LayoutRect RenderReplaced::replacedContentRect(const LayoutSize& intrinsicSize) const
{
LayoutRect contentRect = contentBoxRect();
if (intrinsicSize.isEmpty())
return contentRect;
ObjectFit objectFit = style().objectFit();
LayoutRect finalRect = contentRect;
switch (objectFit) {
case ObjectFitContain:
case ObjectFitScaleDown:
case ObjectFitCover:
finalRect.setSize(finalRect.size().fitToAspectRatio(intrinsicSize, objectFit == ObjectFitCover ? AspectRatioFitGrow : AspectRatioFitShrink));
if (objectFit != ObjectFitScaleDown || finalRect.width() <= intrinsicSize.width())
break;
FALLTHROUGH;
case ObjectFitNone:
finalRect.setSize(intrinsicSize);
break;
case ObjectFitFill:
break;
}
LengthPoint objectPosition = style().objectPosition();
LayoutUnit xOffset = minimumValueForLength(objectPosition.x(), contentRect.width() - finalRect.width());
LayoutUnit yOffset = minimumValueForLength(objectPosition.y(), contentRect.height() - finalRect.height());
finalRect.move(xOffset, yOffset);
return finalRect;
}
LayoutUnit RenderReplaced::computeReplacedLogicalWidth(ShouldComputePreferred shouldComputePreferred) const
{
if (style()->logicalWidth().isSpecified() || style()->logicalWidth().isIntrinsic())
return computeReplacedLogicalWidthRespectingMinMaxWidth(computeReplacedLogicalWidthUsing(style()->logicalWidth()), shouldComputePreferred);
// 10.3.2 Inline, replaced elements: http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width
double intrinsicRatio = 0;
FloatSize constrainedSize;
computeAspectRatioInformationForRenderBox(constrainedSize, intrinsicRatio);
if (style()->logicalWidth().isAuto()) {
bool computedHeightIsAuto = hasAutoHeightOrContainingBlockWithAutoHeight();
bool hasIntrinsicWidth = constrainedSize.width() > 0;
// 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 && hasIntrinsicWidth)
return computeReplacedLogicalWidthRespectingMinMaxWidth(constrainedSize.width(), shouldComputePreferred);
bool hasIntrinsicHeight = constrainedSize.height() > 0;
if (intrinsicRatio) {
// 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 (intrinsicRatio && ((computedHeightIsAuto && !hasIntrinsicWidth && hasIntrinsicHeight) || !computedHeightIsAuto)) {
LayoutUnit logicalHeight = computeReplacedLogicalHeight();
return computeReplacedLogicalWidthRespectingMinMaxWidth(roundToInt(round(logicalHeight * intrinsicRatio)), 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 && !hasIntrinsicWidth && !hasIntrinsicHeight) {
if (shouldComputePreferred == ComputePreferred)
return 0;
// The aforementioned 'constraint equation' used for block-level, non-replaced elements in normal flow:
// 'margin-left' + 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' + 'margin-right' = width of containing block
LayoutUnit logicalWidth = containingBlock()->availableLogicalWidth();
// This solves above equation for 'width' (== logicalWidth).
LayoutUnit marginStart = minimumValueForLength(style()->marginStart(), logicalWidth);
LayoutUnit marginEnd = minimumValueForLength(style()->marginEnd(), logicalWidth);
logicalWidth = std::max<LayoutUnit>(0, logicalWidth - (marginStart + marginEnd + (width() - clientWidth())));
return computeReplacedLogicalWidthRespectingMinMaxWidth(logicalWidth, 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 (hasIntrinsicWidth)
return computeReplacedLogicalWidthRespectingMinMaxWidth(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);
}
Path HTMLAreaElement::getRegion(const LayoutSize& size) const
{
if (m_coords.isEmpty() && m_shape != Default)
return Path();
LayoutUnit width = size.width();
LayoutUnit height = size.height();
// If element omits the shape attribute, select shape based on number of coordinates.
