From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Sat, 27 Dec 2025 12:03:39 -0800 Subject: Initial commit --- contrib/SDL-3.2.8/src/video/SDL_pixels.c | 1530 ++++++++++++++++++++++++++++++ 1 file changed, 1530 insertions(+) create mode 100644 contrib/SDL-3.2.8/src/video/SDL_pixels.c (limited to 'contrib/SDL-3.2.8/src/video/SDL_pixels.c') diff --git a/contrib/SDL-3.2.8/src/video/SDL_pixels.c b/contrib/SDL-3.2.8/src/video/SDL_pixels.c new file mode 100644 index 0000000..5fede22 --- /dev/null +++ b/contrib/SDL-3.2.8/src/video/SDL_pixels.c @@ -0,0 +1,1530 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2025 Sam Lantinga + + 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_pixels_c.h" +#include "SDL_RLEaccel_c.h" + +// Lookup tables to expand partial bytes to the full 0..255 range + +static const Uint8 lookup_0[] = { + 255 +}; + +static const Uint8 lookup_1[] = { + 0, 255 +}; + +static const Uint8 lookup_2[] = { + 0, 85, 170, 255 +}; + +static const Uint8 lookup_3[] = { + 0, 36, 72, 109, 145, 182, 218, 255 +}; + +static const Uint8 lookup_4[] = { + 0, 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255 +}; + +static const Uint8 lookup_5[] = { + 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 const Uint8 lookup_6[] = { + 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 const Uint8 lookup_7[] = { + 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 const Uint8 lookup_8[] = { + 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 +}; + +const 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 +const Uint16 SDL_expand_byte_10[] = { + 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 +}; +SDL_COMPILE_TIME_ASSERT(SDL_expand_byte_10_size, SDL_arraysize(SDL_expand_byte_10) == (1 << 8)); + + +// Helper functions + +#define CASE(X) \ + case X: \ + return #X; +const char *SDL_GetPixelFormatName(SDL_PixelFormat 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_XRGB4444) + CASE(SDL_PIXELFORMAT_XBGR4444) + CASE(SDL_PIXELFORMAT_XRGB1555) + CASE(SDL_PIXELFORMAT_XBGR1555) + 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) + CASE(SDL_PIXELFORMAT_MJPG) + + default: + return "SDL_PIXELFORMAT_UNKNOWN"; + } +} +#undef CASE + +bool SDL_GetMasksForPixelFormat(SDL_PixelFormat format, int *bpp, Uint32 *Rmask, Uint32 *Gmask, Uint32 *Bmask, Uint32 *Amask) +{ + Uint32 masks[4]; + +#ifdef 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 true; + } +#else + if (SDL_ISPIXELFORMAT_FOURCC(format)) { + return SDL_SetError("SDL not built with YUV support"); + } +#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 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 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 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: + return SDL_SetError("Unknown pixel format"); + } + + 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: + return SDL_SetError("Unknown pixel format"); + } + return true; +} + +SDL_PixelFormat SDL_GetPixelFormatForMasks(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_XRGB4444; + } + if (Rmask == 0x0F00 && + Gmask == 0x00F0 && + Bmask == 0x000F && + Amask == 0x0000) { + return SDL_PIXELFORMAT_XRGB4444; + } + if (Rmask == 0x000F && + Gmask == 0x00F0 && + Bmask == 0x0F00 && + Amask == 0x0000) { + return SDL_PIXELFORMAT_XBGR4444; + } + break; + case 15: + if (Rmask == 0) { + return SDL_PIXELFORMAT_XRGB1555; + } + SDL_FALLTHROUGH; + case 16: + if (Rmask == 0) { + return SDL_PIXELFORMAT_RGB565; + } + if (Rmask == 0x7C00 && + Gmask == 0x03E0 && + Bmask == 0x001F && + Amask == 0x0000) { + return SDL_PIXELFORMAT_XRGB1555; + } + if (Rmask == 0x001F && + Gmask == 0x03E0 && + Bmask == 0x7C00 && + Amask == 0x0000) { + return SDL_PIXELFORMAT_XBGR1555; + } + 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_InitState SDL_format_details_init; +static SDL_HashTable *SDL_format_details; + +static bool SDL_InitPixelFormatDetails(SDL_PixelFormatDetails *details, SDL_PixelFormat format) +{ + int bpp; + Uint32 Rmask, Gmask, Bmask, Amask; + Uint32 mask; + + if (!SDL_GetMasksForPixelFormat(format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) { + return false; + } + + // Set up the format + SDL_zerop(details); + details->format = format; + details->bits_per_pixel = (Uint8)bpp; + details->bytes_per_pixel = (Uint8)((bpp + 7) / 8); + + details->Rmask = Rmask; + details->Rshift = 0; + details->Rbits = 0; + if (Rmask) { + for (mask = Rmask; !(mask & 0x01); mask >>= 1) { + ++details->Rshift; + } + for (; (mask & 0x01); mask >>= 1) { + ++details->Rbits; + } + } + + details->Gmask = Gmask; + details->Gshift = 0; + details->Gbits = 0; + if (Gmask) { + for (mask = Gmask; !(mask & 0x01); mask >>= 1) { + ++details->Gshift; + } + for (; (mask & 0x01); mask >>= 1) { + ++details->Gbits; + } + } + + details->Bmask = Bmask; + details->Bshift = 0; + details->Bbits = 0; + if (Bmask) { + for (mask = Bmask; !(mask & 0x01); mask >>= 1) { + ++details->Bshift; + } + for (; (mask & 0x01); mask >>= 1) { + ++details->Bbits; + } + } + + details->Amask = Amask; + details->Ashift = 0; + details->Abits = 0; + if (Amask) { + for (mask = Amask; !(mask & 0x01); mask >>= 1) { + ++details->Ashift; + } + for (; (mask & 0x01); mask >>= 1) { + ++details->Abits; + } + } + + return true; +} + +const SDL_PixelFormatDetails *SDL_GetPixelFormatDetails(SDL_PixelFormat format) +{ + SDL_PixelFormatDetails *details; + + if (SDL_ShouldInit(&SDL_format_details_init)) { + SDL_format_details = SDL_CreateHashTable(0, true, SDL_HashID, SDL_KeyMatchID, SDL_DestroyHashValue, NULL); + if (!SDL_format_details) { + SDL_SetInitialized(&SDL_format_details_init, false); + return NULL; + } + SDL_SetInitialized(&SDL_format_details_init, true); + } + + if (SDL_FindInHashTable(SDL_format_details, (const void *)(uintptr_t)format, (const void **)&details)) { + return details; + } + + // Allocate an empty pixel format structure, and initialize it + details = (SDL_PixelFormatDetails *)SDL_malloc(sizeof(*details)); + if (!details) { + return NULL; + } + + if (!SDL_InitPixelFormatDetails(details, format)) { + SDL_free(details); + return NULL; + } + + if (!SDL_InsertIntoHashTable(SDL_format_details, (const void *)(uintptr_t)format, (void *)details, false)) { + SDL_free(details); + // uh...did another thread beat us to inserting this? + if (SDL_FindInHashTable(SDL_format_details, (const void *)(uintptr_t)format, (const void **)&details)) { + return details; + } + return NULL; // oh well. + } + + return details; +} + +void SDL_QuitPixelFormatDetails(void) +{ + if (SDL_ShouldQuit(&SDL_format_details_init)) { + SDL_DestroyHashTable(SDL_format_details); + SDL_format_details = NULL; + SDL_SetInitialized(&SDL_format_details_init, false); + } +} + +SDL_Colorspace SDL_GetDefaultColorspaceForFormat(SDL_PixelFormat format) +{ + if (SDL_ISPIXELFORMAT_FOURCC(format)) { + if (format == SDL_PIXELFORMAT_MJPG) { + return SDL_COLORSPACE_SRGB; + } else 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, 1.4075f, 0.0f, // Rcoeff + 1.0000f, -0.3455f, -0.7169f, 0.0f, // Gcoeff + 1.0000f, 1.7790f, 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, 1.5810f, 0.0f, // Rcoeff + 1.0000f, -0.1881f, -0.4700f, 0.0f, // Gcoeff + 1.0000f, 1.8629f, 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; +} + +bool SDL_SetPaletteColors(SDL_Palette *palette, const SDL_Color *colors, int firstcolor, int ncolors) +{ + bool result = true; + + // Verify the parameters + if (!palette) { + return false; + } + if (ncolors > (palette->ncolors - firstcolor)) { + ncolors = (palette->ncolors - firstcolor); + result = false; + } + + if (colors != (palette->colors + firstcolor)) { + SDL_memcpy(palette->colors + firstcolor, colors, + ncolors * sizeof(*colors)); + } + ++palette->version; + if (!palette->version) { + palette->version = 1; + } + + return result; +} + +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_DitherPalette(SDL_Palette *palette) +{ + int i; + if (palette->ncolors != 256) { + return; // only 8bpp supported right now + } + + for (i = 0; i < palette->ncolors; 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; + palette->colors[i].r = (Uint8)r; + g = (i << 3) & 0xe0; + g |= g >> 3 | g >> 6; + palette->colors[i].g = (Uint8)g; + b = i & 0x3; + b |= b << 2; + b |= b << 4; + palette->colors[i].b = (Uint8)b; + palette->colors[i].a = SDL_ALPHA_OPAQUE; + } +} + +/* + * Match an RGB value to a particular palette index + */ +Uint8 SDL_FindColor(const 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; +} + +Uint8 SDL_LookupRGBAColor(SDL_HashTable *palette_map, Uint32 pixel, const SDL_Palette *pal) +{ + Uint8 color_index = 0; + const void *value; + if (SDL_FindInHashTable(palette_map, (const void *)(uintptr_t)pixel, &value)) { + color_index = (Uint8)(uintptr_t)value; + } else { + Uint8 r = (Uint8)((pixel >> 24) & 0xFF); + Uint8 g = (Uint8)((pixel >> 16) & 0xFF); + Uint8 b = (Uint8)((pixel >> 8) & 0xFF); + Uint8 a = (Uint8)((pixel >> 0) & 0xFF); + color_index = SDL_FindColor(pal, r, g, b, a); + SDL_InsertIntoHashTable(palette_map, (const void *)(uintptr_t)pixel, (const void *)(uintptr_t)color_index, true); + } + return color_index; +} + +// Tell whether palette is opaque, and if it has an alpha_channel +void SDL_DetectPalette(const SDL_Palette *pal, bool *is_opaque, bool *has_alpha_channel) +{ + int i; + + { + bool all_opaque = true; + for (i = 0; i < pal->ncolors; i++) { + Uint8 alpha_value = pal->colors[i].a; + if (alpha_value != SDL_ALPHA_OPAQUE) { + all_opaque = false; + break; + } + } + + if (all_opaque) { + // Palette is opaque, with an alpha channel + *is_opaque = true; + *has_alpha_channel = true; + return; + } + } + + { + bool all_transparent = true; + for (i = 0; i < pal->ncolors; i++) { + Uint8 alpha_value = pal->colors[i].a; + if (alpha_value != SDL_ALPHA_TRANSPARENT) { + all_transparent = false; + break; + } + } + + if (all_transparent) { + // Palette is opaque, without an alpha channel + *is_opaque = true; + *has_alpha_channel = false; + return; + } + } + + // Palette has alpha values + *is_opaque = false; + *has_alpha_channel = true; +} + +// Find the opaque pixel value corresponding to an RGB triple +Uint32 SDL_MapRGB(const SDL_PixelFormatDetails *format, const SDL_Palette *palette, Uint8 r, Uint8 g, Uint8 b) +{ + if (!format) { + SDL_InvalidParamError("format"); + return 0; + } + + if (SDL_ISPIXELFORMAT_INDEXED(format->format)) { + if (!palette) { + SDL_InvalidParamError("palette"); + return 0; + } + return