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android / platform / external / chromium_org / third_party / WebKit / eed44c9 / . / Source / core / paint / BoxPainter.cpp
blob: 2a9a2b6bfb27d10f04fcfec381748385601f1d87 [file] [log] [blame]
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/paint/BoxPainter.h"
#include "core/HTMLNames.h"
#include "core/frame/Settings.h"
#include "core/html/HTMLFrameOwnerElement.h"
#include "core/paint/BackgroundImageGeometry.h"
#include "core/paint/BoxDecorationData.h"
#include "core/paint/DrawingRecorder.h"
#include "core/rendering/ImageQualityController.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderBox.h"
#include "core/rendering/RenderBoxModelObject.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderObject.h"
#include "core/rendering/RenderTable.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/RenderView.h"
#include "core/rendering/compositing/CompositedLayerMapping.h"
#include "core/rendering/style/BorderEdge.h"
#include "core/rendering/style/ShadowList.h"
#include "platform/LengthFunctions.h"
#include "platform/geometry/LayoutPoint.h"
#include "platform/graphics/GraphicsContextStateSaver.h"
namespace blink {
void BoxPainter::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
LayoutPoint adjustedPaintOffset = paintOffset + m_renderBox.location();
// default implementation. Just pass paint through to the children
PaintInfo childInfo(paintInfo);
childInfo.updatePaintingRootForChildren(&m_renderBox);
for (RenderObject* child = m_renderBox.slowFirstChild(); child; child = child->nextSibling())
child->paint(childInfo, adjustedPaintOffset);
}
void BoxPainter::paintBoxDecorationBackground(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(&m_renderBox))
return;
LayoutRect paintRect = m_renderBox.borderBoxRect();
paintRect.moveBy(paintOffset);
paintBoxDecorationBackgroundWithRect(paintInfo, paintOffset, paintRect);
}
void BoxPainter::paintBoxDecorationBackgroundWithRect(PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
{
RenderStyle* style = m_renderBox.style();
BoxDecorationData boxDecorationData(*style, m_renderBox.canRenderBorderImage(), m_renderBox.backgroundHasOpaqueTopLayer(), paintInfo.context);
IntRect snappedPaintRect(pixelSnappedIntRect(paintRect));
// The document element is specified to paint its background infinitely.
DrawingRecorder recorder(paintInfo.context, &m_renderBox, paintInfo.phase,
m_renderBox.isDocumentElement() ? m_renderBox.view()->backgroundRect(&m_renderBox) : snappedPaintRect);
// FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
// custom shadows of their own.
if (!m_renderBox.boxShadowShouldBeAppliedToBackground(boxDecorationData.bleedAvoidance()))
paintBoxShadow(paintInfo, paintRect, style, Normal);
GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
if (boxDecorationData.bleedAvoidance() == BackgroundBleedClipBackground) {
stateSaver.save();
RoundedRect border = style->getRoundedBorderFor(paintRect);
paintInfo.context->clipRoundedRect(border);
}
// 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 = boxDecorationData.hasAppearance && !RenderTheme::theme().paint(&m_renderBox, paintInfo, snappedPaintRect);
if (!themePainted) {
if (boxDecorationData.bleedAvoidance() == BackgroundBleedBackgroundOverBorder)
paintBorder(m_renderBox, paintInfo, paintRect, style, boxDecorationData.bleedAvoidance());
paintBackground(paintInfo, paintRect, boxDecorationData.backgroundColor, boxDecorationData.bleedAvoidance());
if (boxDecorationData.hasAppearance)
RenderTheme::theme().paintDecorations(&m_renderBox, paintInfo, snappedPaintRect);
}
paintBoxShadow(paintInfo, paintRect, style, Inset);
// The theme will tell us whether or not we should also paint the CSS border.
if (boxDecorationData.hasBorder && boxDecorationData.bleedAvoidance() != BackgroundBleedBackgroundOverBorder
&& (!boxDecorationData.hasAppearance || (!themePainted && RenderTheme::theme().paintBorderOnly(&m_renderBox, paintInfo, snappedPaintRect)))
&& !(m_renderBox.isTable() && toRenderTable(&m_renderBox)->collapseBorders()))
paintBorder(m_renderBox, paintInfo, paintRect, style, boxDecorationData.bleedAvoidance());
}
static bool skipBodyBackground(const RenderBox* bodyElementRenderer)
{
ASSERT(bodyElementRenderer->isBody());
// The <body> only paints its background if the root element has defined a background independent of the body,
// or if the <body>'s parent is not the document element's renderer (e.g. inside SVG foreignObject).
RenderObject* documentElementRenderer = bodyElementRenderer->document().documentElement()->renderer();
return documentElementRenderer
&& !documentElementRenderer->hasBackground()
&& (documentElementRenderer == bodyElementRenderer->parent());
}
void BoxPainter::paintBackground(const PaintInfo& paintInfo, const LayoutRect& paintRect, const Color& backgroundColor, BackgroundBleedAvoidance bleedAvoidance)
{
if (m_renderBox.isDocumentElement()) {
paintRootBoxFillLayers(paintInfo);
return;
}
if (m_renderBox.isBody() && skipBodyBackground(&m_renderBox))
return;
if (m_renderBox.boxDecorationBackgroundIsKnownToBeObscured())
return;
paintFillLayers(paintInfo, backgroundColor, m_renderBox.style()->backgroundLayers(), paintRect, bleedAvoidance);
}
void BoxPainter::paintRootBoxFillLayers(const PaintInfo& paintInfo)
{
if (paintInfo.skipRootBackground())
return;
RenderObject* rootBackgroundRenderer = m_renderBox.rendererForRootBackground();
const FillLayer& bgLayer = rootBackgroundRenderer->style()->backgroundLayers();
Color bgColor = rootBackgroundRenderer->resolveColor(CSSPropertyBackgroundColor);
paintFillLayers(paintInfo, bgColor, bgLayer, m_renderBox.view()->backgroundRect(&m_renderBox), BackgroundBleedNone, CompositeSourceOver, rootBackgroundRenderer);
}
void BoxPainter::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer& fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
{
Vector<const FillLayer*, 8> layers;
const FillLayer* curLayer = &fillLayer;
bool shouldDrawBackgroundInSeparateBuffer = false;
bool isBottomLayerOccluded = false;
while (curLayer) {
layers.append(curLayer);
// Stop traversal when an opaque layer is encountered.
// FIXME : It would be possible for the following occlusion culling test to be more aggressive
// on layers with no repeat by testing whether the image covers the layout rect.
// Testing that here would imply duplicating a lot of calculations that are currently done in
// RenderBoxModelObject::paintFillLayerExtended. A more efficient solution might be to move
// the layer recursion into paintFillLayerExtended, or to compute the layer geometry here
// and pass it down.
if (!shouldDrawBackgroundInSeparateBuffer && curLayer->blendMode() != WebBlendModeNormal)
shouldDrawBackgroundInSeparateBuffer = true;
// The clipOccludesNextLayers condition must be evaluated first to avoid short-circuiting.
if (curLayer->clipOccludesNextLayers(curLayer == &fillLayer)
&& curLayer->hasOpaqueImage(&m_renderBox)
&& curLayer->image()->canRender(m_renderBox, m_renderBox.style()->effectiveZoom())
&& curLayer->hasRepeatXY()
&& curLayer->blendMode() == WebBlendModeNormal
&& !m_renderBox.boxShadowShouldBeAppliedToBackground(bleedAvoidance))
break;
curLayer = curLayer->next();
}
if (layers.size() > 0 && (**layers.rbegin()).next())
isBottomLayerOccluded = true;
GraphicsContext* context = paintInfo.context;
if (!context)
shouldDrawBackgroundInSeparateBuffer = false;
bool skipBaseColor = false;
if (shouldDrawBackgroundInSeparateBuffer) {
bool isBaseColorVisible = !isBottomLayerOccluded && c.hasAlpha();
// Paint the document's base background color outside the transparency layer,
// so that the background images don't blend with this color: http://crbug.com/389039.
if (isBaseColorVisible && isDocumentElementWithOpaqueBackground(m_renderBox)) {
paintRootBackgroundColor(m_renderBox, paintInfo, rect, Color());
skipBaseColor = true;
}
context->beginTransparencyLayer(1);
}
Vector<const FillLayer*>::const_reverse_iterator topLayer = layers.rend();
for (Vector<const FillLayer*>::const_reverse_iterator it = layers.rbegin(); it != topLayer; ++it)
paintFillLayer(paintInfo, c, **it, rect, bleedAvoidance, op, backgroundObject, skipBaseColor);
if (shouldDrawBackgroundInSeparateBuffer)
context->endLayer();
}
void BoxPainter::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer& fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject, bool skipBaseColor)
{
BoxPainter::paintFillLayerExtended(m_renderBox, paintInfo, c, fillLayer, rect, bleedAvoidance, 0, LayoutSize(), op, backgroundObject, skipBaseColor);
}
void BoxPainter::applyBoxShadowForBackground(GraphicsContext* context, RenderObject& obj)
{
const ShadowList* shadowList = obj.style()->boxShadow();
ASSERT(shadowList);
for (size_t i = shadowList->shadows().size(); i--; ) {
const ShadowData& boxShadow = shadowList->shadows()[i];
if (boxShadow.style() != Normal)
continue;
FloatSize shadowOffset(boxShadow.x(), boxShadow.y());
context->setShadow(shadowOffset, boxShadow.blur(), boxShadow.color(),
DrawLooperBuilder::ShadowRespectsTransforms, DrawLooperBuilder::ShadowIgnoresAlpha);
return;
}
}
// FIXME: See crbug.com/382491. The use of getCTM in this context is incorrect because the matrix returned does not
// include scales applied at raster time, such as the device zoom.
static LayoutRect shrinkRectByOnePixel(GraphicsContext* context, const LayoutRect& rect)
{
LayoutRect shrunkRect = rect;
AffineTransform transform = context->getCTM();
shrunkRect.inflateX(-static_cast<LayoutUnit>(ceil(1 / transform.xScale())));
shrunkRect.inflateY(-static_cast<LayoutUnit>(ceil(1 / transform.yScale())));
return shrunkRect;
}
RoundedRect BoxPainter::getBackgroundRoundedRect(RenderObject& obj, const LayoutRect& borderRect, InlineFlowBox* box, LayoutUnit inlineBoxWidth, LayoutUnit inlineBoxHeight,
bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
RoundedRect border = obj.style()->getRoundedBorderFor(borderRect, includeLogicalLeftEdge, includeLogicalRightEdge);
if (box && (box->nextLineBox() || box->prevLineBox())) {
RoundedRect segmentBorder = obj.style()->getRoundedBorderFor(LayoutRect(0, 0, inlineBoxWidth, inlineBoxHeight), includeLogicalLeftEdge, includeLogicalRightEdge);
border.setRadii(segmentBorder.radii());
}
return border;
}
RoundedRect BoxPainter::backgroundRoundedRectAdjustedForBleedAvoidance(RenderObject& obj, GraphicsContext* context, const LayoutRect& borderRect, BackgroundBleedAvoidance bleedAvoidance, InlineFlowBox* box, const LayoutSize& boxSize, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
if (bleedAvoidance == BackgroundBleedShrinkBackground) {
// We shrink the rectangle by one pixel on each side because the bleed is one pixel maximum.
return BoxPainter::getBackgroundRoundedRect(obj, shrinkRectByOnePixel(context, borderRect), box, boxSize.width(), boxSize.height(), includeLogicalLeftEdge, includeLogicalRightEdge);
}
if (bleedAvoidance == BackgroundBleedBackgroundOverBorder)
return obj.style()->getRoundedInnerBorderFor(borderRect, includeLogicalLeftEdge, includeLogicalRightEdge);
return BoxPainter::getBackgroundRoundedRect(obj, borderRect, box, boxSize.width(), boxSize.height(), includeLogicalLeftEdge, includeLogicalRightEdge);
}
void BoxPainter::clipRoundedInnerRect(GraphicsContext * context, const LayoutRect& rect, const RoundedRect& clipRect)
{
if (clipRect.isRenderable()) {
context->clipRoundedRect(clipRect);
} else {
// We create a rounded rect for each of the corners and clip it, while making sure we clip opposing corners together.
