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* Copyright (C) 1999 Lars Knoll (
* Copyright (C) 2000 Dirk Mueller (
* Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
#include "config.h"
#include "core/rendering/RenderReplaced.h"
#include "core/editing/PositionWithAffinity.h"
#include "core/paint/ReplacedPainter.h"
#include "core/rendering/GraphicsContextAnnotator.h"
#include "core/rendering/RenderBlock.h"
#include "core/rendering/RenderImage.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderView.h"
#include "platform/LengthFunctions.h"
#include "platform/graphics/GraphicsContext.h"
namespace blink {
const int RenderReplaced::defaultWidth = 300;
const int RenderReplaced::defaultHeight = 150;
RenderReplaced::RenderReplaced(Element* element)
: RenderBox(element)
, m_intrinsicSize(defaultWidth, defaultHeight)
RenderReplaced::RenderReplaced(Element* element, const LayoutSize& intrinsicSize)
: RenderBox(element)
, m_intrinsicSize(intrinsicSize)
void RenderReplaced::willBeDestroyed()
if (!documentBeingDestroyed() && parent())
void RenderReplaced::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
RenderBox::styleDidChange(diff, oldStyle);
bool hadStyle = (oldStyle != 0);
float oldZoom = hadStyle ? oldStyle->effectiveZoom() : RenderStyle::initialZoom();
if (style() && style()->effectiveZoom() != oldZoom)
void RenderReplaced::layout()
LayoutRect oldContentRect = replacedContentRect();
if (replacedContentRect() != oldContentRect)
void RenderReplaced::intrinsicSizeChanged()
int scaledWidth = static_cast<int>(defaultWidth * style()->effectiveZoom());
int scaledHeight = static_cast<int>(defaultHeight * style()->effectiveZoom());
m_intrinsicSize = IntSize(scaledWidth, scaledHeight);
void RenderReplaced::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
ReplacedPainter(*this).paint(paintInfo, paintOffset);
bool RenderReplaced::shouldPaint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
if (paintInfo.phase != PaintPhaseForeground && paintInfo.phase != PaintPhaseOutline && paintInfo.phase != PaintPhaseSelfOutline
&& paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseMask && paintInfo.phase != PaintPhaseClippingMask)
return false;
if (!paintInfo.shouldPaintWithinRoot(this))
return false;
// if we're invisible or haven't received a layout yet, then just bail.
if (style()->visibility() != VISIBLE)
return false;
LayoutPoint adjustedPaintOffset = paintOffset + location();
// Early exit if the element touches the edges.
LayoutUnit top = adjustedPaintOffset.y() + visualOverflowRect().y();
LayoutUnit bottom = adjustedPaintOffset.y() + visualOverflowRect().maxY();
if (isSelected() && inlineBoxWrapper()) {
LayoutUnit selTop = paintOffset.y() + inlineBoxWrapper()->root().selectionTop();
LayoutUnit selBottom = paintOffset.y() + selTop + inlineBoxWrapper()->root().selectionHeight();
top = std::min(selTop, top);
bottom = std::max(selBottom, bottom);
if (adjustedPaintOffset.x() + visualOverflowRect().x() >= paintInfo.rect.maxX() || adjustedPaintOffset.x() + visualOverflowRect().maxX() <= paintInfo.rect.x())
return false;
if (top >= paintInfo.rect.maxY() || bottom <= paintInfo.rect.y())
return false;
return true;
bool RenderReplaced::hasReplacedLogicalHeight() const
if (style()->logicalHeight().isAuto())
return false;
if (style()->logicalHeight().isSpecified()) {
if (hasAutoHeightOrContainingBlockWithAutoHeight())
return false;
return true;
if (style()->logicalHeight().isIntrinsic())
return true;
return false;
bool RenderReplaced::needsPreferredWidthsRecalculation() const
// If the height is a percentage and the width is auto, then the containingBlocks's height changing can cause
// this node to change it's preferred width because it maintains aspect ratio.
