| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "SDL_internal.h" |
| |
| /* General (mostly internal) pixel/color manipulation routines for SDL */ |
| |
| #include "SDL_sysvideo.h" |
| #include "SDL_blit.h" |
| #include "SDL_pixels_c.h" |
| #include "SDL_RLEaccel_c.h" |
| #include "../SDL_list.h" |
| |
| /* Lookup tables to expand partial bytes to the full 0..255 range */ |
| |
| static Uint8 lookup_0[] = { |
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 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, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255 |
| }; |
| |
| static Uint8 lookup_1[] = { |
| 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 255 |
| }; |
| |
| static Uint8 lookup_2[] = { |
| 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145, 149, 153, 157, 161, 165, 170, 174, 178, 182, 186, 190, 194, 198, 202, 206, 210, 214, 218, 222, 226, 230, 234, 238, 242, 246, 250, 255 |
| }; |
| |
| static Uint8 lookup_3[] = { |
| 0, 8, 16, 24, 32, 41, 49, 57, 65, 74, 82, 90, 98, 106, 115, 123, 131, 139, 148, 156, 164, 172, 180, 189, 197, 205, 213, 222, 230, 238, 246, 255 |
| }; |
| |
| static Uint8 lookup_4[] = { |
| 0, 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255 |
| }; |
| |
| static Uint8 lookup_5[] = { |
| 0, 36, 72, 109, 145, 182, 218, 255 |
| }; |
| |
| static Uint8 lookup_6[] = { |
| 0, 85, 170, 255 |
| }; |
| |
| static Uint8 lookup_7[] = { |
| 0, 255 |
| }; |
| |
| static Uint8 lookup_8[] = { |
| 255 |
| }; |
| |
| Uint8 *SDL_expand_byte[9] = { |
| lookup_0, |
| lookup_1, |
| lookup_2, |
| lookup_3, |
| lookup_4, |
| lookup_5, |
| lookup_6, |
| lookup_7, |
| lookup_8 |
| }; |
| |
| /* Lookup tables to expand 8 bit to 10 bit range */ |
| Uint16 SDL_expand_byte10[] = { |
| 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 144, 148, 152, 156, 160, 164, 168, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209, 213, 217, 221, 225, 229, 233, 237, 241, 245, 249, 253, 257, 261, 265, 269, 273, 277, 281, 285, 289, 293, 297, 301, 305, 309, 313, 317, 321, 325, 329, 333, 337, 341, 345, 349, 353, 357, 361, 365, 369, 373, 377, 381, 385, 389, 393, 397, 401, 405, 409, 413, 417, 421, 425, 429, 433, 437, 441, 445, 449, 453, 457, 461, 465, 469, 473, 477, 481, 485, 489, 493, 497, 501, 505, 509, 514, 518, 522, 526, 530, 534, 538, 542, 546, 550, 554, 558, 562, 566, 570, 574, 578, 582, 586, 590, 594, 598, 602, 606, 610, 614, 618, 622, 626, 630, 634, 638, 642, 646, 650, 654, 658, 662, 666, 670, 674, 678, 682, 686, 690, 694, 698, 702, 706, 710, 714, 718, 722, 726, 730, 734, 738, 742, 746, 750, 754, 758, 762, 766, 770, 774, 778, 782, 786, 790, 794, 798, 802, 806, 810, 814, 818, 822, 826, 830, 834, 838, 842, 846, 850, 855, 859, 863, 867, 871, 875, 879, 883, 887, 891, 895, 899, 903, 907, 911, 915, 919, 923, 927, 931, 935, 939, 943, 947, 951, 955, 959, 963, 967, 971, 975, 979, 983, 987, 991, 995, 999, 1003, 1007, 1011, 1015, 1019, 1023 |
| }; |
| |
| /* Helper functions */ |
| |
| #define CASE(X) \ |
| case X: \ |
| return #X; |
| const char *SDL_GetPixelFormatName(SDL_PixelFormatEnum format) |
| { |
| switch (format) { |
| |
| CASE(SDL_PIXELFORMAT_INDEX1LSB) |
| CASE(SDL_PIXELFORMAT_INDEX1MSB) |
| CASE(SDL_PIXELFORMAT_INDEX2LSB) |
| CASE(SDL_PIXELFORMAT_INDEX2MSB) |
| CASE(SDL_PIXELFORMAT_INDEX4LSB) |
| CASE(SDL_PIXELFORMAT_INDEX4MSB) |
| CASE(SDL_PIXELFORMAT_INDEX8) |
| CASE(SDL_PIXELFORMAT_RGB332) |
| CASE(SDL_PIXELFORMAT_RGB444) |
| CASE(SDL_PIXELFORMAT_BGR444) |
| CASE(SDL_PIXELFORMAT_RGB555) |
| CASE(SDL_PIXELFORMAT_BGR555) |
| CASE(SDL_PIXELFORMAT_ARGB4444) |
| CASE(SDL_PIXELFORMAT_RGBA4444) |
| CASE(SDL_PIXELFORMAT_ABGR4444) |
| CASE(SDL_PIXELFORMAT_BGRA4444) |
| CASE(SDL_PIXELFORMAT_ARGB1555) |
| CASE(SDL_PIXELFORMAT_RGBA5551) |
| CASE(SDL_PIXELFORMAT_ABGR1555) |
| CASE(SDL_PIXELFORMAT_BGRA5551) |
| CASE(SDL_PIXELFORMAT_RGB565) |
| CASE(SDL_PIXELFORMAT_BGR565) |
| CASE(SDL_PIXELFORMAT_RGB24) |
| CASE(SDL_PIXELFORMAT_BGR24) |
| CASE(SDL_PIXELFORMAT_XRGB8888) |
| CASE(SDL_PIXELFORMAT_RGBX8888) |
| CASE(SDL_PIXELFORMAT_XBGR8888) |
| CASE(SDL_PIXELFORMAT_BGRX8888) |
| CASE(SDL_PIXELFORMAT_ARGB8888) |
| CASE(SDL_PIXELFORMAT_RGBA8888) |
| CASE(SDL_PIXELFORMAT_ABGR8888) |
| CASE(SDL_PIXELFORMAT_BGRA8888) |
| CASE(SDL_PIXELFORMAT_XRGB2101010) |
| CASE(SDL_PIXELFORMAT_XBGR2101010) |
| CASE(SDL_PIXELFORMAT_ARGB2101010) |
| CASE(SDL_PIXELFORMAT_ABGR2101010) |
| CASE(SDL_PIXELFORMAT_RGB48) |
| CASE(SDL_PIXELFORMAT_BGR48) |
| CASE(SDL_PIXELFORMAT_RGBA64) |
| CASE(SDL_PIXELFORMAT_ARGB64) |
| CASE(SDL_PIXELFORMAT_BGRA64) |
| CASE(SDL_PIXELFORMAT_ABGR64) |
| CASE(SDL_PIXELFORMAT_RGB48_FLOAT) |
| CASE(SDL_PIXELFORMAT_BGR48_FLOAT) |
| CASE(SDL_PIXELFORMAT_RGBA64_FLOAT) |
| CASE(SDL_PIXELFORMAT_ARGB64_FLOAT) |
| CASE(SDL_PIXELFORMAT_BGRA64_FLOAT) |
| CASE(SDL_PIXELFORMAT_ABGR64_FLOAT) |
| CASE(SDL_PIXELFORMAT_RGB96_FLOAT) |
| CASE(SDL_PIXELFORMAT_BGR96_FLOAT) |
| CASE(SDL_PIXELFORMAT_RGBA128_FLOAT) |
| CASE(SDL_PIXELFORMAT_ARGB128_FLOAT) |
| CASE(SDL_PIXELFORMAT_BGRA128_FLOAT) |
| CASE(SDL_PIXELFORMAT_ABGR128_FLOAT) |
| CASE(SDL_PIXELFORMAT_YV12) |
| CASE(SDL_PIXELFORMAT_IYUV) |
| CASE(SDL_PIXELFORMAT_YUY2) |
| CASE(SDL_PIXELFORMAT_UYVY) |
| CASE(SDL_PIXELFORMAT_YVYU) |
| CASE(SDL_PIXELFORMAT_NV12) |
| CASE(SDL_PIXELFORMAT_NV21) |
