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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/paint/FilterPainter.h"
#include "core/paint/FilterEffectBuilder.h"
#include "core/paint/LayerClipRecorder.h"
#include "core/paint/PaintLayer.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "platform/graphics/GraphicsContext.h"
#include "platform/graphics/GraphicsLayer.h"
#include "platform/graphics/filters/FilterEffect.h"
#include "platform/graphics/filters/SkiaImageFilterBuilder.h"
#include "platform/graphics/paint/FilterDisplayItem.h"
#include "platform/graphics/paint/PaintController.h"
#include "public/platform/Platform.h"
#include "public/platform/WebCompositorSupport.h"
#include "public/platform/WebFilterOperations.h"
namespace blink {
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.paintsWithFilters())
return;
RefPtrWillBeRawPtr<FilterEffect> lastEffect = layer.lastFilterEffect();
if (!lastEffect)
return;
ASSERT(layer.filterInfo());
SkiaImageFilterBuilder builder;
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);
if (!context.paintController().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.paintController().createAndAppend<BeginFilterDisplayItem>(*m_layoutObject, imageFilter, FloatRect(rootRelativeBounds), webFilterOperations.release());
}
m_filterInProgress = true;
}
FilterPainter::~FilterPainter()
{
if (!m_filterInProgress)
return;
m_context.paintController().endItem<EndFilterDisplayItem>(*m_layoutObject);
}
} // namespace blink
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