SkPMColor SkPerlinNoiseShader::PerlinNoiseShaderContext::shade(
const SkPoint& point, StitchData& stitchData) const {
SkPoint newPoint;
fMatrix.mapPoints(&newPoint, &point, 1);
newPoint.fX = SkScalarRoundToScalar(newPoint.fX);
newPoint.fY = SkScalarRoundToScalar(newPoint.fY);
U8CPU rgba[4];
for (int channel = 3; channel >= 0; --channel) {
rgba[channel] = SkScalarFloorToInt(255 *
calculateTurbulenceValueForPoint(channel, stitchData, newPoint));
}
return SkPreMultiplyARGB(rgba[3], rgba[0], rgba[1], rgba[2]);
}
inline void FETurbulence::fillRegion(ByteArray* pixelArray, PaintingData& paintingData, int startY, int endY)
{
IntRect filterRegion = absolutePaintRect();
IntPoint point(0, filterRegion.y() + startY);
int indexOfPixelChannel = startY * (filterRegion.width() << 2);
int channel;
for (int y = startY; y < endY; ++y) {
point.setY(point.y() + 1);
point.setX(filterRegion.x());
for (int x = 0; x < filterRegion.width(); ++x) {
point.setX(point.x() + 1);
for (channel = 0; channel < 4; ++channel, ++indexOfPixelChannel)
pixelArray->set(indexOfPixelChannel, calculateTurbulenceValueForPoint(channel, paintingData, filter()->mapAbsolutePointToLocalPoint(point)));
}
}
}