Shape shape = m_shape;
if (shape == Unknown) {
if (m_coords.size() == 3)
shape = Circle;
else if (m_coords.size() == 4)
shape = Rect;
else if (m_coords.size() >= 6)
shape = Poly;
}
Path path;
switch (shape) {
case Poly:
if (m_coords.size() >= 6) {
int numPoints = m_coords.size() / 2;
path.moveTo(FloatPoint(minimumValueForLength(m_coords[0], width).toFloat(), minimumValueForLength(m_coords[1], height).toFloat()));
for (int i = 1; i < numPoints; ++i)
path.addLineTo(FloatPoint(minimumValueForLength(m_coords[i * 2], width).toFloat(), minimumValueForLength(m_coords[i * 2 + 1], height).toFloat()));
path.closeSubpath();
}
break;
case Circle:
if (m_coords.size() >= 3) {
Length radius = m_coords[2];
float r = std::min(minimumValueForLength(radius, width).toFloat(), minimumValueForLength(radius, height).toFloat());
path.addEllipse(FloatRect(minimumValueForLength(m_coords[0], width).toFloat() - r, minimumValueForLength(m_coords[1], height).toFloat() - r, 2 * r, 2 * r));
}
break;
case Rect:
if (m_coords.size() >= 4) {
float x0 = minimumValueForLength(m_coords[0], width).toFloat();
float y0 = minimumValueForLength(m_coords[1], height).toFloat();
float x1 = minimumValueForLength(m_coords[2], width).toFloat();
float y1 = minimumValueForLength(m_coords[3], height).toFloat();
path.addRect(FloatRect(x0, y0, x1 - x0, y1 - y0));
}
break;
case Default:
path.addRect(FloatRect(0, 0, width.toFloat(), height.toFloat()));
break;
case Unknown:
break;
}
return path;
}
LayoutRect LayoutReplaced::computeObjectFit(
const LayoutSize* overriddenIntrinsicSize) const {
LayoutRect contentRect = contentBoxRect();
ObjectFit objectFit = style()->getObjectFit();
if (objectFit == ObjectFitFill &&
style()->objectPosition() == ComputedStyle::initialObjectPosition()) {
return contentRect;
}
// TODO(davve): intrinsicSize doubles as both intrinsic size and intrinsic
// ratio. In the case of SVG images this isn't correct since they can have
// intrinsic ratio but no intrinsic size. In order to maintain aspect ratio,
// the intrinsic size for SVG might be faked from the aspect ratio,
// see SVGImage::containerSize().
LayoutSize intrinsicSize = overriddenIntrinsicSize ? *overriddenIntrinsicSize
: this->intrinsicSize();
if (!intrinsicSize.width() || !intrinsicSize.height())
return contentRect;
LayoutRect finalRect = contentRect;
switch (objectFit) {
case ObjectFitContain:
case ObjectFitScaleDown:
case ObjectFitCover:
finalRect.setSize(finalRect.size().fitToAspectRatio(
intrinsicSize, objectFit == ObjectFitCover ? AspectRatioFitGrow
: AspectRatioFitShrink));
if (objectFit != ObjectFitScaleDown ||
finalRect.width() <= intrinsicSize.width())
break;
// fall through
case ObjectFitNone:
finalRect.setSize(intrinsicSize);
break;
case ObjectFitFill:
break;
default:
ASSERT_NOT_REACHED();
}
LayoutUnit xOffset = minimumValueForLength(
style()->objectPosition().x(), contentRect.width() - finalRect.width());
LayoutUnit yOffset = minimumValueForLength(
style()->objectPosition().y(), contentRect.height() - finalRect.height());
finalRect.move(xOffset, yOffset);
return finalRect;
}
void RenderScrollbarPart::computeScrollbarWidth()
{
if (!m_scrollbar->owningRenderer())
return;
RenderView* renderView = view();
int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->borderLeft() - m_scrollbar->owningRenderer()->borderRight();
int w = calcScrollbarThicknessUsing(style()->width(), visibleSize, renderView);
int minWidth = calcScrollbarThicknessUsing(style()->minWidth(), visibleSize, renderView);
int maxWidth = style()->maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(style()->maxWidth(), visibleSize, renderView);
setWidth(max(minWidth, min(maxWidth, w)));
// Buttons and track pieces can all have margins along the axis of the scrollbar.