| CASE(SDL_PIXELFORMAT_P010) |
| CASE(SDL_PIXELFORMAT_EXTERNAL_OES) |
| |
| default: |
| return "SDL_PIXELFORMAT_UNKNOWN"; |
| } |
| } |
| #undef CASE |
| |
| SDL_bool SDL_GetMasksForPixelFormatEnum(SDL_PixelFormatEnum format, int *bpp, Uint32 *Rmask, |
| Uint32 *Gmask, Uint32 *Bmask, Uint32 *Amask) |
| { |
| Uint32 masks[4]; |
| |
| #if SDL_HAVE_YUV |
| /* Partial support for SDL_Surface with FOURCC */ |
| if (SDL_ISPIXELFORMAT_FOURCC(format)) { |
| /* Not a format that uses masks */ |
| *Rmask = *Gmask = *Bmask = *Amask = 0; |
| // however, some of these are packed formats, and can legit declare bits-per-pixel! |
| switch (format) { |
| case SDL_PIXELFORMAT_YUY2: |
| case SDL_PIXELFORMAT_UYVY: |
| case SDL_PIXELFORMAT_YVYU: |
| *bpp = 32; |
| break; |
| default: |
| *bpp = 0; // oh well. |
| } |
| return SDL_TRUE; |
| } |
| #else |
| if (SDL_ISPIXELFORMAT_FOURCC(format)) { |
| SDL_SetError("SDL not built with YUV support"); |
| return SDL_FALSE; |
| } |
| #endif |
| |
| /* Initialize the values here */ |
| if (SDL_BYTESPERPIXEL(format) <= 2) { |
| *bpp = SDL_BITSPERPIXEL(format); |
| } else { |
| *bpp = SDL_BYTESPERPIXEL(format) * 8; |
| } |
| *Rmask = *Gmask = *Bmask = *Amask = 0; |
| |
| if (format == SDL_PIXELFORMAT_RGB24) { |
| #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
| *Rmask = 0x00FF0000; |
| *Gmask = 0x0000FF00; |
| *Bmask = 0x000000FF; |
| #else |
| *Rmask = 0x000000FF; |
| *Gmask = 0x0000FF00; |
| *Bmask = 0x00FF0000; |
| #endif |
| return SDL_TRUE; |
| } |
| |
| if (format == SDL_PIXELFORMAT_BGR24) { |
| #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
| *Rmask = 0x000000FF; |
| *Gmask = 0x0000FF00; |
| *Bmask = 0x00FF0000; |
| #else |
| *Rmask = 0x00FF0000; |
| *Gmask = 0x0000FF00; |
| *Bmask = 0x000000FF; |
| #endif |
| return SDL_TRUE; |
| } |
| |
| if (SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED8 && |
| SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED16 && |
| SDL_PIXELTYPE(format) != SDL_PIXELTYPE_PACKED32) { |
| /* Not a format that uses masks */ |
| return SDL_TRUE; |
| } |
| |
| switch (SDL_PIXELLAYOUT(format)) { |
| case SDL_PACKEDLAYOUT_332: |
| masks[0] = 0x00000000; |
| masks[1] = 0x000000E0; |
| masks[2] = 0x0000001C; |
| masks[3] = 0x00000003; |
| break; |
| case SDL_PACKEDLAYOUT_4444: |
| masks[0] = 0x0000F000; |
| masks[1] = 0x00000F00; |
| masks[2] = 0x000000F0; |
| masks[3] = 0x0000000F; |
| break; |
| case SDL_PACKEDLAYOUT_1555: |
| masks[0] = 0x00008000; |
| masks[1] = 0x00007C00; |
| masks[2] = 0x000003E0; |
| masks[3] = 0x0000001F; |
| break; |
| case SDL_PACKEDLAYOUT_5551: |
| masks[0] = 0x0000F800; |
| masks[1] = 0x000007C0; |
| masks[2] = 0x0000003E; |
| masks[3] = 0x00000001; |
| break; |
| case SDL_PACKEDLAYOUT_565: |
| masks[0] = 0x00000000; |
| masks[1] = 0x0000F800; |
| masks[2] = 0x000007E0; |
| masks[3] = 0x0000001F; |
| break; |
| case SDL_PACKEDLAYOUT_8888: |
| masks[0] = 0xFF000000; |
| masks[1] = 0x00FF0000; |
| masks[2] = 0x0000FF00; |
| masks[3] = 0x000000FF; |
| break; |
| case SDL_PACKEDLAYOUT_2101010: |
| masks[0] = 0xC0000000; |
| masks[1] = 0x3FF00000; |
| masks[2] = 0x000FFC00; |
| masks[3] = 0x000003FF; |
| break; |
| case SDL_PACKEDLAYOUT_1010102: |
| masks[0] = 0xFFC00000; |
| masks[1] = 0x003FF000; |
| masks[2] = 0x00000FFC; |
| masks[3] = 0x00000003; |
| break; |
| default: |
| SDL_SetError("Unknown pixel format"); |
| return SDL_FALSE; |
| } |
| |
| switch (SDL_PIXELORDER(format)) { |
| case SDL_PACKEDORDER_XRGB: |
| *Rmask = masks[1]; |
| *Gmask = masks[2]; |
| *Bmask = masks[3]; |
| break; |
| case SDL_PACKEDORDER_RGBX: |
| *Rmask = masks[0]; |
| *Gmask = masks[1]; |
| *Bmask = masks[2]; |
| break; |
| case SDL_PACKEDORDER_ARGB: |
| *Amask = masks[0]; |
| *Rmask = masks[1]; |
| *Gmask = masks[2]; |
| *Bmask = masks[3]; |
| break; |
| case SDL_PACKEDORDER_RGBA: |
| *Rmask = masks[0]; |
| *Gmask = masks[1]; |
| *Bmask = masks[2]; |
| *Amask = masks[3]; |
| break; |
| case SDL_PACKEDORDER_XBGR: |
| *Bmask = masks[1]; |
| *Gmask = masks[2]; |
| *Rmask = masks[3]; |
| break; |
| case SDL_PACKEDORDER_BGRX: |
| *Bmask = masks[0]; |
| *Gmask = masks[1]; |
| *Rmask = masks[2]; |
| break; |
| case SDL_PACKEDORDER_BGRA: |
| *Bmask = masks[0]; |
| *Gmask = masks[1]; |
| *Rmask = masks[2]; |
| *Amask = masks[3]; |
| break; |
| case SDL_PACKEDORDER_ABGR: |
| *Amask = masks[0]; |
| *Bmask = masks[1]; |
| *Gmask = masks[2]; |
| *Rmask = masks[3]; |
| break; |
| default: |
| SDL_SetError("Unknown pixel format"); |
| return SDL_FALSE; |
| } |
| return SDL_TRUE; |
| } |
| |
| SDL_PixelFormatEnum SDL_GetPixelFormatEnumForMasks(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) |
| { |
| switch (bpp) { |
| case 1: |
| /* SDL defaults to MSB ordering */ |
| return SDL_PIXELFORMAT_INDEX1MSB; |
| case 2: |
| /* SDL defaults to MSB ordering */ |
| return SDL_PIXELFORMAT_INDEX2MSB; |
| case 4: |
| /* SDL defaults to MSB ordering */ |
| return SDL_PIXELFORMAT_INDEX4MSB; |
| case 8: |
| if (Rmask == 0xE0 && |
| Gmask == 0x1C && |
| Bmask == 0x03 && |
| Amask == 0x00) { |
| return SDL_PIXELFORMAT_RGB332; |
| } |
| return SDL_PIXELFORMAT_INDEX8; |
| case 12: |
| if (Rmask == 0) { |
| return SDL_PIXELFORMAT_RGB444; |
| } |
| if (Rmask == 0x0F00 && |
| Gmask == 0x00F0 && |
