if (stbi__flip_vertically_on_write) { 521 | j = 0; 522 | jend = y; 523 | jdir = 1; 524 | } else { 525 | j = y-1; 526 | jend = -1; 527 | jdir = -1; 528 | } 529 | for (; j != jend; j += jdir) { 530 | unsigned char *row = (unsigned char *) data + j * x * comp; 531 | int len; 532 | 533 | for (i = 0; i < x; i += len) { 534 | unsigned char *begin = row + i * comp; 535 | int diff = 1; 536 | len = 1; 537 | 538 | if (i < x - 1) { 539 | ++len; 540 | diff = memcmp(begin, row + (i + 1) * comp, comp); 541 | if (diff) { 542 | const unsigned char *prev = begin; 543 | for (k = i + 2; k < x && len < 128; ++k) { 544 | if (memcmp(prev, row + k * comp, comp)) { 545 | prev += comp; 546 | ++len; 547 | } else { 548 | --len; 549 | break; 550 | } 551 | } 552 | } else { 553 | for (k = i + 2; k < x && len < 128; ++k) { 554 | if (!memcmp(begin, row + k * comp, comp)) { 555 | ++len; 556 | } else { 557 | break; 558 | } 559 | } 560 | } 561 | } 562 | 563 | if (diff) { 564 | unsigned char header = STBIW_UCHAR(len - 1); 565 | s->func(s->context, &header, 1); 566 | for (k = 0; k < len; ++k) { 567 | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp); 568 | } 569 | } else { 570 | unsigned char header = STBIW_UCHAR(len - 129); 571 | s->func(s->context, &header, 1); 572 | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); 573 | } 574 | } 575 | } 576 | } 577 | return 1; 578 | } 579 | 580 | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) 581 | { 582 | stbi__write_context s; 583 | stbi__start_write_callbacks(&s, func, context); 584 | return stbi_write_tga_core(&s, x, y, comp, (void *) data); 585 | } 586 | 587 | #ifndef STBI_WRITE_NO_STDIO 588 | STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) 589 | { 590 | stbi__write_context s; 591 | if (stbi__start_write_file(&s,filename)) { 592 | int r = stbi_write_tga_core(&s, x, y, comp, (void *) data); 593 | stbi__end_write_file(&s); 594 | return r; 595 | } else 596 | return 0; 597 | } 598 | #endif 599 | 600 | // ************************************************************************************************* 601 | // Radiance RGBE HDR writer 602 | // by Baldur Karlsson 603 | 604 | #define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) 605 | 606 | static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) 607 | { 608 | int exponent; 609 | float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2])); 610 | 611 | if (maxcomp < 1e-32f) { 612 | rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0; 613 | } else { 614 | float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp; 615 | 616 | rgbe[0] = (unsigned char)(linear[0] * normalize); 617 | rgbe[1] = (unsigned char)(linear[1] * normalize); 618 | rgbe[2] = (unsigned char)(linear[2] * normalize); 619 | rgbe[3] = (unsigned char)(exponent + 128); 620 | } 621 | } 622 | 623 | static void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte) 624 | { 625 | unsigned char lengthbyte = STBIW_UCHAR(length+128); 626 | STBIW_ASSERT(length+128 <= 255); 627 | s->func(s->context, &lengthbyte, 1); 628 | s->func(s->context, &databyte, 1); 629 | } 630 | 631 | static void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data) 632 | { 633 | unsigned char lengthbyte = STBIW_UCHAR(length); 634 | STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code 635 | s->func(s->context, &lengthbyte, 1); 636 | s->func(s->context, data, length); 637 | } 638 | 639 | static void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline) 640 | { 641 | unsigned char scanlineheader[4] = { 2, 2, 0, 0 }; 642 | unsigned char rgbe[4]; 643 | float linear[3]; 644 | int x; 645 | 646 | scanlineheader[2] = (width&0xff00)>>8; 647 | scanlineheader[3] = (width&0x00ff); 648 | 649 | /* skip RLE for images too small or large */ 650 | if (width < 8 || width >= 32768) { 651 | for (x=0; x < width; x++) { 652 | switch (ncomp) { 653 | case 4: /* fallthrough */ 654 | case 3: linear[2] = scanline[x*ncomp + 2]; 655 | linear[1] = scanline[x*ncomp + 1]; 656 | linear[0] = scanline[x*ncomp + 0]; 657 | break; 658 | default: 659 | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; 660 | break; 661 | } 662 | stbiw__linear_to_rgbe(rgbe, linear); 663 | s->func(s->context, rgbe, 4); 664 | } 665 | } else { 666 | int c,r; 667 | /* encode into scratch buffer */ 668 | for (x=0; x < width; x++) { 669 | switch(ncomp) { 670 | case 4: /* fallthrough */ 671 | case 3: linear[2] = scanline[x*ncomp + 2]; 672 | linear[1] = scanline[x*ncomp + 1]; 673 | linear[0] = scanline[x*ncomp + 0]; 674 | break; 675 | default: 676 | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; 677 | break; 678 | } 679 | stbiw__linear_to_rgbe(rgbe, linear); 680 | scratch[x + width*0] = rgbe[0]; 681 | scratch[x + width*1] = rgbe[1]; 682 | scratch[x + width*2] = rgbe[2]; 683 | scratch[x + width*3] = rgbe[3]; 684 | } 685 | 686 | s->func(s->context, scanlineheader, 4); 687 | 688 | /* RLE each component separately */ 689 | for (c=0; c < 4; c++) { 690 | unsigned char *comp = &scratch[width*c]; 691 | 692 | x = 0; 693 | while (x < width) { 694 | // find first run 695 | r = x; 696 | while (r+2 < width) { 697 | if (comp[r] == comp[r+1] && comp[r] == comp[r+2]) 698 | break; 699 | ++r; 700 | } 701 | if (r+2 >= width) 702 | r = width; 703 | // dump up to first run 704 | while (x < r) { 705 | int len = r-x; 706 | if (len > 128) len = 128; 707 | stbiw__write_dump_data(s, len, &comp[x]); 708 | x += len; 709 | } 710 | // if there's a run, output it 711 | if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd 712 | // find next byte after run 713 | while (r < width && comp[r] == comp[x]) 714 | ++r; 715 | // output run up to r 716 | while (x < r) { 717 | int len = r-x; 718 | if (len > 127) len = 127; 719 | stbiw__write_run_data(s, len, comp[x]); 720 | x += len; 721 | } 722 | } 723 | } 724 | } 725 | } 726 | } 727 | 728 | static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data) 729 | { 730 | if (y <= 0 || x <= 0 || data == NULL) 731 | return 0; 732 | else { 733 | // Each component is stored separately. Allocate scratch space for full output scanline. 734 | unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4); 735 | int i, len; 736 | char buffer[128]; 737 | char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n"; 738 | s->func(s->context, header, sizeof(header)-1); 739 | 740 | #ifdef __STDC_WANT_SECURE_LIB__ 741 | len = sprintf_s(buffer, sizeof(buffer), "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); 742 | #else 743 | len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); 744 | #endif 745 | s->func(s->context, buffer, len); 746 | 747 | for(i=0; i < y; i++) 748 | stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i)); 749 | STBIW_FREE(scratch); 750 | return 1; 751 | } 752 | } 753 | 754 | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data) 755 | { 756 | stbi__write_context s; 757 | stbi__start_write_callbacks(&s, func, context); 758 | return stbi_write_hdr_core(&s, x, y, comp, (float *) data); 759 | } 760 | 761 | #ifndef STBI_WRITE_NO_STDIO 762 | STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) 763 | { 764 | stbi__write_context s; 765 | if (stbi__start_write_file(&s,filename)) { 766 | int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data); 767 | stbi__end_write_file(&s); 768 | return r; 769 | } else 770 | return 0; 771 | } 772 | #endif // STBI_WRITE_NO_STDIO 773 | 774 | 775 | ////////////////////////////////////////////////////////////////////////////// 776 | // 777 | // PNG writer 778 | // 779 | 780 | #ifndef STBIW_ZLIB_COMPRESS 781 | // stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() 782 | #define stbiw__sbraw(a) ((int *) (a) - 2) 783 | #define stbiw__sbm(a) stbiw__sbraw(a)[0] 784 | #define stbiw__sbn(a) stbiw__sbraw(a)[1] 785 | 786 | #define stbiw__sbneedgrow(a,n) ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a)) 787 | #define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0) 788 | #define stbiw__sbgrow(a,n) stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a))) 789 | 790 | #define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v)) 791 | #define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0) 792 | #define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0) 793 | 794 | static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) 795 | { 796 | int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1; 797 | void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2); 798 | STBIW_ASSERT(p); 799 | if (p) { 800 | if (!