├── .gitattributes ├── .editorconfig ├── third ├── stb_image.cpp ├── stb_image_write.cpp ├── CMakeLists.txt └── stb_image_write.h ├── .gitignore ├── CMakeLists.txt ├── framepacker.vcxproj.filters ├── framepacker.sln ├── LICENSE ├── framepacker.vcxproj.user ├── README.md ├── framepacker.vcxproj ├── framepacker.cpp └── framepacker.hpp /.gitattributes: -------------------------------------------------------------------------------- 1 | third/* linguist-vendored 2 | -------------------------------------------------------------------------------- /.editorconfig: -------------------------------------------------------------------------------- 1 | root = true 2 | 3 | [*] 4 | indent_style = tab 5 | indent_size = 2 6 | -------------------------------------------------------------------------------- /third/stb_image.cpp: -------------------------------------------------------------------------------- 1 | #define STB_IMAGE_IMPLEMENTATION 1 2 | #include "stb_image.h" 3 | -------------------------------------------------------------------------------- /third/stb_image_write.cpp: -------------------------------------------------------------------------------- 1 | #define STB_IMAGE_WRITE_IMPLEMENTATION 2 | 3 | #include "stb_image_write.h" 4 | -------------------------------------------------------------------------------- /third/CMakeLists.txt: -------------------------------------------------------------------------------- 1 | cmake_minimum_required(VERSION 3.8.2) 2 | 3 | add_library (framepacker_third_party 4 | stb_image.h 5 | stb_image.cpp 6 | stb_image_write.h 7 | stb_image_write.cpp) 8 | 9 | target_include_directories(framepacker_third_party PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}") 10 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | /.vs 2 | /output 3 | /temp 4 | 5 | /third/CMakeFiles 6 | /third/Makefile 7 | /third/cmake_install.cmake 8 | /CMakeFiles 9 | /Makefile 10 | /cmake_install.cmake 11 | /CMakeCache.txt 12 | /framepacker 13 | 14 | *.VC.db 15 | *.exe 16 | *.dll 17 | *.lib 18 | *.obj 19 | *.dbg 20 | 21 | *.a 22 | *.o 23 | *.so 24 | 25 | build 26 | -------------------------------------------------------------------------------- /CMakeLists.txt: -------------------------------------------------------------------------------- 1 | cmake_minimum_required(VERSION 3.8.2) 2 | 3 | project(framepacker_prj CXX) 4 | 5 | add_subdirectory(third) 6 | 7 | add_library(framepacker_prj INTERFACE) 8 | 9 | target_include_directories(framepacker_prj INTERFACE "${PROJECT_SOURCE_DIR}") 10 | 11 | add_executable(framepacker framepacker.cpp) 12 | 13 | target_link_libraries(framepacker PRIVATE framepacker_prj framepacker_third_party) 14 | 15 | if((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang")) 16 | target_compile_options(framepacker PRIVATE -Wall -Wextra -Werror -Wfatal-errors -std=c++11) 17 | endif((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang")) 18 | -------------------------------------------------------------------------------- /framepacker.vcxproj.filters: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | third 7 | 8 | 9 | third 10 | 11 | 12 | 13 | 14 | {ad280806-94bd-4448-9069-70eafe4ee3e2} 15 | 16 | 17 | 18 | 19 | third 20 | 21 | 22 | third 23 | 24 | 25 | -------------------------------------------------------------------------------- /framepacker.sln: -------------------------------------------------------------------------------- 1 | 2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio 2012 4 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "framepacker", "framepacker.vcxproj", "{44E27B10-3638-4E00-A372-285EFAFE1D9A}" 5 | EndProject 6 | Global 7 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 8 | Debug|Win32 = Debug|Win32 9 | Release|Win32 = Release|Win32 10 | EndGlobalSection 11 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 12 | {44E27B10-3638-4E00-A372-285EFAFE1D9A}.Debug|Win32.ActiveCfg = Debug|Win32 13 | {44E27B10-3638-4E00-A372-285EFAFE1D9A}.Debug|Win32.Build.0 = Debug|Win32 14 | {44E27B10-3638-4E00-A372-285EFAFE1D9A}.Release|Win32.ActiveCfg = Release|Win32 15 | {44E27B10-3638-4E00-A372-285EFAFE1D9A}.Release|Win32.Build.0 = Release|Win32 16 | EndGlobalSection 17 | GlobalSection(SolutionProperties) = preSolution 18 | HideSolutionNode = FALSE 19 | EndGlobalSection 20 | EndGlobal 21 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License 2 | 3 | Copyright (C) 2015, 2020 Wang Renxin 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy of 6 | this software and associated documentation files (the "Software"), to deal in 7 | the Software without restriction, including without limitation the rights to 8 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of 9 | the Software, and to permit persons to whom the Software is furnished to do so, 10 | 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, FITNESS 17 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 18 | COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 21 | -------------------------------------------------------------------------------- /framepacker.vcxproj.user: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | test/pet_icon_17.png test/pet_icon_01.png test/pet_icon_02.png test/pet_icon_03.png test/pet_icon_04.png test/pet_icon_05.png test/pet_icon_06.png test/pet_icon_07.png test/pet_icon_08.png test/pet_icon_09.png test/pet_icon_10.png test/pet_icon_11.png test/pet_icon_12.png test/pet_icon_13.png test/pet_icon_14.png test/pet_icon_15.png test/pet_icon_16.png test/pet_icon_17.png test/pet_icon_18.png test/pet_icon_19.png test/pet_icon_20.png test/pet_icon_01.png test/pet_icon_01.png test/pet_icon_01.png test/pet_icon_01.png test/pet_icon_01.png -o output -w -s 128x256 -t 5 | WindowsLocalDebugger 6 | 7 | 8 | 9 | 10 | WindowsLocalDebugger 11 | 12 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # framepacker 2 | 3 | **framepacker** is a freeware which implements a texture bin packing algorithm. It's similar to texture tools like the TexturePacker. You are free to use, copy, modify or distribute it under the MIT license. 4 | 5 | It implements a bin packer algorithm refer to the [Binary Tree Bin Packing Algorithm](http://codeincomplete.com/posts/2011/5/7/bin_packing/). 6 | 7 | ## Compile 8 | 9 | A C++ 11 compiler is required to compile the source code. The `framepacker::packer` template class in `framepacker.hpp` is the algorithm implementation. And it offers a specialization in `framepacker.cpp` using stb image. 10 | 11 | ## Usage 12 | 13 | It works as a command line tool: 14 | 15 | * framepacker FILE_LIST [-o output_file] [OPTIONS] - Packs some images 16 | * FILE_LIST 17 | * := file * : Eg. file1.png file2.png 18 | * OPTIONS 19 | * := -p N : Padding, default to 1 20 | * := -s MxN : Expected texture size, eg. 256x512, may enlarge result 21 | * := -t : Disable rotation 22 | * := -w : Disable forcing texture to POT (Power of 2) 23 | * := -m : Disable alpha trim 24 | 25 | Eg. "**framepacker** foo.png bar.png -o out", it generates a packed `out.png` image and another `out.json` meta data which includes packing information to look up slices from the image. 26 | 27 | ## Performance 28 | 29 | **framepacker** is fast, it packs 200 textures in less than 0.15s on common desktop machines at 2015. 30 | -------------------------------------------------------------------------------- /framepacker.vcxproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | 14 | {44E27B10-3638-4E00-A372-285EFAFE1D9A} 15 | Win32Proj 16 | framepacker 17 | 8.1 18 | 19 | 20 | 21 | Application 22 | true 23 | v140 24 | Unicode 25 | 26 | 27 | Application 28 | false 29 | v140 30 | true 31 | Unicode 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | true 45 | $(SolutionDir)output/debug/ 46 | $(SolutionDir)temp/debug/ 47 | 48 | 49 | false 50 | $(SolutionDir)output/release/ 51 | $(SolutionDir)temp/release/ 52 | 53 | 54 | 55 | 56 | 57 | Level3 58 | Disabled 59 | WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions) 60 | true 61 | MultiThreadedDebugDLL 62 | 63 | 64 | $(ProjectDir)third;$(ProjectDir) 65 | 66 | 67 | Console 68 | true 69 | %(AdditionalDependencies) 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | Level3 87 | 88 | 89 | MaxSpeed 90 | true 91 | true 92 | WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 93 | true 94 | MultiThreadedDLL 95 | $(ProjectDir)third;$(ProjectDir) 96 | 97 | 98 | Console 99 | true 100 | true 101 | true 102 | %(AdditionalDependencies) 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127 | 128 | 129 | 130 | -------------------------------------------------------------------------------- /framepacker.cpp: -------------------------------------------------------------------------------- 1 | /* 2 | ** This source file is part of framepacker 3 | ** 4 | ** For the latest info, see https://github.com/paladin-t/framepacker/ 5 | ** 6 | ** Copyright (C) 2015, 2020 Wang Renxin 7 | ** Copyright (C) 2020 Taylor Holberton 8 | ** 9 | ** Permission is hereby granted, free of charge, to any person obtaining a copy of 10 | ** this software and associated documentation files (the "Software"), to deal in 11 | ** the Software without restriction, including without limitation the rights to 12 | ** use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of 13 | ** the Software, and to permit persons to whom the Software is furnished to do so, 14 | ** subject to the following conditions: 15 | ** 16 | ** The above copyright notice and this permission notice shall be included in all 17 | ** copies or substantial portions of the Software. 18 | ** 19 | ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 20 | ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS 21 | ** FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 22 | ** COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 23 | ** IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 24 | ** CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 | */ 26 | 27 | #include 28 | 29 | #include 30 | #include 31 | 32 | #include 33 | #include 34 | 35 | // From 'third/' directory. 36 | #include 37 | #include 38 | 39 | namespace fp = framepacker; 40 | 41 | namespace { 42 | 43 | using size_type = std::size_t; 44 | 45 | using color_type = unsigned char; 46 | 47 | struct rgba final { 48 | color_type data[4]; 49 | 50 | inline static constexpr rgba from_buffer(const color_type* rgba_ptr) noexcept { 51 | return rgba { 52 | rgba_ptr[0], 53 | rgba_ptr[1], 54 | rgba_ptr[2], 55 | rgba_ptr[3] 56 | }; 57 | } 58 | 59 | inline color_type& operator [] (size_type i) noexcept { 60 | return data[i]; 61 | } 62 | 63 | inline const color_type& operator [] (size_type i) const noexcept { 64 | return data[i]; 65 | } 66 | 67 | inline constexpr bool is_transparent() const noexcept { 68 | return data[3] == 0; 69 | } 70 | }; 71 | 72 | class image final { 73 | public: 74 | ~image() { 75 | std::free(color_buffer); 76 | color_buffer = nullptr; 77 | w = 0; 78 | h = 0; 79 | } 80 | 81 | inline const char* get_path(void) const noexcept { 82 | return path.c_str(); 83 | } 84 | 85 | size_type width(void) const noexcept { 86 | return w; 87 | } 88 | size_type height(void) const noexcept { 89 | return h; 90 | } 91 | 92 | inline constexpr const color_type* data(size_type x = 0, size_type y = 0) const noexcept { 93 | return &color_buffer[((y * w) + x) * 4]; 94 | } 95 | 96 | inline color_type* data(size_type x = 0, size_type y = 0) noexcept { 97 | return &color_buffer[((y * w) + x) * 4]; 98 | } 99 | 100 | inline constexpr rgba pixel(size_type x, size_type y) const noexcept { 101 | return rgba::from_buffer(&color_buffer[((y * w) + x) * 4]); 102 | } 103 | 104 | inline void pixel(size_type x, size_type y, const rgba &c) noexcept { 105 | auto* dst = data(x, y); 106 | dst[0] = c[0]; 107 | dst[1] = c[1]; 108 | dst[2] = c[2]; 109 | dst[3] = c[3]; 110 | } 111 | 112 | void copy_from( 113 | const image &src, 114 | size_type src_x, 115 | size_type src_y, 116 | size_type width, 117 | size_type height, 118 | size_type dst_x, 119 | size_type dst_y 120 | ) { 121 | // TODO : Worth checking if 'src' is ever equal to 'this'. 