| Bmask == 0x000F && |
| Amask == 0x0000) { |
| return SDL_PIXELFORMAT_RGB444; |
| } |
| if (Rmask == 0x000F && |
| Gmask == 0x00F0 && |
| Bmask == 0x0F00 && |
| Amask == 0x0000) { |
| return SDL_PIXELFORMAT_BGR444; |
| } |
| break; |
| case 15: |
| if (Rmask == 0) { |
| return SDL_PIXELFORMAT_RGB555; |
| } |
| SDL_FALLTHROUGH; |
| case 16: |
| if (Rmask == 0) { |
| return SDL_PIXELFORMAT_RGB565; |
| } |
| if (Rmask == 0x7C00 && |
| Gmask == 0x03E0 && |
| Bmask == 0x001F && |
| Amask == 0x0000) { |
| return SDL_PIXELFORMAT_RGB555; |
| } |
| if (Rmask == 0x001F && |
| Gmask == 0x03E0 && |
| Bmask == 0x7C00 && |
| Amask == 0x0000) { |
| return SDL_PIXELFORMAT_BGR555; |
| } |
| if (Rmask == 0x0F00 && |
| Gmask == 0x00F0 && |
| Bmask == 0x000F && |
| Amask == 0xF000) { |
| return SDL_PIXELFORMAT_ARGB4444; |
| } |
| if (Rmask == 0xF000 && |
| Gmask == 0x0F00 && |
| Bmask == 0x00F0 && |
| Amask == 0x000F) { |
| return SDL_PIXELFORMAT_RGBA4444; |
| } |
| if (Rmask == 0x000F && |
| Gmask == 0x00F0 && |
| Bmask == 0x0F00 && |
| Amask == 0xF000) { |
| return SDL_PIXELFORMAT_ABGR4444; |
| } |
| if (Rmask == 0x00F0 && |
| Gmask == 0x0F00 && |
| Bmask == 0xF000 && |
| Amask == 0x000F) { |
| return SDL_PIXELFORMAT_BGRA4444; |
| } |
| if (Rmask == 0x7C00 && |
| Gmask == 0x03E0 && |
| Bmask == 0x001F && |
| Amask == 0x8000) { |
| return SDL_PIXELFORMAT_ARGB1555; |
| } |
| if (Rmask == 0xF800 && |
| Gmask == 0x07C0 && |
| Bmask == 0x003E && |
| Amask == 0x0001) { |
| return SDL_PIXELFORMAT_RGBA5551; |
| } |
| if (Rmask == 0x001F && |
| Gmask == 0x03E0 && |
| Bmask == 0x7C00 && |
| Amask == 0x8000) { |
| return SDL_PIXELFORMAT_ABGR1555; |
| } |
| if (Rmask == 0x003E && |
| Gmask == 0x07C0 && |
| Bmask == 0xF800 && |
| Amask == 0x0001) { |
| return SDL_PIXELFORMAT_BGRA5551; |
| } |
| if (Rmask == 0xF800 && |
| Gmask == 0x07E0 && |
| Bmask == 0x001F && |
| Amask == 0x0000) { |
| return SDL_PIXELFORMAT_RGB565; |
| } |
| if (Rmask == 0x001F && |
| Gmask == 0x07E0 && |
| Bmask == 0xF800 && |
| Amask == 0x0000) { |
| return SDL_PIXELFORMAT_BGR565; |
| } |
| if (Rmask == 0x003F && |
| Gmask == 0x07C0 && |
| Bmask == 0xF800 && |
| Amask == 0x0000) { |
| /* Technically this would be BGR556, but Witek says this works in bug 3158 */ |
| return SDL_PIXELFORMAT_RGB565; |
| } |
| break; |
| case 24: |
| switch (Rmask) { |
| case 0: |
| case 0x00FF0000: |
| #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
| return SDL_PIXELFORMAT_RGB24; |
| #else |
| return SDL_PIXELFORMAT_BGR24; |
| #endif |
| case 0x000000FF: |
| #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
| return SDL_PIXELFORMAT_BGR24; |
| #else |
| return SDL_PIXELFORMAT_RGB24; |
| #endif |
| } |
| break; |
| case 30: |
| if (Rmask == 0x3FF00000 && |
| Gmask == 0x000FFC00 && |
| Bmask == 0x000003FF && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_XRGB2101010; |
| } |
| if (Rmask == 0x000003FF && |
| Gmask == 0x000FFC00 && |
| Bmask == 0x3FF00000 && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_XBGR2101010; |
| } |
| break; |
| case 32: |
| if (Rmask == 0) { |
| return SDL_PIXELFORMAT_XRGB8888; |
| } |
| if (Rmask == 0x00FF0000 && |
| Gmask == 0x0000FF00 && |
| Bmask == 0x000000FF && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_XRGB8888; |
| } |
| if (Rmask == 0xFF000000 && |
| Gmask == 0x00FF0000 && |
| Bmask == 0x0000FF00 && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_RGBX8888; |
| } |
| if (Rmask == 0x000000FF && |
| Gmask == 0x0000FF00 && |
| Bmask == 0x00FF0000 && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_XBGR8888; |
| } |
| if (Rmask == 0x0000FF00 && |
| Gmask == 0x00FF0000 && |
| Bmask == 0xFF000000 && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_BGRX8888; |
| } |
| if (Rmask == 0x00FF0000 && |
| Gmask == 0x0000FF00 && |
| Bmask == 0x000000FF && |
| Amask == 0xFF000000) { |
| return SDL_PIXELFORMAT_ARGB8888; |
| } |
| if (Rmask == 0xFF000000 && |
| Gmask == 0x00FF0000 && |
| Bmask == 0x0000FF00 && |
| Amask == 0x000000FF) { |
| return SDL_PIXELFORMAT_RGBA8888; |
| } |
| if (Rmask == 0x000000FF && |
| Gmask == 0x0000FF00 && |
| Bmask == 0x00FF0000 && |
| Amask == 0xFF000000) { |
| return SDL_PIXELFORMAT_ABGR8888; |
| } |
| if (Rmask == 0x0000FF00 && |
| Gmask == 0x00FF0000 && |
| Bmask == 0xFF000000 && |
| Amask == 0x000000FF) { |
| return SDL_PIXELFORMAT_BGRA8888; |
| } |
| if (Rmask == 0x3FF00000 && |
| Gmask == 0x000FFC00 && |
| Bmask == 0x000003FF && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_XRGB2101010; |
| } |
| if (Rmask == 0x000003FF && |
| Gmask == 0x000FFC00 && |
| Bmask == 0x3FF00000 && |
| Amask == 0x00000000) { |
| return SDL_PIXELFORMAT_XBGR2101010; |
| } |
| if (Rmask == 0x3FF00000 && |
| Gmask == 0x000FFC00 && |
| Bmask == 0x000003FF && |
| Amask == 0xC0000000) { |
| return SDL_PIXELFORMAT_ARGB2101010; |
| } |
| if (Rmask == 0x000003FF && |
| Gmask == 0x000FFC00 && |
| Bmask == 0x3FF00000 && |
| Amask == 0xC0000000) { |
| return SDL_PIXELFORMAT_ABGR2101010; |
| } |
| break; |
| } |
| return SDL_PIXELFORMAT_UNKNOWN; |
| } |
| |
| static SDL_PixelFormat *formats; |
| static SDL_SpinLock formats_lock = 0; |
| |
| SDL_PixelFormat *SDL_CreatePixelFormat(SDL_PixelFormatEnum pixel_format) |
| { |
| SDL_PixelFormat *format; |