if (!clipRect.radii().topLeft().isEmpty() || !clipRect.radii().bottomRight().isEmpty()) {
IntRect topCorner(clipRect.rect().x(), clipRect.rect().y(), rect.maxX() - clipRect.rect().x(), rect.maxY() - clipRect.rect().y());
RoundedRect::Radii topCornerRadii;
topCornerRadii.setTopLeft(clipRect.radii().topLeft());
context->clipRoundedRect(RoundedRect(topCorner, topCornerRadii));
IntRect bottomCorner(rect.x(), rect.y(), clipRect.rect().maxX() - rect.x(), clipRect.rect().maxY() - rect.y());
RoundedRect::Radii bottomCornerRadii;
bottomCornerRadii.setBottomRight(clipRect.radii().bottomRight());
context->clipRoundedRect(RoundedRect(bottomCorner, bottomCornerRadii));
}
if (!clipRect.radii().topRight().isEmpty() || !clipRect.radii().bottomLeft().isEmpty()) {
IntRect topCorner(rect.x(), clipRect.rect().y(), clipRect.rect().maxX() - rect.x(), rect.maxY() - clipRect.rect().y());
RoundedRect::Radii topCornerRadii;
topCornerRadii.setTopRight(clipRect.radii().topRight());
context->clipRoundedRect(RoundedRect(topCorner, topCornerRadii));
IntRect bottomCorner(clipRect.rect().x(), rect.y(), rect.maxX() - clipRect.rect().x(), clipRect.rect().maxY() - rect.y());
RoundedRect::Radii bottomCornerRadii;
bottomCornerRadii.setBottomLeft(clipRect.radii().bottomLeft());
context->clipRoundedRect(RoundedRect(bottomCorner, bottomCornerRadii));
}
}
}
void BoxPainter::paintFillLayerExtended(RenderBoxModelObject& obj, const PaintInfo& paintInfo, const Color& color, const FillLayer& bgLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, InlineFlowBox* box, const LayoutSize& boxSize, CompositeOperator op, RenderObject* backgroundObject, bool skipBaseColor)
{
GraphicsContext* context = paintInfo.context;
if (rect.isEmpty())
return;
bool includeLeftEdge = box ? box->includeLogicalLeftEdge() : true;
bool includeRightEdge = box ? box->includeLogicalRightEdge() : true;
bool hasRoundedBorder = obj.style()->hasBorderRadius() && (includeLeftEdge || includeRightEdge);
bool clippedWithLocalScrolling = obj.hasOverflowClip() && bgLayer.attachment() == LocalBackgroundAttachment;
bool isBorderFill = bgLayer.clip() == BorderFillBox;
bool isDocumentElementRenderer = obj.isDocumentElement();
bool isBottomLayer = !bgLayer.next();
Color bgColor = color;
StyleImage* bgImage = bgLayer.image();
bool shouldPaintBackgroundImage = bgImage && bgImage->canRender(obj, obj.style()->effectiveZoom());
bool forceBackgroundToWhite = false;
if (obj.document().printing()) {
if (obj.style()->printColorAdjust() == PrintColorAdjustEconomy)
forceBackgroundToWhite = true;
if (obj.document().settings() && obj.document().settings()->shouldPrintBackgrounds())
forceBackgroundToWhite = false;
}
// When printing backgrounds is disabled or using economy mode,
// change existing background colors and images to a solid white background.
// If there's no bg color or image, leave it untouched to avoid affecting transparency.
// We don't try to avoid loading the background images, because this style flag is only set
// when printing, and at that point we've already loaded the background images anyway. (To avoid
// loading the background images we'd have to do this check when applying styles rather than
// while rendering.)
if (forceBackgroundToWhite) {
// Note that we can't reuse this variable below because the bgColor might be changed
bool shouldPaintBackgroundColor = isBottomLayer && bgColor.alpha();
if (shouldPaintBackgroundImage || shouldPaintBackgroundColor) {
bgColor = Color::white;
shouldPaintBackgroundImage = false;
}
}
bool colorVisible = bgColor.alpha();
// Fast path for drawing simple color backgrounds.
if (!isDocumentElementRenderer && !clippedWithLocalScrolling && !shouldPaintBackgroundImage && isBorderFill && isBottomLayer) {
if (!colorVisible)
return;
bool boxShadowShouldBeAppliedToBackground = obj.boxShadowShouldBeAppliedToBackground(bleedAvoidance, box);
GraphicsContextStateSaver shadowStateSaver(*context, boxShadowShouldBeAppliedToBackground);
if (boxShadowShouldBeAppliedToBackground)
BoxPainter::applyBoxShadowForBackground(context, obj);
if (hasRoundedBorder && bleedAvoidance != BackgroundBleedClipBackground) {
RoundedRect border = backgroundRoundedRectAdjustedForBleedAvoidance(obj, context, rect, bleedAvoidance, box, boxSize, includeLeftEdge, includeRightEdge);
if (border.isRenderable()) {
context->fillRoundedRect(border, bgColor);
} else {
context->save();
clipRoundedInnerRect(context, rect, border);
context->fillRect(border.rect(), bgColor);
context->restore();
}
} else {
context->fillRect(pixelSnappedIntRect(rect), bgColor);
}
return;
}
// BorderFillBox radius clipping is taken care of by BackgroundBleedClipBackground
bool clipToBorderRadius = hasRoundedBorder && !(isBorderFill && bleedAvoidance == BackgroundBleedClipBackground);
GraphicsContextStateSaver clipToBorderStateSaver(*context, clipToBorderRadius);
if (clipToBorderRadius) {
RoundedRect border = isBorderFill ? backgroundRoundedRectAdjustedForBleedAvoidance(obj, context, rect, bleedAvoidance, box, boxSize, includeLeftEdge, includeRightEdge) : getBackgroundRoundedRect(obj, rect, box, boxSize.width(), boxSize.height(), includeLeftEdge, includeRightEdge);
// Clip to the padding or content boxes as necessary.
if (bgLayer.clip() == ContentFillBox) {
border = obj.style()->getRoundedInnerBorderFor(border.rect(),
obj.paddingTop() + obj.borderTop(), obj.paddingBottom() + obj.borderBottom(),
obj.paddingLeft() + obj.borderLeft(), obj.paddingRight() + obj.borderRight(), includeLeftEdge, includeRightEdge);
} else if (bgLayer.clip() == PaddingFillBox) {
border = obj.style()->getRoundedInnerBorderFor(border.rect(), includeLeftEdge, includeRightEdge);
}
clipRoundedInnerRect(context, rect, border);
}
int bLeft = includeLeftEdge ? obj.borderLeft() : 0;
int bRight = includeRightEdge ? obj.borderRight() : 0;
LayoutUnit pLeft = includeLeftEdge ? obj.paddingLeft() : LayoutUnit();
LayoutUnit pRight = includeRightEdge ? obj.paddingRight() : LayoutUnit();
GraphicsContextStateSaver clipWithScrollingStateSaver(*context, clippedWithLocalScrolling);
LayoutRect scrolledPaintRect = rect;
if (clippedWithLocalScrolling) {
// Clip to the overflow area.
RenderBox* thisBox = toRenderBox(&obj);
context->clip(thisBox->overflowClipRect(rect.location()));
// Adjust the paint rect to reflect a scrolled content box with borders at the ends.
IntSize offset = thisBox->scrolledContentOffset();
scrolledPaintRect.move(-offset);
scrolledPaintRect.setWidth(bLeft + thisBox->scrollWidth() + bRight);
scrolledPaintRect.setHeight(thisBox->borderTop() + thisBox->scrollHeight() + thisBox->borderBottom());
}
GraphicsContextStateSaver backgroundClipStateSaver(*context, false);
IntRect maskRect;
switch (bgLayer.clip()) {
case PaddingFillBox:
case ContentFillBox: {
if (clipToBorderRadius)
break;
// Clip to the padding or content boxes as necessary.
bool includePadding = bgLayer.clip() == ContentFillBox;
LayoutRect clipRect = LayoutRect(scrolledPaintRect.x() + bLeft + (includePadding ? pLeft : LayoutUnit()),
scrolledPaintRect.y() + obj.borderTop() + (includePadding ? obj.paddingTop() : LayoutUnit()),
scrolledPaintRect.width() - bLeft - bRight - (includePadding ? pLeft + pRight : LayoutUnit()),
scrolledPaintRect.height() - obj.borderTop() - obj.borderBottom() - (includePadding ? obj.paddingTop() + obj.paddingBottom() : LayoutUnit()));
backgroundClipStateSaver.save();
context->clip(clipRect);
break;
}
case TextFillBox: {
// First figure out how big the mask has to be. It should be no bigger than what we need
// to actually render, so we should intersect the dirty rect with the border box of the background.
maskRect = pixelSnappedIntRect(rect);
maskRect.intersect(paintInfo.rect);
// We draw the background into a separate layer, to be later masked with yet another layer
// holding the text content.
backgroundClipStateSaver.save();
context->clip(maskRect);
context->beginTransparencyLayer(1);
break;
}
case BorderFillBox:
break;
default:
ASSERT_NOT_REACHED();
break;
}
// Paint the color first underneath all images, culled if background image occludes it.
// FIXME: In the bgLayer->hasFiniteBounds() case, we could improve the culling test
// by verifying whether the background image covers the entire layout rect.
if (isBottomLayer) {
IntRect backgroundRect(pixelSnappedIntRect(scrolledPaintRect));
bool boxShadowShouldBeAppliedToBackground = obj.boxShadowShouldBeAppliedToBackground(bleedAvoidance, box);
bool isOpaqueRoot = (isDocumentElementRenderer && !bgColor.hasAlpha()) || isDocumentElementWithOpaqueBackground(obj);
if (boxShadowShouldBeAppliedToBackground || !shouldPaintBackgroundImage || !bgLayer.hasOpaqueImage(&obj) || !bgLayer.hasRepeatXY() || (isOpaqueRoot && !toRenderBox(&obj)->height())) {
if (!boxShadowShouldBeAppliedToBackground)
backgroundRect.intersect(paintInfo.rect);
GraphicsContextStateSaver shadowStateSaver(*context, boxShadowShouldBeAppliedToBackground);
if (boxShadowShouldBeAppliedToBackground)
BoxPainter::applyBoxShadowForBackground(context, obj);
if (isOpaqueRoot && !skipBaseColor) {
paintRootBackgroundColor(obj, paintInfo, rect, bgColor);
} else if (bgColor.alpha()) {
context->fillRect(backgroundRect, bgColor, context->compositeOperation());
}
}
}
// no progressive loading of the background image
if (shouldPaintBackgroundImage) {
BackgroundImageGeometry geometry;
calculateBackgroundImageGeometry(obj, paintInfo.paintContainer(), bgLayer, scrolledPaintRect, geometry, backgroundObject);
if (!geometry.destRect().isEmpty()) {
CompositeOperator compositeOp = op == CompositeSourceOver ? bgLayer.composite() : op;
RenderObject* clientForBackgroundImage = backgroundObject ? backgroundObject : &obj;
RefPtr<Image> image = bgImage->image(clientForBackgroundImage, geometry.tileSize());
InterpolationQuality interpolationQuality = chooseInterpolationQuality(obj, context, image.get(), &bgLayer, geometry.tileSize());
if (bgLayer.maskSourceType() == MaskLuminance)
context->setColorFilter(ColorFilterLuminanceToAlpha);
InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
context->setImageInterpolationQuality(interpolationQuality);
context->drawTiledImage(image.get(), geometry.destRect(), geometry.phase(), geometry.tileSize(),
compositeOp, bgLayer.blendMode(), geometry.spaceSize());
context->setImageInterpolationQuality(previousInterpolationQuality);
}
}
if (bgLayer.clip() == TextFillBox) {
// Create the text mask layer.
context->setCompositeOperation(CompositeDestinationIn);
context->beginTransparencyLayer(1);
// FIXME: Workaround for https://code.google.com/p/skia/issues/detail?id=1291.
context->clearRect(maskRect);
// Now draw the text into the mask. We do this by painting using a special paint phase that signals to
// InlineTextBoxes that they should just add their contents to the clip.
