PassOwnPtr<ImageBuffer> RenderSVGResourcePattern::createTileImage(const PatternAttributes& attributes,
const FloatRect& tileBoundaries,
const FloatRect& absoluteTileBoundaries,
const AffineTransform& tileImageTransform) const
{
FloatRect clampedAbsoluteTileBoundaries = SVGRenderingContext::clampedAbsoluteTargetRect(absoluteTileBoundaries);
IntSize imageSize(roundedIntSize(clampedAbsoluteTileBoundaries.size()));
if (imageSize.isEmpty())
return nullptr;
OwnPtr<ImageBuffer> tileImage = ImageBuffer::create(imageSize);
if (!tileImage)
return nullptr;
GraphicsContext* tileImageContext = tileImage->context();
ASSERT(tileImageContext);
IntSize unclampedImageSize(roundedIntSize(absoluteTileBoundaries.size()));
tileImageContext->scale(unclampedImageSize.width() / absoluteTileBoundaries.width(), unclampedImageSize.height() / absoluteTileBoundaries.height());
// The image buffer represents the final rendered size, so the content has to be scaled (to avoid pixelation).
tileImageContext->scale(
clampedAbsoluteTileBoundaries.width() / tileBoundaries.width(),
clampedAbsoluteTileBoundaries.height() / tileBoundaries.height());
// Apply tile image transformations.
if (!tileImageTransform.isIdentity())
tileImageContext->concatCTM(tileImageTransform);
AffineTransform contentTransformation;
if (attributes.patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
contentTransformation = tileImageTransform;
// Draw the content into the ImageBuffer.
for (Element* element = ElementTraversal::firstWithin(*attributes.patternContentElement()); element; element = ElementTraversal::nextSibling(*element)) {
if (!element->isSVGElement() || !element->renderer())
continue;
if (element->renderer()->needsLayout())
return nullptr;
SVGRenderingContext::renderSubtree(tileImage->context(), element->renderer(), contentTransformation);
}
return tileImage.release();
}
bool SVGImageBufferTools::createImageBuffer(const FloatRect& absoluteTargetRect, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer, ColorSpace colorSpace, RenderingMode renderingMode)
{
IntSize imageSize(roundedImageBufferSize(clampedAbsoluteTargetRect.size()));
IntSize unclampedImageSize(SVGImageBufferTools::roundedImageBufferSize(absoluteTargetRect.size()));
// Don't create empty ImageBuffers.
if (imageSize.isEmpty())
return false;
OwnPtr<ImageBuffer> image = ImageBuffer::create(imageSize, colorSpace, renderingMode);
if (!image)
return false;
GraphicsContext* imageContext = image->context();
ASSERT(imageContext);
// Compensate rounding effects, as the absolute target rect is using floating-point numbers and the image buffer size is integer.
imageContext->scale(FloatSize(unclampedImageSize.width() / absoluteTargetRect.width(), unclampedImageSize.height() / absoluteTargetRect.height()));
imageBuffer = image.release();
return true;
}
