static inline void clipToTextMask(GraphicsContext* context,
OwnPtr<ImageBuffer>& imageBuffer, const RenderObject* object,
const SVGPaintServerGradient* gradientServer)
{
FloatRect maskBBox = const_cast<RenderObject*>(findTextRootObject(object))->relativeBBox(false);
// Fixup transformations to be able to clip to mask
TransformationMatrix transform = object->absoluteTransform();
FloatRect textBoundary = transform.mapRect(maskBBox);
IntSize maskSize(lroundf(textBoundary.width()), lroundf(textBoundary.height()));
clampImageBufferSizeToViewport(object->document()->renderer(), maskSize);
textBoundary.setSize(textBoundary.size().shrunkTo(maskSize));
// Clip current context to mask image (gradient)
context->concatCTM(transform.inverse());
context->clipToImageBuffer(textBoundary, imageBuffer.get());
context->concatCTM(transform);
if (gradientServer->boundingBoxMode()) {
context->translate(maskBBox.x(), maskBBox.y());
context->scale(FloatSize(maskBBox.width(), maskBBox.height()));
}
context->concatCTM(gradientServer->gradientTransform());
}
static inline bool createMaskAndSwapContextForTextGradient(
GraphicsContext*& context, GraphicsContext*& savedContext,
OwnPtr<ImageBuffer>& imageBuffer, const RenderObject* object)
{
FloatRect maskBBox = const_cast<RenderObject*>(findTextRootObject(object))->relativeBBox(false);
IntRect maskRect = enclosingIntRect(object->absoluteTransform().mapRect(maskBBox));
IntSize maskSize(maskRect.width(), maskRect.height());
clampImageBufferSizeToViewport(object->document()->renderer(), maskSize);
auto_ptr<ImageBuffer> maskImage = ImageBuffer::create(maskSize, false);
if (!maskImage.get())
return false;
GraphicsContext* maskImageContext = maskImage->context();
maskImageContext->save();
maskImageContext->translate(-maskRect.x(), -maskRect.y());
maskImageContext->concatCTM(object->absoluteTransform());
imageBuffer.set(maskImage.release());
savedContext = context;
context = maskImageContext;
return true;
}
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;
// Allocate an image buffer as big as the absolute unclipped size of the object
OwnPtr<ImageBuffer> maskImage = ImageBuffer::create(maskImageRect.size());
if (!maskImage)
return false;
GraphicsContext* maskImageContext = maskImage->context();
// Transform the mask image coordinate system to absolute screen coordinates
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;
}
bool RenderSVGResourceGradient::applyResource(RenderObject* object, RenderStyle* style, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(object);
ASSERT(style);
ASSERT(context);
ASSERT(resourceMode != ApplyToDefaultMode);
// Be sure to synchronize all SVG properties on the gradientElement _before_ processing any further.
// Otherwhise the call to collectGradientAttributes() in createTileImage(), may cause the SVG DOM property
// synchronization to kick in, which causes invalidateClients() to be called, which in turn deletes our
// GradientData object! Leaving out the line below will cause svg/dynamic-updates/SVG*GradientElement-svgdom* to crash.
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);
// Create gradient object
if (!gradientData->gradient)
buildGradient(gradientData, gradientElement);
if (!gradientData->gradient)
return false;
// Draw gradient
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;
// CG platforms will handle the gradient space transform for text after applying the
// resource, so don't apply it here. For non-CG platforms, we want the text bounding
// box applied to the gradient space transform now, so the gradient shader can use it.
#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)
// CG requires special handling for gradient on text
if (m_savedContext && m_gradient.contains(object)) {
GradientData* gradientData = m_gradient.get(object);
// Restore on-screen drawing context
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();
}