122 | // If not, then we don't need the temporary buffer. 123 | color_type* tmp = (color_type*)std::malloc(width * height * 4); 124 | if (!tmp) { 125 | return; 126 | } 127 | 128 | // Copy from source onto temporary buffer. 129 | for (size_type y = 0; y < height; y++) { 130 | const color_type* src_ptr = src.data(src_x, src_y + y); 131 | 132 | color_type* dst_ptr = &tmp[y * width * 4]; 133 | 134 | std::memcpy(dst_ptr, src_ptr, width * 4); 135 | } 136 | 137 | // Copy from temporary buffer to destination. 138 | for (size_type y = 0; y < height; y++) { 139 | const color_type* src_ptr = &tmp[y * width * 4]; 140 | 141 | color_type* dst_ptr = data(dst_x, dst_y + y); 142 | 143 | std::memcpy(dst_ptr, src_ptr, width * 4); 144 | } 145 | 146 | std::free(tmp); 147 | } 148 | 149 | inline constexpr bool is_transparent(size_type x, size_type y) const noexcept { 150 | return pixel(x, y).is_transparent(); 151 | } 152 | 153 | bool resize(size_type _w, size_type _h) noexcept { 154 | auto* tmp = (color_type*)std::realloc(color_buffer, _w * _h * 4); 155 | if (!tmp) { 156 | return false; 157 | } 158 | 159 | color_buffer = tmp; 160 | w = _w; 161 | h = _h; 162 | 163 | return true; 164 | } 165 | 166 | bool load_file(const char* p) noexcept { 167 | int tmp_w = 0; 168 | int tmp_h = 0; 169 | int tmp_n = 0; 170 | color_type* tmp = stbi_load(p, &tmp_w, &tmp_h, &tmp_n, 4); 171 | if (!tmp) { 172 | return false; 173 | } 174 | 175 | std::free(color_buffer); 176 | 177 | color_buffer = tmp; 178 | w = size_type(tmp_w); 179 | h = size_type(tmp_h); 180 | 181 | path = p; 182 | 183 | return true; 184 | } 185 | 186 | bool save_png(const char* p) noexcept { 187 | return stbi_write_png(p, w, h, 4, color_buffer, w * 4) != 0; 188 | } 189 | 190 | private: 191 | std::string path; 192 | color_type* color_buffer = nullptr; 193 | size_type w = 0; 194 | size_type h = 0; 195 | }; 196 | 197 | using packer_type = fp::packer; 198 | 199 | #define _BIN_FILE_NAME "framepacker" 200 | 201 | #define _CHECK_ARG(__c, __i, __e) \ 202 | do { \ 203 | if(__c <= __i + 1) { \ 204 | printf(__e); \ 205 | return; \ 206 | } \ 207 | } while(0) 208 | 209 | void show_tip(void) { 210 | printf("[Usage]\n"); 211 | printf(" %s FILE_LIST [-o output_file] [OPTIONS] - Packs some images\n", _BIN_FILE_NAME); 212 | printf("\n"); 213 | printf(" FILE_LIST := file * : Eg. file1.png file2.png\n"); 214 | printf(" OPTIONS := -p N : Padding, default to 1\n"); 215 | printf(" := -s MxN : Expected texture size, eg. 256x512, may enlarge result\n"); 216 | printf(" := -t : Disable rotation\n"); 217 | printf(" := -w : Disable forcing texture to POT (Power of 2)\n"); 218 | printf(" := -m : Disable alpha trim\n"); 219 | } 220 | 221 | void process_parameters(int argc, char* argv[]) { 222 | int i = 1; 223 | std::string m = "\0"; 224 | int padding = 1; 225 | int w = 0, h = 0; 226 | bool allow_rotate = true; 227 | bool power_of_2 = true; 228 | bool alpha_trim = true; 229 | 230 | std::list inputs; 231 | std::list > options; 232 | 233 | // Parse arguments. 234 | while (i < argc) { 235 | if (!std::memcmp(argv[i], "-", 1)) { 236 | if (!std::memcmp(argv[i] + 1, "o", 1)) { 237 | m = 'o'; 238 | _CHECK_ARG(argc, i, "-o: File name expected.\n"); 239 | options.push_back(std::make_pair(m, argv[++i])); 240 | ++i; 241 | } else if (!memcmp(argv[i] + 1, "p", 1)) { 242 | _CHECK_ARG(argc, i, "-p: Padding size expected.\n"); 243 | padding = std::max(std::atoi(argv[++i]), 0); 244 | } else if (!memcmp(argv[i] + 1, "s", 1)) { 245 | _CHECK_ARG(argc, i, "-s: Size expected.\n"); 246 | std::string buf = argv[++i]; 247 | size_t sep = buf.find('x'); 248 | if (sep != std::string::npos) { 249 | std::string wstr = buf.substr(0, sep); 250 | std::string hstr = buf.substr(sep + 1); 251 | w = std::atoi(wstr.c_str()); 252 | h = std::atoi(hstr.c_str()); 253 | } 254 | ++i; 255 | } else if (!memcmp(argv[i] + 1, "t", 1)) { 256 | allow_rotate = false; 257 | ++i; 258 | } else if (!memcmp(argv[i] + 1, "w", 1)) { 259 | power_of_2 = false; 260 | ++i; 261 | } else if (!memcmp(argv[i] + 1, "m", 1)) { 262 | alpha_trim = false; 263 | ++i; 264 | } else { 265 | printf("Unknown argument: %s.\n", argv[i++]); 266 | } 267 | } else { 268 | inputs.push_back(argv[i++]); 269 | } 270 | } 271 | 272 | // Tell output path. 273 | std::string outpath = "output.png"; 274 | for (auto it = options.begin(); it != options.end(); ++it) { 275 | if (it->first == "o") 276 | outpath = it->second; 277 | } 278 | 279 | packer_type packer; 280 | packer.padding = padding; 281 | packer.output_texture_size = fp::vec2(w, h); 282 | packer.allow_rotate = allow_rotate; 283 | packer.power_of_2 = power_of_2; 284 | packer.alpha_trim = alpha_trim; 285 | packer.comparer = packer_type::compare_area; 286 | 287 | for (auto it = inputs.begin(); it != inputs.end(); ++it) { 288 | image* img = new image; 289 | 290 | if (!img->load_file(it->c_str())) { 291 | // TODO : handle this 292 | } 293 | 294 | packer_type::texture_type texture(img); 295 | 296 | packer.add(it->c_str(), texture); 297 | } 298 | 299 | // Pack it. 300 | packer_type::texture_type result(new image); 301 | packer_type::texture_coll_type packed; 302 | packer_type::texture_coll_type failed; 303 | packer.pack(result, packed, failed); 304 | 305 | // Prompt. 306 | { 307 | for (auto it = packed.begin(); it != packed.end(); ++it) { 308 | packer_type::block_type &blk = it->second; 309 | printf(" %s [%d, %d] - [%d, %d]\n", it->first.c_str(), blk.fit->min_x(), blk.fit->min_y(), blk.fit->min_x() + blk.fit->width(), blk.fit->min_y() + blk.fit->height()); 310 | } 311 | } 312 | if (failed.size()) { 313 | for (auto it = failed.begin(); it != failed.end(); ++it) { 314 | printf(" %s\n", it->first.c_str()); 315 | } 316 | } 317 | 318 | // Serialize. 319 | { 320 | std::string out_tex = outpath + ".png"; 321 | result->save_png(out_tex.c_str()); 322 | printf("Texture written: %s.\n", out_tex.c_str()); 323 | } 324 | { 325 | std::string out_meta = outpath + ".json"; 326 | std::ofstream fs(out_meta); 327 | packer.write_meta(fs, packed, result, outpath.c_str()); 328 | fs.close(); 329 | printf("Meta data written: %s.\n", out_meta.c_str()); 330 | } 331 | } 332 | 333 | } // namespace 334 | 335 | int main(int argc, char* argv[]) { 336 | if (argc == 1) 337 | show_tip(); 338 | else if (argc >= 2) 339 | process_parameters(argc, argv); 340 | 341 | return 0; 342 | } 343 | -------------------------------------------------------------------------------- /framepacker.hpp: -------------------------------------------------------------------------------- 1 | /* 2 | ** This source file is part of framepacker 3 | ** 4 | ** For the latest info, see https://github.com/paladin-t/framepacker/ 5 | ** 6 | ** Copyright (C) 2015 Wang Renxin 7 | ** 8 | ** Permission is hereby granted, free of charge, to any person obtaining a copy of 9 | ** this software and associated documentation files (the "Software"), to deal in 10 | ** the Software without restriction, including without limitation the rights to 11 | ** use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of 12 | ** the Software, and to permit persons to whom the Software is furnished to do so, 13 | ** subject to the following conditions: 14 | ** 15 | ** The above copyright notice and this permission notice shall be included in all 16 | ** copies or substantial portions of the Software. 17 | ** 18 | ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 | ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS 20 | ** FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 21 | ** COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 22 | ** IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 23 | ** CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 24 | */ 25 | 26 | #ifndef FRAMEPACKER_FRAMEPACKER_HPP 27 | #define FRAMEPACKER_FRAMEPACKER_HPP 28 | 29 | #include 30 | #include 31 | #include 32 | #include 33 | #include 34 | #include 35 | #include 36 | 37 | namespace framepacker { 38 | 39 | struct match_path_separator { 40 | bool operator () (char ch) const { 41 | return ch == '\\' || ch == '/'; 42 | } 43 | }; 44 | 45 | std::string basename(const std::string &pathname) { 46 | return std::string(std::find_if(pathname.rbegin(), pathname.rend(), match_path_separator()).base(), pathname.end()); 47 | } 48 | 49 | struct vec2 { 50 | vec2() : x(0), y(0) { 51 | } 52 | vec2(int _x, int _y) : x(_x), y(_y) { 53 | } 54 | 55 | vec2 operator + (const vec2 &o) const { 56 | return vec2(x + o.x, y + o.y); 57 | } 58 | vec2 operator - (const vec2 &o) const { 59 | return vec2(x - o.x, y - o.y); 60 | } 61 | 62 | bool is_zero(void) const { 63 | return x == 0 && y == 0; 64 | } 65 | 66 | int x; 67 | int y; 68 | }; 69 | 70 | struct rect { 71 | rect() { 72 | } 73 | rect(int l, int t, int r, int b) { 74 | min = vec2(l, t); 75 | max = vec2(r, b); 76 | } 77 | 78 | int min_x(void) const { 79 | return min.x; 80 | } 81 | int min_y(void) const { 82 | return min.y; 83 | } 84 | int max_x(void) const { 85 | return max.x; 86 | } 87 | int max_y(void) const { 88 | return max.y; 89 | } 90 | 91 | void min_x(int v) { 92 | min.x = v; 93 | if (v > max.x) 94 | max.x = v; 95 | } 96 | void min_y(int v) { 97 | min.y = v; 98 | if (v > max.y) 99 | max.y = v; 100 | } 101 | void max_x(int v) { 102 | max.x = v; 103 | if (v < min.x) 104 | min.x = v; 105 | } 106 | void max_y(int v) { 107 | max.y = v; 108 | if (v < min.y) 109 | min.y = v; 110 | } 111 | 112 | int width(void) const { 113 | return max.x - min.x; 114 | } 115 | int height(void) const { 116 | return max.y - min.y; 117 | } 118 | 119 | void width(unsigned w) { 120 | max_x(min_x() + w); 121 | } 122 | void height(unsigned h) { 123 | max_y(min_y() + h); 124 | } 125 | 126 | int area(void) const { 127 | return width() * height(); 128 | } 129 | 130 | vec2 left_top(void) const { 131 | return min; 132 | } 133 | vec2 left_bottom(void) const { 134 | return vec2(min.x, max.y); 135 | } 136 | vec2 right_top(void) const { 137 | return vec2(max.x, min.y); 138 | } 139 | vec2 right_bottom(void) const { 140 | return max; 141 | } 142 | 143 | vec2 size(void) const { 144 | return vec2(max.x - min.x + 1, max.y - min.y + 1); 145 | } 146 | 147 | rect add(int p) const { 148 | return rect(min.x + p, min.y + p, max.x + p, max.y + p); 149 | } 150 | 151 | vec2 min; 152 | vec2 max; 153 | }; 154 | 155 | std::ostream &operator << (std::ostream &s, const vec2 &r) { 156 | s << "{" << r.x << "," << r.y << "}"; 157 | 158 | return s; 159 | } 160 | 161 | std::ostream &operator << (std::ostream &s, const rect &r) { 162 | s << "{" << r.min << "," << r.size() << "}"; 163 | 164 | return s; 165 | } 166 | 167 | struct node : public rect { 168 | typedef std::shared_ptr ptr_type; 169 | 170 | node() : used(false), down(nullptr), right(nullptr) { 171 | } 172 | node(int x, int y, int w, int h) : used(false), down(nullptr), right(nullptr) { 173 | min_x(x); 174 | min_y(y); 175 | width(w); 176 | height(h); 177 | } 178 | node(const node &o) : rect(o) { 179 | used = o.used; 180 | down = o.down; 181 | right = o.right; 182 | } 183 | ~node() { 184 | clear(); 185 | } 186 | 187 | void clear(void) { 188 | if (down) { 