// Copyright 2014 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_layer_impl.h"

#include <stddef.h>
#include <stdint.h>

#include <utility>
#include <vector>

#include "base/bind.h"
#include "base/lazy_instance.h"
#include "base/strings/string_util.h"
#include "base/threading/thread_checker.h"
#include "base/trace_event/trace_event_impl.h"
#include "cc/animation/animation.h"
#include "cc/base/region.h"
#include "cc/base/switches.h"
#include "cc/blink/web_animation_impl.h"
#include "cc/blink/web_blend_mode.h"
#include "cc/blink/web_filter_operations_impl.h"
#include "cc/blink/web_to_cc_animation_delegate_adapter.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_position_constraint.h"
#include "cc/layers/layer_settings.h"
#include "cc/trees/layer_tree_host.h"
#include "third_party/WebKit/public/platform/WebFloatPoint.h"
#include "third_party/WebKit/public/platform/WebFloatRect.h"
#include "third_party/WebKit/public/platform/WebLayerPositionConstraint.h"
#include "third_party/WebKit/public/platform/WebLayerScrollClient.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/skia/include/utils/SkMatrix44.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/vector2d_conversions.h"

using cc::Animation;
using cc::Layer;
using blink::WebLayer;
using blink::WebFloatPoint;
using blink::WebVector;
using blink::WebRect;
using blink::WebSize;
using blink::WebColor;
using blink::WebFilterOperations;

namespace cc_blink {
namespace {

base::LazyInstance<cc::LayerSettings> g_layer_settings =
    LAZY_INSTANCE_INITIALIZER;

}  // namespace

WebLayerImpl::WebLayerImpl()
    : layer_(Layer::Create(LayerSettings())), contents_opaque_is_fixed_(false) {
}

WebLayerImpl::WebLayerImpl(scoped_refptr<Layer> layer)
    : layer_(layer), contents_opaque_is_fixed_(false) {
}

WebLayerImpl::~WebLayerImpl() {
  if (animation_delegate_adapter_.get())
    layer_->set_layer_animation_delegate(nullptr);
  layer_->SetLayerClient(nullptr);
}

// static
void WebLayerImpl::SetLayerSettings(const cc::LayerSettings& settings) {
  g_layer_settings.Get() = settings;
}

// static
const cc::LayerSettings& WebLayerImpl::LayerSettings() {
  return g_layer_settings.Get();
}

int WebLayerImpl::id() const {
  return layer_->id();
}

void WebLayerImpl::invalidateRect(const blink::WebRect& rect) {
  layer_->SetNeedsDisplayRect(rect);
}

void WebLayerImpl::invalidate() {
  layer_->SetNeedsDisplay();
}

void WebLayerImpl::addChild(WebLayer* child) {
  layer_->AddChild(static_cast<WebLayerImpl*>(child)->layer());
}

void WebLayerImpl::insertChild(WebLayer* child, size_t index) {
  layer_->InsertChild(static_cast<WebLayerImpl*>(child)->layer(), index);
}

void WebLayerImpl::replaceChild(WebLayer* reference, WebLayer* new_layer) {
  layer_->ReplaceChild(static_cast<WebLayerImpl*>(reference)->layer(),
                       static_cast<WebLayerImpl*>(new_layer)->layer());
}

void WebLayerImpl::removeFromParent() {
  layer_->RemoveFromParent();
}

void WebLayerImpl::removeAllChildren() {
  layer_->RemoveAllChildren();
}

void WebLayerImpl::setBounds(const WebSize& size) {
  layer_->SetBounds(size);
}

WebSize WebLayerImpl::bounds() const {
  return layer_->bounds();
}

void WebLayerImpl::setMasksToBounds(bool masks_to_bounds) {
  layer_->SetMasksToBounds(masks_to_bounds);
}

bool WebLayerImpl::masksToBounds() const {
  return layer_->masks_to_bounds();
}

void WebLayerImpl::setMaskLayer(WebLayer* maskLayer) {
  layer_->SetMaskLayer(
      maskLayer ? static_cast<WebLayerImpl*>(maskLayer)->layer() : 0);
}

