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simplify/optimize blit_same_type

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Glenn Maynard
2004-08-07 17:43:22 +00:00
parent 52783ddfe2
commit a7badfb3ba
1 changed files with 11 additions and 26 deletions
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stepmania/src/RageSurfaceUtils.cpp
+11 -26
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@@ -458,36 +458,21 @@ void RageSurfaceUtils::BlitTransform( const RageSurface *src, RageSurface *dst,
static void blit_same_type( RageSurface *src_surf, const RageSurface *dst_surf, int width, int height )
{
const char *src = (const char *) src_surf->pixels;
const char *dst = (const char *) dst_surf->pixels;
char *dst = (char *) dst_surf->pixels;
/* Bytes to skip at the end of a line. */
const int srcskip = src_surf->pitch - width*src_surf->format->BytesPerPixel;
const int dstskip = dst_surf->pitch - width*dst_surf->format->BytesPerPixel;
/* If possible, memcpy the whole thing. */
if( src_surf->w == width && dst_surf->w == width && src_surf->pitch == dst_surf->pitch )
{
memcpy( dst, src, height*src_surf->pitch );
return;
}
/* XXX: duff's this */
/* The rows don't line up, so memcpy row by row. */
while( height-- )
{
int x = 0;
while( x++ < width )
{
/* (Relatively) fast. */
switch( src_surf->format->BytesPerPixel )
{
case 1: *((uint8_t *)dst) = *((uint8_t *)src); break;
case 2: *((uint16_t *)dst) = *((uint16_t *)src); break;
case 3: ((uint8_t *)dst)[0] = ((uint8_t *)src)[0];
((uint8_t *)dst)[1] = ((uint8_t *)src)[1];
((uint8_t *)dst)[2] = ((uint8_t *)src)[2];
break;
case 4: *((uint32_t *)dst) = *((uint32_t *)src); break;
}
src += src_surf->format->BytesPerPixel;
dst += dst_surf->format->BytesPerPixel;
}
src += srcskip;
dst += dstskip;
memcpy( dst, src, width*src_surf->format->BytesPerPixel );
src += src_surf->pitch;
dst += dst_surf->pitch;
}
}