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short circuit FindSurfaceTraits for RGB

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This commit is contained in:
Glenn Maynard
2004-09-05 03:30:14 +00:00
parent 5035321672
commit 059d9b3783
1 changed files with 19 additions and 0 deletions
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stepmania/src/RageSurfaceUtils.cpp
+19
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@@ -314,9 +314,28 @@ int RageSurfaceUtils::FindSurfaceTraits( const RageSurface *img )
uint32_t max_alpha; uint32_t max_alpha;
if( img->format->BitsPerPixel == 8 ) if( img->format->BitsPerPixel == 8 )
{
/* Short circuit if we already know we have no transparency. */
bool bHaveNonOpaque = false;
for( int c = 0; !bHaveNonOpaque && c < img->format->palette->ncolors; ++c )
{
if( img->format->palette->colors[c].a != 256 )
bHaveNonOpaque = true;
}
if( !bHaveNonOpaque )
return TRAIT_NO_TRANSPARENCY;
max_alpha = 0xFF; max_alpha = 0xFF;
}
else else
{
/* Short circuit if we already know we have no transparency. */
if( img->format->Amask == 0 )
return TRAIT_NO_TRANSPARENCY;
max_alpha = img->format->Amask; max_alpha = img->format->Amask;
}
for(int y = 0; y < img->h; ++y) for(int y = 0; y < img->h; ++y)
{ {