*arr) ((int *) p)[1] = 0; 801 | *arr = (void *) ((int *) p + 2); 802 | stbiw__sbm(*arr) = m; 803 | } 804 | return *arr; 805 | } 806 | 807 | static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount) 808 | { 809 | while (*bitcount >= 8) { 810 | stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer)); 811 | *bitbuffer >>= 8; 812 | *bitcount -= 8; 813 | } 814 | return data; 815 | } 816 | 817 | static int stbiw__zlib_bitrev(int code, int codebits) 818 | { 819 | int res=0; 820 | while (codebits--) { 821 | res = (res << 1) | (code & 1); 822 | code >>= 1; 823 | } 824 | return res; 825 | } 826 | 827 | static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit) 828 | { 829 | int i; 830 | for (i=0; i < limit && i < 258; ++i) 831 | if (a[i] != b[i]) break; 832 | return i; 833 | } 834 | 835 | static unsigned int stbiw__zhash(unsigned char *data) 836 | { 837 | stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16); 838 | hash ^= hash << 3; 839 | hash += hash >> 5; 840 | hash ^= hash << 4; 841 | hash += hash >> 17; 842 | hash ^= hash << 25; 843 | hash += hash >> 6; 844 | return hash; 845 | } 846 | 847 | #define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount)) 848 | #define stbiw__zlib_add(code,codebits) \ 849 | (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush()) 850 | #define stbiw__zlib_huffa(b,c) stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c) 851 | // default huffman tables 852 | #define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8) 853 | #define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n)-144, 9) 854 | #define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n)-256,7) 855 | #define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n)-280,8) 856 | #define stbiw__zlib_huff(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : (n) <= 255 ? stbiw__zlib_huff2(n) : (n) <= 279 ? stbiw__zlib_huff3(n) : stbiw__zlib_huff4(n)) 857 | #define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n)) 858 | 859 | #define stbiw__ZHASH 16384 860 | 861 | #endif // STBIW_ZLIB_COMPRESS 862 | 863 | STBIWDEF unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality) 864 | { 865 | #ifdef STBIW_ZLIB_COMPRESS 866 | // user provided a zlib compress implementation, use that 867 | return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality); 868 | #else // use builtin 869 | static unsigned short lengthc[] = { 3,4,5,6,7,8,9,10,11,13,15,17,19,23,27,31,35,43,51,59,67,83,99,115,131,163,195,227,258, 259 }; 870 | static unsigned char lengtheb[]= { 0,0,0,0,0,0,0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0 }; 871 | static unsigned short distc[] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577, 32768 }; 872 | static unsigned char disteb[] = { 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13 }; 873 | unsigned int bitbuf=0; 874 | int i,j, bitcount=0; 875 | unsigned char *out = NULL; 876 | unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(char**)); 877 | if (hash_table == NULL) 878 | return NULL; 879 | if (quality < 5) quality = 5; 880 | 881 | stbiw__sbpush(out, 0x78); // DEFLATE 32K window 882 | stbiw__sbpush(out, 0x5e); // FLEVEL = 1 883 | stbiw__zlib_add(1,1); // BFINAL = 1 884 | stbiw__zlib_add(1,2); // BTYPE = 1 -- fixed huffman 885 | 886 | for (i=0; i < stbiw__ZHASH; ++i) 887 | hash_table[i] = NULL; 888 | 889 | i=0; 890 | while (i < data_len-3) { 891 | // hash next 3 bytes of data to be compressed 892 | int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3; 893 | unsigned char *bestloc = 0; 894 | unsigned char **hlist = hash_table[h]; 895 | int n = stbiw__sbcount(hlist); 896 | for (j=0; j < n; ++j) { 897 | if (hlist[j]-data > i-32768) { // if entry lies within window 898 | int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i); 899 | if (d >= best) { best=d; bestloc=hlist[j]; } 900 | } 901 | } 902 | // when hash table entry is too long, delete half the entries 903 | if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) { 904 | STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality); 905 | stbiw__sbn(hash_table[h]) = quality; 906 | } 907 | stbiw__sbpush(hash_table[h],data+i); 908 | 909 | if (bestloc) { 910 | // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal 911 | h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1); 912 | hlist = hash_table[h]; 913 | n = stbiw__sbcount(hlist); 914 | for (j=0; j < n; ++j) { 915 | if (hlist[j]-data > i-32767) { 916 | int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1); 917 | if (e > best) { // if next match is better, bail on current match 918 | bestloc = NULL; 919 | break; 920 | } 921 | } 922 | } 923 | } 924 | 925 | if (bestloc) { 926 | int d = (int) (data+i - bestloc); // distance back 927 | STBIW_ASSERT(d <= 32767 && best <= 258); 928 | for (j=0; best > lengthc[j+1]-1; ++j); 929 | stbiw__zlib_huff(j+257); 930 | if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]); 931 | for (j=0; d > distc[j+1]-1; ++j); 932 | stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5); 933 | if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]); 934 | i += best; 935 | } else { 936 | stbiw__zlib_huffb(data[i]); 937 | ++i; 938 | } 939 | } 940 | // write out final bytes 941 | for (;i < data_len; ++i) 942 | stbiw__zlib_huffb(data[i]); 943 | stbiw__zlib_huff(256); // end of block 944 | // pad with 0 bits to byte boundary 945 | while (bitcount) 946 | stbiw__zlib_add(0,1); 947 | 948 | for (i=0; i < stbiw__ZHASH; ++i) 949 | (void) stbiw__sbfree(hash_table[i]); 950 | STBIW_FREE(hash_table); 951 | 952 | { 953 | // compute adler32 on input 954 | unsigned int s1=1, s2=0; 955 | int blocklen = (int) (data_len % 5552); 956 | j=0; 957 | while (j < data_len) { 958 | for (i=0; i < blocklen; ++i) { s1 += data[j+i]; s2 += s1; } 959 | s1 %= 65521; s2 %= 65521; 960 | j += blocklen; 961 | blocklen = 5552; 962 | } 963 | stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8)); 964 | stbiw__sbpush(out, STBIW_UCHAR(s2)); 965 | stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8)); 966 | stbiw__sbpush(out, STBIW_UCHAR(s1)); 967 | } 968 | *out_len = stbiw__sbn(out); 969 | // make returned pointer freeable 970 | STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len); 971 | return (unsigned char *) stbiw__sbraw(out); 972 | #endif // STBIW_ZLIB_COMPRESS 973 | } 974 | 975 | static unsigned int stbiw__crc32(unsigned char *buffer, int len) 976 | { 977 | #ifdef STBIW_CRC32 978 | return STBIW_CRC32(buffer, len); 979 | #else 980 | static unsigned int crc_table[256] = 981 | { 982 | 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 983 | 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 984 | 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 985 | 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 986 | 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 