void CompositingInputsUpdater::updateRecursive(DeprecatedPaintLayer* layer, UpdateType updateType, AncestorInfo info)
{
    if (!layer->childNeedsCompositingInputsUpdate() && updateType != ForceUpdate)
        return;

    m_geometryMap.pushMappingsToAncestor(layer, layer->parent());

    if (layer->hasCompositedDeprecatedPaintLayerMapping())
        info.enclosingCompositedLayer = layer;

    if (layer->needsCompositingInputsUpdate()) {
        if (info.enclosingCompositedLayer)
            info.enclosingCompositedLayer->compositedDeprecatedPaintLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
        updateType = ForceUpdate;
    }

    if (updateType == ForceUpdate) {
        DeprecatedPaintLayer::AncestorDependentCompositingInputs properties;

        if (!layer->isRootLayer()) {
            properties.clippedAbsoluteBoundingBox = enclosingIntRect(m_geometryMap.absoluteRect(layer->boundingBoxForCompositingOverlapTest()));
            // FIXME: Setting the absBounds to 1x1 instead of 0x0 makes very little sense,
            // but removing this code will make JSGameBench sad.
            // See https://codereview.chromium.org/13912020/
            if (properties.clippedAbsoluteBoundingBox.isEmpty())
                properties.clippedAbsoluteBoundingBox.setSize(IntSize(1, 1));

            IntRect clipRect = pixelSnappedIntRect(layer->clipper().backgroundClipRect(ClipRectsContext(m_rootLayer, AbsoluteClipRects)).rect());
            properties.clippedAbsoluteBoundingBox.intersect(clipRect);

            const DeprecatedPaintLayer* parent = layer->parent();
            properties.opacityAncestor = parent->isTransparent() ? parent : parent->opacityAncestor();
            properties.transformAncestor = parent->hasTransformRelatedProperty() ? parent : parent->transformAncestor();
            properties.filterAncestor = parent->hasFilter() ? parent : parent->filterAncestor();
            bool layerIsFixedPosition = layer->layoutObject()->style()->position() == FixedPosition;
            properties.nearestFixedPositionLayer = layerIsFixedPosition ? layer : parent->nearestFixedPositionLayer();

            if (info.hasAncestorWithClipOrOverflowClip) {
                const DeprecatedPaintLayer* parentLayerOnClippingContainerChain = findParentLayerOnClippingContainerChain(layer);
                const bool parentHasClipOrOverflowClip = parentLayerOnClippingContainerChain->layoutObject()->hasClipOrOverflowClip();
                properties.clippingContainer = parentHasClipOrOverflowClip ? parentLayerOnClippingContainerChain->layoutObject() : parentLayerOnClippingContainerChain->clippingContainer();
            }

            if (info.lastScrollingAncestor) {
                const LayoutObject* containingBlock = layer->layoutObject()->containingBlock();
                const DeprecatedPaintLayer* parentLayerOnContainingBlockChain = findParentLayerOnContainingBlockChain(containingBlock);

                properties.ancestorScrollingLayer = parentLayerOnContainingBlockChain->ancestorScrollingLayer();
                if (parentLayerOnContainingBlockChain->scrollsOverflow())
                    properties.ancestorScrollingLayer = parentLayerOnContainingBlockChain;

                if (layer->layoutObject()->isOutOfFlowPositioned() && !layer->subtreeIsInvisible()) {
                    const DeprecatedPaintLayer* clippingLayer = properties.clippingContainer ? properties.clippingContainer->enclosingLayer() : layer->compositor()->rootLayer();
                    if (hasClippedStackingAncestor(layer, clippingLayer))
                        properties.clipParent = clippingLayer;
                }

                if (layer->stackingNode()->isTreatedAsStackingContextForPainting()
                    && properties.ancestorScrollingLayer
                    && !info.ancestorStackingContext->layoutObject()->isDescendantOf(properties.ancestorScrollingLayer->layoutObject()))
                    properties.scrollParent = properties.ancestorScrollingLayer;
            }
        }

        properties.hasAncestorWithClipPath = info.hasAncestorWithClipPath;
        layer->updateAncestorDependentCompositingInputs(properties);
    }

    if (layer->stackingNode()->isStackingContext())
        info.ancestorStackingContext = layer;

    if (layer->scrollsOverflow())
        info.lastScrollingAncestor = layer;

    if (layer->layoutObject()->hasClipOrOverflowClip())
        info.hasAncestorWithClipOrOverflowClip = true;

    if (layer->layoutObject()->hasClipPath())
        info.hasAncestorWithClipPath = true;

