/
RenderBox.cpp
3488 lines (2994 loc) · 154 KB
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RenderBox.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* 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 "RenderBox.h"
#include "CachedImage.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "Document.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HitTestResult.h"
#include "htmlediting.h"
#include "HTMLElement.h"
#include "HTMLNames.h"
#include "ImageBuffer.h"
#include "FloatQuad.h"
#include "Frame.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderArena.h"
#include "RenderFlexibleBox.h"
#include "RenderInline.h"
#include "RenderLayer.h"
#include "RenderTableCell.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "ScrollbarTheme.h"
#include "TransformState.h"
#include <algorithm>
#include <math.h>
using namespace std;
namespace WebCore {
using namespace HTMLNames;
// Used by flexible boxes when flexing this element.
typedef WTF::HashMap<const RenderBox*, int> OverrideSizeMap;
static OverrideSizeMap* gOverrideSizeMap = 0;
bool RenderBox::s_hadOverflowClip = false;
RenderBox::RenderBox(Node* node)
: RenderBoxModelObject(node)
, m_marginLeft(0)
, m_marginRight(0)
, m_marginTop(0)
, m_marginBottom(0)
, m_minPreferredLogicalWidth(-1)
, m_maxPreferredLogicalWidth(-1)
, m_inlineBoxWrapper(0)
{
setIsBox();
}
RenderBox::~RenderBox()
{
}
int RenderBox::marginBefore() const
{
switch (style()->writingMode()) {
case TopToBottomWritingMode:
return m_marginTop;
case BottomToTopWritingMode:
return m_marginBottom;
case LeftToRightWritingMode:
return m_marginLeft;
case RightToLeftWritingMode:
return m_marginRight;
}
ASSERT_NOT_REACHED();
return m_marginTop;
}
int RenderBox::marginAfter() const
{
switch (style()->writingMode()) {
case TopToBottomWritingMode:
return m_marginBottom;
case BottomToTopWritingMode:
return m_marginTop;
case LeftToRightWritingMode:
return m_marginRight;
case RightToLeftWritingMode:
return m_marginLeft;
}
ASSERT_NOT_REACHED();
return m_marginBottom;
}
int RenderBox::marginStart() const
{
if (isHorizontalWritingMode())
return style()->isLeftToRightDirection() ? m_marginLeft : m_marginRight;
return style()->isLeftToRightDirection() ? m_marginTop : m_marginBottom;
}
int RenderBox::marginEnd() const
{
if (isHorizontalWritingMode())
return style()->isLeftToRightDirection() ? m_marginRight : m_marginLeft;
return style()->isLeftToRightDirection() ? m_marginBottom : m_marginTop;
}
void RenderBox::setMarginStart(int margin)
{
if (isHorizontalWritingMode()) {
if (style()->isLeftToRightDirection())
m_marginLeft = margin;
else
m_marginRight = margin;
} else {
if (style()->isLeftToRightDirection())
m_marginTop = margin;
else
m_marginBottom = margin;
}
}
void RenderBox::setMarginEnd(int margin)
{
if (isHorizontalWritingMode()) {
if (style()->isLeftToRightDirection())
m_marginRight = margin;
else
m_marginLeft = margin;
} else {
if (style()->isLeftToRightDirection())
m_marginBottom = margin;
else
m_marginTop = margin;
}
}
void RenderBox::setMarginBefore(int margin)
{
switch (style()->writingMode()) {
case TopToBottomWritingMode:
m_marginTop = margin;
break;
case BottomToTopWritingMode:
m_marginBottom = margin;
break;
case LeftToRightWritingMode:
m_marginLeft = margin;
break;
case RightToLeftWritingMode:
m_marginRight = margin;
break;
}
}
void RenderBox::setMarginAfter(int margin)
{
switch (style()->writingMode()) {
case TopToBottomWritingMode:
m_marginBottom = margin;
break;
case BottomToTopWritingMode:
m_marginTop = margin;
break;
case LeftToRightWritingMode:
m_marginRight = margin;
break;
case RightToLeftWritingMode:
m_marginLeft = margin;
break;
}
}
void RenderBox::destroy()
{
// A lot of the code in this function is just pasted into
// RenderWidget::destroy. If anything in this function changes,
// be sure to fix RenderWidget::destroy() as well.
