// 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
{
    return m_mainLayer ? m_mainLayer->transform().matrix() : SkMatrix44::I();
}

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