    DeprecatedPaintLayer::DescendantDependentCompositingInputs descendantProperties;
    for (DeprecatedPaintLayer* child = layer->firstChild(); child; child = child->nextSibling()) {
        updateRecursive(child, updateType, info);

        descendantProperties.hasDescendantWithClipPath |= child->hasDescendantWithClipPath() || child->layoutObject()->hasClipPath();
        descendantProperties.hasNonIsolatedDescendantWithBlendMode |= (!child->stackingNode()->isStackingContext() && child->hasNonIsolatedDescendantWithBlendMode()) || child->layoutObject()->style()->hasBlendMode();
    }

    layer->updateDescendantDependentCompositingInputs(descendantProperties);
    layer->didUpdateCompositingInputs();

    m_geometryMap.popMappingsToAncestor(layer->parent());
}

bool TextFinder::find(int identifier,
                      const WebString& searchText,
                      const WebFindOptions& options,
                      bool wrapWithinFrame,
                      bool* activeNow) {
  if (!options.findNext)
    unmarkAllTextMatches();
  else
    setMarkerActive(m_activeMatch.get(), false);

  if (m_activeMatch &&
      &m_activeMatch->ownerDocument() != ownerFrame().frame()->document())
    m_activeMatch = nullptr;

  // If the user has selected something since the last Find operation we want
  // to start from there. Otherwise, we start searching from where the last Find
  // operation left off (either a Find or a FindNext operation).
  VisibleSelection selection(ownerFrame().frame()->selection().selection());
  bool activeSelection = !selection.isNone();
  if (activeSelection) {
    m_activeMatch = firstRangeOf(selection);
    ownerFrame().frame()->selection().clear();
  }

  DCHECK(ownerFrame().frame());
  DCHECK(ownerFrame().frame()->view());
  const FindOptions findOptions =
      (options.forward ? 0 : Backwards) |
      (options.matchCase ? 0 : CaseInsensitive) |
      (wrapWithinFrame ? WrapAround : 0) |
      (options.wordStart ? AtWordStarts : 0) |
      (options.medialCapitalAsWordStart ? TreatMedialCapitalAsWordStart : 0) |
      (options.findNext ? 0 : StartInSelection);
  m_activeMatch = ownerFrame().frame()->editor().findStringAndScrollToVisible(
      searchText, m_activeMatch.get(), findOptions);

  if (!m_activeMatch) {
    // If we're finding next the next active match might not be in the current
    // frame.  In this case we don't want to clear the matches cache.
    if (!options.findNext)
      clearFindMatchesCache();

    ownerFrame().frameView()->invalidatePaintForTickmarks();
    return false;
  }

  // If the user is browsing a page with autosizing, adjust the zoom to the
  // column where the next hit has been found. Doing this when autosizing is
  // not set will result in a zoom reset on small devices.
  if (ownerFrame()
          .frame()
          ->document()
          ->textAutosizer()
          ->pageNeedsAutosizing()) {
    ownerFrame().viewImpl()->zoomToFindInPageRect(
        ownerFrame().frameView()->contentsToRootFrame(
            enclosingIntRect(LayoutObject::absoluteBoundingBoxRectForRange(
                m_activeMatch.get()))));
  }

  bool wasActiveFrame = m_currentActiveMatchFrame;
  m_currentActiveMatchFrame = true;

  bool isActive = setMarkerActive(m_activeMatch.get(), true);
  if (activeNow)
    *activeNow = isActive;

  // Make sure no node is focused. See http://crbug.com/38700.
  ownerFrame().frame()->document()->clearFocusedElement();

