void SkComposeShader::ComposeShaderContext::shadeSpan(int x, int y, SkPMColor result[], int count) {
SkShader::Context* shaderContextA = fShaderContextA;
SkShader::Context* shaderContextB = fShaderContextB;
SkBlendMode mode = static_cast<const SkComposeShader&>(fShader).fMode;
unsigned scale = SkAlpha255To256(this->getPaintAlpha());
SkPMColor tmp[TMP_COLOR_COUNT];
SkXfermode* xfer = SkXfermode::Peek(mode);
if (nullptr == xfer) { // implied SRC_OVER
// TODO: when we have a good test-case, should use SkBlitRow::Proc32
// for these loops
do {
int n = count;
if (n > TMP_COLOR_COUNT) {
n = TMP_COLOR_COUNT;
}
shaderContextA->shadeSpan(x, y, result, n);
shaderContextB->shadeSpan(x, y, tmp, n);
if (256 == scale) {
for (int i = 0; i < n; i++) {
result[i] = SkPMSrcOver(tmp[i], result[i]);
}
} else {
for (int i = 0; i < n; i++) {
result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]),
scale);
}
}
result += n;
x += n;
count -= n;
} while (count > 0);
} else { // use mode for the composition
do {
int n = count;
if (n > TMP_COLOR_COUNT) {
n = TMP_COLOR_COUNT;
}
shaderContextA->shadeSpan(x, y, result, n);
shaderContextB->shadeSpan(x, y, tmp, n);
xfer->xfer32(result, tmp, n, nullptr);
if (256 != scale) {
for (int i = 0; i < n; i++) {
result[i] = SkAlphaMulQ(result[i], scale);
}
}
result += n;
x += n;
count -= n;
} while (count > 0);
}
}
void SkComposeShader::shadeSpan(int x, int y, SkPMColor result[], int count) {
SkShader* shaderA = fShaderA;
SkShader* shaderB = fShaderB;
SkXfermode* mode = fMode;
unsigned scale = SkAlpha255To256(this->getPaintAlpha());
SkPMColor tmp[TMP_COLOR_COUNT];
if (NULL == mode) { // implied SRC_OVER
// TODO: when we have a good test-case, should use SkBlitRow::Proc32
// for these loops
do {
int n = count;
if (n > TMP_COLOR_COUNT) {
n = TMP_COLOR_COUNT;
}
shaderA->shadeSpan(x, y, result, n);
shaderB->shadeSpan(x, y, tmp, n);
if (256 == scale) {
for (int i = 0; i < n; i++) {
result[i] = SkPMSrcOver(tmp[i], result[i]);
}
} else {
for (int i = 0; i < n; i++) {
result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]),
scale);
}
}
result += n;
x += n;
count -= n;
} while (count > 0);
} else { // use mode for the composition
do {
int n = count;
if (n > TMP_COLOR_COUNT) {
n = TMP_COLOR_COUNT;
}
shaderA->shadeSpan(x, y, result, n);
shaderB->shadeSpan(x, y, tmp, n);
mode->xfer32(result, tmp, n, NULL);
if (256 == scale) {
for (int i = 0; i < n; i++) {
result[i] = SkAlphaMulQ(result[i], scale);
}
}
result += n;
x += n;
count -= n;
} while (count > 0);
}
}
static void srcover_row(SK_RESTRICT SkPMColor dst[],
const SK_RESTRICT SkPMColor16 src[], int count) {
do {
*dst = SkPMSrcOver(SkPixel4444ToPixel32(*src), *dst);
src += 1;
dst += 1;
} while (--count != 0);
}
void alphaBlendPremultiplied(blink::ImageFrame& src, blink::ImageFrame& dst, int canvasY, int left, int width)
{
for (int x = 0; x < width; ++x) {
int canvasX = left + x;
blink::ImageFrame::PixelData& pixel = *src.getAddr(canvasX, canvasY);
if (SkGetPackedA32(pixel) != 0xff) {
blink::ImageFrame::PixelData prevPixel = *dst.getAddr(canvasX, canvasY);
