| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2006 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.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" |
| |
| /* Helper functions */ |
| |
| SDL_bool |
| SDL_PixelFormatEnumToMasks(Uint32 format, int *bpp, Uint32 * Rmask, |
| Uint32 * Gmask, Uint32 * Bmask, Uint32 * Amask) |
| { |
| Uint32 masks[4]; |
| |
| /* Initialize the values here */ |
| if (SDL_BITSPERPIXEL(format) == 24) { |
| *bpp = SDL_BYTESPERPIXEL(format) * 8; |
| } else { |
| *bpp = SDL_BITSPERPIXEL(format); |
| } |
| *Rmask = *Gmask = *Bmask = *Amask = 0; |
| |
| 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_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; |
| default: |
| /* Unknown layout */ |
| 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: |
| /* Unknown order */ |
| return SDL_FALSE; |
| } |
| return SDL_TRUE; |
| } |
| |
| Uint32 |
| SDL_MasksToPixelFormatEnum(int bpp, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, |
| Uint32 Amask) |
| { |
| switch (bpp) { |
| case 8: |
| switch (Rmask) { |
| case 0: |
| return SDL_PIXELFORMAT_INDEX8; |
| case 0xE0: |
| return SDL_PIXELFORMAT_RGB332; |
| } |
| break; |
| case 12: |
| switch (Rmask) { |
| case 0x0F00: |
| return SDL_PIXELFORMAT_RGB444; |
| } |
| break; |
| case 15: |
| switch (Rmask) { |
| case 0x7C00: |
| return SDL_PIXELFORMAT_RGB555; |
| } |
| break; |
| case 16: |
| switch (Rmask) { |
| case 0x0F00: |
| return SDL_PIXELFORMAT_ARGB4444; |
| case 0x7C00: |
| return SDL_PIXELFORMAT_ARGB1555; |
| case 0xF800: |
| return SDL_PIXELFORMAT_RGB565; |
| } |
| break; |
| case 32: |
| switch (Rmask) { |
| case 0xFF000000: |
| if (Amask == 0x000000FF) { |
| return SDL_PIXELFORMAT_RGBA8888; |
| } |
| break; |
| case 0x00FF0000: |
| if (Amask == 0xFF000000) { |
| return SDL_PIXELFORMAT_ARGB8888; |
| } else { |
| return SDL_PIXELFORMAT_RGB888; |
| } |
| break; |
| case 0x0000FF00: |
| if (Amask == 0x000000FF) { |
| return SDL_PIXELFORMAT_BGRA8888; |
| } |
| break; |
| case 0x000000FF: |
| if (Amask == 0xFF000000) { |
| return SDL_PIXELFORMAT_ABGR8888; |
| } else { |
| return SDL_PIXELFORMAT_BGR888; |
| } |
| break; |
| case 0x3FF00000: |
| return SDL_PIXELFORMAT_ARGB2101010; |
| } |
| } |
| return SDL_PIXELFORMAT_UNKNOWN; |
| } |
| |
| |
| SDL_Palette * |
| SDL_AllocPalette(int ncolors) |
| { |
| SDL_Palette *palette; |
| |
| 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->watch = NULL; |
| palette->refcount = 1; |
| |
| SDL_memset(palette->colors, 0xFF, ncolors * sizeof(*palette->colors)); |
| |
| return palette; |
| } |
| |
| int |
| SDL_AddPaletteWatch(SDL_Palette * palette, SDL_PaletteChangedFunc callback, |
| void *userdata) |
| { |
| SDL_PaletteWatch *watch; |
| |
| if (!palette) { |
| return -1; |
| } |
| |
| watch = (SDL_PaletteWatch *) SDL_malloc(sizeof(*watch)); |
| if (!watch) { |
| SDL_OutOfMemory(); |
| return -1; |
| } |
| |
| watch->callback = callback; |
| watch->userdata = userdata; |
| watch->next = palette->watch; |
| palette->watch = watch; |
| ++palette->refcount; |
| return 0; |
| } |
| |
| void |
| SDL_DelPaletteWatch(SDL_Palette * palette, SDL_PaletteChangedFunc callback, |