987 | 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 988 | 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 989 | 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 990 | 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 991 | 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 992 | 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 993 | 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 994 | 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 995 | 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 996 | 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 997 | 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 998 | 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 999 | 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 1000 | 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 1001 | 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 1002 | 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 1003 | 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 1004 | 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 1005 | 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 1006 | 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 1007 | 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 1008 | 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 1009 | 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 1010 | 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 1011 | 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 1012 | 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 1013 | 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D 1014 | }; 1015 | 1016 | unsigned int crc = ~0u; 1017 | int i; 1018 | for (i=0; i < len; ++i) 1019 | crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)]; 1020 | return ~crc; 1021 | #endif 1022 | } 1023 | 1024 | #define stbiw__wpng4(o,a,b,c,d) ((o)[0]=STBIW_UCHAR(a),(o)[1]=STBIW_UCHAR(b),(o)[2]=STBIW_UCHAR(c),(o)[3]=STBIW_UCHAR(d),(o)+=4) 1025 | #define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v)); 1026 | #define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3]) 1027 | 1028 | static void stbiw__wpcrc(unsigned char **data, int len) 1029 | { 1030 | unsigned int crc = stbiw__crc32(*data - len - 4, len+4); 1031 | stbiw__wp32(*data, crc); 1032 | } 1033 | 1034 | static unsigned char stbiw__paeth(int a, int b, int c) 1035 | { 1036 | int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c); 1037 | if (pa <= pb && pa <= pc) return STBIW_UCHAR(a); 1038 | if (pb <= pc) return STBIW_UCHAR(b); 1039 | return STBIW_UCHAR(c); 1040 | } 1041 | 1042 | // @OPTIMIZE: provide an option that always forces left-predict or paeth predict 1043 | static void stbiw__encode_png_line(unsigned char *pixels, int stride_bytes, int width, int height, int y, int n, int filter_type, signed char *line_buffer) 1044 | { 1045 | static int mapping[] = { 0,1,2,3,4 }; 1046 | static int firstmap[] = { 0,1,0,5,6 }; 1047 | int *mymap = (y != 0) ? mapping : firstmap; 1048 | int i; 1049 | int type = mymap[filter_type]; 1050 | unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y); 1051 | int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes; 1052 | 1053 | if (type==0) { 1054 | memcpy(line_buffer, z, width*n); 1055 | return; 1056 | } 1057 | 1058 | // first loop isn't optimized since it's just one pixel 1059 | for (i = 0; i < n; ++i) { 1060 | switch (type) { 1061 | case 1: line_buffer[i] = z[i]; break; 1062 | case 2: line_buffer[i] = z[i] - z[i-signed_stride]; break; 1063 | case 3: line_buffer[i] = z[i] - (z[i-signed_stride]>>1); break; 1064 | case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-signed_stride],0)); break; 1065 | case 5: line_buffer[i] = z[i]; break; 1066 | case 6: line_buffer[i] = z[i]; break; 1067 | } 1068 | } 1069 | switch (type) { 1070 | case 1: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-n]; break; 1071 | case 2: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-signed_stride]; break; 1072 | case 3: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - ((z[i-n] + z[i-signed_stride])>>1); break; 1073 | case 4: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], z[i-signed_stride], z[i-signed_stride-n]); break; 1074 | case 5: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - (z[i-n]>>1); break; 1075 | case 6: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break; 1076 | } 1077 | } 1078 | 1079 | STBIWDEF unsigned char *stbi_write_png_to_mem(const unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) 1080 | { 1081 | int force_filter = stbi_write_force_png_filter; 1082 | int ctype[5] = { -1, 0, 4, 2, 6 }; 1083 | unsigned char sig[8] = { 137,80,78,71,13,10,26,10 }; 1084 | unsigned char *out,*o, *filt, *zlib; 1085 | signed char *line_buffer; 1086 | int j,zlen; 1087 | 1088 | if (stride_bytes == 0) 1089 | stride_bytes = x * n; 1090 | 1091 | if (force_filter >= 5) { 1092 | force_filter = -1; 1093 | } 1094 | 1095 | filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0; 1096 | line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; } 1097 | for (j=0; j < y; ++j) { 1098 | int filter_type; 1099 | if (force_filter > -1) { 1100 | filter_type = force_filter; 1101 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, force_filter, line_buffer); 1102 | } else { // Estimate the best filter by running through all of them: 1103 | int best_filter = 0, best_filter_val = 0x7fffffff, est, i; 1104 | for (filter_type = 0; filter_type < 5; filter_type++) { 1105 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, filter_type, line_buffer); 1106 | 1107 | // Estimate the entropy of the line using this filter; the less, the better. 1108 | est = 0; 1109 | for (i = 0; i < x*n; ++i) { 1110 | est += abs((signed char) line_buffer[i]); 1111 | } 1112 | if (est < best_filter_val) { 1113 | best_filter_val = est; 1114 | best_filter = filter_type; 1115 | } 1116 | } 1117 | if (filter_type != best_filter) { // If the last iteration already got us the best filter, don't redo it 1118 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, best_filter, line_buffer); 1119 | filter_type = best_filter; 1120 | } 1121 | } 1122 | // when we get here, filter_type contains the filter type, and line_buffer contains the data 1123 | filt[j*(x*n+1)] = (unsigned char) filter_type; 1124 | STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n); 1125 | } 1126 | STBIW_FREE(line_buffer); 1127 | zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, stbi_write_png_compression_level); 1128 | STBIW_FREE(filt); 1129 | if (!zlib) return 0; 1130 | 1131 | // each tag requires 12 bytes of overhead 1132 | out = (unsigned char *) STBIW_MALLOC(8 + 12+13 + 12+zlen + 12); 1133 | if (!out) return 0; 1134 | *out_len = 8 + 12+13 + 12+zlen + 12; 1135 | 1136 | o=out; 1137 | STBIW_MEMMOVE(o,sig,8); o+= 8; 1138 | stbiw__wp32(o, 13); // header length 1139 | stbiw__wptag(o, "IHDR"); 1140 | stbiw__wp32(o, x); 1141 | stbiw__wp32(o, y); 1142 | *o++ = 8; 1143 | *o++ = STBIW_UCHAR(ctype[n]); 1144 | *o++ = 0; 1145 | *o++ = 0; 1146 | *o++ = 0; 1147 | stbiw__wpcrc(&o,13); 1148 | 1149 | stbiw__wp32(o, zlen); 1150 | stbiw__wptag(o, "IDAT"); 1151 | STBIW_MEMMOVE(o, zlib, zlen); 1152 | o += zlen; 1153 | STBIW_FREE(zlib); 1154 | stbiw__wpcrc(&o, zlen); 1155 | 1156 | stbiw__wp32(o,0); 1157 | stbiw__wptag(o, "IEND"); 1158 | stbiw__wpcrc(&o,0); 1159 | 1160 | STBIW_ASSERT(o == out + *out_len); 1161 | 1162 | return out; 1163 | } 1164 | 1165 | #ifndef STBI_WRITE_NO_STDIO 1166 | STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) 1167 | { 1168 | FILE *f; 1169 | int len; 1170 | unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); 