pixel = SkPMSrcOver(pixel, prevPixel);
}
}
}
void SkARGB32_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
const int16_t runs[]) {
SkPMColor* span = fBuffer;
uint32_t* device = fDevice.getAddr32(x, y);
SkShader* shader = fShader;
if (fXfermode) {
for (;;) {
SkXfermode* xfer = fXfermode;
int count = *runs;
if (count <= 0)
break;
int aa = *antialias;
if (aa) {
shader->shadeSpan(x, y, span, count);
if (aa == 255) {
xfer->xfer32(device, span, count, NULL);
} else {
// count is almost always 1
for (int i = count - 1; i >= 0; --i) {
xfer->xfer32(&device[i], &span[i], 1, antialias);
}
}
}
device += count;
runs += count;
antialias += count;
x += count;
}
} else if (fShader->getFlags() & SkShader::kOpaqueAlpha_Flag) {
for (;;) {
int count = *runs;
if (count <= 0) {
break;
}
int aa = *antialias;
if (aa) {
if (aa == 255) { // cool, have the shader draw right into the device
shader->shadeSpan(x, y, device, count);
} else {
shader->shadeSpan(x, y, span, count);
for (int i = count - 1; i >= 0; --i) {
if (span[i]) {
device[i] = SkBlendARGB32(span[i], device[i], aa);
}
}
}
}
device += count;
runs += count;
antialias += count;
x += count;
}
} else { // no xfermode but we are not opaque
for (;;) {
int count = *runs;
if (count <= 0) {
break;
}
int aa = *antialias;
if (aa) {
fShader->shadeSpan(x, y, span, count);
if (aa == 255) {
for (int i = count - 1; i >= 0; --i) {
if (span[i]) {
device[i] = SkPMSrcOver(span[i], device[i]);
}
}
} else {
for (int i = count - 1; i >= 0; --i) {
if (span[i]) {
device[i] = SkBlendARGB32(span[i], device[i], aa);
}
}
}
}
device += count;
runs += count;
antialias += count;
x += count;
}
}
}
void SkComposeShader::ComposeShaderContext::shadeSpan(int x, int y, SkPMColor result[], int count) {
SkShader::Context* shaderContextA = fShaderContextA;
SkShader::Context* shaderContextB = fShaderContextB;
SkXfermode* mode = static_cast<const SkComposeShader&>(fShader).fMode;
unsigned scale = SkAlpha255To256(this->getPaintAlpha());
#ifdef SK_BUILD_FOR_ANDROID
scale = 256; // ugh -- maintain old bug/behavior for now
#endif
SkPMColor tmp[TMP_COLOR_COUNT];
if (NULL == mode) { // implied SRC_OVER
// TODO: when we have a good test-case, should use SkBlitRow::Proc32
// for these loops
do {
int n = count;
if (n > TMP_COLOR_COUNT) {
n = TMP_COLOR_COUNT;
}
shaderContextA->shadeSpan(x, y, result, n);
shaderContextB->shadeSpan(x, y, tmp, n);
if (256 == scale) {
for (int i = 0; i < n; i++) {
result[i] = SkPMSrcOver(tmp[i], result[i]);
}
} else {
for (int i = 0; i < n; i++) {
result[i] = SkAlphaMulQ(SkPMSrcOver(tmp[i], result[i]),
scale);
}
}
result += n;
x += n;
count -= n;
} while (count > 0);
} else { // use mode for the composition
do {
int n = count;
if (n > TMP_COLOR_COUNT) {
n = TMP_COLOR_COUNT;
}
shaderContextA->shadeSpan(x, y, result, n);
shaderContextB->shadeSpan(x, y, tmp, n);
mode->xfer32(result, tmp, n, NULL);
if (256 != scale) {
for (int i = 0; i < n; i++) {
result[i] = SkAlphaMulQ(result[i], scale);
}
}
result += n;
x += n;
count -= n;
} while (count > 0);
}
}