void RenderSVGRoot::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const
{
// Spec: http://www.w3.org/TR/SVG/coords.html#IntrinsicSizing
// SVG needs to specify how to calculate some intrinsic sizing properties to enable inclusion within other languages.
// The intrinsic width and height of the viewport of SVG content must be determined from the ‘width’ and ‘height’ attributes.
// If either of these are not specified, a value of '100%' must be assumed. Note: the ‘width’ and ‘height’ attributes are not
// the same as the CSS width and height properties. Specifically, percentage values do not provide an intrinsic width or height,
// and do not indicate a percentage of the containing block. Rather, once the viewport is established, they indicate the portion
// of the viewport that is actually covered by image data.
SVGSVGElement* svg = static_cast<SVGSVGElement*>(node());
Length intrinsicWidthAttribute = svg->intrinsicWidth(SVGSVGElement::IgnoreCSSProperties);
Length intrinsicHeightAttribute = svg->intrinsicHeight(SVGSVGElement::IgnoreCSSProperties);
// The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including SVG from an ‘object’
// element in HTML styled with CSS. It is possible (indeed, common) for an SVG graphic to have an intrinsic aspect ratio but
// not to have an intrinsic width or height. The intrinsic aspect ratio must be calculated based upon the following rules:
// - The aspect ratio is calculated by dividing a width by a height.
// - If the ‘width’ and ‘height’ of the rootmost ‘svg’ element are both specified with unit identifiers (in, mm, cm, pt, pc,
// px, em, ex) or in user units, then the aspect ratio is calculated from the ‘width’ and ‘height’ attributes after
// resolving both values to user units.
if (intrinsicWidthAttribute.isFixed() || intrinsicHeightAttribute.isFixed()) {
if (intrinsicWidthAttribute.isFixed())
intrinsicSize.setWidth(floatValueForLength(intrinsicWidthAttribute, 0));
if (intrinsicHeightAttribute.isFixed())
intrinsicSize.setHeight(floatValueForLength(intrinsicHeightAttribute, 0));
if (!intrinsicSize.isEmpty())
intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
return;
}
// - If either/both of the ‘width’ and ‘height’ of the rootmost ‘svg’ element are in percentage units (or omitted), the
// aspect ratio is calculated from the width and height values of the ‘viewBox’ specified for the current SVG document
// fragment. If the ‘viewBox’ is not correctly specified, or set to 'none', the intrinsic aspect ratio cannot be
// calculated and is considered unspecified.
intrinsicSize = svg->viewBox().size();
if (!intrinsicSize.isEmpty()) {
// The viewBox can only yield an intrinsic ratio, not an intrinsic size.
intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
intrinsicSize = FloatSize();
return;
}
// If our intrinsic size is in percentage units, return those to the caller through the intrinsicSize. Notify the caller
// about the special situation, by setting isPercentageIntrinsicSize=true, so it knows how to interpret the return values.
if (intrinsicWidthAttribute.isPercent() && intrinsicHeightAttribute.isPercent()) {
isPercentageIntrinsicSize = true;
intrinsicSize = FloatSize(intrinsicWidthAttribute.percent(), intrinsicHeightAttribute.percent());
}
}
void RenderReplaced::computeAspectRatioInformationForRenderBox(RenderBox* contentRenderer, FloatSize& constrainedSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const
{
FloatSize intrinsicSize;
if (contentRenderer) {
contentRenderer->computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio, isPercentageIntrinsicSize);
if (intrinsicRatio)
ASSERT(!isPercentageIntrinsicSize);
// Handle zoom & vertical writing modes here, as the embedded document doesn't know about them.
if (!isPercentageIntrinsicSize)
intrinsicSize.scale(style()->effectiveZoom());
if (rendererHasAspectRatio(this) && isPercentageIntrinsicSize)
intrinsicRatio = 1;
// Update our intrinsic size to match what the content renderer has computed, so that when we
// constrain the size below, the correct intrinsic size will be obtained for comparison against
// min and max widths.
if (intrinsicRatio && !isPercentageIntrinsicSize && !intrinsicSize.isEmpty())
m_intrinsicSize = LayoutSize(intrinsicSize);
if (!isHorizontalWritingMode()) {
if (intrinsicRatio)
intrinsicRatio = 1 / intrinsicRatio;
intrinsicSize = intrinsicSize.transposedSize();
}
} else {
computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio, isPercentageIntrinsicSize);
if (intrinsicRatio) {
ASSERT(!isPercentageIntrinsicSize);
if (!intrinsicSize.isEmpty())
m_intrinsicSize = LayoutSize(isHorizontalWritingMode() ? intrinsicSize : intrinsicSize.transposedSize());
}
}
// Now constrain the intrinsic size along each axis according to minimum and maximum width/heights along the
// opposite axis. So for example a maximum width that shrinks our width will result in the height we compute here
// having to shrink in order to preserve the aspect ratio. Because we compute these values independently along
// each axis, the final returned size may in fact not preserve the aspect ratio.