if (hasOverrideSize())
gOverrideSizeMap->remove(this);
if (style() && (style()->logicalHeight().isPercent() || style()->logicalMinHeight().isPercent() || style()->logicalMaxHeight().isPercent()))
RenderBlock::removePercentHeightDescendant(this);
RenderBoxModelObject::destroy();
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrPositioned());
if (documentBeingDestroyed())
return;
if (isFloating()) {
RenderBlock* parentBlock = 0;
for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
if (curr->isRenderBlock()) {
RenderBlock* currBlock = toRenderBlock(curr);
if (currBlock->containsFloat(this))
parentBlock = currBlock;
}
}
if (parentBlock) {
RenderObject* parent = parentBlock->parent();
if (parent && parent->isFlexibleBox())
parentBlock = toRenderBlock(parent);
parentBlock->markAllDescendantsWithFloatsForLayout(this, false);
}
}
if (isPositioned()) {
for (RenderObject* curr = parent(); curr; curr = curr->parent()) {
if (curr->isRenderBlock())
toRenderBlock(curr)->removePositionedObject(this);
}
}
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
{
s_hadOverflowClip = hasOverflowClip();
if (style()) {
// The background of the root element or the body element could propagate up to
// the canvas. Just dirty the entire canvas when our style changes substantially.
if (diff >= StyleDifferenceRepaint && node() &&
(node()->hasTagName(htmlTag) || node()->hasTagName(bodyTag)))
view()->repaint();
// When a layout hint happens and an object's position style changes, we have to do a layout
// to dirty the render tree using the old position value now.
if (diff == StyleDifferenceLayout && parent() && style()->position() != newStyle->position()) {
markContainingBlocksForLayout();
if (style()->position() == StaticPosition)
repaint();
else if (newStyle->position() == AbsolutePosition || newStyle->position() == FixedPosition)
parent()->setChildNeedsLayout(true);
if (isFloating() && !isPositioned() && (newStyle->position() == AbsolutePosition || newStyle->position() == FixedPosition))
removeFloatingOrPositionedChildFromBlockLists();
}
} else if (newStyle && isBody())
view()->repaint();
if (FrameView *frameView = view()->frameView()) {
bool newStyleIsFixed = newStyle && newStyle->position() == FixedPosition;
bool oldStyleIsFixed = style() && style()->position() == FixedPosition;
if (newStyleIsFixed != oldStyleIsFixed) {
if (newStyleIsFixed)
frameView->addFixedObject();
else
frameView->removeFixedObject();
}
}
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderBoxModelObject::styleDidChange(diff, oldStyle);
if (needsLayout() && oldStyle) {
if (oldStyle && (oldStyle->logicalHeight().isPercent() || oldStyle->logicalMinHeight().isPercent() || oldStyle->logicalMaxHeight().isPercent()))
RenderBlock::removePercentHeightDescendant(this);
// Normally we can do optimized positioning layout for absolute/fixed positioned objects. There is one special case, however, which is
// when the positioned object's margin-before is changed. In this case the parent has to get a layout in order to run margin collapsing
// to determine the new static position.
if (isPositioned() && style()->hasStaticBlockPosition(isHorizontalWritingMode()) && oldStyle->marginBefore() != style()->marginBefore()
&& parent() && !parent()->normalChildNeedsLayout())
parent()->setChildNeedsLayout(true);
}
// If our zoom factor changes and we have a defined scrollLeft/Top, we need to adjust that value into the
// new zoomed coordinate space.
