static SkPMColor mult_modeproc(SkPMColor src, SkPMColor dst) {
int a = SkAlphaMulAlpha(SkGetPackedA32(src), SkGetPackedA32(dst));
int r = SkAlphaMulAlpha(SkGetPackedR32(src), SkGetPackedR32(dst));
int g = SkAlphaMulAlpha(SkGetPackedG32(src), SkGetPackedG32(dst));
int b = SkAlphaMulAlpha(SkGetPackedB32(src), SkGetPackedB32(dst));
return SkPackARGB32(a, r, g, b);
}
static uint16_t srcatop_modeproc16(SkPMColor src, uint16_t dst) {
unsigned isa = 255 - SkGetPackedA32(src);
return SkPackRGB16(
SkPacked32ToR16(src) + SkAlphaMulAlpha(SkGetPackedR16(dst), isa),
SkPacked32ToG16(src) + SkAlphaMulAlpha(SkGetPackedG16(dst), isa),
SkPacked32ToB16(src) + SkAlphaMulAlpha(SkGetPackedB16(dst), isa));
}
// kColorBurn_Mode
static inline int colorburn_byte(int sc, int dc, int sa, int da) {
int rc;
if (dc == da) {
rc = sa * da + sc * (255 - da) + dc * (255 - sa);
} else if (0 == sc) {
return SkAlphaMulAlpha(dc, 255 - sa);
} else {
int tmp = (da - dc) * sa / sc;
rc = sa * (da - ((da < tmp) ? da : tmp))
+ sc * (255 - da) + dc * (255 - sa);
}
return clamp_div255round(rc);
}
// kColorDodge_Mode
static inline int colordodge_byte(int sc, int dc, int sa, int da) {
int diff = sa - sc;
int rc;
if (0 == dc) {
return SkAlphaMulAlpha(sc, 255 - da);
} else if (0 == diff) {
rc = sa * da + sc * (255 - da) + dc * (255 - sa);
} else {
diff = dc * sa / diff;
rc = sa * ((da < diff) ? da : diff) + sc * (255 - da) + dc * (255 - sa);
}
return clamp_div255round(rc);
}
// kXor_Mode [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc]
static SkPMColor xor_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned isa = 255 - sa;
unsigned ida = 255 - da;
return SkPackARGB32(sa + da - (SkAlphaMulAlpha(sa, da) << 1),
SkAlphaMulAlpha(ida, SkGetPackedR32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedR32(dst)),
SkAlphaMulAlpha(ida, SkGetPackedG32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedG32(dst)),
SkAlphaMulAlpha(ida, SkGetPackedB32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedB32(dst)));
}
static SkPMColor lighten_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned src_scale = SkAlpha255To256(255 - sa);
unsigned dst_scale = SkAlpha255To256(255 - da);
unsigned ra = sa + da - SkAlphaMulAlpha(sa, da);
unsigned rr = lighten_p(SkGetPackedR32(src), SkGetPackedR32(dst),
src_scale, dst_scale);
unsigned rg = lighten_p(SkGetPackedG32(src), SkGetPackedG32(dst),
src_scale, dst_scale);
unsigned rb = lighten_p(SkGetPackedB32(src), SkGetPackedB32(dst),
src_scale, dst_scale);
return SkPackARGB32(ra, SkFastMin32(rr, ra),
SkFastMin32(rg, ra), SkFastMin32(rb, ra));
}
virtual void xferA8(SK_RESTRICT SkAlpha dst[],
const SK_RESTRICT SkPMColor[], int count,
const SK_RESTRICT SkAlpha aa[]) {
SkASSERT(dst && count >= 0);
if (NULL == aa) {
memset(dst, 0, count);
} else {
for (int i = count - 1; i >= 0; --i) {
unsigned a = aa[i];
if (0xFF == a) {
dst[i] = 0;
} else if (0 != a) {
dst[i] = SkAlphaMulAlpha(dst[i], 255 - a);
}
}
}
}
// kSrcATop_Mode, //!< [Da, Sc * Da + (1 - Sa) * Dc]
static SkPMColor srcatop_modeproc(SkPMColor src, SkPMColor dst) {
unsigned sa = SkGetPackedA32(src);
unsigned da = SkGetPackedA32(dst);
unsigned isa = 255 - sa;
return SkPackARGB32(da,
SkAlphaMulAlpha(da, SkGetPackedR32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedR32(dst)),
SkAlphaMulAlpha(da, SkGetPackedG32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedG32(dst)),
SkAlphaMulAlpha(da, SkGetPackedB32(src)) +
SkAlphaMulAlpha(isa, SkGetPackedB32(dst)));
}
static inline int screen_byte(int a, int b) {
return a + b - SkAlphaMulAlpha(a, b);
}
static inline int srcover_byte(int a, int b) {
return a + b - SkAlphaMulAlpha(a, b);
}