compositor-worker: blink->cc plumbing

third_party/WebKit/Source/core/dom/CompositorProxy.cpp

 // Copyright 2015 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 "core/dom/CompositorProxy.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/CompositorProxyClient.h"
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
+#include "core/workers/WorkerClients.h"
+#include "core/workers/WorkerGlobalScope.h"
 #include "platform/ThreadSafeFunctional.h"
 #include "platform/graphics/CompositorMutableProperties.h"
+#include "platform/graphics/CompositorMutableState.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebTraceLocation.h"
 #include <algorithm>
 
 namespace blink {
 
+// When adding to this list, make sure to update
+// LayoutTests/virtual/threaded/fast/compositorworker/compositor-proxy-supports.html.
+
 static const struct {
     const char* name;
     uint32_t property;
 } allowedProperties[] = {
     { "opacity", CompositorMutableProperty::kOpacity },
     { "scrollleft", CompositorMutableProperty::kScrollLeft },
     { "scrolltop", CompositorMutableProperty::kScrollTop },
     { "transform", CompositorMutableProperty::kTransform },
 };
 
@@ skipping 75 matching lines @@
 {
     if (!context->isDocument()) {
         exceptionState.throwTypeError(ExceptionMessages::failedToConstruct("CompositorProxy", "Can only be created from the main context."));
         exceptionState.throwIfNeeded();
         return nullptr;
     }
 
     return new CompositorProxy(*element, attributeArray);
 }
 
-CompositorProxy* CompositorProxy::create(uint64_t elementId, uint32_t compositorMutableProperties)
+CompositorProxy* CompositorProxy::create(ExecutionContext* context, uint64_t elementId, uint32_t compositorMutableProperties)
 {
-    return new CompositorProxy(elementId, compositorMutableProperties);
+    WorkerClients* clients = toWorkerGlobalScope(context)->clients();
+    ASSERT(clients);
+    CompositorProxyClient* client = CompositorProxyClient::from(clients);
+    return new CompositorProxy(elementId, compositorMutableProperties, client);
 }
 
 CompositorProxy::CompositorProxy(Element& element, const Vector<String>& attributeArray)
     : m_elementId(DOMNodeIds::idForNode(&element))
     , m_compositorMutableProperties(compositorMutablePropertiesFromNames(attributeArray))
+    , m_client(nullptr)
 {
     ASSERT(isMainThread());
     ASSERT(m_compositorMutableProperties);
     ASSERT(sanityCheckMutableProperties(m_compositorMutableProperties));
 
     incrementCompositorProxiedPropertiesForElement(m_elementId, m_compositorMutableProperties);
 }
 
-CompositorProxy::CompositorProxy(uint64_t elementId, uint32_t compositorMutableProperties)
+CompositorProxy::CompositorProxy(uint64_t elementId, uint32_t compositorMutableProperties, CompositorProxyClient* client)
     : m_elementId(elementId)
     , m_compositorMutableProperties(compositorMutableProperties)
+    , m_client(client)
 {
     ASSERT(isControlThread());
     ASSERT(sanityCheckMutableProperties(m_compositorMutableProperties));
     Platform::current()->mainThread()->taskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&incrementCompositorProxiedPropertiesForElement, m_elementId, m_compositorMutableProperties));
+    m_client->registerCompositorProxy(this);
 }
 
 CompositorProxy::~CompositorProxy()
 {
     if (m_connected)
         disconnect();
 }
 
 bool CompositorProxy::supports(const String& attributeName) const
 {
     return m_compositorMutableProperties & compositorMutablePropertyForName(attributeName);
 }
 
 double CompositorProxy::opacity(ExceptionState& exceptionState) const
 {
-    if (raiseExceptionIfMutationNotAllowed(exceptionState))
-        return 0.0;
-    if (raiseExceptionIfNotMutable(CompositorMutableProperty::kOpacity, exceptionState))
-        return 0.0;
-    return m_opacity;
+    double value = 0.0;
+    if (!raiseExceptionIfMutationNotAllowed(exceptionState)
+        && !raiseExceptionIfNotMutable(CompositorMutableProperty::kOpacity, exceptionState)
+        && m_state.get()) {
+        value = m_state->opacity();
+    }
+    return value;
 }
 
 double CompositorProxy::scrollLeft(ExceptionState& exceptionState) const
 {
-    if (raiseExceptionIfMutationNotAllowed(exceptionState))
-        return 0.0;
-    if (raiseExceptionIfNotMutable(CompositorMutableProperty::kScrollLeft, exceptionState))
-        return 0.0;
-    return m_scrollLeft;
+    double value = 0.0;
+    if (!raiseExceptionIfMutationNotAllowed(exceptionState)
+        && !raiseExceptionIfNotMutable(CompositorMutableProperty::kScrollLeft, exceptionState)
+        && m_state.get()) {
+        value = m_state->scrollLeft();
+    }
+    return value;
 }
 