m_marginLeft = minimumValueForLength(style()->marginLeft(), visibleSize, renderView);
m_marginRight = minimumValueForLength(style()->marginRight(), visibleSize, renderView);
}
void RenderScrollbarPart::computeScrollbarHeight()
{
if (!m_scrollbar->owningRenderer())
return;
RenderView* renderView = view();
int visibleSize = m_scrollbar->owningRenderer()->height() - m_scrollbar->owningRenderer()->borderTop() - m_scrollbar->owningRenderer()->borderBottom();
int h = calcScrollbarThicknessUsing(style()->height(), visibleSize, renderView);
int minHeight = calcScrollbarThicknessUsing(style()->minHeight(), visibleSize, renderView);
int maxHeight = style()->maxHeight().isUndefined() ? h : calcScrollbarThicknessUsing(style()->maxHeight(), visibleSize, renderView);
setHeight(max(minHeight, min(maxHeight, h)));
// Buttons and track pieces can all have margins along the axis of the scrollbar.
m_marginTop = minimumValueForLength(style()->marginTop(), visibleSize, renderView);
m_marginBottom = minimumValueForLength(style()->marginBottom(), visibleSize, renderView);
}
LayoutUnit valueForLength(const Length& length, LayoutUnit maximumValue)
{
switch (length.type()) {
case Fixed:
case Percent:
case Calculated:
return minimumValueForLength(length, maximumValue);
case FillAvailable:
case Auto:
return maximumValue;
case Intrinsic:
case MinIntrinsic:
case MinContent:
case MaxContent:
case FitContent:
case ExtendToZoom:
case DeviceWidth:
case DeviceHeight:
case Undefined:
ASSERT_NOT_REACHED();
return 0;
}
ASSERT_NOT_REACHED();
return 0;
}
void LayoutScrollbarPart::computeScrollbarHeight()
{
if (!m_scrollbar->owningLayoutObject())
return;
// FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
// FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
int visibleSize = m_scrollbar->owningLayoutObject()->size().height() - m_scrollbar->owningLayoutObject()->style()->borderTopWidth() - m_scrollbar->owningLayoutObject()->style()->borderBottomWidth();
int h = calcScrollbarThicknessUsing(MainOrPreferredSize, style()->height(), visibleSize);
int minHeight = calcScrollbarThicknessUsing(MinSize, style()->minHeight(), visibleSize);
int maxHeight = style()->maxHeight().isMaxSizeNone() ? h : calcScrollbarThicknessUsing(MaxSize, style()->maxHeight(), visibleSize);
setHeight(std::max(minHeight, std::min(maxHeight, h)));
// Buttons and track pieces can all have margins along the axis of the scrollbar.
setMarginTop(minimumValueForLength(style()->marginTop(), visibleSize));
setMarginBottom(minimumValueForLength(style()->marginBottom(), visibleSize));
}
LayoutUnit valueForLength(const Length& length, LayoutUnit maximumValue, RenderView* renderView, bool roundPercentages)
{
switch (length.type()) {
case Fixed:
case Percent:
case Calculated:
case ViewportPercentageWidth:
case ViewportPercentageHeight:
case ViewportPercentageMin:
case ViewportPercentageMax:
return minimumValueForLength(length, maximumValue, renderView, roundPercentages);
case FillAvailable:
case Auto:
return maximumValue;
case Relative:
case Intrinsic:
case MinIntrinsic:
case MinContent:
case MaxContent:
case FitContent:
case Undefined:
ASSERT_NOT_REACHED();
return 0;
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBoxModelObject::computedCSSPadding(const Length& padding) const
{
LayoutUnit w = 0;
if (padding.isPercent())
w = containingBlockLogicalWidthForContent();
return minimumValueForLength(padding, w);
}
void RenderScrollbarPart::computeScrollbarWidth()
{
if (!m_scrollbar->owningRenderer())
return;
// FIXME: We are querying layout information but nothing guarantees that it's up-to-date, especially since we are called at style change.
