compositor-worker: Remove code from cc_blink

third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp

+// 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/CompositorMutableState.h"
+
+#include "cc/layers/layer_impl.h"
+#include "cc/trees/layer_tree_impl.h"
+#include "platform/graphics/CompositorMutation.h"
+
+namespace blink {
+
+CompositorMutableState::CompositorMutableState(CompositorMutation* mutation, cc::LayerImpl* main, cc::LayerImpl* scroll)
+    : m_mutation(mutation)
+    , m_mainLayer(main)
+    , m_scrollLayer(scroll)
+{
+}
+
+CompositorMutableState::~CompositorMutableState() {}
+
+double CompositorMutableState::opacity() const
+{
+    return m_mainLayer->opacity();
+}
+
+void CompositorMutableState::setOpacity(double opacity)
+{
+    if (!m_mainLayer)
+        return;
+    m_mainLayer->OnOpacityAnimated(opacity);
+    m_mutation->setOpacity(opacity);
+}
+
+const SkMatrix44& CompositorMutableState::transform() const
+{
+    static SkMatrix44 identity;

[jbroman, 2016/01/18 19:07:22]

These both applied to the old cc code, so you may ignore on the basis that this
CL doesn't change them, but:

This constructor for SkMatrix44 is deprecated. Skia recommends explicitly
passing SkMatrix::kIdentity_Constructor. See, e.g.,
https://skia.googlesource.com/skia/+/973d92cf/include/utils/SkMatrix44.h#142

But better yet, I think you can just return SkMatrix44::I(), which is already a
const reference to a global static identity matrix.

[Ian Vollick, 2016/01/18 21:25:04]

Nice! Fixed.

+    return m_mainLayer ? m_mainLayer->transform().matrix() : identity;
+}
+
+void CompositorMutableState::setTransform(const SkMatrix44& matrix)
+{
+    if (!m_mainLayer)
+        return;
+    m_mainLayer->OnTransformAnimated(gfx::Transform(matrix));
+    m_mutation->setTransform(matrix);
+}
+
+double CompositorMutableState::scrollLeft() const
+{
+    return m_scrollLayer ? m_scrollLayer->CurrentScrollOffset().x() : 0.0;
+}
+
+void CompositorMutableState::setScrollLeft(double scrollLeft)
+{
+    if (!m_scrollLayer)
+        return;
+
+    gfx::ScrollOffset offset = m_scrollLayer->CurrentScrollOffset();
+    offset.set_x(scrollLeft);
+    m_scrollLayer->OnScrollOffsetAnimated(offset);
+    m_mutation->setScrollLeft(scrollLeft);
+}
+
+double CompositorMutableState::scrollTop() const
+{
+    return m_scrollLayer ? m_scrollLayer->CurrentScrollOffset().y() : 0.0;
+}
+
+void CompositorMutableState::setScrollTop(double scrollTop)
+{
+    if (!m_scrollLayer)
+        return;
+    gfx::ScrollOffset offset = m_scrollLayer->CurrentScrollOffset();
+    offset.set_y(scrollTop);
+    m_scrollLayer->OnScrollOffsetAnimated(offset);
+    m_mutation->setScrollTop(scrollTop);
+}
+
+} // namespace blink