void ViewPainter::paintBoxDecorationBackground(PaintInfo& paintInfo)
{
if (m_renderView.document().ownerElement() || !m_renderView.view())
return;
if (paintInfo.skipRootBackground())
return;
bool shouldPaintBackground = true;
Node* documentElement = m_renderView.document().documentElement();
if (RenderBox* rootBox = documentElement ? toRenderBox(documentElement->renderer()) : 0)
shouldPaintBackground = !rootFillsViewportBackground(rootBox) || !rendererObscuresBackground(rootBox);
// If painting will entirely fill the view, no need to fill the background.
if (!shouldPaintBackground)
return;
// This code typically only executes if the root element's visibility has been set to hidden,
// if there is a transform on the <html>, or if there is a page scale factor less than 1.
// Only fill with the base background color (typically white) if we're the root document,
// since iframes/frames with no background in the child document should show the parent's background.
if (!m_renderView.frameView()->isTransparent()) {
Color baseColor = m_renderView.frameView()->baseBackgroundColor();
if (baseColor.alpha()) {
CompositeOperator previousOperator = paintInfo.context->compositeOperation();
paintInfo.context->setCompositeOperation(CompositeCopy);
paintInfo.context->fillRect(paintInfo.rect, baseColor);
paintInfo.context->setCompositeOperation(previousOperator);
} else {
paintInfo.context->clearRect(paintInfo.rect);
}
}
}
void RenderView::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint&)
{
// Check to see if we are enclosed by a layer that requires complex painting rules. If so, we cannot blit
// when scrolling, and we need to use slow repaints. Examples of layers that require this are transparent layers,
// layers with reflections, or transformed layers.
// FIXME: This needs to be dynamic. We should be able to go back to blitting if we ever stop being inside
// a transform, transparency layer, etc.
Element* elt;
for (elt = document().ownerElement(); view() && elt && elt->renderer(); elt = elt->document().ownerElement()) {
RenderLayer* layer = elt->renderer()->enclosingLayer();
if (layer->cannotBlitToWindow()) {
frameView()->setCannotBlitToWindow();
break;
}
if (layer->enclosingCompositingLayerForRepaint()) {
frameView()->setCannotBlitToWindow();
break;
}
}
if (document().ownerElement() || !view())
return;
if (paintInfo.skipRootBackground())
return;
bool shouldPaintBackground = true;
Node* documentElement = document().documentElement();
if (RenderBox* rootBox = documentElement ? toRenderBox(documentElement->renderer()) : 0)
shouldPaintBackground = !rootFillsViewportBackground(rootBox) || !rendererObscuresBackground(rootBox);
// If painting will entirely fill the view, no need to fill the background.
if (!shouldPaintBackground)
return;
// This code typically only executes if the root element's visibility has been set to hidden,
// if there is a transform on the <html>, or if there is a page scale factor less than 1.
// Only fill with the base background color (typically white) if we're the root document,
// since iframes/frames with no background in the child document should show the parent's background.
if (frameView()->isTransparent()) // FIXME: This needs to be dynamic. We should be able to go back to blitting if we ever stop being transparent.
frameView()->setCannotBlitToWindow(); // The parent must show behind the child.
else {
Color baseColor = frameView()->baseBackgroundColor();
if (baseColor.alpha()) {
CompositeOperator previousOperator = paintInfo.context->compositeOperation();
paintInfo.context->setCompositeOperation(CompositeCopy);
paintInfo.context->fillRect(paintInfo.rect, baseColor);
paintInfo.context->setCompositeOperation(previousOperator);
} else {
paintInfo.context->clearRect(paintInfo.rect);
}
}
}
void ViewPainter::paintBoxDecorationBackground(const PaintInfo& paintInfo)
{
if (paintInfo.skipRootBackground())
return;
// This function overrides background painting for the LayoutView.
// View background painting is special in the following ways:
// 1. The view paints background for the root element, the background positioning respects
// the positioning and transformation of the root element.
// 2. CSS background-clip is ignored, the background layers always expand to cover the whole
// canvas. None of the stacking context effects (except transformation) on the root element
// affects the background.
// 3. The main frame is also responsible for painting the user-agent-defined base background
// color. Conceptually it should be painted by the embedder but painting it here allows
// culling and pre-blending optimization when possible.