1171 | if (png == NULL) return 0; 1172 | 1173 | f = stbiw__fopen(filename, "wb"); 1174 | if (!f) { STBIW_FREE(png); return 0; } 1175 | fwrite(png, 1, len, f); 1176 | fclose(f); 1177 | STBIW_FREE(png); 1178 | return 1; 1179 | } 1180 | #endif 1181 | 1182 | STBIWDEF int stbi_write_png_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int stride_bytes) 1183 | { 1184 | int len; 1185 | unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); 1186 | if (png == NULL) return 0; 1187 | func(context, png, len); 1188 | STBIW_FREE(png); 1189 | return 1; 1190 | } 1191 | 1192 | 1193 | /* *************************************************************************** 1194 | * 1195 | * JPEG writer 1196 | * 1197 | * This is based on Jon Olick's jo_jpeg.cpp: 1198 | * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html 1199 | */ 1200 | 1201 | static const unsigned char stbiw__jpg_ZigZag[] = { 0,1,5,6,14,15,27,28,2,4,7,13,16,26,29,42,3,8,12,17,25,30,41,43,9,11,18, 1202 | 24,31,40,44,53,10,19,23,32,39,45,52,54,20,22,33,38,46,51,55,60,21,34,37,47,50,56,59,61,35,36,48,49,57,58,62,63 }; 1203 | 1204 | static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs) { 1205 | int bitBuf = *bitBufP, bitCnt = *bitCntP; 1206 | bitCnt += bs[1]; 1207 | bitBuf |= bs[0] << (24 - bitCnt); 1208 | while(bitCnt >= 8) { 1209 | unsigned char c = (bitBuf >> 16) & 255; 1210 | stbiw__putc(s, c); 1211 | if(c == 255) { 1212 | stbiw__putc(s, 0); 1213 | } 1214 | bitBuf <<= 8; 1215 | bitCnt -= 8; 1216 | } 1217 | *bitBufP = bitBuf; 1218 | *bitCntP = bitCnt; 1219 | } 1220 | 1221 | static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p, float *d7p) { 1222 | float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p; 1223 | float z1, z2, z3, z4, z5, z11, z13; 1224 | 1225 | float tmp0 = d0 + d7; 1226 | float tmp7 = d0 - d7; 1227 | float tmp1 = d1 + d6; 1228 | float tmp6 = d1 - d6; 1229 | float tmp2 = d2 + d5; 1230 | float tmp5 = d2 - d5; 1231 | float tmp3 = d3 + d4; 1232 | float tmp4 = d3 - d4; 1233 | 1234 | // Even part 1235 | float tmp10 = tmp0 + tmp3; // phase 2 1236 | float tmp13 = tmp0 - tmp3; 1237 | float tmp11 = tmp1 + tmp2; 1238 | float tmp12 = tmp1 - tmp2; 1239 | 1240 | d0 = tmp10 + tmp11; // phase 3 1241 | d4 = tmp10 - tmp11; 1242 | 1243 | z1 = (tmp12 + tmp13) * 0.707106781f; // c4 1244 | d2 = tmp13 + z1; // phase 5 1245 | d6 = tmp13 - z1; 1246 | 1247 | // Odd part 1248 | tmp10 = tmp4 + tmp5; // phase 2 1249 | tmp11 = tmp5 + tmp6; 1250 | tmp12 = tmp6 + tmp7; 1251 | 1252 | // The rotator is modified from fig 4-8 to avoid extra negations. 1253 | z5 = (tmp10 - tmp12) * 0.382683433f; // c6 1254 | z2 = tmp10 * 0.541196100f + z5; // c2-c6 1255 | z4 = tmp12 * 1.306562965f + z5; // c2+c6 1256 | z3 = tmp11 * 0.707106781f; // c4 1257 | 1258 | z11 = tmp7 + z3; // phase 5 1259 | z13 = tmp7 - z3; 1260 | 1261 | *d5p = z13 + z2; // phase 6 1262 | *d3p = z13 - z2; 1263 | *d1p = z11 + z4; 1264 | *d7p = z11 - z4; 1265 | 1266 | *d0p = d0; *d2p = d2; *d4p = d4; *d6p = d6; 1267 | } 1268 | 1269 | static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) { 1270 | int tmp1 = val < 0 ? -val : val; 1271 | val = val < 0 ? val-1 : val; 1272 | bits[1] = 1; 1273 | while(tmp1 >>= 1) { 1274 | ++bits[1]; 1275 | } 1276 | bits[0] = val & ((1<0)&&(DU[end0pos]==0); --end0pos) { 1314 | } 1315 | // end0pos = first element in reverse order !=0 1316 | if(end0pos == 0) { 1317 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); 1318 | return DU[0]; 1319 | } 1320 | for(i = 1; i <= end0pos; ++i) { 1321 | int startpos = i; 1322 | int nrzeroes; 1323 | unsigned short bits[2]; 1324 | for (; DU[i]==0 && i<=end0pos; ++i) { 1325 | } 1326 | nrzeroes = i-startpos; 1327 | if ( nrzeroes >= 16 ) { 1328 | int lng = nrzeroes>>4; 1329 | int nrmarker; 1330 | for (nrmarker=1; nrmarker <= lng; ++nrmarker) 1331 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, M16zeroes); 1332 | nrzeroes &= 15; 1333 | } 1334 | stbiw__jpg_calcBits(DU[i], bits); 1335 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, HTAC[(nrzeroes<<4)+bits[1]]); 1336 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, bits); 1337 | } 1338 | if(end0pos != 63) { 1339 | stbiw__jpg_writeBits(s, bitBuf, bitCnt, EOB); 1340 | } 1341 | return DU[0]; 1342 | } 1343 | 1344 | static int stbi_write_jpg_core(stbi__write_context *s, int width, int height, int comp, const void* data, int quality) { 1345 | // Constants that don't pollute global namespace 1346 | static const unsigned char std_dc_luminance_nrcodes[] = {0,0,1,5,1,1,1,1,1,1,0,0,0,0,0,0,0}; 1347 | static const unsigned char std_dc_luminance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; 1348 | static const unsigned char std_ac_luminance_nrcodes[] = {0,0,2,1,3,3,2,4,3,5,5,4,4,0,0,1,0x7d}; 1349 | static const unsigned char std_ac_luminance_values[] = { 1350 | 0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,0x41,0x06,0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,0x81,0x91,0xa1,0x08, 1351 | 0x23,0x42,0xb1,0xc1,0x15,0x52,0xd1,0xf0,0x24,0x33,0x62,0x72,0x82,0x09,0x0a,0x16,0x17,0x18,0x19,0x1a,0x25,0x26,0x27,0x28, 1352 | 0x29,0x2a,0x34,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58,0x59, 1353 | 0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x83,0x84,0x85,0x86,0x87,0x88,0x89, 1354 | 0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4,0xb5,0xb6, 1355 | 0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda,0xe1,0xe2, 1356 | 0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf1,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa 1357 | }; 1358 | static const unsigned char std_dc_chrominance_nrcodes[] = {0,0,3,1,1,1,1,1,1,1,1,1,0,0,0,0,0}; 1359 | static const unsigned char std_dc_chrominance_values[] = {0,1,2,3,4,5,6,7,8,9,10,11}; 1360 | static const unsigned char std_ac_chrominance_nrcodes[] = {0,0,2,1,2,4,4,3,4,7,5,4,4,0,1,2,0x77}; 1361 | static const unsigned char std_ac_chrominance_values[] = { 1362 | 0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,0x12,0x41,0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,0x08,0x14,0x42,0x91, 1363 | 0xa1,0xb1,0xc1,0x09,0x23,0x33,0x52,0xf0,0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26, 1364 | 0x27,0x28,0x29,0x2a,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,0x57,0x58, 1365 | 0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,0x82,0x83,0x84,0x85,0x86,0x87, 1366 | 0x88,0x89,0x8a,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xa2,0xa3,0xa4,0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xb2,0xb3,0xb4, 1367 | 0xb5,0xb6,0xb7,0xb8,0xb9,0xba,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd9,0xda, 1368 | 0xe2,0xe3,0xe4,0xe5,0xe6,0xe7,0xe8,0xe9,0xea,0xf2,0xf3,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa 1369 | }; 1370 | // Huffman tables 1371 | static const unsigned short YDC_HT[256][2] = { {0,2},{2,3},{3,3},{4,3},{5,3},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9}}; 1372 | static const unsigned short UVDC_HT[256][2] = { {0,2},{1,2},{2,2},{6,3},{14,4},{30,5},{62,6},{126,7},{254,8},{510,9},{1022,10},{2046,11}}; 1373 | static const unsigned short YAC_HT[256][2] = { 1374 | {10,4},{0,2},{1,2},{4,3},{11,4},{26,5},{120,7},{248,8},{1014,10},{65410,16},{65411,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1375 | {12,4},{27,5},{121,7},{502,9},{2038,11},{65412,16},{65413,16},{65414,16},{65415,16},{65416,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1376 | {28,5},{249,8},{1015,10},{4084,12},{65417,16},{65418,16},{65419,16},{65420,16},{65421,16},{65422,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1377 | {58,6},{503,9},{4085,12},{65423,16},{65424,16},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1378 | {59,6},{1016,10},{65430,16},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1379 | {122,7},{2039,11},{65438,16},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1380 | {123,7},{4086,12},{65446,16},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1381 | {250,8},{4087,12},{65454,16},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1382 | {504,9},{32704,15},{65462,16},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1383 | {505,9},{65470,16},{65471,16},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1384 | {506,9},{65479,16},{65480,16},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1385 | {1017,10},{65488,16},{65489,16},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1386 | {1018,10},{65497,16},{65498,16},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1387 | {2040,11},{65506,16},{65507,16},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1388 | {65515,16},{65516,16},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{0,0},{0,0},{0,0},{0,0},{0,0}, 1389 | {2041,11},{65525,16},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0} 1390 | }; 1391 | static const unsigned short UVAC_HT[256][2] = { 1392 | {0,2},{1,2},{4,3},{10,4},{24,5},{25,5},{56,6},{120,7},{500,9},{1014,10},{4084,12},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1393 | {11,4},{57,6},{246,8},{501,9},{2038,11},{4085,12},{65416,16},{65417,16},{65418,16},{65419,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1394 | {26,5},{247,8},{1015,10},{4086,12},{32706,15},{65420,16},{65421,16},{65422,16},{65423,16},{65424,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1395 | {27,5},{248,8},{1016,10},{4087,12},{65425,16},{65426,16},{65427,16},{65428,16},{65429,16},{65430,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1396 | {58,6},{502,9},{65431,16},{65432,16},{65433,16},{65434,16},{65435,16},{65436,16},{65437,16},{65438,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1397 | {59,6},{1017,10},{65439,16},{65440,16},{65441,16},{65442,16},{65443,16},{65444,16},{65445,16},{65446,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1398 | {121,7},{2039,11},{65447,16},{65448,16},{65449,16},{65450,16},{65451,16},{65452,16},{65453,16},{65454,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1399 | {122,7},{2040,11},{65455,16},{65456,16},{65457,16},{65458,16},{65459,16},{65460,16},{65461,16},{65462,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1400 | {249,8},{65463,16},{65464,16},{65465,16},{65466,16},{65467,16},{65468,16},{65469,16},{65470,16},{65471,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1401 | {503,9},{65472,16},{65473,16},{65474,16},{65475,16},{65476,16},{65477,16},{65478,16},{65479,16},{65480,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1402 | {504,9},{65481,16},{65482,16},{65483,16},{65484,16},{65485,16},{65486,16},{65487,16},{65488,16},{65489,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1403 | {505,9},{65490,16},{65491,16},{65492,16},{65493,16},{65494,16},{65495,16},{65496,16},{65497,16},{65498,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1404 | {506,9},{65499,16},{65500,16},{65501,16},{65502,16},{65503,16},{65504,16},{65505,16},{65506,16},{65507,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1405 | {2041,11},{65508,16},{65509,16},{65510,16},{65511,16},{65512,16},{65513,16},{65514,16},{65515,16},{65516,16},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}, 1406 | {16352,14},{65517,16},{65518,16},{65519,16},{65520,16},{65521,16},{65522,16},{65523,16},{65524,16},{65525,16},{0,0},{0,0},{0,0},{0,0},{0,0}, 1407 | {1018,10},{32707,15},{65526,16},{65527,16},{65528,16},{65529,16},{65530,16},{65531,16},{65532,16},{65533,16},{65534,16},{0,0},{0,0},{0,0},{0,0},{0,0} 1408 | }; 1409 | static const int YQT[] = {16,11,10,16,24,40,51,61,12,12,14,19,26,58,60,55,14,13,16,24,40,57,69,56,14,17,22,29,51,87,80,62,18,22, 1410 | 37,56,68,109,103,77,24,35,55,64,81,104,113,92,49,64,78,87,103,121,120,101,72,92,95,98,112,100,103,99}; 1411 | static const int UVQT[] = {17,18,24,47,99,99,99,99,18,21,26,66,99,99,99,99,24,26,56,99,99,99,99,99,47,66,99,99,99,99,99,99, 1412 | 99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99}; 1413 | static const float aasf[] = { 1.0f * 2.828427125f, 1.387039845f * 2.828427125f, 1.306562965f * 2.828427125f, 1.175875602f * 2.828427125f, 1414 | 1.0f * 2.828427125f, 0.785694958f * 2.828427125f, 0.541196100f * 2.828427125f, 0.275899379f * 2.828427125f }; 1415 | 1416 | int row, col, i, k; 1417 | float fdtbl_Y[64], fdtbl_UV[64]; 1418 | unsigned char YTable[64], UVTable[64]; 1419 | 1420 | if(!data || !width || !height || comp > 4 || comp < 1) { 1421 | return 0; 1422 | } 1423 | 1424 | quality = quality ? quality : 90; 1425 | quality = quality < 1 ? 1 : quality > 100 ? 100 : quality; 1426 | quality = quality < 50 ? 5000 / quality : 200 - quality * 2; 1427 | 1428 | for(i = 0; i < 64; ++i) { 1429 | int uvti, yti = (YQT[i]*quality+50)/100; 1430 | YTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (yti < 1 ? 1 : yti > 255 ? 255 : yti); 1431 | uvti = (UVQT[i]*quality+50)/100; 1432 | UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (uvti < 1 ? 1 : uvti > 255 ? 255 : uvti); 1433 | } 1434 | 1435 | for(row = 0, k = 0; row < 8; ++row) { 1436 | for(col = 0; col < 8; ++col, ++k) { 1437 | fdtbl_Y[k] = 1 / (YTable [stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); 1438 | fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); 1439 | } 1440 | } 1441 | 1442 | // Write Headers 1443 | { 1444 | static const unsigned char head0[] = { 0xFF,0xD8,0xFF,0xE0,0,0x10,'J','F','I','F',0,1,1,0,0,1,0,1,0,0,0xFF,0xDB,0,0x84,0 }; 1445 | static const unsigned char head2[] = { 0xFF,0xDA,0,0xC,3,1,0,2,0x11,3,0x11,0,0x3F,0 }; 1446 | const unsigned char head1[] = { 0xFF,0xC0,0,0x11,8,(unsigned char)(height>>8),STBIW_UCHAR(height),(unsigned char)(width>>8),STBIW_UCHAR(width), 1447 | 3,1,0x11,0,2,0x11,1,3,0x11,1,0xFF,0xC4,0x01,0xA2,0 }; 1448 | s->func(s->context, (void*)head0, sizeof(head0)); 1449 | s->func(s->context, (void*)YTable, sizeof(YTable)); 1450 | stbiw__putc(s, 1); 1451 | s->func(s->context, UVTable, sizeof(UVTable)); 1452 | s->func(s->context, (void*)head1, sizeof(head1)); 1453 | s->func(s->context, (void*)(std_dc_luminance_nrcodes+1), sizeof(std_dc_luminance_nrcodes)-1); 1454 | s->func(s->context, (void*)std_dc_luminance_values, sizeof(std_dc_luminance_values)); 1455 | stbiw__putc(s, 0x10); // HTYACinfo 1456 | s->func(s->context, (void*)(std_ac_luminance_nrcodes+1), sizeof(std_ac_luminance_nrcodes)-1); 1457 | s->func(s->context, (void*)std_ac_luminance_values, sizeof(std_ac_luminance_values)); 1458 | stbiw__putc(s, 1); // HTUDCinfo 1459 | s->func(s->context, (void*)(std_dc_chrominance_nrcodes+1), sizeof(std_dc_chrominance_nrcodes)-1); 1460 | s->func(s->context, (void*)std_dc_chrominance_values, sizeof(std_dc_chrominance_values)); 1461 | stbiw__putc(s, 0x11); // HTUACinfo 1462 | s->func(s->context, (void*)(std_ac_chrominance_nrcodes+1), sizeof(std_ac_chrominance_nrcodes)-1); 1463 | s->func(s->context, (void*)std_ac_chrominance_values, sizeof(std_ac_chrominance_values)); 1464 | s->func(s->context, (void*)head2, sizeof(head2)); 1465 | } 1466 | 1467 | // Encode 8x8 macroblocks 1468 | { 1469 | static const unsigned short fillBits[] = {0x7F, 7}; 1470 | const unsigned char *imageData = (const unsigned char *)data; 1471 | int DCY=0, DCU=0, DCV=0; 1472 | int bitBuf=0, bitCnt=0; 1473 | // comp == 2 is grey+alpha (alpha is ignored) 1474 | int ofsG = comp > 2 ? 1 : 0, ofsB = comp > 2 ? 