void WebLayerImpl::setReplicaLayer(WebLayer* replica_layer) {
  layer_->SetReplicaLayer(
      replica_layer ? static_cast<WebLayerImpl*>(replica_layer)->layer() : 0);
}

void WebLayerImpl::setOpacity(float opacity) {
  layer_->SetOpacity(opacity);
}

float WebLayerImpl::opacity() const {
  return layer_->opacity();
}

void WebLayerImpl::setBlendMode(blink::WebBlendMode blend_mode) {
  layer_->SetBlendMode(BlendModeToSkia(blend_mode));
}

blink::WebBlendMode WebLayerImpl::blendMode() const {
  return BlendModeFromSkia(layer_->blend_mode());
}

void WebLayerImpl::setIsRootForIsolatedGroup(bool isolate) {
  layer_->SetIsRootForIsolatedGroup(isolate);
}

bool WebLayerImpl::isRootForIsolatedGroup() {
  return layer_->is_root_for_isolated_group();
}

void WebLayerImpl::setOpaque(bool opaque) {
  if (contents_opaque_is_fixed_)
    return;
  layer_->SetContentsOpaque(opaque);
}

bool WebLayerImpl::opaque() const {
  return layer_->contents_opaque();
}

void WebLayerImpl::setPosition(const WebFloatPoint& position) {
  layer_->SetPosition(position);
}

WebFloatPoint WebLayerImpl::position() const {
  return layer_->position();
}

void WebLayerImpl::setTransform(const SkMatrix44& matrix) {
  gfx::Transform transform;
  transform.matrix() = matrix;
  layer_->SetTransform(transform);
}

void WebLayerImpl::setTransformOrigin(const blink::WebFloatPoint3D& point) {
  gfx::Point3F gfx_point = point;
  layer_->SetTransformOrigin(gfx_point);
}

blink::WebFloatPoint3D WebLayerImpl::transformOrigin() const {
  return layer_->transform_origin();
}

SkMatrix44 WebLayerImpl::transform() const {
  return layer_->transform().matrix();
}

void WebLayerImpl::setDrawsContent(bool draws_content) {
  layer_->SetIsDrawable(draws_content);
}

bool WebLayerImpl::drawsContent() const {
  return layer_->DrawsContent();
}

void WebLayerImpl::setDoubleSided(bool double_sided) {
  layer_->SetDoubleSided(double_sided);
}

void WebLayerImpl::setShouldFlattenTransform(bool flatten) {
  layer_->SetShouldFlattenTransform(flatten);
}

void WebLayerImpl::setRenderingContext(int context) {
  layer_->Set3dSortingContextId(context);
}

void WebLayerImpl::setUseParentBackfaceVisibility(
    bool use_parent_backface_visibility) {
  layer_->set_use_parent_backface_visibility(use_parent_backface_visibility);
}

void WebLayerImpl::setBackgroundColor(WebColor color) {
  layer_->SetBackgroundColor(color);
}

WebColor WebLayerImpl::backgroundColor() const {
  return layer_->background_color();
}

void WebLayerImpl::setFilters(const WebFilterOperations& filters) {
  const WebFilterOperationsImpl& filters_impl =
      static_cast<const WebFilterOperationsImpl&>(filters);
  layer_->SetFilters(filters_impl.AsFilterOperations());
}

void WebLayerImpl::setBackgroundFilters(const WebFilterOperations& filters) {
  const WebFilterOperationsImpl& filters_impl =
      static_cast<const WebFilterOperationsImpl&>(filters);
  layer_->SetBackgroundFilters(filters_impl.AsFilterOperations());
}

void WebLayerImpl::setAnimationDelegate(
    blink::WebCompositorAnimationDelegate* delegate) {
  if (!delegate) {
    animation_delegate_adapter_.reset();
    layer_->set_layer_animation_delegate(nullptr);
    return;
  }
  animation_delegate_adapter_.reset(
      new WebToCCAnimationDelegateAdapter(delegate));
  layer_->set_layer_animation_delegate(animation_delegate_adapter_.get());
}

