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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "config.h" |
| 6 #include "core/paint/ViewPainter.h" |
| 7 |
| 8 #include "core/frame/FrameView.h" |
| 9 #include "core/rendering/GraphicsContextAnnotator.h" |
| 10 #include "core/rendering/PaintInfo.h" |
| 11 #include "core/rendering/RenderBox.h" |
| 12 #include "core/rendering/RenderView.h" |
| 13 |
| 14 namespace blink { |
| 15 |
| 16 void ViewPainter::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset) |
| 17 { |
| 18 // If we ever require layout but receive a paint anyway, something has gone
horribly wrong. |
| 19 ASSERT(!m_renderView.needsLayout()); |
| 20 // RenderViews should never be called to paint with an offset not on device
pixels. |
| 21 ASSERT(LayoutPoint(IntPoint(paintOffset.x(), paintOffset.y())) == paintOffse
t); |
| 22 |
| 23 ANNOTATE_GRAPHICS_CONTEXT(paintInfo, &m_renderView); |
| 24 |
| 25 // This avoids painting garbage between columns if there is a column gap. |
| 26 if (m_renderView.frameView() && m_renderView.style()->isOverflowPaged()) |
| 27 paintInfo.context->fillRect(paintInfo.rect, m_renderView.frameView()->ba
seBackgroundColor()); |
| 28 |
| 29 m_renderView.paintObject(paintInfo, paintOffset); |
| 30 } |
| 31 |
| 32 static inline bool rendererObscuresBackground(RenderBox* rootBox) |
| 33 { |
| 34 ASSERT(rootBox); |
| 35 RenderStyle* style = rootBox->style(); |
| 36 if (style->visibility() != VISIBLE |
| 37 || style->opacity() != 1 |
| 38 || style->hasFilter() |
| 39 || style->hasTransform()) |
| 40 return false; |
| 41 |
| 42 if (rootBox->compositingState() == PaintsIntoOwnBacking) |
| 43 return false; |
| 44 |
| 45 const RenderObject* rootRenderer = rootBox->rendererForRootBackground(); |
| 46 if (rootRenderer->style()->backgroundClip() == TextFillBox) |
| 47 return false; |
| 48 |
| 49 return true; |
| 50 } |
| 51 |
| 52 void ViewPainter::paintBoxDecorationBackground(PaintInfo& paintInfo) |
| 53 { |
| 54 if (m_renderView.document().ownerElement() || !m_renderView.view()) |
| 55 return; |
| 56 |
| 57 if (paintInfo.skipRootBackground()) |
| 58 return; |
| 59 |
| 60 bool shouldPaintBackground = true; |
| 61 Node* documentElement = m_renderView.document().documentElement(); |
| 62 if (RenderBox* rootBox = documentElement ? toRenderBox(documentElement->rend
erer()) : 0) |
| 63 shouldPaintBackground = !rootFillsViewportBackground(rootBox) || !render
erObscuresBackground(rootBox); |
| 64 |
| 65 // If painting will entirely fill the view, no need to fill the background. |
| 66 if (!shouldPaintBackground) |
| 67 return; |
| 68 |
| 69 // This code typically only executes if the root element's visibility has be
en set to hidden, |
| 70 // if there is a transform on the <html>, or if there is a page scale factor
less than 1. |
| 71 // Only fill with the base background color (typically white) if we're the r
oot document, |
| 72 // since iframes/frames with no background in the child document should show
the parent's background. |
| 73 if (!m_renderView.frameView()->isTransparent()) { |
| 74 Color baseColor = m_renderView.frameView()->baseBackgroundColor(); |
| 75 if (baseColor.alpha()) { |
| 76 CompositeOperator previousOperator = paintInfo.context->compositeOpe
ration(); |
| 77 paintInfo.context->setCompositeOperation(CompositeCopy); |
| 78 paintInfo.context->fillRect(paintInfo.rect, baseColor); |
| 79 paintInfo.context->setCompositeOperation(previousOperator); |
| 80 } else { |
| 81 paintInfo.context->clearRect(paintInfo.rect); |
| 82 } |
| 83 } |
| 84 } |
| 85 |
| 86 bool ViewPainter::rootFillsViewportBackground(RenderBox* rootBox) const |
| 87 { |
| 88 ASSERT(rootBox); |
| 89 // CSS Boxes always fill the viewport background (see paintRootBoxFillLayers
) |
| 90 if (!rootBox->isSVG()) |
| 91 return true; |
| 92 |
| 93 return rootBox->frameRect().contains(m_renderView.frameRect()); |
| 94 } |
| 95 |
| 96 } // namespace blink |
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