| |
| SDL_LockSpinlock(&formats_lock); |
| |
| /* Look it up in our list of previously allocated formats */ |
| for (format = formats; format; format = format->next) { |
| if (pixel_format == format->format) { |
| ++format->refcount; |
| SDL_UnlockSpinlock(&formats_lock); |
| return format; |
| } |
| } |
| |
| /* Allocate an empty pixel format structure, and initialize it */ |
| format = (SDL_PixelFormat *)SDL_malloc(sizeof(*format)); |
| if (!format) { |
| SDL_UnlockSpinlock(&formats_lock); |
| return NULL; |
| } |
| if (SDL_InitFormat(format, pixel_format) < 0) { |
| SDL_UnlockSpinlock(&formats_lock); |
| SDL_free(format); |
| return NULL; |
| } |
| |
| if (!SDL_ISPIXELFORMAT_INDEXED(pixel_format)) { |
| /* Cache the RGB formats */ |
| format->next = formats; |
| formats = format; |
| } |
| |
| SDL_UnlockSpinlock(&formats_lock); |
| |
| return format; |
| } |
| |
| int SDL_InitFormat(SDL_PixelFormat *format, SDL_PixelFormatEnum pixel_format) |
| { |
| int bpp; |
| Uint32 Rmask, Gmask, Bmask, Amask; |
| Uint32 mask; |
| |
| if (!SDL_GetMasksForPixelFormatEnum(pixel_format, &bpp, |
| &Rmask, &Gmask, &Bmask, &Amask)) { |
| return -1; |
| } |
| |
| /* Set up the format */ |
| SDL_zerop(format); |
| format->format = pixel_format; |
| format->bits_per_pixel = (Uint8)bpp; |
| format->bytes_per_pixel = (Uint8)((bpp + 7) / 8); |
| |
| format->Rmask = Rmask; |
| format->Rshift = 0; |
| format->Rloss = 8; |
| if (Rmask) { |
| for (mask = Rmask; !(mask & 0x01); mask >>= 1) { |
| ++format->Rshift; |
| } |
| for (; (mask & 0x01) && format->Rloss; mask >>= 1) { |
| --format->Rloss; |
| } |
| } |
| |
| format->Gmask = Gmask; |
| format->Gshift = 0; |
| format->Gloss = 8; |
| if (Gmask) { |
| for (mask = Gmask; !(mask & 0x01); mask >>= 1) { |
| ++format->Gshift; |
| } |
| for (; (mask & 0x01) && format->Gloss; mask >>= 1) { |
| --format->Gloss; |
| } |
| } |
| |
| format->Bmask = Bmask; |
| format->Bshift = 0; |
| format->Bloss = 8; |
| if (Bmask) { |
| for (mask = Bmask; !(mask & 0x01); mask >>= 1) { |
| ++format->Bshift; |
| } |
| for (; (mask & 0x01) && format->Bloss; mask >>= 1) { |
| --format->Bloss; |
| } |
| } |
| |
| format->Amask = Amask; |
| format->Ashift = 0; |
| format->Aloss = 8; |
| if (Amask) { |
| for (mask = Amask; !(mask & 0x01); mask >>= 1) { |
| ++format->Ashift; |
| } |
| for (; (mask & 0x01) && format->Aloss; mask >>= 1) { |
| --format->Aloss; |
| } |
| } |
| |
| format->palette = NULL; |
| format->refcount = 1; |
| format->next = NULL; |
| |
| return 0; |
| } |
| |
| void SDL_DestroyPixelFormat(SDL_PixelFormat *format) |
| { |
| SDL_PixelFormat *prev; |
| |
| if (!format) { |
| return; |
| } |
| |
| SDL_LockSpinlock(&formats_lock); |
| |
| if (--format->refcount > 0) { |
| SDL_UnlockSpinlock(&formats_lock); |
| return; |
| } |
| |
| /* Remove this format from our list */ |
| if (format == formats) { |
| formats = format->next; |
| } else if (formats) { |
| for (prev = formats; prev->next; prev = prev->next) { |
| if (prev->next == format) { |
| prev->next = format->next; |
| break; |
| } |
| } |
| } |
| |
| SDL_UnlockSpinlock(&formats_lock); |
| |
| if (format->palette) { |
| SDL_DestroyPalette(format->palette); |
| } |
| SDL_free(format); |
| return; |
| } |
| |
| SDL_Colorspace SDL_GetDefaultColorspaceForFormat(SDL_PixelFormatEnum format) |
| { |
| if (SDL_ISPIXELFORMAT_FOURCC(format)) { |
| if (format == SDL_PIXELFORMAT_P010) { |
| return SDL_COLORSPACE_HDR10; |
| } else { |
| return SDL_COLORSPACE_YUV_DEFAULT; |
| } |
| } else if (SDL_ISPIXELFORMAT_FLOAT(format)) { |
| return SDL_COLORSPACE_SRGB_LINEAR; |
| } else if (SDL_ISPIXELFORMAT_10BIT(format)) { |
| return SDL_COLORSPACE_HDR10; |
| } else { |
| return SDL_COLORSPACE_RGB_DEFAULT; |
| } |
| } |
| |
| float SDL_sRGBtoLinear(float v) |
| { |
| if (v <= 0.04045f) { |
| v = (v / 12.92f); |
| } else { |
| v = SDL_powf((v + 0.055f) / 1.055f, 2.4f); |
| } |
| return v; |
| } |
| |
| float SDL_sRGBfromLinear(float v) |
| { |
| if (v <= 0.0031308f) { |
| v = (v * 12.92f); |
| } else { |
| v = (SDL_powf(v, 1.0f / 2.4f) * 1.055f - 0.055f); |
| } |
| return v; |
| } |
| |
| float SDL_PQtoNits(float v) |
| { |
| const float c1 = 0.8359375f; |
| const float c2 = 18.8515625f; |
| const float c3 = 18.6875f; |
| const float oo_m1 = 1.0f / 0.1593017578125f; |
| const float oo_m2 = 1.0f / 78.84375f; |
| |
| float num = SDL_max(SDL_powf(v, oo_m2) - c1, 0.0f); |
| float den = c2 - c3 * SDL_powf(v, oo_m2); |
| return 10000.0f * SDL_powf(num / den, oo_m1); |
| } |
| |
| float SDL_PQfromNits(float v) |
| { |
| const float c1 = 0.8359375f; |
| const float c2 = 18.8515625f; |
| const float c3 = 18.6875f; |
| const float m1 = 0.1593017578125f; |
| const float m2 = 78.84375f; |
| |
| float y = SDL_clamp(v / 10000.0f, 0.0f, 1.0f); |
| float num = c1 + c2 * SDL_powf(y, m1); |
| float den = 1.0f + c3 * SDL_powf(y, m1); |
| return SDL_powf(num / den, m2); |
| } |
| |
| /* This is a helpful tool for deriving these: |
| * https://kdashg.github.io/misc/colors/from-coeffs.html |
| */ |
| static const float mat_BT601_Limited_8bit[] = { |
| -0.0627451017f, -0.501960814f, -0.501960814f, 0.0f, /* offset */ |
| 1.1644f, 0.0000f, 1.5960f, 0.0f, /* Rcoeff */ |
| 1.1644f, -0.3918f, -0.8130f, 0.0f, /* Gcoeff */ |
