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Diffstat (limited to '3rdparty/SDL2/src/video/SDL_pixels.c')
-rw-r--r--3rdparty/SDL2/src/video/SDL_pixels.c1127
1 files changed, 0 insertions, 1127 deletions
diff --git a/3rdparty/SDL2/src/video/SDL_pixels.c b/3rdparty/SDL2/src/video/SDL_pixels.c
deleted file mode 100644
index d905656cad7..00000000000
--- a/3rdparty/SDL2/src/video/SDL_pixels.c
+++ /dev/null
@@ -1,1127 +0,0 @@
-/*
- Simple DirectMedia Layer
- Copyright (C) 1997-2016 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_endian.h"
-#include "SDL_video.h"
-#include "SDL_sysvideo.h"
-#include "SDL_blit.h"
-#include "SDL_pixels_c.h"
-#include "SDL_RLEaccel_c.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
-};
-
-/* Helper functions */
-
-const char*
-SDL_GetPixelFormatName(Uint32 format)
-{
- switch (format) {
-#define CASE(X) case X: return #X;
- CASE(SDL_PIXELFORMAT_INDEX1LSB)
- CASE(SDL_PIXELFORMAT_INDEX1MSB)
- CASE(SDL_PIXELFORMAT_INDEX4LSB)
- CASE(SDL_PIXELFORMAT_INDEX4MSB)
- CASE(SDL_PIXELFORMAT_INDEX8)
- CASE(SDL_PIXELFORMAT_RGB332)
- CASE(SDL_PIXELFORMAT_RGB444)
- 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_RGB888)
- CASE(SDL_PIXELFORMAT_RGBX8888)
- CASE(SDL_PIXELFORMAT_BGR888)
- CASE(SDL_PIXELFORMAT_BGRX8888)
- CASE(SDL_PIXELFORMAT_ARGB8888)
- CASE(SDL_PIXELFORMAT_RGBA8888)
- CASE(SDL_PIXELFORMAT_ABGR8888)
- CASE(SDL_PIXELFORMAT_BGRA8888)
- CASE(SDL_PIXELFORMAT_ARGB2101010)
- 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)
-#undef CASE
- default:
- return "SDL_PIXELFORMAT_UNKNOWN";
- }
-}
-
-SDL_bool
-SDL_PixelFormatEnumToMasks(Uint32 format, int *bpp, Uint32 * Rmask,
- Uint32 * Gmask, Uint32 * Bmask, Uint32 * Amask)
-{
- Uint32 masks[4];
-
- /* This function doesn't work with FourCC pixel formats */
- if (SDL_ISPIXELFORMAT_FOURCC(format)) {
- SDL_SetError("FOURCC pixel formats are not supported");
- return SDL_FALSE;
- }
-
- /* 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;
-}
-
-Uint32
-SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask,
- Uint32 Amask)
-{
- switch (bpp) {
- case 1:
- /* SDL defaults to MSB ordering */
- return SDL_PIXELFORMAT_INDEX1MSB;
- case 4:
- /* SDL defaults to MSB ordering */
- return SDL_PIXELFORMAT_INDEX4MSB;
- case 8:
- if (Rmask == 0) {
- return SDL_PIXELFORMAT_INDEX8;
- }
- if (Rmask == 0xE0 &&
- Gmask == 0x1C &&
- Bmask == 0x03 &&
- Amask == 0x00) {
- return SDL_PIXELFORMAT_RGB332;
- }
- break;
- case 12:
- if (Rmask == 0) {
- return SDL_PIXELFORMAT_RGB444;
- }
- if (Rmask == 0x0F00 &&
- Gmask == 0x00F0 &&
- Bmask == 0x000F &&
- Amask == 0x0000) {
- return SDL_PIXELFORMAT_RGB444;
- }
- break;
- case 15:
- if (Rmask == 0) {
- return SDL_PIXELFORMAT_RGB555;
- }
- /* Fall through to 16-bit checks */
- 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;
- }
- 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
- }
- case 32:
- if (Rmask == 0) {
- return SDL_PIXELFORMAT_RGB888;
- }
- if (Rmask == 0x00FF0000 &&
- Gmask == 0x0000FF00 &&
- Bmask == 0x000000FF &&
- Amask == 0x00000000) {
- return SDL_PIXELFORMAT_RGB888;
- }
- 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_BGR888;
- }
- 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 == 0xC0000000) {
- return SDL_PIXELFORMAT_ARGB2101010;
- }
- }
- return SDL_PIXELFORMAT_UNKNOWN;
-}
-
-static SDL_PixelFormat *formats;
-
-SDL_PixelFormat *
-SDL_AllocFormat(Uint32 pixel_format)
-{
- SDL_PixelFormat *format;
-
- /* Look it up in our list of previously allocated formats */
- for (format = formats; format; format = format->next) {
