static inline IntSize resolveAgainstIntrinsicRatio(const IntSize& size, const FloatSize& intrinsicRatio)
{
// Two possible solutions: (size.width(), solutionHeight) or (solutionWidth, size.height())
// "... must be assumed to be the largest dimensions..." = easiest answer: the rect with the largest surface area.
int solutionWidth = resolveWidthForRatio(size.height(), intrinsicRatio);
int solutionHeight = resolveHeightForRatio(size.width(), intrinsicRatio);
if (solutionWidth <= size.width()) {
if (solutionHeight <= size.height()) {
// If both solutions fit, choose the one covering the larger area.
int areaOne = solutionWidth * size.height();
int areaTwo = size.width() * solutionHeight;
if (areaOne < areaTwo)
return IntSize(size.width(), solutionHeight);
return IntSize(solutionWidth, size.height());
}
// Only the first solution fits.
return IntSize(solutionWidth, size.height());
}
// Only the second solution fits, assert that.
ASSERT(solutionHeight <= size.height());
return IntSize(size.width(), solutionHeight);
}
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);
}
FloatSize LayoutSVGImage::calculateObjectSize() const {
ImageResourceContent* cachedImage = m_imageResource->cachedImage();
if (!cachedImage || cachedImage->errorOccurred())
return m_objectBoundingBox.size();
FloatSize intrinsicSize = FloatSize(cachedImage->getImage()->size());
if (styleRef().width().isAuto() && styleRef().height().isAuto())
return intrinsicSize;
if (styleRef().height().isAuto())
return FloatSize(
m_objectBoundingBox.width(),
resolveHeightForRatio(m_objectBoundingBox.width(), intrinsicSize));
DCHECK(styleRef().width().isAuto());
return FloatSize(
resolveWidthForRatio(m_objectBoundingBox.height(), intrinsicSize),
m_objectBoundingBox.height());
}
LayoutUnit LayoutReplaced::computeReplacedLogicalWidth(
ShouldComputePreferred shouldComputePreferred) const {
if (style()->logicalWidth().isSpecified() ||
style()->logicalWidth().isIntrinsic())
return computeReplacedLogicalWidthRespectingMinMaxWidth(
computeReplacedLogicalWidthUsing(MainOrPreferredSize,
style()->logicalWidth()),
shouldComputePreferred);
LayoutReplaced* contentLayoutObject = embeddedReplacedContent();
// 10.3.2 Inline, replaced elements:
// http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width
IntrinsicSizingInfo intrinsicSizingInfo;
computeIntrinsicSizingInfoForReplacedContent(contentLayoutObject,
intrinsicSizingInfo);
FloatSize constrainedSize =
constrainIntrinsicSizeToMinMax(intrinsicSizingInfo);
if (style()->logicalWidth().isAuto()) {
bool computedHeightIsAuto = style()->logicalHeight().isAuto();
// If 'height' and 'width' both have computed values of 'auto' and the
// element also has an intrinsic width, then that intrinsic width is the
// used value of 'width'.
if (computedHeightIsAuto && intrinsicSizingInfo.hasWidth)
return computeReplacedLogicalWidthRespectingMinMaxWidth(
LayoutUnit(constrainedSize.width()), shouldComputePreferred);
if (!intrinsicSizingInfo.aspectRatio.isEmpty()) {
// If 'height' and 'width' both have computed values of 'auto' and the
// element has no intrinsic width, but does have an intrinsic height and
// intrinsic ratio; or if 'width' has a computed value of 'auto', 'height'
// has some other computed value, and the element does have an intrinsic
// ratio; then the used value of 'width' is: (used height) * (intrinsic
// ratio).
if ((computedHeightIsAuto && !intrinsicSizingInfo.hasWidth &&
intrinsicSizingInfo.hasHeight) ||
!computedHeightIsAuto) {
LayoutUnit estimatedUsedWidth =
intrinsicSizingInfo.hasWidth
? LayoutUnit(constrainedSize.width())
: computeConstrainedLogicalWidth(shouldComputePreferred);
LayoutUnit logicalHeight =
computeReplacedLogicalHeight(estimatedUsedWidth);
return computeReplacedLogicalWidthRespectingMinMaxWidth(
resolveWidthForRatio(logicalHeight,
intrinsicSizingInfo.aspectRatio),
shouldComputePreferred);
}
// If 'height' and 'width' both have computed values of 'auto' and the
// element has an intrinsic ratio but no intrinsic height or width, then
// the used value of 'width' is undefined in CSS 2.1. However, it is
// suggested that, if the containing block's width does not itself depend
// on the replaced element's width, then the used value of 'width' is
// calculated from the constraint equation used for block-level,
// non-replaced elements in normal flow.
if (computedHeightIsAuto && !intrinsicSizingInfo.hasWidth &&
!intrinsicSizingInfo.hasHeight)
return computeConstrainedLogicalWidth(shouldComputePreferred);
}
// Otherwise, if 'width' has a computed value of 'auto', and the element has
// an intrinsic width, then that intrinsic width is the used value of
// 'width'.
if (intrinsicSizingInfo.hasWidth)
return computeReplacedLogicalWidthRespectingMinMaxWidth(
LayoutUnit(constrainedSize.width()), shouldComputePreferred);
// Otherwise, if 'width' has a computed value of 'auto', but none of the
// conditions above are met, then the used value of 'width' becomes 300px.
// If 300px is too wide to fit the device, UAs should use the width of the
// largest rectangle that has a 2:1 ratio and fits the device instead.
// Note: We fall through and instead return intrinsicLogicalWidth() here -
// to preserve existing WebKit behavior, which might or might not be
// correct, or desired.
// Changing this to return cDefaultWidth, will affect lots of test results.
// Eg. some tests assume that a blank <img> tag (which implies
// width/height=auto) has no intrinsic size, which is wrong per CSS 2.1, but
// matches our behavior since a long time.
}
return computeReplacedLogicalWidthRespectingMinMaxWidth(
intrinsicLogicalWidth(), shouldComputePreferred);
}