GraphicsContext& context = paintInfo.context;
if (LayoutObjectDrawingRecorder::useCachedDrawingIfPossible(context, m_layoutView, DisplayItem::DocumentBackground, LayoutPoint()))
return;
// The background fill rect is the size of the LayoutView's main GraphicsLayer.
IntRect backgroundRect = pixelSnappedIntRect(m_layoutView.layer()->boundingBoxForCompositing());
const Document& document = m_layoutView.document();
const FrameView& frameView = *m_layoutView.frameView();
bool isMainFrame = !document.ownerElement();
bool paintsBaseBackground = isMainFrame && !frameView.isTransparent();
bool shouldClearCanvas = paintsBaseBackground && (document.settings() && document.settings()->shouldClearDocumentBackground());
Color baseBackgroundColor = paintsBaseBackground ? frameView.baseBackgroundColor() : Color();
Color rootBackgroundColor = m_layoutView.style()->visitedDependentColor(CSSPropertyBackgroundColor);
const LayoutObject* rootObject = document.documentElement() ? document.documentElement()->layoutObject() : nullptr;
LayoutObjectDrawingRecorder recorder(context, m_layoutView, DisplayItem::DocumentBackground, backgroundRect, LayoutPoint());
// Special handling for print economy mode.
bool forceBackgroundToWhite = BoxPainter::shouldForceWhiteBackgroundForPrintEconomy(m_layoutView.styleRef(), document);
if (forceBackgroundToWhite) {
// If for any reason the view background is not transparent, paint white instead, otherwise keep transparent as is.
if (paintsBaseBackground || rootBackgroundColor.alpha() || m_layoutView.style()->backgroundLayers().image())
context.fillRect(backgroundRect, Color::white, SkXfermode::kSrc_Mode);
return;
}
// Compute the enclosing rect of the view, in root element space.
//
// For background colors we can simply paint the document rect in the default space.
// However for background image, the root element transform applies. The strategy is to apply
// root element transform on the context and issue draw commands in the local space, therefore
// we need to apply inverse transform on the document rect to get to the root element space.
bool backgroundRenderable = true;
TransformationMatrix transform;
IntRect paintRect = backgroundRect;
if (!rootObject || !rootObject->isBox()) {
backgroundRenderable = false;
} else if (rootObject->hasLayer()) {
const PaintLayer& rootLayer = *toLayoutBoxModelObject(rootObject)->layer();
LayoutPoint offset;
rootLayer.convertToLayerCoords(nullptr, offset);
transform.translate(offset.x(), offset.y());
transform.multiply(rootLayer.renderableTransform(paintInfo.globalPaintFlags()));
if (!transform.isInvertible()) {
backgroundRenderable = false;
} else {
bool isClamped;
paintRect = transform.inverse().projectQuad(FloatQuad(backgroundRect), &isClamped).enclosingBoundingBox();
backgroundRenderable = !isClamped;
}
}
if (!backgroundRenderable) {
if (baseBackgroundColor.alpha())
context.fillRect(backgroundRect, baseBackgroundColor, shouldClearCanvas ? SkXfermode::kSrc_Mode : SkXfermode::kSrcOver_Mode);
else if (shouldClearCanvas)
context.fillRect(backgroundRect, Color(), SkXfermode::kClear_Mode);
return;
}
BoxPainter::FillLayerOcclusionOutputList reversedPaintList;
bool shouldDrawBackgroundInSeparateBuffer = BoxPainter(m_layoutView).calculateFillLayerOcclusionCulling(reversedPaintList, m_layoutView.style()->backgroundLayers());
ASSERT(reversedPaintList.size());
// If the root background color is opaque, isolation group can be skipped because the canvas
// will be cleared by root background color.
if (!rootBackgroundColor.hasAlpha())
shouldDrawBackgroundInSeparateBuffer = false;
// We are going to clear the canvas with transparent pixels, isolation group can be skipped.