189 | down->clear(); 190 | down = nullptr; 191 | } 192 | if (right) { 193 | right->clear(); 194 | right = nullptr; 195 | } 196 | } 197 | 198 | bool used; 199 | node::ptr_type down; 200 | node::ptr_type right; 201 | }; 202 | 203 | template 204 | struct block { 205 | typedef T texture_type; 206 | 207 | block() : fit(nullptr), rotated(false) { 208 | } 209 | block(const texture_type &i, const char* p, bool alpha_trim) : fit(nullptr), rotated(false) { 210 | texture = i; 211 | calc_valid(alpha_trim); 212 | path = p; 213 | name = basename(p); 214 | } 215 | block(const block &o) { 216 | fit = o.fit; 217 | texture = o.texture; 218 | valid = o.valid; 219 | path = o.path; 220 | name = o.name; 221 | rotated = o.rotated; 222 | } 223 | ~block() { 224 | } 225 | 226 | block &operator = (const block &o) { 227 | fit = o.fit; 228 | texture = o.texture; 229 | valid = o.valid; 230 | path = o.path; 231 | name = o.name; 232 | 233 | return *this; 234 | } 235 | 236 | rect valid_area(void) const { 237 | if (!rotated) 238 | return valid; 239 | 240 | rect ret; 241 | ret.min = valid.min; 242 | ret.max = vec2(valid.max_y(), valid.max_x()); 243 | 244 | return ret; 245 | } 246 | 247 | void calc_valid(bool alpha_trim) { 248 | if (alpha_trim) { 249 | int minx = std::numeric_limits::max(); 250 | int miny = std::numeric_limits::max(); 251 | int maxx = std::numeric_limits::min(); 252 | int maxy = std::numeric_limits::min(); 253 | 254 | bool found = false; 255 | for (int j = 0; j < int(texture->height()); j++) { 256 | for (int i = 0; i < int(texture->width()); i++) { 257 | if (!texture->is_transparent(i, j)) { 258 | miny = j; 259 | found = true; 260 | 261 | break; 262 | } 263 | } 264 | if (found) 265 | break; 266 | } 267 | found = false; 268 | for (int j = texture->height() - 1; j >= 0; j--) { 269 | for (int i = 0; i < int(texture->width()); i++) { 270 | if (!texture->is_transparent(i, j)) { 271 | maxy = j; 272 | found = true; 273 | 274 | break; 275 | } 276 | } 277 | if (found) 278 | break; 279 | } 280 | found = false; 281 | for (int i = 0; i < int(texture->width()); i++) { 282 | for (int j = miny; j <= maxy; j++) { 283 | if (!texture->is_transparent(i, j)) { 284 | minx = i; 285 | found = true; 286 | 287 | break; 288 | } 289 | } 290 | if (found) 291 | break; 292 | } 293 | found = false; 294 | for (int i = texture->width() - 1; i >= 0; i--) { 295 | for (int j = miny; j <= maxy; j++) { 296 | if (!texture->is_transparent(i, j)) { 297 | maxx = i; 298 | found = true; 299 | 300 | break; 301 | } 302 | } 303 | if (found) 304 | break; 305 | } 306 | 307 | valid.min_x(minx); 308 | valid.min_y(miny); 309 | valid.max_x(maxx); 310 | valid.max_y(maxy); 311 | } else { 312 | valid.min_x(0); 313 | valid.min_y(0); 314 | valid.max_x(texture->width() - 1); 315 | valid.max_y(texture->height() - 1); 316 | } 317 | } 318 | 319 | void clear(void) { 320 | if (fit) 321 | fit->clear(); 322 | rotated = false; 323 | } 324 | 325 | void write_meta(std::ostream &s, int &indent, int padding) const { 326 | indent++; 327 | rect frame; 328 | vec2 loc = fit->min; 329 | frame.min = loc; 330 | frame.max = loc + valid.size() - vec2(1, 1); 331 | s << get_indent(indent) << "frame : " << "\"" << frame.add(padding) << "\"" << "," << std::endl; 332 | s << get_indent(indent) << "offset : " << "\"" << vec2() << "\"" << "," << std::endl; 333 | s << get_indent(indent) << "rotated : " << "false" << "," << std::endl; 334 | s << get_indent(indent) << "sourceColorRect : " << "\"" << valid << "\"" << "," << std::endl; 335 | s << get_indent(indent) << "sourceSize : " << "\"" << vec2(texture->width(), texture->height()) << "\"" << std::endl; 336 | indent--; 337 | } 338 | 339 | std::string get_indent(int indent) const { 340 | std::string ret; 341 | for (int i = 0; i < indent; i++) 342 | ret += "\t"; 343 | 344 | return ret; 345 | } 346 | 347 | node::ptr_type fit; 348 | texture_type texture; 349 | rect valid; 350 | std::string path; 351 | std::string name; 352 | bool rotated; 353 | }; 354 | 355 | template 356 | class packer { 357 | public: 358 | typedef I image_type; 359 | typedef std::shared_ptr texture_type; 360 | typedef block block_type; 361 | typedef std::string name_type; 362 | typedef std::pair texture_item_type; 363 | typedef std::list texture_coll_type; 364 | typedef bool(*texture_compare_type)(const texture_item_type &, const texture_item_type &); 365 | 366 | static bool compare_smart(const texture_item_type &l, const texture_item_type &r) { 367 | return l.second.valid.width() < r.second.valid.width(); 368 | } 369 | static bool compare_rand(const texture_item_type &, const texture_item_type &) { 370 | return std::rand() % 100 < 50; 371 | } 372 | static bool compare_width(const texture_item_type &l, const texture_item_type &r) { 373 | return l.second.valid.width() < r.second.valid.width(); 374 | } 375 | static bool compare_height(const texture_item_type &l, const texture_item_type &r) { 376 | return l.second.valid.height() < r.second.valid.height(); 377 | } 378 | static bool compare_area(const texture_item_type &l, const texture_item_type &r) { 379 | return l.second.valid.area() < r.second.valid.area(); 380 | } 381 | 382 | public: 383 | packer() : comparer(compare_smart), padding(1), allow_rotate(true), power_of_2(true), alpha_trim(true) { 384 | total_area = 0; 385 | indent = 0; 386 | } 387 | ~packer() { 388 | tidy(); 389 | } 390 | 391 | const block_type* get(const name_type &name) const { 392 | for (auto it = images.begin(); it != images.end(); ++it) { 393 | const texture_item_type &i = *it; 394 | const block_type &blk = i.second; 395 | if (i.first == name) 396 | return &blk; 397 | } 398 | 399 | return nullptr; 400 | } 401 | bool add(const name_type &name, const texture_type &img) { 402 | if (get(name)) 403 | return false; 404 | 405 | images.push_back(texture_item_type(name, block_type(img, name.c_str(), alpha_trim))); 406 | total_area += images.back().second.valid.area(); 407 | 408 | return true; 409 | } 410 | bool remove(const name_type &name) { 411 | if (!get(name)) 412 | return false; 413 | 414 | for (auto it = images.begin(); it != images.end(); ++it) { 415 | texture_item_type &i = *it; 416 | block_type &blk = i.second; 417 | if (i.first == name) { 418 | total_area -= blk.valid.area(); 419 | 420 | images.erase(it); 421 | 422 | break; 423 | } 424 | } 425 | 426 | return true; 427 | } 428 | void clear(void) { 429 | tidy(); 430 | 431 | images.clear(); 432 | 433 | total_area = 0; 434 | } 435 | 436 | void tidy(void) { 437 | for (auto it = images.begin(); it != images.end(); ++it) { 438 | texture_item_type &i = *it; 439 | block_type &blk = i.second; 440 | blk.clear(); 441 | } 442 | if (root) 443 | root->clear(); 444 | } 445 | 446 | void write_meta(std::ostream &s, const texture_coll_type &p, const texture_type &t, const char* n) { 447 | s << "{" << std::endl; 448 | { 449 | indent++; 450 | s << get_indent() << "frames : {" << std::endl; 451 | { 452 | indent++; 453 | unsigned int i = 0; 454 | for (auto it = p.begin(); it != p.end(); ++it) { 455 | const block_type &blk = it->second; 456 | s << get_indent() << blk.name << " : {" << std::endl; 457 | blk.write_meta(s, indent, padding); 458 | if (i == p.size() - 1) 459 | s << get_indent() << "}" << std::endl; 460 | else 461 | s << get_indent() << "}," << std::endl; 462 | i++; 463 | } 464 | indent--; 465 | } 466 | s << get_indent() << "}," << std::endl; 467 | indent--; 468 | } 469 | { 470 | indent++; 471 | s << get_indent() << "metadata : {" << std::endl; 472 | { 473 | indent++; 474 | s << get_indent() << "textureName : " << n << "," << std::endl; 475 | s << get_indent() << "size : " << "\"" << vec2(t->width(), t->height()) << "\"" << std::endl; 476 | indent--; 477 | } 478 | s << get_indent() << "}" << std::endl; 479 | indent--; 480 | } 481 | s << "}" << std::endl; 482 | } 483 | 484 | void pack(texture_type &result, texture_coll_type &packed, texture_coll_type &failed) { 485 | // Step 1. Tidy. 486 | tidy(); 487 | 488 | // Step 2. Sort. 489 | images.sort(comparer); 490 | 491 | // Step 3. Fit. 492 | if (output_texture_size.is_zero()) { 493 | if (sqrt_area) { 494 | int s = (int)(std::sqrt(total_area) + 0.5f); 495 | root = node::ptr_type(new node(0, 0, s, s)); 496 | } else { 497 | int w = images.size() ? (images.begin()->second.valid.width() + (padding * 2)) : 0; 498 | int h = images.size() ? (images.begin()->second.valid.height() + (padding * 2)) : 0; 499 | root = node::ptr_type(new node(0, 0, w, h)); 500 | } 501 | } else { 502 | root = node::ptr_type(new node(0, 0, output_texture_size.x, output_texture_size.y)); 503 | } 504 | node::ptr_type nd = nullptr; 505 | for (auto it = images.begin(); it != images.end(); ++it) { 506 | texture_item_type &i = *it; 507 | block_type &blk = i.second; 508 | if ((nd = find(root, blk.valid.width() + (padding * 2), blk.valid.height() + (padding * 2)))) 509 | blk.fit = split(nd, blk.valid.width() + (padding * 2), blk.valid.height() + (padding * 2)); 510 | else 511 | blk.fit = grow(blk.valid.width() + (padding * 2), blk.valid.height() + (padding * 2)); 512 | 513 | if (!blk.fit && allow_rotate) { 514 | blk.rotated = true; 515 | if ((nd = find(root, blk.valid_area().width() + (padding * 2), blk.valid_area().height() + (padding * 2)))) 516 | blk.fit = split(nd, blk.valid_area().width() + (padding * 2), blk.valid_area().height() + (padding * 2)); 517 | else 518 | blk.fit = grow(blk.valid_area().width() + (padding * 2), blk.valid_area().height() + (padding * 2)); 519 | } 520 | 521 | if (blk.fit) 522 | packed.push_back(texture_item_type(i.first, block_type(blk))); 523 | else 524 | failed.push_back(texture_item_type(i.first, block_type(blk))); 525 | } 526 | 527 | // Step 4. Draw. 528 | vec2 os(root->width(), root->height()); 529 | if (power_of_2) { 530 | os.x = (int)std::pow(2, std::ceil(std::log(os.x) / std::log(2))); 531 | os.y = (int)std::pow(2, std::ceil(std::log(os.y) / std::log(2))); 532 | } 533 | result->resize(os.x, os.y); 534 | for (auto it = packed.begin(); it != packed.end(); ++it) { 535 | texture_item_type &i = *it; 536 | block_type &blk = i.second; 537 | if (blk.rotated) { 538 | for (int j = 0; j < blk.valid.height(); j++) { 539 | for (int i = 0; i < blk.valid.width(); i++) { 540 | int x = i + blk.fit->min_x() + padding; 541 | int y = j + blk.fit->min_y() + padding; 542 | result->pixel(y, x, blk.texture->pixel(i + blk.valid.min_x(), j + blk.valid.min_y())); 543 | } 544 | } 545 | } else { 546 | if (per_pixel) { 547 | for (int j = 0; j < blk.valid.height(); j++) { 548 | for (int i = 0; i < blk.valid.width(); i++) { 549 | int x = i + blk.fit->min_x() + padding; 550 | int y = j + blk.fit->min_y() + padding; 551 | result->pixel(x, y, blk.texture->pixel(i + blk.valid.min_x(), j + blk.valid.min_y())); 552 | } 553 | } 554 | } else { 555 | result->copy_from( 556 | *blk.texture.get(), 557 | blk.valid.min_x(), blk.texture->height() - blk.valid.min_y() - blk.valid.height(), 558 | blk.valid.width(), blk.valid.height(), 559 | blk.fit->min_x() + padding, blk.fit->min_y() + padding 560 | ); 561 | } 562 | } 563 | } 564 | } 565 | 566 | private: 567 | node::ptr_type find(node::ptr_type root, int w, int h) { 568 | if (root->used) { 569 | node::ptr_type r = find(root->right, w, h); 570 | if (!r) r = find(root->down, w, h); 571 | 572 | return r; 573 | } else if (w <= root->width() && h <= root->height()) { 574 | return root; 575 | } else { 576 | return nullptr; 577 | } 578 | } 579 | 580 | node::ptr_type split(node::ptr_type nd, int w, int h) { 581 | nd->used = true; 582 | nd->down = node::ptr_type(new node(nd->min_x(), nd->min_y() + h, nd->width(), nd->height() - h)); 