// FIXME: In the long term, it might be better to just return this code more to the way it used to be before this
// function was added, since all it has done is make the code more unclear.
constrainedSize = intrinsicSize;
if (intrinsicRatio && !isPercentageIntrinsicSize && !intrinsicSize.isEmpty() && style()->logicalWidth().isAuto() && style()->logicalHeight().isAuto()) {
// We can't multiply or divide by 'intrinsicRatio' here, it breaks tests, like fast/images/zoomed-img-size.html, which
// can only be fixed once subpixel precision is available for things like intrinsicWidth/Height - which include zoom!
constrainedSize.setWidth(RenderBox::computeReplacedLogicalHeight() * intrinsicSize.width() / intrinsicSize.height());
constrainedSize.setHeight(RenderBox::computeReplacedLogicalWidth() * intrinsicSize.height() / intrinsicSize.width());
}
}
bool SVGLengthContext::determineViewport(FloatSize& viewportSize) const
{
if (!m_context)
return false;
// If an overriden viewport is given, it has precedence.
if (!m_overridenViewport.isEmpty()) {
viewportSize = m_overridenViewport.size();
return true;
}
// Root <svg> element lengths are resolved against the top level viewport.
if (m_context->isOutermostSVGSVGElement()) {
viewportSize = downcast<SVGSVGElement>(*m_context).currentViewportSize();
return true;
}
// Take size from nearest viewport element.
SVGElement* viewportElement = m_context->viewportElement();
if (!is<SVGSVGElement>(viewportElement))
return false;
const SVGSVGElement& svg = downcast<SVGSVGElement>(*viewportElement);
viewportSize = svg.currentViewBoxRect().size();
if (viewportSize.isEmpty())
viewportSize = svg.currentViewportSize();
return true;
}
bool ImageBuffer::sizeNeedsClamping(const FloatSize& size)
{
if (size.isEmpty())
return false;
return floorf(size.height()) * floorf(size.width()) > MaxClampedArea;
}
void RenderSVGRoot::computeIntrinsicRatioInformation(FloatSize& intrinsicRatio, bool& isPercentageIntrinsicSize) const
{
// Spec: http://dev.w3.org/SVG/profiles/1.1F2/publish/coords.html#IntrinsicSizing
// The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including
// SVG from an ‘object’ element in HTML styled with CSS. It is possible (indeed, common) for an SVG
// graphic to have an intrinsic aspect ratio but not to have an intrinsic width or height.
// The intrinsic aspect ratio must be calculated based upon the following rules:
// The aspect ratio is calculated by dividing a width by a height.
// If the ‘width’ and ‘height’ of the rootmost ‘svg’ element are both specified with unit identifiers
// (in, mm, cm, pt, pc, px, em, ex) or in user units, then the aspect ratio is calculated from the
// ‘width’ and ‘height’ attributes after resolving both values to user units.
isPercentageIntrinsicSize = false;
if (style()->width().isFixed() && style()->height().isFixed()) {
intrinsicRatio = FloatSize(width(), height());
return;
}
// If either/both of the ‘width’ and ‘height’ of the rootmost ‘svg’ element are in percentage units (or omitted),
// the aspect ratio is calculated from the width and height values of the ‘viewBox’ specified for the current SVG
// document fragment. If the ‘viewBox’ is not correctly specified, or set to 'none', the intrinsic aspect ratio
// cannot be calculated and is considered unspecified.
intrinsicRatio = static_cast<SVGSVGElement*>(node())->currentViewBoxRect().size();
// Compatibility with authors expectations and Firefox/Opera: when percentage units are used, take them into
// account for certain cases of the intrinsic width/height calculation in RenderPart::computeReplacedLogicalWidth/Height.
if (intrinsicRatio.isEmpty() && style()->width().isPercent() && style()->height().isPercent()) {
isPercentageIntrinsicSize = true;
intrinsicRatio = FloatSize(style()->width().percent(), style()->height().percent());
}
}
RefPtr<Image> CSSCrossfadeValue::image(RenderElement* renderer, const FloatSize& size)
{
if (size.isEmpty())
return nullptr;
// FIXME: Skip Content Security Policy check when cross fade is applied to an element in a user agent shadow tree.
// See <https://bugs.webkit.org/show_bug.cgi?id=146663>.