| 1.1644f, 2.0172f, 0.0000f, 0.0f, /* Bcoeff */ |
| }; |
| |
| static const float mat_BT601_Full_8bit[] = { |
| 0.0f, -0.501960814f, -0.501960814f, 0.0f, /* offset */ |
| 1.0000f, 0.0000f, 1.4020f, 0.0f, /* Rcoeff */ |
| 1.0000f, -0.3441f, -0.7141f, 0.0f, /* Gcoeff */ |
| 1.0000f, 1.7720f, 0.0000f, 0.0f, /* Bcoeff */ |
| }; |
| |
| static const float mat_BT709_Limited_8bit[] = { |
| -0.0627451017f, -0.501960814f, -0.501960814f, 0.0f, /* offset */ |
| 1.1644f, 0.0000f, 1.7927f, 0.0f, /* Rcoeff */ |
| 1.1644f, -0.2132f, -0.5329f, 0.0f, /* Gcoeff */ |
| 1.1644f, 2.1124f, 0.0000f, 0.0f, /* Bcoeff */ |
| }; |
| |
| static const float mat_BT709_Full_8bit[] = { |
| 0.0f, -0.501960814f, -0.501960814f, 0.0f, /* offset */ |
| 1.0000f, 0.0000f, 1.5748f, 0.0f, /* Rcoeff */ |
| 1.0000f, -0.1873f, -0.4681f, 0.0f, /* Gcoeff */ |
| 1.0000f, 1.8556f, 0.0000f, 0.0f, /* Bcoeff */ |
| }; |
| |
| static const float mat_BT2020_Limited_10bit[] = { |
| -0.062561095f, -0.500488759f, -0.500488759f, 0.0f, /* offset */ |
| 1.1678f, 0.0000f, 1.6836f, 0.0f, /* Rcoeff */ |
| 1.1678f, -0.1879f, -0.6523f, 0.0f, /* Gcoeff */ |
| 1.1678f, 2.1481f, 0.0000f, 0.0f, /* Bcoeff */ |
| }; |
| |
| static const float mat_BT2020_Full_10bit[] = { |
| 0.0f, -0.500488759f, -0.500488759f, 0.0f, /* offset */ |
| 1.0000f, 0.0000f, 1.4760f, 0.0f, /* Rcoeff */ |
| 1.0000f, -0.1647f, -0.5719f, 0.0f, /* Gcoeff */ |
| 1.0000f, 1.8832f, 0.0000f, 0.0f, /* Bcoeff */ |
| }; |
| |
| static const float *SDL_GetBT601ConversionMatrix( SDL_Colorspace colorspace ) |
| { |
| switch (SDL_COLORSPACERANGE(colorspace)) { |
| case SDL_COLOR_RANGE_LIMITED: |
| case SDL_COLOR_RANGE_UNKNOWN: |
| return mat_BT601_Limited_8bit; |
| case SDL_COLOR_RANGE_FULL: |
| return mat_BT601_Full_8bit; |
| default: |
| break; |
| } |
| return NULL; |
| } |
| |
| static const float *SDL_GetBT709ConversionMatrix(SDL_Colorspace colorspace) |
| { |
| switch (SDL_COLORSPACERANGE(colorspace)) { |
| case SDL_COLOR_RANGE_LIMITED: |
| case SDL_COLOR_RANGE_UNKNOWN: |
| return mat_BT709_Limited_8bit; |
| case SDL_COLOR_RANGE_FULL: |
| return mat_BT709_Full_8bit; |
| default: |
| break; |
| } |
| return NULL; |
| } |
| |
| static const float *SDL_GetBT2020ConversionMatrix(SDL_Colorspace colorspace) |
| { |
| switch (SDL_COLORSPACERANGE(colorspace)) { |
| case SDL_COLOR_RANGE_LIMITED: |
| case SDL_COLOR_RANGE_UNKNOWN: |
| return mat_BT2020_Limited_10bit; |
| case SDL_COLOR_RANGE_FULL: |
| return mat_BT2020_Full_10bit; |
| default: |
| break; |
| } |
| return NULL; |
| } |
| |
| const float *SDL_GetYCbCRtoRGBConversionMatrix(SDL_Colorspace colorspace, int w, int h, int bits_per_pixel) |
| { |
| const int YUV_SD_THRESHOLD = 576; |
| |
| switch (SDL_COLORSPACEMATRIX(colorspace)) { |
| case SDL_MATRIX_COEFFICIENTS_BT601: |
| case SDL_MATRIX_COEFFICIENTS_BT470BG: |
| return SDL_GetBT601ConversionMatrix(colorspace); |
| |
| case SDL_MATRIX_COEFFICIENTS_BT709: |
| return SDL_GetBT709ConversionMatrix(colorspace); |
| |
| case SDL_MATRIX_COEFFICIENTS_BT2020_NCL: |
| return SDL_GetBT2020ConversionMatrix(colorspace); |
| |
| case SDL_MATRIX_COEFFICIENTS_UNSPECIFIED: |
| switch (bits_per_pixel) { |
| case 8: |
| if (h <= YUV_SD_THRESHOLD) { |
| return SDL_GetBT601ConversionMatrix(colorspace); |
| } else { |
| return SDL_GetBT709ConversionMatrix(colorspace); |
| } |
| case 10: |
| case 16: |
| return SDL_GetBT2020ConversionMatrix(colorspace); |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| return NULL; |
| } |
| |
| const float *SDL_GetColorPrimariesConversionMatrix(SDL_ColorPrimaries src, SDL_ColorPrimaries dst) |
| { |
| /* Conversion matrices generated using gamescope color helpers and the primaries definitions at: |
| * https://www.itu.int/rec/T-REC-H.273-201612-S/en |
| * |
| * You can also generate these online using the RGB-XYZ matrix calculator, and then multiplying |
| * XYZ_to_dst * src_to_XYZ to get the combined conversion matrix: |
| * https://www.russellcottrell.com/photo/matrixCalculator.htm |
| */ |
| static const float mat601to709[] = { |
| 0.939542f, 0.050181f, 0.010277f, |
| 0.017772f, 0.965793f, 0.016435f, |
| -0.001622f, -0.004370f, 1.005991f, |
| }; |
| static const float mat601to2020[] = { |
| 0.595254f, 0.349314f, 0.055432f, |
| 0.081244f, 0.891503f, 0.027253f, |
| 0.015512f, 0.081912f, 0.902576f, |
| }; |
| static const float mat709to601[] = { |
| 1.065379f, -0.055401f, -0.009978f, |
| -0.019633f, 1.036363f, -0.016731f, |
| 0.001632f, 0.004412f, 0.993956f, |
| }; |
| static const float mat709to2020[] = { |
| 0.627404f, 0.329283f, 0.043313f, |
| 0.069097f, 0.919541f, 0.011362f, |
| 0.016391f, 0.088013f, 0.895595f, |
| }; |
| static const float mat2020to601[] = { |
| 1.776133f, -0.687820f, -0.088313f, |
| -0.161376f, 1.187315f, -0.025940f, |
| -0.015881f, -0.095931f, 1.111812f, |
| }; |
| static const float mat2020to709[] = { |
| 1.660496f, -0.587656f, -0.072840f, |
| -0.124547f, 1.132895f, -0.008348f, |
| -0.018154f, -0.100597f, 1.118751f |
| }; |
| static const float matSMPTE431to709[] = { |
| 1.120713f, -0.234649f, 0.000000f, |
| -0.038478f, 1.087034f, 0.000000f, |
| -0.017967f, -0.082030f, 0.954576f, |
| }; |
| static const float matSMPTE431to2020[] = { |
| 0.689691f, 0.207169f, 0.041346f, |
| 0.041852f, 0.982426f, 0.010846f, |
