| // 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/ViewPainter.h" |
| |
| #include "core/frame/FrameView.h" |
| #include "core/paint/BlockPainter.h" |
| #include "core/rendering/GraphicsContextAnnotator.h" |
| #include "core/rendering/PaintInfo.h" |
| #include "core/rendering/RenderBox.h" |
| #include "core/rendering/RenderView.h" |
| |
| namespace blink { |
| |
| void ViewPainter::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset) |
| { |
| // If we ever require layout but receive a paint anyway, something has gone horribly wrong. |
| ASSERT(!m_renderView.needsLayout()); |
| // RenderViews should never be called to paint with an offset not on device pixels. |
| ASSERT(LayoutPoint(IntPoint(paintOffset.x(), paintOffset.y())) == paintOffset); |
| |
| ANNOTATE_GRAPHICS_CONTEXT(paintInfo, &m_renderView); |
| |
| // This avoids painting garbage between columns if there is a column gap. |
| if (m_renderView.frameView() && m_renderView.style()->isOverflowPaged()) |
| paintInfo.context->fillRect(paintInfo.rect, m_renderView.frameView()->baseBackgroundColor()); |
| |
| m_renderView.paintObject(paintInfo, paintOffset); |
| BlockPainter(m_renderView).paintOverflowControlsIfNeeded(paintInfo, paintOffset); |
| } |
| |
| static inline bool rendererObscuresBackground(RenderBox* rootBox) |
| { |
| ASSERT(rootBox); |
| RenderStyle* style = rootBox->style(); |
| if (style->visibility() != VISIBLE |
| || style->opacity() != 1 |
| || style->hasFilter() |
| || style->hasTransform()) |
| return false; |
| |
| if (rootBox->compositingState() == PaintsIntoOwnBacking) |
| return false; |
| |
| const RenderObject* rootRenderer = rootBox->rendererForRootBackground(); |
| if (rootRenderer->style()->backgroundClip() == TextFillBox) |
| return false; |
| |
| return true; |
| } |
| |
| 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); |
| } |
| } |
| } |
| |
| bool ViewPainter::rootFillsViewportBackground(RenderBox* rootBox) const |
| { |
| ASSERT(rootBox); |
| // CSS Boxes always fill the viewport background (see paintRootBoxFillLayers) |
| if (!rootBox->isSVG()) |
| return true; |
| |
| return rootBox->frameRect().contains(m_renderView.frameRect()); |
| } |
| |
| } // namespace blink |
