cc/layers/heads_up_display_layer.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/layers/heads_up_display_layer.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/trace_event/trace_event.h"
  10 #include "cc/layers/heads_up_display_layer_impl.h"
  11 #include "cc/trees/layer_tree_host.h"
  12
  13 namespace cc {
  14
  15 scoped_refptr<HeadsUpDisplayLayer> HeadsUpDisplayLayer::Create(
  16     const LayerSettings& settings) {
  17   return make_scoped_refptr(new HeadsUpDisplayLayer(settings));
  18 }
  19
  20 HeadsUpDisplayLayer::HeadsUpDisplayLayer(const LayerSettings& settings)
  21     : Layer(settings) {
  22   SetIsDrawable(true);
  23   UpdateDrawsContent(HasDrawableContent());
  24 }
  25
  26 HeadsUpDisplayLayer::~HeadsUpDisplayLayer() {}
  27
  28 void HeadsUpDisplayLayer::PrepareForCalculateDrawProperties(
  29     const gfx::Size& device_viewport, float device_scale_factor) {
  30   gfx::Size device_viewport_in_layout_pixels = gfx::Size(
  31       device_viewport.width() / device_scale_factor,
  32       device_viewport.height() / device_scale_factor);
  33
  34   gfx::Size bounds;
  35   gfx::Transform matrix;
  36   matrix.MakeIdentity();
  37
  38   if (layer_tree_host()->debug_state().ShowHudRects()) {
  39     int max_texture_size =
  40         layer_tree_host()->GetRendererCapabilities().max_texture_size;
  41     bounds.SetSize(std::min(max_texture_size,
  42                             device_viewport_in_layout_pixels.width()),
  43                    std::min(max_texture_size,
  44                             device_viewport_in_layout_pixels.height()));
  45   } else {
  46     int size = 256;
  47     bounds.SetSize(size, size);
  48     matrix.Translate(device_viewport_in_layout_pixels.width() - size, 0.0);
  49   }
  50
  51   SetBounds(bounds);
  52   SetTransform(matrix);
  53 }
  54
  55 bool HeadsUpDisplayLayer::HasDrawableContent() const {
  56   return true;
  57 }
  58
  59 scoped_ptr<LayerImpl> HeadsUpDisplayLayer::CreateLayerImpl(
  60     LayerTreeImpl* tree_impl) {
  61   return HeadsUpDisplayLayerImpl::Create(tree_impl, layer_id_);
  62 }
  63
  64 }  // namespace cc