ResourceLoaderOptions options = CachedResourceLoader::defaultCachedResourceOptions();
CachedResourceLoader& cachedResourceLoader = renderer->document().cachedResourceLoader();
CachedImage* cachedFromImage = cachedImageForCSSValue(m_fromValue, cachedResourceLoader, options);
CachedImage* cachedToImage = cachedImageForCSSValue(m_toValue, cachedResourceLoader, options);
if (!cachedFromImage || !cachedToImage)
return Image::nullImage();
Image* fromImage = cachedFromImage->imageForRenderer(renderer);
Image* toImage = cachedToImage->imageForRenderer(renderer);
if (!fromImage || !toImage)
return Image::nullImage();
m_generatedImage = CrossfadeGeneratedImage::create(*fromImage, *toImage, m_percentageValue->getFloatValue(), fixedSize(renderer), size);
return m_generatedImage;
}
bool SVGLengthContext::determineViewport(float& width, float& height) const
{
if (!m_context)
return false;
// If an overriden viewport is given, it has precedence.
if (!m_overridenViewport.isEmpty()) {
width = m_overridenViewport.width();
height = m_overridenViewport.height();
return true;
}
// SVGLengthContext should NEVER be used to resolve width/height values for <svg> elements,
// as they require special treatment, due the relationship with the CSS width/height properties.
ASSERT(m_context->document().documentElement() != m_context);
// Take size from nearest viewport element.
SVGElement* viewportElement = m_context->viewportElement();
if (!viewportElement || !viewportElement->isSVGSVGElement())
return false;
const SVGSVGElement* svg = static_cast<const SVGSVGElement*>(viewportElement);
FloatSize viewportSize = svg->currentViewBoxRect().size();
if (viewportSize.isEmpty())
viewportSize = svg->currentViewportSize();
width = viewportSize.width();
height = viewportSize.height();
return true;
}
IntSize SVGImage::containerSize() const
{
SVGSVGElement* rootElement = this->rootElement();
if (!rootElement)
return IntSize();
auto* renderer = downcast<RenderSVGRoot>(rootElement->renderer());
if (!renderer)
return IntSize();
// If a container size is available it has precedence.
IntSize containerSize = renderer->containerSize();
if (!containerSize.isEmpty())
return containerSize;
// Assure that a container size is always given for a non-identity zoom level.
ASSERT(renderer->style().effectiveZoom() == 1);
FloatSize currentSize;
if (rootElement->hasIntrinsicWidth() && rootElement->hasIntrinsicHeight())
currentSize = rootElement->currentViewportSize();
else
currentSize = rootElement->currentViewBoxRect().size();
if (!currentSize.isEmpty())
return IntSize(static_cast<int>(ceilf(currentSize.width())), static_cast<int>(ceilf(currentSize.height())));
// As last resort, use CSS default intrinsic size.
return IntSize(300, 150);
}
IntSize SVGImage::containerSize() const
{
if (!m_page)
return IntSize();
Frame* frame = m_page->mainFrame();
SVGSVGElement* rootElement = toSVGDocument(frame->document())->rootElement();
if (!rootElement)
return IntSize();
RenderSVGRoot* renderer = toRenderSVGRoot(rootElement->renderer());
if (!renderer)
return IntSize();
// If a container size is available it has precedence.
IntSize containerSize = renderer->containerSize();
if (!containerSize.isEmpty())
return containerSize;
// Assure that a container size is always given for a non-identity zoom level.
ASSERT(renderer->style()->effectiveZoom() == 1);
FloatSize currentSize;
if (rootElement->intrinsicWidth().isFixed() && rootElement->intrinsicHeight().isFixed())
currentSize = rootElement->currentViewportSize();
else
currentSize = rootElement->currentViewBoxRect().size();
if (!currentSize.isEmpty())
return IntSize(static_cast<int>(ceilf(currentSize.width())), static_cast<int>(ceilf(currentSize.height())));
// As last resort, use CSS default intrinsic size.
return IntSize(300, 150);
}
void RenderReplaced::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
{
intrinsicSize = FloatSize(intrinsicLogicalWidth().toFloat(), intrinsicLogicalHeight().toFloat());
// Figure out if we need to compute an intrinsic ratio.
if (intrinsicSize.isEmpty() || !rendererHasAspectRatio(this))
return;
intrinsicRatio = intrinsicSize.width() / intrinsicSize.height();
}
IntSize SVGImage::containerSize() const
{
SVGSVGElement* rootElement = svgRootElement(m_page.get());
if (!rootElement)
return IntSize();
LayoutSVGRoot* layoutObject = toLayoutSVGRoot(rootElement->layoutObject());
if (!layoutObject)
return IntSize();
// If a container size is available it has precedence.
IntSize containerSize = layoutObject->containerSize();
if (!containerSize.isEmpty())
return containerSize;
// Assure that a container size is always given for a non-identity zoom level.
