PassOwnPtr<ImageBuffer> SVGMaskElement::drawMaskerContent(const FloatRect& targetRect, FloatRect& maskDestRect) const
{
// Determine specified mask size
float xValue;
float yValue;
float widthValue;
float heightValue;
if (maskUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
xValue = x().valueAsPercentage() * targetRect.width();
yValue = y().valueAsPercentage() * targetRect.height();
widthValue = width().valueAsPercentage() * targetRect.width();
heightValue = height().valueAsPercentage() * targetRect.height();
} else {
xValue = x().value(this);
yValue = y().value(this);
widthValue = width().value(this);
heightValue = height().value(this);
}
IntSize imageSize(lroundf(widthValue), lroundf(heightValue));
clampImageBufferSizeToViewport(document()->view(), imageSize);
if (imageSize.width() < static_cast<int>(widthValue))
widthValue = imageSize.width();
if (imageSize.height() < static_cast<int>(heightValue))
heightValue = imageSize.height();
OwnPtr<ImageBuffer> maskImage = ImageBuffer::create(imageSize, false);
if (!maskImage)
return 0;
maskDestRect = FloatRect(xValue, yValue, widthValue, heightValue);
if (maskUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
maskDestRect.move(targetRect.x(), targetRect.y());
GraphicsContext* maskImageContext = maskImage->context();
ASSERT(maskImageContext);
maskImageContext->save();
maskImageContext->translate(-xValue, -yValue);
if (maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
maskImageContext->save();
maskImageContext->scale(FloatSize(targetRect.width(), targetRect.height()));
}
// Render subtree into ImageBuffer
for (Node* n = firstChild(); n; n = n->nextSibling()) {
SVGElement* elem = 0;
if (n->isSVGElement())
elem = static_cast<SVGElement*>(n);
if (!elem || !elem->isStyled())
continue;
SVGStyledElement* e = static_cast<SVGStyledElement*>(elem);
RenderObject* item = e->renderer();
if (!item)
continue;
renderSubtreeToImage(maskImage.get(), item);
}
if (maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
maskImageContext->restore();
maskImageContext->restore();
return maskImage.release();
}
PassOwnPtr<ImageBuffer> SVGMaskElement::drawMaskerContent(const FloatRect& targetRect, FloatRect& maskDestRect) const
{
// Determine specified mask size
if (maskUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
maskDestRect = FloatRect(x().valueAsPercentage() * targetRect.width(),
y().valueAsPercentage() * targetRect.height(),
width().valueAsPercentage() * targetRect.width(),
height().valueAsPercentage() * targetRect.height());
else
maskDestRect = FloatRect(x().value(this),
y().value(this),
width().value(this),
height().value(this));
IntSize imageSize(lroundf(maskDestRect.width()), lroundf(maskDestRect.height()));
clampImageBufferSizeToViewport(document()->view(), imageSize);
if (imageSize.width() < static_cast<int>(maskDestRect.width()))
maskDestRect.setWidth(imageSize.width());
if (imageSize.height() < static_cast<int>(maskDestRect.height()))
maskDestRect.setHeight(imageSize.height());
// FIXME: This changes color space to linearRGB, the default color space
// for masking operations in SVG. We need a switch for the other color-space
// attribute values sRGB, inherit and auto.
OwnPtr<ImageBuffer> maskImage = ImageBuffer::create(imageSize, LinearRGB);
if (!maskImage)
return 0;
FloatPoint maskContextLocation = maskDestRect.location();
if (maskUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
maskDestRect.move(targetRect.x(), targetRect.y());
if (maskContentUnits() != SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
maskContextLocation.move(targetRect.x(), targetRect.y());
GraphicsContext* maskImageContext = maskImage->context();
ASSERT(maskImageContext);
maskImageContext->save();
maskImageContext->translate(-maskContextLocation.x(), -maskContextLocation.y());
if (maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
maskImageContext->save();
maskImageContext->scale(FloatSize(targetRect.width(), targetRect.height()));
}
// Render subtree into ImageBuffer
for (Node* n = firstChild(); n; n = n->nextSibling()) {
SVGElement* elem = 0;
if (n->isSVGElement())
elem = static_cast<SVGElement*>(n);
if (!elem || !elem->isStyled())
continue;
SVGStyledElement* e = static_cast<SVGStyledElement*>(elem);
RenderObject* item = e->renderer();
if (!item)
continue;
renderSubtreeToImage(maskImage.get(), item);
}
if (maskContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
maskImageContext->restore();
maskImageContext->restore();
return maskImage.release();
}