- if (pixel_format == format->format) {
- ++format->refcount;
- return format;
- }
- }
-
- /* Allocate an empty pixel format structure, and initialize it */
- format = SDL_malloc(sizeof(*format));
- if (format == NULL) {
- SDL_OutOfMemory();
- return NULL;
- }
- if (SDL_InitFormat(format, pixel_format) < 0) {
- SDL_free(format);
- SDL_InvalidParamError("format");
- return NULL;
- }
-
- if (!SDL_ISPIXELFORMAT_INDEXED(pixel_format)) {
- /* Cache the RGB formats */
- format->next = formats;
- formats = format;
- }
- return format;
-}
-
-int
-SDL_InitFormat(SDL_PixelFormat * format, Uint32 pixel_format)
-{
- int bpp;
- Uint32 Rmask, Gmask, Bmask, Amask;
- Uint32 mask;
-
- if (!SDL_PixelFormatEnumToMasks(pixel_format, &bpp,
- &Rmask, &Gmask, &Bmask, &Amask)) {
- return -1;
- }
-
- /* Set up the format */
- SDL_zerop(format);
- format->format = pixel_format;
- format->BitsPerPixel = bpp;
- format->BytesPerPixel = (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); 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); 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); 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); mask >>= 1)
- --format->Aloss;
- }
-
- format->palette = NULL;
- format->refcount = 1;
- format->next = NULL;
-
- return 0;
-}
-
-void
-SDL_FreeFormat(SDL_PixelFormat *format)
-{
- SDL_PixelFormat *prev;
-
- if (!format) {
- SDL_InvalidParamError("format");
- return;
- }
- if (--format->refcount > 0) {
- 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;
- }
- }
- }
-
- if (format->palette) {
- SDL_FreePalette(format->palette);
- }
- SDL_free(format);
-}
-
-SDL_Palette *
-SDL_AllocPalette(int ncolors)
-{
- SDL_Palette *palette;
-
- /* Input validation */
- if (ncolors < 1) {
- SDL_InvalidParamError("ncolors");
- return NULL;
- }
-
- palette = (SDL_Palette *) SDL_malloc(sizeof(*palette));
- if (!palette) {
- SDL_OutOfMemory();
- 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_SetError("SDL_SetPixelFormatPalette() passed NULL format");
- }
-
- if (palette && palette->ncolors != (1 << format->BitsPerPixel)) {
- return SDL_SetError("SDL_SetPixelFormatPalette() passed a palette that doesn't match the format");
- }
-
- if (format->palette == palette) {
- return 0;
- }
-
- if (format->palette) {
- SDL_FreePalette(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_FreePalette(SDL_Palette * palette)
-{
- if (!palette) {
- SDL_InvalidParamError("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 = r;
- g = (i << 3) & 0xe0;
- g |= g >> 3 | g >> 6;
- colors[i].g = g;
- b = i & 0x3;
- b |= b << 2;
- b |= b << 4;
- colors[i].b = b;
- colors[i].a = SDL_ALPHA_OPAQUE;
- }
-}
-
-/*
- * Calculate the pad-aligned scanline width of a surface
- */
-int
-SDL_CalculatePitch(SDL_Surface * surface)
-{
- int pitch;
-
- /* Surface should be 4-byte aligned for speed */
- pitch = surface->w * surface->format->BytesPerPixel;
- switch (surface->format->BitsPerPixel) {
- case 1:
- pitch = (pitch + 7) / 8;
- break;
- case 4:
- pitch = (pitch + 1) / 2;
- break;
- default:
- break;
- }
- pitch = (pitch + 3) & ~3; /* 4-byte aligning */
- return (pitch);
-}
-
-/*
- * 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 = ~0;
- 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 = i;
- if (distance == 0) { /* Perfect match! */
- break;
- }
- smallest = distance;
- }
- }
- return (pixel);
-}
-
-/* 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->palette == NULL) {
- return (r >> format->Rloss) << format->Rshift
- | (g >> format->Gloss) << format->Gshift