SDL_FindColor(palette, r, g, b, SDL_ALPHA_OPAQUE); + } + + if (SDL_ISPIXELFORMAT_10BIT(format->format)) { + return (((Uint32)SDL_expand_byte_10[r]) << format->Rshift) | + (((Uint32)SDL_expand_byte_10[g]) << format->Gshift) | + (((Uint32)SDL_expand_byte_10[b]) << format->Bshift) | + format->Amask; + } else { + return ((Uint32)(r >> (8 - format->Rbits))) << format->Rshift | + ((Uint32)(g >> (8 - format->Gbits))) << format->Gshift | + ((Uint32)(b >> (8 - format->Bbits))) << format->Bshift | + format->Amask; + } +} + +// Find the pixel value corresponding to an RGBA quadruple +Uint32 SDL_MapRGBA(const SDL_PixelFormatDetails *format, const SDL_Palette *palette, Uint8 r, Uint8 g, Uint8 b, Uint8 a) +{ + if (!format) { + SDL_InvalidParamError("format"); + return 0; + } + + if (SDL_ISPIXELFORMAT_INDEXED(format->format)) { + if (!palette) { + SDL_InvalidParamError("palette"); + return 0; + } + return SDL_FindColor(palette, r, g, b, a); + } + + if (SDL_ISPIXELFORMAT_10BIT(format->format)) { + return (((Uint32)SDL_expand_byte_10[r]) << format->Rshift) | + (((Uint32)SDL_expand_byte_10[g]) << format->Gshift) | + (((Uint32)SDL_expand_byte_10[b]) << format->Bshift) | + ((((Uint32)(a >> (8 - format->Abits))) << format->Ashift) & format->Amask); + } else { + return ((Uint32)(r >> (8 - format->Rbits))) << format->Rshift | + ((Uint32)(g >> (8 - format->Gbits))) << format->Gshift | + ((Uint32)(b >> (8 - format->Bbits))) << format->Bshift | + ((((Uint32)(a >> (8 - format->Abits))) << format->Ashift) & format->Amask); + } +} + +void SDL_GetRGB(Uint32 pixel, const SDL_PixelFormatDetails *format, const SDL_Palette *palette, Uint8 *r, Uint8 *g, Uint8 *b) +{ + Uint8 unused; + + if (!r) { + r = &unused; + } + if (!g) { + g = &unused; + } + if (!b) { + b = &unused; + } + + if (!format) { + *r = *g = *b = 0; + return; + } + + if (SDL_ISPIXELFORMAT_INDEXED(format->format)) { + if (palette && pixel < (unsigned)palette->ncolors) { + *r = palette->colors[pixel].r; + *g = palette->colors[pixel].g; + *b = palette->colors[pixel].b; + } else { + *r = *g = *b = 0; + } + return; + } + + 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->Rbits][v]; + v = (pixel & format->Gmask) >> format->Gshift; + *g = SDL_expand_byte[format->Gbits][v]; + v = (pixel & format->Bmask) >> format->Bshift; + *b = SDL_expand_byte[format->Bbits][v]; + } +} + +void SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormatDetails *format, const SDL_Palette *palette, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a) +{ + Uint8 unused; + + if (!r) { + r = &unused; + } + if (!g) { + g = &unused; + } + if (!b) { + b = &unused; + } + if (!a) { + a = &unused; + } + + if (!format) { + *r = *g = *b = *a = 0; + return; + } + + if (SDL_ISPIXELFORMAT_INDEXED(format->format)) { + if (palette && pixel < (unsigned)palette->ncolors) { + *r = palette->colors[pixel].r; + *g = palette->colors[pixel].g; + *b = palette->colors[pixel].b; + *a = palette->colors[pixel].a; + } else { + *r = *g = *b = *a = 0; + } + return; + } + + 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->Abits][v]; + } else { + unsigned v; + v = (pixel & format->Rmask) >> format->Rshift; + *r = SDL_expand_byte[format->Rbits][v]; + v = (pixel & format->Gmask) >> format->Gshift; + *g = SDL_expand_byte[format->Gbits][v]; + v = (pixel & format->Bmask) >> format->Bshift; + *b = SDL_expand_byte[format->Bbits][v]; + v = (pixel & format->Amask) >> format->Ashift; + *a = SDL_expand_byte[format->Abits][v]; + } +} + +// Map from Palette to Palette +static Uint8 *Map1to1(const SDL_Palette *src, const 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(const SDL_Palette *pal, Uint8 Rmod, Uint8 Gmod, Uint8 Bmod, Uint8 Amod, const SDL_PixelFormatDetails *dst) +{ + Uint8 *map; + int i; + int bpp; + + if (!pal) { + SDL_SetError("src does not have a palette set"); + return NULL; + } + + bpp = ((SDL_BYTESPERPIXEL(dst->format) == 3) ? 