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      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
     76