583 | nd->right = node::ptr_type(new node(nd->min_x() + w, nd->min_y(), nd->width() - w, h)); 584 | 585 | return nd; 586 | } 587 | 588 | node::ptr_type grow(int w, int h) { 589 | bool can_grow_down = w <= root->width(); 590 | bool can_grow_right = h <= root->height(); 591 | 592 | bool should_grow_right = can_grow_right && (root->height() >= (root->width() + w)); 593 | bool should_grow_down = can_grow_down && (root->width() >= (root->height() + h)); 594 | 595 | if (should_grow_right) 596 | return grow_right(w, h); 597 | else if (should_grow_down) 598 | return grow_down(w, h); 599 | else if (can_grow_right) 600 | return grow_right(w, h); 601 | else if (can_grow_down) 602 | return grow_down(w, h); 603 | else 604 | return nullptr; 605 | } 606 | 607 | node::ptr_type grow_right(int w, int h) { 608 | node* r = new node(0, 0, root->width() + w, root->height()); 609 | r->used = true; 610 | r->down = root; 611 | r->right = node::ptr_type(new node(root->width(), 0, w, root->height())); 612 | root = node::ptr_type(r); 613 | 614 | node::ptr_type node = nullptr; 615 | if ((node = find(root, w, h))) 616 | return split(node, w, h); 617 | else 618 | return nullptr; 619 | } 620 | node::ptr_type grow_down(int w, int h) { 621 | node* r = new node(0, 0, root->width(), root->height() + h); 622 | r->used = true; 623 | r->down = node::ptr_type(new node(0, root->height(), root->width(), h)); 624 | r->right = root; 625 | root = node::ptr_type(r); 626 | 627 | node::ptr_type node = nullptr; 628 | if ((node = find(root, w, h))) 629 | return split(node, w, h); 630 | else 631 | return nullptr; 632 | } 633 | 634 | std::string get_indent(void) const { 635 | std::string ret; 636 | for (int i = 0; i < indent; i++) 637 | ret += "\t"; 638 | 639 | return ret; 640 | } 641 | 642 | public: 643 | texture_compare_type comparer; 644 | 645 | int padding; 646 | bool allow_rotate; 647 | bool power_of_2; 648 | bool alpha_trim; 649 | vec2 output_texture_size; 650 | 651 | private: 652 | texture_coll_type images; 653 | node::ptr_type root; 654 | int total_area; 655 | 656 | int indent; 657 | }; 658 | 659 | } 660 | 661 | #endif // FRAMEPACKER_FRAMEPACKER_HPP 662 | -------------------------------------------------------------------------------- /third/stb_image_write.h: -------------------------------------------------------------------------------- 1 | /* stb_image_write - v1.14 - public domain - http://nothings.org/stb 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 | ABOUT: 14 | 15 | This header file is a library for writing images to C stdio or a callback. 16 | 17 | The PNG output is not optimal; it is 20-50% larger than the file 18 | written by a decent optimizing implementation; though providing a custom 19 | zlib compress function (see STBIW_ZLIB_COMPRESS) can mitigate that. 20 | This library is designed for source code compactness and simplicity, 21 | not optimal image file size or run-time performance. 22 | 23 | BUILDING: 24 | 25 | You can #define STBIW_ASSERT(x) before the #include to avoid using assert.h. 26 | You can #define STBIW_MALLOC(), STBIW_REALLOC(), and STBIW_FREE() to replace 27 | malloc,realloc,free. 28 | You can #define STBIW_MEMMOVE() to replace memmove() 29 | You can #define STBIW_ZLIB_COMPRESS to use a custom zlib-style compress function 30 | for PNG compression (instead of the builtin one), it must have the following signature: 31 | unsigned char * my_compress(unsigned char *data, int data_len, int *out_len, int quality); 32 | The returned data will be freed with STBIW_FREE() (free() by default), 33 | so it must be heap allocated with STBIW_MALLOC() (malloc() by default), 34 | 35 | UNICODE: 36 | 37 | If compiling for Windows and you wish to use Unicode filenames, compile 38 | with 39 | #define STBIW_WINDOWS_UTF8 40 | and pass utf8-encoded filenames. Call stbiw_convert_wchar_to_utf8 to convert 41 | Windows wchar_t filenames to utf8. 42 | 43 | USAGE: 44 | 45 | There are five functions, one for each image file format: 46 | 47 | int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); 48 | int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); 49 | int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); 50 | int stbi_write_jpg(char const *filename, int w, int h, int comp, const void *data, int quality); 51 | int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); 52 | 53 | void stbi_flip_vertically_on_write(int flag); // flag is non-zero to flip data vertically 54 | 55 | There are also five equivalent functions that use an arbitrary write function. You are 56 | expected to open/close your file-equivalent before and after calling these: 57 | 58 | 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); 59 | int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 60 | int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 61 | int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); 62 | int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); 63 | 64 | where the callback is: 65 | void stbi_write_func(void *context, void *data, int size); 66 | 67 | You can configure it with these global variables: 68 | int stbi_write_tga_with_rle; // defaults to true; set to 0 to disable RLE 69 | int stbi_write_png_compression_level; // defaults to 8; set to higher for more compression 70 | int stbi_write_force_png_filter; // defaults to -1; set to 0..5 to force a filter mode 71 | 72 | 73 | You can define STBI_WRITE_NO_STDIO to disable the file variant of these 74 | functions, so the library will not use stdio.h at all. However, this will 75 | also disable HDR writing, because it requires stdio for formatted output. 76 | 77 | Each function returns 0 on failure and non-0 on success. 78 | 79 | The functions create an image file defined by the parameters. The image 80 | is a rectangle of pixels stored from left-to-right, top-to-bottom. 81 | Each pixel contains 'comp' channels of data stored interleaved with 8-bits 82 | per channel, in the following order: 1=Y, 2=YA, 3=RGB, 4=RGBA. (Y is 83 | monochrome color.) The rectangle is 'w' pixels wide and 'h' pixels tall. 84 | The *data pointer points to the first byte of the top-left-most pixel. 85 | For PNG, "stride_in_bytes" is the distance in bytes from the first byte of 86 | a row of pixels to the first byte of the next row of pixels. 87 | 88 | PNG creates output files with the same number of components as the input. 89 | The BMP format expands Y to RGB in the file format and does not 90 | output alpha. 91 | 92 | PNG supports writing rectangles of data even when the bytes storing rows of 93 | data are not consecutive in memory (e.g. sub-rectangles of a larger image), 94 | by supplying the stride between the beginning of adjacent rows. The other 95 | formats do not. (Thus you cannot write a native-format BMP through the BMP 96 | writer, both because it is in BGR order and because it may have padding 97 | at the end of the line.) 98 | 99 | PNG allows you to set the deflate compression level by setting the global 100 | variable 'stbi_write_png_compression_level' (it defaults to 8). 101 | 102 | HDR expects linear float data. Since the format is always 32-bit rgb(e) 103 | data, alpha (if provided) is discarded, and for monochrome data it is 104 | replicated across all three channels. 105 | 106 | TGA supports RLE or non-RLE compressed data. To use non-RLE-compressed 107 | data, set the global variable 'stbi_write_tga_with_rle' to 0. 108 | 109 | JPEG does ignore alpha channels in input data; quality is between 1 and 100. 110 | Higher quality looks better but results in a bigger image. 111 | JPEG baseline (no JPEG progressive). 112 | 113 | CREDITS: 114 | 115 | 116 | Sean Barrett - PNG/BMP/TGA 117 | Baldur Karlsson - HDR 118 | Jean-Sebastien Guay - TGA monochrome 119 | Tim Kelsey - misc enhancements 120 | Alan Hickman - TGA RLE 121 | Emmanuel Julien - initial file IO callback implementation 122 | Jon Olick - original jo_jpeg.cpp code 123 | Daniel Gibson - integrate JPEG, allow external zlib 124 | Aarni Koskela - allow choosing PNG filter 125 | 126 | bugfixes: 127 | github:Chribba 128 | Guillaume Chereau 129 | github:jry2 130 | github:romigrou 131 | Sergio Gonzalez 132 | Jonas Karlsson 133 | Filip Wasil 134 | Thatcher Ulrich 135 | github:poppolopoppo 136 | Patrick Boettcher 137 | github:xeekworx 138 | Cap Petschulat 139 | Simon Rodriguez 140 | Ivan Tikhonov 141 | github:ignotion 142 | Adam Schackart 143 | 144 | LICENSE 145 | 146 | See end of file for license information. 147 | 148 | */ 149 | 150 | #ifndef INCLUDE_STB_IMAGE_WRITE_H 151 | #define INCLUDE_STB_IMAGE_WRITE_H 152 | 153 | #include 154 | 155 | // if STB_IMAGE_WRITE_STATIC causes problems, try defining STBIWDEF to 'inline' or 'static inline' 156 | #ifndef STBIWDEF 157 | #ifdef STB_IMAGE_WRITE_STATIC 158 | #define STBIWDEF static 159 | #else 160 | #ifdef __cplusplus 161 | #define STBIWDEF extern "C" 162 | #else 163 | #define STBIWDEF extern 164 | #endif 165 | #endif 166 | #endif 167 | 168 | #ifndef STB_IMAGE_WRITE_STATIC // C++ forbids static forward declarations 169 | extern int stbi_write_tga_with_rle; 170 | extern int stbi_write_png_compression_level; 171 | extern int stbi_write_force_png_filter; 172 | #endif 173 | 174 | #ifndef STBI_WRITE_NO_STDIO 175 | STBIWDEF int stbi_write_png(char const *filename, int w, int h, int comp, const void *data, int stride_in_bytes); 176 | STBIWDEF int stbi_write_bmp(char const *filename, int w, int h, int comp, const void *data); 177 | STBIWDEF int stbi_write_tga(char const *filename, int w, int h, int comp, const void *data); 178 | STBIWDEF int stbi_write_hdr(char const *filename, int w, int h, int comp, const float *data); 179 | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality); 180 | 181 | #ifdef STBI_WINDOWS_UTF8 182 | STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input); 183 | #endif 184 | #endif 185 | 186 | typedef void stbi_write_func(void *context, void *data, int size); 187 | 188 | 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); 189 | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 190 | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const void *data); 191 | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int w, int h, int comp, const float *data); 192 | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality); 193 | 194 | STBIWDEF void stbi_flip_vertically_on_write(int flip_boolean); 195 | 196 | #endif//INCLUDE_STB_IMAGE_WRITE_H 197 | 198 | #ifdef STB_IMAGE_WRITE_IMPLEMENTATION 199 | 200 | #ifdef _WIN32 201 | #ifndef _CRT_SECURE_NO_WARNINGS 202 | #define _CRT_SECURE_NO_WARNINGS 203 | #endif 204 | #ifndef _CRT_NONSTDC_NO_DEPRECATE 205 | #define _CRT_NONSTDC_NO_DEPRECATE 206 | #endif 207 | #endif 208 | 209 | #ifndef STBI_WRITE_NO_STDIO 210 | #include 211 | #endif // STBI_WRITE_NO_STDIO 212 | 213 | #include 214 | #include 215 | #include 216 | #include 217 | 218 | #if defined(STBIW_MALLOC) && defined(STBIW_FREE) && (defined(STBIW_REALLOC) || defined(STBIW_REALLOC_SIZED)) 219 | // ok 220 | #elif !defined(STBIW_MALLOC) && !defined(STBIW_FREE) && !defined(STBIW_REALLOC) && !defined(STBIW_REALLOC_SIZED) 221 | // ok 222 | #else 223 | #error "Must define all or none of STBIW_MALLOC, STBIW_FREE, and STBIW_REALLOC (or STBIW_REALLOC_SIZED)." 