RenderSVGResourceGradient.cpp [plain text]
#include "config.h"
#if ENABLE(SVG)
#include "RenderSVGResourceGradient.h"
#include "GradientAttributes.h"
#include "GraphicsContext.h"
#include "SVGRenderSupport.h"
#include <wtf/UnusedParam.h>
namespace WebCore {
RenderSVGResourceGradient::RenderSVGResourceGradient(SVGGradientElement* node)
: RenderSVGResourceContainer(node)
#if PLATFORM(CG)
, m_savedContext(0)
#endif
{
}
RenderSVGResourceGradient::~RenderSVGResourceGradient()
{
deleteAllValues(m_gradient);
m_gradient.clear();
}
void RenderSVGResourceGradient::invalidateClients()
{
const HashMap<RenderObject*, GradientData*>::const_iterator end = m_gradient.end();
for (HashMap<RenderObject*, GradientData*>::const_iterator it = m_gradient.begin(); it != end; ++it)
markForLayoutAndResourceInvalidation(it->first);
deleteAllValues(m_gradient);
m_gradient.clear();
}
void RenderSVGResourceGradient::invalidateClient(RenderObject* object)
{
ASSERT(object);
if (!m_gradient.contains(object))
return;
delete m_gradient.take(object);
markForLayoutAndResourceInvalidation(object);
}
#if PLATFORM(CG)
static inline AffineTransform absoluteTransformForRenderer(const RenderObject* object)
{
AffineTransform absoluteTransform;
const RenderObject* currentObject = object;
while (currentObject) {
absoluteTransform = currentObject->localToParentTransform() * absoluteTransform;
currentObject = currentObject->parent();
}
return absoluteTransform;
}
static inline bool createMaskAndSwapContextForTextGradient(GraphicsContext*& context,
GraphicsContext*& savedContext,
OwnPtr<ImageBuffer>& imageBuffer,
const RenderObject* object)
{
const RenderObject* textRootBlock = findTextRootObject(object);
AffineTransform transform = absoluteTransformForRenderer(textRootBlock);
FloatRect maskAbsoluteBoundingBox = transform.mapRect(textRootBlock->repaintRectInLocalCoordinates());
IntRect maskImageRect = enclosingIntRect(maskAbsoluteBoundingBox);
if (maskImageRect.isEmpty())
return false;
OwnPtr<ImageBuffer> maskImage = ImageBuffer::create(maskImageRect.size());
if (!maskImage)
return false;
GraphicsContext* maskImageContext = maskImage->context();
maskImageContext->translate(-maskAbsoluteBoundingBox.x(), -maskAbsoluteBoundingBox.y());
maskImageContext->concatCTM(transform);
imageBuffer.set(maskImage.release());
savedContext = context;
context = maskImageContext;
return true;
}
static inline AffineTransform clipToTextMask(GraphicsContext* context,
OwnPtr<ImageBuffer>& imageBuffer,
const RenderObject* object,
GradientData* gradientData)
{
const RenderObject* textRootBlock = findTextRootObject(object);
context->clipToImageBuffer(textRootBlock->repaintRectInLocalCoordinates(), imageBuffer.get());
AffineTransform matrix;
if (gradientData->boundingBoxMode) {
FloatRect maskBoundingBox = textRootBlock->objectBoundingBox();
matrix.translate(maskBoundingBox.x(), maskBoundingBox.y());
matrix.scaleNonUniform(maskBoundingBox.width(), maskBoundingBox.height());
}
matrix.multiply(gradientData->transform);
return matrix;
}
#endif
bool RenderSVGResourceGradient::applyResource(RenderObject* object, RenderStyle* style, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(object);
ASSERT(style);
ASSERT(context);
ASSERT(resourceMode != ApplyToDefaultMode);
SVGGradientElement* gradientElement = static_cast<SVGGradientElement*>(node());
if (!gradientElement)
return false;
gradientElement->updateAnimatedSVGAttribute(anyQName());
if (!m_gradient.contains(object))
m_gradient.set(object, new GradientData);
GradientData* gradientData = m_gradient.get(object);
if (!gradientData->gradient)
buildGradient(gradientData, gradientElement);
if (!gradientData->gradient)
return false;
context->save();
bool isPaintingText = resourceMode & ApplyToTextMode;
if (isPaintingText) {
#if PLATFORM(CG)
if (!createMaskAndSwapContextForTextGradient(context, m_savedContext, m_imageBuffer, object)) {
context->restore();
return false;
}
#endif
context->setTextDrawingMode(resourceMode & ApplyToFillMode ? cTextFill : cTextStroke);
}
AffineTransform transform;
#if PLATFORM(CG)
if (gradientData->boundingBoxMode && !isPaintingText) {
#else
if (gradientData->boundingBoxMode) {
#endif
FloatRect objectBoundingBox = object->objectBoundingBox();
transform.translate(objectBoundingBox.x(), objectBoundingBox.y());
transform.scaleNonUniform(objectBoundingBox.width(), objectBoundingBox.height());
}
transform.multiply(gradientData->transform);
gradientData->gradient->setGradientSpaceTransform(transform);
const SVGRenderStyle* svgStyle = style->svgStyle();
ASSERT(svgStyle);
if (resourceMode & ApplyToFillMode) {
context->setAlpha(svgStyle->fillOpacity());
context->setFillGradient(gradientData->gradient);
context->setFillRule(svgStyle->fillRule());
} else if (resourceMode & ApplyToStrokeMode) {
context->setAlpha(svgStyle->strokeOpacity());
context->setStrokeGradient(gradientData->gradient);
applyStrokeStyleToContext(context, style, object);
}
return true;
}
void RenderSVGResourceGradient::postApplyResource(RenderObject* object, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(context);
ASSERT(resourceMode != ApplyToDefaultMode);
if (resourceMode & ApplyToTextMode) {
#if PLATFORM(CG)
if (m_savedContext && m_gradient.contains(object)) {
GradientData* gradientData = m_gradient.get(object);
context = m_savedContext;
m_savedContext = 0;
gradientData->gradient->setGradientSpaceTransform(clipToTextMask(context, m_imageBuffer, object, gradientData));
context->setFillGradient(gradientData->gradient);
const RenderObject* textRootBlock = findTextRootObject(object);
context->fillRect(textRootBlock->repaintRectInLocalCoordinates());
m_imageBuffer.clear();
}
#else
UNUSED_PARAM(object);
#endif
} else {
if (resourceMode & ApplyToFillMode)
context->fillPath();
else if (resourceMode & ApplyToStrokeMode)
context->strokePath();
}
context->restore();
}
void RenderSVGResourceGradient::addStops(GradientData* gradientData, const Vector<Gradient::ColorStop>& stops) const
{
ASSERT(gradientData->gradient);
const Vector<Gradient::ColorStop>::const_iterator end = stops.end();
for (Vector<Gradient::ColorStop>::const_iterator it = stops.begin(); it != end; ++it)
gradientData->gradient->addColorStop(*it);
}
}
#endif