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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>.
*
* 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.
*/
#ifndef SVGRenderingContext_h
#define SVGRenderingContext_h
#if ENABLE(SVG)
#include "ImageBuffer.h"
#include "PaintInfo.h"
namespace WebCore {
class AffineTransform;
class RenderObject;
class FloatRect;
class RenderSVGResourceFilter;
// SVGRenderingContext
class SVGRenderingContext {
public:
enum NeedsGraphicsContextSave {
SaveGraphicsContext,
DontSaveGraphicsContext,
};
// Does not start rendering.
SVGRenderingContext()
: m_renderingFlags(0)
, m_object(0)
, m_paintInfo(0)
, m_savedContext(0)
#if ENABLE(FILTERS)
, m_filter(0)
#endif
{
}
SVGRenderingContext(RenderObject* object, PaintInfo& paintinfo, NeedsGraphicsContextSave needsGraphicsContextSave = DontSaveGraphicsContext)
: m_renderingFlags(0)
, m_object(0)
, m_paintInfo(0)
, m_savedContext(0)
#if ENABLE(FILTERS)
, m_filter(0)
#endif
{
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(RenderObject*, PaintInfo&, NeedsGraphicsContextSave = DontSaveGraphicsContext);
bool isRenderingPrepared() const { return m_renderingFlags & RenderingPrepared; }
static bool createImageBuffer(const FloatRect& paintRect, const AffineTransform& absoluteTransform, OwnPtr<ImageBuffer>&, ColorSpace, RenderingMode);
// Patterns need a different float-to-integer coordinate mapping.
static bool createImageBufferForPattern(const FloatRect& absoluteTargetRect, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>&, ColorSpace, RenderingMode);
static void renderSubtreeToImageBuffer(ImageBuffer*, RenderObject*, const AffineTransform&);
static void clipToImageBuffer(GraphicsContext*, const AffineTransform& absoluteTransform, const FloatRect& targetRect, OwnPtr<ImageBuffer>&, bool safeToClear);
static float calculateScreenFontSizeScalingFactor(const RenderObject*);
static void calculateTransformationToOutermostCoordinateSystem(const RenderObject*, AffineTransform& absoluteTransform);
static IntSize clampedAbsoluteSize(const IntSize&);
static FloatRect clampedAbsoluteTargetRect(const FloatRect& absoluteTargetRect);
static void clear2DRotation(AffineTransform&);
static IntRect calculateImageBufferRect(const FloatRect& targetRect, const AffineTransform& absoluteTransform)
{
return enclosingIntRect(absoluteTransform.mapRect(targetRect));
}
// Support for the buffered-rendering hint.
bool bufferForeground(OwnPtr<ImageBuffer>&);
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,
EndShadowLayer = 1 << 3,
EndFilterLayer = 1 << 4,
PrepareToRenderSVGContentWasCalled = 1 << 5
};
// List of those flags which require actions during the destructor.
const static int ActionsNeeded = RestoreGraphicsContext | EndOpacityLayer | EndShadowLayer | EndFilterLayer;
int m_renderingFlags;
RenderObject* m_object;
PaintInfo* m_paintInfo;
GraphicsContext* m_savedContext;
IntRect m_savedPaintRect;
#if ENABLE(FILTERS)
RenderSVGResourceFilter* m_filter;
#endif
};
} // namespace WebCore
#endif // ENABLE(SVG)
#endif // SVGRenderingContext_h
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