ASSERT(layoutObject->style()->effectiveZoom() == 1);
FloatSize intrinsicSize;
double intrinsicRatio = 0;
layoutObject->computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
if (intrinsicSize.isEmpty() && intrinsicRatio) {
if (!intrinsicSize.width() && intrinsicSize.height())
intrinsicSize.setWidth(intrinsicSize.height() * intrinsicRatio);
else if (intrinsicSize.width() && !intrinsicSize.height())
intrinsicSize.setHeight(intrinsicSize.width() / intrinsicRatio);
}
// TODO(davve): In order to maintain aspect ratio the intrinsic
// size is faked from the viewBox as a last resort. This may cause
// unwanted side effects. Preferably we should be able to signal
// the intrinsic ratio in another way.
if (intrinsicSize.isEmpty())
intrinsicSize = rootElement->currentViewBoxRect().size();
if (!intrinsicSize.isEmpty())
return expandedIntSize(intrinsicSize);
// As last resort, use CSS replaced element fallback size.
return IntSize(300, 150);
}
void PageViewportController::didChangeViewportSize(const FloatSize& newSize)
{
if (newSize.isEmpty())
return;
m_viewportSize = newSize;
// Let the WebProcess know about the new viewport size, so that
// it can resize the content accordingly.
m_webPageProxy->setViewportSize(roundedIntSize(newSize));
}
FloatSize ImageBuffer::clampedSize(const FloatSize& size, FloatSize& scale)
{
if (size.isEmpty())
return size;
FloatSize clampedSize = ImageBuffer::clampedSize(size);
scale = FloatSize(clampedSize.width() / size.width(), clampedSize.height() / size.height());
ASSERT(!sizeNeedsClamping(clampedSize));
ASSERT(!sizeNeedsClamping(size, scale));
return clampedSize;
}
void RenderReplaced::computeAspectRatioInformationForRenderBox(FloatSize& constrainedSize, double& intrinsicRatio) const
{
FloatSize intrinsicSize;
computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
if (intrinsicRatio && !intrinsicSize.isEmpty())
m_intrinsicSize = LayoutSize(intrinsicSize);
// Now constrain the intrinsic size along each axis according to minimum and maximum width/heights along the
// opposite axis. So for example a maximum width that shrinks our width will result in the height we compute here
// having to shrink in order to preserve the aspect ratio. Because we compute these values independently along
// each axis, the final returned size may in fact not preserve the aspect ratio.
// FIXME: In the long term, it might be better to just return this code more to the way it used to be before this
// function was added, since all it has done is make the code more unclear.
constrainedSize = intrinsicSize;
if (intrinsicRatio && !intrinsicSize.isEmpty() && style()->logicalWidth().isAuto() && style()->logicalHeight().isAuto()) {
// We can't multiply or divide by 'intrinsicRatio' here, it breaks tests, like fast/images/zoomed-img-size.html, which
// can only be fixed once subpixel precision is available for things like intrinsicWidth/Height.
constrainedSize.setWidth(RenderBox::computeReplacedLogicalHeight() * intrinsicSize.width() / intrinsicSize.height());
constrainedSize.setHeight(RenderBox::computeReplacedLogicalWidth() * intrinsicSize.height() / intrinsicSize.width());
}
}
void RenderReplaced::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
{
// If there's an embeddedContentBox() of a remote, referenced document available, this code-path should never be used.
ASSERT(!embeddedContentBox());
intrinsicSize = FloatSize(intrinsicLogicalWidth(), intrinsicLogicalHeight());
// Figure out if we need to compute an intrinsic ratio.
if (intrinsicSize.isEmpty() || !hasAspectRatio())
return;
intrinsicRatio = intrinsicSize.width() / intrinsicSize.height();
}
static inline IntSize resolveAgainstIntrinsicWidthOrHeightAndRatio(const IntSize& size, const FloatSize& intrinsicRatio, int useWidth, int useHeight)
{
if (intrinsicRatio.isEmpty()) {
if (useWidth)
return IntSize(useWidth, size.height());
return IntSize(size.width(), useHeight);
}
if (useWidth)
return IntSize(useWidth, resolveHeightForRatio(useWidth, intrinsicRatio));
return IntSize(resolveWidthForRatio(useHeight, intrinsicRatio), useHeight);
}
void LayoutSVGRoot::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
{
// https://www.w3.org/TR/SVG/coords.html#IntrinsicSizing
intrinsicSize = calculateIntrinsicSize();
if (!isHorizontalWritingMode())
intrinsicSize = intrinsicSize.transposedSize();
if (!intrinsicSize.isEmpty()) {
intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
} else {
SVGSVGElement* svg = toSVGSVGElement(node());
ASSERT(svg);
FloatSize viewBoxSize = svg->viewBox()->currentValue()->value().size();
if (!viewBoxSize.isEmpty()) {
// The viewBox can only yield an intrinsic ratio, not an intrinsic size.
intrinsicRatio = viewBoxSize.width() / static_cast<double>(viewBoxSize.height());
if (!isHorizontalWritingMode())
intrinsicRatio = 1 / intrinsicRatio;
}
}
}
void SVGImage::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
{
SVGSVGElement* rootElement = this->rootElement();
if (!rootElement)
return;
intrinsicWidth = rootElement->intrinsicWidth();
intrinsicHeight = rootElement->intrinsicHeight();
if (rootElement->preserveAspectRatio().align() == SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_NONE)
return;
intrinsicRatio = rootElement->viewBox().size();
if (intrinsicRatio.isEmpty() && intrinsicWidth.isFixed() && intrinsicHeight.isFixed())
intrinsicRatio = FloatSize(floatValueForLength(intrinsicWidth, 0), floatValueForLength(intrinsicHeight, 0));
}
FloatPoint Widget::convertFromContainingWindow(const FloatPoint& windowPoint) const
{
// Widgets / windows are required to be IntPoint aligned, but we may need to convert
// FloatPoint values within them (eg. for event co-ordinates).
