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diff src/video/SDL_blit.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 e49147870aac
children 4da1ee79c9af
line wrap: on
line diff
--- a/src/video/SDL_blit.c	Sun May 21 17:27:13 2006 +0000
+++ b/src/video/SDL_blit.c	Sun May 28 13:04:16 2006 +0000
@@ -37,316 +37,308 @@
 #endif
 
 /* The general purpose software blit routine */
-static int SDL_SoftBlit(SDL_Surface *src, SDL_Rect *srcrect,
-			SDL_Surface *dst, SDL_Rect *dstrect)
+static int
+SDL_SoftBlit (SDL_Surface * src, SDL_Rect * srcrect,
+              SDL_Surface * dst, SDL_Rect * dstrect)
 {
-	int okay;
-	int src_locked;
-	int dst_locked;
+    int okay;
+    int src_locked;
+    int dst_locked;
 
-	/* Everything is okay at the beginning...  */
-	okay = 1;
+    /* Everything is okay at the beginning...  */
+    okay = 1;
 
-	/* Lock the destination if it's in hardware */
-	dst_locked = 0;
-	if ( SDL_MUSTLOCK(dst) ) {
-		if ( SDL_LockSurface(dst) < 0 ) {
-			okay = 0;
-		} else {
-			dst_locked = 1;
-		}
-	}
-	/* Lock the source if it's in hardware */
-	src_locked = 0;
-	if ( SDL_MUSTLOCK(src) ) {
-		if ( SDL_LockSurface(src) < 0 ) {
-			okay = 0;
-		} else {
-			src_locked = 1;
-		}
-	}
+    /* Lock the destination if it's in hardware */
+    dst_locked = 0;
+    if (SDL_MUSTLOCK (dst)) {
+        if (SDL_LockSurface (dst) < 0) {
+            okay = 0;
+        } else {
+            dst_locked = 1;
+        }
+    }
+    /* Lock the source if it's in hardware */
+    src_locked = 0;
+    if (SDL_MUSTLOCK (src)) {
+        if (SDL_LockSurface (src) < 0) {
+            okay = 0;
+        } else {
+            src_locked = 1;
+        }
+    }
 
-	/* Set up source and destination buffer pointers, and BLIT! */
-	if ( okay  && srcrect->w && srcrect->h ) {
-		SDL_BlitInfo info;
-		SDL_loblit RunBlit;
+    /* Set up source and destination buffer pointers, and BLIT! */
+    if (okay && srcrect->w && srcrect->h) {
+        SDL_BlitInfo info;
+        SDL_loblit RunBlit;
 
-		/* Set up the blit information */
-		info.s_pixels = (Uint8 *)src->pixels +
-				(Uint16)srcrect->y*src->pitch +
-				(Uint16)srcrect->x*src->format->BytesPerPixel;
-		info.s_width = srcrect->w;
-		info.s_height = srcrect->h;
-		info.s_skip=src->pitch-info.s_width*src->format->BytesPerPixel;
-		info.d_pixels = (Uint8 *)dst->pixels +
-				(Uint16)dstrect->y*dst->pitch +
-				(Uint16)dstrect->x*dst->format->BytesPerPixel;
-		info.d_width = dstrect->w;
-		info.d_height = dstrect->h;
-		info.d_skip=dst->pitch-info.d_width*dst->format->BytesPerPixel;
-		info.aux_data = src->map->sw_data->aux_data;
-		info.src = src->format;
-		info.table = src->map->table;
-		info.dst = dst->format;
-		RunBlit = src->map->sw_data->blit;
+        /* Set up the blit information */
+        info.s_pixels = (Uint8 *) src->pixels +
+            (Uint16) srcrect->y * src->pitch +
+            (Uint16) srcrect->x * src->format->BytesPerPixel;
+        info.s_width = srcrect->w;
+        info.s_height = srcrect->h;
+        info.s_skip = src->pitch - info.s_width * src->format->BytesPerPixel;
+        info.d_pixels = (Uint8 *) dst->pixels +
+            (Uint16) dstrect->y * dst->pitch +
+            (Uint16) dstrect->x * dst->format->BytesPerPixel;
+        info.d_width = dstrect->w;
+        info.d_height = dstrect->h;
+        info.d_skip = dst->pitch - info.d_width * dst->format->BytesPerPixel;
+        info.aux_data = src->map->sw_data->aux_data;
+        info.src = src->format;
+        info.table = src->map->table;
+        info.dst = dst->format;
+        RunBlit = src->map->sw_data->blit;
 
