cc/texture_layer_impl.cc

   1 // Copyright 2011 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 "cc/texture_layer_impl.h"
   6
   7 #include "base/stringprintf.h"
   8 #include "cc/quad_sink.h"
   9 #include "cc/renderer.h"
  10 #include "cc/texture_draw_quad.h"
  11
  12 namespace cc {
  13
  14 TextureLayerImpl::TextureLayerImpl(LayerTreeImpl* treeImpl, int id)
  15     : LayerImpl(treeImpl, id)
  16     , m_textureId(0)
  17     , m_externalTextureResource(0)
  18     , m_premultipliedAlpha(true)
  19     , m_flipped(true)
  20     , m_uvRect(0, 0, 1, 1)
  21 {
  22   m_vertexOpacity[0] = 1.0f;
  23   m_vertexOpacity[1] = 1.0f;
  24   m_vertexOpacity[2] = 1.0f;
  25   m_vertexOpacity[3] = 1.0f;
  26 }
  27
  28 TextureLayerImpl::~TextureLayerImpl()
  29 {
  30 }
  31
  32 void TextureLayerImpl::willDraw(ResourceProvider* resourceProvider)
  33 {
  34     if (!m_textureId)
  35         return;
  36     DCHECK(!m_externalTextureResource);
  37     m_externalTextureResource = resourceProvider->createResourceFromExternalTexture(m_textureId);
  38 }
  39
  40 void TextureLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQuadsData)
  41 {
  42     if (!m_externalTextureResource)
  43         return;
  44
  45     SharedQuadState* sharedQuadState = quadSink.useSharedQuadState(createSharedQuadState());
  46     appendDebugBorderQuad(quadSink, sharedQuadState, appendQuadsData);
  47
  48     gfx::Rect quadRect(gfx::Point(), contentBounds());
  49     gfx::Rect opaqueRect(contentsOpaque() ? quadRect : gfx::Rect());
  50     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
  51     quad->SetNew(sharedQuadState, quadRect, opaqueRect, m_externalTextureResource, m_premultipliedAlpha, m_uvRect, m_vertexOpacity, m_flipped);
  52
  53     // Perform explicit clipping on a quad to avoid setting a scissor later.
  54     if (sharedQuadState->is_clipped && quad->PerformClipping())
  55         sharedQuadState->is_clipped = false;
  56     if (!quad->rect.IsEmpty())
  57         quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
  58 }
  59
  60 void TextureLayerImpl::didDraw(ResourceProvider* resourceProvider)
  61 {
  62     if (!m_externalTextureResource)
  63         return;
  64     // FIXME: the following assert will not be true when sending resources to a
  65     // parent compositor. A synchronization scheme (double-buffering or
  66     // pipelining of updates) for the client will need to exist to solve this.
  67     DCHECK(!resourceProvider->inUseByConsumer(m_externalTextureResource));
  68     resourceProvider->deleteResource(m_externalTextureResource);
  69     m_externalTextureResource = 0;
  70 }
  71
  72 void TextureLayerImpl::dumpLayerProperties(std::string* str, int indent) const
  73 {
  74     str->append(indentString(indent));
  75     base::StringAppendF(str, "texture layer texture id: %u premultiplied: %d\n", m_textureId, m_premultipliedAlpha);
  76     LayerImpl::dumpLayerProperties(str, indent);
  77 }
  78
  79 void TextureLayerImpl::setVertexOpacity(const float vertexOpacity[4]) {
  80     m_vertexOpacity[0] = vertexOpacity[0];
  81     m_vertexOpacity[1] = vertexOpacity[1];
  82     m_vertexOpacity[2] = vertexOpacity[2];
  83     m_vertexOpacity[3] = vertexOpacity[3];
  84 }
  85
  86 void TextureLayerImpl::didLoseOutputSurface()
  87 {
  88     m_textureId = 0;
  89     m_externalTextureResource = 0;
  90 }
  91
  92 const char* TextureLayerImpl::layerTypeAsString() const
  93 {
  94     return "TextureLayer";
  95 }
  96
  97 }  // namespace cc