- | (b >> format->Bloss) << format->Bshift | format->Amask;
- } else {
- return SDL_FindColor(format->palette, r, g, b, SDL_ALPHA_OPAQUE);
- }
-}
-
-/* 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->palette == NULL) {
- return (r >> format->Rloss) << format->Rshift
- | (g >> format->Gloss) << format->Gshift
- | (b >> format->Bloss) << format->Bshift
- | ((a >> format->Aloss) << format->Ashift & format->Amask);
- } else {
- return SDL_FindColor(format->palette, r, g, b, a);
- }
-}
-
-void
-SDL_GetRGB(Uint32 pixel, const SDL_PixelFormat * format, Uint8 * r, Uint8 * g,
- Uint8 * b)
-{
- if (format->palette == NULL) {
- 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];
- } else {
- 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;
- }
- }
-}
-
-void
-SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat * format,
- Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a)
-{
- if (format->palette == NULL) {
- 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];
- } else {
- 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;
- }
- }
-}
-
-/* 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_malloc(src->ncolors);
- if (map == NULL) {
- SDL_OutOfMemory();
- 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->BytesPerPixel == 3) ? 4 : dst->BytesPerPixel);
- map = (Uint8 *) SDL_malloc(pal->ncolors * bpp);
- if (map == NULL) {
- SDL_OutOfMemory();
- 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->BytesPerPixel, dst, R, G, B, 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 == NULL) {
- SDL_OutOfMemory();
- 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_InvalidateMap(SDL_BlitMap * map)
-{
- if (!map) {
- return;
- }
- if (map->dst) {
- /* Release our reference to the surface - see the note below */
- if (--map->dst->refcount <= 0) {
- SDL_FreeSurface(map->dst);
- }
- }
- 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 ((src->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
- SDL_UnRLESurface(src, 1);
- }
- 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 == NULL) {
- return (-1);
- }
- }
- if (srcfmt->BitsPerPixel != dstfmt->BitsPerPixel)
- 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 == NULL) {
- 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 == NULL) {
- 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) {
- /* Keep a reference to this surface so it doesn't get deleted
- while we're still pointing at it.
-
- A better method would be for the destination surface to keep
- track of surfaces that are mapped to it and automatically
- invalidate them when it is freed, but this will do for now.
- */
- ++map->dst->refcount;
- }
-
- 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);
- }
-}
-
-void
-SDL_CalculateGammaRamp(float gamma, Uint16 * ramp)
-{
- int i;
-
- /* Input validation */
- if (gamma < 0.0f ) {
- SDL_InvalidParamError("gamma");
- return;
- }
- if (ramp == NULL) {
- SDL_InvalidParamError("ramp");
- return;
- }
-
- /* 0.0 gamma is all black */
- if (gamma == 0.0f) {
- SDL_memset(ramp, 0, 256 * sizeof(Uint16));
- return;
- } else if (gamma == 1.0f) {
- /* 1.0 gamma is identity */
- for (i = 0; i < 256; ++i) {
- ramp[i] = (i << 8) | i;
- }
- return;
- } else {
- /* Calculate a real gamma ramp */
- int value;
- gamma = 1.0f / gamma;
- for (i = 0; i < 256; ++i) {
- value =
- (int) (SDL_pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
- if (value > 65535) {
- value = 65535;
- }
- ramp[i] = (Uint16) value;
- }
- }
-}
-
-/* vi: set ts=4 sw=4 expandtab: */