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/*
Copyright (C) 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
This file is part of the KDE project
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
aint 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.
*/
#include "config.h"
#if ENABLE(SVG)
#include "SVGPaintServerPattern.h"
#include "CgSupport.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include "RenderObject.h"
#include "SVGPatternElement.h"
namespace WebCore {
static void patternCallback(void* info, CGContextRef context)
{
ImageBuffer* patternImage = reinterpret_cast<ImageBuffer*>(info);
CGContextSaveGState(context);
CGContextTranslateCTM(context, 0, patternImage->size().height());
CGContextScaleCTM(context, 1.0f, -1.0f);
CGContextDrawImage(context, CGRect(FloatRect(FloatPoint(), patternImage->size())), patternImage->cgImage());
CGContextRestoreGState(context);
}
bool SVGPaintServerPattern::setup(GraphicsContext*& context, const RenderObject* object, SVGPaintTargetType type, bool isPaintingText) const
{
CGContextRef contextRef = context->platformContext();
// Build pattern tile, passing destination object bounding box
FloatRect targetRect;
if (isPaintingText) {
IntRect textBoundary = const_cast<RenderObject*>(object)->absoluteBoundingBoxRect();
targetRect = object->absoluteTransform().inverse().mapRect(textBoundary);
} else
targetRect = object->relativeBBox(false);
m_ownerElement->buildPattern(targetRect);
if (!tile())
return false;
context->save();
// Respect local pattern transformation
context->concatCTM(patternTransform());
// Apply pattern space transformation
context->translate(patternBoundaries().x(), patternBoundaries().y());
// Crude hack to support overflow="visible".
// When the patternBoundaries() size is smaller than the actual tile() size, we run into a problem:
// Our tile contains content which is larger than the pattern cell size. We just draw the pattern
// "out of" cell boundaries, to draw the overflown content, instead of clipping it away. The uppermost
// cell doesn't include the overflown content of the cell right above it though -> that's why we're moving
// down the phase by a very small amount, so we're sure the "cell right above"'s overflown content gets drawn.
CGContextSetPatternPhase(contextRef, CGSizeMake(0.0f, -0.01f));
RenderStyle* style = object->style();
CGContextSetAlpha(contextRef, style->opacity());
CGPatternCallbacks callbacks = {0, patternCallback, 0};
ASSERT(!m_pattern);
m_pattern = CGPatternCreate(tile(),
CGRect(FloatRect(FloatPoint(), tile()->size())),
CGContextGetCTM(contextRef),
patternBoundaries().width(),
patternBoundaries().height(),
kCGPatternTilingConstantSpacing,
true, // has color
&callbacks);
if (!m_patternSpace)
m_patternSpace = CGColorSpaceCreatePattern(0);
if ((type & ApplyToFillTargetType) && style->svgStyle()->hasFill()) {
CGFloat alpha = style->svgStyle()->fillOpacity();
CGContextSetFillColorSpace(contextRef, m_patternSpace);
CGContextSetFillPattern(contextRef, m_pattern, &alpha);
if (isPaintingText)
context->setTextDrawingMode(cTextFill);
}
if ((type & ApplyToStrokeTargetType) && style->svgStyle()->hasStroke()) {
CGFloat alpha = style->svgStyle()->strokeOpacity();
CGContextSetStrokeColorSpace(contextRef, m_patternSpace);
CGContextSetStrokePattern(contextRef, m_pattern, &alpha);
applyStrokeStyleToContext(context, style, object);
if (isPaintingText)
context->setTextDrawingMode(cTextStroke);
}
return true;
}
void SVGPaintServerPattern::teardown(GraphicsContext*& context, const RenderObject*, SVGPaintTargetType, bool) const
{
CGPatternRelease(m_pattern);
m_pattern = 0;
context->restore();
}
} // namespace WebCore
#endif
// vim:ts=4:noet
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