IntPoint flooredPoint = flooredIntPoint(windowPoint);
FloatPoint parentPoint = this->convertFromContainingWindow(flooredPoint);
FloatSize windowFraction = windowPoint - flooredPoint;
// Use linear interpolation handle any fractional value (eg. for iframes subject to a transform
// beyond just a simple translation).
// FIXME: Add FloatPoint variants of all co-ordinate space conversion APIs.
if (!windowFraction.isEmpty()) {
const int kFactor = 1000;
IntPoint parentLineEnd = this->convertFromContainingWindow(flooredPoint + roundedIntSize(windowFraction.scaledBy(kFactor)));
FloatSize parentFraction = (parentLineEnd - parentPoint).scaledBy(1.0f / kFactor);
parentPoint.move(parentFraction);
}
return parentPoint;
}
void SVGImage::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
{
if (!m_page)
return;
Frame* frame = m_page->mainFrame();
SVGSVGElement* rootElement = static_cast<SVGDocument*>(frame->document())->rootElement();
if (!rootElement)
return;
intrinsicWidth = rootElement->intrinsicWidth();
intrinsicHeight = rootElement->intrinsicHeight();
if (rootElement->preserveAspectRatio().align() == SVGPreserveAspectRatio::SVG_PRESERVEASPECTRATIO_NONE)
return;
intrinsicRatio = rootElement->viewBox().size();
if (intrinsicRatio.isEmpty() && intrinsicWidth.isFixed() && intrinsicHeight.isFixed())
intrinsicRatio = FloatSize(intrinsicWidth.calcFloatValue(0), intrinsicHeight.calcFloatValue(0));
}
void RenderImage::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const
{
RenderReplaced::computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio, isPercentageIntrinsicSize);
// Our intrinsicSize is empty if we're rendering generated images with relative width/height. Figure out the right intrinsic size to use.
if (intrinsicSize.isEmpty() && (m_imageResource->imageHasRelativeWidth() || m_imageResource->imageHasRelativeHeight())) {
RenderObject* containingBlock = isOutOfFlowPositioned() ? container() : this->containingBlock();
if (containingBlock->isBox()) {
RenderBox* box = toRenderBox(containingBlock);
intrinsicSize.setWidth(box->availableLogicalWidth());
intrinsicSize.setHeight(box->availableLogicalHeight(IncludeMarginBorderPadding));
}
}
// Don't compute an intrinsic ratio to preserve historical WebKit behavior if we're painting alt text and/or a broken image.
if (m_imageResource && m_imageResource->errorOccurred()) {
intrinsicRatio = 1;
return;
}
}
void RenderReplaced::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio, bool& isPercentageIntrinsicSize) const
{
// If there's an embeddedContentBox() of a remote, referenced document available, this code-path should never be used.
ASSERT(!embeddedContentBox());
isPercentageIntrinsicSize = false;
intrinsicSize = FloatSize(intrinsicLogicalWidth(), intrinsicLogicalHeight());
// Figure out if we need to compute an intrinsic ratio.
if (intrinsicSize.isEmpty() || !rendererHasAspectRatio(this))
return;
intrinsicRatio = intrinsicSize.width() / intrinsicSize.height();
if (style()->logicalWidth().isAuto() && style()->logicalHeight().isAuto()) {
// We can't multiply or divide by 'intrinsicRatio' here, it breaks tests, like fast/images/zoomed-img-size.html, which
// can only be fixed once subpixel precision is available for things like intrinsicWidth/Height - which include zoom!
intrinsicSize.setWidth(RenderBox::computeReplacedLogicalHeight() * intrinsicLogicalWidth() / intrinsicLogicalHeight());
intrinsicSize.setHeight(RenderBox::computeReplacedLogicalWidth() * intrinsicLogicalHeight() / intrinsicLogicalWidth());
}
}
void LayoutImage::computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const
{
LayoutReplaced::computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
// Our intrinsicSize is empty if we're laying out generated images with relative width/height. Figure out the right intrinsic size to use.
if (intrinsicSize.isEmpty() && (m_imageResource->imageHasRelativeWidth() || m_imageResource->imageHasRelativeHeight())) {
LayoutObject* containingBlock = isOutOfFlowPositioned() ? container() : this->containingBlock();
if (containingBlock->isBox()) {
LayoutBox* box = toLayoutBox(containingBlock);
intrinsicSize.setWidth(box->availableLogicalWidth().toFloat());
intrinsicSize.setHeight(box->availableLogicalHeight(IncludeMarginBorderPadding).toFloat());
}
}
// Don't compute an intrinsic ratio to preserve historical WebKit behavior if we're painting alt text and/or a broken image.
