void FEComposite::apply(Filter* filter)
{
m_in->apply(filter);
m_in2->apply(filter);
if (!m_in->resultImage() || !m_in2->resultImage())
return;
GraphicsContext* filterContext = getEffectContext();
if (!filterContext)
return;
FloatRect srcRect = FloatRect(0.f, 0.f, -1.f, -1.f);
switch (m_type) {
case FECOMPOSITE_OPERATOR_OVER:
filterContext->drawImageBuffer(m_in2->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in2->scaledSubRegion()));
filterContext->drawImageBuffer(m_in->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in->scaledSubRegion()));
break;
case FECOMPOSITE_OPERATOR_IN:
filterContext->save();
filterContext->clipToImageBuffer(m_in2->resultImage(), calculateDrawingRect(m_in2->scaledSubRegion()));
filterContext->drawImageBuffer(m_in->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in->scaledSubRegion()));
filterContext->restore();
break;
case FECOMPOSITE_OPERATOR_OUT:
filterContext->drawImageBuffer(m_in->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in->scaledSubRegion()));
filterContext->drawImageBuffer(m_in2->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in2->scaledSubRegion()), srcRect, CompositeDestinationOut);
break;
case FECOMPOSITE_OPERATOR_ATOP:
filterContext->drawImageBuffer(m_in2->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in2->scaledSubRegion()));
filterContext->drawImageBuffer(m_in->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in->scaledSubRegion()), srcRect, CompositeSourceAtop);
break;
case FECOMPOSITE_OPERATOR_XOR:
filterContext->drawImageBuffer(m_in2->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in2->scaledSubRegion()));
filterContext->drawImageBuffer(m_in->resultImage(), DeviceColorSpace, calculateDrawingRect(m_in->scaledSubRegion()), srcRect, CompositeXOR);
break;
case FECOMPOSITE_OPERATOR_ARITHMETIC: {
IntRect effectADrawingRect = calculateDrawingIntRect(m_in->scaledSubRegion());
RefPtr<CanvasPixelArray> srcPixelArrayA(m_in->resultImage()->getPremultipliedImageData(effectADrawingRect)->data());
IntRect effectBDrawingRect = calculateDrawingIntRect(m_in2->scaledSubRegion());
RefPtr<ImageData> imageData(m_in2->resultImage()->getPremultipliedImageData(effectBDrawingRect));
CanvasPixelArray* srcPixelArrayB(imageData->data());
arithmetic(srcPixelArrayA, srcPixelArrayB, m_k1, m_k2, m_k3, m_k4);
resultImage()->putPremultipliedImageData(imageData.get(), IntRect(IntPoint(), resultImage()->size()), IntPoint());
}
break;
default:
break;
}
}
void FEDisplacementMap::apply(Filter* filter)
{
m_in->apply(filter);
m_in2->apply(filter);
if (!m_in->resultImage() || !m_in2->resultImage())
return;
if (m_xChannelSelector == CHANNEL_UNKNOWN || m_yChannelSelector == CHANNEL_UNKNOWN)
return;
if (!getEffectContext())
return;
IntRect effectADrawingRect = calculateDrawingIntRect(m_in->scaledSubRegion());
RefPtr<CanvasPixelArray> srcPixelArrayA(m_in->resultImage()->getPremultipliedImageData(effectADrawingRect)->data());
IntRect effectBDrawingRect = calculateDrawingIntRect(m_in2->scaledSubRegion());
RefPtr<CanvasPixelArray> srcPixelArrayB(m_in2->resultImage()->getUnmultipliedImageData(effectBDrawingRect)->data());
IntRect imageRect(IntPoint(), resultImage()->size());
RefPtr<ImageData> imageData = ImageData::create(imageRect.width(), imageRect.height());
ASSERT(srcPixelArrayA->length() == srcPixelArrayB->length());
float scaleX = m_scale / 255.f * filter->filterResolution().width();
float scaleY = m_scale / 255.f * filter->filterResolution().height();
float scaleAdjustmentX = (0.5f - 0.5f * m_scale) * filter->filterResolution().width();
float scaleAdjustmentY = (0.5f - 0.5f * m_scale) * filter->filterResolution().height();
int stride = imageRect.width() * 4;
for (int y = 0; y < imageRect.height(); ++y) {
int line = y * stride;
for (int x = 0; x < imageRect.width(); ++x) {
int dstIndex = line + x * 4;
int srcX = x + static_cast<int>(scaleX * srcPixelArrayB->get(dstIndex + m_xChannelSelector - 1) + scaleAdjustmentX);
int srcY = y + static_cast<int>(scaleY * srcPixelArrayB->get(dstIndex + m_yChannelSelector - 1) + scaleAdjustmentY);
