void FilterEffect::copyPremultipliedImage(Uint8ClampedArray* destination, const IntRect& rect)
{
ASSERT(hasResult());
if (!m_premultipliedImageResult) {
// We prefer a conversion from the image buffer.
if (m_imageBufferResult)
m_premultipliedImageResult = m_imageBufferResult->getPremultipliedImageData(IntRect(IntPoint(), m_absolutePaintRect.size()));
else {
IntSize inputSize(m_absolutePaintRect.size());
ASSERT(!ImageBuffer::sizeNeedsClamping(inputSize));
inputSize.scale(m_filter.filterScale());
m_premultipliedImageResult = Uint8ClampedArray::createUninitialized(inputSize.width() * inputSize.height() * 4);
unsigned char* sourceComponent = m_unmultipliedImageResult->data();
unsigned char* destinationComponent = m_premultipliedImageResult->data();
unsigned char* end = sourceComponent + (inputSize.width() * inputSize.height() * 4);
while (sourceComponent < end) {
int alpha = sourceComponent[3];
destinationComponent[0] = static_cast<int>(sourceComponent[0]) * alpha / 255;
destinationComponent[1] = static_cast<int>(sourceComponent[1]) * alpha / 255;
destinationComponent[2] = static_cast<int>(sourceComponent[2]) * alpha / 255;
destinationComponent[3] = alpha;
sourceComponent += 4;
destinationComponent += 4;
}
}
}
copyImageBytes(m_premultipliedImageResult.get(), destination, rect);
}
void FilterEffect::copyUnmultipliedImage(Uint8ClampedArray* destination, const IntRect& rect)
{
ASSERT(hasResult());
if (!m_unmultipliedImageResult) {
// We prefer a conversion from the image buffer.
if (m_imageBufferResult)
m_unmultipliedImageResult = m_imageBufferResult->getImageData(Unmultiplied, IntRect(IntPoint(), m_absolutePaintRect.size()));
else {
ASSERT(isFilterSizeValid(m_absolutePaintRect));
m_unmultipliedImageResult = Uint8ClampedArray::createUninitialized(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
unsigned char* sourceComponent = m_premultipliedImageResult->data();
unsigned char* destinationComponent = m_unmultipliedImageResult->data();
unsigned char* end = sourceComponent + (m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
while (sourceComponent < end) {
int alpha = sourceComponent[3];
if (alpha) {
destinationComponent[0] = static_cast<int>(sourceComponent[0]) * 255 / alpha;
destinationComponent[1] = static_cast<int>(sourceComponent[1]) * 255 / alpha;
destinationComponent[2] = static_cast<int>(sourceComponent[2]) * 255 / alpha;
} else {
destinationComponent[0] = 0;
destinationComponent[1] = 0;
destinationComponent[2] = 0;
}
destinationComponent[3] = alpha;
sourceComponent += 4;
destinationComponent += 4;
}
}
}
copyImageBytes(m_unmultipliedImageResult.get(), destination, rect);
}