| void *userdata) |
| { |
| SDL_PaletteWatch *prev, *watch; |
| |
| if (!palette) { |
| return; |
| } |
| |
| for (prev = NULL, watch = palette->watch; watch; |
| prev = watch, watch = watch->next) { |
| if (watch->callback == callback && watch->userdata == userdata) { |
| if (prev) { |
| prev->next = watch->next; |
| } else { |
| palette->watch = watch->next; |
| } |
| SDL_free(watch); |
| SDL_FreePalette(palette); |
| return; |
| } |
| } |
| } |
| |
| int |
| SDL_SetPaletteColors(SDL_Palette * palette, const SDL_Color * colors, |
| int firstcolor, int ncolors) |
| { |
| SDL_PaletteWatch *watch; |
| 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)); |
| } |
| |
| for (watch = palette->watch; watch; watch = watch->next) { |
| if (watch->callback(watch->userdata, palette) < 0) { |
| status = -1; |
| } |
| } |
| |
| return status; |
| } |
| |
| void |
| SDL_FreePalette(SDL_Palette * palette) |
| { |
| if (!palette) { |
| return; |
| } |
| if (--palette->refcount > 0) { |
| return; |
| } |
| if (palette->colors) { |
| SDL_free(palette->colors); |
| } |
| SDL_free(palette); |
| } |
| |
| /* |
| * Allocate a pixel format structure and fill it according to the given info. |
| */ |
| SDL_PixelFormat * |
| SDL_AllocFormat(int bpp, |
| Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) |
| { |
| SDL_PixelFormat *format; |
| Uint32 mask; |
| |
| /* Allocate an empty pixel format structure */ |
| format = SDL_calloc(1, sizeof(*format)); |
| if (format == NULL) { |
| SDL_OutOfMemory(); |
| return (NULL); |
| } |
| format->alpha = SDL_ALPHA_OPAQUE; |
| |
| /* Set up the format */ |
| format->BitsPerPixel = bpp; |
| format->BytesPerPixel = (bpp + 7) / 8; |
| if (Rmask || Bmask || Gmask) { /* Packed pixels with custom mask */ |
| 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->Gshift = 0; |
| format->Gloss = 8; |
| if (Gmask) { |
| for (mask = Gmask; !(mask & 0x01); mask >>= 1) |
| ++format->Gshift; |
| for (; (mask & 0x01); mask >>= 1) |
| --format->Gloss; |
| } |
| 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->Ashift = 0; |
| format->Aloss = 8; |
| if (Amask) { |
| for (mask = Amask; !(mask & 0x01); mask >>= 1) |
| ++format->Ashift; |
| for (; (mask & 0x01); mask >>= 1) |
| --format->Aloss; |
| } |
| format->Rmask = Rmask; |
| format->Gmask = Gmask; |
| format->Bmask = Bmask; |
| format->Amask = Amask; |
| } else if (bpp > 8) { /* Packed pixels with standard mask */ |
| /* R-G-B */ |
| if (bpp > 24) |
| bpp = 24; |
| format->Rloss = 8 - (bpp / 3); |
| format->Gloss = 8 - (bpp / 3) - (bpp % 3); |
| format->Bloss = 8 - (bpp / 3); |
| format->Rshift = ((bpp / 3) + (bpp % 3)) + (bpp / 3); |
| format->Gshift = (bpp / 3); |
| format->Bshift = 0; |
| format->Rmask = ((0xFF >> format->Rloss) << format->Rshift); |
| format->Gmask = ((0xFF >> format->Gloss) << format->Gshift); |
| format->Bmask = ((0xFF >> format->Bloss) << format->Bshift); |
| } else { |
| /* Palettized formats have no mask info */ |
| format->Rloss = 8; |
| format->Gloss = 8; |
| format->Bloss = 8; |
| format->Aloss = 8; |
| format->Rshift = 0; |
| format->Gshift = 0; |
| format->Bshift = 0; |
| format->Ashift = 0; |