  // Set this frame as focused.
  ownerFrame().viewImpl()->setFocusedFrame(&ownerFrame());

  if (!options.findNext || activeSelection || !isActive) {
    // This is either an initial Find operation, a Find-next from a new
    // start point due to a selection, or new matches were found during
    // Find-next due to DOM alteration (that couldn't be set as active), so
    // we set the flag to ask the scoping effort to find the active rect for
    // us and report it back to the UI.
    m_locatingActiveRect = true;
  } else {
    if (!wasActiveFrame) {
      if (options.forward)
        m_activeMatchIndex = 0;
      else
        m_activeMatchIndex = m_lastMatchCount - 1;
    } else {
      if (options.forward)
        ++m_activeMatchIndex;
      else
        --m_activeMatchIndex;

      if (m_activeMatchIndex + 1 > m_lastMatchCount)
        m_activeMatchIndex = 0;
      else if (m_activeMatchIndex < 0)
        m_activeMatchIndex = m_lastMatchCount - 1;
    }
    WebRect selectionRect = ownerFrame().frameView()->contentsToRootFrame(
        m_activeMatch->boundingBox());
    reportFindInPageSelection(selectionRect, m_activeMatchIndex + 1,
//.........这里部分代码省略.........

static TextStream& writePositionAndStyle(TextStream& ts, const RenderObject& object)
{
    ts << " " << enclosingIntRect(const_cast<RenderObject&>(object).absoluteClippedOverflowRect());
    writeStyle(ts, object);
    return ts;
}

IntRect VisualViewport::rootFrameToViewport(const IntRect& rectInRootFrame) const
{
    // FIXME: How to snap to pixels?
    return enclosingIntRect(rootFrameToViewport(FloatRect(rectInRootFrame)));
}

IntRect RenderSVGInlineText::linesBoundingBox() const
{
    return enclosingIntRect(floatLinesBoundingBox());
}

void ImageBufferDataPrivateAccelerated::clip(GraphicsContext* context, const FloatRect& floatRect) const
{
    QPixmap alphaMask = QPixmap::fromImage(toQImage());
    IntRect rect = enclosingIntRect(floatRect);
    context->pushTransparencyLayerInternal(rect, 1.0, alphaMask);
}

void BufferedImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace styleColorSpace, CompositeOperator compositeOp)
{
    IntRect intDstRect = enclosingIntRect(dstRect);
    IntRect intSrcRect(srcRect);
    m_data->m_bitmap->draw(ctxt, intDstRect, intSrcRect, styleColorSpace, compositeOp);
}

IntRect TiledDrawingAreaProxy::webViewVisibleRect()
{
    return enclosingIntRect(FloatRect(m_webView->visibleRect()));
}

bool SVGResourceFilter::prepareFilter(GraphicsContext*& context, const RenderObject* object)
{
    m_ownerElement->buildFilter(object->objectBoundingBox());
    const SVGRenderBase* renderer = object->toSVGRenderBase();
    if (!renderer)
        return false;

    FloatRect paintRect = renderer->strokeBoundingBox();
    paintRect.unite(renderer->markerBoundingBox());

    if (shouldProcessFilter(this, m_filterBBox))
        return false;

    // clip sourceImage to filterRegion
    FloatRect clippedSourceRect = paintRect;
    clippedSourceRect.intersect(m_filterBBox);

    // scale filter size to filterRes
    FloatRect tempSourceRect = clippedSourceRect;
    if (m_filterRes) {
        m_scaleX = m_filterResSize.width() / m_filterBBox.width();
        m_scaleY = m_filterResSize.height() / m_filterBBox.height();
    }

    // scale to big sourceImage size to kMaxFilterSize
    tempSourceRect.scale(m_scaleX, m_scaleY);
    fitsInMaximumImageSize(tempSourceRect.size());

    // prepare Filters
    m_filter = SVGFilter::create(paintRect, m_filterBBox, m_effectBBoxMode);
    m_filter->setFilterResolution(FloatSize(m_scaleX, m_scaleY));

