cc/layers/heads_up_display_layer.cc

// Copyright 2012 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/layers/heads_up_display_layer.h"

#include <algorithm>

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

namespace cc {

scoped_refptr<HeadsUpDisplayLayer> HeadsUpDisplayLayer::Create(
    const LayerSettings& settings) {
  return make_scoped_refptr(new HeadsUpDisplayLayer(settings));
}

HeadsUpDisplayLayer::HeadsUpDisplayLayer(const LayerSettings& settings)
    : Layer(settings) {
  SetIsDrawable(true);
  UpdateDrawsContent(HasDrawableContent());
}

HeadsUpDisplayLayer::~HeadsUpDisplayLayer() {}

void HeadsUpDisplayLayer::PrepareForCalculateDrawProperties(
    const gfx::Size& device_viewport, float device_scale_factor) {
  gfx::Size device_viewport_in_layout_pixels = gfx::Size(
      device_viewport.width() / device_scale_factor,
      device_viewport.height() / device_scale_factor);

  gfx::Size bounds;
  gfx::Transform matrix;
  matrix.MakeIdentity();

  if (layer_tree_host()->debug_state().ShowHudRects()) {
    int max_texture_size =
        layer_tree_host()->GetRendererCapabilities().max_texture_size;
    bounds.SetSize(std::min(max_texture_size,
                            device_viewport_in_layout_pixels.width()),
                   std::min(max_texture_size,
                            device_viewport_in_layout_pixels.height()));
  } else {
    int size = 256;
    bounds.SetSize(size, size);
    matrix.Translate(device_viewport_in_layout_pixels.width() - size, 0.0);
  }

  SetBounds(bounds);
  SetTransform(matrix);
}

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

scoped_ptr<LayerImpl> HeadsUpDisplayLayer::CreateLayerImpl(
    LayerTreeImpl* tree_impl) {
  return HeadsUpDisplayLayerImpl::Create(tree_impl, layer_id_);
}

}  // namespace cc