bool WebLayerImpl::addAnimation(blink::WebCompositorAnimation* animation) {
  bool result = layer_->AddAnimation(
      static_cast<WebCompositorAnimationImpl*>(animation)->PassAnimation());
  delete animation;
  return result;
}

void WebLayerImpl::removeAnimation(int animation_id) {
  layer_->RemoveAnimation(animation_id);
}

void WebLayerImpl::removeAnimation(
    int animation_id,
    blink::WebCompositorAnimation::TargetProperty target_property) {
  layer_->RemoveAnimation(
      animation_id, static_cast<Animation::TargetProperty>(target_property));
}

void WebLayerImpl::pauseAnimation(int animation_id, double time_offset) {
  layer_->PauseAnimation(animation_id, time_offset);
}

void WebLayerImpl::abortAnimation(int animation_id) {
  layer_->AbortAnimation(animation_id);
}

bool WebLayerImpl::hasActiveAnimation() {
  return layer_->HasActiveAnimation();
}

void WebLayerImpl::setForceRenderSurface(bool force_render_surface) {
  layer_->SetForceRenderSurface(force_render_surface);
}

void WebLayerImpl::setScrollPositionDouble(blink::WebDoublePoint position) {
  layer_->SetScrollOffset(gfx::ScrollOffset(position.x, position.y));
}

void WebLayerImpl::setScrollCompensationAdjustment(
    blink::WebDoublePoint position) {
  layer_->SetScrollCompensationAdjustment(
      gfx::Vector2dF(position.x, position.y));
}

blink::WebDoublePoint WebLayerImpl::scrollPositionDouble() const {
  return blink::WebDoublePoint(layer_->scroll_offset().x(),
                               layer_->scroll_offset().y());
}

void WebLayerImpl::setScrollClipLayer(WebLayer* clip_layer) {
  if (!clip_layer) {
    layer_->SetScrollClipLayerId(Layer::INVALID_ID);
    return;
  }
  layer_->SetScrollClipLayerId(clip_layer->id());
}

bool WebLayerImpl::scrollable() const {
  return layer_->scrollable();
}

void WebLayerImpl::setUserScrollable(bool horizontal, bool vertical) {
  layer_->SetUserScrollable(horizontal, vertical);
}

bool WebLayerImpl::userScrollableHorizontal() const {
  return layer_->user_scrollable_horizontal();
}

bool WebLayerImpl::userScrollableVertical() const {
  return layer_->user_scrollable_vertical();
}

void WebLayerImpl::setHaveWheelEventHandlers(bool have_wheel_event_handlers) {
  layer_->SetHaveWheelEventHandlers(have_wheel_event_handlers);
}

bool WebLayerImpl::haveWheelEventHandlers() const {
  return layer_->have_wheel_event_handlers();
}

void WebLayerImpl::setHaveScrollEventHandlers(bool have_scroll_event_handlers) {
  layer_->SetHaveScrollEventHandlers(have_scroll_event_handlers);
}

bool WebLayerImpl::haveScrollEventHandlers() const {
  return layer_->have_scroll_event_handlers();
}

void WebLayerImpl::addMainThreadScrollingReasons(
    uint32_t main_thread_scrolling_reasons) {
  DCHECK(main_thread_scrolling_reasons);
  // WebLayerImpl should only know about non-transient scrolling
  // reasons. Transient scrolling reasons are computed per hit test.
  // TODO(tdresser): This is comparing less than a bit flag but that's not valid
  // if there is more than one reason given in |main_thread_scrolling_reasons|.
  DCHECK_LE(main_thread_scrolling_reasons,
            cc::MainThreadScrollingReason::kMaxNonTransientScrollingReason);
  layer_->AddMainThreadScrollingReasons(main_thread_scrolling_reasons);
}

void WebLayerImpl::clearMainThreadScrollingReasons() {
  layer_->ClearMainThreadScrollingReasons();
}

bool WebLayerImpl::shouldScrollOnMainThread() const {
  return layer_->should_scroll_on_main_thread();
}

void WebLayerImpl::setNonFastScrollableRegion(const WebVector<WebRect>& rects) {
  cc::Region region;
  for (size_t i = 0; i < rects.size(); ++i)
    region.Union(rects[i]);
  layer_->SetNonFastScrollableRegion(region);
}

