LayoutUnit LayoutReplaced::computeReplacedLogicalHeight(
LayoutUnit estimatedUsedWidth) const {
// 10.5 Content height: the 'height' property:
// http://www.w3.org/TR/CSS21/visudet.html#propdef-height
if (hasReplacedLogicalHeight())
return computeReplacedLogicalHeightRespectingMinMaxHeight(
computeReplacedLogicalHeightUsing(MainOrPreferredSize,
style()->logicalHeight()));
LayoutReplaced* contentLayoutObject = embeddedReplacedContent();
// 10.6.2 Inline, replaced elements:
// http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-height
IntrinsicSizingInfo intrinsicSizingInfo;
computeIntrinsicSizingInfoForReplacedContent(contentLayoutObject,
intrinsicSizingInfo);
FloatSize constrainedSize =
constrainIntrinsicSizeToMinMax(intrinsicSizingInfo);
bool widthIsAuto = style()->logicalWidth().isAuto();
// If 'height' and 'width' both have computed values of 'auto' and the element
// also has an intrinsic height, then that intrinsic height is the used value
// of 'height'.
if (widthIsAuto && intrinsicSizingInfo.hasHeight)
return computeReplacedLogicalHeightRespectingMinMaxHeight(
LayoutUnit(constrainedSize.height()));
// Otherwise, if 'height' has a computed value of 'auto', and the element has
// an intrinsic ratio then the used value of 'height' is:
// (used width) / (intrinsic ratio)
if (!intrinsicSizingInfo.aspectRatio.isEmpty()) {
LayoutUnit usedWidth =
estimatedUsedWidth ? estimatedUsedWidth : availableLogicalWidth();
return computeReplacedLogicalHeightRespectingMinMaxHeight(
resolveHeightForRatio(usedWidth, intrinsicSizingInfo.aspectRatio));
}
// Otherwise, if 'height' has a computed value of 'auto', and the element has
// an intrinsic height, then that intrinsic height is the used value of
// 'height'.
if (intrinsicSizingInfo.hasHeight)
return computeReplacedLogicalHeightRespectingMinMaxHeight(
LayoutUnit(constrainedSize.height()));
// Otherwise, if 'height' has a computed value of 'auto', but none of the
// conditions above are met, then the used value of 'height' must be set to
// the height of the largest rectangle that has a 2:1 ratio, has a height not
// greater than 150px, and has a width not greater than the device width.
return computeReplacedLogicalHeightRespectingMinMaxHeight(
intrinsicLogicalHeight());
}
void LayoutReplaced::computeIntrinsicSizingInfo(
IntrinsicSizingInfo& intrinsicSizingInfo) const {
// If there's an embeddedReplacedContent() of a remote, referenced document
// available, this code-path should never be used.
ASSERT(!embeddedReplacedContent());
intrinsicSizingInfo.size = FloatSize(intrinsicLogicalWidth().toFloat(),
intrinsicLogicalHeight().toFloat());
// Figure out if we need to compute an intrinsic ratio.
if (intrinsicSizingInfo.size.isEmpty() || !layoutObjectHasAspectRatio(this))
return;
intrinsicSizingInfo.aspectRatio = intrinsicSizingInfo.size;
}
bool LayoutPart::needsPreferredWidthsRecalculation() const
{
if (LayoutReplaced::needsPreferredWidthsRecalculation())
return true;
return embeddedReplacedContent();
}
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);
}
