void SkAvoidXfermode::xfer4444(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[])
{
unsigned opR = SkColorGetR(fOpColor) >> 4;
unsigned opG = SkColorGetG(fOpColor) >> 4;
unsigned opB = SkColorGetB(fOpColor) >> 4;
uint32_t mul = fDistMul;
uint32_t sub = (fDistMul - (1 << 14)) << 4;
int MAX, mask;
if (kTargetColor_Mode == fMode) {
mask = -1;
MAX = 15;
} else {
mask = 0;
MAX = 0;
}
for (int i = 0; i < count; i++) {
int d = color_dist4444(dst[i], opR, opG, opB);
// now reverse d if we need to
d = MAX + (d ^ mask) - mask;
SkASSERT((unsigned)d <= 15);
// convert from 0..15 to 0..16
d += d >> 3;
d = scale_dist_14(d, mul, sub);
SkASSERT(d <= 16);
if (d > 0) {
if (NULL != aa) {
d = SkAlphaMul(d, Accurate255To256(*aa++));
if (0 == d) {
continue;
}
}
dst[i] = SkBlend4444(SkPixel32ToPixel4444(src[i]), dst[i], d);
}
}
}
void SkAvoidXfermode::xfer32(SkPMColor dst[], const SkPMColor src[], int count,
const SkAlpha aa[])
{
unsigned opR = SkColorGetR(fOpColor);
unsigned opG = SkColorGetG(fOpColor);
unsigned opB = SkColorGetB(fOpColor);
uint32_t mul = fDistMul;
uint32_t sub = (fDistMul - (1 << 14)) << 8;
int MAX, mask;
if (kTargetColor_Mode == fMode) {
mask = -1;
MAX = 255;
} else {
mask = 0;
MAX = 0;
}
for (int i = 0; i < count; i++) {
int d = color_dist32(dst[i], opR, opG, opB);
// now reverse d if we need to
d = MAX + (d ^ mask) - mask;
SkASSERT((unsigned)d <= 255);
d = Accurate255To256(d);
d = scale_dist_14(d, mul, sub);
SkASSERT(d <= 256);
if (d > 0) {
if (NULL != aa) {
d = SkAlphaMul(d, Accurate255To256(*aa++));
if (0 == d) {
continue;
}
}
dst[i] = SkFourByteInterp(src[i], dst[i], d);
}
}
}
void SkAvoidXfermode::xfer16(uint16_t dst[], const SkPMColor src[], int count,
const SkAlpha aa[]) const {
unsigned opR = SkColorGetR(fOpColor) >> (8 - SK_R16_BITS);
unsigned opG = SkColorGetG(fOpColor) >> (8 - SK_G16_BITS);
unsigned opB = SkColorGetB(fOpColor) >> (8 - SK_R16_BITS);
uint32_t mul = fDistMul;
uint32_t sub = (fDistMul - (1 << 14)) << SK_R16_BITS;
int MAX, mask;
if (kTargetColor_Mode == fMode) {
mask = -1;
MAX = 31;
} else {
mask = 0;
MAX = 0;
}
for (int i = 0; i < count; i++) {
int d = color_dist16(dst[i], opR, opG, opB);
// now reverse d if we need to
d = MAX + (d ^ mask) - mask;
SkASSERT((unsigned)d <= 31);
// convert from 0..31 to 0..32
d += d >> 4;
d = scale_dist_14(d, mul, sub);
SkASSERT(d <= 32);
if (d > 0) {
if (aa) {
d = SkAlphaMul(d, Accurate255To256(*aa++));
if (0 == d) {
continue;
}
}
dst[i] = SkBlend3216(src[i], dst[i], d);
}
}
}