Add the ubercomp DelegatedRendererLayer.

cc/CCDelegatedRendererLayerImpl.cpp

Index: cc/CCDelegatedRendererLayerImpl.cpp
diff --git a/cc/CCDelegatedRendererLayerImpl.cpp b/cc/CCDelegatedRendererLayerImpl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..fafd3a8ec58e6ef461539d9a9742776f5c79746b
--- /dev/null
+++ b/cc/CCDelegatedRendererLayerImpl.cpp
@@ -0,0 +1,177 @@
+// Copyright 2012 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 "config.h"
+
+#include "CCDelegatedRendererLayerImpl.h"
+
+#include "CCAppendQuadsData.h"
+#include "CCQuadSink.h"
+#include "CCRenderPassDrawQuad.h"
+#include "CCRenderPassSink.h"
+
+namespace cc {
+
+CCDelegatedRendererLayerImpl::CCDelegatedRendererLayerImpl(int id)
+    : CCLayerImpl(id)
+{
+}
+
+CCDelegatedRendererLayerImpl::~CCDelegatedRendererLayerImpl()
+{
+    clearRenderPasses();
+}
+
+bool CCDelegatedRendererLayerImpl::descendantDrawsContent()
+{
+    // FIXME: This could possibly return false even though there are some
+    // quads present as they could all be from a single layer (or set of
+    // layers without children). If this happens, then make a test that
+    // ensures the opacity is being changed on quads in the root RenderPass
+    // when this layer doesn't own a RenderSurface.
+    return !m_renderPassesInDrawOrder.isEmpty();
+}
+
+bool CCDelegatedRendererLayerImpl::hasContributingDelegatedRenderPasses() const
+{
+    // The root RenderPass for the layer is merged with its target
+    // RenderPass in each frame. So we only have extra RenderPasses
+    // to merge when we have a non-root RenderPass present.
+    return m_renderPassesInDrawOrder.size() > 1;
+}
+
+void CCDelegatedRendererLayerImpl::setRenderPasses(OwnPtrVector<CCRenderPass>& renderPassesInDrawOrder)
+{
+    FloatRect oldRootDamage;
+    if (!m_renderPassesInDrawOrder.isEmpty())
+        oldRootDamage = m_renderPassesInDrawOrder.last()->damageRect();
+
+    clearRenderPasses();
+
+    for (size_t i = 0; i < renderPassesInDrawOrder.size(); ++i) {
+        m_renderPassesIndexById.set(renderPassesInDrawOrder[i]->id(), i);
+        m_renderPassesInDrawOrder.append(renderPassesInDrawOrder.take(i));
+    }
+    renderPassesInDrawOrder.clear();
+
+    if (!m_renderPassesInDrawOrder.isEmpty()) {
+        FloatRect newRootDamage = m_renderPassesInDrawOrder.last()->damageRect();
+        m_renderPassesInDrawOrder.last()->setDamageRect(unionRect(oldRootDamage, newRootDamage));
+    }
+}
+
+void CCDelegatedRendererLayerImpl::clearRenderPasses()
+{
+    // FIXME: Release the resources back to the nested compositor.
+    m_renderPassesIndexById.clear();
+    m_renderPassesInDrawOrder.clear();
+}
+
+void CCDelegatedRendererLayerImpl::didLoseContext()
+{
+    clearRenderPasses();
+}
+
+static inline int indexToId(int index) { return index + 1; }
+static inline int idToIndex(int id) { return id - 1; }
+
+CCRenderPass::Id CCDelegatedRendererLayerImpl::firstContributingRenderPassId() const
+{
+    return CCRenderPass::Id(id(), indexToId(0));
+}
+
+CCRenderPass::Id CCDelegatedRendererLayerImpl::nextContributingRenderPassId(CCRenderPass::Id previous) const
+{
+    return CCRenderPass::Id(previous.layerId, previous.index + 1);
+}
+
+CCRenderPass::Id CCDelegatedRendererLayerImpl::convertDelegatedRenderPassId(CCRenderPass::Id delegatedRenderPassId) const
+{
+    unsigned delegatedRenderPassIndex = m_renderPassesIndexById.get(delegatedRenderPassId);
+    return CCRenderPass::Id(id(), indexToId(delegatedRenderPassIndex));
+}
+
+void CCDelegatedRendererLayerImpl::appendContributingRenderPasses(CCRenderPassSink& renderPassSink)
+{
+    ASSERT(hasContributingDelegatedRenderPasses());
+
+    for (size_t i = 0; i < m_renderPassesInDrawOrder.size() - 1; ++i) {
+        CCRenderPass::Id outputRenderPassId = convertDelegatedRenderPassId(m_renderPassesInDrawOrder[i]->id());
+
+        // Don't clash with the RenderPass we generate if we own a RenderSurface.
