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/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   ~CopyHostContentLayerDelegate() override {}
  27
  28   // ui::LayerDelegate overrides:
  29   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   void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override {}
  47
  48   void OnDeviceScaleFactorChanged(float device_scale_factor) override {}
  49
  50   base::Closure PrepareForLayerBoundsChange() override {
  51     return base::Closure();
  52   }
  53
  54  private:
  55   aura::WindowTreeHost* host_;  // not owned
  56
  57   DISALLOW_COPY_AND_ASSIGN(CopyHostContentLayerDelegate);
  58 };
  59
  60 BootSplashScreen::BootSplashScreen(aura::WindowTreeHost* host)
  61     : layer_delegate_(new CopyHostContentLayerDelegate(host)),
  62       layer_(new ui::Layer(ui::LAYER_TEXTURED)) {
  63   layer_->set_delegate(layer_delegate_.get());
  64
  65   ui::Layer* root_layer = host->window()->layer();
  66   layer_->SetBounds(gfx::Rect(host->window()->bounds().size()));
  67   root_layer->Add(layer_.get());
  68   root_layer->StackAtTop(layer_.get());
  69 }
  70
  71 BootSplashScreen::~BootSplashScreen() {
  72 }
  73
  74 void BootSplashScreen::StartHideAnimation(base::TimeDelta duration) {
  75   ui::ScopedLayerAnimationSettings settings(layer_->GetAnimator());
  76   settings.SetTransitionDuration(duration);
  77   settings.SetPreemptionStrategy(ui::LayerAnimator::REPLACE_QUEUED_ANIMATIONS);
  78   layer_->SetOpacity(0.0f);
  79 }
  80
  81 }  // namespace ash