| format->Rmask = 0; |
| format->Gmask = 0; |
| format->Bmask = 0; |
| format->Amask = 0; |
| } |
| format->palette = NULL; |
| |
| return (format); |
| } |
| |
| /* |
| * Change any previous mappings from/to the new surface format |
| */ |
| void |
| SDL_FormatChanged(SDL_Surface * surface) |
| { |
| static int format_version = 0; |
| ++format_version; |
| if (format_version < 0) { /* It wrapped... */ |
| format_version = 1; |
| } |
| surface->format_version = format_version; |
| SDL_InvalidateMap(surface->map); |
| } |
| |
| /* |
| * Free a previously allocated format structure |
| */ |
| void |
| SDL_FreeFormat(SDL_PixelFormat * format) |
| { |
| if (!format) { |
| return; |
| } |
| SDL_free(format); |
| } |
| |
| /* |
| * 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].unused = 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) |
| { |
| /* Do colorspace distance matching */ |
| unsigned int smallest; |
| unsigned int distance; |
| int rd, gd, bd; |
| 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; |
| distance = (rd * rd) + (gd * gd) + (bd * bd); |
| 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(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); |
| } |
| } |
| |
| /* Find the pixel value corresponding to an RGBA quadruple */ |
| Uint32 |
| SDL_MapRGBA(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); |
| } |
| } |
| |
| void |
| SDL_GetRGBA(Uint32 pixel, SDL_PixelFormat * fmt, |
| Uint8 * r, Uint8 * g, Uint8 * b, Uint8 * a) |
| { |
| if (fmt->palette == NULL) { |
| /* |
| * This makes sure that the result is mapped to the |
| * interval [0..255], and the maximum value for each |
| * component is 255. This is important to make sure |
| * that white is indeed reported as (255, 255, 255), |
| * and that opaque alpha is 255. |
| * This only works for RGB bit fields at least 4 bit |
| * wide, which is almost always the case. |
| */ |
| unsigned v; |
| v = (pixel & fmt->Rmask) >> fmt->Rshift; |
| *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
| v = (pixel & fmt->Gmask) >> fmt->Gshift; |
| *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
| v = (pixel & fmt->Bmask) >> fmt->Bshift; |
| *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| if (fmt->Amask) { |
| v = (pixel & fmt->Amask) >> fmt->Ashift; |
| *a = (v << fmt->Aloss) + (v >> (8 - (fmt->Aloss << 1))); |
| } else { |
| *a = SDL_ALPHA_OPAQUE; |
| } |
| } else { |
| *r = fmt->palette->colors[pixel].r; |
| *g = fmt->palette->colors[pixel].g; |
| *b = fmt->palette->colors[pixel].b; |
| *a = SDL_ALPHA_OPAQUE; |
| } |
| } |
| |
| void |
| SDL_GetRGB(Uint32 pixel, SDL_PixelFormat * fmt, Uint8 * r, Uint8 * g, |
| Uint8 * b) |
| { |
| if (fmt->palette == NULL) { |
| /* the note for SDL_GetRGBA above applies here too */ |
| unsigned v; |
| v = (pixel & fmt->Rmask) >> fmt->Rshift; |
| *r = (v << fmt->Rloss) + (v >> (8 - (fmt->Rloss << 1))); |
| v = (pixel & fmt->Gmask) >> fmt->Gshift; |
| *g = (v << fmt->Gloss) + (v >> (8 - (fmt->Gloss << 1))); |
| v = (pixel & fmt->Bmask) >> fmt->Bshift; |
| *b = (v << fmt->Bloss) + (v >> (8 - (fmt->Bloss << 1))); |
| } else { |
| *r = fmt->palette->colors[pixel].r; |