-		/* Run the actual software blit */
-		RunBlit(&info);
-	}
+        /* Run the actual software blit */
+        RunBlit (&info);
+    }
 
-	/* We need to unlock the surfaces if they're locked */
-	if ( dst_locked ) {
-		SDL_UnlockSurface(dst);
-	}
-	if ( src_locked ) {
-		SDL_UnlockSurface(src);
-	}
-	/* Blit is done! */
-	return(okay ? 0 : -1);
+    /* We need to unlock the surfaces if they're locked */
+    if (dst_locked) {
+        SDL_UnlockSurface (dst);
+    }
+    if (src_locked) {
+        SDL_UnlockSurface (src);
+    }
+    /* Blit is done! */
+    return (okay ? 0 : -1);
 }
 
 #ifdef MMX_ASMBLIT
-static __inline__ void SDL_memcpyMMX(Uint8 *to, const Uint8 *from, int len)
+static __inline__ void
+SDL_memcpyMMX (Uint8 * to, const Uint8 * from, int len)
 {
-	int i;
+    int i;
 
-	for(i=0; i<len/8; i++) {
-		__asm__ __volatile__ (
-		"	movq (%0), %%mm0\n"
-		"	movq %%mm0, (%1)\n"
-		: : "r" (from), "r" (to) : "memory");
-		from+=8;
-		to+=8;
-	}
-	if (len&7)
-		SDL_memcpy(to, from, len&7);
+    for (i = 0; i < len / 8; i++) {
+        __asm__ __volatile__ ("	movq (%0), %%mm0\n"
+                              "	movq %%mm0, (%1)\n"::"r" (from),
+                              "r" (to):"memory");
+        from += 8;
+        to += 8;
+    }
+    if (len & 7)
+        SDL_memcpy (to, from, len & 7);
 }
 
-static __inline__ void SDL_memcpySSE(Uint8 *to, const Uint8 *from, int len)
+static __inline__ void
+SDL_memcpySSE (Uint8 * to, const Uint8 * from, int len)
 {
-	int i;
+    int i;
 
-	__asm__ __volatile__ (
-	"	prefetchnta (%0)\n"
-	"	prefetchnta 64(%0)\n"
-	"	prefetchnta 128(%0)\n"
-	"	prefetchnta 192(%0)\n"
-	: : "r" (from) );
+    __asm__ __volatile__ ("	prefetchnta (%0)\n"
+                          "	prefetchnta 64(%0)\n"
+                          "	prefetchnta 128(%0)\n"
+                          "	prefetchnta 192(%0)\n"::"r" (from));
 
-	for(i=0; i<len/8; i++) {
-		__asm__ __volatile__ (
-		"	prefetchnta 256(%0)\n"
-		"	movq (%0), %%mm0\n"
-		"	movntq %%mm0, (%1)\n"
-		: : "r" (from), "r" (to) : "memory");
-		from+=8;
-		to+=8;
-	}
-	if (len&7)
-		SDL_memcpy(to, from, len&7);
+    for (i = 0; i < len / 8; i++) {
+        __asm__ __volatile__ ("	prefetchnta 256(%0)\n"
+                              "	movq (%0), %%mm0\n"
+                              "	movntq %%mm0, (%1)\n"::"r" (from),
+                              "r" (to):"memory");
+        from += 8;
+        to += 8;
+    }
+    if (len & 7)
+        SDL_memcpy (to, from, len & 7);
 }
 #endif
 
-static void SDL_BlitCopy(SDL_BlitInfo *info)
+static void
+SDL_BlitCopy (SDL_BlitInfo * info)
 {
-	Uint8 *src, *dst;
-	int w, h;
-	int srcskip, dstskip;
+    Uint8 *src, *dst;
+    int w, h;
+    int srcskip, dstskip;
 
