SkImageFilter* CanvasRenderingContext2DState::getFilter(Element* styleResolutionHost, const Font& font, IntSize canvasSize) const
{
if (!m_filterValue)
return nullptr;
if (!m_resolvedFilter) {
RefPtr<ComputedStyle> filterStyle = ComputedStyle::create();
// Must set font in case the filter uses any font-relative units (em, ex)
filterStyle->setFont(font);
StyleResolverState resolverState(styleResolutionHost->document(), styleResolutionHost, filterStyle.get());
resolverState.setStyle(filterStyle);
StyleBuilder::applyProperty(CSSPropertyWebkitFilter, resolverState, m_filterValue.get());
RefPtrWillBeRawPtr<FilterEffectBuilder> filterEffectBuilder = FilterEffectBuilder::create();
// We can't reuse m_fillPaint and m_strokePaint for the filter, since these incorporate
// the global alpha, which isn't applicable here.
SkPaint fillPaintForFilter;
SkPaint strokePaintForFilter;
m_fillStyle->applyToPaint(fillPaintForFilter);
m_strokeStyle->applyToPaint(strokePaintForFilter);
fillPaintForFilter.setColor(m_fillStyle->paintColor());
strokePaintForFilter.setColor(m_strokeStyle->paintColor());
FloatSize floatCanvasSize(canvasSize);
const double effectiveZoom = 1.0; // Deliberately ignore zoom on the canvas element
filterEffectBuilder->build(styleResolutionHost, filterStyle->filter(), effectiveZoom, &floatCanvasSize, &fillPaintForFilter, &strokePaintForFilter);
SkiaImageFilterBuilder imageFilterBuilder;
RefPtrWillBeRawPtr<FilterEffect> lastEffect = filterEffectBuilder->lastEffect();
m_resolvedFilter = imageFilterBuilder.build(lastEffect.get(), ColorSpaceDeviceRGB);
}
return m_resolvedFilter.get();
}
SkImageFilter* CanvasRenderingContext2DState::getFilter(Element* styleResolutionHost, IntSize canvasSize, CanvasRenderingContext2D* context) const
{
if (!m_filterValue)
return nullptr;
// StyleResolverState cannot be used in frame-less documents.
if (!styleResolutionHost->document().frame())
return nullptr;
if (!m_resolvedFilter) {
RefPtr<ComputedStyle> filterStyle = ComputedStyle::create();
// Must set font in case the filter uses any font-relative units (em, ex)
filterStyle->setFont(m_fontForFilter);
StyleResolverState resolverState(styleResolutionHost->document(), styleResolutionHost, filterStyle.get());
resolverState.setStyle(filterStyle);
StyleBuilder::applyProperty(CSSPropertyFilter, resolverState, *m_filterValue);
resolverState.loadPendingResources();
FilterEffectBuilder* filterEffectBuilder = FilterEffectBuilder::create();
// We can't reuse m_fillPaint and m_strokePaint for the filter, since these incorporate
// the global alpha, which isn't applicable here.
SkPaint fillPaintForFilter;
SkPaint strokePaintForFilter;
m_fillStyle->applyToPaint(fillPaintForFilter);
m_strokeStyle->applyToPaint(strokePaintForFilter);
fillPaintForFilter.setColor(m_fillStyle->paintColor());
strokePaintForFilter.setColor(m_strokeStyle->paintColor());
FloatSize floatCanvasSize(canvasSize);
const double effectiveZoom = 1.0; // Deliberately ignore zoom on the canvas element
filterEffectBuilder->build(styleResolutionHost, filterStyle->filter(), effectiveZoom, &floatCanvasSize, &fillPaintForFilter, &strokePaintForFilter);
FilterEffect* lastEffect = filterEffectBuilder->lastEffect();
if (lastEffect) {
lastEffect->determineFilterPrimitiveSubregion();
}
m_resolvedFilter = SkiaImageFilterBuilder::build(lastEffect, ColorSpaceDeviceRGB);
if (m_resolvedFilter) {
updateFilterReferences(toHTMLCanvasElement(styleResolutionHost), context, filterStyle->filter());
if (lastEffect->originTainted())
context->setOriginTainted();
}
}
return m_resolvedFilter.get();
}
