FilterPainter::FilterPainter(PaintLayer& layer, GraphicsContext* context, const LayoutPoint& offsetFromRoot, const ClipRect& clipRect, PaintLayerPaintingInfo& paintingInfo, PaintLayerFlags paintFlags,
LayoutRect& rootRelativeBounds, bool& rootRelativeBoundsComputed)
: m_filterInProgress(false)
, m_context(context)
, m_layoutObject(layer.layoutObject())
{
if (!layer.filterEffectBuilder() || !layer.paintsWithFilters())
return;
ASSERT(layer.filterInfo());
SkiaImageFilterBuilder builder;
RefPtrWillBeRawPtr<FilterEffect> lastEffect = layer.filterEffectBuilder()->lastEffect();
lastEffect->determineFilterPrimitiveSubregion(MapRectForward);
RefPtr<SkImageFilter> imageFilter = builder.build(lastEffect.get(), ColorSpaceDeviceRGB);
if (!imageFilter)
return;
if (!rootRelativeBoundsComputed) {
rootRelativeBounds = layer.physicalBoundingBoxIncludingReflectionAndStackingChildren(offsetFromRoot);
rootRelativeBoundsComputed = true;
}
// We'll handle clipping to the dirty rect before filter rasterization.
// Filter processing will automatically expand the clip rect and the offscreen to accommodate any filter outsets.
// FIXME: It is incorrect to just clip to the damageRect here once multiple fragments are involved.
// Subsequent code should not clip to the dirty rect, since we've already
// done it above, and doing it later will defeat the outsets.
paintingInfo.clipToDirtyRect = false;
if (clipRect.rect() != paintingInfo.paintDirtyRect || clipRect.hasRadius()) {
m_clipRecorder = adoptPtr(new LayerClipRecorder(*context, *layer.layoutObject(), DisplayItem::ClipLayerFilter, clipRect, &paintingInfo, LayoutPoint(), paintFlags));
}
ASSERT(m_layoutObject);
ASSERT(context->displayItemList());
if (!context->displayItemList()->displayItemConstructionIsDisabled()) {
FilterOperations filterOperations(layer.computeFilterOperations(m_layoutObject->styleRef()));
OwnPtr<WebFilterOperations> webFilterOperations = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
builder.buildFilterOperations(filterOperations, webFilterOperations.get());
// FIXME: It's possible to have empty WebFilterOperations here even
// though the SkImageFilter produced above is non-null, since the
// layer's FilterEffectBuilder can have a stale representation of
// the layer's filter. See crbug.com/502026.
if (webFilterOperations->isEmpty())
return;
context->displayItemList()->createAndAppend<BeginFilterDisplayItem>(*m_layoutObject, imageFilter, FloatRect(rootRelativeBounds), webFilterOperations.release());
}
m_filterInProgress = true;
}
