ash/wm/boot_splash_screen.cc

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