// Video is excluded from this behavior because video elements have a default aspect ratio that a failed poster image load should not override.
if (m_imageResource && m_imageResource->errorOccurred() && !isVideo()) {
intrinsicRatio = 1;
return;
}
}
FloatSize SVGSVGElement::currentViewportSize() const
{
FloatSize viewportSize;
if (renderer()) {
if (is<RenderSVGRoot>(*renderer())) {
auto& root = downcast<RenderSVGRoot>(*renderer());
viewportSize = root.contentBoxRect().size() / root.style().effectiveZoom();
} else
viewportSize = downcast<RenderSVGViewportContainer>(*renderer()).viewport().size();
}
if (!viewportSize.isEmpty())
return viewportSize;
if (!(hasIntrinsicWidth() && hasIntrinsicHeight()))
return { };
return FloatSize(floatValueForLength(intrinsicWidth(), 0), floatValueForLength(intrinsicHeight(), 0));
}
IntSize RenderBoxModelObject::calculateImageIntrinsicDimensions(StyleImage* image, const IntSize& positioningAreaSize, ScaleByEffectiveZoomOrNot shouldScaleOrNot) const
{
// A generated image without a fixed size, will always return the container size as intrinsic size.
if (image->isGeneratedImage() && image->usesImageContainerSize())
return IntSize(positioningAreaSize.width(), positioningAreaSize.height());
Length intrinsicWidth;
Length intrinsicHeight;
FloatSize intrinsicRatio;
image->computeIntrinsicDimensions(this, intrinsicWidth, intrinsicHeight, intrinsicRatio);
ASSERT(!intrinsicWidth.isPercent());
ASSERT(!intrinsicHeight.isPercent());
IntSize resolvedSize(intrinsicWidth.value(), intrinsicHeight.value());
IntSize minimumSize(resolvedSize.width() > 0 ? 1 : 0, resolvedSize.height() > 0 ? 1 : 0);
if (shouldScaleOrNot == ScaleByEffectiveZoom)
resolvedSize.scale(style()->effectiveZoom());
resolvedSize.clampToMinimumSize(minimumSize);
if (!resolvedSize.isEmpty())
return resolvedSize;
// If the image has one of either an intrinsic width or an intrinsic height:
// * and an intrinsic aspect ratio, then the missing dimension is calculated from the given dimension and the ratio.
// * and no intrinsic aspect ratio, then the missing dimension is assumed to be the size of the rectangle that
// establishes the coordinate system for the 'background-position' property.
if (resolvedSize.width() > 0 || resolvedSize.height() > 0)
return resolveAgainstIntrinsicWidthOrHeightAndRatio(positioningAreaSize, intrinsicRatio, resolvedSize.width(), resolvedSize.height());
// If the image has no intrinsic dimensions and has an intrinsic ratio the dimensions must be assumed to be the
// largest dimensions at that ratio such that neither dimension exceeds the dimensions of the rectangle that
// establishes the coordinate system for the 'background-position' property.
if (!intrinsicRatio.isEmpty())
return resolveAgainstIntrinsicRatio(positioningAreaSize, intrinsicRatio);
// If the image has no intrinsic ratio either, then the dimensions must be assumed to be the rectangle that
// establishes the coordinate system for the 'background-position' property.
return positioningAreaSize;
}
bool SVGLengthContext::determineViewport(FloatSize& viewportSize) const {
if (!m_context)
return false;
// Root <svg> element lengths are resolved against the top level viewport.
if (m_context->isOutermostSVGSVGElement()) {
viewportSize = toSVGSVGElement(m_context)->currentViewportSize();
return true;
}
// Take size from nearest viewport element.
SVGElement* viewportElement = m_context->viewportElement();
if (!isSVGSVGElement(viewportElement))
return false;
const SVGSVGElement& svg = toSVGSVGElement(*viewportElement);
viewportSize = svg.currentViewBoxRect().size();
if (viewportSize.isEmpty())
viewportSize = svg.currentViewportSize();
return true;
}
RefPtr<Image> CSSFilterImageValue::image(RenderElement* renderer, const FloatSize& size)
{
if (size.isEmpty())
return nullptr;
// FIXME: Skip Content Security Policy check when filter is applied to an element in a user agent shadow tree.
// See <https://bugs.webkit.org/show_bug.cgi?id=146663>.