 double CompositorProxy::scrollTop(ExceptionState& exceptionState) const
 {
-    if (raiseExceptionIfMutationNotAllowed(exceptionState))
-        return 0.0;
-    if (raiseExceptionIfNotMutable(CompositorMutableProperty::kScrollTop, exceptionState))
-        return 0.0;
-    return m_scrollTop;
+    double value = 0.0;
+    if (!raiseExceptionIfMutationNotAllowed(exceptionState)
+        && !raiseExceptionIfNotMutable(CompositorMutableProperty::kScrollTop, exceptionState)
+        && m_state.get()) {
+        value = m_state->scrollTop();
+    }
+    return value;
 }
 
 DOMMatrix* CompositorProxy::transform(ExceptionState& exceptionState) const
 {
     if (raiseExceptionIfMutationNotAllowed(exceptionState))
         return nullptr;
     if (raiseExceptionIfNotMutable(CompositorMutableProperty::kTransform, exceptionState))
         return nullptr;
-    return m_transform;
+    if (!m_state.get())
+        return DOMMatrix::create();
+    return DOMMatrix::create(m_state->transform());
 }
 
 void CompositorProxy::setOpacity(double opacity, ExceptionState& exceptionState)
 {
     if (raiseExceptionIfMutationNotAllowed(exceptionState))
         return;
     if (raiseExceptionIfNotMutable(CompositorMutableProperty::kOpacity, exceptionState))
         return;
-    m_opacity = std::min(1., std::max(0., opacity));
-    m_mutatedProperties |= CompositorMutableProperty::kTransform;
+    if (!m_state.get())
+        return;
+    opacity = std::min(1., std::max(0., opacity));
+    m_state->setOpacity(opacity);
 }
 
 void CompositorProxy::setScrollLeft(double scrollLeft, ExceptionState& exceptionState)
 {
     if (raiseExceptionIfMutationNotAllowed(exceptionState))
         return;
     if (raiseExceptionIfNotMutable(CompositorMutableProperty::kScrollLeft, exceptionState))
         return;
-    m_scrollLeft = scrollLeft;
-    m_mutatedProperties |= CompositorMutableProperty::kScrollLeft;
+    if (!m_state.get())
+        return;
+    m_state->setScrollLeft(scrollLeft);
 }
 
 void CompositorProxy::setScrollTop(double scrollTop, ExceptionState& exceptionState)
 {
     if (raiseExceptionIfMutationNotAllowed(exceptionState))
         return;
     if (raiseExceptionIfNotMutable(CompositorMutableProperty::kScrollTop, exceptionState))
         return;
-    m_scrollTop = scrollTop;
-    m_mutatedProperties |= CompositorMutableProperty::kScrollTop;
+    if (!m_state.get())
+        return;
+    m_state->setScrollTop(scrollTop);
 }
 
 void CompositorProxy::setTransform(DOMMatrix* transform, ExceptionState& exceptionState)
 {
     if (raiseExceptionIfMutationNotAllowed(exceptionState))
         return;
     if (raiseExceptionIfNotMutable(CompositorMutableProperty::kTransform, exceptionState))
         return;
-    m_transform = transform;
-    m_mutatedProperties |= CompositorMutableProperty::kTransform;
+    if (!m_state.get())
+        return;
+    m_state->setTransform(TransformationMatrix::toSkMatrix44(transform->matrix()));
 }
 
 bool CompositorProxy::raiseExceptionIfNotMutable(uint32_t property, ExceptionState& exceptionState) const
 {
     if (m_connected && (m_compositorMutableProperties & property))
         return false;
     exceptionState.throwDOMException(NoModificationAllowedError,
         m_connected ? "Attempted to mutate non-mutable attribute." : "Attempted to mutate attribute on a disconnected proxy.");
     return true;
 }
 
 void CompositorProxy::disconnect()
 {
+    if (!m_connected)
+        return;
     m_connected = false;
-    if (isMainThread())
+    if (isMainThread()) {
         decrementCompositorProxiedPropertiesForElement(m_elementId, m_compositorMutableProperties);
-    else
-        Platform::current()->mainThread()->taskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(&decrementCompositorProxiedPropertiesForElement, m_elementId, m_compositorMutableProperties));
+    } else {
+        Platform::current()->mainThread()->taskRunner()->postTask(
+            BLINK_FROM_HERE, threadSafeBind(&decrementCompositorProxiedPropertiesForElement, m_elementId, m_compositorMutableProperties));
+        if (m_client)
+            m_client->unregisterCompositorProxy(this);
+    }
+}
+
+void CompositorProxy::takeCompositorMutableState(PassOwnPtr<CompositorMutableState> state)
+{
+    m_state = state;
 }
 
 } // namespace blink