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fix traits detection for surfaces with partial alpha, but no alpha=0 pixels

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This commit is contained in:
Chris Danford
2003-04-06 01:26:48 +00:00
parent 494dddce12
commit 9d163b0273
1 changed files with 16 additions and 12 deletions
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stepmania/src/SDL_utils.cpp
+16 -12
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@@ -396,8 +396,10 @@ int FindSurfaceTraits(const SDL_Surface *img)
{
// bool HaveAlphaValue = false; /* whether ar, ag, ab is valid */
// bool HaveConsistentAlphaValue = true;
bool HaveTransparency = false;
bool HaveTranslucensy = false;
const int NEEDS_NO_ALPHA=0, NEEDS_BOOL_ALPHA=1, NEEDS_FULL_ALPHA=2;
int alpha_type = NEEDS_NO_ALPHA;
// bool HaveTransparency = false;
// bool HaveTranslucensy = false;
// bool WhiteOnly = true;
for(int y = 0; y < img->h; ++y)
@@ -409,20 +411,17 @@ int FindSurfaceTraits(const SDL_Surface *img)
{
Uint32 val = decodepixel(row, img->format->BytesPerPixel);
bool Transparent = false;
bool Translucent = false;
if( img->format->BitsPerPixel == 8 ) {
if(img->flags & SDL_SRCCOLORKEY && val == img->format->colorkey )
Transparent = true;
alpha_type = max( alpha_type, NEEDS_BOOL_ALPHA );
} else if(img->format->Amask) {
Uint32 masked_alpha = val & img->format->Amask;
if(masked_alpha == 0) Transparent = true;
else if(masked_alpha != img->format->Amask) Translucent = true;
if(masked_alpha == 0)
alpha_type = max( alpha_type, NEEDS_BOOL_ALPHA );
else if(masked_alpha != img->format->Amask)
alpha_type = max( alpha_type, NEEDS_FULL_ALPHA );
}
if(Transparent) HaveTransparency = true;
if(Translucent) HaveTranslucensy = true;
#if 0
/* Hmm. This doesn't quite work. For example, the ScreenCompany
* shadow is actually black; we load it as 8alphaonly, which discards
@@ -479,8 +478,13 @@ int FindSurfaceTraits(const SDL_Surface *img)
int ret = 0;
// if(HaveConsistentAlphaValue) ret |= TRAIT_CONSISTENT_TRANSPARENT_COLOR;
if(!HaveTransparency) ret |= TRAIT_NO_TRANSPARENCY;
if(!HaveTranslucensy) ret |= TRAIT_BOOL_TRANSPARENCY;
switch( alpha_type )
{
case NEEDS_NO_ALPHA: ret |= TRAIT_NO_TRANSPARENCY; break;
case NEEDS_BOOL_ALPHA: ret |= TRAIT_BOOL_TRANSPARENCY; break;
case NEEDS_FULL_ALPHA: break;
default: ASSERT(0);
}
// if(WhiteOnly) ret |= TRAIT_WHITE_ONLY;
return ret;
}