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/*
* Copyright (C) 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2012 Zoltan Herczeg <zherczeg@webkit.org>.
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include "ImageBuffer.h"
#include "PaintInfo.h"
namespace WebCore {
class AffineTransform;
class FloatRect;
class RenderElement;
class RenderObject;
class LegacyRenderSVGResourceFilter;
class SVGRenderingContext {
public:
enum NeedsGraphicsContextSave {
SaveGraphicsContext,
DontSaveGraphicsContext,
};
// Does not start rendering.
SVGRenderingContext()
{
}
SVGRenderingContext(SVGRenderingContext&&);
SVGRenderingContext(const SVGRenderingContext&) = delete;
SVGRenderingContext(RenderElement& object, PaintInfo& paintinfo, NeedsGraphicsContextSave needsGraphicsContextSave = DontSaveGraphicsContext)
{
prepareToRenderSVGContent(object, paintinfo, needsGraphicsContextSave);
}
// Automatically finishes context rendering.
~SVGRenderingContext();
// Used by all SVG renderers who apply clip/filter/etc. resources to the renderer content.
void prepareToRenderSVGContent(RenderElement&, PaintInfo&, NeedsGraphicsContextSave = DontSaveGraphicsContext);
bool isRenderingPrepared() const { return m_renderingFlags & RenderingPrepared; }
bool pathClippingIsEntirelyWithinRendererContents() const { return m_pathClippingIsEntirelyWithinRendererContents; }
static void renderSubtreeToContext(GraphicsContext&, RenderElement&, const AffineTransform&);
static void clipToImageBuffer(GraphicsContext&, const FloatRect& targetRect, const FloatSize& scale, RefPtr<ImageBuffer>&, bool safeToClear);
static float calculateScreenFontSizeScalingFactor(const RenderObject&);
static AffineTransform calculateTransformationToOutermostCoordinateSystem(const RenderObject&);
static IntRect calculateImageBufferRect(const FloatRect& targetRect, const AffineTransform& absoluteTransform)
{
return enclosingIntRect(absoluteTransform.mapRect(targetRect));
}
// Support for the buffered-rendering hint.
bool bufferForeground(RefPtr<ImageBuffer>&);
const RenderElement* renderer() const { return m_renderer; }
private:
// To properly revert partially successful initializtions in the destructor, we record all successful steps.
enum RenderingFlags {
RenderingPrepared = 1,
RestoreGraphicsContext = 1 << 1,
EndOpacityLayer = 1 << 2,
EndFilterLayer = 1 << 3,
PrepareToRenderSVGContentWasCalled = 1 << 4
};
// List of those flags which require actions during the destructor.
static constexpr int ActionsNeeded = RestoreGraphicsContext | EndOpacityLayer | EndFilterLayer;
RenderElement* m_renderer { nullptr };
PaintInfo* m_paintInfo { nullptr };
GraphicsContext* m_savedContext { nullptr };
LegacyRenderSVGResourceFilter* m_filter { nullptr };
LayoutRect m_savedPaintRect;
int m_renderingFlags { 0 };
// True with path-based clipping is known to contrain the clipped area to within the renderer; used to optimize away a context clip.
bool m_pathClippingIsEntirelyWithinRendererContents { false };
};
} // namespace WebCore
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