PaintInfo info(context, maskRect, PaintPhaseTextClip, PaintBehaviorForceBlackText, 0);
context->setCompositeOperation(CompositeSourceOver);
if (box) {
RootInlineBox& root = box->root();
box->paint(info, LayoutPoint(scrolledPaintRect.x() - box->x(), scrolledPaintRect.y() - box->y()), root.lineTop(), root.lineBottom());
} else {
LayoutSize localOffset = obj.isBox() ? toRenderBox(&obj)->locationOffset() : LayoutSize();
obj.paint(info, scrolledPaintRect.location() - localOffset);
}
context->endLayer();
context->endLayer();
}
}
void BoxPainter::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(&m_renderBox) || m_renderBox.style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask)
return;
LayoutRect paintRect = LayoutRect(paintOffset, m_renderBox.size());
paintMaskImages(paintInfo, paintRect);
}
void BoxPainter::paintMaskImages(const PaintInfo& paintInfo, const LayoutRect& paintRect)
{
// Figure out if we need to push a transparency layer to render our mask.
bool pushTransparencyLayer = false;
bool compositedMask = m_renderBox.hasLayer() && m_renderBox.layer()->hasCompositedMask();
bool flattenCompositingLayers = m_renderBox.view()->frameView() && m_renderBox.view()->frameView()->paintBehavior() & PaintBehaviorFlattenCompositingLayers;
CompositeOperator compositeOp = CompositeSourceOver;
bool allMaskImagesLoaded = true;
if (!compositedMask || flattenCompositingLayers) {
pushTransparencyLayer = true;
StyleImage* maskBoxImage = m_renderBox.style()->maskBoxImage().image();
const FillLayer& maskLayers = m_renderBox.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();
allMaskImagesLoaded &= maskLayers.imagesAreLoaded();
paintInfo.context->setCompositeOperation(CompositeDestinationIn);
paintInfo.context->beginTransparencyLayer(1);
compositeOp = CompositeSourceOver;
}
if (allMaskImagesLoaded) {
paintFillLayers(paintInfo, Color::transparent, m_renderBox.style()->maskLayers(), paintRect, BackgroundBleedNone, compositeOp);
paintNinePieceImage(m_renderBox, paintInfo.context, paintRect, m_renderBox.style(), m_renderBox.style()->maskBoxImage(), compositeOp);
}
if (pushTransparencyLayer)
paintInfo.context->endLayer();
}
void BoxPainter::paintClippingMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(&m_renderBox) || m_renderBox.style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseClippingMask)
return;
if (!m_renderBox.layer() || m_renderBox.layer()->compositingState() != PaintsIntoOwnBacking)
return;
LayoutRect paintRect = LayoutRect(paintOffset, m_renderBox.size());
paintInfo.context->fillRect(pixelSnappedIntRect(paintRect), Color::black);
}
void BoxPainter::paintRootBackgroundColor(RenderObject& obj, const PaintInfo& paintInfo, const LayoutRect& rect, const Color& bgColor)
{
GraphicsContext* context = paintInfo.context;
if (rect.isEmpty())
return;
ASSERT(obj.isDocumentElement());
IntRect backgroundRect(pixelSnappedIntRect(rect));
backgroundRect.intersect(paintInfo.rect);
Color baseColor = obj.view()->frameView()->baseBackgroundColor();
bool shouldClearDocumentBackground = obj.document().settings() && obj.document().settings()->shouldClearDocumentBackground();
CompositeOperator operation = shouldClearDocumentBackground ? CompositeCopy : context->compositeOperation();
// If we have an alpha go ahead and blend with the base background color.
if (baseColor.alpha()) {
if (bgColor.alpha())
baseColor = baseColor.blend(bgColor);
context->fillRect(backgroundRect, baseColor, operation);
} else if (bgColor.alpha()) {
context->fillRect(backgroundRect, bgColor, operation);
} else if (shouldClearDocumentBackground) {
context->clearRect(backgroundRect);
}
}
bool BoxPainter::isDocumentElementWithOpaqueBackground(RenderObject& obj)
{
if (!obj.isDocumentElement())
return false;
// The background is opaque only if we're the root document, since iframes with
// no background in the child document should show the parent's background.
bool isOpaque = true;
Element* ownerElement = obj.document().ownerElement();
if (ownerElement) {
if (!isHTMLFrameElement(*ownerElement)) {
// 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 = obj.document().body();
if (body) {
// Can't scroll a frameset document anyway.
isOpaque = body->hasTagName(HTMLNames::framesetTag);
} else {
// FIXME: SVG specific behavior should be in the SVG code.
// SVG documents and XML documents with SVG root nodes are transparent.
isOpaque = !obj.document().hasSVGRootNode();
}
}
} else if (obj.view()->frameView()) {
isOpaque = !obj.view()->frameView()->isTransparent();
}
return isOpaque;
}
static inline int getSpace(int areaSize, int tileSize)
{
int numberOfTiles = areaSize / tileSize;
int space = -1;
if (numberOfTiles > 1)
space = lroundf((float)(areaSize - numberOfTiles * tileSize) / (numberOfTiles - 1));
return space;
}
void BoxPainter::calculateBackgroundImageGeometry(RenderBoxModelObject& obj, const RenderLayerModelObject* paintContainer, const FillLayer& fillLayer, const LayoutRect& paintRect,
BackgroundImageGeometry& geometry, RenderObject* backgroundObject)
{
LayoutUnit left = 0;
LayoutUnit top = 0;
IntSize positioningAreaSize;
IntRect snappedPaintRect = pixelSnappedIntRect(paintRect);
// Determine the background positioning area and set destRect to the background painting area.
// destRect will be adjusted later if the background is non-repeating.
// FIXME: transforms spec says that fixed backgrounds behave like scroll inside transforms.
bool fixedAttachment = fillLayer.attachment() == FixedBackgroundAttachment;
if (RuntimeEnabledFeatures::fastMobileScrollingEnabled()) {
// As a side effect of an optimization to blit on scroll, we do not honor the CSS
// property "background-attachment: fixed" because it may result in rendering
// artifacts. Note, these artifacts only appear if we are blitting on scroll of
// a page that has fixed background images.
fixedAttachment = false;
}
if (!fixedAttachment) {
geometry.setDestRect(snappedPaintRect);
LayoutUnit right = 0;
LayoutUnit bottom = 0;
// Scroll and Local.
if (fillLayer.origin() != BorderFillBox) {
left = obj.borderLeft();
right = obj.borderRight();
top = obj.borderTop();
bottom = obj.borderBottom();
if (fillLayer.origin() == ContentFillBox) {
left += obj.paddingLeft();
right += obj.paddingRight();
top += obj.paddingTop();
bottom += obj.paddingBottom();
}
}
// The background of the box generated by the root element covers the entire canvas including
// its margins. Since those were added in already, we have to factor them out when computing
// the background positioning area.
if (obj.isDocumentElement()) {
positioningAreaSize = pixelSnappedIntSize(toRenderBox(&obj)->size() - LayoutSize(left + right, top + bottom), toRenderBox(&obj)->location());
left += obj.marginLeft();
top += obj.marginTop();
} else {
positioningAreaSize = pixelSnappedIntSize(paintRect.size() - LayoutSize(left + right, top + bottom), paintRect.location());
}
} else {
geometry.setHasNonLocalGeometry();
IntRect viewportRect = pixelSnappedIntRect(obj.viewRect());
if (fixedBackgroundPaintsInLocalCoordinates(obj))
viewportRect.setLocation(IntPoint());
else if (FrameView* frameView = obj.view()->frameView())
viewportRect.setLocation(IntPoint(frameView->scrollOffsetForFixedPosition()));
if (paintContainer) {
IntPoint absoluteContainerOffset = roundedIntPoint(paintContainer->localToAbsolute(FloatPoint()));
viewportRect.moveBy(-absoluteContainerOffset);
}
geometry.setDestRect(pixelSnappedIntRect(viewportRect));
positioningAreaSize = geometry.destRect().size();
}
const RenderObject* clientForBackgroundImage = backgroundObject ? backgroundObject : &obj;
IntSize fillTileSize = calculateFillTileSize(obj, fillLayer, positioningAreaSize);
fillLayer.image()->setContainerSizeForRenderer(clientForBackgroundImage, fillTileSize, obj.style()->effectiveZoom());
geometry.setTileSize(fillTileSize);
EFillRepeat backgroundRepeatX = fillLayer.repeatX();
EFillRepeat backgroundRepeatY = fillLayer.repeatY();
int availableWidth = positioningAreaSize.width() - geometry.tileSize().width();
int availableHeight = positioningAreaSize.height() - geometry.tileSize().height();
LayoutUnit computedXPosition = roundedMinimumValueForLength(fillLayer.xPosition(), availableWidth);
if (backgroundRepeatX == RoundFill && positioningAreaSize.width() > 0 && fillTileSize.width() > 0) {
long nrTiles = std::max(1l, lroundf((float)positioningAreaSize.width() / fillTileSize.width()));
if (fillLayer.size().size.height().isAuto() && backgroundRepeatY != RoundFill) {
fillTileSize.setHeight(fillTileSize.height() * positioningAreaSize.width() / (nrTiles * fillTileSize.width()));
}
fillTileSize.setWidth(positioningAreaSize.width() / nrTiles);
geometry.setTileSize(fillTileSize);
geometry.setPhaseX(geometry.tileSize().width() ? geometry.tileSize().width() - roundToInt(computedXPosition + left) % geometry.tileSize().width() : 0);
geometry.setSpaceSize(IntSize());
}
LayoutUnit computedYPosition = roundedMinimumValueForLength(fillLayer.yPosition(), availableHeight);
if (backgroundRepeatY == RoundFill && positioningAreaSize.height() > 0 && fillTileSize.height() > 0) {
long nrTiles = std::max(1l, lroundf((float)positioningAreaSize.height() / fillTileSize.height()));
if (fillLayer.size().size.width().isAuto() && backgroundRepeatX != RoundFill) {
fillTileSize.setWidth(fillTileSize.width() * positioningAreaSize.height() / (nrTiles * fillTileSize.height()));
}
fillTileSize.setHeight(positioningAreaSize.height() / nrTiles);
geometry.setTileSize(fillTileSize);
geometry.setPhaseY(geometry.tileSize().height() ? geometry.tileSize().height() - roundToInt(computedYPosition + top) % geometry.tileSize().height() : 0);
geometry.setSpaceSize(IntSize());
}
if (backgroundRepeatX == RepeatFill) {
geometry.setPhaseX(geometry.tileSize().width() ? geometry.tileSize().width() - roundToInt(computedXPosition + left) % geometry.tileSize().width() : 0);
geometry.setSpaceSize(IntSize());
} else if (backgroundRepeatX == SpaceFill && fillTileSize.width() > 0) {
int space = getSpace(positioningAreaSize.width(), geometry.tileSize().width());
int actualWidth = geometry.tileSize().width() + space;
if (space >= 0) {
computedXPosition = roundedMinimumValueForLength(Length(), availableWidth);
geometry.setSpaceSize(IntSize(space, 0));
geometry.setPhaseX(actualWidth ? actualWidth - roundToInt(computedXPosition + left) % actualWidth : 0);
} else {
backgroundRepeatX = NoRepeatFill;
}
}
if (backgroundRepeatX == NoRepeatFill) {
int xOffset = fillLayer.backgroundXOrigin() == RightEdge ? availableWidth - computedXPosition : computedXPosition;
geometry.setNoRepeatX(left + xOffset);
geometry.setSpaceSize(IntSize(0, geometry.spaceSize().height()));
}
if (backgroundRepeatY == RepeatFill) {
geometry.setPhaseY(geometry.tileSize().height() ? geometry.tileSize().height() - roundToInt(computedYPosition + top) % geometry.tileSize().height() : 0);
geometry.setSpaceSize(IntSize(geometry.spaceSize().width(), 0));
} else if (backgroundRepeatY == SpaceFill && fillTileSize.height() > 0) {
int space = getSpace(positioningAreaSize.height(), geometry.tileSize().height());
int actualHeight = geometry.tileSize().height() + space;
if (space >= 0) {
computedYPosition = roundedMinimumValueForLength(Length(), availableHeight);
geometry.setSpaceSize(IntSize(geometry.spaceSize().width(), space));
geometry.setPhaseY(actualHeight ? actualHeight - roundToInt(computedYPosition + top) % actualHeight : 0);
} else {
backgroundRepeatY = NoRepeatFill;
}
}
if (backgroundRepeatY == NoRepeatFill) {
int yOffset = fillLayer.backgroundYOrigin() == BottomEdge ? availableHeight - computedYPosition : computedYPosition;
geometry.setNoRepeatY(top + yOffset);
geometry.setSpaceSize(IntSize(geometry.spaceSize().width(), 0));
}
if (fixedAttachment)
geometry.useFixedAttachment(snappedPaintRect.location());
geometry.clip(snappedPaintRect);
}
InterpolationQuality BoxPainter::chooseInterpolationQuality(RenderBoxModelObject& obj, GraphicsContext* context, Image* image, const void* layer, const LayoutSize& size)
{
return ImageQualityController::imageQualityController()->chooseInterpolationQuality(context, &obj, image, layer, size);
}
bool BoxPainter::fixedBackgroundPaintsInLocalCoordinates(const RenderObject& obj)
{
if (!obj.isDocumentElement())
return false;
if (obj.view()->frameView() && obj.view()->frameView()->paintBehavior() & PaintBehaviorFlattenCompositingLayers)
return false;
RenderLayer* rootLayer = obj.view()->layer();
if (!rootLayer || rootLayer->compositingState() == NotComposited)
return false;
return rootLayer->compositedLayerMapping()->backgroundLayerPaintsFixedRootBackground();
}
static inline void applySubPixelHeuristicForTileSize(LayoutSize& tileSize, const IntSize& positioningAreaSize)
{
tileSize.setWidth(positioningAreaSize.width() - tileSize.width() <= 1 ? tileSize.width().ceil() : tileSize.width().floor());
tileSize.setHeight(positioningAreaSize.height() - tileSize.height() <= 1 ? tileSize.height().ceil() : tileSize.height().floor());
}
IntSize BoxPainter::calculateFillTileSize(const RenderBoxModelObject& obj, const FillLayer& fillLayer, const IntSize& positioningAreaSize)
{
StyleImage* image = fillLayer.image();
EFillSizeType type = fillLayer.size().type;
IntSize imageIntrinsicSize = obj.calculateImageIntrinsicDimensions(image, positioningAreaSize, RenderBoxModelObject::ScaleByEffectiveZoom);
imageIntrinsicSize.scale(1 / image->imageScaleFactor(), 1 / image->imageScaleFactor());
switch (type) {
case SizeLength: {
LayoutSize tileSize = positioningAreaSize;
Length layerWidth = fillLayer.size().size.width();
Length layerHeight = fillLayer.size().size.height();
if (layerWidth.isFixed())
tileSize.setWidth(layerWidth.value());
else if (layerWidth.isPercent())
tileSize.setWidth(valueForLength(layerWidth, positioningAreaSize.width()));
if (layerHeight.isFixed())
tileSize.setHeight(layerHeight.value());
else if (layerHeight.isPercent())
tileSize.setHeight(valueForLength(layerHeight, positioningAreaSize.height()));
applySubPixelHeuristicForTileSize(tileSize, positioningAreaSize);
// If one of the values is auto we have to use the appropriate
// scale to maintain our aspect ratio.
