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simplify blit selection by letting each blit decide for itself

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This commit is contained in:
Glenn Maynard
2004-09-05 22:35:53 +00:00
parent 174810d286
commit 9f38c2237c
1 changed files with 33 additions and 26 deletions
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stepmania/src/RageSurfaceUtils.cpp
+33 -26
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@@ -480,8 +480,15 @@ void RageSurfaceUtils::BlitTransform( const RageSurface *src, RageSurface *dst,
* No general blitting rects.
*/
static void blit_same_type( const RageSurface *src_surf, const RageSurface *dst_surf, int width, int height )
static bool blit_same_type( const RageSurface *src_surf, const RageSurface *dst_surf, int width, int height )
{
if( src_surf->format->BytesPerPixel != dst_surf->format->BytesPerPixel ||
src_surf->format->Rmask != dst_surf->format->Rmask ||
src_surf->format->Gmask != dst_surf->format->Gmask ||
src_surf->format->Bmask != dst_surf->format->Bmask ||
src_surf->format->Amask != dst_surf->format->Amask )
return false;
const uint8_t *src = src_surf->pixels;
uint8_t *dst = dst_surf->pixels;
@@ -489,7 +496,7 @@ static void blit_same_type( const RageSurface *src_surf, const RageSurface *dst_
if( src_surf->w == width && dst_surf->w == width && src_surf->pitch == dst_surf->pitch )
{
memcpy( dst, src, height*src_surf->pitch );
return;
return true;
}
/* The rows don't line up, so memcpy row by row. */
@@ -499,12 +506,17 @@ static void blit_same_type( const RageSurface *src_surf, const RageSurface *dst_
src += src_surf->pitch;
dst += dst_surf->pitch;
}
return true;
}
/* Rescaling blit with no ckey. This is used to update movies in
* D3D, so optimization is very important. */
static void blit_rgba_to_rgba( const RageSurface *src_surf, const RageSurface *dst_surf, int width, int height )
static bool blit_rgba_to_rgba( const RageSurface *src_surf, const RageSurface *dst_surf, int width, int height )
{
if( src_surf->format->BytesPerPixel == 1 || dst_surf->format->BytesPerPixel == 1 )
return false;
const uint8_t *src = src_surf->pixels;
uint8_t *dst = dst_surf->pixels;
@@ -594,10 +606,15 @@ static void blit_rgba_to_rgba( const RageSurface *src_surf, const RageSurface *d
src += srcskip;
dst += dstskip;
}
return true;
}
static void blit_generic( const RageSurface *src_surf, const RageSurface *dst_surf, int width, int height )
static bool blit_generic( const RageSurface *src_surf, const RageSurface *dst_surf, int width, int height )
{
if( src_surf->format->BytesPerPixel != 1 || dst_surf->format->BytesPerPixel == 1 )
return false;
const uint8_t *src = src_surf->pixels;
uint8_t *dst = dst_surf->pixels;
@@ -631,6 +648,7 @@ static void blit_generic( const RageSurface *src_surf, const RageSurface *dst_su
dst += dstskip;
}
return true;
}
/* Blit src onto dst. */
@@ -643,36 +661,25 @@ void RageSurfaceUtils::Blit( const RageSurface *src, RageSurface *dst, int width
width = min(src->w, dst->w);
height = min(src->h, dst->h);
/*
* Types of blits:
* RGBA->RGBA or PAL->PAL, same format (possibly different pitch)
* RGBA->RGBA different formats
* PAL->RGBA
*/
if( src->format->BytesPerPixel == dst->format->BytesPerPixel &&
src->format->Rmask == dst->format->Rmask &&
src->format->Gmask == dst->format->Gmask &&
src->format->Bmask == dst->format->Bmask &&
src->format->Amask == dst->format->Amask )
/* Try each blit until we find one that works; run them in order of efficiency,
* so we use the fastest blit possible. */
do
{
/* RGBA->RGBA with the same format, or PAL->PAL. Simple copy. */
blit_same_type(src, dst, width, height);
}
if( blit_same_type(src, dst, width, height) )
break;
else if( src->format->BytesPerPixel != 1 && dst->format->BytesPerPixel != 1 )
{
/* RGBA->RGBA with different formats. */
blit_rgba_to_rgba(src, dst, width, height);
}
if( blit_rgba_to_rgba(src, dst, width, height) )
break;
else if( src->format->BytesPerPixel == 1 && dst->format->BytesPerPixel != 1 )
{
/* PAL->RGBA. */
blit_generic(src, dst, width, height);
}
else
if( blit_generic(src, dst, width, height) )
break;
/* We don't do RGBA->PAL. */
ASSERT(0);
} while(0);
/*
* The destination surface may be larger than the source. For example, we may be