| -0.001107f, 0.018362f, 0.854914f, |
| }; |
| static const float matSMPTE432to709[] = { |
| 1.224940f, -0.224940f, -0.000000f, |
| -0.042057f, 1.042057f, 0.000000f, |
| -0.019638f, -0.078636f, 1.098273f, |
| }; |
| static const float matSMPTE432to2020[] = { |
| 0.753833f, 0.198597f, 0.047570f, |
| 0.045744f, 0.941777f, 0.012479f, |
| -0.001210f, 0.017602f, 0.983609f, |
| }; |
| |
| switch (dst) { |
| case SDL_COLOR_PRIMARIES_BT601: |
| case SDL_COLOR_PRIMARIES_SMPTE240: |
| switch (src) { |
| case SDL_COLOR_PRIMARIES_BT709: |
| return mat709to601; |
| case SDL_COLOR_PRIMARIES_BT2020: |
| return mat2020to601; |
| default: |
| break; |
| } |
| break; |
| case SDL_COLOR_PRIMARIES_BT709: |
| switch (src) { |
| case SDL_COLOR_PRIMARIES_BT601: |
| case SDL_COLOR_PRIMARIES_SMPTE240: |
| return mat601to709; |
| case SDL_COLOR_PRIMARIES_BT2020: |
| return mat2020to709; |
| case SDL_COLOR_PRIMARIES_SMPTE431: |
| return matSMPTE431to709; |
| case SDL_COLOR_PRIMARIES_SMPTE432: |
| return matSMPTE432to709; |
| default: |
| break; |
| } |
| break; |
| case SDL_COLOR_PRIMARIES_BT2020: |
| switch (src) { |
| case SDL_COLOR_PRIMARIES_BT601: |
| case SDL_COLOR_PRIMARIES_SMPTE240: |
| return mat601to2020; |
| case SDL_COLOR_PRIMARIES_BT709: |
| return mat709to2020; |
| case SDL_COLOR_PRIMARIES_SMPTE431: |
| return matSMPTE431to2020; |
| case SDL_COLOR_PRIMARIES_SMPTE432: |
| return matSMPTE432to2020; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| return NULL; |
| } |
| |
| void SDL_ConvertColorPrimaries(float *fR, float *fG, float *fB, const float *matrix) |
| { |
| float v[3]; |
| |
| v[0] = *fR; |
| v[1] = *fG; |
| v[2] = *fB; |
| |
| *fR = matrix[0 * 3 + 0] * v[0] + matrix[0 * 3 + 1] * v[1] + matrix[0 * 3 + 2] * v[2]; |
| *fG = matrix[1 * 3 + 0] * v[0] + matrix[1 * 3 + 1] * v[1] + matrix[1 * 3 + 2] * v[2]; |
| *fB = matrix[2 * 3 + 0] * v[0] + matrix[2 * 3 + 1] * v[1] + matrix[2 * 3 + 2] * v[2]; |
| } |
| |
| SDL_Palette *SDL_CreatePalette(int ncolors) |
| { |
| SDL_Palette *palette; |
| |
| /* Input validation */ |
| if (ncolors < 1) { |
| SDL_InvalidParamError("ncolors"); |
| return NULL; |
| } |
| |
| palette = (SDL_Palette *)SDL_malloc(sizeof(*palette)); |
| if (!palette) { |
| return NULL; |
| } |
| palette->colors = |
| (SDL_Color *)SDL_malloc(ncolors * sizeof(*palette->colors)); |
| if (!palette->colors) { |
| SDL_free(palette); |
| return NULL; |
| } |
| palette->ncolors = ncolors; |
| palette->version = 1; |
| palette->refcount = 1; |
| |
| SDL_memset(palette->colors, 0xFF, ncolors * sizeof(*palette->colors)); |
| |
| return palette; |
| } |
| |
| int SDL_SetPixelFormatPalette(SDL_PixelFormat *format, SDL_Palette *palette) |
| { |
| if (!format) { |
| return SDL_InvalidParamError("SDL_SetPixelFormatPalette(): format"); |
| } |
| |
| if (palette && palette->ncolors > (1 << format->bits_per_pixel)) { |
| return SDL_SetError("SDL_SetPixelFormatPalette() passed a palette that doesn't match the format"); |
| } |
| |
| if (format->palette == palette) { |
| return 0; |
| } |
| |
| if (format->palette) { |
| SDL_DestroyPalette(format->palette); |
| } |
| |
| format->palette = palette; |
| |
| if (format->palette) { |
| ++format->palette->refcount; |
| } |
| |
| return 0; |
| } |
| |
| int SDL_SetPaletteColors(SDL_Palette *palette, const SDL_Color *colors, |
| int firstcolor, int ncolors) |
| { |
| int status = 0; |
| |
| /* Verify the parameters */ |
| if (!palette) { |
| return -1; |
| } |
| if (ncolors > (palette->ncolors - firstcolor)) { |
| ncolors = (palette->ncolors - firstcolor); |
| status = -1; |
| } |
| |
| if (colors != (palette->colors + firstcolor)) { |
| SDL_memcpy(palette->colors + firstcolor, colors, |
| ncolors * sizeof(*colors)); |
| } |
| ++palette->version; |
| if (!palette->version) { |
| palette->version = 1; |
| } |
| |
| return status; |
| } |
| |
| void SDL_DestroyPalette(SDL_Palette *palette) |
| { |
| if (!palette) { |
| return; |
| } |
| if (--palette->refcount > 0) { |
| return; |
| } |
| SDL_free(palette->colors); |
| SDL_free(palette); |
| } |
| |
| /* |
| * Calculate an 8-bit (3 red, 3 green, 2 blue) dithered palette of colors |
| */ |
| void SDL_DitherColors(SDL_Color *colors, int bpp) |
| { |
| int i; |
| if (bpp != 8) { |
| return; /* only 8bpp supported right now */ |
| } |
| |
| for (i = 0; i < 256; i++) { |
| int r, g, b; |
| /* map each bit field to the full [0, 255] interval, |
| so 0 is mapped to (0, 0, 0) and 255 to (255, 255, 255) */ |
| r = i & 0xe0; |
| r |= r >> 3 | r >> 6; |
| colors[i].r = (Uint8)r; |
| g = (i << 3) & 0xe0; |
| g |= g >> 3 | g >> 6; |
| colors[i].g = (Uint8)g; |
| b = i & 0x3; |
| b |= b << 2; |
| b |= b << 4; |
| colors[i].b = (Uint8)b; |
| colors[i].a = SDL_ALPHA_OPAQUE; |
| } |
| } |
| |
| /* |
| * Match an RGB value to a particular palette index |
| */ |
| Uint8 SDL_FindColor(SDL_Palette *pal, Uint8 r, Uint8 g, Uint8 b, Uint8 a) |
| { |
| /* Do colorspace distance matching */ |
| unsigned int smallest; |
| unsigned int distance; |
| int rd, gd, bd, ad; |
| int i; |
| Uint8 pixel = 0; |
| |
| smallest = ~0U; |
| for (i = 0; i < pal->ncolors; ++i) { |
| rd = pal->colors[i].r - r; |
| gd = pal->colors[i].g - g; |
| bd = pal->colors[i].b - b; |
| ad = pal->colors[i].a - a; |