// FIXME: Querying the style's border information doesn't work on table cells with collapsing borders.
int visibleSize = m_scrollbar->owningRenderer()->width() - m_scrollbar->owningRenderer()->style().borderLeftWidth() - m_scrollbar->owningRenderer()->style().borderRightWidth();
int w = calcScrollbarThicknessUsing(MainOrPreferredSize, style().width(), visibleSize);
int minWidth = calcScrollbarThicknessUsing(MinSize, style().minWidth(), visibleSize);
int maxWidth = style().maxWidth().isUndefined() ? w : calcScrollbarThicknessUsing(MaxSize, style().maxWidth(), visibleSize);
setWidth(std::max(minWidth, std::min(maxWidth, w)));
// Buttons and track pieces can all have margins along the axis of the scrollbar.
m_marginBox.setLeft(minimumValueForLength(style().marginLeft(), visibleSize));
m_marginBox.setRight(minimumValueForLength(style().marginRight(), visibleSize));
}
LayoutRect RenderReplaced::replacedContentRect(const LayoutSize* overriddenIntrinsicSize) const
{
LayoutRect contentRect = contentBoxRect();
ObjectFit objectFit = style()->objectFit();
if (objectFit == ObjectFitFill && style()->objectPosition() == RenderStyle::initialObjectPosition()) {
if (RuntimeEnabledFeatures::objectFitPositionEnabled())
return contentRect;
objectFit = ObjectFitContain;
}
LayoutSize intrinsicSize = overriddenIntrinsicSize ? *overriddenIntrinsicSize : this->intrinsicSize();
if (!intrinsicSize.width() || !intrinsicSize.height())
return contentRect;
LayoutRect finalRect = contentRect;
switch (objectFit) {
case ObjectFitContain:
case ObjectFitScaleDown:
case ObjectFitCover:
finalRect.setSize(finalRect.size().fitToAspectRatio(intrinsicSize, objectFit == ObjectFitCover ? AspectRatioFitGrow : AspectRatioFitShrink));
if (objectFit != ObjectFitScaleDown || finalRect.width() <= intrinsicSize.width())
break;
// fall through
case ObjectFitNone:
finalRect.setSize(intrinsicSize);
break;
case ObjectFitFill:
break;
default:
ASSERT_NOT_REACHED();
}
LayoutUnit xOffset = minimumValueForLength(style()->objectPosition().x(), contentRect.width() - finalRect.width());
LayoutUnit yOffset = minimumValueForLength(style()->objectPosition().y(), contentRect.height() - finalRect.height());
finalRect.move(xOffset, yOffset);
return finalRect;
}
LayoutUnit LayoutReplaced::computeConstrainedLogicalWidth(
ShouldComputePreferred shouldComputePreferred) const {
if (shouldComputePreferred == ComputePreferred)
return computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit(),
ComputePreferred);
// The aforementioned 'constraint equation' used for block-level, non-replaced
// elements in normal flow:
// 'margin-left' + 'border-left-width' + 'padding-left' + 'width' +
// 'padding-right' + 'border-right-width' + 'margin-right' = width of
// containing block
LayoutUnit logicalWidth = containingBlock()->availableLogicalWidth();
// This solves above equation for 'width' (== logicalWidth).
LayoutUnit marginStart =
minimumValueForLength(style()->marginStart(), logicalWidth);
LayoutUnit marginEnd =
minimumValueForLength(style()->marginEnd(), logicalWidth);
logicalWidth = (logicalWidth -
(marginStart + marginEnd + (size().width() - clientWidth())))
.clampNegativeToZero();
return computeReplacedLogicalWidthRespectingMinMaxWidth(
logicalWidth, shouldComputePreferred);
}
bool TextAutoSizingValue::adjustNodeSizes()
{
bool objectsRemoved = false;
// Remove stale nodes. Nodes may have had their renderers detached. We'll
// also need to remove the style from the documents m_textAutoSizedNodes
// collection. Return true indicates we need to do that removal.
