1/* 2 * Copyright (C) 2011 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following disclaimer 13 * in the documentation and/or other materials provided with the 14 * distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. AND ITS CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GOOGLE INC. 20 * OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include "config.h" 30#include "web/PageOverlay.h" 31 32#include "core/frame/Settings.h" 33#include "core/page/Page.h" 34#include "platform/graphics/GraphicsContext.h" 35#include "platform/graphics/GraphicsLayer.h" 36#include "platform/graphics/GraphicsLayerClient.h" 37#include "public/platform/WebLayer.h" 38#include "public/web/WebPageOverlay.h" 39#include "public/web/WebViewClient.h" 40#include "web/WebViewImpl.h" 41 42using namespace WebCore; 43 44namespace blink { 45 46namespace { 47 48WebCanvas* ToWebCanvas(GraphicsContext* gc) 49{ 50 return gc->canvas(); 51} 52 53} // namespace 54 55PassOwnPtr<PageOverlay> PageOverlay::create(WebViewImpl* viewImpl, WebPageOverlay* overlay) 56{ 57 return adoptPtr(new PageOverlay(viewImpl, overlay)); 58} 59 60PageOverlay::PageOverlay(WebViewImpl* viewImpl, WebPageOverlay* overlay) 61 : m_viewImpl(viewImpl) 62 , m_overlay(overlay) 63 , m_zOrder(0) 64{ 65} 66 67class OverlayGraphicsLayerClientImpl : public WebCore::GraphicsLayerClient { 68public: 69 static PassOwnPtr<OverlayGraphicsLayerClientImpl> create(WebPageOverlay* overlay) 70 { 71 return adoptPtr(new OverlayGraphicsLayerClientImpl(overlay)); 72 } 73 74 virtual ~OverlayGraphicsLayerClientImpl() { } 75 76 virtual void notifyAnimationStarted(const GraphicsLayer*, double monotonicTime) OVERRIDE { } 77 78 virtual void paintContents(const GraphicsLayer*, GraphicsContext& gc, GraphicsLayerPaintingPhase, const IntRect& inClip) 79 { 80 if (gc.paintingDisabled()) 81 return; 82 gc.save(); 83 m_overlay->paintPageOverlay(ToWebCanvas(&gc)); 84 gc.restore(); 85 } 86 87 virtual String debugName(const GraphicsLayer* graphicsLayer) OVERRIDE 88 { 89 return String("WebViewImpl Page Overlay Content Layer"); 90 } 91 92private: 93 explicit OverlayGraphicsLayerClientImpl(WebPageOverlay* overlay) 94 : m_overlay(overlay) 95 { 96 } 97 98 WebPageOverlay* m_overlay; 99}; 100 101void PageOverlay::clear() 102{ 103 invalidateWebFrame(); 104 105 if (m_layer) { 106 m_layer->removeFromParent(); 107 if (WebCore::Page* page = m_viewImpl->page()) 108 page->inspectorController().didRemovePageOverlay(m_layer.get()); 109 m_layer = nullptr; 110 m_layerClient = nullptr; 111 } 112} 113 114void PageOverlay::update() 115{ 116 invalidateWebFrame(); 117 118 if (!m_layer) { 119 m_layerClient = OverlayGraphicsLayerClientImpl::create(m_overlay); 120 m_layer = GraphicsLayer::create(m_viewImpl->graphicsLayerFactory(), m_layerClient.get()); 121 m_layer->setDrawsContent(true); 122 123 if (WebCore::Page* page = m_viewImpl->page()) 124 page->inspectorController().willAddPageOverlay(m_layer.get()); 125 126 // This is required for contents of overlay to stay in sync with the page while scrolling. 127 WebLayer* platformLayer = m_layer->platformLayer(); 128 platformLayer->setShouldScrollOnMainThread(true); 129 } 130 131 FloatSize size(m_viewImpl->size()); 132 if (size != m_layer->size()) { 133 // Triggers re-adding to root layer to ensure that we are on top of 134 // scrollbars. 135 m_layer->removeFromParent(); 136 m_layer->setSize(size); 137 } 138 139 m_viewImpl->setOverlayLayer(m_layer.get()); 140 m_layer->setNeedsDisplay(); 141} 142 143void PageOverlay::paintWebFrame(GraphicsContext& gc) 144{ 145 if (!m_viewImpl->isAcceleratedCompositingActive() && !gc.paintingDisabled()) { 146 gc.save(); 147 m_overlay->paintPageOverlay(ToWebCanvas(&gc)); 148 gc.restore(); 149 } 150} 151 152void PageOverlay::invalidateWebFrame() 153{ 154 // WebPageOverlay does the actual painting of the overlay. 155 // Here we just make sure to invalidate. 156 if (!m_viewImpl->isAcceleratedCompositingActive()) { 157 // FIXME: able to invalidate a smaller rect. 158 // FIXME: Is it important to just invalidate a smaller rect given that 159 // this is not on a critical codepath? In order to do so, we'd 160 // have to take scrolling into account. 161 const WebSize& size = m_viewImpl->size(); 162 WebRect damagedRect(0, 0, size.width, size.height); 163 if (m_viewImpl->client()) 164 m_viewImpl->client()->didInvalidateRect(damagedRect); 165 } 166} 167 168} // namespace blink 169