Adding support for per vertex opacity on textured layer

cc/texture_layer_impl.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/texture_layer_impl.h"
 
 #include "base/stringprintf.h"
 #include "cc/quad_sink.h"
 #include "cc/renderer.h"
 #include "cc/texture_draw_quad.h"
 
 namespace cc {
 
 TextureLayerImpl::TextureLayerImpl(LayerTreeImpl* treeImpl, int id)
     : LayerImpl(treeImpl, id)
     , m_textureId(0)
     , m_externalTextureResource(0)
     , m_premultipliedAlpha(true)
     , m_flipped(true)
     , m_uvRect(0, 0, 1, 1)
 {
+  m_vertexOpacity[0] = 1.0f;
+  m_vertexOpacity[1] = 1.0f;
+  m_vertexOpacity[2] = 1.0f;
+  m_vertexOpacity[3] = 1.0f;
 }
 
 TextureLayerImpl::~TextureLayerImpl()
 {
 }
 
 void TextureLayerImpl::willDraw(ResourceProvider* resourceProvider)
 {
     if (!m_textureId)
         return;
     DCHECK(!m_externalTextureResource);
     m_externalTextureResource = resourceProvider->createResourceFromExternalTexture(m_textureId);
 }
 
 void TextureLayerImpl::appendQuads(QuadSink& quadSink, AppendQuadsData& appendQuadsData)
 {
     if (!m_externalTextureResource)
         return;
 
     SharedQuadState* sharedQuadState = quadSink.useSharedQuadState(createSharedQuadState());
     appendDebugBorderQuad(quadSink, sharedQuadState, appendQuadsData);
 
     gfx::Rect quadRect(gfx::Point(), contentBounds());
     gfx::Rect opaqueRect(contentsOpaque() ? quadRect : gfx::Rect());
     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
-    quad->SetNew(sharedQuadState, quadRect, opaqueRect, m_externalTextureResource, m_premultipliedAlpha, m_uvRect, m_flipped);
+    quad->SetNew(sharedQuadState, quadRect, opaqueRect, m_externalTextureResource, m_premultipliedAlpha, m_uvRect, m_vertexOpacity, m_flipped);
 
     // Perform explicit clipping on a quad to avoid setting a scissor later.
     if (sharedQuadState->is_clipped && quad->PerformClipping())
         sharedQuadState->is_clipped = false;
     if (!quad->rect.IsEmpty())
         quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
 }
 
 void TextureLayerImpl::didDraw(ResourceProvider* resourceProvider)
 {
     if (!m_externalTextureResource)
         return;
     // FIXME: the following assert will not be true when sending resources to a
     // parent compositor. A synchronization scheme (double-buffering or
     // pipelining of updates) for the client will need to exist to solve this.
     DCHECK(!resourceProvider->inUseByConsumer(m_externalTextureResource));
     resourceProvider->deleteResource(m_externalTextureResource);
     m_externalTextureResource = 0;
 }
 
 void TextureLayerImpl::dumpLayerProperties(std::string* str, int indent) const
 {
     str->append(indentString(indent));
     base::StringAppendF(str, "texture layer texture id: %u premultiplied: %d\n", m_textureId, m_premultipliedAlpha);
     LayerImpl::dumpLayerProperties(str, indent);
 }
 
+void TextureLayerImpl::setVertexOpacity(const float vertexOpacity[4]) {
+    m_vertexOpacity[0] = vertexOpacity[0];
+    m_vertexOpacity[1] = vertexOpacity[1];
+    m_vertexOpacity[2] = vertexOpacity[2];
+    m_vertexOpacity[3] = vertexOpacity[3];
+}
+
 void TextureLayerImpl::didLoseOutputSurface()
 {
     m_textureId = 0;
     m_externalTextureResource = 0;
 }
 
 const char* TextureLayerImpl::layerTypeAsString() const
 {
     return "TextureLayer";
 }
 
 }  // namespace cc