Vector<RefPtr<Node> > nodesForRemoval;
HashSet<RefPtr<Node> >::iterator end = m_autoSizedNodes.end();
for (HashSet<RefPtr<Node> >::iterator i = m_autoSizedNodes.begin(); i != end; ++i) {
RefPtr<Node> autoSizingNode = *i;
RenderText* text = static_cast<RenderText*>(autoSizingNode->renderer());
if (!text || !text->style().textSizeAdjust().isAuto() || !text->candidateComputedTextSize()) {
// remove node.
nodesForRemoval.append(autoSizingNode);
objectsRemoved = true;
}
}
unsigned count = nodesForRemoval.size();
for (unsigned i = 0; i < count; i++)
m_autoSizedNodes.remove(nodesForRemoval[i]);
// If we only have one piece of text with the style on the page don't
// adjust it's size.
if (m_autoSizedNodes.size() <= 1)
return objectsRemoved;
// Compute average size
float cumulativeSize = 0;
end = m_autoSizedNodes.end();
for (HashSet<RefPtr<Node> >::iterator i = m_autoSizedNodes.begin(); i != end; ++i) {
RefPtr<Node> autoSizingNode = *i;
RenderText* renderText = static_cast<RenderText*>(autoSizingNode->renderer());
cumulativeSize += renderText->candidateComputedTextSize();
}
float averageSize = roundf(cumulativeSize / m_autoSizedNodes.size());
// Adjust sizes
bool firstPass = true;
end = m_autoSizedNodes.end();
for (HashSet<RefPtr<Node> >::iterator i = m_autoSizedNodes.begin(); i != end; ++i) {
const RefPtr<Node>& autoSizingNode = *i;
RenderText* text = static_cast<RenderText*>(autoSizingNode->renderer());
if (text && text->style().fontDescription().computedSize() != averageSize) {
float specifiedSize = text->style().fontDescription().specifiedSize();
float scaleChange = averageSize / specifiedSize;
if (scaleChange > MAX_SCALE_INCREASE && firstPass) {
firstPass = false;
averageSize = roundf(specifiedSize * MAX_SCALE_INCREASE);
scaleChange = averageSize / specifiedSize;
}
RefPtr<RenderStyle> style = cloneRenderStyleWithState(text->style());
FontDescription fontDescription = style->fontDescription();
fontDescription.setComputedSize(averageSize);
style->setFontDescription(fontDescription);
style->font().update(autoSizingNode->document().ensureStyleResolver().fontSelector());
text->parent()->setStyle(style.releaseNonNull());
RenderElement* parentRenderer = text->parent();
if (parentRenderer->isAnonymousBlock())
parentRenderer = parentRenderer->parent();
// If we have a list we should resize ListMarkers separately.
RenderObject* listMarkerRenderer = parentRenderer->firstChild();
if (listMarkerRenderer->isListMarker()) {
RefPtr<RenderStyle> style = cloneRenderStyleWithState(listMarkerRenderer->style());
style->setFontDescription(fontDescription);
style->font().update(autoSizingNode->document().ensureStyleResolver().fontSelector());
toRenderListMarker(*listMarkerRenderer).setStyle(style.releaseNonNull());
}
// Resize the line height of the parent.
const RenderStyle& parentStyle = parentRenderer->style();
Length lineHeightLength = parentStyle.specifiedLineHeight();
int specifiedLineHeight = 0;
if (lineHeightLength.isPercent())
specifiedLineHeight = minimumValueForLength(lineHeightLength, fontDescription.specifiedSize());
else
specifiedLineHeight = lineHeightLength.value();
int lineHeight = specifiedLineHeight * scaleChange;
if (!lineHeightLength.isFixed() || lineHeightLength.value() != lineHeight) {
RefPtr<RenderStyle> newParentStyle = cloneRenderStyleWithState(parentStyle);
newParentStyle->setLineHeight(Length(lineHeight, Fixed));
newParentStyle->setSpecifiedLineHeight(lineHeightLength);
newParentStyle->setFontDescription(fontDescription);
newParentStyle->font().update(autoSizingNode->document().ensureStyleResolver().fontSelector());
parentRenderer->setStyle(newParentStyle.releaseNonNull());
}
}
}
return objectsRemoved;
}
static int calcScrollbarThicknessUsing(SizeType sizeType, const Length& length, int containingLength)
{
if (!length.isIntrinsicOrAuto() || (sizeType == MinSize && length.isAuto()))
return minimumValueForLength(length, containingLength);
