Implement user selected wallpaper feature.

ash/desktop_background/desktop_background_view.cc

 // 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/desktop_background/desktop_background_view.h"
 
 #include <limits>
 
 #include "ash/ash_export.h"
 #include "ash/shell.h"
@@ skipping 43 matching lines @@
 
 // For our scaling ratios we need to round positive numbers.
 static int RoundPositive(double x) {
   return static_cast<int>(floor(x + 0.5));
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopBackgroundView, public:
 
 DesktopBackgroundView::DesktopBackgroundView(const SkBitmap& wallpaper,
-                                             ImageLayout layout) {
+                                             WallpaperLayout wallpaper_layout) {
   wallpaper_ = wallpaper;
-  image_layout_ = layout;
+  wallpaper_layout_ = wallpaper_layout;
   wallpaper_.buildMipMap(false);
 }
 
 DesktopBackgroundView::~DesktopBackgroundView() {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopBackgroundView, views::View overrides:
 
 void DesktopBackgroundView::OnPaint(gfx::Canvas* canvas) {
   // Scale the image while maintaining the aspect ratio, cropping as
   // necessary to fill the background. Ideally the image should be larger
   // than the largest display supported, if not we will center it rather than
   // streching to avoid upsampling artifacts (Note that we could tile too, but
   // decided not to do this at the moment).
   gfx::Rect wallpaper_rect(0, 0, wallpaper_.width(), wallpaper_.height());
-  if (image_layout_ == ash::CENTER_CROPPED && wallpaper_.width() > width()
+  if (wallpaper_layout_ == ash::CENTER_CROPPED && wallpaper_.width() > width()
       && wallpaper_.height() > height()) {
     // The dimension with the smallest ratio must be cropped, the other one
     // is preserved. Both are set in gfx::Size cropped_size.
     double horizontal_ratio = static_cast<double>(width()) /
         static_cast<double>(wallpaper_.width());
     double vertical_ratio = static_cast<double>(height()) /
         static_cast<double>(wallpaper_.height());
 
     gfx::Size cropped_size;
     if (vertical_ratio > horizontal_ratio) {
       cropped_size = gfx::Size(
           RoundPositive(static_cast<double>(width()) / vertical_ratio),
           wallpaper_.height());
     } else {
       cropped_size = gfx::Size(wallpaper_.width(),
           RoundPositive(static_cast<double>(height()) / horizontal_ratio));
     }
 
     gfx::Rect wallpaper_cropped_rect = wallpaper_rect.Center(cropped_size);
     canvas->DrawBitmapInt(wallpaper_,
         wallpaper_cropped_rect.x(), wallpaper_cropped_rect.y(),
         wallpaper_cropped_rect.width(), wallpaper_cropped_rect.height(),
         0, 0, width(), height(),
         true);
-  } else if (image_layout_ == ash::TILE) {
+  } else if (wallpaper_layout_ == ash::TILE) {
     canvas->TileImageInt(wallpaper_, 0, 0, width(), height());
-  } else if (image_layout_ == ash::STRETCH) {
+  } else if (wallpaper_layout_ == ash::STRETCH) {
     // This is generally not recommended as it may show artifacts.
     canvas->DrawBitmapInt(wallpaper_, 0, 0, wallpaper_.width(),
         wallpaper_.height(), 0, 0, width(), height(), true);
   } else {
     // All other are simply centered, and not scaled (but may be clipped).
      canvas->DrawBitmapInt(wallpaper_, (width() - wallpaper_.width()) / 2,
          (height() - wallpaper_.height()) / 2);
   }
 }
 
 bool DesktopBackgroundView::OnMousePressed(const views::MouseEvent& event) {
   return true;
 }
 
 void DesktopBackgroundView::OnMouseReleased(const views::MouseEvent& event) {
   if (event.IsRightMouseButton())
     Shell::GetInstance()->ShowBackgroundMenu(GetWidget(), event.location());
 }
 
-void CreateDesktopBackground(const SkBitmap& wallpaper, ImageLayout layout) {
+void CreateDesktopBackground(const SkBitmap& wallpaper,
+                             WallpaperLayout wallpaper_layout) {
   views::Widget* desktop_widget = new views::Widget;
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
-  DesktopBackgroundView* view = new DesktopBackgroundView(wallpaper, layout);
+  DesktopBackgroundView* view = new DesktopBackgroundView(wallpaper,
+                                                          wallpaper_layout);
   params.delegate = view;
   params.parent =
       Shell::GetInstance()->GetContainer(
           ash::internal::kShellWindowId_DesktopBackgroundContainer);
   desktop_widget->Init(params);
   desktop_widget->SetContentsView(view);
   ash::SetWindowVisibilityAnimationType(
       desktop_widget->GetNativeView(),
       ash::WINDOW_VISIBILITY_ANIMATION_TYPE_FADE);
   ash::SetWindowVisibilityAnimationTransition(
       desktop_widget->GetNativeView(),
       ash::ANIMATE_SHOW);
   desktop_widget->SetBounds(params.parent->bounds());
   ui::ScopedLayerAnimationSettings settings(desktop_widget->GetNativeView()->
                                             layer()->GetAnimator());
   settings.SetPreemptionStrategy(ui::LayerAnimator::ENQUEUE_NEW_ANIMATION);
   settings.AddObserver(new ShowWallpaperAnimationObserver(desktop_widget));
   desktop_widget->Show();
   desktop_widget->GetNativeView()->SetName("DesktopBackgroundView");
 }
 
 }  // namespace internal
 }  // namespace ash