if (layerWidth.isAuto() && !layerHeight.isAuto()) {
if (imageIntrinsicSize.height())
tileSize.setWidth(imageIntrinsicSize.width() * tileSize.height() / imageIntrinsicSize.height());
} else if (!layerWidth.isAuto() && layerHeight.isAuto()) {
if (imageIntrinsicSize.width())
tileSize.setHeight(imageIntrinsicSize.height() * tileSize.width() / imageIntrinsicSize.width());
} else if (layerWidth.isAuto() && layerHeight.isAuto()) {
// If both width and height are auto, use the image's intrinsic size.
tileSize = imageIntrinsicSize;
}
tileSize.clampNegativeToZero();
return flooredIntSize(tileSize);
}
case SizeNone: {
// If both values are ‘auto’ then the intrinsic width and/or height of the image should be used, if any.
if (!imageIntrinsicSize.isEmpty())
return imageIntrinsicSize;
// If the image has neither an intrinsic width nor an intrinsic height, its size is determined as for ‘contain’.
type = Contain;
}
case Contain:
case Cover: {
float horizontalScaleFactor = imageIntrinsicSize.width()
? static_cast<float>(positioningAreaSize.width()) / imageIntrinsicSize.width() : 1;
float verticalScaleFactor = imageIntrinsicSize.height()
? static_cast<float>(positioningAreaSize.height()) / imageIntrinsicSize.height() : 1;
float scaleFactor = type == Contain ? std::min(horizontalScaleFactor, verticalScaleFactor) : std::max(horizontalScaleFactor, verticalScaleFactor);
return IntSize(std::max(1l, lround(imageIntrinsicSize.width() * scaleFactor)), std::max(1l, lround(imageIntrinsicSize.height() * scaleFactor)));
}
}
ASSERT_NOT_REACHED();
return IntSize();
}
static LayoutUnit computeBorderImageSide(const BorderImageLength& borderSlice, LayoutUnit borderSide, LayoutUnit imageSide, LayoutUnit boxExtent)
{
if (borderSlice.isNumber())
return borderSlice.number() * borderSide;
if (borderSlice.length().isAuto())
return imageSide;
return valueForLength(borderSlice.length(), boxExtent);
}
bool BoxPainter::paintNinePieceImage(RenderBoxModelObject& obj, GraphicsContext* graphicsContext, const LayoutRect& rect, const RenderStyle* style, const NinePieceImage& ninePieceImage, CompositeOperator op)
{
StyleImage* styleImage = ninePieceImage.image();
if (!styleImage)
return false;
if (!styleImage->isLoaded())
return true; // Never paint a nine-piece image incrementally, but don't paint the fallback borders either.
if (!styleImage->canRender(obj, style->effectiveZoom()))
return false;
// FIXME: border-image is broken with full page zooming when tiling has to happen, since the tiling function
// doesn't have any understanding of the zoom that is in effect on the tile.
LayoutRect rectWithOutsets = rect;
rectWithOutsets.expand(style->imageOutsets(ninePieceImage));
IntRect borderImageRect = pixelSnappedIntRect(rectWithOutsets);
IntSize imageSize = obj.calculateImageIntrinsicDimensions(styleImage, borderImageRect.size(), RenderBoxModelObject::DoNotScaleByEffectiveZoom);
// If both values are ‘auto’ then the intrinsic width and/or height of the image should be used, if any.
styleImage->setContainerSizeForRenderer(&obj, imageSize, style->effectiveZoom());
int imageWidth = imageSize.width();
int imageHeight = imageSize.height();
float imageScaleFactor = styleImage->imageScaleFactor();
int topSlice = std::min<int>(imageHeight, valueForLength(ninePieceImage.imageSlices().top(), imageHeight)) * imageScaleFactor;
int rightSlice = std::min<int>(imageWidth, valueForLength(ninePieceImage.imageSlices().right(), imageWidth)) * imageScaleFactor;
int bottomSlice = std::min<int>(imageHeight, valueForLength(ninePieceImage.imageSlices().bottom(), imageHeight)) * imageScaleFactor;
int leftSlice = std::min<int>(imageWidth, valueForLength(ninePieceImage.imageSlices().left(), imageWidth)) * imageScaleFactor;
ENinePieceImageRule hRule = ninePieceImage.horizontalRule();
ENinePieceImageRule vRule = ninePieceImage.verticalRule();
int topWidth = computeBorderImageSide(ninePieceImage.borderSlices().top(), style->borderTopWidth(), topSlice, borderImageRect.height());
int rightWidth = computeBorderImageSide(ninePieceImage.borderSlices().right(), style->borderRightWidth(), rightSlice, borderImageRect.width());
int bottomWidth = computeBorderImageSide(ninePieceImage.borderSlices().bottom(), style->borderBottomWidth(), bottomSlice, borderImageRect.height());
int leftWidth = computeBorderImageSide(ninePieceImage.borderSlices().left(), style->borderLeftWidth(), leftSlice, borderImageRect.width());
// Reduce the widths if they're too large.
// The spec says: Given Lwidth as the width of the border image area, Lheight as its height, and Wside as the border image width
// offset for the side, let f = min(Lwidth/(Wleft+Wright), Lheight/(Wtop+Wbottom)). If f < 1, then all W are reduced by
// multiplying them by f.
int borderSideWidth = std::max(1, leftWidth + rightWidth);
int borderSideHeight = std::max(1, topWidth + bottomWidth);
float borderSideScaleFactor = std::min((float)borderImageRect.width() / borderSideWidth, (float)borderImageRect.height() / borderSideHeight);
if (borderSideScaleFactor < 1) {
topWidth *= borderSideScaleFactor;
rightWidth *= borderSideScaleFactor;
bottomWidth *= borderSideScaleFactor;
leftWidth *= borderSideScaleFactor;
}
bool drawLeft = leftSlice > 0 && leftWidth > 0;
bool drawTop = topSlice > 0 && topWidth > 0;
bool drawRight = rightSlice > 0 && rightWidth > 0;
bool drawBottom = bottomSlice > 0 && bottomWidth > 0;
bool drawMiddle = ninePieceImage.fill() && (imageWidth - leftSlice - rightSlice) > 0 && (borderImageRect.width() - leftWidth - rightWidth) > 0
&& (imageHeight - topSlice - bottomSlice) > 0 && (borderImageRect.height() - topWidth - bottomWidth) > 0;
RefPtr<Image> image = styleImage->image(&obj, imageSize);
float destinationWidth = borderImageRect.width() - leftWidth - rightWidth;
float destinationHeight = borderImageRect.height() - topWidth - bottomWidth;
float sourceWidth = imageWidth - leftSlice - rightSlice;
float sourceHeight = imageHeight - topSlice - bottomSlice;
float leftSideScale = drawLeft ? (float)leftWidth / leftSlice : 1;
float rightSideScale = drawRight ? (float)rightWidth / rightSlice : 1;
float topSideScale = drawTop ? (float)topWidth / topSlice : 1;
float bottomSideScale = drawBottom ? (float)bottomWidth / bottomSlice : 1;
if (drawLeft) {
// Paint the top and bottom left corners.
// The top left corner rect is (tx, ty, leftWidth, topWidth)
// The rect to use from within the image is obtained from our slice, and is (0, 0, leftSlice, topSlice)
if (drawTop) {
graphicsContext->drawImage(image.get(), IntRect(borderImageRect.location(), IntSize(leftWidth, topWidth)),
LayoutRect(0, 0, leftSlice, topSlice), op);
}
// The bottom left corner rect is (tx, ty + h - bottomWidth, leftWidth, bottomWidth)
// The rect to use from within the image is (0, imageHeight - bottomSlice, leftSlice, botomSlice)
if (drawBottom) {
graphicsContext->drawImage(image.get(), IntRect(borderImageRect.x(), borderImageRect.maxY() - bottomWidth, leftWidth, bottomWidth),
LayoutRect(0, imageHeight - bottomSlice, leftSlice, bottomSlice), op);
}
// Paint the left edge.