for (unsigned channel = 0; channel < 4; ++channel) {
if (srcX < 0 || srcX >= imageRect.width() || srcY < 0 || srcY >= imageRect.height())
imageData->data()->set(dstIndex + channel, static_cast<unsigned char>(0));
else {
unsigned char pixelValue = srcPixelArrayA->get(srcY * stride + srcX * 4 + channel);
imageData->data()->set(dstIndex + channel, pixelValue);
}
}
}
}
resultImage()->putPremultipliedImageData(imageData.get(), imageRect, IntPoint());
}
void FEGaussianBlur::apply(Filter* filter)
{
m_in->apply(filter);
if (!m_in->resultImage())
return;
if (!getEffectContext())
return;
setIsAlphaImage(m_in->isAlphaImage());
if (m_x == 0 || m_y == 0)
return;
unsigned sdx = static_cast<unsigned>(floor(m_x * 3 * sqrt(2 * M_PI) / 4.f + 0.5f));
unsigned sdy = static_cast<unsigned>(floor(m_y * 3 * sqrt(2 * M_PI) / 4.f + 0.5f));
IntRect effectDrawingRect = calculateDrawingIntRect(m_in->subRegion());
RefPtr<ImageData> srcImageData(m_in->resultImage()->getPremultipliedImageData(effectDrawingRect));
CanvasPixelArray* srcPixelArray(srcImageData->data());
IntRect imageRect(IntPoint(), resultImage()->size());
RefPtr<ImageData> tmpImageData = ImageData::create(imageRect.width(), imageRect.height());
CanvasPixelArray* tmpPixelArray(tmpImageData->data());
int stride = 4 * imageRect.width();
for (int i = 0; i < 3; ++i) {
boxBlur(srcPixelArray, tmpPixelArray, sdx, 4, stride, imageRect.width(), imageRect.height(), isAlphaImage());
boxBlur(tmpPixelArray, srcPixelArray, sdy, stride, 4, imageRect.height(), imageRect.width(), isAlphaImage());
}
resultImage()->putPremultipliedImageData(srcImageData.get(), imageRect, IntPoint());
}
void FEBlend::apply(Filter* filter)
{
m_in->apply(filter);
m_in2->apply(filter);
if (!m_in->resultImage() || !m_in2->resultImage())
return;
if (m_mode == FEBLEND_MODE_UNKNOWN)
return;
if (!getEffectContext())
return;
IntRect effectADrawingRect = calculateDrawingIntRect(m_in->scaledSubRegion());
RefPtr<CanvasPixelArray> srcPixelArrayA(m_in->resultImage()->getPremultipliedImageData(effectADrawingRect)->data());
IntRect effectBDrawingRect = calculateDrawingIntRect(m_in2->scaledSubRegion());
RefPtr<CanvasPixelArray> srcPixelArrayB(m_in2->resultImage()->getPremultipliedImageData(effectBDrawingRect)->data());
IntRect imageRect(IntPoint(), resultImage()->size());
RefPtr<ImageData> imageData = ImageData::create(imageRect.width(), imageRect.height());
// Keep synchronized with BlendModeType
static const BlendType callEffect[] = {unknown, normal, multiply, screen, darken, lighten};
ASSERT(srcPixelArrayA->length() == srcPixelArrayB->length());
for (unsigned pixelOffset = 0; pixelOffset < srcPixelArrayA->length(); pixelOffset += 4) {
unsigned char alphaA = srcPixelArrayA->get(pixelOffset + 3);
unsigned char alphaB = srcPixelArrayB->get(pixelOffset + 3);
for (unsigned channel = 0; channel < 3; ++channel) {
unsigned char colorA = srcPixelArrayA->get(pixelOffset + channel);
unsigned char colorB = srcPixelArrayB->get(pixelOffset + channel);
unsigned char result = (*callEffect[m_mode])(colorA, colorB, alphaA, alphaB);
imageData->data()->set(pixelOffset + channel, result);
}
unsigned char alphaR = 255 - ((255 - alphaA) * (255 - alphaB)) / 255;
imageData->data()->set(pixelOffset + 3, alphaR);
}
resultImage()->putPremultipliedImageData(imageData.get(), imageRect, IntPoint());
}
void FELighting::apply(Filter* filter)
{
m_in->apply(filter);
if (!m_in->resultImage())
return;
if (!getEffectContext())
return;
setIsAlphaImage(false);
IntRect effectDrawingRect = calculateDrawingIntRect(m_in->scaledSubRegion());
RefPtr<ImageData> srcImageData(m_in->resultImage()->getUnmultipliedImageData(effectDrawingRect));
CanvasPixelArray* srcPixelArray(srcImageData->data());
// FIXME: support kernelUnitLengths other than (1,1). The issue here is that the W3
// standard has no test case for them, and other browsers (like Firefox) has strange
// output for various kernelUnitLengths, and I am not sure they are reliable.