    FilterEffect* lastEffect = m_filterBuilder->lastEffect();
    if (lastEffect) {
        lastEffect->calculateEffectRect(m_filter.get());
        // at least one FilterEffect has a too big image size,
        // recalculate the effect sizes with new scale factors
        if (!fitsInMaximumImageSize(m_filter->maxImageSize())) {
            m_filter->setFilterResolution(FloatSize(m_scaleX, m_scaleY));
            lastEffect->calculateEffectRect(m_filter.get());
        }
    } else
        return false;

    clippedSourceRect.scale(m_scaleX, m_scaleY);

    // Draw the content of the current element and it's childs to a imageBuffer to get the SourceGraphic.
    // The size of the SourceGraphic is clipped to the size of the filterRegion.
    IntRect bufferRect = enclosingIntRect(clippedSourceRect);
    OwnPtr<ImageBuffer> sourceGraphic(ImageBuffer::create(bufferRect.size(), LinearRGB));
    
    if (!sourceGraphic.get())
        return false;

    GraphicsContext* sourceGraphicContext = sourceGraphic->context();
    sourceGraphicContext->translate(-clippedSourceRect.x(), -clippedSourceRect.y());
    sourceGraphicContext->scale(FloatSize(m_scaleX, m_scaleY));
    sourceGraphicContext->clearRect(FloatRect(FloatPoint(), paintRect.size()));
    m_sourceGraphicBuffer.set(sourceGraphic.release());
    m_savedContext = context;

    context = sourceGraphicContext;
    return true;
}

void NativeImageSkia::drawPattern(
    GraphicsContext* context,
    const FloatRect& floatSrcRect,
    const FloatSize& scale,
    const FloatPoint& phase,
    CompositeOperator compositeOp,
    const FloatRect& destRect,
    WebBlendMode blendMode,
    const IntSize& repeatSpacing) const
{
    FloatRect normSrcRect = floatSrcRect;
    normSrcRect.intersect(FloatRect(0, 0, bitmap().width(), bitmap().height()));
    if (destRect.isEmpty() || normSrcRect.isEmpty())
        return; // nothing to draw

    SkMatrix totalMatrix = context->getTotalMatrix();
    AffineTransform ctm = context->getCTM();
    SkScalar ctmScaleX = ctm.xScale();
    SkScalar ctmScaleY = ctm.yScale();
    totalMatrix.preScale(scale.width(), scale.height());

    // Figure out what size the bitmap will be in the destination. The
    // destination rect is the bounds of the pattern, we need to use the
    // matrix to see how big it will be.
    SkRect destRectTarget;
    totalMatrix.mapRect(&destRectTarget, normSrcRect);

    float destBitmapWidth = SkScalarToFloat(destRectTarget.width());
    float destBitmapHeight = SkScalarToFloat(destRectTarget.height());

    bool isLazyDecoded = DeferredImageDecoder::isLazyDecoded(bitmap());

    // Compute the resampling mode.
    InterpolationQuality resampling;
    if (context->isAccelerated())
        resampling = InterpolationLow;
    else if (isLazyDecoded)
        resampling = InterpolationHigh;
    else
        resampling = computeInterpolationQuality(totalMatrix, normSrcRect.width(), normSrcRect.height(), destBitmapWidth, destBitmapHeight, isDataComplete());
    resampling = limitInterpolationQuality(context, resampling);

    SkMatrix localMatrix;
    // We also need to translate it such that the origin of the pattern is the
    // origin of the destination rect, which is what WebKit expects. Skia uses
    // the coordinate system origin as the base for the pattern. If WebKit wants
    // a shifted image, it will shift it from there using the localMatrix.
    const float adjustedX = phase.x() + normSrcRect.x() * scale.width();
    const float adjustedY = phase.y() + normSrcRect.y() * scale.height();
    localMatrix.setTranslate(SkFloatToScalar(adjustedX), SkFloatToScalar(adjustedY));

    RefPtr<SkShader> shader;
    SkFilterQuality filterLevel = static_cast<SkFilterQuality>(resampling);

