Mercurial > sdl-ios-xcode
diff src/video/SDL_pixels.c @ 1895:c121d94672cb
SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Mon, 10 Jul 2006 21:04:37 +0000 |
parents | 61c237f69076 |
children | 8a162bfdc838 |
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line diff
--- a/src/video/SDL_pixels.c Thu Jul 06 18:01:37 2006 +0000 +++ b/src/video/SDL_pixels.c Mon Jul 10 21:04:37 2006 +0000 @@ -31,591 +31,804 @@ #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 * +SDL_AllocFormat(int bpp, + Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) { - SDL_PixelFormat *format; - Uint32 mask; + SDL_PixelFormat *format; + Uint32 mask; - /* Allocate an empty pixel format structure */ - format = SDL_malloc(sizeof(*format)); - if ( format == NULL ) { - SDL_OutOfMemory(); - return(NULL); - } - SDL_memset(format, 0, sizeof(*format)); - format->alpha = SDL_ALPHA_OPAQUE; + /* Allocate an empty pixel format structure */ + format = SDL_malloc(sizeof(*format)); + if (format == NULL) { + SDL_OutOfMemory(); + return (NULL); + } + SDL_memset(format, 0, sizeof(*format)); + 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->palette = NULL; - 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; - } - if ( bpp <= 8 ) { /* Palettized mode */ - int ncolors = 1<<bpp; -#ifdef DEBUG_PALETTE - fprintf(stderr,"bpp=%d ncolors=%d\n",bpp,ncolors); -#endif - format->palette = (SDL_Palette *)SDL_malloc(sizeof(SDL_Palette)); - if ( format->palette == NULL ) { - SDL_FreeFormat(format); - SDL_OutOfMemory(); - return(NULL); - } - (format->palette)->ncolors = ncolors; - (format->palette)->colors = (SDL_Color *)SDL_malloc( - (format->palette)->ncolors*sizeof(SDL_Color)); - if ( (format->palette)->colors == NULL ) { - SDL_FreeFormat(format); - SDL_OutOfMemory(); - return(NULL); - } - if ( Rmask || Bmask || Gmask ) { - /* create palette according to masks */ - int i; - int Rm=0,Gm=0,Bm=0; - int Rw=0,Gw=0,Bw=0; -#ifdef ENABLE_PALETTE_ALPHA - int Am=0,Aw=0; -#endif - if(Rmask) - { - Rw=8-format->Rloss; - for(i=format->Rloss;i>0;i-=Rw) - Rm|=1<<i; - } -#ifdef DEBUG_PALETTE - fprintf(stderr,"Rw=%d Rm=0x%02X\n",Rw,Rm); -#endif - if(Gmask) - { - Gw=8-format->Gloss; - for(i=format->Gloss;i>0;i-=Gw) - Gm|=1<<i; - } -#ifdef DEBUG_PALETTE - fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm); -#endif - if(Bmask) - { - Bw=8-format->Bloss; - for(i=format->Bloss;i>0;i-=Bw) - Bm|=1<<i; - } -#ifdef DEBUG_PALETTE - fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm); -#endif -#ifdef ENABLE_PALETTE_ALPHA - if(Amask) - { - Aw=8-format->Aloss; - for(i=format->Aloss;i>0;i-=Aw) - Am|=1<<i; - } -# ifdef DEBUG_PALETTE - fprintf(stderr,"Aw=%d Am=0x%02X\n",Aw,Am); -# endif -#endif - for(i=0; i < ncolors; ++i) { - int r,g,b; - r=(i&Rmask)>>format->Rshift; - r=(r<<format->Rloss)|((r*Rm)>>Rw); - format->palette->colors[i].r=r; + /* 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; - g=(i&Gmask)>>format->Gshift; - g=(g<<format->Gloss)|((g*Gm)>>Gw); - format->palette->colors[i].g=g; - - b=(i&Bmask)>>format->Bshift; - b=(b<<format->Bloss)|((b*Bm)>>Bw); - format->palette->colors[i].b=b; - -#ifdef ENABLE_PALETTE_ALPHA - a=(i&Amask)>>format->Ashift; - a=(a<<format->Aloss)|((a*Am)>>Aw); - format->palette->colors[i].unused=a; -#else - format->palette->colors[i].unused=0; -#endif - } - } else if ( ncolors == 2 ) { - /* Create a black and white bitmap palette */ - format->palette->colors[0].r = 0xFF; - format->palette->colors[0].g = 0xFF; - format->palette->colors[0].b = 0xFF; - format->palette->colors[1].r = 0x00; - format->palette->colors[1].g = 0x00; - format->palette->colors[1].b = 0x00; - } else { - /* Create an empty palette */ - SDL_memset((format->palette)->colors, 0, - (format->palette)->ncolors*sizeof(SDL_Color)); - } - } - return(format); -} -SDL_PixelFormat *SDL_ReallocFormat(SDL_Surface *surface, int bpp, - Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) -{ - if ( surface->format ) { - SDL_FreeFormat(surface->format); - SDL_FormatChanged(surface); - } - surface->format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask); - return surface->format; + return (format); } /* * Change any previous mappings from/to the new surface format */ -void SDL_FormatChanged(SDL_Surface *surface) +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); + 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) +void +SDL_FreeFormat(SDL_PixelFormat * format) { - if ( format ) { - if ( format->palette ) { - if ( format->palette->colors ) { - SDL_free(format->palette->colors); - } - SDL_free(format->palette); - } - SDL_free(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) +void +SDL_DitherColors(SDL_Color * colors, int bpp) { - int i; - if(bpp != 8) - return; /* only 