// Have to scale and tile into the border rect.
if (sourceHeight > 0) {
graphicsContext->drawTiledImage(image.get(), IntRect(borderImageRect.x(), borderImageRect.y() + topWidth, leftWidth, destinationHeight),
IntRect(0, topSlice, leftSlice, sourceHeight), FloatSize(leftSideScale, leftSideScale), Image::StretchTile, (Image::TileRule)vRule, op);
}
}
if (drawRight) {
// Paint the top and bottom right corners
// The top right corner rect is (tx + w - rightWidth, ty, rightWidth, topWidth)
// The rect to use from within the image is obtained from our slice, and is (imageWidth - rightSlice, 0, rightSlice, topSlice)
if (drawTop) {
graphicsContext->drawImage(image.get(), IntRect(borderImageRect.maxX() - rightWidth, borderImageRect.y(), rightWidth, topWidth),
LayoutRect(imageWidth - rightSlice, 0, rightSlice, topSlice), op);
}
// The bottom right corner rect is (tx + w - rightWidth, ty + h - bottomWidth, rightWidth, bottomWidth)
// The rect to use from within the image is (imageWidth - rightSlice, imageHeight - bottomSlice, rightSlice, bottomSlice)
if (drawBottom) {
graphicsContext->drawImage(image.get(), IntRect(borderImageRect.maxX() - rightWidth, borderImageRect.maxY() - bottomWidth, rightWidth, bottomWidth),
LayoutRect(imageWidth - rightSlice, imageHeight - bottomSlice, rightSlice, bottomSlice), op);
}
// Paint the right edge.
if (sourceHeight > 0) {
graphicsContext->drawTiledImage(image.get(), IntRect(borderImageRect.maxX() - rightWidth, borderImageRect.y() + topWidth, rightWidth,
destinationHeight),
IntRect(imageWidth - rightSlice, topSlice, rightSlice, sourceHeight),
FloatSize(rightSideScale, rightSideScale),
Image::StretchTile, (Image::TileRule)vRule, op);
}
}
// Paint the top edge.
if (drawTop && sourceWidth > 0) {
graphicsContext->drawTiledImage(image.get(), IntRect(borderImageRect.x() + leftWidth, borderImageRect.y(), destinationWidth, topWidth),
IntRect(leftSlice, 0, sourceWidth, topSlice),
FloatSize(topSideScale, topSideScale), (Image::TileRule)hRule, Image::StretchTile, op);
}
// Paint the bottom edge.
if (drawBottom && sourceWidth > 0) {
graphicsContext->drawTiledImage(image.get(), IntRect(borderImageRect.x() + leftWidth, borderImageRect.maxY() - bottomWidth,
destinationWidth, bottomWidth),
IntRect(leftSlice, imageHeight - bottomSlice, sourceWidth, bottomSlice),
FloatSize(bottomSideScale, bottomSideScale),
(Image::TileRule)hRule, Image::StretchTile, op);
}
// Paint the middle.
if (drawMiddle) {
FloatSize middleScaleFactor(1, 1);
if (drawTop)
middleScaleFactor.setWidth(topSideScale);
else if (drawBottom)
middleScaleFactor.setWidth(bottomSideScale);
if (drawLeft)
middleScaleFactor.setHeight(leftSideScale);
else if (drawRight)
middleScaleFactor.setHeight(rightSideScale);
// For "stretch" rules, just override the scale factor and replace. We only had to do this for the
// center tile, since sides don't even use the scale factor unless they have a rule other than "stretch".
// The middle however can have "stretch" specified in one axis but not the other, so we have to
// correct the scale here.
if (hRule == StretchImageRule)
middleScaleFactor.setWidth(destinationWidth / sourceWidth);
if (vRule == StretchImageRule)
middleScaleFactor.setHeight(destinationHeight / sourceHeight);
graphicsContext->drawTiledImage(image.get(),
IntRect(borderImageRect.x() + leftWidth, borderImageRect.y() + topWidth, destinationWidth, destinationHeight),
IntRect(leftSlice, topSlice, sourceWidth, sourceHeight),
middleScaleFactor, (Image::TileRule)hRule, (Image::TileRule)vRule, op);
}
return true;
}
static IntRect calculateSideRect(const RoundedRect& outerBorder, const BorderEdge edges[], int side)
{
IntRect sideRect = outerBorder.rect();
int width = edges[side].width;
if (side == BSTop)
sideRect.setHeight(width);
else if (side == BSBottom)
sideRect.shiftYEdgeTo(sideRect.maxY() - width);
else if (side == BSLeft)
sideRect.setWidth(width);
else
sideRect.shiftXEdgeTo(sideRect.maxX() - width);
return sideRect;
}
enum BorderEdgeFlag {
TopBorderEdge = 1 << BSTop,
RightBorderEdge = 1 << BSRight,
BottomBorderEdge = 1 << BSBottom,
LeftBorderEdge = 1 << BSLeft,
AllBorderEdges = TopBorderEdge | BottomBorderEdge | LeftBorderEdge | RightBorderEdge
};
static inline BorderEdgeFlag edgeFlagForSide(BoxSide side)
{
return static_cast<BorderEdgeFlag>(1 << side);
}
static inline bool includesEdge(BorderEdgeFlags flags, BoxSide side)
{
return flags & edgeFlagForSide(side);
}
inline bool styleRequiresClipPolygon(EBorderStyle style)
{
return style == DOTTED || style == DASHED; // These are drawn with a stroke, so we have to clip to get corner miters.
}
static bool borderStyleFillsBorderArea(EBorderStyle style)
{
return !(style == DOTTED || style == DASHED || style == DOUBLE);
}
static bool borderStyleHasInnerDetail(EBorderStyle style)
{
return style == GROOVE || style == RIDGE || style == DOUBLE;
}
static bool borderStyleIsDottedOrDashed(EBorderStyle style)
{
return style == DOTTED || style == DASHED;
}
// OUTSET darkens the bottom and right (and maybe lightens the top and left)
// INSET darkens the top and left (and maybe lightens the bottom and right)
static inline bool borderStyleHasUnmatchedColorsAtCorner(EBorderStyle style, BoxSide side, BoxSide adjacentSide)
{
// These styles match at the top/left and bottom/right.
if (style == INSET || style == GROOVE || style == RIDGE || style == OUTSET) {
const BorderEdgeFlags topRightFlags = edgeFlagForSide(BSTop) | edgeFlagForSide(BSRight);
const BorderEdgeFlags bottomLeftFlags = edgeFlagForSide(BSBottom) | edgeFlagForSide(BSLeft);
BorderEdgeFlags flags = edgeFlagForSide(side) | edgeFlagForSide(adjacentSide);
return flags == topRightFlags || flags == bottomLeftFlags;
}
return false;
}
static inline bool colorsMatchAtCorner(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[])
{
if (edges[side].shouldRender() != edges[adjacentSide].shouldRender())
return false;
if (!edges[side].sharesColorWith(edges[adjacentSide]))
return false;
return !borderStyleHasUnmatchedColorsAtCorner(edges[side].borderStyle(), side, adjacentSide);
}
static inline bool colorNeedsAntiAliasAtCorner(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[])
{
if (!edges[side].color.hasAlpha())
return false;
if (edges[side].shouldRender() != edges[adjacentSide].shouldRender())
return false;
if (!edges[side].sharesColorWith(edges[adjacentSide]))
return true;
return borderStyleHasUnmatchedColorsAtCorner(edges[side].borderStyle(), side, adjacentSide);
}
bool BoxPainter::shouldAntialiasLines(GraphicsContext* context)
{
// FIXME: We may want to not antialias when scaled by an integral value,
// and we may want to antialias when translated by a non-integral value.
// FIXME: See crbug.com/382491. getCTM does not include scale factors applied at raster time, such
// as device zoom.
return !context->getCTM().isIdentityOrTranslationOrFlipped();
}
static bool borderWillArcInnerEdge(const LayoutSize& firstRadius, const FloatSize& secondRadius)
{
return !firstRadius.isZero() || !secondRadius.isZero();
}
// This assumes that we draw in order: top, bottom, left, right.
static inline bool willBeOverdrawn(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[])
{
switch (side) {
case BSTop:
case BSBottom:
if (edges[adjacentSide].presentButInvisible())
return false;
if (!edges[side].sharesColorWith(edges[adjacentSide]) && edges[adjacentSide].color.hasAlpha())
return false;
if (!borderStyleFillsBorderArea(edges[adjacentSide].borderStyle()))
return false;
return true;
case BSLeft:
case BSRight:
// These draw last, so are never overdrawn.
return false;
}
return false;
}
static inline bool borderStylesRequireMitre(BoxSide side, BoxSide adjacentSide, EBorderStyle style, EBorderStyle adjacentStyle)
{
if (style == DOUBLE || adjacentStyle == DOUBLE || adjacentStyle == GROOVE || adjacentStyle == RIDGE)
return true;
if (borderStyleIsDottedOrDashed(style) != borderStyleIsDottedOrDashed(adjacentStyle))
return true;
if (style != adjacentStyle)
return true;
return borderStyleHasUnmatchedColorsAtCorner(style, side, adjacentSide);
}
static bool joinRequiresMitre(BoxSide side, BoxSide adjacentSide, const BorderEdge edges[], bool allowOverdraw)
{
if ((edges[side].isTransparent && edges[adjacentSide].isTransparent) || !edges[adjacentSide].isPresent)
return false;
if (allowOverdraw && willBeOverdrawn(side, adjacentSide, edges))
return false;
if (!edges[side].sharesColorWith(edges[adjacentSide]))
return true;
if (borderStylesRequireMitre(side, adjacentSide, edges[side].borderStyle(), edges[adjacentSide].borderStyle()))
return true;
return false;
}
static IntRect calculateSideRectIncludingInner(const RoundedRect& outerBorder, const BorderEdge edges[], BoxSide side)
{
IntRect sideRect = outerBorder.rect();
int width;
switch (side) {
case BSTop:
width = sideRect.height() - edges[BSBottom].width;
sideRect.setHeight(width);
break;
case BSBottom:
width = sideRect.height() - edges[BSTop].width;
sideRect.shiftYEdgeTo(sideRect.maxY() - width);
break;
case BSLeft:
width = sideRect.width() - edges[BSRight].width;
sideRect.setWidth(width);
break;
case BSRight:
width = sideRect.width() - edges[BSLeft].width;
sideRect.shiftXEdgeTo(sideRect.maxX() - width);
break;
}
return sideRect;
}
static RoundedRect calculateAdjustedInnerBorder(const RoundedRect&innerBorder, BoxSide side)
{
// Expand the inner border as necessary to make it a rounded rect (i.e. radii contained within each edge).
// This function relies on the fact we only get radii not contained within each edge if one of the radii
// for an edge is zero, so we can shift the arc towards the zero radius corner.
RoundedRect::Radii newRadii = innerBorder.radii();
IntRect newRect = innerBorder.rect();
float overshoot;
float maxRadii;
switch (side) {
case BSTop:
overshoot = newRadii.topLeft().width() + newRadii.topRight().width() - newRect.width();
if (overshoot > 0) {
ASSERT(!(newRadii.topLeft().width() && newRadii.topRight().width()));
newRect.setWidth(newRect.width() + overshoot);
if (!newRadii.topLeft().width())
newRect.move(-overshoot, 0);
}
newRadii.setBottomLeft(IntSize(0, 0));
newRadii.setBottomRight(IntSize(0, 0));
maxRadii = std::max(newRadii.topLeft().height(), newRadii.topRight().height());
if (maxRadii > newRect.height())
newRect.setHeight(maxRadii);
break;
case BSBottom:
overshoot = newRadii.bottomLeft().width() + newRadii.bottomRight().width() - newRect.width();
if (overshoot > 0) {
ASSERT(!(newRadii.bottomLeft().width() && newRadii.bottomRight().width()));
newRect.setWidth(newRect.width() + overshoot);
if (!newRadii.bottomLeft().width())
newRect.move(-overshoot, 0);
}
newRadii.setTopLeft(IntSize(0, 0));
newRadii.setTopRight(IntSize(0, 0));
maxRadii = std::max(newRadii.bottomLeft().height(), newRadii.bottomRight().height());
if (maxRadii > newRect.height()) {
newRect.move(0, newRect.height() - maxRadii);
newRect.setHeight(maxRadii);
}
break;
case BSLeft:
overshoot = newRadii.topLeft().height() + newRadii.bottomLeft().height() - newRect.height();
if (overshoot > 0) {
ASSERT(!(newRadii.topLeft().height() && newRadii.bottomLeft().height()));
newRect.setHeight(newRect.height() + overshoot);
if (!newRadii.topLeft().height())
newRect.move(0, -overshoot);
}
newRadii.setTopRight(IntSize(0, 0));
newRadii.setBottomRight(IntSize(0, 0));
maxRadii = std::max(newRadii.topLeft().width(), newRadii.bottomLeft().width());
if (maxRadii > newRect.width())
newRect.setWidth(maxRadii);
break;
case BSRight:
overshoot = newRadii.topRight().height() + newRadii.bottomRight().height() - newRect.height();
if (overshoot > 0) {
ASSERT(!(newRadii.topRight().height() && newRadii.bottomRight().height()));
newRect.setHeight(newRect.height() + overshoot);
if (!newRadii.topRight().height())
newRect.move(0, -overshoot);
}
newRadii.setTopLeft(IntSize(0, 0));
newRadii.setBottomLeft(IntSize(0, 0));
maxRadii = std::max(newRadii.topRight().width(), newRadii.bottomRight().width());
if (maxRadii > newRect.width()) {
newRect.move(newRect.width() - maxRadii, 0);
newRect.setWidth(maxRadii);
}
break;
}
return RoundedRect(newRect, newRadii);
}
void BoxPainter::clipBorderSideForComplexInnerPath(GraphicsContext* graphicsContext, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
BoxSide side, const BorderEdge edges[])
{
graphicsContext->clip(calculateSideRectIncludingInner(outerBorder, edges, side));
RoundedRect adjustedInnerRect = calculateAdjustedInnerBorder(innerBorder, side);
if (!adjustedInnerRect.isEmpty())
graphicsContext->clipOutRoundedRect(adjustedInnerRect);
}
static bool allCornersClippedOut(const RoundedRect& border, const LayoutRect& clipRect)
{
LayoutRect boundingRect = border.rect();
if (clipRect.contains(boundingRect))
return false;
RoundedRect::Radii radii = border.radii();
LayoutRect topLeftRect(boundingRect.location(), radii.topLeft());
if (clipRect.intersects(topLeftRect))
return false;
LayoutRect topRightRect(boundingRect.location(), radii.topRight());
topRightRect.setX(boundingRect.maxX() - topRightRect.width());
if (clipRect.intersects(topRightRect))
return false;
LayoutRect bottomLeftRect(boundingRect.location(), radii.bottomLeft());
bottomLeftRect.setY(boundingRect.maxY() - bottomLeftRect.height());
if (clipRect.intersects(bottomLeftRect))
return false;
LayoutRect bottomRightRect(boundingRect.location(), radii.bottomRight());
bottomRightRect.setX(boundingRect.maxX() - bottomRightRect.width());
bottomRightRect.setY(boundingRect.maxY() - bottomRightRect.height());
if (clipRect.intersects(bottomRightRect))
return false;
return true;
}
void BoxPainter::paintBorder(RenderBoxModelObject& obj, const PaintInfo& info, const LayoutRect& rect, const RenderStyle* style, BackgroundBleedAvoidance bleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
GraphicsContext* graphicsContext = info.context;
// border-image is not affected by border-radius.
