103 lines
4.1 KiB
C++
103 lines
4.1 KiB
C++
/**
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* Copyright (C) 2007 Rob Buis <buis@kde.org>
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* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
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* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
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* Copyright (C) 2009 Google, Inc. All rights reserved.
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* Copyright (C) Research In Motion Limited 2010. All rights reserved.
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* Copyright (C) 2012 Zoltan Herczeg <zherczeg@webkit.org>.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include "ImageBuffer.h"
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#include "PaintInfo.h"
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namespace WebCore {
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class AffineTransform;
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class FloatRect;
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class RenderElement;
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class RenderObject;
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class RenderSVGResourceFilter;
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// SVGRenderingContext
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class SVGRenderingContext {
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public:
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enum NeedsGraphicsContextSave {
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SaveGraphicsContext,
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DontSaveGraphicsContext,
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};
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// Does not start rendering.
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SVGRenderingContext()
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{
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}
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SVGRenderingContext(RenderElement& object, PaintInfo& paintinfo, NeedsGraphicsContextSave needsGraphicsContextSave = DontSaveGraphicsContext)
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{
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prepareToRenderSVGContent(object, paintinfo, needsGraphicsContextSave);
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}
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// Automatically finishes context rendering.
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~SVGRenderingContext();
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// Used by all SVG renderers who apply clip/filter/etc. resources to the renderer content.
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void prepareToRenderSVGContent(RenderElement&, PaintInfo&, NeedsGraphicsContextSave = DontSaveGraphicsContext);
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bool isRenderingPrepared() const { return m_renderingFlags & RenderingPrepared; }
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static RefPtr<ImageBuffer> createImageBuffer(const FloatRect& targetRect, const AffineTransform& absoluteTransform, const DestinationColorSpace&, RenderingMode, const GraphicsContext* = nullptr);
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static RefPtr<ImageBuffer> createImageBuffer(const FloatRect& targetRect, const FloatRect& clampedRect, const DestinationColorSpace&, RenderingMode, const GraphicsContext* = nullptr);
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static void renderSubtreeToContext(GraphicsContext&, RenderElement&, const AffineTransform&);
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static void clipToImageBuffer(GraphicsContext&, const AffineTransform& absoluteTransform, const FloatRect& targetRect, RefPtr<ImageBuffer>&, bool safeToClear);
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static float calculateScreenFontSizeScalingFactor(const RenderObject&);
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static AffineTransform calculateTransformationToOutermostCoordinateSystem(const RenderObject&);
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static void clear2DRotation(AffineTransform&);
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static IntRect calculateImageBufferRect(const FloatRect& targetRect, const AffineTransform& absoluteTransform)
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{
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return enclosingIntRect(absoluteTransform.mapRect(targetRect));
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}
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// Support for the buffered-rendering hint.
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bool bufferForeground(RefPtr<ImageBuffer>&);
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private:
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// To properly revert partially successful initializtions in the destructor, we record all successful steps.
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enum RenderingFlags {
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RenderingPrepared = 1,
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RestoreGraphicsContext = 1 << 1,
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EndOpacityLayer = 1 << 2,
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EndFilterLayer = 1 << 3,
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PrepareToRenderSVGContentWasCalled = 1 << 4
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};
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// List of those flags which require actions during the destructor.
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static constexpr int ActionsNeeded = RestoreGraphicsContext | EndOpacityLayer | EndFilterLayer;
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RenderElement* m_renderer { nullptr };
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PaintInfo* m_paintInfo { nullptr };
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GraphicsContext* m_savedContext { nullptr };
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RenderSVGResourceFilter* m_filter { nullptr };
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LayoutRect m_savedPaintRect;
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int m_renderingFlags { 0 };
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};
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} // namespace WebCore
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