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Diffstat (limited to 'src/blitter/32bpp_sse2.hpp')
| -rw-r--r-- | src/blitter/32bpp_sse2.hpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/blitter/32bpp_sse2.hpp b/src/blitter/32bpp_sse2.hpp index 98acb8cd1..386b5d3e3 100644 --- a/src/blitter/32bpp_sse2.hpp +++ b/src/blitter/32bpp_sse2.hpp @@ -81,6 +81,19 @@ typedef union ALIGN(16) um128i { PACK_AB_WITHOUT_SATURATION(srcAB, srcABCD); \ } +/* Darken 2 pixels. + * rgb = rgb * ((256/4) * 4 - (alpha/4)) / ((256/4) * 4) + */ +#define DARKEN_2() \ + __m128i srcAB = _mm_unpacklo_epi8(srcABCD, _mm_setzero_si128()); \ + __m128i dstAB = _mm_unpacklo_epi8(dstABCD, _mm_setzero_si128()); \ + __m128i PUT_ALPHA_IN_FRONT_OF_RGB(srcAB, alphaAB); \ + alphaAB = _mm_srli_epi16(alphaAB, 2); /* Reduce to 64 levels of shades so the max value fits in 16 bits. */ \ + __m128i nom = _mm_sub_epi16(tr_nom_base, alphaAB); \ + dstAB = _mm_mullo_epi16(dstAB, nom); \ + dstAB = _mm_srli_epi16(dstAB, 8); \ + dstAB = _mm_packus_epi16(dstAB, dstAB); + /** Base methods for 32bpp SSE blitters. */ class Blitter_32bppSSE_Base { public: |