return hasRelativeLogicalHeight() && style()->logicalWidth().isAuto() && !hasAutoHeightOrContainingBlockWithAutoHeight();
static inline bool rendererHasAspectRatio(const RenderObject* renderer)
return renderer->isImage() || renderer->isCanvas() || renderer->isVideo();
void RenderReplaced::computeAspectRatioInformationForRenderBox(RenderBox* contentRenderer, FloatSize& constrainedSize, double& intrinsicRatio) const
FloatSize intrinsicSize;
if (contentRenderer) {
contentRenderer->computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
// Handle zoom & vertical writing modes here, as the embedded document doesn't know about them.
if (isRenderImage())
// 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 && !intrinsicSize.isEmpty())
m_intrinsicSize = LayoutSize(intrinsicSize);
if (!isHorizontalWritingMode()) {
if (intrinsicRatio)
intrinsicRatio = 1 / intrinsicRatio;
intrinsicSize = intrinsicSize.transposedSize();
} else {
computeIntrinsicRatioInformation(intrinsicSize, intrinsicRatio);
if (intrinsicRatio && !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 && !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());
LayoutRect RenderReplaced::replacedContentRect(const LayoutSize* overriddenIntrinsicSize) const
LayoutRect contentRect = contentBoxRect();
ObjectFit objectFit = style()->objectFit();
if (objectFit == ObjectFitFill && style()->objectPosition() == RenderStyle::initialObjectPosition()) {
return contentRect;
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())
// fall through
case ObjectFitNone:
case ObjectFitFill:
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 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.
intrinsicSize = FloatSize(intrinsicLogicalWidth().toFloat(), intrinsicLogicalHeight().toFloat());
// Figure out if we need to compute an intrinsic ratio.
if (intrinsicSize.isEmpty() || !rendererHasAspectRatio(this))
intrinsicRatio = intrinsicSize.width() / intrinsicSize.height();
LayoutUnit RenderReplaced::computeReplacedLogicalWidth(ShouldComputePreferred shouldComputePreferred) const
if (style()->logicalWidth().isSpecified() || style()->logicalWidth().isIntrinsic())
return computeReplacedLogicalWidthRespectingMinMaxWidth(computeReplacedLogicalWidthUsing(style()->logicalWidth()), shouldComputePreferred);
RenderBox* contentRenderer = embeddedContentBox();
// 10.3.2 Inline, replaced elements:
double intrinsicRatio = 0;
FloatSize constrainedSize;
computeAspectRatioInformationForRenderBox(contentRenderer, 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);
LayoutUnit RenderReplaced::computeReplacedLogicalHeight() const
// 10.5 Content height: the 'height' property:
if (hasReplacedLogicalHeight())
return computeReplacedLogicalHeightRespectingMinMaxHeight(computeReplacedLogicalHeightUsing(style()->logicalHeight()));
RenderBox* contentRenderer = embeddedContentBox();
// 10.6.2 Inline, replaced elements:
double intrinsicRatio = 0;
FloatSize constrainedSize;
computeAspectRatioInformationForRenderBox(contentRenderer, constrainedSize, intrinsicRatio);
bool widthIsAuto = style()->logicalWidth().isAuto();
bool hasIntrinsicHeight = constrainedSize.height() > 0;
// 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 && hasIntrinsicHeight)
return computeReplacedLogicalHeightRespectingMinMaxHeight(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 (intrinsicRatio)
return computeReplacedLogicalHeightRespectingMinMaxHeight(roundToInt(round(availableLogicalWidth() / intrinsicRatio)));
// 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 (hasIntrinsicHeight)
return computeReplacedLogicalHeightRespectingMinMaxHeight(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 RenderReplaced::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
minLogicalWidth = maxLogicalWidth = intrinsicLogicalWidth();
void RenderReplaced::computePreferredLogicalWidths()
// We cannot resolve any percent logical width here as the available logical
// width may not be set on our containing block.
