void CrossfadeGeneratedImage::drawCrossfade(
SkCanvas* canvas,
const SkPaint& paint,
ImageClampingMode clampMode,
const ColorBehavior& colorBehavior) {
FloatRect fromImageRect(FloatPoint(), FloatSize(m_fromImage->size()));
FloatRect toImageRect(FloatPoint(), FloatSize(m_toImage->size()));
FloatRect destRect((FloatPoint()), FloatSize(m_crossfadeSize));
// TODO(junov): The various effects encoded into paint should probably be
// applied here instead of inside the layer. This probably faulty behavior
// was maintained in order to preserve pre-existing behavior while refactoring
// this code. This should be investigated further. crbug.com/472634
SkPaint layerPaint;
layerPaint.setBlendMode(paint.getBlendMode());
SkAutoCanvasRestore ar(canvas, false);
canvas->saveLayer(nullptr, &layerPaint);
SkPaint imagePaint(paint);
imagePaint.setBlendMode(SkBlendMode::kSrcOver);
int imageAlpha = clampedAlphaForBlending(1 - m_percentage);
imagePaint.setAlpha(imageAlpha > 255 ? 255 : imageAlpha);
imagePaint.setAntiAlias(paint.isAntiAlias());
// TODO(junov): This code should probably be propagating the
// RespectImageOrientationEnum from CrossfadeGeneratedImage::draw(). Code was
// written this way during refactoring to avoid modifying existing behavior,
// but this warrants further investigation. crbug.com/472634
m_fromImage->draw(canvas, imagePaint, destRect, fromImageRect,
DoNotRespectImageOrientation, clampMode, colorBehavior);
imagePaint.setBlendMode(SkBlendMode::kPlus);
imageAlpha = clampedAlphaForBlending(m_percentage);
imagePaint.setAlpha(imageAlpha > 255 ? 255 : imageAlpha);
m_toImage->draw(canvas, imagePaint, destRect, toImageRect,
DoNotRespectImageOrientation, clampMode, colorBehavior);
}
void CanvasRenderingContext2DState::setGlobalAlpha(double alpha) {
m_globalAlpha = alpha;
m_strokeStyleDirty = true;
m_fillStyleDirty = true;
int imageAlpha = clampedAlphaForBlending(alpha);
m_imagePaint.setAlpha(imageAlpha > 255 ? 255 : imageAlpha);
}
void CanvasRenderingContext2DState::updateFillStyle() const {
if (!m_fillStyleDirty)
return;
int clampedAlpha = clampedAlphaForBlending(m_globalAlpha);
ASSERT(m_fillStyle);
m_fillStyle->applyToPaint(m_fillPaint);
m_fillPaint.setColor(scaleAlpha(m_fillStyle->paintColor(), clampedAlpha));
m_fillStyleDirty = false;
}
void CanvasRenderingContext2DState::updateStrokeStyle() const
{
if (!m_strokeStyleDirty)
return;
int clampedAlpha = clampedAlphaForBlending(m_globalAlpha);
ASSERT(m_strokeStyle);
m_strokePaint.setShader(m_strokeStyle->shader());
m_strokePaint.setColor(scaleAlpha(m_strokeStyle->paintColor(), clampedAlpha));
m_strokeStyleDirty = false;
}
SkColor scaleAlpha(SkColor color, float alpha)
{
return scaleAlpha(color, clampedAlphaForBlending(alpha));
}