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comparison src/video/SDL_blit_A.c @ 3363:90aec03bf9fd

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Fixed bug #627 Increased accuracy of alpha blend calculation
author Sam Lantinga <slouken@libsdl.org>
date Sat, 10 Oct 2009 07:48:57 +0000
parents ff602fdfdedc
children baeff5f3203b
comparison
equal deleted inserted replaced
3362:4e83cdb58134 3363:90aec03bf9fd
627 if(sA) { \ 627 if(sA) { \
628 unsigned short dstpixel = *((unsigned short *)dst); \ 628 unsigned short dstpixel = *((unsigned short *)dst); \
629 dR = (dstpixel >> 8) & 0xf8; \ 629 dR = (dstpixel >> 8) & 0xf8; \
630 dG = (dstpixel >> 3) & 0xfc; \ 630 dG = (dstpixel >> 3) & 0xfc; \
631 dB = (dstpixel << 3) & 0xf8; \ 631 dB = (dstpixel << 3) & 0xf8; \
632 ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \ 632 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
633 *((unsigned short *)dst) = ( \ 633 *((unsigned short *)dst) = ( \
634 ((dR & 0xf8) << 8) | ((dG & 0xfc) << 3) | (dB >> 3) \ 634 ((dR & 0xf8) << 8) | ((dG & 0xfc) << 3) | (dB >> 3) \
635 ); \ 635 ); \
636 } \ 636 } \
637 src += 4; \ 637 src += 4; \
773 unsigned sR, sG, sB, dR, dG, dB; \ 773 unsigned sR, sG, sB, dR, dG, dB; \
774 RETRIEVE_RGB_PIXEL(((Uint8 *)srcp), 4, Pixel); \ 774 RETRIEVE_RGB_PIXEL(((Uint8 *)srcp), 4, Pixel); \
775 if(sA && Pixel != ckey) { \ 775 if(sA && Pixel != ckey) { \
776 RGB_FROM_PIXEL(Pixel, srcfmt, sR, sG, sB); \ 776 RGB_FROM_PIXEL(Pixel, srcfmt, sR, sG, sB); \
777 DISEMBLE_RGB(((Uint8 *)dstp), 4, dstfmt, Pixel, dR, dG, dB); \ 777 DISEMBLE_RGB(((Uint8 *)dstp), 4, dstfmt, Pixel, dR, dG, dB); \
778 ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \ 778 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
779 ASSEMBLE_RGBA(((Uint8 *)dstp), 4, dstfmt, dR, dG, dB, dA); \ 779 ASSEMBLE_RGBA(((Uint8 *)dstp), 4, dstfmt, dR, dG, dB, dA); \
780 } \ 780 } \
781 dstp++; \ 781 dstp++; \
782 srcp++; \ 782 srcp++; \
783 widthvar--; \ 783 widthvar--; \
880 Uint32 Pixel; \ 880 Uint32 Pixel; \
881 unsigned sR, sG, sB, dR, dG, dB, sA, dA; \ 881 unsigned sR, sG, sB, dR, dG, dB, sA, dA; \
882 DISEMBLE_RGBA((Uint8 *)srcp, 4, srcfmt, Pixel, sR, sG, sB, sA); \ 882 DISEMBLE_RGBA((Uint8 *)srcp, 4, srcfmt, Pixel, sR, sG, sB, sA); \
883 if(sA) { \ 883 if(sA) { \
884 DISEMBLE_RGBA((Uint8 *)dstp, 4, dstfmt, Pixel, dR, dG, dB, dA); \ 884 DISEMBLE_RGBA((Uint8 *)dstp, 4, dstfmt, Pixel, dR, dG, dB, dA); \
885 ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \ 885 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
886 ASSEMBLE_RGBA((Uint8 *)dstp, 4, dstfmt, dR, dG, dB, dA); \ 886 ASSEMBLE_RGBA((Uint8 *)dstp, 4, dstfmt, dR, dG, dB, dA); \
887 } \ 887 } \
888 ++srcp; \ 888 ++srcp; \
889 ++dstp; \ 889 ++dstp; \
890 widthvar--; \ 890 widthvar--; \
1080 #define ONE_PIXEL_BLEND(condition, widthvar) while ((condition)) { \ 1080 #define ONE_PIXEL_BLEND(condition, widthvar) while ((condition)) { \
1081 Uint32 Pixel; \ 1081 Uint32 Pixel; \
1082 unsigned sR, sG, sB, dR, dG, dB; \ 1082 unsigned sR, sG, sB, dR, dG, dB; \
1083 DISEMBLE_RGB(((Uint8 *)srcp), 4, srcfmt, Pixel, sR, sG, sB); \ 1083 DISEMBLE_RGB(((Uint8 *)srcp), 4, srcfmt, Pixel, sR, sG, sB); \
1084 DISEMBLE_RGB(((Uint8 *)dstp), 4, dstfmt, Pixel, dR, dG, dB); \ 1084 DISEMBLE_RGB(((Uint8 *)dstp), 4, dstfmt, Pixel, dR, dG, dB); \
1085 ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \ 1085 ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB); \
1086 ASSEMBLE_RGBA(((Uint8 *)dstp), 4, dstfmt, dR, dG, dB, dA); \ 1086 ASSEMBLE_RGBA(((Uint8 *)dstp), 4, dstfmt, dR, dG, dB, dA); \
1087 ++srcp; \ 1087 ++srcp; \
1088 ++dstp; \ 1088 ++dstp; \
1089 widthvar--; \ 1089 widthvar--; \
1090 } 1090 }