-	w = info->d_width*info->dst->BytesPerPixel;
-	h = info->d_height;
-	src = info->s_pixels;
-	dst = info->d_pixels;
-	srcskip = w+info->s_skip;
-	dstskip = w+info->d_skip;
+    w = info->d_width * info->dst->BytesPerPixel;
+    h = info->d_height;
+    src = info->s_pixels;
+    dst = info->d_pixels;
+    srcskip = w + info->s_skip;
+    dstskip = w + info->d_skip;
 #ifdef MMX_ASMBLIT
-	if(SDL_HasSSE())
-	{
-		while ( h-- ) {
-			SDL_memcpySSE(dst, src, w);
-			src += srcskip;
-			dst += dstskip;
-		}
-		__asm__ __volatile__ (
-		"	emms\n"
-		::);
-	}
-	else
-	if(SDL_HasMMX())
-	{
-		while ( h-- ) {
-			SDL_memcpyMMX(dst, src, w);
-			src += srcskip;
-			dst += dstskip;
-		}
-		__asm__ __volatile__ (
-		"	emms\n"
-		::);
-	}
-	else
+    if (SDL_HasSSE ()) {
+        while (h--) {
+            SDL_memcpySSE (dst, src, w);
+            src += srcskip;
+            dst += dstskip;
+        }
+        __asm__ __volatile__ ("	emms\n"::);
+    } else if (SDL_HasMMX ()) {
+        while (h--) {
+            SDL_memcpyMMX (dst, src, w);
+            src += srcskip;
+            dst += dstskip;
+        }
+        __asm__ __volatile__ ("	emms\n"::);
+    } else
 #endif
-	while ( h-- ) {
-		SDL_memcpy(dst, src, w);
-		src += srcskip;
-		dst += dstskip;
-	}
+        while (h--) {
+            SDL_memcpy (dst, src, w);
+            src += srcskip;
+            dst += dstskip;
+        }
 }
 
-static void SDL_BlitCopyOverlap(SDL_BlitInfo *info)
+static void
+SDL_BlitCopyOverlap (SDL_BlitInfo * info)
 {
-	Uint8 *src, *dst;
-	int w, h;
-	int srcskip, dstskip;
+    Uint8 *src, *dst;
+    int w, h;
+    int srcskip, dstskip;
 
-	w = info->d_width*info->dst->BytesPerPixel;
-	h = info->d_height;
-	src = info->s_pixels;
-	dst = info->d_pixels;
-	srcskip = w+info->s_skip;
-	dstskip = w+info->d_skip;
-	if ( dst < src ) {
-		while ( h-- ) {
-			SDL_memcpy(dst, src, w);
-			src += srcskip;
-			dst += dstskip;
-		}
-	} else {
-		src += ((h-1) * srcskip);
-		dst += ((h-1) * dstskip);
-		while ( h-- ) {
-			SDL_revcpy(dst, src, w);
-			src -= srcskip;
-			dst -= dstskip;
-		}
-	}
+    w = info->d_width * info->dst->BytesPerPixel;
+    h = info->d_height;
+    src = info->s_pixels;
+    dst = info->d_pixels;
+    srcskip = w + info->s_skip;
+    dstskip = w + info->d_skip;
+    if (dst < src) {
+        while (h--) {
+            SDL_memcpy (dst, src, w);
+            src += srcskip;
+            dst += dstskip;
+        }
+    } else {
+        src += ((h - 1) * srcskip);
+        dst += ((h - 1) * dstskip);
+        while (h--) {
+            SDL_revcpy (dst, src, w);
+            src -= srcskip;
+            dst -= dstskip;
+        }
+    }
 }
 
 /* Figure out which of many blit routines to set up on a surface */
-int SDL_CalculateBlit(SDL_Surface *surface)
+int
+SDL_CalculateBlit (SDL_Surface * surface)
 {
-	int blit_index;
+    SDL_VideoDevice *_this = SDL_GetVideoDevice ();
+    const SDL_VideoInfo *info = SDL_GetVideoInfo ();
+    int blit_index;
+
+    /* Clean everything out to start */
+    if ((surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL) {
+        SDL_UnRLESurface (surface, 1);
+    }
+    surface->map->sw_blit = NULL;
+
+    /* Figure out if an accelerated hardware blit is possible */
+    surface->flags &= ~SDL_HWACCEL;
+    if (surface->map->identity) {
+        int hw_blit_ok;
 