if (hasOverflowClip() && oldStyle && style() && oldStyle->effectiveZoom() != style()->effectiveZoom()) {
if (int left = layer()->scrollXOffset()) {
left = (left / oldStyle->effectiveZoom()) * style()->effectiveZoom();
layer()->scrollToXOffset(left);
}
if (int top = layer()->scrollYOffset()) {
top = (top / oldStyle->effectiveZoom()) * style()->effectiveZoom();
layer()->scrollToYOffset(top);
}
}
bool isBodyRenderer = isBody();
bool isRootRenderer = isRoot();
// Set the text color if we're the body.
if (isBodyRenderer)
document()->setTextColor(style()->visitedDependentColor(CSSPropertyColor));
if (isRootRenderer || isBodyRenderer) {
// Propagate the new writing mode and direction up to the RenderView.
RenderView* viewRenderer = view();
RenderStyle* viewStyle = viewRenderer->style();
if (viewStyle->direction() != style()->direction() && (isRootRenderer || !document()->directionSetOnDocumentElement())) {
viewStyle->setDirection(style()->direction());
if (isBodyRenderer)
document()->documentElement()->renderer()->style()->setDirection(style()->direction());
setNeedsLayoutAndPrefWidthsRecalc();
}
if (viewStyle->writingMode() != style()->writingMode() && (isRootRenderer || !document()->writingModeSetOnDocumentElement())) {
viewStyle->setWritingMode(style()->writingMode());
viewRenderer->setHorizontalWritingMode(style()->isHorizontalWritingMode());
if (isBodyRenderer) {
document()->documentElement()->renderer()->style()->setWritingMode(style()->writingMode());
document()->documentElement()->renderer()->setHorizontalWritingMode(style()->isHorizontalWritingMode());
}
setNeedsLayoutAndPrefWidthsRecalc();
}
}
}
void RenderBox::updateBoxModelInfoFromStyle()
{
RenderBoxModelObject::updateBoxModelInfoFromStyle();
bool isRootObject = isRoot();
bool isViewObject = isRenderView();
// The root and the RenderView always paint their backgrounds/borders.
if (isRootObject || isViewObject)
setHasBoxDecorations(true);
setPositioned(style()->position() == AbsolutePosition || style()->position() == FixedPosition);
setFloating(!isPositioned() && style()->isFloating());
// We also handle <body> and <html>, whose overflow applies to the viewport.
if (style()->overflowX() != OVISIBLE && !isRootObject && (isRenderBlock() || isTableRow() || isTableSection())) {
bool boxHasOverflowClip = true;
if (isBody()) {
// Overflow on the body can propagate to the viewport under the following conditions.
// (1) The root element is <html>.
// (2) We are the primary <body> (can be checked by looking at document.body).
// (3) The root element has visible overflow.
if (document()->documentElement()->hasTagName(htmlTag) &&
document()->body() == node() &&
document()->documentElement()->renderer()->style()->overflowX() == OVISIBLE)
boxHasOverflowClip = false;
}
// Check for overflow clip.
// It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
if (boxHasOverflowClip) {
if (!s_hadOverflowClip)
// Erase the overflow
repaint();
setHasOverflowClip();
}
}
setHasTransform(style()->hasTransformRelatedProperty());
setHasReflection(style()->boxReflect());
}
void RenderBox::layout()
{
ASSERT(needsLayout());
RenderObject* child = firstChild();
if (!child) {
setNeedsLayout(false);
return;
}
LayoutStateMaintainer statePusher(view(), this, IntSize(x(), y()), style()->isFlippedBlocksWritingMode());
while (child) {
child->layoutIfNeeded();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
statePusher.pop();
setNeedsLayout(false);
}
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar.
