// idea for higher precision blends in xfer procs (and slightly faster) // see DstATop as a probable caller static U8CPU mulmuldiv255round(U8CPU a, U8CPU b, U8CPU c, U8CPU d) { SkASSERT(a <= 255); SkASSERT(b <= 255); SkASSERT(c <= 255); SkASSERT(d <= 255); unsigned prod = SkMulS16(a, b) + SkMulS16(c, d) + 128; unsigned result = (prod + (prod >> 8)) >> 8; SkASSERT(result <= 255); return result; }
static inline bool S32A_D565_Blend_1(SkPMColor sc, uint16_t dc, U8CPU alpha) { unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha); unsigned dr = (SkMulS16(SkGetPackedR32(sc), alpha) >> 3) + SkMulS16(SkGetPackedR16(dc), dst_scale); unsigned dg = (SkMulS16(SkGetPackedG32(sc), alpha) >> 2) + SkMulS16(SkGetPackedG16(dc), dst_scale); unsigned rr = SkDiv255Round(dr); unsigned rg = SkDiv255Round(dg); if (rr <= 31 && rg <= 63) { return true; } return false; }
static inline bool S32A_D565_Blend_02(SkPMColor sc, uint16_t dc, U8CPU alpha) { unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha); unsigned dr = SkMulS16(SkGetPackedR32(sc), alpha) + SkMulS16(GetPackedR16As32(dc), dst_scale); unsigned dg = SkMulS16(SkGetPackedG32(sc), alpha) + SkMulS16(GetPackedG16As32(dc), dst_scale); unsigned db = SkMulS16(SkGetPackedB32(sc), alpha) + SkMulS16(GetPackedB16As32(dc), dst_scale); int rc = SkPack888ToRGB16(SkDiv255Round(dr), SkDiv255Round(dg), SkDiv255Round(db)); unsigned rr = SkGetPackedR16(rc); unsigned rg = SkGetPackedG16(rc); if (rr <= 31 && rg <= 63) { return true; } return false; }