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Fixed bug #627

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Increased accuracy of alpha blend calculation

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404009
This commit is contained in:
Sam Lantinga 2009-10-10 07:48:57 +00:00
parent 885758b318
commit 7e6cba931b
2 changed files with 7 additions and 20 deletions
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8
src/video/SDL_blit_A.c
View file

@ -629,7 +629,7 @@ Blit32to565PixelAlphaAltivec(SDL_BlitInfo * info)
dR = (dstpixel >> 8) & 0xf8; \
dG = (dstpixel >> 3) & 0xfc; \
dB = (dstpixel << 3) & 0xf8; \
ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
*((unsigned short *)dst) = ( \
((dR & 0xf8) << 8) | ((dG & 0xfc) << 3) | (dB >> 3) \
); \
@ -775,7 +775,7 @@ Blit32to32SurfaceAlphaKeyAltivec(SDL_BlitInfo * info)
if(sA && Pixel != ckey) { \
RGB_FROM_PIXEL(Pixel, srcfmt, sR, sG, sB); \
DISEMBLE_RGB(((Uint8 *)dstp), 4, dstfmt, Pixel, dR, dG, dB); \
ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
ASSEMBLE_RGBA(((Uint8 *)dstp), 4, dstfmt, dR, dG, dB, dA); \
} \
dstp++; \
@ -882,7 +882,7 @@ Blit32to32PixelAlphaAltivec(SDL_BlitInfo * info)
DISEMBLE_RGBA((Uint8 *)srcp, 4, srcfmt, Pixel, sR, sG, sB, sA); \
if(sA) { \
DISEMBLE_RGBA((Uint8 *)dstp, 4, dstfmt, Pixel, dR, dG, dB, dA); \
ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
ASSEMBLE_RGBA((Uint8 *)dstp, 4, dstfmt, dR, dG, dB, dA); \
} \
++srcp; \
@ -1082,7 +1082,7 @@ Blit32to32SurfaceAlphaAltivec(SDL_BlitInfo * info)
unsigned sR, sG, sB, dR, dG, dB; \
DISEMBLE_RGB(((Uint8 *)srcp), 4, srcfmt, Pixel, sR, sG, sB); \
DISEMBLE_RGB(((Uint8 *)dstp), 4, dstfmt, Pixel, dR, dG, dB); \
ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
ASSEMBLE_RGBA(((Uint8 *)dstp), 4, dstfmt, dR, dG, dB, dA); \
++srcp; \
++dstp; \