| *g = fmt->palette->colors[pixel].g; |
| *b = fmt->palette->colors[pixel].b; |
| } |
| } |
| |
| /* Apply gamma to a set of colors - this is easy. :) */ |
| void |
| SDL_ApplyGamma(Uint16 * gamma, SDL_Color * colors, SDL_Color * output, |
| int ncolors) |
| { |
| int i; |
| |
| for (i = 0; i < ncolors; ++i) { |
| output[i].r = gamma[0 * 256 + colors[i].r] >> 8; |
| output[i].g = gamma[1 * 256 + colors[i].g] >> 8; |
| output[i].b = gamma[2 * 256 + colors[i].b] >> 8; |
| } |
| } |
| |
| /* 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); |
| } |
| return (map); |
| } |
| |
| /* Map from Palette to BitField */ |
| static Uint8 * |
| Map1toN(SDL_PixelFormat * src, SDL_PixelFormat * dst) |
| { |
| Uint8 *map; |
| int i; |
| int bpp; |
| unsigned alpha; |
| 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); |
| } |
| |
| alpha = dst->Amask ? src->alpha : 0; |
| /* We memory copy to the pixel map so the endianness is preserved */ |
| for (i = 0; i < pal->ncolors; ++i) { |
| ASSEMBLE_RGBA(&map[i * bpp], dst->BytesPerPixel, dst, |
| pal->colors[i].r, pal->colors[i].g, |
| pal->colors[i].b, alpha); |
| } |
| 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); |
| } |
| |
| /* Allocate the software blit data */ |
| map->sw_data = |
| (struct private_swaccel *) SDL_calloc(1, sizeof(*map->sw_data)); |
| if (map->sw_data == NULL) { |
| SDL_FreeBlitMap(map); |
| SDL_OutOfMemory(); |
| return (NULL); |
| } |
| |
| /* It's ready to go */ |
| return (map); |
| } |
| |
| void |
| SDL_InvalidateMap(SDL_BlitMap * map) |
| { |
| if (!map) { |
| return; |
| } |
| map->dst = NULL; |
| map->format_version = (unsigned int) -1; |
| if (map->table) { |
| SDL_free(map->table); |
| map->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; |
| switch (srcfmt->BytesPerPixel) { |
| case 1: |
| switch (dstfmt->BytesPerPixel) { |
| case 1: |
| /* Palette --> Palette */ |
| map->table = |
| Map1to1(srcfmt->palette, dstfmt->palette, &map->identity); |
| if (!map->identity) { |
| if (map->table == NULL) { |
| return (-1); |
| } |
| } |
| if (srcfmt->BitsPerPixel != dstfmt->BitsPerPixel) |
| map->identity = 0; |
| break; |
| |
| default: |
| /* Palette --> BitField */ |
| map->table = Map1toN(srcfmt, dstfmt); |
| if (map->table == NULL) { |
| return (-1); |
| } |
| break; |
| } |
| break; |
| default: |
| switch (dstfmt->BytesPerPixel) { |
| case 1: |
| /* BitField --> Palette */ |
| map->table = MapNto1(srcfmt, dstfmt, &map->identity); |
| if (!map->identity) { |
| if (map->table == NULL) { |
| return (-1); |
| } |
| } |
| map->identity = 0; /* Don't optimize to copy */ |
| break; |
| default: |
| /* BitField --> BitField */ |
| if (FORMAT_EQUAL(srcfmt, dstfmt)) |
| map->identity = 1; |
| break; |
| } |
| break; |
| } |
| |
| map->dst = dst; |
| map->format_version = dst->format_version; |
| |
| /* Choose your blitters wisely */ |
| return (SDL_CalculateBlit(src)); |
| } |
| |
| void |
| SDL_FreeBlitMap(SDL_BlitMap * map) |
| { |
| if (map) { |
| SDL_InvalidateMap(map); |
| if (map->sw_data != NULL) { |
| SDL_free(map->sw_data); |
| } |
| SDL_free(map); |
| } |
| } |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