WebVector<WebRect> WebLayerImpl::nonFastScrollableRegion() const {
  size_t num_rects = 0;
  for (cc::Region::Iterator region_rects(layer_->non_fast_scrollable_region());
       region_rects.has_rect();
       region_rects.next())
    ++num_rects;

  WebVector<WebRect> result(num_rects);
  size_t i = 0;
  for (cc::Region::Iterator region_rects(layer_->non_fast_scrollable_region());
       region_rects.has_rect();
       region_rects.next()) {
    result[i] = region_rects.rect();
    ++i;
  }
  return result;
}

void WebLayerImpl::setFrameTimingRequests(
    const WebVector<std::pair<int64_t, WebRect>>& requests) {
  std::vector<cc::FrameTimingRequest> frame_timing_requests(requests.size());
  for (size_t i = 0; i < requests.size(); ++i) {
    frame_timing_requests[i] = cc::FrameTimingRequest(
        requests[i].first, gfx::Rect(requests[i].second));
  }
  layer_->SetFrameTimingRequests(frame_timing_requests);
}

WebVector<std::pair<int64_t, WebRect>> WebLayerImpl::frameTimingRequests()
    const {
  const std::vector<cc::FrameTimingRequest>& frame_timing_requests =
      layer_->FrameTimingRequests();

  size_t num_requests = frame_timing_requests.size();

  WebVector<std::pair<int64_t, WebRect>> result(num_requests);
  for (size_t i = 0; i < num_requests; ++i) {
    result[i] = std::make_pair(frame_timing_requests[i].id(),
                               frame_timing_requests[i].rect());
  }
  return result;
}

void WebLayerImpl::setTouchEventHandlerRegion(const WebVector<WebRect>& rects) {
  cc::Region region;
  for (size_t i = 0; i < rects.size(); ++i)
    region.Union(rects[i]);
  layer_->SetTouchEventHandlerRegion(region);
}

WebVector<WebRect> WebLayerImpl::touchEventHandlerRegion() const {
  size_t num_rects = 0;
  for (cc::Region::Iterator region_rects(layer_->touch_event_handler_region());
       region_rects.has_rect();
       region_rects.next())
    ++num_rects;

  WebVector<WebRect> result(num_rects);
  size_t i = 0;
  for (cc::Region::Iterator region_rects(layer_->touch_event_handler_region());
       region_rects.has_rect();
       region_rects.next()) {
    result[i] = region_rects.rect();
    ++i;
  }
  return result;
}

static_assert(static_cast<ScrollBlocksOn>(blink::WebScrollBlocksOnNone) ==
                  SCROLL_BLOCKS_ON_NONE,
              "ScrollBlocksOn and WebScrollBlocksOn enums must match");
static_assert(static_cast<ScrollBlocksOn>(blink::WebScrollBlocksOnStartTouch) ==
                  SCROLL_BLOCKS_ON_START_TOUCH,
              "ScrollBlocksOn and WebScrollBlocksOn enums must match");
static_assert(static_cast<ScrollBlocksOn>(blink::WebScrollBlocksOnWheelEvent) ==
                  SCROLL_BLOCKS_ON_WHEEL_EVENT,
              "ScrollBlocksOn and WebScrollBlocksOn enums must match");
static_assert(
    static_cast<ScrollBlocksOn>(blink::WebScrollBlocksOnScrollEvent) ==
        SCROLL_BLOCKS_ON_SCROLL_EVENT,
    "ScrollBlocksOn and WebScrollBlocksOn enums must match");