8bpp supported right now */ + 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; - } + 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 */ -Uint16 SDL_CalculatePitch(SDL_Surface *surface) +int +SDL_CalculatePitch(SDL_Surface * surface) { - Uint16 pitch; + 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); + /* 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 +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); + /* 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) +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); - } + 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) +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); - } + 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) +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; - } + 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) +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; - } + 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) +void +SDL_ApplyGamma(Uint16 * gamma, SDL_Color * colors, SDL_Color * output, + int ncolors) { - int i; + 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; - } + 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) +static Uint8 * +Map1to1(SDL_Palette * src, SDL_Palette * dst, int *identical) { - Uint8 *map; - int i; + Uint8 *map; + int i; - if ( identical ) { - if ( src->ncolors <= dst->ncolors ) { - /* If an identical palette, no need to map */ - if ( 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); + 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) +static Uint8 * +Map1toN(SDL_PixelFormat * src, SDL_PixelFormat * dst) { - Uint8 *map; - int i; - int bpp; - unsigned alpha; - SDL_Palette *pal = src->palette; + 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); - } + 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); + 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) +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; - - /* SDL_DitherColors does not initialize the 'unused' component of colors, - but Map1to1 compares it against pal, so we should initialize it. */ - SDL_memset(colors, 0, sizeof(colors)); + /* 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)); + dithered.ncolors = 256; + SDL_DitherColors(colors, 8); + dithered.colors = colors; + return (Map1to1(&dithered, pal, identical)); } -SDL_BlitMap *SDL_AllocBlitMap(void) +SDL_BlitMap * +SDL_AllocBlitMap(void) { - SDL_BlitMap *map; + SDL_BlitMap *map; - /* Allocate the empty map */ - map = (SDL_BlitMap *)SDL_malloc(sizeof(*map)); - if ( map == NULL ) { - SDL_OutOfMemory(); - return(NULL); - } - SDL_memset(map, 0, sizeof(*map)); + /* Allocate the empty map */ + map = (SDL_BlitMap *) SDL_malloc(sizeof(*map)); + if (map == NULL) { + SDL_OutOfMemory(); + return (NULL); + } + SDL_memset(map, 0, sizeof(*map)); - /* Allocate the software blit data */ - map->sw_data = (struct private_swaccel *)SDL_malloc(sizeof(*map->sw_data)); - if ( map->sw_data == NULL ) { - SDL_FreeBlitMap(map); - SDL_OutOfMemory(); - return(NULL); - } - SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); + /* Allocate the software blit data */ + map->sw_data = + (struct private_swaccel *) SDL_malloc(sizeof(*map->sw_data)); + if (map->sw_data == NULL) { + SDL_FreeBlitMap(map); + SDL_OutOfMemory(); + return (NULL); + } + SDL_memset(map->sw_data, 0, sizeof(*map->sw_data)); - /* It's ready to go */ - return(map); + /* It's ready to go */ + return (map); } -void SDL_InvalidateMap(SDL_BlitMap *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; - } + 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) +int +SDL_MapSurface(SDL_Surface * src, SDL_Surface * dst) { - SDL_PixelFormat *srcfmt; - SDL_PixelFormat *dstfmt; - SDL_BlitMap *map; + 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); + /* 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 */ - /* If both SDL_HWSURFACE, assume have same palette */ - if ( ((src->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && - ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) ) { - map->identity = 1; - } else { - 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; + /* 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; - } + 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; + map->dst = dst; + map->format_version = dst->format_version; - /* Choose your blitters wisely */ - return(SDL_CalculateBlit(src)); + /* Choose your blitters wisely */ + return (SDL_CalculateBlit(src)); } -void SDL_FreeBlitMap(SDL_BlitMap *map) + +void +SDL_FreeBlitMap(SDL_BlitMap * map) { - if ( map ) { - SDL_InvalidateMap(map); - if ( map->sw_data != NULL ) { - SDL_free(map->sw_data); - } - SDL_free(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: */