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diff src/video/SDL_pixels.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 61c237f69076
children 4da1ee79c9af
line wrap: on
line diff
--- a/src/video/SDL_pixels.c	Sun May 21 17:27:13 2006 +0000
+++ b/src/video/SDL_pixels.c	Sun May 28 13:04:16 2006 +0000
@@ -31,591 +31,806 @@
 #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;
+}
+
 /*
  * 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;
+    /* 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;
+        fprintf (stderr, "bpp=%d ncolors=%d\n", bpp, ncolors);
 #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);
+        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(Gmask)
-			{
-				Gw=8-format->Gloss;
-				for(i=format->Gloss;i>0;i-=Gw)
-					Gm|=1<<i;
-			}
+            if (Rmask) {
+                Rw = 8 - format->Rloss;
+                for (i = format->Rloss; i > 0; i -= Rw)
+                    Rm |= 1 << i;
+            }
 #ifdef DEBUG_PALETTE
-			fprintf(stderr,"Gw=%d Gm=0x%02X\n",Gw,Gm);
+            fprintf (stderr, "Rw=%d Rm=0x%02X\n", Rw, Rm);
 #endif
-			if(Bmask)
-			{
-				Bw=8-format->Bloss;
-				for(i=format->Bloss;i>0;i-=Bw)
-					Bm|=1<<i;
-			}
+            if (Gmask) {
+                Gw = 8 - format->Gloss;
+                for (i = format->Gloss; i > 0; i -= Gw)
+                    Gm |= 1 << i;
+            }
 #ifdef DEBUG_PALETTE
-			fprintf(stderr,"Bw=%d Bm=0x%02X\n",Bw,Bm);
+            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;
-			}
+            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);
+            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;
+            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;
 
-				g=(i&Gmask)>>format->Gshift;
-				g=(g<<format->Gloss)|((g*Gm)>>Gw);
-				format->palette->colors[i].g=g;
+                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;
+                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;
+                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;
+                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);
+            }
+        } 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)
+
+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;
+    if (surface->format) {
+        SDL_FreeFormat (surface->format);
+        SDL_FormatChanged (surface);
+    }
+    surface->format = SDL_AllocFormat (bpp, Rmask, Gmask, Bmask, Amask);
+    return surface->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) {
+        if (format->palette) {
+            if (format->palette->colors) {
+                SDL_free (format->palette->colors);
+            }
+            SDL_free (format->palette);
+        }
+        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;
+    }
 }
+
 /* 
  * Calculate the pad-aligned scanline width of a surface
  */
-Uint16 SDL_CalculatePitch(SDL_Surface *surface)
+Uint16
+SDL_CalculatePitch (SDL_Surface * surface)
 {
-	Uint16 pitch;
+    Uint16 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 (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);
+}
+
+/* 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;
 
-	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);
+    /* 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));
+
+    dithered.ncolors = 256;
+    SDL_DitherColors (colors, 8);
+    dithered.colors = colors;
+    return (Map1to1 (&dithered, pal, identical));
 }
-/* Map from BitField to Dithered-Palette to Palette */
-static Uint8 *MapNto1(SDL_PixelFormat *src, SDL_PixelFormat *dst, int *identical)
+
+SDL_BlitMap *
+SDL_AllocBlitMap (void)
 {
-	/* 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));
+    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));
 
-	dithered.ncolors = 256;
-	SDL_DitherColors(colors, 8);
-	dithered.colors = colors;
-	return(Map1to1(&dithered, pal, identical));
+    /* 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);
 }
 
-SDL_BlitMap *SDL_AllocBlitMap(void)
+void
+SDL_InvalidateMap (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 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);
+    if (!map) {
+        return;
+    }
+    map->dst = NULL;
+    map->format_version = (unsigned int) -1;
+    if (map->table) {
+        SDL_free (map->table);
+        map->table = NULL;
+    }
 }
-void SDL_InvalidateMap(SDL_BlitMap *map)
+int
+SDL_MapSurface (SDL_Surface * src, SDL_Surface * dst)
 {
-	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;
+    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 */
+            /* 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;
 
-		    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: */