Source/WebCore/platform/graphics/chromium/RenderSurfaceChromium.cpp

   1 /*
   2  * Copyright (C) 2010 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
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27
  28 #if USE(ACCELERATED_COMPOSITING)
  29
  30 #include "RenderSurfaceChromium.h"
  31
  32 #include "cc/CCLayerImpl.h"
  33 #include "GraphicsContext3D.h"
  34 #include "LayerChromium.h"
  35 #include "LayerRendererChromium.h"
  36 #include "LayerTexture.h"
  37 #include "TextStream.h"
  38 #include <wtf/text/CString.h>
  39
  40 namespace WebCore {
  41
  42 RenderSurfaceChromium::RenderSurfaceChromium(CCLayerImpl* owningLayer)
  43     : m_owningLayer(owningLayer)
  44     , m_maskLayer(0)
  45     , m_skipsDraw(false)
  46 {
  47 }
  48
  49 RenderSurfaceChromium::~RenderSurfaceChromium()
  50 {
  51     cleanupResources();
  52 }
  53
  54 void RenderSurfaceChromium::cleanupResources()
  55 {
  56     if (!m_contentsTexture)
  57         return;
  58
  59     ASSERT(layerRenderer());
  60
  61     m_contentsTexture.clear();
  62 }
  63
  64 LayerRendererChromium* RenderSurfaceChromium::layerRenderer()
  65 {
  66     ASSERT(m_owningLayer);
  67     return m_owningLayer->layerRenderer();
  68 }
  69
  70 FloatRect RenderSurfaceChromium::drawableContentRect() const
  71 {
  72     FloatRect localContentRect(-0.5 * m_contentRect.width(), -0.5 * m_contentRect.height(),
  73                                m_contentRect.width(), m_contentRect.height());
  74     FloatRect drawableContentRect = m_drawTransform.mapRect(localContentRect);
  75     if (m_owningLayer->replicaLayer())
  76         drawableContentRect.unite(m_replicaDrawTransform.mapRect(localContentRect));
  77
  78     return drawableContentRect;
  79 }
  80
  81 bool RenderSurfaceChromium::prepareContentsTexture()
  82 {
  83     IntSize requiredSize(m_contentRect.size());
  84     TextureManager* textureManager = layerRenderer()->textureManager();
  85
  86     if (!m_contentsTexture)
  87         m_contentsTexture = LayerTexture::create(layerRenderer()->context(), textureManager);
  88
  89     if (m_contentsTexture->isReserved())
  90         return true;
  91
  92     if (!m_contentsTexture->reserve(requiredSize, GraphicsContext3D::RGBA)) {
  93         m_skipsDraw = true;
  94         return false;
  95     }
  96
  97     m_skipsDraw = false;
  98     return true;
  99 }
 100
 101 void RenderSurfaceChromium::drawSurface(CCLayerImpl* maskLayer, const TransformationMatrix& drawTransform)
 102 {
 103     GraphicsContext3D* context3D = layerRenderer()->context();
 104
 105     int shaderMatrixLocation = -1;
 106     int shaderAlphaLocation = -1;
 107     const RenderSurfaceChromium::Program* program = layerRenderer()->renderSurfaceProgram();
 108     const RenderSurfaceChromium::MaskProgram* maskProgram = layerRenderer()->renderSurfaceMaskProgram();
 109     ASSERT(program && program->initialized());
 110     bool useMask = false;
 111     if (maskLayer && maskLayer->drawsContent()) {
 112         if (!maskLayer->bounds().isEmpty()) {
 113             context3D->makeContextCurrent();
 114             layerRenderer()->useShader(maskProgram->program());
 115             GLC(context3D, context3D->activeTexture(GraphicsContext3D::TEXTURE0));
 116             GLC(context3D, context3D->uniform1i(maskProgram->fragmentShader().samplerLocation(), 0));
 117             m_contentsTexture->bindTexture();
 118             GLC(context3D, context3D->activeTexture(GraphicsContext3D::TEXTURE1));
 119             GLC(context3D, context3D->uniform1i(maskProgram->fragmentShader().maskSamplerLocation(), 1));
 120             maskLayer->bindContentsTexture();
 121             GLC(context3D, context3D->activeTexture(GraphicsContext3D::TEXTURE0));
 122             shaderMatrixLocation = maskProgram->vertexShader().matrixLocation();
 123             shaderAlphaLocation = maskProgram->fragmentShader().alphaLocation();
 124             useMask = true;
 125         }
 126     }
 127
 128     if (!useMask) {
 129         layerRenderer()->useShader(program->program());
 130         m_contentsTexture->bindTexture();
 131         GLC(context3D, context3D->uniform1i(program->fragmentShader().samplerLocation(), 0));
 132         shaderMatrixLocation = program->vertexShader().matrixLocation();
 133         shaderAlphaLocation = program->fragmentShader().alphaLocation();
 134     }
 135
 136     LayerChromium::drawTexturedQuad(layerRenderer()->context(), layerRenderer()->projectionMatrix(), drawTransform,
 137                                         m_contentRect.width(), m_contentRect.height(), m_drawOpacity,
 138                                         shaderMatrixLocation, shaderAlphaLocation);
 139
 140     m_contentsTexture->unreserve();
 141
 142     if (maskLayer)
 143         maskLayer->unreserveContentsTexture();
 144 }
 145
 146 void RenderSurfaceChromium::draw(const IntRect&)
 147 {
 148     if (m_skipsDraw || !m_contentsTexture)
 149         return;
 150     // FIXME: By using the same RenderSurface for both the content and its reflection,
 151     // it's currently not possible to apply a separate mask to the reflection layer
 152     // or correctly handle opacity in reflections (opacity must be applied after drawing
 153     // both the layer and its reflection). The solution is to introduce yet another RenderSurface
 154     // to draw the layer and its reflection in. For now we only apply a separate reflection
 155     // mask if the contents don't have a mask of their own.
 156     CCLayerImpl* replicaMaskLayer = m_maskLayer;
 157     if (!m_maskLayer && m_owningLayer->replicaLayer())
 158         replicaMaskLayer = m_owningLayer->replicaLayer()->maskLayer();
 159
 160     layerRenderer()->setScissorToRect(m_scissorRect);
 161
 162     // Reflection draws before the layer.
 163     if (m_owningLayer->replicaLayer())
 164         drawSurface(replicaMaskLayer, m_replicaDrawTransform);
 165
 166     drawSurface(m_maskLayer, m_drawTransform);
 167 }
 168
 169 String RenderSurfaceChromium::name() const
 170 {
 171 #ifndef NDEBUG
 172     return String::format("RenderSurface(id=%i,owner=%s)", m_owningLayer->debugID(), m_owningLayer->name().utf8().data());
 173 #else
 174     return String::format("RenderSurface(owner=%s)", m_owningLayer->name().utf8().data());
 175 #endif
 176 }
 177
 178 static void writeIndent(TextStream& ts, int indent)
 179 {
 180     for (int i = 0; i != indent; ++i)
 181         ts << "  ";
 182 }
 183
 184 void RenderSurfaceChromium::dumpSurface(TextStream& ts, int indent) const
 185 {
 186     writeIndent(ts, indent);
 187     ts << name() << "\n";
 188
 189     writeIndent(ts, indent+1);
 190     ts << "contentRect: (" << m_contentRect.x() << ", " << m_contentRect.y() << ", " << m_contentRect.width() << ", " << m_contentRect.height() << "\n";
 191 }
 192
 193 }
 194 #endif // USE(ACCELERATED_COMPOSITING)