if (!baseBackgroundColor.alpha() && shouldClearCanvas)
shouldDrawBackgroundInSeparateBuffer = false;
if (shouldDrawBackgroundInSeparateBuffer) {
if (baseBackgroundColor.alpha())
context.fillRect(backgroundRect, baseBackgroundColor, shouldClearCanvas ? SkXfermode::kSrc_Mode : SkXfermode::kSrcOver_Mode);
context.beginLayer();
}
Color combinedBackgroundColor = shouldDrawBackgroundInSeparateBuffer ? rootBackgroundColor : baseBackgroundColor.blend(rootBackgroundColor);
if (combinedBackgroundColor.alpha()) {
if (!combinedBackgroundColor.hasAlpha() && RuntimeEnabledFeatures::slimmingPaintV2Enabled())
recorder.setKnownToBeOpaque();
context.fillRect(backgroundRect, combinedBackgroundColor, (shouldDrawBackgroundInSeparateBuffer || shouldClearCanvas) ? SkXfermode::kSrc_Mode : SkXfermode::kSrcOver_Mode);
} else if (shouldClearCanvas && !shouldDrawBackgroundInSeparateBuffer) {
context.fillRect(backgroundRect, Color(), SkXfermode::kClear_Mode);
}
for (auto it = reversedPaintList.rbegin(); it != reversedPaintList.rend(); ++it) {
ASSERT((*it)->clip() == BorderFillBox);
bool shouldPaintInViewportSpace = (*it)->attachment() == FixedBackgroundAttachment;
if (shouldPaintInViewportSpace) {
BoxPainter::paintFillLayer(m_layoutView, paintInfo, Color(), **it, LayoutRect(LayoutRect::infiniteIntRect()), BackgroundBleedNone);
} else {
context.save();
// TODO(trchen): We should be able to handle 3D-transformed root
// background with slimming paint by using transform display items.
context.concatCTM(transform.toAffineTransform());
BoxPainter::paintFillLayer(m_layoutView, paintInfo, Color(), **it, LayoutRect(paintRect), BackgroundBleedNone);
context.restore();
}
}
if (shouldDrawBackgroundInSeparateBuffer)
context.endLayer();
}
void RenderView::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint&)
{
if (!paintInfo.shouldPaintWithinRoot(*this))
return;
// Check to see if we are enclosed by a layer that requires complex painting rules. If so, we cannot blit
// when scrolling, and we need to use slow repaints. Examples of layers that require this are transparent layers,
// layers with reflections, or transformed layers.
// FIXME: This needs to be dynamic. We should be able to go back to blitting if we ever stop being inside
// a transform, transparency layer, etc.
Element* elt;
for (elt = document().ownerElement(); elt && elt->renderer(); elt = elt->document().ownerElement()) {
RenderLayer* layer = elt->renderer()->enclosingLayer();
if (layer->cannotBlitToWindow()) {
frameView().setCannotBlitToWindow();
break;
}
#if USE(ACCELERATED_COMPOSITING)
if (RenderLayer* compositingLayer = layer->enclosingCompositingLayerForRepaint()) {
if (!compositingLayer->backing()->paintsIntoWindow()) {
frameView().setCannotBlitToWindow();
break;
}
}
#endif
}
if (document().ownerElement())
return;
if (paintInfo.skipRootBackground())
return;
bool rootFillsViewport = false;
bool rootObscuresBackground = false;
Element* documentElement = document().documentElement();
if (RenderElement* rootRenderer = documentElement ? documentElement->renderer() : 0) {
// The document element's renderer is currently forced to be a block, but may not always be.
RenderBox* rootBox = rootRenderer->isBox() ? toRenderBox(rootRenderer) : 0;
rootFillsViewport = rootBox && !rootBox->x() && !rootBox->y() && rootBox->width() >= width() && rootBox->height() >= height();
rootObscuresBackground = rendererObscuresBackground(rootRenderer);
}
Page* page = document().page();
float pageScaleFactor = page ? page->pageScaleFactor() : 1;
// If painting will entirely fill the view, no need to fill the background.
if (rootFillsViewport && rootObscuresBackground && pageScaleFactor >= 1)
return;
// This code typically only executes if the root element's visibility has been set to hidden,
// if there is a transform on the <html>, or if there is a page scale factor less than 1.
// Only fill with the base background color (typically white) if we're the root document,
// since iframes/frames with no background in the child document should show the parent's background.
if (frameView().isTransparent()) // FIXME: This needs to be dynamic. We should be able to go back to blitting if we ever stop being transparent.
frameView().setCannotBlitToWindow(); // The parent must show behind the child.
else {
Color baseColor = frameView().baseBackgroundColor();
if (baseColor.alpha()) {
CompositeOperator previousOperator = paintInfo.context->compositeOperation();
paintInfo.context->setCompositeOperation(CompositeCopy);
paintInfo.context->fillRect(paintInfo.rect, baseColor, style()->colorSpace());
paintInfo.context->setCompositeOperation(previousOperator);
} else
paintInfo.context->clearRect(paintInfo.rect);
}
}