2 : 0; 1475 | int x, y, pos; 1476 | for(y = 0; y < height; y += 8) { 1477 | for(x = 0; x < width; x += 8) { 1478 | float YDU[64], UDU[64], VDU[64]; 1479 | for(row = y, pos = 0; row < y+8; ++row) { 1480 | // row >= height => use last input row 1481 | int clamped_row = (row < height) ? row : height - 1; 1482 | int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp; 1483 | for(col = x; col < x+8; ++col, ++pos) { 1484 | float r, g, b; 1485 | // if col >= width => use pixel from last input column 1486 | int p = base_p + ((col < width) ? col : (width-1))*comp; 1487 | 1488 | r = imageData[p+0]; 1489 | g = imageData[p+ofsG]; 1490 | b = imageData[p+ofsB]; 1491 | YDU[pos]=+0.29900f*r+0.58700f*g+0.11400f*b-128; 1492 | UDU[pos]=-0.16874f*r-0.33126f*g+0.50000f*b; 1493 | VDU[pos]=+0.50000f*r-0.41869f*g-0.08131f*b; 1494 | } 1495 | } 1496 | 1497 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, YDU, fdtbl_Y, DCY, YDC_HT, YAC_HT); 1498 | DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, UDU, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); 1499 | DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, VDU, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); 1500 | } 1501 | } 1502 | 1503 | // Do the bit alignment of the EOI marker 1504 | stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits); 1505 | } 1506 | 1507 | // EOI 1508 | stbiw__putc(s, 0xFF); 1509 | stbiw__putc(s, 0xD9); 1510 | 1511 | return 1; 1512 | } 1513 | 1514 | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality) 1515 | { 1516 | stbi__write_context s; 1517 | stbi__start_write_callbacks(&s, func, context); 1518 | return stbi_write_jpg_core(&s, x, y, comp, (void *) data, quality); 1519 | } 1520 | 1521 | 1522 | #ifndef STBI_WRITE_NO_STDIO 1523 | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality) 1524 | { 1525 | stbi__write_context s; 1526 | if (stbi__start_write_file(&s,filename)) { 1527 | int r = stbi_write_jpg_core(&s, x, y, comp, data, quality); 1528 | stbi__end_write_file(&s); 1529 | return r; 1530 | } else 1531 | return 0; 1532 | } 1533 | #endif 1534 | 1535 | #endif // STB_IMAGE_WRITE_IMPLEMENTATION 1536 | 1537 | /* Revision history 1538 | 1.10 (2019-02-07) 1539 | support utf8 filenames in Windows; fix warnings and platform ifdefs 1540 | 1.09 (2018-02-11) 1541 | fix typo in zlib quality API, improve STB_I_W_STATIC in C++ 1542 | 1.08 (2018-01-29) 1543 | add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter 1544 | 1.07 (2017-07-24) 1545 | doc fix 1546 | 1.06 (2017-07-23) 1547 | writing JPEG (using Jon Olick's code) 1548 | 1.05 ??? 1549 | 1.04 (2017-03-03) 1550 | monochrome BMP expansion 1551 | 1.03 ??? 1552 | 1.02 (2016-04-02) 1553 | avoid allocating large structures on the stack 1554 | 1.01 (2016-01-16) 1555 | STBIW_REALLOC_SIZED: support allocators with no realloc support 1556 | avoid race-condition in crc initialization 1557 | minor compile issues 1558 | 1.00 (2015-09-14) 1559 | installable file IO function 1560 | 0.99 (2015-09-13) 1561 | warning fixes; TGA rle support 1562 | 0.98 (2015-04-08) 1563 | added STBIW_MALLOC, STBIW_ASSERT etc 1564 | 0.97 (2015-01-18) 1565 | fixed HDR asserts, rewrote HDR rle logic 1566 | 0.96 (2015-01-17) 1567 | add HDR output 1568 | fix monochrome BMP 1569 | 0.95 (2014-08-17) 1570 | add monochrome TGA output 1571 | 0.94 (2014-05-31) 1572 | rename private functions to avoid conflicts with stb_image.h 1573 | 0.93 (2014-05-27) 1574 | warning fixes 1575 | 0.92 (2010-08-01) 1576 | casts to unsigned char to fix warnings 1577 | 0.91 (2010-07-17) 1578 | first public release 1579 | 0.90 first internal release 1580 | */ 1581 | 1582 | /* 1583 | ------------------------------------------------------------------------------ 1584 | This software is available under 2 licenses -- choose whichever you prefer. 1585 | ------------------------------------------------------------------------------ 1586 | ALTERNATIVE A - MIT License 1587 | Copyright (c) 2017 Sean Barrett 1588 | Permission is hereby granted, free of charge, to any person obtaining a copy of 1589 | this software and associated documentation files (the "Software"), to deal in 1590 | the Software without restriction, including without limitation the rights to 1591 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 1592 | of the Software, and to permit persons to whom the Software is furnished to do 1593 | so, subject to the following conditions: 1594 | The above copyright notice and this permission notice shall be included in all 1595 | copies or substantial portions of the Software. 1596 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1597 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1598 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 1599 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 1600 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 1601 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 1602 | SOFTWARE. 1603 | ------------------------------------------------------------------------------ 1604 | ALTERNATIVE B - Public Domain (www.unlicense.org) 1605 | This is free and unencumbered software released into the public domain. 1606 | Anyone is free to copy, modify, publish, use, compile, sell, or distribute this 1607 | software, either in source code form or as a compiled binary, for any purpose, 1608 | commercial or non-commercial, and by any means. 1609 | In jurisdictions that recognize copyright laws, the author or authors of this 1610 | software dedicate any and all copyright interest in the software to the public 1611 | domain. We make this dedication for the benefit of the public at large and to 1612 | the detriment of our heirs and successors. We intend this dedication to be an 1613 | overt act of relinquishment in perpetuity of all present and future rights to 1614 | this software under copyright law. 1615 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1616 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1617 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 1618 | AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 1619 | ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 1620 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 1621 | ------------------------------------------------------------------------------ 1622 | */ 1623 | -------------------------------------------------------------------------------- /src/c/png/zero.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #define STB_IMAGE_WRITE_IMPLEMENTATION 3 | #include "stb_image_write.h" 4 | 5 | void zero_open(char *title, int w, int h, int d, int s); 6 | int zero_update(void *fb, void *pal); 7 | void zero_close() {}; 8 | 9 | #define MAKE_RGB(r,g,b) (((b)<<16) | ((g)<<8) | (r)) 10 | #define MAKE_RGBA(r,g,b,a) (((a)<<24) | ((b)<<16) | ((g)<<8) | (r)) 11 | #define GET_RED(c) (((c)>>16) & 0x000000FF) 12 | #define GET_GREEN(c) (((c)>>8) & 0x000000FF) 13 | #define GET_BLUE(c) ((c) & 0x000000FF) 14 | #define GET_ALPHA(c) (((c)>>24) & 0x000000FF) 15 | 16 | // IMPLEMENTATION 17 | 18 | static int width, height, depth, scale; 19 | static void *active_palette; 20 | static char filename[1000]; 21 | 22 | void zero_open(char *title, int w, int h, int d, int s){ 23 | width = w <= 0 ? 1 : w; 24 | height= h <= 0 ? 1 : h; 25 | depth = d == 1 ? 1 : (d == 4 ? 4 : 3); 26 | scale = s <= 0 ? 1 : s; 27 | int i = 0; 28 | while(title[i]) { 29 | filename[i] = title[i]; 30 | i++; 31 | } 32 | filename[i] = 0; 33 | } 34 | 35 | int zero_update(void *fb, void *pal){ 36 | void *fb_indexed = 0; 37 | void *fb_scaled = 0; 38 | void *frame = fb; 39 | active_palette = pal ? pal : active_palette; 40 | int final_depth = depth == 1 ? 