return ScrollbarTheme::theme()->scrollbarThickness();
}
int minimumIntValueForLength(const Length& length, LayoutUnit maximumValue, RenderView* renderView, bool roundPercentages)
{
return static_cast<int>(minimumValueForLength(length, maximumValue, renderView, roundPercentages));
}
LayoutUnit roundedMinimumValueForLength(const Length& length, LayoutUnit maximumValue)
{
if (length.type() == Percent)
return static_cast<LayoutUnit>(round(maximumValue * length.percent() / 100.0f));
return minimumValueForLength(length, maximumValue);
}
static int calcScrollbarThicknessUsing(const Length& length, int containingLength, RenderView* renderView)
{
if (length.isIntrinsicOrAuto())
return ScrollbarTheme::theme()->scrollbarThickness();
return minimumValueForLength(length, containingLength, renderView);
}
LayoutUnit RenderReplaced::computeReplacedLogicalWidth(bool includeMaxWidth) const
{
if (style()->logicalWidth().isSpecified())
return computeReplacedLogicalWidthRespectingMinMaxWidth(computeReplacedLogicalWidthUsing(style()->logicalWidth()), includeMaxWidth);
RenderBox* contentRenderer = embeddedContentBox();
// 10.3.2 Inline, replaced elements: http://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width
bool isPercentageIntrinsicSize = false;
double intrinsicRatio = 0;
FloatSize intrinsicSize;
computeIntrinsicRatioInformationForRenderBox(contentRenderer, intrinsicSize, intrinsicRatio, isPercentageIntrinsicSize);
// FIXME: Remove unnecessary round/roundToInt calls from this method when layout is off ints: webkit.org/b/63656
if (style()->logicalWidth().isAuto()) {
bool heightIsAuto = style()->logicalHeight().isAuto();
bool hasIntrinsicWidth = !isPercentageIntrinsicSize && intrinsicSize.width() > 0;
// 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 (heightIsAuto && hasIntrinsicWidth)
return computeReplacedLogicalWidthRespectingMinMaxWidth(roundToInt(intrinsicSize.width()), includeMaxWidth);
bool hasIntrinsicHeight = !isPercentageIntrinsicSize && intrinsicSize.height() > 0;
if (intrinsicRatio || isPercentageIntrinsicSize) {
// 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 (intrinsicRatio && ((heightIsAuto && !hasIntrinsicWidth && hasIntrinsicHeight) || !heightIsAuto)) {
LayoutUnit logicalHeight = computeReplacedLogicalHeightUsing(style()->logicalHeight());
return computeReplacedLogicalWidthRespectingMinMaxWidth(roundToInt(round(logicalHeight * intrinsicRatio)));
}
// 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 (heightIsAuto && !hasIntrinsicWidth && !hasIntrinsicHeight && contentRenderer) {
// The aforementioned 'constraint equation' used for block-level, non-replaced elements in normal flow:
// 'margin-left' + 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' + 'margin-right' = width of containing block
LayoutUnit logicalWidth;
if (RenderBlock* blockWithWidth = firstContainingBlockWithLogicalWidth(this))
logicalWidth = blockWithWidth->computeReplacedLogicalWidthRespectingMinMaxWidth(blockWithWidth->computeReplacedLogicalWidthUsing(blockWithWidth->style()->logicalWidth()), false);
else
logicalWidth = containingBlock()->availableLogicalWidth();
// This solves above equation for 'width' (== logicalWidth).
LayoutUnit marginStart = minimumValueForLength(style()->marginStart(), logicalWidth);
LayoutUnit marginEnd = minimumValueForLength(style()->marginEnd(), logicalWidth);
logicalWidth = max(ZERO_LAYOUT_UNIT, logicalWidth - (marginStart + marginEnd + (width() - clientWidth())));
if (isPercentageIntrinsicSize)
logicalWidth = roundToInt(logicalWidth * intrinsicSize.width() / 100);
return computeReplacedLogicalWidthRespectingMinMaxWidth(logicalWidth, includeMaxWidth);
}
}
// 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 (hasIntrinsicWidth)
return computeReplacedLogicalWidthRespectingMinMaxWidth(roundToInt(intrinsicSize.width()), includeMaxWidth);
// 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(), includeMaxWidth);
}