+        ASSERT(outputRenderPassId.index > 0);
+
+        renderPassSink.appendRenderPass(m_renderPassesInDrawOrder[i]->copy(outputRenderPassId));
+    }
+}
+
+void CCDelegatedRendererLayerImpl::appendQuads(CCQuadSink& quadSink, CCAppendQuadsData& appendQuadsData)
+{
+    if (m_renderPassesInDrawOrder.isEmpty())
+        return;
+
+    CCRenderPass::Id targetRenderPassId = appendQuadsData.renderPassId;
+
+    // If the index of the renderPassId is 0, then it is a renderPass generated for a layer
+    // in this compositor, not the delegated renderer. Then we want to merge our root renderPass with
+    // the target renderPass. Otherwise, it is some renderPass which we added from the delegated
+    // renderer.
+    bool shouldMergeRootRenderPassWithTarget = !targetRenderPassId.index;
+    if (shouldMergeRootRenderPassWithTarget) {
+        // Verify that the renderPass we are appending to is created our renderTarget.
+        ASSERT(targetRenderPassId.layerId == renderTarget()->id());
+
+        CCRenderPass* rootDelegatedRenderPass = m_renderPassesInDrawOrder.last();
+        appendRenderPassQuads(quadSink, appendQuadsData, rootDelegatedRenderPass);
+    } else {
+        // Verify that the renderPass we are appending to was created by us.
+        ASSERT(targetRenderPassId.layerId == id());
+
+        int renderPassIndex = idToIndex(targetRenderPassId.index);
+        CCRenderPass* delegatedRenderPass = m_renderPassesInDrawOrder[renderPassIndex];
+        appendRenderPassQuads(quadSink, appendQuadsData, delegatedRenderPass);
+    }
+}
+
+void CCDelegatedRendererLayerImpl::appendRenderPassQuads(CCQuadSink& quadSink, CCAppendQuadsData& appendQuadsData, CCRenderPass* delegatedRenderPass) const
+{
+    const CCSharedQuadState* currentSharedQuadState = 0;
+    CCSharedQuadState* copiedSharedQuadState = 0;
+    for (size_t i = 0; i < delegatedRenderPass->quadList().size(); ++i) {
+        CCDrawQuad* quad = delegatedRenderPass->quadList()[i];
+
+        if (quad->sharedQuadState() != currentSharedQuadState) {
+            currentSharedQuadState = quad->sharedQuadState();
+            copiedSharedQuadState = quadSink.useSharedQuadState(currentSharedQuadState->copy());
+        }
+        ASSERT(copiedSharedQuadState);
+
+        bool targetIsFromDelegatedRendererLayer = appendQuadsData.renderPassId.layerId == id();
+        if (!targetIsFromDelegatedRendererLayer) {
+            // Should be the root render pass.
+            ASSERT(delegatedRenderPass == m_renderPassesInDrawOrder.last());
+            // This layer must be drawing to a renderTarget other than itself.
+            ASSERT(renderTarget() != this);
+
+            copiedSharedQuadState->quadTransform = copiedSharedQuadState->quadTransform * drawTransform();
+            copiedSharedQuadState->opacity *= drawOpacity();
+        }
+
+        OwnPtr<CCDrawQuad> copyQuad;
+        if (quad->material() != CCDrawQuad::RenderPass)
+            copyQuad = quad->copy(copiedSharedQuadState);
+        else {
+            CCRenderPass::Id contributingDelegatedRenderPassId = CCRenderPassDrawQuad::materialCast(quad)->renderPassId();
+            CCRenderPass::Id contributingRenderPassId = convertDelegatedRenderPassId(contributingDelegatedRenderPassId);
+            ASSERT(contributingRenderPassId != appendQuadsData.renderPassId);
+
+            copyQuad = CCRenderPassDrawQuad::materialCast(quad)->copy(copiedSharedQuadState, contributingRenderPassId);
+        }
+        ASSERT(copyQuad);
+
+        quadSink.append(copyQuad.release(), appendQuadsData);
+    }
+}
+
+}