224 | #endif 225 | 226 | #ifndef STBIW_MALLOC 227 | #define STBIW_MALLOC(sz) malloc(sz) 228 | #define STBIW_REALLOC(p,newsz) realloc(p,newsz) 229 | #define STBIW_FREE(p) free(p) 230 | #endif 231 | 232 | #ifndef STBIW_REALLOC_SIZED 233 | #define STBIW_REALLOC_SIZED(p,oldsz,newsz) STBIW_REALLOC(p,newsz) 234 | #endif 235 | 236 | 237 | #ifndef STBIW_MEMMOVE 238 | #define STBIW_MEMMOVE(a,b,sz) memmove(a,b,sz) 239 | #endif 240 | 241 | 242 | #ifndef STBIW_ASSERT 243 | #include 244 | #define STBIW_ASSERT(x) assert(x) 245 | #endif 246 | 247 | #define STBIW_UCHAR(x) (unsigned char) ((x) & 0xff) 248 | 249 | #ifdef STB_IMAGE_WRITE_STATIC 250 | static int stbi_write_png_compression_level = 8; 251 | static int stbi_write_tga_with_rle = 1; 252 | static int stbi_write_force_png_filter = -1; 253 | #else 254 | int stbi_write_png_compression_level = 8; 255 | int stbi_write_tga_with_rle = 1; 256 | int stbi_write_force_png_filter = -1; 257 | #endif 258 | 259 | static int stbi__flip_vertically_on_write = 0; 260 | 261 | STBIWDEF void stbi_flip_vertically_on_write(int flag) 262 | { 263 | stbi__flip_vertically_on_write = flag; 264 | } 265 | 266 | typedef struct 267 | { 268 | stbi_write_func *func; 269 | void *context; 270 | } stbi__write_context; 271 | 272 | // initialize a callback-based context 273 | static void stbi__start_write_callbacks(stbi__write_context *s, stbi_write_func *c, void *context) 274 | { 275 | s->func = c; 276 | s->context = context; 277 | } 278 | 279 | #ifndef STBI_WRITE_NO_STDIO 280 | 281 | static void stbi__stdio_write(void *context, void *data, int size) 282 | { 283 | fwrite(data,1,size,(FILE*) context); 284 | } 285 | 286 | #if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) 287 | #ifdef __cplusplus 288 | #define STBIW_EXTERN extern "C" 289 | #else 290 | #define STBIW_EXTERN extern 291 | #endif 292 | STBIW_EXTERN __declspec(dllimport) int __stdcall MultiByteToWideChar(unsigned int cp, unsigned long flags, const char *str, int cbmb, wchar_t *widestr, int cchwide); 293 | 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); 294 | 295 | STBIWDEF int stbiw_convert_wchar_to_utf8(char *buffer, size_t bufferlen, const wchar_t* input) 296 | { 297 | return WideCharToMultiByte(65001 /* UTF8 */, 0, input, -1, buffer, (int) bufferlen, NULL, NULL); 298 | } 299 | #endif 300 | 301 | static FILE *stbiw__fopen(char const *filename, char const *mode) 302 | { 303 | FILE *f; 304 | #if defined(_MSC_VER) && defined(STBI_WINDOWS_UTF8) 305 | wchar_t wMode[64]; 306 | wchar_t wFilename[1024]; 307 | if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, filename, -1, wFilename, sizeof(wFilename))) 308 | return 0; 309 | 310 | if (0 == MultiByteToWideChar(65001 /* UTF8 */, 0, mode, -1, wMode, sizeof(wMode))) 311 | return 0; 312 | 313 | #if _MSC_VER >= 1400 314 | if (0 != _wfopen_s(&f, wFilename, wMode)) 315 | f = 0; 316 | #else 317 | f = _wfopen(wFilename, wMode); 318 | #endif 319 | 320 | #elif defined(_MSC_VER) && _MSC_VER >= 1400 321 | if (0 != fopen_s(&f, filename, mode)) 322 | f=0; 323 | #else 324 | f = fopen(filename, mode); 325 | #endif 326 | return f; 327 | } 328 | 329 | static int stbi__start_write_file(stbi__write_context *s, const char *filename) 330 | { 331 | FILE *f = stbiw__fopen(filename, "wb"); 332 | stbi__start_write_callbacks(s, stbi__stdio_write, (void *) f); 333 | return f != NULL; 334 | } 335 | 336 | static void stbi__end_write_file(stbi__write_context *s) 337 | { 338 | fclose((FILE *)s->context); 339 | } 340 | 341 | #endif // !STBI_WRITE_NO_STDIO 342 | 343 | typedef unsigned int stbiw_uint32; 344 | typedef int stb_image_write_test[sizeof(stbiw_uint32)==4 ? 1 : -1]; 345 | 346 | static void stbiw__writefv(stbi__write_context *s, const char *fmt, va_list v) 347 | { 348 | while (*fmt) { 349 | switch (*fmt++) { 350 | case ' ': break; 351 | case '1': { unsigned char x = STBIW_UCHAR(va_arg(v, int)); 352 | s->func(s->context,&x,1); 353 | break; } 354 | case '2': { int x = va_arg(v,int); 355 | unsigned char b[2]; 356 | b[0] = STBIW_UCHAR(x); 357 | b[1] = STBIW_UCHAR(x>>8); 358 | s->func(s->context,b,2); 359 | break; } 360 | case '4': { stbiw_uint32 x = va_arg(v,int); 361 | unsigned char b[4]; 362 | b[0]=STBIW_UCHAR(x); 363 | b[1]=STBIW_UCHAR(x>>8); 364 | b[2]=STBIW_UCHAR(x>>16); 365 | b[3]=STBIW_UCHAR(x>>24); 366 | s->func(s->context,b,4); 367 | break; } 368 | default: 369 | STBIW_ASSERT(0); 370 | return; 371 | } 372 | } 373 | } 374 | 375 | static void stbiw__writef(stbi__write_context *s, const char *fmt, ...) 376 | { 377 | va_list v; 378 | va_start(v, fmt); 379 | stbiw__writefv(s, fmt, v); 380 | va_end(v); 381 | } 382 | 383 | static void stbiw__putc(stbi__write_context *s, unsigned char c) 384 | { 385 | s->func(s->context, &c, 1); 386 | } 387 | 388 | static void stbiw__write3(stbi__write_context *s, unsigned char a, unsigned char b, unsigned char c) 389 | { 390 | unsigned char arr[3]; 391 | arr[0] = a; arr[1] = b; arr[2] = c; 392 | s->func(s->context, arr, 3); 393 | } 394 | 395 | static void stbiw__write_pixel(stbi__write_context *s, int rgb_dir, int comp, int write_alpha, int expand_mono, unsigned char *d) 396 | { 397 | unsigned char bg[3] = { 255, 0, 255}, px[3]; 398 | int k; 399 | 400 | if (write_alpha < 0) 401 | s->func(s->context, &d[comp - 1], 1); 402 | 403 | switch (comp) { 404 | case 2: // 2 pixels = mono + alpha, alpha is written separately, so same as 1-channel case 405 | case 1: 406 | if (expand_mono) 407 | stbiw__write3(s, d[0], d[0], d[0]); // monochrome bmp 408 | else 409 | s->func(s->context, d, 1); // monochrome TGA 410 | break; 411 | case 4: 412 | if (!write_alpha) { 413 | // composite against pink background 414 | for (k = 0; k < 3; ++k) 415 | px[k] = bg[k] + ((d[k] - bg[k]) * d[3]) / 255; 416 | stbiw__write3(s, px[1 - rgb_dir], px[1], px[1 + rgb_dir]); 417 | break; 418 | } 419 | /* FALLTHROUGH */ 420 | case 3: 421 | stbiw__write3(s, d[1 - rgb_dir], d[1], d[1 + rgb_dir]); 422 | break; 423 | } 424 | if (write_alpha > 0) 425 | s->func(s->context, &d[comp - 1], 1); 426 | } 427 | 428 | 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) 429 | { 430 | stbiw_uint32 zero = 0; 431 | int i,j, j_end; 432 | 433 | if (y <= 0) 434 | return; 435 | 436 | if (stbi__flip_vertically_on_write) 437 | vdir *= -1; 438 | 439 | if (vdir < 0) { 440 | j_end = -1; j = y-1; 441 | } else { 442 | j_end = y; j = 0; 443 | } 444 | 445 | for (; j != j_end; j += vdir) { 446 | for (i=0; i < x; ++i) { 447 | unsigned char *d = (unsigned char *) data + (j*x+i)*comp; 448 | stbiw__write_pixel(s, rgb_dir, comp, write_alpha, expand_mono, d); 449 | } 450 | s->func(s->context, &zero, scanline_pad); 451 | } 452 | } 453 | 454 | 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, ...) 455 | { 456 | if (y < 0 || x < 0) { 457 | return 0; 458 | } else { 459 | va_list v; 460 | va_start(v, fmt); 461 | stbiw__writefv(s, fmt, v); 462 | va_end(v); 463 | stbiw__write_pixels(s,rgb_dir,vdir,x,y,comp,data,alpha,pad, expand_mono); 464 | return 1; 465 | } 466 | } 467 | 468 | static int stbi_write_bmp_core(stbi__write_context *s, int x, int y, int comp, const void *data) 469 | { 470 | int pad = (-x*3) & 3; 471 | return stbiw__outfile(s,-1,-1,x,y,comp,1,(void *) data,0,pad, 472 | "11 4 22 4" "4 44 22 444444", 473 | 'B', 'M', 14+40+(x*3+pad)*y, 0,0, 14+40, // file header 474 | 40, x,y, 1,24, 0,0,0,0,0,0); // bitmap header 475 | } 476 | 477 | STBIWDEF int stbi_write_bmp_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) 478 | { 479 | stbi__write_context s; 480 | stbi__start_write_callbacks(&s, func, context); 481 | return stbi_write_bmp_core(&s, x, y, comp, data); 482 | } 483 | 484 | #ifndef STBI_WRITE_NO_STDIO 485 | STBIWDEF int stbi_write_bmp(char const *filename, int x, int y, int comp, const void *data) 486 | { 487 | stbi__write_context s; 488 | if (stbi__start_write_file(&s,filename)) { 489 | int r = stbi_write_bmp_core(&s, x, y, comp, data); 490 | stbi__end_write_file(&s); 491 | return r; 492 | } else 493 | return 0; 494 | } 495 | #endif //!STBI_WRITE_NO_STDIO 496 | 497 | static int stbi_write_tga_core(stbi__write_context *s, int x, int y, int comp, void *data) 498 | { 499 | int has_alpha = (comp == 2 || comp == 4); 500 | int colorbytes = has_alpha ? comp-1 : comp; 501 | int format = colorbytes < 2 ? 3 : 2; // 3 color channels (RGB/RGBA) = 2, 1 color channel (Y/YA) = 3 502 | 503 | if (y < 0 || x < 0) 504 | return 0; 505 | 506 | if (!stbi_write_tga_with_rle) { 507 | return stbiw__outfile(s, -1, -1, x, y, comp, 0, (void *) data, has_alpha, 0, 508 | "111 221 2222 11", 0, 0, format, 0, 0, 0, 0, 0, x, y, (colorbytes + has_alpha) * 8, has_alpha * 8); 509 | } else { 510 | int i,j,k; 511 | int jend, jdir; 512 | 513 | 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); 514 | 515 | if (stbi__flip_vertically_on_write) { 516 | j = 0; 517 | jend = y; 518 | jdir = 1; 519 | } else { 520 | j = y-1; 521 | jend = -1; 522 | jdir = -1; 523 | } 524 | for (; j != jend; j += jdir) { 525 | unsigned char *row = (unsigned char *) data + j * x * comp; 526 | int len; 527 | 528 | for (i = 0; i < x; i += len) { 529 | unsigned char *begin = row + i * comp; 530 | int diff = 1; 531 | len = 1; 532 | 533 | if (i < x - 1) { 534 | ++len; 535 | diff = memcmp(begin, row + (i + 1) * comp, comp); 536 | if (diff) { 537 | const unsigned char *prev = begin; 538 | for (k = i + 2; k < x && len < 128; ++k) { 539 | if (memcmp(prev, row + k * comp, comp)) { 540 | prev += comp; 541 | ++len; 542 | } else { 543 | --len; 544 | break; 545 | } 546 | } 547 | } else { 548 | for (k = i + 2; k < x && len < 128; ++k) { 549 | if (!memcmp(begin, row + k * comp, comp)) { 550 | ++len; 551 | } else { 552 | break; 553 | } 554 | } 555 | } 556 | } 557 | 558 | if (diff) { 559 | unsigned char header = STBIW_UCHAR(len - 1); 560 | s->func(s->context, &header, 1); 561 | for (k = 0; k < len; ++k) { 562 | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin + k * comp); 563 | } 564 | } else { 565 | unsigned char header = STBIW_UCHAR(len - 129); 566 | s->func(s->context, &header, 1); 567 | stbiw__write_pixel(s, -1, comp, has_alpha, 0, begin); 568 | } 569 | } 570 | } 571 | } 572 | return 1; 573 | } 574 | 575 | STBIWDEF int stbi_write_tga_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data) 576 | { 577 | stbi__write_context s; 578 | stbi__start_write_callbacks(&s, func, context); 579 | return stbi_write_tga_core(&s, x, y, comp, (void *) data); 580 | } 581 | 582 | #ifndef STBI_WRITE_NO_STDIO 583 | STBIWDEF int stbi_write_tga(char const *filename, int x, int y, int comp, const void *data) 584 | { 585 | stbi__write_context s; 586 | if (stbi__start_write_file(&s,filename)) { 587 | int r = stbi_write_tga_core(&s, x, y, comp, (void *) data); 588 | stbi__end_write_file(&s); 589 | return r; 590 | } else 591 | return 0; 592 | } 593 | #endif 594 | 595 | // ************************************************************************************************* 596 | // Radiance RGBE HDR writer 597 | // by Baldur Karlsson 598 | 599 | #define stbiw__max(a, b) ((a) > (b) ? (a) : (b)) 600 | 601 | static void stbiw__linear_to_rgbe(unsigned char *rgbe, float *linear) 602 | { 603 | int exponent; 604 | float maxcomp = stbiw__max(linear[0], stbiw__max(linear[1], linear[2])); 605 | 606 | if (maxcomp < 1e-32f) { 607 | rgbe[0] = rgbe[1] = rgbe[2] = rgbe[3] = 0; 608 | } else { 609 | float normalize = (float) frexp(maxcomp, &exponent) * 256.0f/maxcomp; 610 | 611 | rgbe[0] = (unsigned char)(linear[0] * normalize); 612 | rgbe[1] = (unsigned char)(linear[1] * normalize); 613 | rgbe[2] = (unsigned char)(linear[2] * normalize); 614 | rgbe[3] = (unsigned char)(exponent + 128); 615 | } 616 | } 617 | 618 | static void stbiw__write_run_data(stbi__write_context *s, int length, unsigned char databyte) 619 | { 620 | unsigned char lengthbyte = STBIW_UCHAR(length+128); 621 | STBIW_ASSERT(length+128 <= 255); 622 | s->func(s->context, &lengthbyte, 1); 623 | s->func(s->context, &databyte, 1); 624 | } 625 | 626 | static void