| distance = (rd * rd) + (gd * gd) + (bd * bd) + (ad * ad); |
| if (distance < smallest) { |
| pixel = (Uint8)i; |
| if (distance == 0) { /* Perfect match! */ |
| break; |
| } |
| smallest = distance; |
| } |
| } |
| return pixel; |
| } |
| |
| /* Tell whether palette is opaque, and if it has an alpha_channel */ |
| void SDL_DetectPalette(SDL_Palette *pal, SDL_bool *is_opaque, SDL_bool *has_alpha_channel) |
| { |
| int i; |
| |
| { |
| SDL_bool all_opaque = SDL_TRUE; |
| for (i = 0; i < pal->ncolors; i++) { |
| Uint8 alpha_value = pal->colors[i].a; |
| if (alpha_value != SDL_ALPHA_OPAQUE) { |
| all_opaque = SDL_FALSE; |
| break; |
| } |
| } |
| |
| if (all_opaque) { |
| /* Palette is opaque, with an alpha channel */ |
| *is_opaque = SDL_TRUE; |
| *has_alpha_channel = SDL_TRUE; |
| return; |
| } |
| } |
| |
| { |
| SDL_bool all_transparent = SDL_TRUE; |
| for (i = 0; i < pal->ncolors; i++) { |
| Uint8 alpha_value = pal->colors[i].a; |
| if (alpha_value != SDL_ALPHA_TRANSPARENT) { |
| all_transparent = SDL_FALSE; |
| break; |
| } |
| } |
| |
| if (all_transparent) { |
| /* Palette is opaque, without an alpha channel */ |
| *is_opaque = SDL_TRUE; |
| *has_alpha_channel = SDL_FALSE; |
| return; |
| } |
| } |
| |
| /* Palette has alpha values */ |
| *is_opaque = SDL_FALSE; |
| *has_alpha_channel = SDL_TRUE; |
| } |
| |
| /* Find the opaque pixel value corresponding to an RGB triple */ |
| Uint32 SDL_MapRGB(const SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b) |
| { |
| if (!format) { |
| SDL_InvalidParamError("format"); |
| return 0; |
| } |
| if (format->palette) { |
| return SDL_FindColor(format->palette, r, g, b, SDL_ALPHA_OPAQUE); |
| } else if (SDL_ISPIXELFORMAT_10BIT(format->format)) { |
| return (((Uint32)SDL_expand_byte10[r]) << format->Rshift) | |
| (((Uint32)SDL_expand_byte10[g]) << format->Gshift) | |
| (((Uint32)SDL_expand_byte10[b]) << format->Bshift) | |
| format->Amask; |
| } else { |
| return (r >> format->Rloss) << format->Rshift | (g >> format->Gloss) << format->Gshift | (b >> format->Bloss) << format->Bshift | format->Amask; |
| } |
| } |
| |
| /* Find the pixel value corresponding to an RGBA quadruple */ |
| Uint32 SDL_MapRGBA(const SDL_PixelFormat *format, Uint8 r, Uint8 g, Uint8 b, |
| Uint8 a) |
| { |
| if (!format) { |
| SDL_InvalidParamError("format"); |
| return 0; |
| } |
| if (format->palette) { |
| return SDL_FindColor(format->palette, r, g, b, a); |
| } else if (SDL_ISPIXELFORMAT_10BIT(format->format)) { |
| return (((Uint32)SDL_expand_byte10[r]) << format->Rshift) | |
| (((Uint32)SDL_expand_byte10[g]) << format->Gshift) | |
| (((Uint32)SDL_expand_byte10[b]) << format->Bshift) | |
| ((Uint32)(a >> format->Aloss) << format->Ashift & format->Amask); |
| } else { |
| return (r >> format->Rloss) << format->Rshift | (g >> format->Gloss) << format->Gshift | (b >> format->Bloss) << format->Bshift | ((Uint32)(a >> format->Aloss) << format->Ashift & format->Amask); |
| } |
| } |
| |
| void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat *format, Uint8 *r, Uint8 *g, |
| Uint8 *b) |
| { |
| if (format->palette) { |
| if (pixel < (unsigned)format->palette->ncolors) { |
| *r = format->palette->colors[pixel].r; |
| *g = format->palette->colors[pixel].g; |
| *b = format->palette->colors[pixel].b; |
| } else { |
| *r = *g = *b = 0; |
| } |
| } else if (SDL_ISPIXELFORMAT_10BIT(format->format)) { |
| unsigned v; |
| v = (pixel & format->Rmask) >> format->Rshift; |
| *r = (Uint8)(v >> 2); |
| v = (pixel & format->Gmask) >> format->Gshift; |
| *g = (Uint8)(v >> 2); |
| v = (pixel & format->Bmask) >> format->Bshift; |
| *b = (Uint8)(v >> 2); |
| } else { |
| unsigned v; |
| v = (pixel & format->Rmask) >> format->Rshift; |
| *r = SDL_expand_byte[format->Rloss][v]; |
| v = (pixel & format->Gmask) >> format->Gshift; |
| *g = SDL_expand_byte[format->Gloss][v]; |
| v = (pixel & format->Bmask) >> format->Bshift; |
| *b = SDL_expand_byte[format->Bloss][v]; |
| } |
| } |
| |
| void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat *format, |
| Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) |
| { |
| if (format->palette) { |
| if (pixel < (unsigned)format->palette->ncolors) { |
| *r = format->palette->colors[pixel].r; |
| *g = format->palette->colors[pixel].g; |
| *b = format->palette->colors[pixel].b; |
| *a = format->palette->colors[pixel].a; |
| } else { |
| *r = *g = *b = *a = 0; |
| } |
| } else if (SDL_ISPIXELFORMAT_10BIT(format->format)) { |
| unsigned v; |
| v = (pixel & format->Rmask) >> format->Rshift; |
| *r = (Uint8)(v >> 2); |
| v = (pixel & format->Gmask) >> format->Gshift; |
| *g = (Uint8)(v >> 2); |
| v = (pixel & format->Bmask) >> format->Bshift; |
| *b = (Uint8)(v >> 2); |
| v = (pixel & format->Amask) >> format->Ashift; |
| *a = SDL_expand_byte[format->Aloss][v]; |
| } else { |
| unsigned v; |
| v = (pixel & format->Rmask) >> format->Rshift; |
| *r = SDL_expand_byte[format->Rloss][v]; |
| v = (pixel & format->Gmask) >> format->Gshift; |
| *g = SDL_expand_byte[format->Gloss][v]; |
| v = (pixel & format->Bmask) >> format->Bshift; |
| *b = SDL_expand_byte[format->Bloss][v]; |
| v = (pixel & format->Amask) >> format->Ashift; |
| *a = SDL_expand_byte[format->Aloss][v]; |
| } |
| } |
| |
| /* Map from Palette to Palette */ |