int RenderBox::clientWidth() const
{
return width() - borderLeft() - borderRight() - verticalScrollbarWidth();
}
int RenderBox::clientHeight() const
{
return height() - borderTop() - borderBottom() - horizontalScrollbarHeight();
}
int RenderBox::scrollWidth() const
{
if (hasOverflowClip())
return layer()->scrollWidth();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
if (style()->isLeftToRightDirection())
return max(clientWidth(), maxXLayoutOverflow() - borderLeft());
return clientWidth() - min(0, minXLayoutOverflow() - borderLeft());
}
int RenderBox::scrollHeight() const
{
if (hasOverflowClip())
return layer()->scrollHeight();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
return max(clientHeight(), maxYLayoutOverflow() - borderTop());
}
int RenderBox::scrollLeft() const
{
return hasOverflowClip() ? layer()->scrollXOffset() : 0;
}
int RenderBox::scrollTop() const
{
return hasOverflowClip() ? layer()->scrollYOffset() : 0;
}
void RenderBox::setScrollLeft(int newLeft)
{
if (hasOverflowClip())
layer()->scrollToXOffset(newLeft);
}
void RenderBox::setScrollTop(int newTop)
{
if (hasOverflowClip())
layer()->scrollToYOffset(newTop);
}
void RenderBox::absoluteRects(Vector<IntRect>& rects, int tx, int ty)
{
rects.append(IntRect(tx, ty, width(), height()));
}
void RenderBox::absoluteQuads(Vector<FloatQuad>& quads)
{
quads.append(localToAbsoluteQuad(FloatRect(0, 0, width(), height())));
}
void RenderBox::updateLayerTransform()
{
// Transform-origin depends on box size, so we need to update the layer transform after layout.
if (hasLayer())
layer()->updateTransform();
}
IntRect RenderBox::absoluteContentBox() const
{
IntRect rect = contentBoxRect();
FloatPoint absPos = localToAbsolute(FloatPoint());
rect.move(absPos.x(), absPos.y());
return rect;
}
FloatQuad RenderBox::absoluteContentQuad() const
{
IntRect rect = contentBoxRect();
return localToAbsoluteQuad(FloatRect(rect));
}
IntRect RenderBox::outlineBoundsForRepaint(RenderBoxModelObject* repaintContainer, IntPoint* cachedOffsetToRepaintContainer) const
{
IntRect box = borderBoundingBox();
adjustRectForOutlineAndShadow(box);
FloatQuad containerRelativeQuad = FloatRect(box);
if (cachedOffsetToRepaintContainer)
containerRelativeQuad.move(cachedOffsetToRepaintContainer->x(), cachedOffsetToRepaintContainer->y());
else
containerRelativeQuad = localToContainerQuad(containerRelativeQuad, repaintContainer);
box = containerRelativeQuad.enclosingBoundingBox();
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
box.move(view()->layoutDelta());
return box;
}
void RenderBox::addFocusRingRects(Vector<IntRect>& rects, int tx, int ty)
{
if (width() && height())
rects.append(IntRect(tx, ty, width(), height()));
}
IntRect RenderBox::reflectionBox() const
{
IntRect result;
if (!style()->boxReflect())
return result;
IntRect box = borderBoxRect();
result = box;
switch (style()->boxReflect()->direction()) {
case ReflectionBelow:
result.move(0, box.height() + reflectionOffset());
break;
case ReflectionAbove:
result.move(0, -box.height() - reflectionOffset());
break;
case ReflectionLeft:
result.move(-box.width() - reflectionOffset(), 0);
break;
case ReflectionRight:
result.move(box.width() + reflectionOffset(), 0);
break;
}
return result;
}
int RenderBox::reflectionOffset() const
{
if (!style()->boxReflect())
return 0;
if (style()->boxReflect()->direction() == ReflectionLeft || style()->boxReflect()->direction() == ReflectionRight)
return style()->boxReflect()->offset().calcValue(borderBoxRect().width());
return style()->boxReflect()->offset().calcValue(borderBoxRect().height());
