void FEMorphology::platformApplyGeneric(PaintingData* paintingData, int yStart, int yEnd)
{
Uint8ClampedArray* srcPixelArray = paintingData->srcPixelArray;
Uint8ClampedArray* dstPixelArray = paintingData->dstPixelArray;
const int width = paintingData->width;
const int height = paintingData->height;
const int effectWidth = width * 4;
const int radiusX = paintingData->radiusX;
const int radiusY = paintingData->radiusY;
Vector<unsigned char> extrema;
for (int y = yStart; y < yEnd; ++y) {
int extremaStartY = std::max(0, y - radiusY);
int extremaEndY = std::min(height - 1, y + radiusY);
for (unsigned int clrChannel = 0; clrChannel < 4; ++clrChannel) {
extrema.clear();
// Compute extremas for each columns
for (int x = 0; x <= radiusX; ++x) {
unsigned char columnExtrema = srcPixelArray->item(extremaStartY * effectWidth + 4 * x + clrChannel);
for (int eY = extremaStartY + 1; eY < extremaEndY; ++eY) {
unsigned char pixel = srcPixelArray->item(eY * effectWidth + 4 * x + clrChannel);
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 < width; ++x) {
const int endX = std::min(x + radiusX, width - 1);
unsigned char columnExtrema = srcPixelArray->item(extremaStartY * effectWidth + endX * 4 + clrChannel);
for (int i = extremaStartY + 1; i <= extremaEndY; ++i) {
unsigned char pixel = srcPixelArray->item(i * effectWidth + endX * 4 + clrChannel);
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 <= width)
extrema.append(columnExtrema);
unsigned char entireExtrema = extrema[0];
for (unsigned kernelIndex = 1; kernelIndex < extrema.size(); ++kernelIndex) {
if ((m_type == FEMORPHOLOGY_OPERATOR_ERODE && extrema[kernelIndex] <= entireExtrema)
|| (m_type == FEMORPHOLOGY_OPERATOR_DILATE && extrema[kernelIndex] >= entireExtrema))
entireExtrema = extrema[kernelIndex];
}
dstPixelArray->set(y * effectWidth + 4 * x + clrChannel, entireExtrema);
}
}
}
}
void FEComponentTransfer::platformApplySoftware()
{
FilterEffect* in = inputEffect(0);
Uint8ClampedArray* pixelArray = createUnmultipliedImageResult();
if (!pixelArray)
return;
unsigned char rValues[256], gValues[256], bValues[256], aValues[256];
getValues(rValues, gValues, bValues, aValues);
unsigned char* tables[] = { rValues, gValues, bValues, aValues };
IntRect drawingRect = requestedRegionOfInputImageData(in->absolutePaintRect());
in->copyUnmultipliedImage(pixelArray, drawingRect);
unsigned pixelArrayLength = pixelArray->length();
for (unsigned pixelOffset = 0; pixelOffset < pixelArrayLength; pixelOffset += 4) {
for (unsigned channel = 0; channel < 4; ++channel) {
unsigned char c = pixelArray->item(pixelOffset + channel);
pixelArray->set(pixelOffset + channel, tables[channel][c]);
}
}
}