Mercurial > sdl-ios-xcode
changeset 3437:dc2911c207e4
Thank you automated tests (and bobbens!), fixed alpha blending for accuracy
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 16 Nov 2009 09:47:34 +0000 |
| parents | 0538362b98d3 |
| children | ca5663493497 |
| files | src/video/SDL_blit.h |
| diffstat | 1 files changed, 3 insertions(+), 3 deletions(-) [+] |
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--- a/src/video/SDL_blit.h Mon Nov 16 07:39:08 2009 +0000 +++ b/src/video/SDL_blit.h Mon Nov 16 09:47:34 2009 +0000 @@ -444,9 +444,9 @@ /* Blend the RGB values of two Pixels based on a source alpha value */ #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ do { \ - dR = (((sR-dR)*(A)+255)>>8)+dR; \ - dG = (((sG-dG)*(A)+255)>>8)+dG; \ - dB = (((sB-dB)*(A)+255)>>8)+dB; \ + dR = ((((int)(sR-dR)*(int)A)/255)+dR); \ + dG = ((((int)(sG-dG)*(int)A)/255)+dG); \ + dB = ((((int)(sB-dB)*(int)A)/255)+dB); \ } while(0)