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   return make_scoped_refptr(new HeadsUpDisplayLayer());
  17 }
  18
  19 HeadsUpDisplayLayer::HeadsUpDisplayLayer() {
  20   SetIsDrawable(true);
  21   UpdateDrawsContent(HasDrawableContent());
  22 }
  23
  24 HeadsUpDisplayLayer::~HeadsUpDisplayLayer() {}
  25
  26 void HeadsUpDisplayLayer::PrepareForCalculateDrawProperties(
  27     const gfx::Size& device_viewport, float device_scale_factor) {
  28   gfx::Size device_viewport_in_layout_pixels = gfx::Size(
  29       device_viewport.width() / device_scale_factor,
  30       device_viewport.height() / device_scale_factor);
  31
  32   gfx::Size bounds;
  33   gfx::Transform matrix;
  34   matrix.MakeIdentity();
  35
  36   if (layer_tree_host()->debug_state().ShowHudRects()) {
  37     int max_texture_size =
  38         layer_tree_host()->GetRendererCapabilities().max_texture_size;
  39     bounds.SetSize(std::min(max_texture_size,
  40                             device_viewport_in_layout_pixels.width()),
  41                    std::min(max_texture_size,
  42                             device_viewport_in_layout_pixels.height()));
  43   } else {
  44     int size = 256;
  45     bounds.SetSize(size, size);
  46     matrix.Translate(device_viewport_in_layout_pixels.width() - size, 0.0);
  47   }
  48
  49   SetBounds(bounds);
  50   SetTransform(matrix);
  51 }
  52
  53 bool HeadsUpDisplayLayer::HasDrawableContent() const {
  54   return true;
  55 }
  56
  57 scoped_ptr<LayerImpl> HeadsUpDisplayLayer::CreateLayerImpl(
  58     LayerTreeImpl* tree_impl) {
  59   return HeadsUpDisplayLayerImpl::Create(tree_impl, layer_id_);
  60 }
  61
  62 }  // namespace cc