compositor-worker: Introduce WebCompositorMutableState

cc/blink/web_compositor_mutable_state_impl.cc

+// 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 "cc/blink/web_compositor_mutable_state_impl.h"
+
+#include "cc/animation/layer_tree_mutation.h"
+#include "cc/layers/layer_impl.h"
+#include "cc/trees/layer_tree_impl.h"
+
+namespace cc_blink {
+
+WebCompositorMutableStateImpl::WebCompositorMutableStateImpl(
+    cc::LayerTreeMutation* mutation,
+    cc::LayerImpl* main_layer,
+    cc::LayerImpl* scroll_layer)
+    : mutation_(mutation),
+      main_layer_(main_layer),
+      scroll_layer_(scroll_layer) {}
+
+WebCompositorMutableStateImpl::~WebCompositorMutableStateImpl() {}
+
+double WebCompositorMutableStateImpl::opacity() const {
+  return main_layer_->opacity();
+}
+
+void WebCompositorMutableStateImpl::setOpacity(double opacity) {
+  if (!main_layer_)
+    return;
+  main_layer_->OnOpacityAnimated(opacity);
+  mutation_->SetOpacity(opacity);
+}
+
+const SkMatrix44& WebCompositorMutableStateImpl::transform() const {
+  static SkMatrix44 identity;
+  return main_layer_ ? main_layer_->transform().matrix() : identity;
+}
+
+void WebCompositorMutableStateImpl::setTransform(const SkMatrix44& matrix) {
+  if (!main_layer_)
+    return;
+  main_layer_->OnTransformAnimated(gfx::Transform(matrix));

[ajuma, 2015/12/14 19:41:47]

Are property tree nodes currently created for mutable layers, or is that in a
future CL?

[Ian Vollick, 2015/12/14 20:22:06]

This is certainly necessary, but it is in a future CL.

+  mutation_->SetTransform(matrix);
+}
+
+double WebCompositorMutableStateImpl::scrollLeft() const {
+  return scroll_layer_ ? scroll_layer_->CurrentScrollOffset().x() : 0.0;
+}
+
+void WebCompositorMutableStateImpl::setScrollLeft(double scroll_left) {
+  if (!scroll_layer_)
+    return;
+  gfx::ScrollOffset offset = scroll_layer_->CurrentScrollOffset();
+  offset.set_x(scroll_left);
+  scroll_layer_->OnScrollOffsetAnimated(offset);
+  mutation_->SetScrollLeft(scroll_left);
+}
+
+double WebCompositorMutableStateImpl::scrollTop() const {
+  return scroll_layer_ ? scroll_layer_->CurrentScrollOffset().y() : 0.0;
+}
+
+void WebCompositorMutableStateImpl::setScrollTop(double scroll_top) {
+  if (!scroll_layer_)
+    return;
+  gfx::ScrollOffset offset = scroll_layer_->CurrentScrollOffset();
+  offset.set_y(scroll_top);
+  scroll_layer_->OnScrollOffsetAnimated(offset);
+  mutation_->SetScrollTop(scroll_top);
+}
+
+}  // namespace cc_blink