-	/* Clean everything out to start */
-	if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) {
-		SDL_UnRLESurface(surface, 1);
-	}
-	surface->map->sw_blit = NULL;
+        if ((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE) {
+            /* We only support accelerated blitting to hardware */
+            if (surface->map->dst->flags & SDL_HWSURFACE) {
+                hw_blit_ok = info->blit_hw;
+            } else {
+                hw_blit_ok = 0;
+            }
+            if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
+                hw_blit_ok = info->blit_hw_CC;
+            }
+            if (hw_blit_ok && (surface->flags & SDL_SRCALPHA)) {
+                hw_blit_ok = info->blit_hw_A;
+            }
+        } else {
+            /* We only support accelerated blitting to hardware */
+            if (surface->map->dst->flags & SDL_HWSURFACE) {
+                hw_blit_ok = info->blit_sw;
+            } else {
+                hw_blit_ok = 0;
+            }
+            if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
+                hw_blit_ok = info->blit_sw_CC;
+            }
+            if (hw_blit_ok && (surface->flags & SDL_SRCALPHA)) {
+                hw_blit_ok = info->blit_sw_A;
+            }
+        }
+        if (hw_blit_ok) {
+            _this->CheckHWBlit (_this, surface, surface->map->dst);
+        }
+    }
 
-	/* Figure out if an accelerated hardware blit is possible */
-	surface->flags &= ~SDL_HWACCEL;
-	if ( surface->map->identity ) {
-		int hw_blit_ok;
+    /* if an alpha pixel format is specified, we can accelerate alpha blits */
+    if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE)
+        && (_this->displayformatalphapixel)) {
+        if ((surface->flags & SDL_SRCALPHA))
+            if (info->blit_hw_A) {
+                _this->CheckHWBlit (_this, surface, surface->map->dst);
+            }
+    }
 
-		if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) {
-			/* We only support accelerated blitting to hardware */
-			if ( surface->map->dst->flags & SDL_HWSURFACE ) {
-				hw_blit_ok = current_video->info.blit_hw;
-			} else {
-				hw_blit_ok = 0;
-			}
-			if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
-				hw_blit_ok = current_video->info.blit_hw_CC;
-			}
-			if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
-				hw_blit_ok = current_video->info.blit_hw_A;
-			}
-		} else {
-			/* We only support accelerated blitting to hardware */
-			if ( surface->map->dst->flags & SDL_HWSURFACE ) {
-				hw_blit_ok = current_video->info.blit_sw;
-			} else {
-				hw_blit_ok = 0;
-			}
-			if (hw_blit_ok && (surface->flags & SDL_SRCCOLORKEY)) {
-				hw_blit_ok = current_video->info.blit_sw_CC;
-			}
-			if ( hw_blit_ok && (surface->flags & SDL_SRCALPHA) ) {
-				hw_blit_ok = current_video->info.blit_sw_A;
-			}
-		}
-		if ( hw_blit_ok ) {
-			SDL_VideoDevice *video = current_video;
-			SDL_VideoDevice *this  = current_video;
-			video->CheckHWBlit(this, surface, surface->map->dst);
-		}
-	}
-	
-	/* if an alpha pixel format is specified, we can accelerate alpha blits */
-	if (((surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE )&&(current_video->displayformatalphapixel)) 
-	{
-		if ( (surface->flags & SDL_SRCALPHA) ) 
-			if ( current_video->info.blit_hw_A ) {
-				SDL_VideoDevice *video = current_video;
-				SDL_VideoDevice *this  = current_video;
-				video->CheckHWBlit(this, surface, surface->map->dst);
-			}
-	}
-	
-	/* Get the blit function index, based on surface mode */
-	/* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
-	blit_index = 0;
-	blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY))      << 0;
-	if ( surface->flags & SDL_SRCALPHA
-	     && (surface->format->alpha != SDL_ALPHA_OPAQUE
-		 || surface->format->Amask) ) {
-	        blit_index |= 2;
-	}
+    /* Get the blit function index, based on surface mode */
+    /* { 0 = nothing, 1 = colorkey, 2 = alpha, 3 = colorkey+alpha } */
+    blit_index = 0;
+    blit_index |= (!!(surface->flags & SDL_SRCCOLORKEY)) << 0;
+    if (surface->flags & SDL_SRCALPHA
+        && (surface->format->alpha != SDL_ALPHA_OPAQUE
+            || surface->format->Amask)) {
+        blit_index |= 2;
+    }
+
+    /* Check for special "identity" case -- copy blit */
+    if (surface->map->identity && blit_index == 0) {
+        surface->map->sw_data->blit = SDL_BlitCopy;
 