if (style()->logicalWidth().isPercent())
computeIntrinsicLogicalWidths(m_minPreferredLogicalWidth, m_maxPreferredLogicalWidth);
m_minPreferredLogicalWidth = m_maxPreferredLogicalWidth = computeReplacedLogicalWidth(ComputePreferred);
RenderStyle* styleToUse = style();
if (styleToUse->logicalWidth().isPercent() || styleToUse->logicalMaxWidth().isPercent())
m_minPreferredLogicalWidth = 0;
if (styleToUse->logicalMinWidth().isFixed() && styleToUse->logicalMinWidth().value() > 0) {
m_maxPreferredLogicalWidth = std::max(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));
m_minPreferredLogicalWidth = std::max(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMinWidth().value()));
if (styleToUse->logicalMaxWidth().isFixed()) {
m_maxPreferredLogicalWidth = std::min(m_maxPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMaxWidth().value()));
m_minPreferredLogicalWidth = std::min(m_minPreferredLogicalWidth, adjustContentBoxLogicalWidthForBoxSizing(styleToUse->logicalMaxWidth().value()));
LayoutUnit borderAndPadding = borderAndPaddingLogicalWidth();
m_minPreferredLogicalWidth += borderAndPadding;
m_maxPreferredLogicalWidth += borderAndPadding;
PositionWithAffinity RenderReplaced::positionForPoint(const LayoutPoint& point)
// FIXME: This code is buggy if the replaced element is relative positioned.
InlineBox* box = inlineBoxWrapper();
RootInlineBox* rootBox = box ? &box->root() : 0;
LayoutUnit top = rootBox ? rootBox->selectionTop() : logicalTop();
LayoutUnit bottom = rootBox ? rootBox->selectionBottom() : logicalBottom();
LayoutUnit blockDirectionPosition = isHorizontalWritingMode() ? point.y() + y() : point.x() + x();
LayoutUnit lineDirectionPosition = isHorizontalWritingMode() ? point.x() + x() : point.y() + y();
if (blockDirectionPosition < top)
return createPositionWithAffinity(caretMinOffset(), DOWNSTREAM); // coordinates are above
if (blockDirectionPosition >= bottom)
return createPositionWithAffinity(caretMaxOffset(), DOWNSTREAM); // coordinates are below
if (node()) {
if (lineDirectionPosition <= logicalLeft() + (logicalWidth() / 2))
return createPositionWithAffinity(0, DOWNSTREAM);
return createPositionWithAffinity(1, DOWNSTREAM);
return RenderBox::positionForPoint(point);
LayoutRect RenderReplaced::selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const
if (!isSelected())
return LayoutRect();
LayoutRect rect = localSelectionRect();
mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, 0);
return rect;
LayoutRect RenderReplaced::localSelectionRect(bool checkWhetherSelected) const
if (checkWhetherSelected && !isSelected())
return LayoutRect();
if (!inlineBoxWrapper())
// We're a block-level replaced element. Just return our own dimensions.
return LayoutRect(LayoutPoint(), size());
RootInlineBox& root = inlineBoxWrapper()->root();
LayoutUnit newLogicalTop = root.block().style()->slowIsFlippedBlocksWritingMode() ? inlineBoxWrapper()->logicalBottom() - root.selectionBottom() : root.selectionTop() - inlineBoxWrapper()->logicalTop();
if (root.block().style()->isHorizontalWritingMode())
return LayoutRect(0, newLogicalTop, width(), root.selectionHeight());
return LayoutRect(newLogicalTop, 0, root.selectionHeight(), height());
void RenderReplaced::setSelectionState(SelectionState state)
// The selection state for our containing block hierarchy is updated by the base class call.
if (!inlineBoxWrapper())
// We only include the space below the baseline in our layer's cached paint invalidation rect if the
// image is selected. Since the selection state has changed update the rect.
if (hasLayer())
if (canUpdateSelectionOnRootLineBoxes())
bool RenderReplaced::isSelected() const
SelectionState s = selectionState();
if (s == SelectionNone)
return false;
if (s == SelectionInside)
return true;
int selectionStart, selectionEnd;
selectionStartEnd(selectionStart, selectionEnd);
if (s == SelectionStart)
return selectionStart == 0;
int end = node()->hasChildren() ? node()->countChildren() : 1;
if (s == SelectionEnd)
return selectionEnd == end;
if (s == SelectionBoth)
return selectionStart == 0 && selectionEnd == end;
return false;
LayoutRect RenderReplaced::clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState) const
if (style()->visibility() != VISIBLE && !enclosingLayer()->hasVisibleContent())
return LayoutRect();
// The selectionRect can project outside of the overflowRect, so take their union
// for paint invalidation to avoid selection painting glitches.
LayoutRect r = isSelected() ? localSelectionRect() : visualOverflowRect();
mapRectToPaintInvalidationBacking(paintInvalidationContainer, r, paintInvalidationState);
return r;