if (paintNinePieceImage(obj, graphicsContext, rect, style, style->borderImage()))
return;
BorderEdge edges[4];
style->getBorderEdgeInfo(edges, includeLogicalLeftEdge, includeLogicalRightEdge);
RoundedRect outerBorder = style->getRoundedBorderFor(rect, includeLogicalLeftEdge, includeLogicalRightEdge);
RoundedRect innerBorder = style->getRoundedInnerBorderFor(borderInnerRectAdjustedForBleedAvoidance(graphicsContext, rect, bleedAvoidance), includeLogicalLeftEdge, includeLogicalRightEdge);
if (outerBorder.rect().isEmpty())
return;
bool haveAlphaColor = false;
bool haveAllSolidEdges = true;
bool haveAllDoubleEdges = true;
int numEdgesVisible = 4;
bool allEdgesShareColor = true;
bool allEdgesShareWidth = true;
int firstVisibleEdge = -1;
BorderEdgeFlags edgesToDraw = 0;
for (int i = BSTop; i <= BSLeft; ++i) {
const BorderEdge& currEdge = edges[i];
if (edges[i].shouldRender())
edgesToDraw |= edgeFlagForSide(static_cast<BoxSide>(i));
if (currEdge.presentButInvisible()) {
--numEdgesVisible;
allEdgesShareColor = false;
allEdgesShareWidth = false;
continue;
}
if (!currEdge.shouldRender()) {
--numEdgesVisible;
continue;
}
if (firstVisibleEdge == -1) {
firstVisibleEdge = i;
} else {
if (currEdge.color != edges[firstVisibleEdge].color)
allEdgesShareColor = false;
if (currEdge.width != edges[firstVisibleEdge].width)
allEdgesShareWidth = false;
}
if (currEdge.color.hasAlpha())
haveAlphaColor = true;
if (currEdge.borderStyle() != SOLID)
haveAllSolidEdges = false;
if (currEdge.borderStyle() != DOUBLE)
haveAllDoubleEdges = false;
}
// If no corner intersects the clip region, we can pretend outerBorder is
// rectangular to improve performance.
if (haveAllSolidEdges && outerBorder.isRounded() && allCornersClippedOut(outerBorder, info.rect))
outerBorder.setRadii(RoundedRect::Radii());
// isRenderable() check avoids issue described in https://bugs.webkit.org/show_bug.cgi?id=38787
if ((haveAllSolidEdges || haveAllDoubleEdges) && allEdgesShareColor && innerBorder.isRenderable()) {
// Fast path for drawing all solid edges and all unrounded double edges
if (numEdgesVisible == 4 && (outerBorder.isRounded() || haveAlphaColor)
&& (haveAllSolidEdges || (!outerBorder.isRounded() && !innerBorder.isRounded()))) {
Path path;
if (outerBorder.isRounded() && allEdgesShareWidth) {
// Very fast path for single stroked round rect with circular corners
graphicsContext->fillBetweenRoundedRects(outerBorder, innerBorder, edges[firstVisibleEdge].color);
return;
}
if (outerBorder.isRounded() && bleedAvoidance != BackgroundBleedClipBackground)
path.addRoundedRect(outerBorder);
else
path.addRect(outerBorder.rect());
if (haveAllDoubleEdges) {
IntRect innerThirdRect = outerBorder.rect();
IntRect outerThirdRect = outerBorder.rect();
for (int side = BSTop; side <= BSLeft; ++side) {
int outerWidth;
int innerWidth;
edges[side].getDoubleBorderStripeWidths(outerWidth, innerWidth);
if (side == BSTop) {
innerThirdRect.shiftYEdgeTo(innerThirdRect.y() + innerWidth);
outerThirdRect.shiftYEdgeTo(outerThirdRect.y() + outerWidth);
} else if (side == BSBottom) {
innerThirdRect.setHeight(innerThirdRect.height() - innerWidth);
outerThirdRect.setHeight(outerThirdRect.height() - outerWidth);
} else if (side == BSLeft) {
innerThirdRect.shiftXEdgeTo(innerThirdRect.x() + innerWidth);
outerThirdRect.shiftXEdgeTo(outerThirdRect.x() + outerWidth);
} else {
innerThirdRect.setWidth(innerThirdRect.width() - innerWidth);
outerThirdRect.setWidth(outerThirdRect.width() - outerWidth);
}
}
RoundedRect outerThird = outerBorder;
RoundedRect innerThird = innerBorder;
innerThird.setRect(innerThirdRect);
outerThird.setRect(outerThirdRect);
if (outerThird.isRounded() && bleedAvoidance != BackgroundBleedClipBackground)
path.addRoundedRect(outerThird);
else
path.addRect(outerThird.rect());
if (innerThird.isRounded() && bleedAvoidance != BackgroundBleedClipBackground)
path.addRoundedRect(innerThird);
else
path.addRect(innerThird.rect());
}
if (innerBorder.isRounded())
path.addRoundedRect(innerBorder);
else
path.addRect(innerBorder.rect());
graphicsContext->setFillRule(RULE_EVENODD);
graphicsContext->setFillColor(edges[firstVisibleEdge].color);
graphicsContext->fillPath(path);
return;
}
// Avoid creating transparent layers
if (haveAllSolidEdges && numEdgesVisible != 4 && !outerBorder.isRounded() && haveAlphaColor) {
Path path;
for (int i = BSTop; i <= BSLeft; ++i) {
const BorderEdge& currEdge = edges[i];
if (currEdge.shouldRender()) {
IntRect sideRect = calculateSideRect(outerBorder, edges, i);
path.addRect(sideRect);
}
}
graphicsContext->setFillRule(RULE_NONZERO);
graphicsContext->setFillColor(edges[firstVisibleEdge].color);
graphicsContext->fillPath(path);
return;
}
}
bool clipToOuterBorder = outerBorder.isRounded();
GraphicsContextStateSaver stateSaver(*graphicsContext, clipToOuterBorder);
if (clipToOuterBorder) {
// Clip to the inner and outer radii rects.
if (bleedAvoidance != BackgroundBleedClipBackground)
graphicsContext->clipRoundedRect(outerBorder);
// isRenderable() check avoids issue described in https://bugs.webkit.org/show_bug.cgi?id=38787
// The inside will be clipped out later (in clipBorderSideForComplexInnerPath)
if (innerBorder.isRenderable() && !innerBorder.isEmpty())
graphicsContext->clipOutRoundedRect(innerBorder);
}
// If only one edge visible antialiasing doesn't create seams
bool antialias = shouldAntialiasLines(graphicsContext) || numEdgesVisible == 1;
RoundedRect unadjustedInnerBorder = (bleedAvoidance == BackgroundBleedBackgroundOverBorder) ? style->getRoundedInnerBorderFor(rect, includeLogicalLeftEdge, includeLogicalRightEdge) : innerBorder;
IntPoint innerBorderAdjustment(innerBorder.rect().x() - unadjustedInnerBorder.rect().x(), innerBorder.rect().y() - unadjustedInnerBorder.rect().y());
if (haveAlphaColor)
paintTranslucentBorderSides(obj, graphicsContext, style, outerBorder, unadjustedInnerBorder, innerBorderAdjustment, edges, edgesToDraw, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias);
else
paintBorderSides(obj, graphicsContext, style, outerBorder, unadjustedInnerBorder, innerBorderAdjustment, edges, edgesToDraw, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias);
}
static inline bool includesAdjacentEdges(BorderEdgeFlags flags)
{
return (flags & (TopBorderEdge | RightBorderEdge)) == (TopBorderEdge | RightBorderEdge)
|| (flags & (RightBorderEdge | BottomBorderEdge)) == (RightBorderEdge | BottomBorderEdge)
|| (flags & (BottomBorderEdge | LeftBorderEdge)) == (BottomBorderEdge | LeftBorderEdge)
|| (flags & (LeftBorderEdge | TopBorderEdge)) == (LeftBorderEdge | TopBorderEdge);
}
void BoxPainter::paintTranslucentBorderSides(RenderObject& obj, GraphicsContext* graphicsContext, const RenderStyle* style, const RoundedRect& outerBorder, const RoundedRect& innerBorder, const IntPoint& innerBorderAdjustment,
const BorderEdge edges[], BorderEdgeFlags edgesToDraw, BackgroundBleedAvoidance bleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias)
{
// willBeOverdrawn assumes that we draw in order: top, bottom, left, right.
// This is different from BoxSide enum order.
static const BoxSide paintOrder[] = { BSTop, BSBottom, BSLeft, BSRight };
while (edgesToDraw) {
// Find undrawn edges sharing a color.