    // Bicubic filter is only applied to defer-decoded images, see
    // NativeImageSkia::draw for details.
    if (resampling == InterpolationHigh && !isLazyDecoded) {
        // Do nice resampling.
        filterLevel = kNone_SkFilterQuality;
        float scaleX = destBitmapWidth / normSrcRect.width();
        float scaleY = destBitmapHeight / normSrcRect.height();
        SkRect scaledSrcRect;

        // Since we are resizing the bitmap, we need to remove the scale
        // applied to the pixels in the bitmap shader. This means we need
        // CTM * localMatrix to have identity scale. Since we
        // can't modify CTM (or the rectangle will be drawn in the wrong
        // place), we must set localMatrix's scale to the inverse of
        // CTM scale.
        localMatrix.preScale(ctmScaleX ? 1 / ctmScaleX : 1, ctmScaleY ? 1 / ctmScaleY : 1);

        // The image fragment generated here is not exactly what is
        // requested. The scale factor used is approximated and image
        // fragment is slightly larger to align to integer
        // boundaries.
        SkBitmap resampled = extractScaledImageFragment(normSrcRect, scaleX, scaleY, &scaledSrcRect);
        if (repeatSpacing.isZero()) {
            shader = adoptRef(SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
        } else {
            shader = adoptRef(SkShader::CreateBitmapShader(
                createBitmapWithSpace(resampled, repeatSpacing.width() * ctmScaleX, repeatSpacing.height() * ctmScaleY),
                SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
        }
    } else {
        // Because no resizing occurred, the shader transform should be
        // set to the pattern's transform, which just includes scale.
        localMatrix.preScale(scale.width(), scale.height());

        // No need to resample before drawing.
        SkBitmap srcSubset;
        bitmap().extractSubset(&srcSubset, enclosingIntRect(normSrcRect));
        if (repeatSpacing.isZero()) {
            shader = adoptRef(SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
        } else {
            shader = adoptRef(SkShader::CreateBitmapShader(
                createBitmapWithSpace(srcSubset, repeatSpacing.width() * ctmScaleX, repeatSpacing.height() * ctmScaleY),
                SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode, &localMatrix));
        }
    }

//.........这里部分代码省略.........

IntRect EllipsisBox::selectionRect()
{
    RenderStyle* style = renderer().style(isFirstLineStyle());
    const Font& font = style->font();
    return enclosingIntRect(font.selectionRectForText(constructTextRun(&renderer(), font, m_str, style, TextRun::AllowTrailingExpansion), IntPoint(logicalLeft(), logicalTop() + root().selectionTopAdjustedForPrecedingBlock()), root().selectionHeightAdjustedForPrecedingBlock()));
}

bool TextFinder::find(int identifier, const WebString& searchText, const WebFindOptions& options, bool wrapWithinFrame, WebRect* selectionRect)
{
    if (!m_ownerFrame.frame() || !m_ownerFrame.frame()->page())
        return false;

    WebLocalFrameImpl* mainFrameImpl = m_ownerFrame.viewImpl()->mainFrameImpl();

    if (!options.findNext)
        m_ownerFrame.frame()->page()->unmarkAllTextMatches();
    else
        setMarkerActive(m_activeMatch.get(), false);

    if (m_activeMatch && &m_activeMatch->ownerDocument() != m_ownerFrame.frame()->document())
        m_activeMatch = nullptr;

    // If the user has selected something since the last Find operation we want
    // to start from there. Otherwise, we start searching from where the last Find
    // operation left off (either a Find or a FindNext operation).
    VisibleSelection selection(m_ownerFrame.frame()->selection().selection());
    bool activeSelection = !selection.isNone();
    if (activeSelection) {
        m_activeMatch = selection.firstRange().get();
        m_ownerFrame.frame()->selection().clear();
    }