4 : depth; 41 | 42 | if (depth == 1 && active_palette) { 43 | unsigned char idx; 44 | unsigned char *palette = (unsigned char *)active_palette; 45 | unsigned int color; 46 | fb_indexed = malloc(width * height * final_depth); 47 | for (int i = 0; i < width * height; i++) { 48 | idx = ((unsigned char*)fb)[i]; 49 | color = MAKE_RGBA( 50 | palette[idx * 3 + 0], 51 | palette[idx * 3 + 1], 52 | palette[idx * 3 + 2], 53 | 255); 54 | ((unsigned int *)fb_indexed)[i] = color; 55 | } 56 | frame = fb_indexed; 57 | } 58 | 59 | if (scale > 1) { 60 | int from, to; 61 | fb_scaled = malloc(width * scale * height * scale * final_depth); 62 | for (int y = 0; y < height * scale; y++) { 63 | for (int x = 0; x < width * scale; x++) { 64 | from = y / scale * width + x / scale; 65 | to = y * width * scale + x; 66 | if (final_depth == 3) { 67 | ((unsigned char*)fb_scaled)[to * 3 + 0] = ((unsigned char*)frame)[from * 3 + 0]; 68 | ((unsigned char*)fb_scaled)[to * 3 + 1] = ((unsigned char*)frame)[from * 3 + 1]; 69 | ((unsigned char*)fb_scaled)[to * 3 + 2] = ((unsigned char*)frame)[from * 3 + 2]; 70 | } else { 71 | ((unsigned int *)fb_scaled)[to] = ((unsigned int *)frame)[from]; 72 | } 73 | } 74 | } 75 | frame = fb_scaled; 76 | } 77 | 78 | int result = stbi_write_png(filename, width * scale, height * scale, final_depth, frame, 0); 79 | 80 | if (fb_indexed) free(fb_indexed); 81 | if (fb_scaled) free(fb_scaled); 82 | return result; 83 | } 84 | 85 | -------------------------------------------------------------------------------- /src/c/readme.md: -------------------------------------------------------------------------------- 1 | 2 | # C implementation 3 | 4 | ## Palette 5 | 6 | `int zero_update(framebuffer, palette);` 7 | 8 | To avoid unnecessary updates of the palette on each frame, if `palette` is NULL 9 | the latest palette submitted will be used. *But remember to send one on the first frame!* 10 | 11 | ## Types 12 | 13 | 14 | #### Indexed mode 15 | ``` 16 | unsigned char framebuffer [W * H]; 17 | unsigned char palette [256 * 3]; // RGBRGBRGB... 18 | ``` 19 | #### RGB mode 20 | ``` 21 | unsigned char framebuffer [W * H * 3]; // RGB RGB RGB... 22 | ``` 23 | 24 | #### RGBA mode 25 | ``` 26 | unsigned char framebuffer [W * H * 4]; // RGBA RGBA RGBA... 27 | ``` 28 | or 29 | ``` 30 | unsigned int framebuffer [W * H]; // RGBA RGBA RGBA... 31 | ``` 32 | -------------------------------------------------------------------------------- /src/c/wingdi/examples/indexed.c: -------------------------------------------------------------------------------- 1 | #define FPS_COUNTER 2 | #include "../zero.h" 3 | 4 | void main(void) { 5 | unsigned char fb [256 * 256]; 6 | unsigned char pal[256 * 3]; 7 | 8 | for(int i = 0; i < 256; i++){ 9 | pal[i * 3 + 0] = i / 2 + 128; 10 | pal[i * 3 + 1] = i / 2; 11 | pal[i * 3 + 2] = 255 - i; 12 | } 13 | 14 | for(int y = 0; y < 256; y++) { 15 | for(int x = 0; x < 256; x++) { 16 | fb[y * 256 + x] = x; 17 | } 18 | } 19 | 20 | zero_open("Zero wingdi - Indexed example", 256, 256, 1, 2); 21 | zero_update(fb, pal); 22 | 23 | unsigned char r, g, b, frame = 0; 24 | 25 | while(1) { 26 | if (frame % 30 == 0) { 27 | r = pal[0]; 28 | g = pal[1]; 29 | b = pal[2]; 30 | for(int i = 0; i < 255 * 3; i++){ 31 | pal[i] = pal[i + 3]; 32 | } 33 | pal[255 * 3 + 0] = r; 34 | pal[255 * 3 + 1] = g; 35 | pal[255 * 3 + 2] = b; 36 | zero_update(fb, pal); 37 | } else { 38 | zero_update(fb, NULL); 39 | } 40 | 41 | frame ++; 42 | } 43 | } 44 | 45 | -------------------------------------------------------------------------------- /src/c/wingdi/examples/indexed.exe: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/wingdi/examples/indexed.exe -------------------------------------------------------------------------------- /src/c/wingdi/examples/make.bat: -------------------------------------------------------------------------------- 1 | set COMPILER_OPTS=/Ot /Ze 2 | set LINKER_OPTS=/subsystem:windows /machine:x64 kernel32.lib user32.lib gdi32.lib comctl32.lib comdlg32.lib advapi32.lib delayimp64.lib 3 | cc %COMPILER_OPTS% rgb.c %LINKER_OPTS% 4 | cc %COMPILER_OPTS% noise.c %LINKER_OPTS% 5 | cc %COMPILER_OPTS% indexed.c %LINKER_OPTS% 6 | del *.obj 7 | -------------------------------------------------------------------------------- /src/c/wingdi/examples/noise.c: -------------------------------------------------------------------------------- 1 | #define FPS_COUNTER 2 | #include "../zero.h" 3 | 4 | #define makeRGB(r,g,b) (((r)<<16) | ((g)<<8) | (b)) 5 | 6 | int fb[256 * 256]; 7 | 8 | static int noise; 9 | static int carry; 10 | static int seed = 0x12345; 11 | 12 | void main(void) { 13 | 14 | zero_open("Zero wingdi - Noise example", 256, 256, 3, 2); 15 | 16 | int *p; 17 | int i; 18 | while(1) { 19 | p = fb; 20 | for(i = 0; i < 256 * 256; i++) { 21 | noise = seed; 22 | noise >>= 3; 23 | noise ^= seed; 24 | carry = noise & 1; 25 | noise >>= 1; 26 | seed >>= 1; 27 | seed |= (carry << 30); 28 | noise &= 0xFF; 29 | 30 | *p = makeRGB(noise, noise, noise); 31 | p++; 32 | } 33 | zero_update(fb, NULL); 34 | } 35 | } 36 | 37 | -------------------------------------------------------------------------------- /src/c/wingdi/examples/noise.exe: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/wingdi/examples/noise.exe -------------------------------------------------------------------------------- /src/c/wingdi/examples/rgb.c: -------------------------------------------------------------------------------- 1 | #include "../zero.h" 2 | 3 | 4 | int fb[256 * 256]; 5 | 6 | void main(void) { 7 | int *p = fb; 8 | 9 | for(int y = 0; y < 256; y++) { 10 | for(int x = 0; x < 256; x++) { 11 | *p = MAKE_RGB(y, x, 255 - x); 12 | p++; 13 | } 14 | } 15 | 16 | zero_open("Zero wingdi - RGB example", 256, 256, 3, 2); 17 | 18 | while(1) { 19 | zero_update(fb, NULL); 20 | } 21 | } 22 | 23 | -------------------------------------------------------------------------------- /src/c/wingdi/examples/rgb.exe: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/feiss/zero/c3c877954ed091b11851bc0329da5d0c0ae86075/src/c/wingdi/examples/rgb.exe -------------------------------------------------------------------------------- /src/c/wingdi/zero.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | // Most code was taken from tinyptc library 3 | // https://sourceforge.net/projects/tinyptc/ 4 | 5 | void zero_open(char *title, int w, int h, int d, int s); 6 | int zero_update(void *fb, void *pal); 7 | void zero_close() {}; 8 | 9 | #define MAKE_RGB(r,g,b) (((r)<<16) | ((g)<<8) | (b)) 10 | 11 | // IMPLEMENTATION 12 | #define WIN32_LEAN_AND_MEAN 13 | #include 14 | 15 | HDC hdc; 16 | static int width, height, depth, scale; 17 | static HWND wnd; 18 | static WNDCLASS wc; 19 | static void *active_fb = 0; 20 | static void *active_pal = 0; 21 | static BITMAPINFO *bitmap_header; 22 | static char bitmapbuffer[sizeof(BITMAPINFO) + 16 + 256 * 4]; 23 | 24 | #ifdef FPS_COUNTER 25 | #include 26 | static LARGE_INTEGER frequency; 27 | static LARGE_INTEGER t1, t2; 28 | static double elapsedTime; 29 | char window_title_fps[50]; 30 | #endif 31 | 32 | static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) 33 | { 34 | int result = 0; 35 | switch (message) 36 | { 37 | case WM_PAINT: 38 | if (active_fb != 0) { 39 | StretchDIBits(hdc, 40 | 0, 0, 41 | width * scale, 42 | height * scale, 43 | 0, 0, 44 | width, height, 45 | active_fb, bitmap_header, 46 | DIB_RGB_COLORS, 47 | SRCCOPY); 48 | ValidateRect(wnd, NULL); 49 | } 50 | break; 51 | case WM_CLOSE: 52 | active_fb = 0; 53 | ReleaseDC(wnd, hdc); 54 | DestroyWindow(wnd); 55 | ExitProcess(0); 56 | break; 57 | default: 58 | result = DefWindowProc(hWnd, message, wParam, lParam); 59 | break; 60 | } 61 | return result; 62 | } 63 | 64 | void zero_open(char *title, int w, int h, int d, int s) 65 | { 66 | RECT rect; 67 | scale = s; 68 | 69 | wc.