ResourceLoaderOptions options = CachedResourceLoader::defaultCachedResourceOptions();
CachedResourceLoader& cachedResourceLoader = renderer->document().cachedResourceLoader();
CachedImage* cachedImage = cachedImageForCSSValue(m_imageValue.get(), cachedResourceLoader, options);
if (!cachedImage)
return Image::nullImage();
Image* image = cachedImage->imageForRenderer(renderer);
if (!image)
return Image::nullImage();
// Transform Image into ImageBuffer.
std::unique_ptr<ImageBuffer> texture = ImageBuffer::create(size);
if (!texture)
return Image::nullImage();
FloatRect imageRect = FloatRect(FloatPoint(), size);
texture->context().drawImage(image, ColorSpaceDeviceRGB, imageRect);
RefPtr<FilterEffectRenderer> filterRenderer = FilterEffectRenderer::create();
filterRenderer->setSourceImage(WTF::move(texture));
filterRenderer->setSourceImageRect(imageRect);
filterRenderer->setFilterRegion(imageRect);
if (!filterRenderer->build(renderer, m_filterOperations, FilterFunction))
return Image::nullImage();
filterRenderer->apply();
m_generatedImage = filterRenderer->output()->copyImage();
return m_generatedImage.release();
}
PassRefPtr<Image> CSSCrossfadeValue::image(RenderElement* renderer, const FloatSize& size)
{
if (size.isEmpty())
return nullptr;
CachedResourceLoader& cachedResourceLoader = renderer->document().cachedResourceLoader();
CachedImage* cachedFromImage = cachedImageForCSSValue(m_fromValue.get(), cachedResourceLoader);
CachedImage* cachedToImage = cachedImageForCSSValue(m_toValue.get(), cachedResourceLoader);
if (!cachedFromImage || !cachedToImage)
return Image::nullImage();
Image* fromImage = cachedFromImage->imageForRenderer(renderer);
Image* toImage = cachedToImage->imageForRenderer(renderer);
if (!fromImage || !toImage)
return Image::nullImage();
m_generatedImage = CrossfadeGeneratedImage::create(fromImage, toImage, m_percentageValue->getFloatValue(), fixedSize(renderer), size);
return m_generatedImage.release();
}
static void drawGDIGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
int from, int numGlyphs, const FloatPoint& point)
{
Color fillColor = graphicsContext->fillColor();
bool drawIntoBitmap = false;
int drawingMode = graphicsContext->textDrawingMode();
if (drawingMode == cTextFill) {
if (!fillColor.alpha())
return;
drawIntoBitmap = fillColor.alpha() != 255 || graphicsContext->inTransparencyLayer();
if (!drawIntoBitmap) {
FloatSize size;
float blur;
Color color;
graphicsContext->getShadow(size, blur, color);
drawIntoBitmap = !size.isEmpty() || blur;
}
}
// We have to convert CG's two-dimensional floating point advances to just horizontal integer advances.
Vector<int, 2048> gdiAdvances;
int totalWidth = 0;
for (int i = 0; i < numGlyphs; i++) {
gdiAdvances.append(lroundf(glyphBuffer.advanceAt(from + i)));
totalWidth += gdiAdvances[i];
}
HDC hdc = 0;
OwnPtr<GraphicsContext::WindowsBitmap> bitmap;
IntRect textRect;
if (!drawIntoBitmap)
hdc = graphicsContext->getWindowsContext(textRect, true, false);
if (!hdc) {
drawIntoBitmap = true;
// We put slop into this rect, since glyphs can overflow the ascent/descent bounds and the left/right edges.
// FIXME: Can get glyphs' optical bounds (even from CG) to get this right.
int lineGap = font->lineGap();
textRect = IntRect(point.x() - (font->ascent() + font->descent()) / 2, point.y() - font->ascent() - lineGap, totalWidth + font->ascent() + font->descent(), font->lineSpacing());
bitmap.set(graphicsContext->createWindowsBitmap(textRect.size()));
memset(bitmap->buffer(), 255, bitmap->bufferLength());
hdc = bitmap->hdc();
XFORM xform;
xform.eM11 = 1.0f;
xform.eM12 = 0.0f;
xform.eM21 = 0.0f;
xform.eM22 = 1.0f;
xform.eDx = -textRect.x();
xform.eDy = -textRect.y();
SetWorldTransform(hdc, &xform);
}
SelectObject(hdc, font->platformData().hfont());
// Set the correct color.
if (drawIntoBitmap)
SetTextColor(hdc, RGB(0, 0, 0));
else
SetTextColor(hdc, RGB(fillColor.red(), fillColor.green(), fillColor.blue()));
SetBkMode(hdc, TRANSPARENT);
SetTextAlign(hdc, TA_LEFT | TA_BASELINE);
// Uniscribe gives us offsets to help refine the positioning of combining glyphs.