// Anyway, feConvolveMatrix should also use the implementation
if (drawLighting(srcPixelArray, effectDrawingRect.width(), effectDrawingRect.height()))
resultImage()->putUnmultipliedImageData(srcImageData.get(), IntRect(IntPoint(), resultImage()->size()), IntPoint());
}
void FEMorphology::apply(Filter* filter)
{
m_in->apply(filter);
if (!m_in->resultImage())
return;
if (!getEffectContext())
return;
setIsAlphaImage(m_in->isAlphaImage());
int radiusX = static_cast<int>(m_radiusX * filter->filterResolution().width());
int radiusY = static_cast<int>(m_radiusY * filter->filterResolution().height());
if (radiusX <= 0 || radiusY <= 0)
return;
IntRect imageRect(IntPoint(), resultImage()->size());
IntRect effectDrawingRect = calculateDrawingIntRect(m_in->scaledSubRegion());
RefPtr<CanvasPixelArray> srcPixelArray(m_in->resultImage()->getPremultipliedImageData(effectDrawingRect)->data());
RefPtr<ImageData> imageData = ImageData::create(imageRect.width(), imageRect.height());
int effectWidth = effectDrawingRect.width() * 4;
// Limit the radius size to effect dimensions
radiusX = min(effectDrawingRect.width() - 1, radiusX);
radiusY = min(effectDrawingRect.height() - 1, radiusY);
Vector<unsigned char> extrema;
for (int y = 0; y < effectDrawingRect.height(); ++y) {
int startY = max(0, y - radiusY);
int endY = min(effectDrawingRect.height() - 1, y + radiusY);
for (unsigned channel = 0; channel < 4; ++channel) {
// Fill the kernel
extrema.clear();
for (int j = 0; j <= radiusX; ++j) {
unsigned char columnExtrema = srcPixelArray->get(startY * effectWidth + 4 * j + channel);
for (int i = startY; i <= endY; ++i) {
unsigned char pixel = srcPixelArray->get(i * effectWidth + 4 * j + channel);
if ((m_type == FEMORPHOLOGY_OPERATOR_ERODE && pixel <= columnExtrema) ||
(m_type == FEMORPHOLOGY_OPERATOR_DILATE && pixel >= columnExtrema))
columnExtrema = pixel;
}
extrema.append(columnExtrema);
}
// Kernel is filled, get extrema of next column
for (int x = 0; x < effectDrawingRect.width(); ++x) {
unsigned endX = min(x + radiusX, effectDrawingRect.width() - 1);
unsigned char columnExtrema = srcPixelArray->get(startY * effectWidth + endX * 4 + channel);
for (int i = startY; i <= endY; ++i) {
unsigned char pixel = srcPixelArray->get(i * effectWidth + endX * 4 + channel);
if ((m_type == FEMORPHOLOGY_OPERATOR_ERODE && pixel <= columnExtrema) ||
(m_type == FEMORPHOLOGY_OPERATOR_DILATE && pixel >= columnExtrema))
columnExtrema = pixel;
}
if (x - radiusX >= 0)
extrema.remove(0);
if (x + radiusX <= effectDrawingRect.width())
extrema.append(columnExtrema);
unsigned char entireExtrema = extrema[0];
for (unsigned kernelIndex = 0; kernelIndex < extrema.size(); ++kernelIndex) {
if ((m_type == FEMORPHOLOGY_OPERATOR_ERODE && extrema[kernelIndex] <= entireExtrema) ||
(m_type == FEMORPHOLOGY_OPERATOR_DILATE && extrema[kernelIndex] >= entireExtrema))
entireExtrema = extrema[kernelIndex];
}
imageData->data()->set(y * effectWidth + 4 * x + channel, entireExtrema);
}
}
}
resultImage()->putPremultipliedImageData(imageData.get(), imageRect, IntPoint());
}