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW; 70 | wc.lpfnWndProc = WndProc; 71 | wc.cbClsExtra = 0; 72 | wc.cbWndExtra = 0; 73 | 74 | // app icon 75 | // wc.hInstance = GetModuleHandle(0); 76 | // wc.hIcon = LoadIcon(wc.hInstance, __PTC_ICON__); 77 | 78 | // no icon 79 | wc.hInstance = 0; 80 | wc.hIcon = NULL; 81 | 82 | wc.hCursor = LoadCursor(0, IDC_ARROW); 83 | wc.hbrBackground = NULL; 84 | wc.lpszMenuName = NULL; 85 | wc.lpszClassName = title; 86 | RegisterClass(&wc); 87 | 88 | rect.left = 0; 89 | rect.top = 0; 90 | rect.right = w * s; 91 | rect.bottom = h * s; 92 | 93 | AdjustWindowRect(&rect, WS_POPUP|WS_SYSMENU|WS_CAPTION, 0); 94 | rect.right -= rect.left; 95 | rect.bottom -= rect.top; 96 | 97 | width = w; 98 | height = h; 99 | depth = d == 1 ? 1 : 4; 100 | 101 | int posx = (GetSystemMetrics(SM_CXSCREEN) - rect.right) >> 1; 102 | int posy = (GetSystemMetrics(SM_CYSCREEN) - rect.bottom) >> 1; 103 | 104 | wnd = CreateWindowEx(0, title, title, WS_OVERLAPPEDWINDOW & ~WS_MAXIMIZEBOX & ~WS_THICKFRAME, posx, posy, rect.right, rect.bottom, 0, 0, 0, 0); 105 | ShowWindow(wnd, SW_NORMAL); 106 | 107 | for (int cc = 0; cc < sizeof(BITMAPINFOHEADER)+ 16 + 256 * 4; cc++) bitmapbuffer[cc] = 0; 108 | bitmap_header = (BITMAPINFO *)&bitmapbuffer; 109 | bitmap_header->bmiHeader.biSize = sizeof(BITMAPINFOHEADER); 110 | bitmap_header->bmiHeader.biPlanes = 1; 111 | bitmap_header->bmiHeader.biBitCount = depth * 8; 112 | bitmap_header->bmiHeader.biCompression = depth == 1 ? BI_RGB : BI_BITFIELDS; 113 | bitmap_header->bmiHeader.biWidth = width; 114 | bitmap_header->bmiHeader.biHeight = -height; 115 | if (depth != 1) { 116 | ((unsigned long *)bitmap_header->bmiColors)[0] = 0x00FF0000; 117 | ((unsigned long *)bitmap_header->bmiColors)[1] = 0x0000FF00; 118 | ((unsigned long *)bitmap_header->bmiColors)[2] = 0x000000FF; 119 | } 120 | hdc = GetDC(wnd); 121 | 122 | #ifdef FPS_COUNTER 123 | QueryPerformanceFrequency(&frequency); 124 | QueryPerformanceCounter(&t1); 125 | #endif 126 | } 127 | 128 | int zero_update(void *fb, void *pal) 129 | { 130 | MSG message; 131 | active_fb = fb; 132 | active_pal = pal ? pal : active_pal; 133 | 134 | if (pal) { 135 | RGBQUAD* palette = &bitmap_header->bmiColors[0]; 136 | RGBQUAD rgb = {0, 0, 0, 0}; 137 | BYTE *pal8 = (BYTE *)pal; 138 | for (int i = 0; i < 256; i++) 139 | { 140 | rgb.rgbRed = pal8[i * 3 + 0]; 141 | rgb.rgbGreen = pal8[i * 3 + 1]; 142 | rgb.rgbBlue = pal8[i * 3 + 2]; 143 | palette[i] = rgb; 144 | } 145 | } 146 | 147 | InvalidateRect(wnd, NULL, TRUE); 148 | SendMessage(wnd, WM_PAINT, 0, 0); 149 | while (PeekMessage(&message, wnd, 0, 0, PM_REMOVE)) 150 | { 151 | TranslateMessage(&message); 152 | DispatchMessage(&message); 153 | } 154 | Sleep(0); 155 | 156 | #ifdef FPS_COUNTER 157 | QueryPerformanceCounter(&t2); 158 | elapsedTime = (float)(t2.QuadPart-t1.QuadPart)/frequency.QuadPart; 159 | sprintf(window_title_fps, "%.1ffps", 1.0/elapsedTime); 160 | SetWindowTextA(wnd, window_title_fps); 161 | t1 = t2; 162 | #endif 163 | 164 | return 1; 165 | } 166 | 167 | extern void main(); 168 | void WinMainCRTStartup(void) { 169 | main(); 170 | } 171 | -------------------------------------------------------------------------------- /src/js/canvas/examples/indexed.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Zero canvas - Indexed example 6 | 7 | 8 | 9 |
10 | 31 | 32 | 33 | 34 | -------------------------------------------------------------------------------- /src/js/canvas/examples/noise.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Zero canvas - Noise example 6 | 7 | 8 | 9 |
10 | 37 | 38 | 39 | 40 | -------------------------------------------------------------------------------- /src/js/canvas/examples/rgb.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Zero canvas - RGB example 6 | 7 | 8 | 9 |
10 | 27 | 28 | 29 | 30 | -------------------------------------------------------------------------------- /src/js/canvas/zero.js: -------------------------------------------------------------------------------- 1 | 2 | var _z = {}; 3 | 4 | const RESIZE = 1; 5 | const KEY_DOWN = 2; 6 | const KEY_UP = 3; 7 | const MOUSE_DOWN = 4; 8 | const MOUSE_UP = 5; 9 | const MOUSE_MOVE = 6; 10 | const MOUSE_LEAVE = 7; 11 | const MOUSE_ENTER = 8; 12 | 13 | const SHIFT = 1; 14 | const CONTROL = 2; 15 | const ALT = 4; 16 | const SUPER = 8; 17 | 18 | const MOUSE_LEFT = 0; 19 | const MOUSE_RIGHT = 1; 20 | const MOUSE_MIDDLE = 2; 21 | 22 | function zero_open(el, w, h, d, s) { 23 | var canvas = document.createElement('canvas'); 24 | var dirtyCanvas = document.createElement('canvas'); 25 | document.querySelector(el).appendChild(canvas); 26 | 27 | canvas.width = w * s; 28 | canvas.height = h * s; 29 | _z.ctx = canvas.getContext('2d'); 30 | _z.ctx.imageSmoothingEnabled = false; 31 | 32 | dirtyCanvas.width = w; 33 | dirtyCanvas.height = h; 34 | _z.dirtyCtx = dirtyCanvas.getContext('2d'); 35 | _z.dirtyCtx.imageSmoothingEnabled = false; 36 | 37 | _z.dirtyImdata = _z.ctx.createImageData(w, h); 38 | 39 | if (d == 1) { 40 | _z.dirtyImdataIndexed = _z.ctx.createImageData(w / 2, h / 2); 41 | return _z.dirtyImdataIndexed; 42 | } 43 | 44 | return _z.dirtyImdata; 45 | } 46 | 47 | function zero_update(fb, pal) { 48 | const canvas = _z.ctx.canvas; 49 | var idx; 50 | if (pal) { 51 | var data = _z.dirtyImdata.data; 52 | for (var i = 0, j = 0; i < data.length; i += 4, j++) { 53 | idx = fb.data[j]; 54 | data[i + 0] = pal[idx * 3 + 0]; 55 | data[i + 1] = pal[idx * 3 + 1]; 56 | data[i + 2] = pal[idx * 3 + 2]; 57 | data[i + 3] = 255; 58 | }; 59 | _z.dirtyCtx.putImageData(_z.dirtyImdata, 0, 0); 60 | } else { 61 | _z.dirtyCtx.putImageData(fb, 0, 0); 62 | } 63 | _z.ctx.drawImage(_z.dirtyCtx.canvas, 0, 0, canvas.width, canvas.height); 64 | } 65 | 66 | function zero_close() {} 67 | 68 | function zero_events(handler){ 69 | if (_z.handler) { 70 | _z.ctx.canvas.removeEventListener('mousedown', __mouse_handler); 71 | _z.ctx.canvas.removeEventListener('mouseup', __mouse_handler); 72 | _z.ctx.canvas.removeEventListener('mousemove', __mouse_handler); 73 | document.body.removeEventListener('keydown', __key_handler); 74 | document.body.removeEventListener('keyup', __key_handler); 75 | window.removeEventListener('resize', __resize_handler); 76 | } 77 | 78 | _z.handler = handler; 79 | _z.ctx.canvas.addEventListener('mousedown', __mouse_handler); 80 | _z.ctx.canvas.addEventListener('mouseup', __mouse_handler); 81 | _z.ctx.canvas.addEventListener('mousemove', __mouse_handler); 82 | document.body.addEventListener('keydown', __key_handler); 83 | document.body.addEventListener('keyup', __key_handler); 84 | window.addEventListener('resize', __resize_handler); 85 | } 86 | 87 | function __mouse_handler (evt) { 88 | const MAP_BUTTON = [0, 2, 1]; 89 | var type = {'mousedown': MOUSE_DOWN, 'mouseup': MOUSE_UP, 'mousemove': MOUSE_MOVE}[evt.type]; 90 | if (type === undefined) return; 91 | let param1 = type === MOUSE_MOVE ? evt.offsetX : MAP_BUTTON[evt.button]; 92 | let param2 = type === MOUSE_MOVE ? evt.offsetY : MAP_BUTTON[evt.button]; 93 | _z.handler(type, param1, param2); 94 | } 95 | 96 | function __key_handler (evt) { 97 | const modifiers = evt.metaKey << 3 | evt.altKey << 2 | evt.controlKey << 1 | evt.shiftKey; 98 | _z.handler(evt.type === 'keydown' ? KEY_DOWN : KEY_UP, evt.keyCode, modifiers); 99 | } 100 | 101 | function __resize_handler (evt) { 102 | _z.handler(RESIZE, window.innerWidth, window.innerHeight); 103 | } 104 | 105 | --------------------------------------------------------------------------------