-	/* Check for special "identity" case -- copy blit */
-	if ( surface->map->identity && blit_index == 0 ) {
-	        surface->map->sw_data->blit = SDL_BlitCopy;
+        /* Handle overlapping blits on the same surface */
+        if (surface == surface->map->dst) {
+            surface->map->sw_data->blit = SDL_BlitCopyOverlap;
+        }
+    } else {
+        if (surface->format->BitsPerPixel < 8) {
+            surface->map->sw_data->blit =
+                SDL_CalculateBlit0 (surface, blit_index);
+        } else {
+            switch (surface->format->BytesPerPixel) {
+            case 1:
+                surface->map->sw_data->blit =
+                    SDL_CalculateBlit1 (surface, blit_index);
+                break;
+            case 2:
+            case 3:
+            case 4:
+                surface->map->sw_data->blit =
+                    SDL_CalculateBlitN (surface, blit_index);
+                break;
+            default:
+                surface->map->sw_data->blit = NULL;
+                break;
+            }
+        }
+    }
+    /* Make sure we have a blit function */
+    if (surface->map->sw_data->blit == NULL) {
+        SDL_InvalidateMap (surface->map);
+        SDL_SetError ("Blit combination not supported");
+        return (-1);
+    }
 
-		/* Handle overlapping blits on the same surface */
-		if ( surface == surface->map->dst ) {
-		        surface->map->sw_data->blit = SDL_BlitCopyOverlap;
-		}
-	} else {
-		if ( surface->format->BitsPerPixel < 8 ) {
-			surface->map->sw_data->blit =
-			    SDL_CalculateBlit0(surface, blit_index);
-		} else {
-			switch ( surface->format->BytesPerPixel ) {
-			    case 1:
-				surface->map->sw_data->blit =
-				    SDL_CalculateBlit1(surface, blit_index);
-				break;
-			    case 2:
-			    case 3:
-			    case 4:
-				surface->map->sw_data->blit =
-				    SDL_CalculateBlitN(surface, blit_index);
-				break;
-			    default:
-				surface->map->sw_data->blit = NULL;
-				break;
-			}
-		}
-	}
-	/* Make sure we have a blit function */
-	if ( surface->map->sw_data->blit == NULL ) {
-		SDL_InvalidateMap(surface->map);
-		SDL_SetError("Blit combination not supported");
-		return(-1);
-	}
+    /* Choose software blitting function */
+    if (surface->flags & SDL_RLEACCELOK
+        && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
 
-	/* Choose software blitting function */
-	if(surface->flags & SDL_RLEACCELOK
-	   && (surface->flags & SDL_HWACCEL) != SDL_HWACCEL) {
+        if (surface->map->identity
+            && (blit_index == 1
+                || (blit_index == 3 && !surface->format->Amask))) {
+            if (SDL_RLESurface (surface) == 0)
+                surface->map->sw_blit = SDL_RLEBlit;
+        } else if (blit_index == 2 && surface->format->Amask) {
+            if (SDL_RLESurface (surface) == 0)
+                surface->map->sw_blit = SDL_RLEAlphaBlit;
+        }
+    }
 
-	        if(surface->map->identity
-		   && (blit_index == 1
-		       || (blit_index == 3 && !surface->format->Amask))) {
-		        if ( SDL_RLESurface(surface) == 0 )
-			        surface->map->sw_blit = SDL_RLEBlit;
-		} else if(blit_index == 2 && surface->format->Amask) {
-		        if ( SDL_RLESurface(surface) == 0 )
-			        surface->map->sw_blit = SDL_RLEAlphaBlit;
-		}
-	}
-	
-	if ( surface->map->sw_blit == NULL ) {
-		surface->map->sw_blit = SDL_SoftBlit;
-	}
-	return(0);
+    if (surface->map->sw_blit == NULL) {
+        surface->map->sw_blit = SDL_SoftBlit;
+    }
+    return (0);
 }
 
+/* vi: set ts=4 sw=4 expandtab: */