cc/layers/heads_up_display_layer.cc

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/layers/heads_up_display_layer.h"

#include <algorithm>
#include <utility>
#include <vector>

#include "base/trace_event/trace_event.h"
#include "cc/layers/heads_up_display_layer_impl.h"
#include "cc/trees/layer_tree_host.h"
#include "skia/ext/font_utils.h"

namespace cc {

scoped_refptr<HeadsUpDisplayLayer> HeadsUpDisplayLayer::Create() {
  return base::WrapRefCounted(new HeadsUpDisplayLayer());
}

HeadsUpDisplayLayer::HeadsUpDisplayLayer()
    : typeface_(skia::MakeTypefaceFromName("Arial", SkFontStyle())) {
  if (!typeface_.Read(*this)) {
    typeface_.Write(*this) =
        skia::MakeTypefaceFromName("monospace", SkFontStyle::Bold());
    SetNeedsPushProperties();
  }
  DCHECK(typeface_.Read(*this).get());
  SetIsDrawable(true);
}

HeadsUpDisplayLayer::~HeadsUpDisplayLayer() = default;

void HeadsUpDisplayLayer::SetLayerTreeHost(LayerTreeHost* host) {
  if (host && host != layer_tree_host()) {
    paused_debugger_message_ =
        host->client()->GetPausedDebuggerLocalizedMessage();
  }
  Layer::SetLayerTreeHost(host);
}

void HeadsUpDisplayLayer::UpdateLocationAndSize(
    const gfx::Size& device_viewport,
    float device_scale_factor) {
  float multiplier = 1.f / (device_scale_factor *
                            layer_tree_host()->painted_device_scale_factor());
  gfx::Size device_viewport_in_dips =
      gfx::ScaleToFlooredSize(device_viewport, multiplier);

  gfx::Size bounds_in_dips;

  // If the HUD is not displaying full-viewport rects (e.g., it is showing the
  // Frame Rendering Stats), use a fixed size.
  constexpr int kDefaultHUDSize = 256;
  bounds_in_dips.SetSize(kDefaultHUDSize, kDefaultHUDSize);

  if (layer_tree_host()->GetDebugState().ShowDebugRects() ||
      layer_tree_host()->GetDebugState().debugger_paused) {
    bounds_in_dips = device_viewport_in_dips;
  }

  // DIPs are layout coordinates if painted dsf is 1. If it's not 1, then layout
  // coordinates are DIPs * painted dsf.
  auto bounds_in_layout_space = gfx::ScaleToCeiledSize(
      bounds_in_dips, layer_tree_host()->painted_device_scale_factor());

  SetBounds(bounds_in_layout_space);
}

void HeadsUpDisplayLayer::ClearWebVitalsDebugRects() {
  web_vitals_debug_rects_.Write(*this).clear();
  SetNeedsPushProperties();
}

void HeadsUpDisplayLayer::AddWebVitalsDebugRect(
    const WebVitalsDebugRect& rect) {
  web_vitals_debug_rects_.Write(*this).push_back(rect);
  SetNeedsPushProperties();
}

bool HeadsUpDisplayLayer::HasDrawableContent() const {
  return true;
}

std::unique_ptr<LayerImpl> HeadsUpDisplayLayer::CreateLayerImpl(
    LayerTreeImpl* tree_impl) const {
  return HeadsUpDisplayLayerImpl::Create(tree_impl, id(),
                                         paused_debugger_message_);
}

void HeadsUpDisplayLayer::PushDirtyPropertiesTo(
    LayerImpl* layer,
    uint8_t dirty_flag,
    const CommitState& commit_state,
    const ThreadUnsafeCommitState& unsafe_state) {
  Layer::PushDirtyPropertiesTo(layer, dirty_flag, commit_state, unsafe_state);

  if (dirty_flag & kChangedGeneralProperty) {
    TRACE_EVENT0("cc", "HeadsUpDisplayLayer::PushPropertiesTo");
    HeadsUpDisplayLayerImpl* layer_impl =
        static_cast<HeadsUpDisplayLayerImpl*>(layer);

    layer_impl->SetHUDTypeface(typeface_.Write(*this));
    layer_impl->SetWebVitalsDebugRects(web_vitals_debug_rects_.Read(*this));
    web_vitals_debug_rects_.Write(*this).clear();
  }
}

}  // namespace cc