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simplify a little, comment

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This commit is contained in:
Glenn Maynard
2004-08-28 08:29:13 +00:00
parent 0169f9fcf6
commit 6009e72fc6
1 changed files with 15 additions and 13 deletions
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stepmania/src/RageBitmapTexture.cpp
+15 -13
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@@ -211,21 +211,23 @@ void RageBitmapTexture::Create()
default:
RageException::Throw( "Invalid color depth: %d bits", actualID.iColorDepth );
}
}
/* It's either not a paletted image, or we can't handle paletted textures.
* Convert to the desired RGBA format, dithering if appropriate. */
if( actualID.bDither &&
(pixfmt==RageDisplay::FMT_RGBA4 || pixfmt==RageDisplay::FMT_RGB5A1) ) /* Don't dither if format is 32bpp; there's no point. */
{
/* Dither down to the destination format. */
const RageDisplay::PixelFormatDesc *pfd = DISPLAY->GetPixelFormatDesc(pixfmt);
RageSurface *dst = CreateSurface( img->w, img->h, pfd->bpp,
pfd->masks[0], pfd->masks[1], pfd->masks[2], pfd->masks[3] );
/* Dither if appropriate. XXX: This is a special case: don't bother dithering to
* RGBA8888. We actually want to dither only if the destination has greater color
* depth on at least one color channel than the source. For example, it doesn't
* make sense to do this when pixfmt is RGBA5551 if the image is only RGBA555. */
if( actualID.bDither &&
(pixfmt==RageDisplay::FMT_RGBA4 || pixfmt==RageDisplay::FMT_RGB5A1) )
{
/* Dither down to the destination format. */
const RageDisplay::PixelFormatDesc *pfd = DISPLAY->GetPixelFormatDesc(pixfmt);
RageSurface *dst = CreateSurface( img->w, img->h, pfd->bpp,
pfd->masks[0], pfd->masks[1], pfd->masks[2], pfd->masks[3] );
SM_SDL_ErrorDiffusionDither(img, dst);
delete img;
img = dst;
}
SM_SDL_ErrorDiffusionDither(img, dst);
delete img;
img = dst;
}
/* This needs to be done *after* the final resize, since that resize