Index: third_party/WebKit/Source/platform/graphics/CompositorMutableStateProvider.cpp |
diff --git a/third_party/WebKit/Source/platform/graphics/CompositorMutableStateProvider.cpp b/third_party/WebKit/Source/platform/graphics/CompositorMutableStateProvider.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..84704a587380df3810f12ea0f757d75cb8d8b9fe |
--- /dev/null |
+++ b/third_party/WebKit/Source/platform/graphics/CompositorMutableStateProvider.cpp |
@@ -0,0 +1,34 @@ |
+// Copyright 2016 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 "platform/graphics/CompositorMutableStateProvider.h" |
+ |
+#include "cc/layers/layer_impl.h" |
+#include "cc/trees/layer_tree_impl.h" |
+#include "platform/graphics/CompositorMutableState.h" |
+#include "platform/graphics/CompositorMutation.h" |
+#include "wtf/PassOwnPtr.h" |
+ |
+namespace blink { |
+ |
+CompositorMutableStateProvider::CompositorMutableStateProvider(cc::LayerTreeImpl* state, CompositorMutations* mutations) |
+ : m_state(state) |
+ , m_mutations(mutations) |
+{ |
+} |
+ |
+CompositorMutableStateProvider::~CompositorMutableStateProvider() {} |
+ |
+PassOwnPtr<CompositorMutableState> |
+CompositorMutableStateProvider::getMutableStateFor(uint64_t element_id) |
+{ |
+ cc::LayerTreeImpl::ElementLayers layers = m_state->GetMutableLayers(element_id); |
+ |
+ if (!layers.main && !layers.scroll) |
+ return nullptr; |
+ |
+ return adoptPtr(new CompositorMutableState(&m_mutations->map.find(element_id)->value, layers.main, layers.scroll)); |
jbroman
2016/01/18 21:40:26
One caveat here: IIUC std::map guarantees that ite
Ian Vollick
2016/01/18 21:56:40
Ah, right. No, this is a problem. I've gone back t
Ian Vollick
2016/01/19 14:49:30
I remembered that Elliott had already suggested th
|
+} |
+ |
+} // namespace blink |