src/ash/wm/boot_splash_screen_chromeos.cc

   1 // Copyright 2013 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 "ash/wm/boot_splash_screen_chromeos.h"
   6
   7 #include "third_party/skia/include/core/SkBitmap.h"
   8 #include "ui/aura/root_window.h"
   9 #include "ui/base/x/x11_util.h"
  10 #include "ui/compositor/layer.h"
  11 #include "ui/compositor/layer_type.h"
  12 #include "ui/compositor/scoped_layer_animation_settings.h"
  13 #include "ui/gfx/canvas.h"
  14
  15 namespace ash {
  16 namespace internal {
  17
  18 // ui::LayerDelegate that copies the aura host window's content to a ui::Layer.
  19 class BootSplashScreen::CopyHostContentLayerDelegate
  20     : public ui::LayerDelegate {
  21  public:
  22   explicit CopyHostContentLayerDelegate(aura::RootWindow* root_window)
  23       : root_window_(root_window) {
  24   }
  25
  26   virtual ~CopyHostContentLayerDelegate() {}
  27
  28   // ui::LayerDelegate overrides:
  29   virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE {
  30     // It'd be safer to copy the area to a canvas in the constructor and then
  31     // copy from that canvas to this one here, but this appears to work (i.e. we
  32     // only call this before we draw our first frame) and it saves us an extra
  33     // copy.
  34     // TODO(derat): Instead of copying the data, use GLX_EXT_texture_from_pixmap
  35     // to create a zero-copy texture (when possible):
  36     // https://codereview.chromium.org/10543125
  37     ui::CopyAreaToCanvas(root_window_->GetAcceleratedWidget(),
  38         gfx::Rect(root_window_->GetHostOrigin(), root_window_->GetHostSize()),
  39         gfx::Point(), canvas);
  40   }
  41
  42   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE {}
  43
  44   virtual base::Closure PrepareForLayerBoundsChange() OVERRIDE {
  45     return base::Closure();
  46   }
  47
  48  private:
  49   aura::RootWindow* root_window_;  // not owned
  50
  51   DISALLOW_COPY_AND_ASSIGN(CopyHostContentLayerDelegate);
  52 };
  53
  54 BootSplashScreen::BootSplashScreen(aura::RootWindow* root_window)
  55     : layer_delegate_(new CopyHostContentLayerDelegate(root_window)),
  56       layer_(new ui::Layer(ui::LAYER_TEXTURED)) {
  57   layer_->set_delegate(layer_delegate_.get());
  58
  59   ui::Layer* root_layer = root_window->layer();
  60   layer_->SetBounds(gfx::Rect(root_layer->bounds().size()));
  61   root_layer->Add(layer_.get());
  62   root_layer->StackAtTop(layer_.get());
  63 }
  64
  65 BootSplashScreen::~BootSplashScreen() {
  66 }
  67
  68 void BootSplashScreen::StartHideAnimation(base::TimeDelta duration) {
  69   ui::ScopedLayerAnimationSettings settings(layer_->GetAnimator());
  70   settings.SetTransitionDuration(duration);
  71   settings.SetPreemptionStrategy(ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
  72   layer_->SetOpacity(0.0f);
  73 }
  74
  75 }  // namespace internal
  76 }  // namespace ash