    ASSERT(m_ownerFrame.frame() && m_ownerFrame.frame()->view());
    const FindOptions findOptions = (options.forward ? 0 : Backwards)
        | (options.matchCase ? 0 : CaseInsensitive)
        | (wrapWithinFrame ? WrapAround : 0)
        | (options.wordStart ? AtWordStarts : 0)
        | (options.medialCapitalAsWordStart ? TreatMedialCapitalAsWordStart : 0)
        | (options.findNext ? 0 : StartInSelection);
    m_activeMatch = m_ownerFrame.frame()->editor().findStringAndScrollToVisible(searchText, m_activeMatch.get(), findOptions);

    if (!m_activeMatch) {
        // If we're finding next the next active match might not be in the current frame.
        // In this case we don't want to clear the matches cache.
        if (!options.findNext)
            clearFindMatchesCache();

        m_ownerFrame.invalidateAll();
        return false;
    }

#if OS(ANDROID)
    m_ownerFrame.viewImpl()->zoomToFindInPageRect(m_ownerFrame.frameView()->contentsToWindow(enclosingIntRect(RenderObject::absoluteBoundingBoxRectForRange(m_activeMatch.get()))));
#endif

    setMarkerActive(m_activeMatch.get(), true);
    WebLocalFrameImpl* oldActiveFrame = mainFrameImpl->ensureTextFinder().m_currentActiveMatchFrame;
    mainFrameImpl->ensureTextFinder().m_currentActiveMatchFrame = &m_ownerFrame;

    // Make sure no node is focused. See http://crbug.com/38700.
    m_ownerFrame.frame()->document()->setFocusedElement(nullptr);

    if (!options.findNext || activeSelection) {
        // This is either a Find operation or a Find-next from a new start point
        // due to a selection, so we set the flag to ask the scoping effort
        // to find the active rect for us and report it back to the UI.
        m_locatingActiveRect = true;
    } else {
        if (oldActiveFrame != &m_ownerFrame) {
            if (options.forward)
                m_activeMatchIndexInCurrentFrame = 0;
            else
                m_activeMatchIndexInCurrentFrame = m_lastMatchCount - 1;
        } else {
            if (options.forward)
                ++m_activeMatchIndexInCurrentFrame;
            else
                --m_activeMatchIndexInCurrentFrame;

            if (m_activeMatchIndexInCurrentFrame + 1 > m_lastMatchCount)
                m_activeMatchIndexInCurrentFrame = 0;
            if (m_activeMatchIndexInCurrentFrame == -1)
                m_activeMatchIndexInCurrentFrame = m_lastMatchCount - 1;
        }
        if (selectionRect) {
            *selectionRect = m_ownerFrame.frameView()->contentsToWindow(m_activeMatch->boundingBox());
            reportFindInPageSelection(*selectionRect, m_activeMatchIndexInCurrentFrame + 1, identifier);
        }
    }

    return true;
}

FloatRect RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(FilterEffect* effect, SVGFilter* filter)
{
    FloatRect uniteRect;
    FloatRect subregionBoundingBox = effect->effectBoundaries();
    FloatRect subregion = subregionBoundingBox;

    if (effect->filterEffectType() != FilterEffectTypeTile) {
        // FETurbulence, FEImage and FEFlood don't have input effects, take the filter region as unite rect.
        if (unsigned numberOfInputEffects = effect->inputEffects().size()) {
            for (unsigned i = 0; i < numberOfInputEffects; ++i)
                uniteRect.unite(determineFilterPrimitiveSubregion(effect->inputEffect(i), filter));
        } else
            uniteRect = filter->filterRegionInUserSpace();
    } else {
        determineFilterPrimitiveSubregion(effect->inputEffect(0), filter);
        uniteRect = filter->filterRegionInUserSpace();
    }

    if (filter->effectBoundingBoxMode()) {
        subregion = uniteRect;
        // Avoid the calling of a virtual method several times.
        FloatRect targetBoundingBox = filter->targetBoundingBox();

        if (effect->hasX())
            subregion.setX(targetBoundingBox.x() + subregionBoundingBox.x() * targetBoundingBox.width());

        if (effect->hasY())
            subregion.setY(targetBoundingBox.y() + subregionBoundingBox.y() * targetBoundingBox.height());

        if (effect->hasWidth())
            subregion.setWidth(subregionBoundingBox.width() * targetBoundingBox.width());

        if (effect->hasHeight())
            subregion.setHeight(subregionBoundingBox.height() * targetBoundingBox.height());
    } else {
        if (!effect->hasX())
            subregion.setX(uniteRect.x());

        if (!effect->hasY())
            subregion.setY(uniteRect.y());

        if (!effect->hasWidth())
            subregion.setWidth(uniteRect.width());

        if (!effect->hasHeight())
            subregion.setHeight(uniteRect.height());
    }

    effect->setFilterPrimitiveSubregion(subregion);

