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 "PageOverlay.h" 31 32#include "WebPageOverlay.h" 33#include "WebViewClient.h" 34#include "WebViewImpl.h" 35#include "core/page/Page.h" 36#include "core/frame/Settings.h" 37#include "platform/graphics/GraphicsLayer.h" 38#include "platform/graphics/GraphicsLayerClient.h" 39#include "public/platform/WebLayer.h" 40 41using namespace WebCore; 42 43namespace blink { 44 45namespace { 46 47WebCanvas* ToWebCanvas(GraphicsContext* gc) 48{ 49 return gc->canvas(); 50} 51 52} // namespace 53 54PassOwnPtr<PageOverlay> PageOverlay::create(WebViewImpl* viewImpl, WebPageOverlay* overlay) 55{ 56 return adoptPtr(new PageOverlay(viewImpl, overlay)); 57} 58 59PageOverlay::PageOverlay(WebViewImpl* viewImpl, WebPageOverlay* overlay) 60 : m_viewImpl(viewImpl) 61 , m_overlay(overlay) 62 , m_zOrder(0) 63{ 64} 65 66class OverlayGraphicsLayerClientImpl : public WebCore::GraphicsLayerClient { 67public: 68 static PassOwnPtr<OverlayGraphicsLayerClientImpl> create(WebPageOverlay* overlay) 69 { 70 return adoptPtr(new OverlayGraphicsLayerClientImpl(overlay)); 71 } 72 73 virtual ~OverlayGraphicsLayerClientImpl() { } 74 75 virtual void notifyAnimationStarted(const GraphicsLayer*, double wallClockTime, double monotonicTime) OVERRIDE { } 76 77 virtual void paintContents(const GraphicsLayer*, GraphicsContext& gc, GraphicsLayerPaintingPhase, const IntRect& inClip) 78 { 79 gc.save(); 80 m_overlay->paintPageOverlay(ToWebCanvas(&gc)); 81 gc.restore(); 82 } 83 84 virtual String debugName(const GraphicsLayer* graphicsLayer) OVERRIDE 85 { 86 return String("WebViewImpl Page Overlay Content Layer"); 87 } 88 89private: 90 explicit OverlayGraphicsLayerClientImpl(WebPageOverlay* overlay) 91 : m_overlay(overlay) 92 { 93 } 94 95 WebPageOverlay* m_overlay; 96}; 97 98void PageOverlay::clear() 99{ 100 invalidateWebFrame(); 101 102 if (m_layer) { 103 m_layer->removeFromParent(); 104 m_layer = nullptr; 105 m_layerClient = nullptr; 106 } 107} 108 109void PageOverlay::update() 110{ 111 invalidateWebFrame(); 112 113 if (!m_layer) { 114 m_layerClient = OverlayGraphicsLayerClientImpl::create(m_overlay); 115 m_layer = GraphicsLayer::create(m_viewImpl->graphicsLayerFactory(), m_layerClient.get()); 116 m_layer->setDrawsContent(true); 117 118 // Compositor hit-testing does not know how to deal with layers that may be 119 // transparent to events (see http://crbug.com/269598). So require 120 // scrolling and touches on this layer to go to the main thread. 121 WebLayer* platformLayer = m_layer->platformLayer(); 122 platformLayer->setShouldScrollOnMainThread(true); 123 WebVector<WebRect> webRects(static_cast<size_t>(1)); 124 webRects[0] = WebRect(0, 0, INT_MAX, INT_MAX); 125 platformLayer->setTouchEventHandlerRegion(webRects); 126 } 127 128 FloatSize size(m_viewImpl->size()); 129 if (size != m_layer->size()) { 130 // Triggers re-adding to root layer to ensure that we are on top of 131 // scrollbars. 132 m_layer->removeFromParent(); 133 m_layer->setSize(size); 134 } 135 136 m_viewImpl->setOverlayLayer(m_layer.get()); 137 m_layer->setNeedsDisplay(); 138} 139 140void PageOverlay::paintWebFrame(GraphicsContext& gc) 141{ 142 if (!m_viewImpl->isAcceleratedCompositingActive()) { 143 gc.save(); 144 m_overlay->paintPageOverlay(ToWebCanvas(&gc)); 145 gc.restore(); 146 } 147} 148 149void PageOverlay::invalidateWebFrame() 150{ 151 // WebPageOverlay does the actual painting of the overlay. 152 // Here we just make sure to invalidate. 153 if (!m_viewImpl->isAcceleratedCompositingActive()) { 154 // FIXME: able to invalidate a smaller rect. 155 // FIXME: Is it important to just invalidate a smaller rect given that 156 // this is not on a critical codepath? In order to do so, we'd 157 // have to take scrolling into account. 158 const WebSize& size = m_viewImpl->size(); 159 WebRect damagedRect(0, 0, size.width, size.height); 160 if (m_viewImpl->client()) 161 m_viewImpl->client()->didInvalidateRect(damagedRect); 162 } 163} 164 165} // namespace blink 166