}
IntRect RenderBox::reflectedRect(const IntRect& r) const
{
if (!style()->boxReflect())
return IntRect();
IntRect box = borderBoxRect();
IntRect result = r;
switch (style()->boxReflect()->direction()) {
case ReflectionBelow:
result.setY(box.maxY() + reflectionOffset() + (box.maxY() - r.maxY()));
break;
case ReflectionAbove:
result.setY(box.y() - reflectionOffset() - box.height() + (box.maxY() - r.maxY()));
break;
case ReflectionLeft:
result.setX(box.x() - reflectionOffset() - box.width() + (box.maxX() - r.maxX()));
break;
case ReflectionRight:
result.setX(box.maxX() + reflectionOffset() + (box.maxX() - r.maxX()));
break;
}
return result;
}
bool RenderBox::includeVerticalScrollbarSize() const
{
return hasOverflowClip() && !layer()->hasOverlayScrollbars()
&& (style()->overflowY() == OSCROLL || style()->overflowY() == OAUTO);
}
bool RenderBox::includeHorizontalScrollbarSize() const
{
return hasOverflowClip() && !layer()->hasOverlayScrollbars()
&& (style()->overflowX() == OSCROLL || style()->overflowX() == OAUTO);
}
int RenderBox::verticalScrollbarWidth() const
{
return includeVerticalScrollbarSize() ? layer()->verticalScrollbarWidth() : 0;
}
int RenderBox::horizontalScrollbarHeight() const
{
return includeHorizontalScrollbarSize() ? layer()->horizontalScrollbarHeight() : 0;
}
bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
{
RenderLayer* l = layer();
if (l && l->scroll(direction, granularity, multiplier)) {
if (stopNode)
*stopNode = node();
return true;
}
if (stopNode && *stopNode && *stopNode == node())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->scroll(direction, granularity, multiplier, stopNode);
return false;
}
bool RenderBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
{
bool scrolled = false;
RenderLayer* l = layer();
if (l) {
#if PLATFORM(MAC)
// On Mac only we reset the inline direction position when doing a document scroll (e.g., hitting Home/End).
if (granularity == ScrollByDocument)
scrolled = l->scroll(logicalToPhysical(ScrollInlineDirectionBackward, isHorizontalWritingMode(), style()->isFlippedBlocksWritingMode()), ScrollByDocument, multiplier);
#endif
if (l->scroll(logicalToPhysical(direction, isHorizontalWritingMode(), style()->isFlippedBlocksWritingMode()), granularity, multiplier))
scrolled = true;
if (scrolled) {
if (stopNode)
*stopNode = node();
return true;
}
}
if (stopNode && *stopNode && *stopNode == node())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->logicalScroll(direction, granularity, multiplier, stopNode);
return false;
}
bool RenderBox::canBeScrolledAndHasScrollableArea() const
{
return canBeProgramaticallyScrolled(false) && (scrollHeight() != clientHeight() || scrollWidth() != clientWidth());
}
bool RenderBox::canBeProgramaticallyScrolled(bool) const
{
return (hasOverflowClip() && (scrollsOverflow() || (node() && node()->rendererIsEditable()))) || (node() && node()->isDocumentNode());
}
void RenderBox::autoscroll()
{
if (layer())
layer()->autoscroll();
}
void RenderBox::panScroll(const IntPoint& source)
{
if (layer())
layer()->panScrollFromPoint(source);
}
int RenderBox::minPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty())
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
return m_minPreferredLogicalWidth;
}
int RenderBox::maxPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty())
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
return m_maxPreferredLogicalWidth;
}
int RenderBox::overrideSize() const
{
if (!hasOverrideSize())
return -1;
return gOverrideSizeMap->get(this);
}
void RenderBox::setOverrideSize(int s)
{