    FloatRect absoluteSubregion = filter->mapLocalRectToAbsoluteRect(subregion);
    FloatSize filterResolution = filter->filterResolution();
    absoluteSubregion.scale(filterResolution.width(), filterResolution.height());

    // FEImage needs the unclipped subregion in absolute coordinates to determine the correct
    // destination rect in combination with preserveAspectRatio.
    if (effect->filterEffectType() == FilterEffectTypeImage)
        reinterpret_cast<FEImage*>(effect)->setAbsoluteSubregion(absoluteSubregion);

    // Clip every filter effect to the filter region.
    FloatRect absoluteScaledFilterRegion = filter->filterRegion();
    absoluteScaledFilterRegion.scale(filterResolution.width(), filterResolution.height());
    absoluteSubregion.intersect(absoluteScaledFilterRegion);

    effect->setMaxEffectRect(enclosingIntRect(absoluteSubregion));
    return subregion;
}

IntRect AffineTransform::mapRect(const IntRect &rect) const
{
    return enclosingIntRect(mapRect(FloatRect(rect)));
}

bool CullRect::intersectsCullRect(const LayoutRect& rectArg) const {
  return m_rect.intersects(enclosingIntRect(rectArg));
}

void Image::drawPattern(GraphicsContext* context,
                        const FloatRect& floatSrcRect,
                        const AffineTransform& patternTransform,
                        const FloatPoint& phase,
                        ColorSpace styleColorSpace,
                        CompositeOperator compositeOp,
                        const FloatRect& destRect)
{
    FloatRect normSrcRect = normalizeRect(floatSrcRect);
    if (destRect.isEmpty() || normSrcRect.isEmpty())
        return;  // nothing to draw

    NativeImageSkia* bitmap = nativeImageForCurrentFrame();
    if (!bitmap)
        return;

    // This is a very inexpensive operation. It will generate a new bitmap but
    // it will internally reference the old bitmap's pixels, adjusting the row
    // stride so the extra pixels appear as padding to the subsetted bitmap.
    SkBitmap srcSubset;
    SkIRect srcRect = enclosingIntRect(normSrcRect);
    bitmap->extractSubset(&srcSubset, srcRect);

    SkBitmap resampled;
    SkShader* shader;

    // Figure out what size the bitmap will be in the destination. The
    // destination rect is the bounds of the pattern, we need to use the
    // matrix to see how bit it will be.
    float destBitmapWidth, destBitmapHeight;
    TransformDimensions(patternTransform, srcRect.width(), srcRect.height(),
                        &destBitmapWidth, &destBitmapHeight);

    // Compute the resampling mode.
    ResamplingMode resampling;
    if (context->platformContext()->isPrinting())
      resampling = RESAMPLE_LINEAR;
    else {
      resampling = computeResamplingMode(*bitmap,
                                         srcRect.width(), srcRect.height(),
                                         destBitmapWidth, destBitmapHeight);
    }

    // Load the transform WebKit requested.
    SkMatrix matrix(patternTransform);

    if (resampling == RESAMPLE_AWESOME) {
        // Do nice resampling.
        SkBitmap resampled = skia::ImageOperations::Resize(srcSubset,
            skia::ImageOperations::RESIZE_LANCZOS3,
            static_cast<int>(destBitmapWidth),
            static_cast<int>(destBitmapHeight));
        shader = SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);

        // Since we just resized the bitmap, we need to undo the scale set in
        // the image transform.
        matrix.setScaleX(SkIntToScalar(1));
        matrix.setScaleY(SkIntToScalar(1));
    } else {
        // No need to do nice resampling.
        shader = SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
    }