4 : SDL_BYTESPERPIXEL(dst->format)); + 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], SDL_BYTESPERPIXEL(dst->format), dst, (Uint32)R, + (Uint32)G, (Uint32)B, (Uint32)A); + } + return map; +} + +bool SDL_ValidateMap(SDL_Surface *src, SDL_Surface *dst) +{ + SDL_BlitMap *map = &src->map; + + if (map->info.dst_fmt != dst->fmt || + map->info.dst_pal != dst->palette || + (dst->palette && + map->dst_palette_version != dst->palette->version) || + (src->palette && + map->src_palette_version != src->palette->version)) { + if (!SDL_MapSurface(src, dst)) { + return false; + } + // just here for debugging + // printf + // ("src = 0x%08X src->flags = %08X map->info.flags = %08x\ndst = 0x%08X dst->flags = %08X dst->map.info.flags = %08X\nmap->blit = 0x%08x\n", + // src, dst->flags, map->info.flags, dst, dst->flags, + // dst->map.info.flags, map->blit); + } else { + map->info.dst_surface = dst; + } + return true; +} + +void SDL_InvalidateMap(SDL_BlitMap *map) +{ + map->info.dst_fmt = NULL; + map->info.dst_pal = NULL; + map->src_palette_version = 0; + map->dst_palette_version = 0; + if (map->info.table) { + SDL_free(map->info.table); + map->info.table = NULL; + } + if (map->info.palette_map) { + SDL_DestroyHashTable(map->info.palette_map); + map->info.palette_map = NULL; + } +} + +bool SDL_MapSurface(SDL_Surface *src, SDL_Surface *dst) +{ + const SDL_PixelFormatDetails *srcfmt; + const SDL_Palette *srcpal; + const SDL_PixelFormatDetails *dstfmt; + const SDL_Palette *dstpal; + SDL_BlitMap *map; + + // Clear out any previous mapping + map = &src->map; +#ifdef SDL_HAVE_RLE + if (src->internal_flags & SDL_INTERNAL_SURFACE_RLEACCEL) { + SDL_UnRLESurface(src, true); + } +#endif + SDL_InvalidateMap(map); + + // Figure out what kind of mapping we're doing + map->identity = 0; + srcfmt = src->fmt; + srcpal = src->palette; + dstfmt = dst->fmt; + dstpal = dst->palette; + if (SDL_ISPIXELFORMAT_INDEXED(srcfmt->format)) { + if (SDL_ISPIXELFORMAT_INDEXED(dstfmt->format)) { + // Palette --> Palette + if (srcpal && dstpal) { + map->info.table = Map1to1(srcpal, dstpal, &map->identity); + } else { + map->identity = 1; + } + if (!map->identity) { + if (!map->info.table) { + return false; + } + } + if (srcfmt->bits_per_pixel != dstfmt->bits_per_pixel) { + map->identity = 0; + } + } else { + // Palette --> BitField + map->info.table = + Map1toN(srcpal, src->map.info.r, src->map.info.g, + src->map.info.b, src->map.info.a, dstfmt); + if (!map->info.table) { + return false; + } + } + } else { + if (SDL_ISPIXELFORMAT_INDEXED(dstfmt->format)) { + // BitField --> Palette + map->info.palette_map = SDL_CreateHashTable(0, false, SDL_HashID, SDL_KeyMatchID, NULL, NULL); + } else { + // BitField --> BitField + if (srcfmt == dstfmt) { + map->identity = 1; + } + } + } + + if (dstpal) { + map->dst_palette_version = dstpal->version; + } else { + map->dst_palette_version = 0; + } + + if (srcpal) { + map->src_palette_version = srcpal->version; + } else { + map->src_palette_version = 0; + } + + // Choose your blitters wisely + return SDL_CalculateBlit(src, dst); +} + -- cgit v1.2.3