if (s == -1) {
if (hasOverrideSize()) {
setHasOverrideSize(false);
gOverrideSizeMap->remove(this);
}
} else {
if (!gOverrideSizeMap)
gOverrideSizeMap = new OverrideSizeMap();
setHasOverrideSize(true);
gOverrideSizeMap->set(this, s);
}
}
int RenderBox::overrideWidth() const
{
return hasOverrideSize() ? overrideSize() : width();
}
int RenderBox::overrideHeight() const
{
return hasOverrideSize() ? overrideSize() : height();
}
int RenderBox::computeBorderBoxLogicalWidth(int width) const
{
int bordersPlusPadding = borderAndPaddingLogicalWidth();
if (style()->boxSizing() == CONTENT_BOX)
return width + bordersPlusPadding;
return max(width, bordersPlusPadding);
}
int RenderBox::computeBorderBoxLogicalHeight(int height) const
{
int bordersPlusPadding = borderAndPaddingLogicalHeight();
if (style()->boxSizing() == CONTENT_BOX)
return height + bordersPlusPadding;
return max(height, bordersPlusPadding);
}
int RenderBox::computeContentBoxLogicalWidth(int width) const
{
if (style()->boxSizing() == BORDER_BOX)
width -= borderAndPaddingLogicalWidth();
return max(0, width);
}
int RenderBox::computeContentBoxLogicalHeight(int height) const
{
if (style()->boxSizing() == BORDER_BOX)
height -= borderAndPaddingLogicalHeight();
return max(0, height);
}
// Hit Testing
bool RenderBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, int xPos, int yPos, int tx, int ty, HitTestAction action)
{
tx += x();
ty += y();
// Check kids first.
for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
if (!child->hasLayer() && child->nodeAtPoint(request, result, xPos, yPos, tx, ty, action)) {
updateHitTestResult(result, IntPoint(xPos - tx, yPos - ty));
return true;
}
}
// Check our bounds next. For this purpose always assume that we can only be hit in the
// foreground phase (which is true for replaced elements like images).
IntRect boundsRect = IntRect(tx, ty, width(), height());
if (visibleToHitTesting() && action == HitTestForeground && boundsRect.intersects(result.rectForPoint(xPos, yPos))) {
updateHitTestResult(result, IntPoint(xPos - tx, yPos - ty));
if (!result.addNodeToRectBasedTestResult(node(), xPos, yPos, boundsRect))
return true;
}
return false;
}
// --------------------- painting stuff -------------------------------
void RenderBox::paint(PaintInfo& paintInfo, int tx, int ty)
{
tx += x();
ty += y();
// default implementation. Just pass paint through to the children
PaintInfo childInfo(paintInfo);
childInfo.updatePaintingRootForChildren(this);
for (RenderObject* child = firstChild(); child; child = child->nextSibling())
child->paint(childInfo, tx, ty);
}
void RenderBox::paintRootBoxFillLayers(const PaintInfo& paintInfo)
{
const FillLayer* bgLayer = style()->backgroundLayers();
Color bgColor = style()->visitedDependentColor(CSSPropertyBackgroundColor);
RenderObject* bodyObject = 0;
if (!hasBackground() && node() && node()->hasTagName(HTMLNames::htmlTag)) {
// Locate the <body> element using the DOM. This is easier than trying
// to crawl around a render tree with potential :before/:after content and
// anonymous blocks created by inline <body> tags etc. We can locate the <body>
// render object very easily via the DOM.
HTMLElement* body = document()->body();
bodyObject = (body && body->hasLocalName(bodyTag)) ? body->renderer() : 0;
if (bodyObject) {
bgLayer = bodyObject->style()->backgroundLayers();
bgColor = bodyObject->style()->visitedDependentColor(CSSPropertyBackgroundColor);
}
}
// The background of the box generated by the root element covers the entire canvas, so just use
// the RenderView's docTop/Left/Width/Height accessors.