    // We also need to translate it such that the origin of the pattern is the
    // origin of the destination rect, which is what WebKit expects. Skia uses
    // the coordinate system origin as the base for the patter. If WebKit wants
    // a shifted image, it will shift it from there using the patternTransform.
    float adjustedX = phase.x() + normSrcRect.x() *
                      narrowPrecisionToFloat(patternTransform.a());
    float adjustedY = phase.y() + normSrcRect.y() *
                      narrowPrecisionToFloat(patternTransform.d());
    matrix.postTranslate(SkFloatToScalar(adjustedX),
                         SkFloatToScalar(adjustedY));
    shader->setLocalMatrix(matrix);

    SkPaint paint;
    paint.setShader(shader)->unref();
    paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(compositeOp));
    paint.setFilterBitmap(resampling == RESAMPLE_LINEAR);

    context->platformContext()->paintSkPaint(destRect, paint);
}

void CompositingCoordinator::paintContents(const GraphicsLayer* graphicsLayer, GraphicsContext& graphicsContext, GraphicsLayerPaintingPhase, const FloatRect& clipRect)
{
    m_client->paintLayerContents(graphicsLayer, graphicsContext, enclosingIntRect(clipRect));
}

void SVGRenderBase::prepareToRenderSVGContent(RenderObject* object, RenderObject::PaintInfo& paintInfo, const FloatRect& boundingBox, SVGResourceFilter*& filter, SVGResourceFilter* rootFilter)
{
#if !ENABLE(FILTERS)
    UNUSED_PARAM(filter);
    UNUSED_PARAM(rootFilter);
#endif

    ASSERT(object);
    SVGElement* svgElement = static_cast<SVGElement*>(object->node());
    ASSERT(svgElement && svgElement->document() && svgElement->isStyled());

    SVGStyledElement* styledElement = static_cast<SVGStyledElement*>(svgElement);
    const RenderStyle* style = object->style();
    ASSERT(style);

    const SVGRenderStyle* svgStyle = style->svgStyle();
    ASSERT(svgStyle);

    // Setup transparency layers before setting up filters!
    float opacity = style->opacity(); 
    if (opacity < 1.0f) {
        paintInfo.context->clip(enclosingIntRect(boundingBox));
        paintInfo.context->beginTransparencyLayer(opacity);
    }

#if ENABLE(FILTERS)
    AtomicString filterId(svgStyle->filter());
#endif

    AtomicString clipperId(svgStyle->clipPath());
    AtomicString maskerId(svgStyle->maskElement());

    Document* document = object->document();

#if ENABLE(FILTERS)
    SVGResourceFilter* newFilter = getFilterById(document, filterId);
    if (newFilter == rootFilter) {
        // Catch <text filter="url(#foo)">Test<tspan filter="url(#foo)">123</tspan></text>.
        // The filter is NOT meant to be applied twice in that case!
        filter = 0;
        filterId = String();
    } else
        filter = newFilter;
#endif

    SVGResourceClipper* clipper = getClipperById(document, clipperId);
    SVGResourceMasker* masker = getMaskerById(document, maskerId);

#if ENABLE(FILTERS)
    if (filter) {
        filter->addClient(styledElement);
        filter->prepareFilter(paintInfo.context, object);
    } else if (!filterId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(filterId, styledElement);
#endif

    if (clipper) {
        clipper->addClient(styledElement);
        clipper->applyClip(paintInfo.context, boundingBox);
    } else if (!clipperId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(clipperId, styledElement);

    if (masker) {
        masker->addClient(styledElement);
        masker->applyMask(paintInfo.context, boundingBox);
    } else if (!maskerId.isEmpty())
        svgElement->document()->accessSVGExtensions()->addPendingResource(maskerId, styledElement);
}

// This method is called from inside paintOutline() since we call paintOutline()
// while transformed to our coord system, return local coords
void RenderPath::addFocusRingRects(Vector<IntRect>& rects, int, int) 
{
    IntRect rect = enclosingIntRect(repaintRectInLocalCoordinates());
    if (!rect.isEmpty())
        rects.append(rect);
}

void RenderSVGModelObject::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
    IntRect rect = enclosingIntRect(strokeBoundingBox());
    rect.moveBy(roundedIntPoint(accumulatedOffset));
    rects.append(rect);
}