Color commonColor;
BorderEdgeFlags commonColorEdgeSet = 0;
for (size_t i = 0; i < sizeof(paintOrder) / sizeof(paintOrder[0]); ++i) {
BoxSide currSide = paintOrder[i];
if (!includesEdge(edgesToDraw, currSide))
continue;
bool includeEdge;
if (!commonColorEdgeSet) {
commonColor = edges[currSide].color;
includeEdge = true;
} else {
includeEdge = edges[currSide].color == commonColor;
}
if (includeEdge)
commonColorEdgeSet |= edgeFlagForSide(currSide);
}
bool useTransparencyLayer = includesAdjacentEdges(commonColorEdgeSet) && commonColor.hasAlpha();
if (useTransparencyLayer) {
graphicsContext->beginTransparencyLayer(static_cast<float>(commonColor.alpha()) / 255);
commonColor = Color(commonColor.red(), commonColor.green(), commonColor.blue());
}
paintBorderSides(obj, graphicsContext, style, outerBorder, innerBorder, innerBorderAdjustment, edges, commonColorEdgeSet, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, &commonColor);
if (useTransparencyLayer)
graphicsContext->endLayer();
edgesToDraw &= ~commonColorEdgeSet;
}
}
LayoutRect BoxPainter::borderInnerRectAdjustedForBleedAvoidance(GraphicsContext* context, const LayoutRect& rect, BackgroundBleedAvoidance bleedAvoidance)
{
// We shrink the rectangle by one pixel on each side to make it fully overlap the anti-aliased background border
return (bleedAvoidance == BackgroundBleedBackgroundOverBorder) ? shrinkRectByOnePixel(context, rect) : rect;
}
void BoxPainter::paintOneBorderSide(RenderObject& obj, GraphicsContext* graphicsContext, const RenderStyle* style, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
const IntRect& sideRect, BoxSide side, BoxSide adjacentSide1, BoxSide adjacentSide2, const BorderEdge edges[], const Path* path,
BackgroundBleedAvoidance bleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias, const Color* overrideColor)
{
const BorderEdge& edgeToRender = edges[side];
ASSERT(edgeToRender.width);
const BorderEdge& adjacentEdge1 = edges[adjacentSide1];
const BorderEdge& adjacentEdge2 = edges[adjacentSide2];
bool mitreAdjacentSide1 = joinRequiresMitre(side, adjacentSide1, edges, !antialias);
bool mitreAdjacentSide2 = joinRequiresMitre(side, adjacentSide2, edges, !antialias);
bool adjacentSide1StylesMatch = colorsMatchAtCorner(side, adjacentSide1, edges);
bool adjacentSide2StylesMatch = colorsMatchAtCorner(side, adjacentSide2, edges);
const Color& colorToPaint = overrideColor ? *overrideColor : edgeToRender.color;
if (path) {
GraphicsContextStateSaver stateSaver(*graphicsContext);
if (innerBorder.isRenderable())
clipBorderSidePolygon(graphicsContext, outerBorder, innerBorder, side, adjacentSide1StylesMatch, adjacentSide2StylesMatch);
else
clipBorderSideForComplexInnerPath(graphicsContext, outerBorder, innerBorder, side, edges);
float thickness = std::max(std::max(edgeToRender.width, adjacentEdge1.width), adjacentEdge2.width);
drawBoxSideFromPath(graphicsContext, outerBorder.rect(), *path, edges, edgeToRender.width, thickness, side, style,
colorToPaint, edgeToRender.borderStyle(), bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
} else {
bool clipForStyle = styleRequiresClipPolygon(edgeToRender.borderStyle()) && (mitreAdjacentSide1 || mitreAdjacentSide2);
bool clipAdjacentSide1 = colorNeedsAntiAliasAtCorner(side, adjacentSide1, edges) && mitreAdjacentSide1;
bool clipAdjacentSide2 = colorNeedsAntiAliasAtCorner(side, adjacentSide2, edges) && mitreAdjacentSide2;
bool shouldClip = clipForStyle || clipAdjacentSide1 || clipAdjacentSide2;
GraphicsContextStateSaver clipStateSaver(*graphicsContext, shouldClip);
if (shouldClip) {
bool aliasAdjacentSide1 = clipAdjacentSide1 || (clipForStyle && mitreAdjacentSide1);
bool aliasAdjacentSide2 = clipAdjacentSide2 || (clipForStyle && mitreAdjacentSide2);
clipBorderSidePolygon(graphicsContext, outerBorder, innerBorder, side, !aliasAdjacentSide1, !aliasAdjacentSide2);
// Since we clipped, no need to draw with a mitre.
mitreAdjacentSide1 = false;
mitreAdjacentSide2 = false;
}
ObjectPainter::drawLineForBoxSide(graphicsContext, sideRect.x(), sideRect.y(), sideRect.maxX(), sideRect.maxY(), side, colorToPaint, edgeToRender.borderStyle(),
mitreAdjacentSide1 ? adjacentEdge1.width : 0, mitreAdjacentSide2 ? adjacentEdge2.width : 0, antialias);
}
}
void BoxPainter::paintBorderSides(RenderObject& obj, GraphicsContext* graphicsContext, const RenderStyle* style, const RoundedRect& outerBorder, const RoundedRect& innerBorder,
const IntPoint& innerBorderAdjustment, const BorderEdge edges[], BorderEdgeFlags edgeSet, BackgroundBleedAvoidance bleedAvoidance,
bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias, const Color* overrideColor)
{
bool renderRadii = outerBorder.isRounded();
Path roundedPath;
if (renderRadii)
roundedPath.addRoundedRect(outerBorder);
// The inner border adjustment for bleed avoidance mode BackgroundBleedBackgroundOverBorder
// is only applied to sideRect, which is okay since BackgroundBleedBackgroundOverBorder
// is only to be used for solid borders and the shape of the border painted by drawBoxSideFromPath
// only depends on sideRect when painting solid borders.
if (edges[BSTop].shouldRender() && includesEdge(edgeSet, BSTop)) {
IntRect sideRect = outerBorder.rect();
sideRect.setHeight(edges[BSTop].width + innerBorderAdjustment.y());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSTop].borderStyle()) || borderWillArcInnerEdge(innerBorder.radii().topLeft(), innerBorder.radii().topRight()));
paintOneBorderSide(obj, graphicsContext, style, outerBorder, innerBorder, sideRect, BSTop, BSLeft, BSRight, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
if (edges[BSBottom].shouldRender() && includesEdge(edgeSet, BSBottom)) {
IntRect sideRect = outerBorder.rect();
sideRect.shiftYEdgeTo(sideRect.maxY() - edges[BSBottom].width - innerBorderAdjustment.y());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSBottom].borderStyle()) || borderWillArcInnerEdge(innerBorder.radii().bottomLeft(), innerBorder.radii().bottomRight()));
paintOneBorderSide(obj, graphicsContext, style, outerBorder, innerBorder, sideRect, BSBottom, BSLeft, BSRight, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
if (edges[BSLeft].shouldRender() && includesEdge(edgeSet, BSLeft)) {
IntRect sideRect = outerBorder.rect();
sideRect.setWidth(edges[BSLeft].width + innerBorderAdjustment.x());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSLeft].borderStyle()) || borderWillArcInnerEdge(innerBorder.radii().bottomLeft(), innerBorder.radii().topLeft()));
paintOneBorderSide(obj, graphicsContext, style, outerBorder, innerBorder, sideRect, BSLeft, BSTop, BSBottom, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
if (edges[BSRight].shouldRender() && includesEdge(edgeSet, BSRight)) {
IntRect sideRect = outerBorder.rect();
sideRect.shiftXEdgeTo(sideRect.maxX() - edges[BSRight].width - innerBorderAdjustment.x());
bool usePath = renderRadii && (borderStyleHasInnerDetail(edges[BSRight].borderStyle()) || borderWillArcInnerEdge(innerBorder.radii().bottomRight(), innerBorder.radii().topRight()));
paintOneBorderSide(obj, graphicsContext, style, outerBorder, innerBorder, sideRect, BSRight, BSTop, BSBottom, edges, usePath ? &roundedPath : 0, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge, antialias, overrideColor);
}
}
void BoxPainter::drawBoxSideFromPath(GraphicsContext* graphicsContext, const LayoutRect& borderRect, const Path& borderPath, const BorderEdge edges[],
float thickness, float drawThickness, BoxSide side, const RenderStyle* style, Color color, EBorderStyle borderStyle, BackgroundBleedAvoidance bleedAvoidance,
bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
if (thickness <= 0)
return;
if (borderStyle == DOUBLE && thickness < 3)
borderStyle = SOLID;
switch (borderStyle) {
case BNONE:
case BHIDDEN:
return;
case DOTTED:
case DASHED: {
graphicsContext->setStrokeColor(color);
// The stroke is doubled here because the provided path is the
// outside edge of the border so half the stroke is clipped off.
// The extra multiplier is so that the clipping mask can antialias
// the edges to prevent jaggies.
graphicsContext->setStrokeThickness(drawThickness * 2 * 1.1f);
graphicsContext->setStrokeStyle(borderStyle == DASHED ? DashedStroke : DottedStroke);
// If the number of dashes that fit in the path is odd and non-integral then we
// will have an awkwardly-sized dash at the end of the path. To try to avoid that
// here, we simply make the whitespace dashes ever so slightly bigger.
// FIXME: This could be even better if we tried to manipulate the dash offset
// and possibly the gapLength to get the corners dash-symmetrical.
float dashLength = thickness * ((borderStyle == DASHED) ? 3.0f : 1.0f);
float gapLength = dashLength;
float numberOfDashes = borderPath.length() / dashLength;
// Don't try to show dashes if we have less than 2 dashes + 2 gaps.
// FIXME: should do this test per side.
if (numberOfDashes >= 4) {
bool evenNumberOfFullDashes = !((int)numberOfDashes % 2);
bool integralNumberOfDashes = !(numberOfDashes - (int)numberOfDashes);
if (!evenNumberOfFullDashes && !integralNumberOfDashes) {
float numberOfGaps = numberOfDashes / 2;
gapLength += (dashLength / numberOfGaps);
}
DashArray lineDash;
lineDash.append(dashLength);
lineDash.append(gapLength);
graphicsContext->setLineDash(lineDash, dashLength);
}
// FIXME: stroking the border path causes issues with tight corners:
// https://bugs.webkit.org/show_bug.cgi?id=58711
// Also, to get the best appearance we should stroke a path between the two borders.
graphicsContext->strokePath(borderPath);
return;
}
case DOUBLE: {
// Get the inner border rects for both the outer border line and the inner border line
int outerBorderTopWidth;
int innerBorderTopWidth;
edges[BSTop].getDoubleBorderStripeWidths(outerBorderTopWidth, innerBorderTopWidth);
int outerBorderRightWidth;
int innerBorderRightWidth;
edges[BSRight].getDoubleBorderStripeWidths(outerBorderRightWidth, innerBorderRightWidth);
int outerBorderBottomWidth;
int innerBorderBottomWidth;
edges[BSBottom].getDoubleBorderStripeWidths(outerBorderBottomWidth, innerBorderBottomWidth);
int outerBorderLeftWidth;
int innerBorderLeftWidth;
edges[BSLeft].getDoubleBorderStripeWidths(outerBorderLeftWidth, innerBorderLeftWidth);
// Draw inner border line
{
GraphicsContextStateSaver stateSaver(*graphicsContext);
RoundedRect innerClip = style->getRoundedInnerBorderFor(borderRect,
innerBorderTopWidth, innerBorderBottomWidth, innerBorderLeftWidth, innerBorderRightWidth,
includeLogicalLeftEdge, includeLogicalRightEdge);
graphicsContext->clipRoundedRect(innerClip);
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, SOLID, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
}
// Draw outer border line
{
GraphicsContextStateSaver stateSaver(*graphicsContext);
LayoutRect outerRect = borderRect;
if (bleedAvoidance == BackgroundBleedClipBackground) {
outerRect.inflate(1);
++outerBorderTopWidth;
++outerBorderBottomWidth;
++outerBorderLeftWidth;
++outerBorderRightWidth;
}
RoundedRect outerClip = style->getRoundedInnerBorderFor(outerRect,
outerBorderTopWidth, outerBorderBottomWidth, outerBorderLeftWidth, outerBorderRightWidth,
includeLogicalLeftEdge, includeLogicalRightEdge);
graphicsContext->clipOutRoundedRect(outerClip);
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, SOLID, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
}
return;
}
case RIDGE:
case GROOVE:
{
EBorderStyle s1;
EBorderStyle s2;
if (borderStyle == GROOVE) {
s1 = INSET;
s2 = OUTSET;
} else {
s1 = OUTSET;
s2 = INSET;
}
// Paint full border
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, s1, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
// Paint inner only
GraphicsContextStateSaver stateSaver(*graphicsContext);
LayoutUnit topWidth = edges[BSTop].usedWidth() / 2;
LayoutUnit bottomWidth = edges[BSBottom].usedWidth() / 2;
LayoutUnit leftWidth = edges[BSLeft].usedWidth() / 2;
LayoutUnit rightWidth = edges[BSRight].usedWidth() / 2;
RoundedRect clipRect = style->getRoundedInnerBorderFor(borderRect,
topWidth, bottomWidth, leftWidth, rightWidth,
includeLogicalLeftEdge, includeLogicalRightEdge);
graphicsContext->clipRoundedRect(clipRect);
drawBoxSideFromPath(graphicsContext, borderRect, borderPath, edges, thickness, drawThickness, side, style, color, s2, bleedAvoidance, includeLogicalLeftEdge, includeLogicalRightEdge);
return;
}
case INSET:
if (side == BSTop || side == BSLeft)
color = color.dark();
break;
case OUTSET:
if (side == BSBottom || side == BSRight)
color = color.dark();
break;
default:
break;
}
graphicsContext->setStrokeStyle(NoStroke);
graphicsContext->setFillColor(color);
graphicsContext->drawRect(pixelSnappedIntRect(borderRect));
}
void BoxPainter::paintBoxShadow(const PaintInfo& info, const LayoutRect& paintRect, const RenderStyle* s, ShadowStyle shadowStyle, bool includeLogicalLeftEdge, bool includeLogicalRightEdge)
{
// FIXME: Deal with border-image. Would be great to use border-image as a mask.
