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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/wm/system_background_controller.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/aura/root_window.h"
#include "ui/base/layout.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_type.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
namespace ash {
namespace internal {
namespace {
#if defined(OS_CHROMEOS)
// Background color used for the Chrome OS boot splash screen.
const SkColor kChromeOsBootColor = SkColorSetARGB(0xff, 0xfe, 0xfe, 0xfe);
#endif
} // namespace
// ui::LayerDelegate that copies the aura host window's content to a ui::Layer.
class SystemBackgroundController::HostContentLayerDelegate
: public ui::LayerDelegate {
public:
explicit HostContentLayerDelegate(aura::RootWindow* root_window)
: root_window_(root_window) {
}
virtual ~HostContentLayerDelegate() {}
// ui::LayerDelegate overrides:
virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE {
// It'd be safer to copy the area to a canvas in the constructor and then
// copy from that canvas to this one here, but this appears to work (i.e. we
// only call this before we draw our first frame) and it saves us an extra
// copy.
root_window_->CopyAreaToSkCanvas(
gfx::Rect(root_window_->GetHostOrigin(), root_window_->GetHostSize()),
gfx::Point(), canvas->sk_canvas());
}
virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE {}
virtual base::Closure PrepareForLayerBoundsChange() OVERRIDE {
return base::Closure();
}
private:
aura::RootWindow* root_window_; // not owned
DISALLOW_COPY_AND_ASSIGN(HostContentLayerDelegate);
};
SystemBackgroundController::SystemBackgroundController(
aura::RootWindow* root_window,
Content initial_content)
: root_window_(root_window),
content_(CONTENT_INVALID) {
root_window_->AddRootWindowObserver(this);
SetContent(initial_content);
}
SystemBackgroundController::~SystemBackgroundController() {
root_window_->RemoveRootWindowObserver(this);
}
void SystemBackgroundController::SetContent(Content new_content) {
if (new_content == content_)
return;
content_ = new_content;
switch (new_content) {
case CONTENT_COPY_FROM_HOST:
CreateTexturedLayerWithHostContent();
break;
case CONTENT_BLACK:
CreateColoredLayer(SK_ColorBLACK);
break;
#if defined(OS_CHROMEOS)
case CONTENT_CHROME_OS_BOOT_COLOR:
CreateColoredLayer(kChromeOsBootColor);
break;
#endif
case CONTENT_INVALID:
DCHECK(false) << "Invalid background layer content";
}
}
void SystemBackgroundController::OnRootWindowResized(
const aura::RootWindow* root,
const gfx::Size& old_size) {
DCHECK_EQ(root_window_, root);
if (layer_.get())
UpdateLayerBounds(layer_.get());
}
void SystemBackgroundController::CreateTexturedLayerWithHostContent() {
layer_.reset();
layer_delegate_.reset(new HostContentLayerDelegate(root_window_));
layer_.reset(new ui::Layer(ui::LAYER_TEXTURED));
layer_->set_delegate(layer_delegate_.get());
UpdateLayerBounds(layer_.get());
AddLayerToRootLayer(layer_.get());
}
void SystemBackgroundController::CreateColoredLayer(SkColor color) {
layer_.reset();
layer_delegate_.reset();
layer_.reset(new ui::Layer(ui::LAYER_SOLID_COLOR));
layer_->SetColor(color);
UpdateLayerBounds(layer_.get());
AddLayerToRootLayer(layer_.get());
}
void SystemBackgroundController::UpdateLayerBounds(ui::Layer* layer) {
layer->SetBounds(gfx::Rect(root_window_->layer()->bounds().size()));
}
void SystemBackgroundController::AddLayerToRootLayer(ui::Layer* layer) {
ui::Layer* root_layer = root_window_->layer();
root_layer->Add(layer);
root_layer->StackAtBottom(layer);
}
} // namespace internal
} // namespace ash
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