コード例 #1
0
ファイル: SkXfermode.cpp プロジェクト: Dieken/SurfaceFlinger 
// 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;
}
コード例 #2
0
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;
}
コード例 #3
0
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;
}