FloatSize translation = glyphBuffer.offsetAt(from);
if (translation.width() || translation.height()) {
XFORM xform;
xform.eM11 = 1.0;
xform.eM12 = 0;
xform.eM21 = 0;
xform.eM22 = 1.0;
xform.eDx = translation.width();
xform.eDy = translation.height();
ModifyWorldTransform(hdc, &xform, MWT_LEFTMULTIPLY);
}
if (drawingMode == cTextFill) {
XFORM xform;
xform.eM11 = 1.0;
xform.eM12 = 0;
xform.eM21 = font->platformData().syntheticOblique() ? -tanf(syntheticObliqueAngle * piFloat / 180.0f) : 0;
xform.eM22 = 1.0;
xform.eDx = point.x();
xform.eDy = point.y();
ModifyWorldTransform(hdc, &xform, MWT_LEFTMULTIPLY);
ExtTextOut(hdc, 0, 0, ETO_GLYPH_INDEX, 0, reinterpret_cast<const WCHAR*>(glyphBuffer.glyphs(from)), numGlyphs, gdiAdvances.data());
if (font->syntheticBoldOffset()) {
xform.eM21 = 0;
xform.eDx = font->syntheticBoldOffset();
xform.eDy = 0;
ModifyWorldTransform(hdc, &xform, MWT_LEFTMULTIPLY);
ExtTextOut(hdc, 0, 0, ETO_GLYPH_INDEX, 0, reinterpret_cast<const WCHAR*>(glyphBuffer.glyphs(from)), numGlyphs, gdiAdvances.data());
}
} else {
XFORM xform;
GetWorldTransform(hdc, &xform);
AffineTransform hdcTransform(xform.eM11, xform.eM21, xform.eM12, xform.eM22, xform.eDx, xform.eDy);
CGAffineTransform initialGlyphTransform = hdcTransform.isInvertible() ? hdcTransform.inverse() : CGAffineTransformIdentity;
if (font->platformData().syntheticOblique())
initialGlyphTransform = CGAffineTransformConcat(initialGlyphTransform, CGAffineTransformMake(1, 0, tanf(syntheticObliqueAngle * piFloat / 180.0f), 1, 0, 0));
initialGlyphTransform.tx = 0;
initialGlyphTransform.ty = 0;
CGContextRef cgContext = graphicsContext->platformContext();
CGContextSaveGState(cgContext);
BOOL fontSmoothingEnabled = false;
SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &fontSmoothingEnabled, 0);
CGContextSetShouldAntialias(cgContext, fontSmoothingEnabled);
CGContextScaleCTM(cgContext, 1.0, -1.0);
CGContextTranslateCTM(cgContext, point.x() + glyphBuffer.offsetAt(from).width(), -(point.y() + glyphBuffer.offsetAt(from).height()));
for (unsigned i = 0; i < numGlyphs; ++i) {
RetainPtr<CGPathRef> glyphPath(AdoptCF, createPathForGlyph(hdc, glyphBuffer.glyphAt(from + i)));
CGContextSaveGState(cgContext);
CGContextConcatCTM(cgContext, initialGlyphTransform);
if (drawingMode & cTextFill) {
CGContextAddPath(cgContext, glyphPath.get());
CGContextFillPath(cgContext);
if (font->syntheticBoldOffset()) {
CGContextTranslateCTM(cgContext, font->syntheticBoldOffset(), 0);
CGContextAddPath(cgContext, glyphPath.get());
CGContextFillPath(cgContext);
CGContextTranslateCTM(cgContext, -font->syntheticBoldOffset(), 0);
}
}
if (drawingMode & cTextStroke) {
CGContextAddPath(cgContext, glyphPath.get());
CGContextStrokePath(cgContext);
if (font->syntheticBoldOffset()) {
CGContextTranslateCTM(cgContext, font->syntheticBoldOffset(), 0);
CGContextAddPath(cgContext, glyphPath.get());
CGContextStrokePath(cgContext);
CGContextTranslateCTM(cgContext, -font->syntheticBoldOffset(), 0);
}
}
CGContextRestoreGState(cgContext);
CGContextTranslateCTM(cgContext, gdiAdvances[i], 0);
}
CGContextRestoreGState(cgContext);
}
if (drawIntoBitmap) {
UInt8* buffer = bitmap->buffer();
unsigned bufferLength = bitmap->bufferLength();
for (unsigned i = 0; i < bufferLength; i += 4) {
// Use green, which is always in the middle.
UInt8 alpha = (255 - buffer[i + 1]) * fillColor.alpha() / 255;
buffer[i] = fillColor.blue();
buffer[i + 1] = fillColor.green();
buffer[i + 2] = fillColor.red();
buffer[i + 3] = alpha;
}
graphicsContext->drawWindowsBitmap(bitmap.get(), textRect.topLeft());
} else
graphicsContext->releaseWindowsContext(hdc, textRect, true, false);
}