stbiw__write_dump_data(stbi__write_context *s, int length, unsigned char *data) 627 | { 628 | unsigned char lengthbyte = STBIW_UCHAR(length); 629 | STBIW_ASSERT(length <= 128); // inconsistent with spec but consistent with official code 630 | s->func(s->context, &lengthbyte, 1); 631 | s->func(s->context, data, length); 632 | } 633 | 634 | static void stbiw__write_hdr_scanline(stbi__write_context *s, int width, int ncomp, unsigned char *scratch, float *scanline) 635 | { 636 | unsigned char scanlineheader[4] = { 2, 2, 0, 0 }; 637 | unsigned char rgbe[4]; 638 | float linear[3]; 639 | int x; 640 | 641 | scanlineheader[2] = (width&0xff00)>>8; 642 | scanlineheader[3] = (width&0x00ff); 643 | 644 | /* skip RLE for images too small or large */ 645 | if (width < 8 || width >= 32768) { 646 | for (x=0; x < width; x++) { 647 | switch (ncomp) { 648 | case 4: /* fallthrough */ 649 | case 3: linear[2] = scanline[x*ncomp + 2]; 650 | linear[1] = scanline[x*ncomp + 1]; 651 | linear[0] = scanline[x*ncomp + 0]; 652 | break; 653 | default: 654 | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; 655 | break; 656 | } 657 | stbiw__linear_to_rgbe(rgbe, linear); 658 | s->func(s->context, rgbe, 4); 659 | } 660 | } else { 661 | int c,r; 662 | /* encode into scratch buffer */ 663 | for (x=0; x < width; x++) { 664 | switch(ncomp) { 665 | case 4: /* fallthrough */ 666 | case 3: linear[2] = scanline[x*ncomp + 2]; 667 | linear[1] = scanline[x*ncomp + 1]; 668 | linear[0] = scanline[x*ncomp + 0]; 669 | break; 670 | default: 671 | linear[0] = linear[1] = linear[2] = scanline[x*ncomp + 0]; 672 | break; 673 | } 674 | stbiw__linear_to_rgbe(rgbe, linear); 675 | scratch[x + width*0] = rgbe[0]; 676 | scratch[x + width*1] = rgbe[1]; 677 | scratch[x + width*2] = rgbe[2]; 678 | scratch[x + width*3] = rgbe[3]; 679 | } 680 | 681 | s->func(s->context, scanlineheader, 4); 682 | 683 | /* RLE each component separately */ 684 | for (c=0; c < 4; c++) { 685 | unsigned char *comp = &scratch[width*c]; 686 | 687 | x = 0; 688 | while (x < width) { 689 | // find first run 690 | r = x; 691 | while (r+2 < width) { 692 | if (comp[r] == comp[r+1] && comp[r] == comp[r+2]) 693 | break; 694 | ++r; 695 | } 696 | if (r+2 >= width) 697 | r = width; 698 | // dump up to first run 699 | while (x < r) { 700 | int len = r-x; 701 | if (len > 128) len = 128; 702 | stbiw__write_dump_data(s, len, &comp[x]); 703 | x += len; 704 | } 705 | // if there's a run, output it 706 | if (r+2 < width) { // same test as what we break out of in search loop, so only true if we break'd 707 | // find next byte after run 708 | while (r < width && comp[r] == comp[x]) 709 | ++r; 710 | // output run up to r 711 | while (x < r) { 712 | int len = r-x; 713 | if (len > 127) len = 127; 714 | stbiw__write_run_data(s, len, comp[x]); 715 | x += len; 716 | } 717 | } 718 | } 719 | } 720 | } 721 | } 722 | 723 | static int stbi_write_hdr_core(stbi__write_context *s, int x, int y, int comp, float *data) 724 | { 725 | if (y <= 0 || x <= 0 || data == NULL) 726 | return 0; 727 | else { 728 | // Each component is stored separately. Allocate scratch space for full output scanline. 729 | unsigned char *scratch = (unsigned char *) STBIW_MALLOC(x*4); 730 | int i, len; 731 | char buffer[128]; 732 | char header[] = "#?RADIANCE\n# Written by stb_image_write.h\nFORMAT=32-bit_rle_rgbe\n"; 733 | s->func(s->context, header, sizeof(header)-1); 734 | 735 | #ifdef __STDC_WANT_SECURE_LIB__ 736 | len = sprintf_s(buffer, sizeof(buffer), "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); 737 | #else 738 | len = sprintf(buffer, "EXPOSURE= 1.0000000000000\n\n-Y %d +X %d\n", y, x); 739 | #endif 740 | s->func(s->context, buffer, len); 741 | 742 | for(i=0; i < y; i++) 743 | stbiw__write_hdr_scanline(s, x, comp, scratch, data + comp*x*(stbi__flip_vertically_on_write ? y-1-i : i)); 744 | STBIW_FREE(scratch); 745 | return 1; 746 | } 747 | } 748 | 749 | STBIWDEF int stbi_write_hdr_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const float *data) 750 | { 751 | stbi__write_context s; 752 | stbi__start_write_callbacks(&s, func, context); 753 | return stbi_write_hdr_core(&s, x, y, comp, (float *) data); 754 | } 755 | 756 | #ifndef STBI_WRITE_NO_STDIO 757 | STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const float *data) 758 | { 759 | stbi__write_context s; 760 | if (stbi__start_write_file(&s,filename)) { 761 | int r = stbi_write_hdr_core(&s, x, y, comp, (float *) data); 762 | stbi__end_write_file(&s); 763 | return r; 764 | } else 765 | return 0; 766 | } 767 | #endif // STBI_WRITE_NO_STDIO 768 | 769 | 770 | ////////////////////////////////////////////////////////////////////////////// 771 | // 772 | // PNG writer 773 | // 774 | 775 | #ifndef STBIW_ZLIB_COMPRESS 776 | // stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size() 777 | #define stbiw__sbraw(a) ((int *) (void *) (a) - 2) 778 | #define stbiw__sbm(a) stbiw__sbraw(a)[0] 779 | #define stbiw__sbn(a) stbiw__sbraw(a)[1] 780 | 781 | #define stbiw__sbneedgrow(a,n) ((a)==0 || stbiw__sbn(a)+n >= stbiw__sbm(a)) 782 | #define stbiw__sbmaybegrow(a,n) (stbiw__sbneedgrow(a,(n)) ? stbiw__sbgrow(a,n) : 0) 783 | #define stbiw__sbgrow(a,n) stbiw__sbgrowf((void **) &(a), (n), sizeof(*(a))) 784 | 785 | #define stbiw__sbpush(a, v) (stbiw__sbmaybegrow(a,1), (a)[stbiw__sbn(a)++] = (v)) 786 | #define stbiw__sbcount(a) ((a) ? stbiw__sbn(a) : 0) 787 | #define stbiw__sbfree(a) ((a) ? STBIW_FREE(stbiw__sbraw(a)),0 : 0) 788 | 789 | static void *stbiw__sbgrowf(void **arr, int increment, int itemsize) 790 | { 791 | int m = *arr ? 2*stbiw__sbm(*arr)+increment : increment+1; 792 | void *p = STBIW_REALLOC_SIZED(*arr ? stbiw__sbraw(*arr) : 0, *arr ? (stbiw__sbm(*arr)*itemsize + sizeof(int)*2) : 0, itemsize * m + sizeof(int)*2); 793 | STBIW_ASSERT(p); 794 | if (p) { 795 | if (!*arr) ((int *) p)[1] = 0; 796 | *arr = (void *) ((int *) p + 2); 797 | stbiw__sbm(*arr) = m; 798 | } 799 | return *arr; 800 | } 801 | 802 | static unsigned char *stbiw__zlib_flushf(unsigned char *data, unsigned int *bitbuffer, int *bitcount) 803 | { 804 | while (*bitcount >= 8) { 805 | stbiw__sbpush(data, STBIW_UCHAR(*bitbuffer)); 806 | *bitbuffer >>= 8; 807 | *bitcount -= 8; 808 | } 809 | return data; 810 | } 811 | 812 | static int stbiw__zlib_bitrev(int code, int codebits) 813 | { 814 | int res=0; 815 | while (codebits--) { 816 | res = (res << 1) | (code & 1); 817 | code >>= 1; 818 | } 819 | return res; 820 | } 821 | 822 | static unsigned int stbiw__zlib_countm(unsigned char *a, unsigned char *b, int limit) 823 | { 824 | int i; 825 | for (i=0; i < limit && i < 258; ++i) 826 | if (a[i] != b[i]) break; 827 | return i; 828 | } 829 | 830 | static unsigned int stbiw__zhash(unsigned char *data) 831 | { 832 | stbiw_uint32 hash = data[0] + (data[1] << 8) + (data[2] << 16); 833 | hash ^= hash << 3; 834 | hash += hash >> 5; 835 | hash ^= hash << 4; 836 | hash += hash >> 17; 837 | hash ^= hash << 25; 838 | hash += hash >> 6; 839 | return hash; 840 | } 841 | 842 | #define stbiw__zlib_flush() (out = stbiw__zlib_flushf(out, &bitbuf, &bitcount)) 843 | #define stbiw__zlib_add(code,codebits) \ 844 | (bitbuf |= (code) << bitcount, bitcount += (codebits), stbiw__zlib_flush()) 845 | #define stbiw__zlib_huffa(b,c) stbiw__zlib_add(stbiw__zlib_bitrev(b,c),c) 846 | // default huffman tables 847 | #define stbiw__zlib_huff1(n) stbiw__zlib_huffa(0x30 + (n), 8) 848 | #define stbiw__zlib_huff2(n) stbiw__zlib_huffa(0x190 + (n)-144, 9) 849 | #define stbiw__zlib_huff3(n) stbiw__zlib_huffa(0 + (n)-256,7) 850 | #define stbiw__zlib_huff4(n) stbiw__zlib_huffa(0xc0 + (n)-280,8) 851 | #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)) 852 | #define stbiw__zlib_huffb(n) ((n) <= 143 ? stbiw__zlib_huff1(n) : stbiw__zlib_huff2(n)) 853 | 854 | #define stbiw__ZHASH 16384 855 | 856 | #endif // STBIW_ZLIB_COMPRESS 857 | 858 | STBIWDEF unsigned char * stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality) 859 | { 860 | #ifdef STBIW_ZLIB_COMPRESS 861 | // user provided a zlib compress implementation, use that 862 | return STBIW_ZLIB_COMPRESS(data, data_len, out_len, quality); 863 | #else // use builtin 864 | 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 }; 865 | 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 }; 866 | 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 }; 867 | 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 }; 868 | unsigned int bitbuf=0; 869 | int i,j, bitcount=0; 870 | unsigned char *out = NULL; 871 | unsigned char ***hash_table = (unsigned char***) STBIW_MALLOC(stbiw__ZHASH * sizeof(unsigned char**)); 872 | if (hash_table == NULL) 873 | return NULL; 874 | if (quality < 5) quality = 5; 875 | 876 | stbiw__sbpush(out, 0x78); // DEFLATE 32K window 877 | stbiw__sbpush(out, 0x5e); // FLEVEL = 1 878 | stbiw__zlib_add(1,1); // BFINAL = 1 879 | stbiw__zlib_add(1,2); // BTYPE = 1 -- fixed huffman 880 | 881 | for (i=0; i < stbiw__ZHASH; ++i) 882 | hash_table[i] = NULL; 883 | 884 | i=0; 885 | while (i < data_len-3) { 886 | // hash next 3 bytes of data to be compressed 887 | int h = stbiw__zhash(data+i)&(stbiw__ZHASH-1), best=3; 888 | unsigned char *bestloc = 0; 889 | unsigned char **hlist = hash_table[h]; 890 | int n = stbiw__sbcount(hlist); 891 | for (j=0; j < n; ++j) { 892 | if (hlist[j]-data > i-32768) { // if entry lies within window 893 | int d = stbiw__zlib_countm(hlist[j], data+i, data_len-i); 894 | if (d >= best) { best=d; bestloc=hlist[j]; } 895 | } 896 | } 897 | // when hash table entry is too long, delete half the entries 898 | if (hash_table[h] && stbiw__sbn(hash_table[h]) == 2*quality) { 899 | STBIW_MEMMOVE(hash_table[h], hash_table[h]+quality, sizeof(hash_table[h][0])*quality); 900 | stbiw__sbn(hash_table[h]) = quality; 901 | } 902 | stbiw__sbpush(hash_table[h],data+i); 903 | 904 | if (bestloc) { 905 | // "lazy matching" - check match at *next* byte, and if it's better, do cur byte as literal 906 | h = stbiw__zhash(data+i+1)&(stbiw__ZHASH-1); 907 | hlist = hash_table[h]; 908 | n = stbiw__sbcount(hlist); 909 | for (j=0; j < n; ++j) { 910 | if (hlist[j]-data > i-32767) { 911 | int e = stbiw__zlib_countm(hlist[j], data+i+1, data_len-i-1); 912 | if (e > best) { // if next match is better, bail on current match 913 | bestloc = NULL; 914 | break; 915 | } 916 | } 917 | } 918 | } 919 | 920 | if (bestloc) { 921 | int d = (int) (data+i - bestloc); // distance back 922 | STBIW_ASSERT(d <= 32767 && best <= 258); 923 | for (j=0; best > lengthc[j+1]-1; ++j); 924 | stbiw__zlib_huff(j+257); 925 | if (lengtheb[j]) stbiw__zlib_add(best - lengthc[j], lengtheb[j]); 926 | for (j=0; d > distc[j+1]-1; ++j); 927 | stbiw__zlib_add(stbiw__zlib_bitrev(j,5),5); 928 | if (disteb[j]) stbiw__zlib_add(d - distc[j], disteb[j]); 929 | i += best; 930 | } else { 931 | stbiw__zlib_huffb(data[i]); 932 | ++i; 933 | } 934 | } 935 | // write out final bytes 936 | for (;i < data_len; ++i) 937 | stbiw__zlib_huffb(data[i]); 938 | stbiw__zlib_huff(256); // end of block 939 | // pad with 0 bits to byte boundary 940 | while (bitcount) 941 | stbiw__zlib_add(0,1); 942 | 943 | for (i=0; i < stbiw__ZHASH; ++i) 944 | (void) stbiw__sbfree(hash_table[i]); 945 | STBIW_FREE(hash_table); 946 | 947 | { 948 | // compute adler32 on input 949 | unsigned int s1=1, s2=0; 950 | int blocklen = (int) (data_len % 5552); 951 | j=0; 952 | while (j < data_len) { 953 | for (i=0; i < blocklen; ++i) { s1 += data[j+i]; s2 += s1; } 954 | s1 %= 65521; s2 %= 65521; 955 | j += blocklen; 956 | blocklen = 5552; 957 | } 958 | stbiw__sbpush(out, STBIW_UCHAR(s2 >> 8)); 959 | stbiw__sbpush(out, STBIW_UCHAR(s2)); 960 | stbiw__sbpush(out, STBIW_UCHAR(s1 >> 8)); 961 | stbiw__sbpush(out, STBIW_UCHAR(s1)); 962 | } 963 | *out_len = stbiw__sbn(out); 964 | // make returned pointer freeable 965 | STBIW_MEMMOVE(stbiw__sbraw(out), out, *out_len); 966 | return (unsigned char *) stbiw__sbraw(out); 967 | #endif // STBIW_ZLIB_COMPRESS 968 | } 969 | 970 | static unsigned int stbiw__crc32(unsigned char *buffer, int len) 971 | { 972 | #ifdef STBIW_CRC32 973 | return STBIW_CRC32(buffer, len); 974 | #else 975 | static unsigned int crc_table[256] = 976 | { 977 | 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 978 | 0x0eDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 979 | 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 980 | 0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 981 | 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 982 | 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 983 | 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F, 984 | 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 985 | 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, 986 | 0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 987 | 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 988 | 0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 989 | 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 990 | 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 991 | 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, 992 | 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 993 | 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 994 | 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 995 | 0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 996 | 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 997 | 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 998 | 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 999 | 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 1000 | 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 1001 | 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, 1002 | 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 1003 | 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, 1004 | 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 1005 | 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 1006 | 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 1007 | 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 1008 | 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D 1009 | }; 1010 | 1011 | unsigned int crc = ~0u; 1012 | int i; 1013 | for (i=0; i < len; ++i) 1014 | crc = (crc >> 8) ^ crc_table[buffer[i] ^ (crc & 0xff)]; 1015 | return ~crc; 1016 | #endif 1017 | } 1018 | 1019 | #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) 1020 | #define stbiw__wp32(data,v) stbiw__wpng4(data, (v)>>24,(v)>>16,(v)>>8,(v)); 1021 | #define stbiw__wptag(data,s) stbiw__wpng4(data, s[0],s[1],s[2],s[3]) 1022 | 1023 | static void stbiw__wpcrc(unsigned char **data, int len) 1024 | { 1025 | unsigned int crc = stbiw__crc32(*data - len - 4, len+4); 1026 | stbiw__wp32(*data, crc); 1027 | } 1028 | 1029 | static unsigned char stbiw__paeth(int a, int b, int c) 1030 | { 1031 | int p = a + b - c, pa = abs(p-a), pb = abs(p-b), pc = abs(p-c); 1032 | if (pa <= pb && pa <= pc) return STBIW_UCHAR(a); 1033 | if (pb <= pc) return STBIW_UCHAR(b); 1034 | return STBIW_UCHAR(c); 1035 | } 1036 | 1037 | // @OPTIMIZE: provide an option that always forces left-predict or paeth predict 1038 | 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) 1039 | { 1040 | static int mapping[] = { 0,1,2,3,4 }; 1041 | static int firstmap[] = { 0,1,0,5,6 }; 1042 | int *mymap = (y != 0) ? mapping : firstmap; 1043 | int i; 1044 | int type = mymap[filter_type]; 1045 | unsigned char *z = pixels + stride_bytes * (stbi__flip_vertically_on_write ? height-1-y : y); 1046 | int signed_stride = stbi__flip_vertically_on_write ? -stride_bytes : stride_bytes; 1047 | 1048 | if (type==0) { 1049 | memcpy(line_buffer, z, width*n); 1050 | return; 1051 | } 1052 | 1053 | // first loop isn't optimized since it's just one pixel 1054 | for (i = 0; i < n; ++i) { 1055 | switch (type) { 1056 | case 1: line_buffer[i] = z[i]; break; 1057 | case 2: line_buffer[i] = z[i] - z[i-signed_stride]; break; 1058 | case 3: line_buffer[i] = z[i] - (z[i-signed_stride]>>1); break; 1059 | case 4: line_buffer[i] = (signed char) (z[i] - stbiw__paeth(0,z[i-signed_stride],0)); break; 1060 | case 5: line_buffer[i] = z[i]; break; 1061 | case 6: line_buffer[i] = z[i]; break; 1062 | } 1063 | } 1064 | switch (type) { 1065 | case 1: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-n]; break; 1066 | case 2: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - z[i-signed_stride]; break; 1067 | case 3: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - ((z[i-n] + z[i-signed_stride])>>1); break; 1068 | 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; 1069 | case 5: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - (z[i-n]>>1); break; 1070 | case 6: for (i=n; i < width*n; ++i) line_buffer[i] = z[i] - stbiw__paeth(z[i-n], 0,0); break; 1071 | } 1072 | } 1073 | 1074 | STBIWDEF unsigned char *stbi_write_png_to_mem(const unsigned char *pixels, int stride_bytes, int x, int y, int n, int *out_len) 1075 | { 1076 | int force_filter = stbi_write_force_png_filter; 1077 | int ctype[5] = { -1, 0, 4, 2, 6 }; 1078 | unsigned char sig[8] = { 137,80,78,71,13,10,26,10 }; 1079 | unsigned char *out,*o, *filt, *zlib; 1080 | signed char *line_buffer; 1081 | int j,zlen; 1082 | 1083 | if (stride_bytes == 0) 1084 | stride_bytes = x * n; 1085 | 1086 | if (force_filter >= 5) { 1087 | force_filter = -1; 1088 | } 1089 | 1090 | filt = (unsigned char *) STBIW_MALLOC((x*n+1) * y); if (!filt) return 0; 1091 | line_buffer = (signed char *) STBIW_MALLOC(x * n); if (!line_buffer) { STBIW_FREE(filt); return 0; } 1092 | for (j=0; j < y; ++j) { 1093 | int filter_type; 1094 | if (force_filter > -1) { 1095 | filter_type = force_filter; 1096 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, force_filter, line_buffer); 1097 | } else { // Estimate the best filter by running through all of them: 1098 | int best_filter = 0, best_filter_val = 0x7fffffff, est, i; 1099 | for (filter_type = 0; filter_type < 5; filter_type++) { 1100 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, filter_type, line_buffer); 1101 | 1102 | // Estimate the entropy of the line using this filter; the less, the better. 1103 | est = 0; 1104 | for (i = 0; i < x*n; ++i) { 1105 | est += abs((signed char) line_buffer[i]); 1106 | } 1107 | if (est < best_filter_val) { 1108 | best_filter_val = est; 1109 | best_filter = filter_type; 1110 | } 1111 | } 1112 | if (filter_type != best_filter) { // If the last iteration already got us the best filter, don't redo it 1113 | stbiw__encode_png_line((unsigned char*)(pixels), stride_bytes, x, y, j, n, best_filter, line_buffer); 1114 | filter_type = best_filter; 1115 | } 1116 | } 1117 | // when we get here, filter_type contains the filter type, and line_buffer contains the data 1118 | filt[j*(x*n+1)] = (unsigned char) filter_type; 1119 | STBIW_MEMMOVE(filt+j*(x*n+1)+1, line_buffer, x*n); 1120 | } 1121 | STBIW_FREE(line_buffer); 1122 | zlib = stbi_zlib_compress(filt, y*( x*n+1), &zlen, stbi_write_png_compression_level); 1123 | STBIW_FREE(filt); 1124 | if (!zlib) return 0; 1125 | 1126 | // each tag requires 12 bytes of overhead 1127 | out = (unsigned char *) STBIW_MALLOC(8 + 12+13 + 12+zlen + 12); 1128 | if (!out) return 0; 1129 | *out_len = 8 + 12+13 + 12+zlen + 12; 1130 | 1131 | o=out; 1132 | STBIW_MEMMOVE(o,sig,8); o+= 8; 1133 | stbiw__wp32(o, 13); // header length 1134 | stbiw__wptag(o, "IHDR"); 1135 | stbiw__wp32(o, x); 1136 | stbiw__wp32(o, y); 1137 | *o++ = 8; 1138 | *o++ = STBIW_UCHAR(ctype[n]); 1139 | *o++ = 0; 1140 | *o++ = 0; 1141 | *o++ = 0; 1142 | stbiw__wpcrc(&o,13); 1143 | 1144 | stbiw__wp32(o, zlen); 1145 | stbiw__wptag(o, "IDAT"); 1146 | STBIW_MEMMOVE(o, zlib, zlen); 1147 | o += zlen; 1148 | STBIW_FREE(zlib); 1149 | stbiw__wpcrc(&o, zlen); 1150 | 1151 | stbiw__wp32(o,0); 1152 | stbiw__wptag(o, "IEND"); 1153 | stbiw__wpcrc(&o,0); 1154 | 1155 | STBIW_ASSERT(o == out + *out_len); 1156 | 1157 | return out; 1158 | } 1159 | 1160 | #ifndef STBI_WRITE_NO_STDIO 1161 | STBIWDEF int stbi_write_png(char const *filename, int x, int y, int comp, const void *data, int stride_bytes) 1162 | { 1163 | FILE *f; 1164 | int len; 1165 | unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); 1166 | if (png == NULL) return 0; 1167 | 1168 | f = stbiw__fopen(filename, "wb"); 1169 | if (!f) { STBIW_FREE(png); return 0; } 1170 | fwrite(png, 1, len, f); 1171 | fclose(f); 1172 | STBIW_FREE(png); 1173 | return 1; 1174 | } 1175 | #endif 1176 | 1177 | 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) 1178 | { 1179 | int len; 1180 | unsigned char *png = stbi_write_png_to_mem((const unsigned char *) data, stride_bytes, x, y, comp, &len); 1181 | if (png == NULL) return 0; 1182 | func(context, png, len); 1183 | STBIW_FREE(png); 1184 | return 1; 1185 | } 1186 | 1187 | 1188 | /* *************************************************************************** 1189 | * 1190 | * JPEG writer 1191 | * 1192 | * This is based on Jon Olick's jo_jpeg.cpp: 1193 | * public domain Simple, Minimalistic JPEG writer - http://www.jonolick.com/code.html 1194 | */ 1195 | 1196 | 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, 1197 | 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 }; 1198 | 1199 | static void stbiw__jpg_writeBits(stbi__write_context *s, int *bitBufP, int *bitCntP, const unsigned short *bs) { 1200 | int bitBuf = *bitBufP, bitCnt = *bitCntP; 1201 | bitCnt += bs[1]; 1202 | bitBuf |= bs[0] << (24 - bitCnt); 1203 | while(bitCnt >= 8) { 1204 | unsigned char c = (bitBuf >> 16) & 255; 1205 | stbiw__putc(s, c); 1206 | if(c == 255) { 1207 | stbiw__putc(s, 0); 1208 | } 1209 | bitBuf <<= 8; 1210 | bitCnt -= 8; 1211 | } 1212 | *bitBufP = bitBuf; 1213 | *bitCntP = bitCnt; 1214 | } 1215 | 1216 | static void stbiw__jpg_DCT(float *d0p, float *d1p, float *d2p, float *d3p, float *d4p, float *d5p, float *d6p, float *d7p) { 1217 | float d0 = *d0p, d1 = *d1p, d2 = *d2p, d3 = *d3p, d4 = *d4p, d5 = *d5p, d6 = *d6p, d7 = *d7p; 1218 | float z1, z2, z3, z4, z5, z11, z13; 1219 | 1220 | float tmp0 = d0 + d7; 1221 | float tmp7 = d0 - d7; 1222 | float tmp1 = d1 + d6; 1223 | float tmp6 = d1 - d6; 1224 | float tmp2 = d2 + d5; 1225 | float tmp5 = d2 - d5; 1226 | float tmp3 = d3 + d4; 1227 | float tmp4 = d3 - d4; 1228 | 1229 | // Even part 1230 | float tmp10 = tmp0 + tmp3; // phase 2 1231 | float tmp13 = tmp0 - tmp3; 1232 | float tmp11 = tmp1 + tmp2; 1233 | float tmp12 = tmp1 - tmp2; 1234 | 1235 | d0 = tmp10 + tmp11; // phase 3 1236 | d4 = tmp10 - tmp11; 1237 | 1238 | z1 = (tmp12 + tmp13) * 0.707106781f; // c4 1239 | d2 = tmp13 + z1; // phase 5 1240 | d6 = tmp13 - z1; 1241 | 1242 | // Odd part 1243 | tmp10 = tmp4 + tmp5; // phase 2 1244 | tmp11 = tmp5 + tmp6; 1245 | tmp12 = tmp6 + tmp7; 1246 | 1247 | // The rotator is modified from fig 4-8 to avoid extra negations. 1248 | z5 = (tmp10 - tmp12) * 0.382683433f; // c6 1249 | z2 = tmp10 * 0.541196100f + z5; // c2-c6 1250 | z4 = tmp12 * 1.306562965f + z5; // c2+c6 1251 | z3 = tmp11 * 0.707106781f; // c4 1252 | 1253 | z11 = tmp7 + z3; // phase 5 1254 | z13 = tmp7 - z3; 1255 | 1256 | *d5p = z13 + z2; // phase 6 1257 | *d3p = z13 - z2; 1258 | *d1p = z11 + z4; 1259 | *d7p = z11 - z4; 1260 | 1261 | *d0p = d0; *d2p = d2; *d4p = d4; *d6p = d6; 1262 | } 1263 | 1264 | static void stbiw__jpg_calcBits(int val, unsigned short bits[2]) { 1265 | int tmp1 = val < 0 ? -val : val; 1266 | val = val < 0 ? val-1 : val; 1267 | bits[1] = 1; 1268 | while(tmp1 >>= 1) { 1269 | ++bits[1]; 1270 | } 1271 | 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, subsample; 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 | subsample = quality <= 90 ? 