| static Uint8 *Map1to1(SDL_Palette *src, SDL_Palette *dst, int *identical) |
| { |
| Uint8 *map; |
| int i; |
| |
| if (identical) { |
| if (src->ncolors <= dst->ncolors) { |
| /* If an identical palette, no need to map */ |
| if (src == dst || |
| (SDL_memcmp(src->colors, dst->colors, |
| src->ncolors * sizeof(SDL_Color)) == 0)) { |
| *identical = 1; |
| return NULL; |
| } |
| } |
| *identical = 0; |
| } |
| map = (Uint8 *)SDL_calloc(256, sizeof(Uint8)); |
| if (!map) { |
| return NULL; |
| } |
| for (i = 0; i < src->ncolors; ++i) { |
| map[i] = SDL_FindColor(dst, |
| src->colors[i].r, src->colors[i].g, |
| src->colors[i].b, src->colors[i].a); |
| } |
| return map; |
| } |
| |
| /* Map from Palette to BitField */ |
| static Uint8 *Map1toN(SDL_PixelFormat *src, Uint8 Rmod, Uint8 Gmod, Uint8 Bmod, Uint8 Amod, |
| SDL_PixelFormat *dst) |
| { |
| Uint8 *map; |
| int i; |
| int bpp; |
| SDL_Palette *pal = src->palette; |
| |
| bpp = ((dst->bytes_per_pixel == 3) ? 4 : dst->bytes_per_pixel); |
| map = (Uint8 *)SDL_calloc(256, bpp); |
| if (!map) { |
| return NULL; |
| } |
| |
| /* We memory copy to the pixel map so the endianness is preserved */ |
| for (i = 0; i < pal->ncolors; ++i) { |
| Uint8 R = (Uint8)((pal->colors[i].r * Rmod) / 255); |
| Uint8 G = (Uint8)((pal->colors[i].g * Gmod) / 255); |
| Uint8 B = (Uint8)((pal->colors[i].b * Bmod) / 255); |
| Uint8 A = (Uint8)((pal->colors[i].a * Amod) / 255); |
| ASSEMBLE_RGBA(&map[i * bpp], dst->bytes_per_pixel, dst, (Uint32)R, |
| (Uint32)G, (Uint32)B, (Uint32)A); |
| } |
| return map; |
| } |
| |
| /* Map from BitField to Dithered-Palette to Palette */ |
| static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical) |
| { |
| /* Generate a 256 color dither palette */ |
| SDL_Palette dithered; |
| SDL_Color colors[256]; |
| SDL_Palette *pal = dst->palette; |
| |
| dithered.ncolors = 256; |
| SDL_DitherColors(colors, 8); |
| dithered.colors = colors; |
| return Map1to1(&dithered, pal, identical); |
| } |
| |
| SDL_BlitMap *SDL_AllocBlitMap(void) |
| { |
| SDL_BlitMap *map; |
| |
| /* Allocate the empty map */ |
| map = (SDL_BlitMap *)SDL_calloc(1, sizeof(*map)); |
| if (!map) { |
| return NULL; |
| } |
| map->info.r = 0xFF; |
| map->info.g = 0xFF; |
| map->info.b = 0xFF; |
| map->info.a = 0xFF; |
| |
| /* It's ready to go */ |
| return map; |
| } |
| |
| void SDL_InvalidateAllBlitMap(SDL_Surface *surface) |
| { |
| SDL_ListNode *l = (SDL_ListNode *)surface->list_blitmap; |
| |
| surface->list_blitmap = NULL; |
| |
| while (l) { |
| SDL_ListNode *tmp = l; |
| SDL_InvalidateMap((SDL_BlitMap *)l->entry); |
| l = l->next; |
| SDL_free(tmp); |
| } |
| } |
| |
| void SDL_InvalidateMap(SDL_BlitMap *map) |
| { |
| if (!map) { |
| return; |
| } |
| if (map->dst) { |
| /* Un-register from the destination surface */ |
| SDL_ListRemove((SDL_ListNode **)&(map->dst->list_blitmap), map); |
| } |
| map->dst = NULL; |
| map->src_palette_version = 0; |
| map->dst_palette_version = 0; |
| SDL_free(map->info.table); |
| map->info.table = NULL; |
| } |
| |
| int SDL_MapSurface(SDL_Surface *src, SDL_Surface *dst) |
| { |
| SDL_PixelFormat *srcfmt; |
| SDL_PixelFormat *dstfmt; |
| SDL_BlitMap *map; |
| |
| /* Clear out any previous mapping */ |
| map = src->map; |
| #if SDL_HAVE_RLE |
| if ((src->flags & SDL_RLEACCEL) == SDL_RLEACCEL) { |
| SDL_UnRLESurface(src, 1); |
| } |
| #endif |
| SDL_InvalidateMap(map); |
| |
| /* Figure out what kind of mapping we're doing */ |
| map->identity = 0; |
| srcfmt = src->format; |
| dstfmt = dst->format; |
| if (SDL_ISPIXELFORMAT_INDEXED(srcfmt->format)) { |
| if (SDL_ISPIXELFORMAT_INDEXED(dstfmt->format)) { |
| /* Palette --> Palette */ |
| map->info.table = |
| Map1to1(srcfmt->palette, dstfmt->palette, &map->identity); |
| if (!map->identity) { |
| if (!map->info.table) { |
| return -1; |
| } |
| } |
| if (srcfmt->bits_per_pixel != dstfmt->bits_per_pixel) { |
| map->identity = 0; |
| } |
| } else { |
| /* Palette --> BitField */ |
| map->info.table = |
| Map1toN(srcfmt, src->map->info.r, src->map->info.g, |
| src->map->info.b, src->map->info.a, dstfmt); |
| if (!map->info.table) { |
| return -1; |
| } |
| } |
| } else { |
| if (SDL_ISPIXELFORMAT_INDEXED(dstfmt->format)) { |
| /* BitField --> Palette */ |
| map->info.table = MapNto1(srcfmt, dstfmt, &map->identity); |
| if (!map->identity) { |
| if (!map->info.table) { |
| return -1; |
| } |
| } |
| map->identity = 0; /* Don't optimize to copy */ |
| } else { |
| /* BitField --> BitField */ |
| if (srcfmt == dstfmt) { |
| map->identity = 1; |
| } |
| } |
| } |
| |
| map->dst = dst; |
| |
| if (map->dst) { |
| /* Register BlitMap to the destination surface, to be invalidated when needed */ |
| SDL_ListAdd((SDL_ListNode **)&(map->dst->list_blitmap), map); |
| } |
| |
| if (dstfmt->palette) { |
| map->dst_palette_version = dstfmt->palette->version; |
| } else { |
| map->dst_palette_version = 0; |
| } |
| |
| if (srcfmt->palette) { |
| map->src_palette_version = srcfmt->palette->version; |
| } else { |
| map->src_palette_version = 0; |
| } |
| |
| /* Choose your blitters wisely */ |
| return SDL_CalculateBlit(src); |
| } |
| |
| void SDL_FreeBlitMap(SDL_BlitMap *map) |
| { |
| if (map) { |
| SDL_InvalidateMap(map); |
| SDL_free(map); |
| } |
| } |
| |