paintFillLayers(paintInfo, bgColor, bgLayer, view()->docLeft(), view()->docTop(), view()->docWidth(), view()->docHeight(), BackgroundBleedNone, CompositeSourceOver, bodyObject);
}
void RenderBox::paintBoxDecorations(PaintInfo& paintInfo, int tx, int ty)
{
if (!paintInfo.shouldPaintWithinRoot(this))
return;
return paintBoxDecorationsWithSize(paintInfo, tx, ty, width(), height());
}
BackgroundBleedAvoidance RenderBox::determineBackgroundBleedAvoidance(GraphicsContext* context) const
{
if (context->paintingDisabled())
return BackgroundBleedNone;
const RenderStyle* style = this->style();
if (!style->hasBackground() || !style->hasBorder() || !style->hasBorderRadius() || borderImageIsLoadedAndCanBeRendered())
return BackgroundBleedNone;
AffineTransform ctm = context->getCTM();
FloatSize contextScaling(static_cast<float>(ctm.xScale()), static_cast<float>(ctm.yScale()));
if (borderObscuresBackgroundEdge(contextScaling))
return BackgroundBleedShrinkBackground;
// FIXME: there is one more strategy possible, for opaque backgrounds and
// translucent borders. In that case we could avoid using a transparency layer,
// and paint the border first, and then paint the background clipped to the
// inside of the border.
return BackgroundBleedUseTransparencyLayer;
}
void RenderBox::paintBoxDecorationsWithSize(PaintInfo& paintInfo, int tx, int ty, int width, int height)
{
// border-fit can adjust where we paint our border and background. If set, we snugly fit our line box descendants. (The iChat
// balloon layout is an example of this).
borderFitAdjust(tx, width);
// FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
// custom shadows of their own.
paintBoxShadow(paintInfo.context, tx, ty, width, height, style(), Normal);
BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context);
GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer) {
// To avoid the background color bleeding out behind the border, we'll render background and border
// into a transparency layer, and then clip that in one go (which requires setting up the clip before
// beginning the layer).
RoundedIntRect border = style()->getRoundedBorderFor(IntRect(tx, ty, width, height));
stateSaver.save();
paintInfo.context->addRoundedRectClip(border);
paintInfo.context->beginTransparencyLayer(1);
}
// If we have a native theme appearance, paint that before painting our background.
// The theme will tell us whether or not we should also paint the CSS background.
bool themePainted = style()->hasAppearance() && !theme()->paint(this, paintInfo, IntRect(tx, ty, width, height));
if (!themePainted) {
if (isRoot())
paintRootBoxFillLayers(paintInfo);
else if (!isBody() || document()->documentElement()->renderer()->hasBackground()) {
// The <body> only paints its background if the root element has defined a background
// independent of the body.
paintFillLayers(paintInfo, style()->visitedDependentColor(CSSPropertyBackgroundColor), style()->backgroundLayers(), tx, ty, width, height, bleedAvoidance);
}
if (style()->hasAppearance())
theme()->paintDecorations(this, paintInfo, IntRect(tx, ty, width, height));
}
paintBoxShadow(paintInfo.context, tx, ty, width, height, style(), Inset);
// The theme will tell us whether or not we should also paint the CSS border.
if ((!style()->hasAppearance() || (!themePainted && theme()->paintBorderOnly(this, paintInfo, IntRect(tx, ty, width, height)))) && style()->hasBorder())
paintBorder(paintInfo.context, IntRect(tx, ty, width, height), style(), bleedAvoidance);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer)
paintInfo.context->endTransparencyLayer();
}
void RenderBox::paintMask(PaintInfo& paintInfo, int tx, int ty)
{
if (!paintInfo.shouldPaintWithinRoot(this) || style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask || paintInfo.context->paintingDisabled())
return;
int w = width();
int h = height();
// border-fit can adjust where we paint our border and background. If set, we snugly fit our line box descendants. (The iChat
// balloon layout is an example of this).
borderFitAdjust(tx, w);
paintMaskImages(paintInfo, tx, ty, w, h);
}
void RenderBox::paintMaskImages(const PaintInfo& paintInfo, int tx, int ty, int w, int h)
{
// Figure out if we need to push a transparency layer to render our mask.
