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      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/window.h"
      9 #include "ui/aura/window_tree_host.h"
     10 #include "ui/base/x/x11_util.h"
     11 #include "ui/compositor/layer.h"
     12 #include "ui/compositor/layer_type.h"
     13 #include "ui/compositor/scoped_layer_animation_settings.h"
     14 #include "ui/gfx/canvas.h"
     15 
     16 namespace ash {
     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::WindowTreeHost* host)
     23       : host_(host) {
     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 #if defined(USE_X11)
     38     ui::CopyAreaToCanvas(host_->GetAcceleratedWidget(),
     39         host_->GetBounds(), gfx::Point(), canvas);
     40 #else
     41     // TODO(spang): Figure out what to do here.
     42     NOTIMPLEMENTED();
     43 #endif
     44   }
     45 
     46   virtual void OnDelegatedFrameDamage(
     47       const gfx::Rect& damage_rect_in_dip) OVERRIDE {}
     48 
     49   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE {}
     50 
     51   virtual base::Closure PrepareForLayerBoundsChange() OVERRIDE {
     52     return base::Closure();
     53   }
     54 
     55  private:
     56   aura::WindowTreeHost* host_;  // not owned
     57 
     58   DISALLOW_COPY_AND_ASSIGN(CopyHostContentLayerDelegate);
     59 };
     60 
     61 BootSplashScreen::BootSplashScreen(aura::WindowTreeHost* host)
     62     : layer_delegate_(new CopyHostContentLayerDelegate(host)),
     63       layer_(new ui::Layer(ui::LAYER_TEXTURED)) {
     64   layer_->set_delegate(layer_delegate_.get());
     65 
     66   ui::Layer* root_layer = host->window()->layer();
     67   layer_->SetBounds(gfx::Rect(host->window()->bounds().size()));
     68   root_layer->Add(layer_.get());
     69   root_layer->StackAtTop(layer_.get());
     70 }
     71 
     72 BootSplashScreen::~BootSplashScreen() {
     73 }
     74 
     75 void BootSplashScreen::StartHideAnimation(base::TimeDelta duration) {
     76   ui::ScopedLayerAnimationSettings settings(layer_->GetAnimator());
     77   settings.SetTransitionDuration(duration);
     78   settings.SetPreemptionStrategy(ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
     79   layer_->SetOpacity(0.0f);
     80 }
     81 
     82 }  // namespace ash
     83