void WebLayerImpl::setScrollBlocksOn(blink::WebScrollBlocksOn blocks) {
  layer_->SetScrollBlocksOn(static_cast<ScrollBlocksOn>(blocks));
}

blink::WebScrollBlocksOn WebLayerImpl::scrollBlocksOn() const {
  return static_cast<blink::WebScrollBlocksOn>(layer_->scroll_blocks_on());
}

void WebLayerImpl::setIsContainerForFixedPositionLayers(bool enable) {
  layer_->SetIsContainerForFixedPositionLayers(enable);
}

bool WebLayerImpl::isContainerForFixedPositionLayers() const {
  return layer_->IsContainerForFixedPositionLayers();
}

static blink::WebLayerPositionConstraint ToWebLayerPositionConstraint(
    const cc::LayerPositionConstraint& constraint) {
  blink::WebLayerPositionConstraint web_constraint;
  web_constraint.isFixedPosition = constraint.is_fixed_position();
  web_constraint.isFixedToRightEdge = constraint.is_fixed_to_right_edge();
  web_constraint.isFixedToBottomEdge = constraint.is_fixed_to_bottom_edge();
  return web_constraint;
}

static cc::LayerPositionConstraint ToLayerPositionConstraint(
    const blink::WebLayerPositionConstraint& web_constraint) {
  cc::LayerPositionConstraint constraint;
  constraint.set_is_fixed_position(web_constraint.isFixedPosition);
  constraint.set_is_fixed_to_right_edge(web_constraint.isFixedToRightEdge);
  constraint.set_is_fixed_to_bottom_edge(web_constraint.isFixedToBottomEdge);
  return constraint;
}

void WebLayerImpl::setPositionConstraint(
    const blink::WebLayerPositionConstraint& constraint) {
  layer_->SetPositionConstraint(ToLayerPositionConstraint(constraint));
}

blink::WebLayerPositionConstraint WebLayerImpl::positionConstraint() const {
  return ToWebLayerPositionConstraint(layer_->position_constraint());
}

void WebLayerImpl::setScrollClient(blink::WebLayerScrollClient* scroll_client) {
  if (scroll_client) {
    layer_->set_did_scroll_callback(
        base::Bind(&blink::WebLayerScrollClient::didScroll,
                   base::Unretained(scroll_client)));
  } else {
    layer_->set_did_scroll_callback(base::Closure());
  }
}

bool WebLayerImpl::isOrphan() const {
  return !layer_->layer_tree_host();
}

void WebLayerImpl::setLayerClient(cc::LayerClient* client) {
  layer_->SetLayerClient(client);
}

const cc::Layer* WebLayerImpl::ccLayer() const {
  return layer_.get();
}

void WebLayerImpl::setElementId(uint64_t id) {
  layer_->SetElementId(id);
}

uint64_t WebLayerImpl::elementId() const {
  return layer_->element_id();
}

void WebLayerImpl::setCompositorMutableProperties(uint32_t properties) {
  layer_->SetMutableProperties(properties);
}

uint32_t WebLayerImpl::compositorMutableProperties() const {
  return layer_->mutable_properties();
}

void WebLayerImpl::setScrollParent(blink::WebLayer* parent) {
  cc::Layer* scroll_parent = nullptr;
  if (parent)
    scroll_parent = static_cast<WebLayerImpl*>(parent)->layer();
  layer_->SetScrollParent(scroll_parent);
}

void WebLayerImpl::setClipParent(blink::WebLayer* parent) {
  cc::Layer* clip_parent = nullptr;
  if (parent)
    clip_parent = static_cast<WebLayerImpl*>(parent)->layer();
  layer_->SetClipParent(clip_parent);
}

Layer* WebLayerImpl::layer() const {
  return layer_.get();
}

void WebLayerImpl::SetContentsOpaqueIsFixed(bool fixed) {
  contents_opaque_is_fixed_ = fixed;
}

}  // namespace cc_blink