bool pushTransparencyLayer = false;
bool compositedMask = hasLayer() && layer()->hasCompositedMask();
CompositeOperator compositeOp = CompositeSourceOver;
bool allMaskImagesLoaded = true;
if (!compositedMask) {
// If the context has a rotation, scale or skew, then use a transparency layer to avoid
// pixel cruft around the edge of the mask.
const AffineTransform& currentCTM = paintInfo.context->getCTM();
pushTransparencyLayer = !currentCTM.isIdentityOrTranslationOrFlipped();
StyleImage* maskBoxImage = style()->maskBoxImage().image();
const FillLayer* maskLayers = style()->maskLayers();
// Don't render a masked element until all the mask images have loaded, to prevent a flash of unmasked content.
if (maskBoxImage)
allMaskImagesLoaded &= maskBoxImage->isLoaded();
if (maskLayers)
allMaskImagesLoaded &= maskLayers->imagesAreLoaded();
// Before all images have loaded, just use an empty transparency layer as the mask.
if (!allMaskImagesLoaded)
pushTransparencyLayer = true;
if (maskBoxImage && maskLayers->hasImage()) {
// We have a mask-box-image and mask-image, so need to composite them together before using the result as a mask.
pushTransparencyLayer = true;
} else {
// We have to use an extra image buffer to hold the mask. Multiple mask images need
// to composite together using source-over so that they can then combine into a single unified mask that
// can be composited with the content using destination-in. SVG images need to be able to set compositing modes
// as they draw images contained inside their sub-document, so we paint all our images into a separate buffer
// and composite that buffer as the mask.
// We have to check that the mask images to be rendered contain at least one image that can be actually used in rendering
// before pushing the transparency layer.
for (const FillLayer* fillLayer = maskLayers->next(); fillLayer; fillLayer = fillLayer->next()) {
if (fillLayer->hasImage() && fillLayer->image()->canRender(style()->effectiveZoom())) {
pushTransparencyLayer = true;
// We found one image that can be used in rendering, exit the loop
break;
}
}
}
compositeOp = CompositeDestinationIn;
if (pushTransparencyLayer) {
paintInfo.context->setCompositeOperation(CompositeDestinationIn);
paintInfo.context->beginTransparencyLayer(1.0f);
compositeOp = CompositeSourceOver;
}
}
if (allMaskImagesLoaded) {
paintFillLayers(paintInfo, Color(), style()->maskLayers(), tx, ty, w, h, BackgroundBleedNone, compositeOp);
paintNinePieceImage(paintInfo.context, IntRect(tx, ty, w, h), style(), style()->maskBoxImage(), compositeOp);
}
if (pushTransparencyLayer)
paintInfo.context->endTransparencyLayer();
}
IntRect RenderBox::maskClipRect()
{
IntRect bbox = borderBoxRect();
if (style()->maskBoxImage().image())
return bbox;
IntRect result;
for (const FillLayer* maskLayer = style()->maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
if (maskLayer->image()) {
IntRect maskRect;
IntPoint phase;
IntSize tileSize;
calculateBackgroundImageGeometry(maskLayer, bbox.x(), bbox.y(), bbox.width(), bbox.height(), maskRect, phase, tileSize);
result.unite(maskRect);
}
}
return result;
}
void RenderBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, int tx, int ty, int width, int height,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
{
if (!fillLayer)
return;
paintFillLayers(paintInfo, c, fillLayer->next(), tx, ty, width, height, bleedAvoidance, op, backgroundObject);
paintFillLayer(paintInfo, c, fillLayer, tx, ty, width, height, bleedAvoidance, op, backgroundObject);
}
void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, int tx, int ty, int width, int height,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
{
paintFillLayerExtended(paintInfo, c, fillLayer, tx, ty, width, height, bleedAvoidance, 0, 0, 0, op, backgroundObject);
}
#if USE(ACCELERATED_COMPOSITING)
static bool layersUseImage(WrappedImagePtr image, const FillLayer* layers)
{