GraphicsContext* context = info.context;
if (!s->boxShadow())
return;
RoundedRect border = (shadowStyle == Inset) ? s->getRoundedInnerBorderFor(paintRect, includeLogicalLeftEdge, includeLogicalRightEdge)
: s->getRoundedBorderFor(paintRect, includeLogicalLeftEdge, includeLogicalRightEdge);
bool hasBorderRadius = s->hasBorderRadius();
bool isHorizontal = s->isHorizontalWritingMode();
bool hasOpaqueBackground = s->visitedDependentColor(CSSPropertyBackgroundColor).alpha() == 255;
GraphicsContextStateSaver stateSaver(*context, false);
const ShadowList* shadowList = s->boxShadow();
for (size_t i = shadowList->shadows().size(); i--; ) {
const ShadowData& shadow = shadowList->shadows()[i];
if (shadow.style() != shadowStyle)
continue;
FloatSize shadowOffset(shadow.x(), shadow.y());
float shadowBlur = shadow.blur();
float shadowSpread = shadow.spread();
if (shadowOffset.isZero() && !shadowBlur && !shadowSpread)
continue;
const Color& shadowColor = shadow.color();
if (shadow.style() == Normal) {
FloatRect fillRect = border.rect();
fillRect.inflate(shadowSpread);
if (fillRect.isEmpty())
continue;
FloatRect shadowRect(border.rect());
shadowRect.inflate(shadowBlur + shadowSpread);
shadowRect.move(shadowOffset);
// Save the state and clip, if not already done.
// The clip does not depend on any shadow-specific properties.
if (!stateSaver.saved()) {
stateSaver.save();
if (hasBorderRadius) {
RoundedRect rectToClipOut = border;
// If the box is opaque, it is unnecessary to clip it out. However, doing so saves time
// when painting the shadow. On the other hand, it introduces subpixel gaps along the
// corners. Those are avoided by insetting the clipping path by one pixel.
if (hasOpaqueBackground)
rectToClipOut.inflateWithRadii(-1);
if (!rectToClipOut.isEmpty()) {
context->clipOutRoundedRect(rectToClipOut);
}
} else {
// This IntRect is correct even with fractional shadows, because it is used for the rectangle
// of the box itself, which is always pixel-aligned.
IntRect rectToClipOut = border.rect();
// If the box is opaque, it is unnecessary to clip it out. However, doing so saves time
// when painting the shadow. On the other hand, it introduces subpixel gaps along the
// edges if they are not pixel-aligned. Those are avoided by insetting the clipping path
// by one pixel.
if (hasOpaqueBackground) {
// FIXME: The function to decide on the policy based on the transform should be a named function.
// FIXME: It's not clear if this check is right. What about integral scale factors?
// FIXME: See crbug.com/382491. The use of getCTM may also be wrong because it does not include
// device zoom applied at raster time.
AffineTransform transform = context->getCTM();
if (transform.a() != 1 || (transform.d() != 1 && transform.d() != -1) || transform.b() || transform.c())
rectToClipOut.inflate(-1);
}
if (!rectToClipOut.isEmpty()) {
context->clipOut(rectToClipOut);
}
}
}
// Draw only the shadow.
context->setShadow(shadowOffset, shadowBlur, shadowColor, DrawLooperBuilder::ShadowRespectsTransforms, DrawLooperBuilder::ShadowIgnoresAlpha, DrawShadowOnly);
if (hasBorderRadius) {
RoundedRect influenceRect(pixelSnappedIntRect(LayoutRect(shadowRect)), border.radii());
influenceRect.expandRadii(2 * shadowBlur + shadowSpread);
if (allCornersClippedOut(influenceRect, info.rect)) {
context->fillRect(fillRect, Color::black);
} else {
// TODO: support non-integer shadows - crbug.com/334829
RoundedRect roundedFillRect = border;
roundedFillRect.inflate(shadowSpread);
roundedFillRect.expandRadii(shadowSpread);
if (!roundedFillRect.isRenderable())
roundedFillRect.adjustRadii();
context->fillRoundedRect(roundedFillRect, Color::black);
}
} else {
context->fillRect(fillRect, Color::black);
}
} else {
// The inset shadow case.
GraphicsContext::Edges clippedEdges = GraphicsContext::NoEdge;
if (!includeLogicalLeftEdge) {
if (isHorizontal)
clippedEdges |= GraphicsContext::LeftEdge;
else
clippedEdges |= GraphicsContext::TopEdge;
}
if (!includeLogicalRightEdge) {
if (isHorizontal)
clippedEdges |= GraphicsContext::RightEdge;
else
clippedEdges |= GraphicsContext::BottomEdge;
}
// TODO: support non-integer shadows - crbug.com/334828
context->drawInnerShadow(border, shadowColor, flooredIntSize(shadowOffset), shadowBlur, shadowSpread, clippedEdges);
}
}
}
void BoxPainter::clipBorderSidePolygon(GraphicsContext* graphicsContext, const RoundedRect& outerBorder, const RoundedRect& innerBorder, BoxSide side, bool firstEdgeMatches, bool secondEdgeMatches)
{
FloatPoint quad[4];
const LayoutRect& outerRect = outerBorder.rect();
const LayoutRect& innerRect = innerBorder.rect();
FloatPoint centerPoint(innerRect.location().x().toFloat() + innerRect.width().toFloat() / 2, innerRect.location().y().toFloat() + innerRect.height().toFloat() / 2);
// For each side, create a quad that encompasses all parts of that side that may draw,
// including areas inside the innerBorder.
//
// 0----------------3
// 0 \ / 0
// |\ 1----------- 2 /|
// | 1 1 |
// | | | |
// | | | |
// | 2 2 |
// |/ 1------------2 \|
// 3 / \ 3
// 0----------------3
//
switch (side) {
case BSTop:
quad[0] = outerRect.minXMinYCorner();
quad[1] = innerRect.minXMinYCorner();
quad[2] = innerRect.maxXMinYCorner();
quad[3] = outerRect.maxXMinYCorner();
if (!innerBorder.radii().topLeft().isZero()) {
findIntersection(quad[0], quad[1],
FloatPoint(
quad[1].x() + innerBorder.radii().topLeft().width(),
quad[1].y()),
FloatPoint(
quad[1].x(),
quad[1].y() + innerBorder.radii().topLeft().height()),
quad[1]);
}
if (!innerBorder.radii().topRight().isZero()) {
findIntersection(quad[3], quad[2],
FloatPoint(
quad[2].x() - innerBorder.radii().topRight().width(),
quad[2].y()),
FloatPoint(
quad[2].x(),
quad[2].y() + innerBorder.radii().topRight().height()),
quad[2]);
}
break;
case BSLeft:
quad[0] = outerRect.minXMinYCorner();
quad[1] = innerRect.minXMinYCorner();
quad[2] = innerRect.minXMaxYCorner();
quad[3] = outerRect.minXMaxYCorner();
if (!innerBorder.radii().topLeft().isZero()) {
findIntersection(quad[0], quad[1],
FloatPoint(
quad[1].x() + innerBorder.radii().topLeft().width(),
quad[1].y()),
FloatPoint(
quad[1].x(),
quad[1].y() + innerBorder.radii().topLeft().height()),
quad[1]);
}
if (!innerBorder.radii().bottomLeft().isZero()) {
findIntersection(quad[3], quad[2],
FloatPoint(
quad[2].x() + innerBorder.radii().bottomLeft().width(),
quad[2].y()),
FloatPoint(
quad[2].x(),
quad[2].y() - innerBorder.radii().bottomLeft().height()),
quad[2]);
}
break;
case BSBottom:
quad[0] = outerRect.minXMaxYCorner();
quad[1] = innerRect.minXMaxYCorner();
quad[2] = innerRect.maxXMaxYCorner();
quad[3] = outerRect.maxXMaxYCorner();
if (!innerBorder.radii().bottomLeft().isZero()) {
findIntersection(quad[0], quad[1],
FloatPoint(
quad[1].x() + innerBorder.radii().bottomLeft().width(),
quad[1].y()),
FloatPoint(
quad[1].x(),
quad[1].y() - innerBorder.radii().bottomLeft().height()),
quad[1]);
}
if (!innerBorder.radii().bottomRight().isZero()) {
findIntersection(quad[3], quad[2],
FloatPoint(
quad[2].x() - innerBorder.radii().bottomRight().width(),
quad[2].y()),
FloatPoint(
quad[2].x(),
quad[2].y() - innerBorder.radii().bottomRight().height()),
quad[2]);
}
break;
case BSRight:
quad[0] = outerRect.maxXMinYCorner();
quad[1] = innerRect.maxXMinYCorner();
quad[2] = innerRect.maxXMaxYCorner();
quad[3] = outerRect.maxXMaxYCorner();
if (!innerBorder.radii().topRight().isZero()) {
findIntersection(quad[0], quad[1],
FloatPoint(
quad[1].x() - innerBorder.radii().topRight().width(),
quad[1].y()),
FloatPoint(
quad[1].x(),
quad[1].y() + innerBorder.radii().topRight().height()),
quad[1]);
}
if (!innerBorder.radii().bottomRight().isZero()) {
findIntersection(quad[3], quad[2],
FloatPoint(
quad[2].x() - innerBorder.radii().bottomRight().width(),
quad[2].y()),
FloatPoint(
quad[2].x(),
quad[2].y() - innerBorder.radii().bottomRight().height()),
quad[2]);
}
break;
}
// If the border matches both of its adjacent sides, don't anti-alias the clip, and
// if neither side matches, anti-alias the clip.
if (firstEdgeMatches == secondEdgeMatches) {
graphicsContext->clipPolygon(4, quad, !firstEdgeMatches);
return;
}
// If antialiasing settings for the first edge and second edge is different,
// they have to be addressed separately. We do this by breaking the quad into
// two parallelograms, made by moving quad[1] and quad[2].
float ax = quad[1].x() - quad[0].x();
float ay = quad[1].y() - quad[0].y();
float bx = quad[2].x() - quad[1].x();
float by = quad[2].y() - quad[1].y();
float cx = quad[3].x() - quad[2].x();
float cy = quad[3].y() - quad[2].y();
const static float kEpsilon = 1e-2f;
float r1, r2;
if (fabsf(bx) < kEpsilon && fabsf(by) < kEpsilon) {
// The quad was actually a triangle.
r1 = r2 = 1.0f;
} else {
// Extend parallelogram a bit to hide calculation error
const static float kExtendFill = 1e-2f;
r1 = (-ax * by + ay * bx) / (cx * by - cy * bx) + kExtendFill;
r2 = (-cx * by + cy * bx) / (ax * by - ay * bx) + kExtendFill;
}
FloatPoint firstQuad[4];
firstQuad[0] = quad[0];
firstQuad[1] = quad[1];
firstQuad[2] = FloatPoint(quad[3].x() + r2 * ax, quad[3].y() + r2 * ay);
firstQuad[3] = quad[3];
graphicsContext->clipPolygon(4, firstQuad, !firstEdgeMatches);
FloatPoint secondQuad[4];
secondQuad[0] = quad[0];
secondQuad[1] = FloatPoint(quad[0].x() - r1 * cx, quad[0].y() - r1 * cy);
secondQuad[2] = quad[2];
secondQuad[3] = quad[3];
graphicsContext->clipPolygon(4, secondQuad, !secondEdgeMatches);
}
} // namespace blink