compositor-worker: Introduce CompositorProxy.

Source/core/dom/CompositorProxy.cpp

Index: Source/core/dom/CompositorProxy.cpp
diff --git a/Source/core/dom/CompositorProxy.cpp b/Source/core/dom/CompositorProxy.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d2282b7cf1c09867e7af806042c66fc0f616e612
--- /dev/null
+++ b/Source/core/dom/CompositorProxy.cpp
@@ -0,0 +1,83 @@
+// 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 "config.h"
+#include "core/dom/CompositorProxy.h"
+
+#include "bindings/core/v8/ExceptionMessages.h"
+#include "bindings/core/v8/ExceptionState.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/inspector/InspectorNodeIds.h"
+
+namespace blink {
+
+static struct {
+    const char* name;
+    CompositorProxy::Attributes attribute;
+} allowedAttributes[] = {

[esprehn, 2015/03/25 23:21:48]

Lets declare the struct and the usage separately, we don't generally combine
them like this in blink.

[sadrul, 2015/03/27 17:23:28]

Done.

+    { "opacity", CompositorProxy::Attributes::OPACITY },
+    { "scrolltop", CompositorProxy::Attributes::SCROLL_TOP },
+    { "touch", CompositorProxy::Attributes::TOUCH },
+    { "transform", CompositorProxy::Attributes::TRANSFORM },
+};
+
+CompositorProxy* CompositorProxy::create(ExecutionContext* context, Element* element, Vector<String>& attributeArray, ExceptionState& exceptionState)

[esprehn, 2015/03/25 23:21:48]

OwnPtr, this leaks when not in Oilpan mode.

+{
+    if (!context->isDocument()) {
+        exceptionState.throwTypeError(ExceptionMessages::failedToConstruct("CompositorProxy", "Can only be created from the main context."));
+        exceptionState.throwIfNeeded();
+        return nullptr;
+    }
+
+    uint32_t attributeFlags = 0;
+    for (const auto& attribute : attributeArray) {
+        Attributes currentAttribute = Attributes::NONE;
+        for (unsigned i = 0; i < arraysize(allowedAttributes); ++i) {
+            if (attribute.lower() == allowedAttributes[i].name) {

[esprehn, 2015/03/25 23:21:48]

Call .lower() first and then use std::lower_bound to binary search the array.
See RenderQuote, it should be easier than this.

[sadrul, 2015/03/27 17:23:28]

Done.

+                currentAttribute = allowedAttributes[i].attribute;
+            }
+        }
+        if (currentAttribute == Attributes::NONE) {
+            exceptionState.throwTypeError("Unknown attribute'" + attribute + "'");
+            exceptionState.throwIfNeeded();
+            return nullptr;
+        }
+        attributeFlags |= static_cast<uint32_t>(currentAttribute);
+    }
+
+    ASSERT(attributeFlags);

[esprehn, 2015/03/25 23:21:48]

This assert should be in the constructor?

[sadrul, 2015/03/27 17:23:28]

Done.

+    return new CompositorProxy(element, attributeFlags);
+}
+
+CompositorProxy* CompositorProxy::create(uint64_t elementId, uint32_t attributeFlags)
+{
+    ASSERT(!isMainThread());

[esprehn, 2015/03/25 23:21:48]

Move this assert into the constructor.

[sadrul, 2015/03/27 17:23:28]

Done.

+#ifndef NDEBUG
+    uint32_t sanityCheckAttributes = attributeFlags;

[esprehn, 2015/03/25 23:21:48]

This assert block for sanity checking should be in the constructor, it's okay to
put it into a static function in the file and call it in both constructors.
create methods should have almost no code in them.

[sadrul, 2015/03/27 17:23:28]

Done.

+    for (unsigned i = 0; i < arraysize(allowedAttributes); ++i) {
+        sanityCheckAttributes &= ~static_cast<uint32_t>(allowedAttributes[i].attribute);
+    }
+    ASSERT(!sanityCheckAttributes);
+#endif
+    return new CompositorProxy(elementId, attributeFlags);
+}
+
+CompositorProxy::CompositorProxy(Element* element, uint32_t attributeFlags)

[esprehn, 2015/03/25 23:21:48]

reference

[sadrul, 2015/03/27 17:23:28]

Done.

+    : m_elementId(InspectorNodeIds::idForNode(element))

[esprehn, 2015/03/25 23:21:48]

We should move InspectorNodeIds into code in a first patch.

[sadrul, 2015/03/27 17:23:28]

Done. (https://codereview.chromium.org/997073004/)

+    , m_attributes(attributeFlags)
+{
+    ASSERT(isMainThread());
+}
+
+CompositorProxy::CompositorProxy(uint64_t elementId, uint32_t attributeFlags)
+    : m_elementId(elementId)
+    , m_attributes(attributeFlags)
+{
+}
+
+CompositorProxy::~CompositorProxy()
+{
+}
+
+} // namespace blink