1 : 0; 1426 | quality = quality < 1 ? 1 : quality > 100 ? 100 : quality; 1427 | quality = quality < 50 ? 5000 / quality : 200 - quality * 2; 1428 | 1429 | for(i = 0; i < 64; ++i) { 1430 | int uvti, yti = (YQT[i]*quality+50)/100; 1431 | YTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (yti < 1 ? 1 : yti > 255 ? 255 : yti); 1432 | uvti = (UVQT[i]*quality+50)/100; 1433 | UVTable[stbiw__jpg_ZigZag[i]] = (unsigned char) (uvti < 1 ? 1 : uvti > 255 ? 255 : uvti); 1434 | } 1435 | 1436 | for(row = 0, k = 0; row < 8; ++row) { 1437 | for(col = 0; col < 8; ++col, ++k) { 1438 | fdtbl_Y[k] = 1 / (YTable [stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); 1439 | fdtbl_UV[k] = 1 / (UVTable[stbiw__jpg_ZigZag[k]] * aasf[row] * aasf[col]); 1440 | } 1441 | } 1442 | 1443 | // Write Headers 1444 | { 1445 | 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 }; 1446 | static const unsigned char head2[] = { 0xFF,0xDA,0,0xC,3,1,0,2,0x11,3,0x11,0,0x3F,0 }; 1447 | const unsigned char head1[] = { 0xFF,0xC0,0,0x11,8,(unsigned char)(height>>8),STBIW_UCHAR(height),(unsigned char)(width>>8),STBIW_UCHAR(width), 1448 | 3,1,(unsigned char)(subsample?0x22:0x11),0,2,0x11,1,3,0x11,1,0xFF,0xC4,0x01,0xA2,0 }; 1449 | s->func(s->context, (void*)head0, sizeof(head0)); 1450 | s->func(s->context, (void*)YTable, sizeof(YTable)); 1451 | stbiw__putc(s, 1); 1452 | s->func(s->context, UVTable, sizeof(UVTable)); 1453 | s->func(s->context, (void*)head1, sizeof(head1)); 1454 | s->func(s->context, (void*)(std_dc_luminance_nrcodes+1), sizeof(std_dc_luminance_nrcodes)-1); 1455 | s->func(s->context, (void*)std_dc_luminance_values, sizeof(std_dc_luminance_values)); 1456 | stbiw__putc(s, 0x10); // HTYACinfo 1457 | s->func(s->context, (void*)(std_ac_luminance_nrcodes+1), sizeof(std_ac_luminance_nrcodes)-1); 1458 | s->func(s->context, (void*)std_ac_luminance_values, sizeof(std_ac_luminance_values)); 1459 | stbiw__putc(s, 1); // HTUDCinfo 1460 | s->func(s->context, (void*)(std_dc_chrominance_nrcodes+1), sizeof(std_dc_chrominance_nrcodes)-1); 1461 | s->func(s->context, (void*)std_dc_chrominance_values, sizeof(std_dc_chrominance_values)); 1462 | stbiw__putc(s, 0x11); // HTUACinfo 1463 | s->func(s->context, (void*)(std_ac_chrominance_nrcodes+1), sizeof(std_ac_chrominance_nrcodes)-1); 1464 | s->func(s->context, (void*)std_ac_chrominance_values, sizeof(std_ac_chrominance_values)); 1465 | s->func(s->context, (void*)head2, sizeof(head2)); 1466 | } 1467 | 1468 | // Encode 8x8 macroblocks 1469 | { 1470 | static const unsigned short fillBits[] = {0x7F, 7}; 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 | const unsigned char *dataR = (const unsigned char *)data; 1476 | const unsigned char *dataG = dataR + ofsG; 1477 | const unsigned char *dataB = dataR + ofsB; 1478 | int x, y, pos; 1479 | if(subsample) { 1480 | for(y = 0; y < height; y += 16) { 1481 | for(x = 0; x < width; x += 16) { 1482 | float Y[256], U[256], V[256]; 1483 | for(row = y, pos = 0; row < y+16; ++row) { 1484 | // row >= height => use last input row 1485 | int clamped_row = (row < height) ? row : height - 1; 1486 | int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp; 1487 | for(col = x; col < x+16; ++col, ++pos) { 1488 | // if col >= width => use pixel from last input column 1489 | int p = base_p + ((col < width) ? col : (width-1))*comp; 1490 | float r = dataR[p], g = dataG[p], b = dataB[p]; 1491 | Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128; 1492 | U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b; 1493 | V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b; 1494 | } 1495 | } 1496 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+0, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); 1497 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+8, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); 1498 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+128, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); 1499 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y+136, 16, fdtbl_Y, DCY, YDC_HT, YAC_HT); 1500 | 1501 | // subsample U,V 1502 | { 1503 | float subU[64], subV[64]; 1504 | int yy, xx; 1505 | for(yy = 0, pos = 0; yy < 8; ++yy) { 1506 | for(xx = 0; xx < 8; ++xx, ++pos) { 1507 | int j = yy*32+xx*2; 1508 | subU[pos] = (U[j+0] + U[j+1] + U[j+16] + U[j+17]) * 0.25f; 1509 | subV[pos] = (V[j+0] + V[j+1] + V[j+16] + V[j+17]) * 0.25f; 1510 | } 1511 | } 1512 | DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subU, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); 1513 | DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, subV, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); 1514 | } 1515 | } 1516 | } 1517 | } else { 1518 | for(y = 0; y < height; y += 8) { 1519 | for(x = 0; x < width; x += 8) { 1520 | float Y[64], U[64], V[64]; 1521 | for(row = y, pos = 0; row < y+8; ++row) { 1522 | // row >= height => use last input row 1523 | int clamped_row = (row < height) ? row : height - 1; 1524 | int base_p = (stbi__flip_vertically_on_write ? (height-1-clamped_row) : clamped_row)*width*comp; 1525 | for(col = x; col < x+8; ++col, ++pos) { 1526 | // if col >= width => use pixel from last input column 1527 | int p = base_p + ((col < width) ? col : (width-1))*comp; 1528 | float r = dataR[p], g = dataG[p], b = dataB[p]; 1529 | Y[pos]= +0.29900f*r + 0.58700f*g + 0.11400f*b - 128; 1530 | U[pos]= -0.16874f*r - 0.33126f*g + 0.50000f*b; 1531 | V[pos]= +0.50000f*r - 0.41869f*g - 0.08131f*b; 1532 | } 1533 | } 1534 | 1535 | DCY = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, Y, 8, fdtbl_Y, DCY, YDC_HT, YAC_HT); 1536 | DCU = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, U, 8, fdtbl_UV, DCU, UVDC_HT, UVAC_HT); 1537 | DCV = stbiw__jpg_processDU(s, &bitBuf, &bitCnt, V, 8, fdtbl_UV, DCV, UVDC_HT, UVAC_HT); 1538 | } 1539 | } 1540 | } 1541 | 1542 | // Do the bit alignment of the EOI marker 1543 | stbiw__jpg_writeBits(s, &bitBuf, &bitCnt, fillBits); 1544 | } 1545 | 1546 | // EOI 1547 | stbiw__putc(s, 0xFF); 1548 | stbiw__putc(s, 0xD9); 1549 | 1550 | return 1; 1551 | } 1552 | 1553 | STBIWDEF int stbi_write_jpg_to_func(stbi_write_func *func, void *context, int x, int y, int comp, const void *data, int quality) 1554 | { 1555 | stbi__write_context s; 1556 | stbi__start_write_callbacks(&s, func, context); 1557 | return stbi_write_jpg_core(&s, x, y, comp, (void *) data, quality); 1558 | } 1559 | 1560 | 1561 | #ifndef STBI_WRITE_NO_STDIO 1562 | STBIWDEF int stbi_write_jpg(char const *filename, int x, int y, int comp, const void *data, int quality) 1563 | { 1564 | stbi__write_context s; 1565 | if (stbi__start_write_file(&s,filename)) { 1566 | int r = stbi_write_jpg_core(&s, x, y, comp, data, quality); 1567 | stbi__end_write_file(&s); 1568 | return r; 1569 | } else 1570 | return 0; 1571 | } 1572 | #endif 1573 | 1574 | #endif // STB_IMAGE_WRITE_IMPLEMENTATION 1575 | 1576 | /* Revision history 1577 | 1.14 (2020-02-02) updated JPEG writer to downsample chroma channels 1578 | 1.13 1579 | 1.12 1580 | 1.11 (2019-08-11) 1581 | 1582 | 1.10 (2019-02-07) 1583 | support utf8 filenames in Windows; fix warnings and platform ifdefs 1584 | 1.09 (2018-02-11) 1585 | fix typo in zlib quality API, improve STB_I_W_STATIC in C++ 1586 | 1.08 (2018-01-29) 1587 | add stbi__flip_vertically_on_write, external zlib, zlib quality, choose PNG filter 1588 | 1.07 (2017-07-24) 1589 | doc fix 1590 | 1.06 (2017-07-23) 1591 | writing JPEG (using Jon Olick's code) 1592 | 1.05 ??? 1593 | 1.04 (2017-03-03) 1594 | monochrome BMP expansion 1595 | 1.03 ??? 1596 | 1.02 (2016-04-02) 1597 | avoid allocating large structures on the stack 1598 | 1.01 (2016-01-16) 1599 | STBIW_REALLOC_SIZED: support allocators with no realloc support 1600 | avoid race-condition in crc initialization 1601 | minor compile issues 1602 | 1.00 (2015-09-14) 1603 | installable file IO function 1604 | 0.99 (2015-09-13) 1605 | warning fixes; TGA rle support 1606 | 0.98 (2015-04-08) 1607 | added STBIW_MALLOC, STBIW_ASSERT etc 1608 | 0.97 (2015-01-18) 1609 | fixed HDR asserts, rewrote HDR rle logic 1610 | 0.96 (2015-01-17) 1611 | add HDR output 1612 | fix monochrome BMP 1613 | 0.95 (2014-08-17) 1614 | add monochrome TGA output 1615 | 0.94 (2014-05-31) 1616 | rename private functions to avoid conflicts with stb_image.h 1617 | 0.93 (2014-05-27) 1618 | warning fixes 1619 | 0.92 (2010-08-01) 1620 | casts to unsigned char to fix warnings 1621 | 0.91 (2010-07-17) 1622 | first public release 1623 | 0.90 first internal release 1624 | */ 1625 | 1626 | /* 1627 | ------------------------------------------------------------------------------ 1628 | This software is available under 2 licenses -- choose whichever you prefer. 1629 | ------------------------------------------------------------------------------ 1630 | ALTERNATIVE A - MIT License 1631 | Copyright (c) 2017 Sean Barrett 1632 | Permission is hereby granted, free of charge, to any person obtaining a copy of 1633 | this software and associated documentation files (the "Software"), to deal in 1634 | the Software without restriction, including without limitation the rights to 1635 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 1636 | of the Software, and to permit persons to whom the Software is furnished to do 1637 | so, subject to the following conditions: 1638 | The above copyright notice and this permission notice shall be included in all 1639 | copies or substantial portions of the Software. 1640 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1641 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1642 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 1643 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 1644 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 1645 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 1646 | SOFTWARE. 1647 | ------------------------------------------------------------------------------ 1648 | ALTERNATIVE B - Public Domain (www.unlicense.org) 1649 | This is free and unencumbered software released into the public domain. 1650 | Anyone is free to copy, modify, publish, use, compile, sell, or distribute this 1651 | software, either in source code form or as a compiled binary, for any purpose, 1652 | commercial or non-commercial, and by any means. 1653 | In jurisdictions that recognize copyright laws, the author or authors of this 1654 | software dedicate any and all copyright interest in the software to the public 1655 | domain. We make this dedication for the benefit of the public at large and to 1656 | the detriment of our heirs and successors. We intend this dedication to be an 1657 | overt act of relinquishment in perpetuity of all present and future rights to 1658 | this software under copyright law. 1659 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 1660 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 1661 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 1662 | AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 1663 | ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 1664 | WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 1665 | ------------------------------------------------------------------------------ 1666 | */ 1667 | --------------------------------------------------------------------------------