Add appIconMask to notification API

ui/message_center/views/message_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 "ui/message_center/views/message_view.h"
 
 #include "grit/ui_resources.h"
 #include "grit/ui_strings.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image_skia_operations.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/padded_button.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/scroll_view.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/painter.h"
 #include "ui/views/shadow_border.h"
 
 namespace {
 
 const int kCloseIconTopPadding = 5;
 const int kCloseIconRightPadding = 5;
 
 const int kShadowOffset = 1;
 const int kShadowBlur = 4;
 
+const gfx::ImageSkia CreateImage(int width, int height, SkColor color) {
+  SkBitmap bitmap;
+  bitmap.allocN32Pixels(width, height);
+  bitmap.eraseColor(color);
+  return gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
+}
+
+// Take the alpha channel of small_image, mask it with the foreground,
+// then add the masked foreground on top of the background
+const gfx::ImageSkia GetMaskedSmallImage(const gfx::ImageSkia& small_image) {
+  int width = small_image.width();
+  int height = small_image.height();
+
+  // Background color grey
+  const gfx::ImageSkia background = CreateImage(
+      width, height, message_center::kSmallImageMaskBackgroundColor);
+  // Foreground color white
+  const gfx::ImageSkia foreground = CreateImage(
+      width, height, message_center::kSmallImageMaskForegroundColor);
+  const gfx::ImageSkia masked_small_image =
+      gfx::ImageSkiaOperations::CreateMaskedImage(foreground, small_image);
+  return gfx::ImageSkiaOperations::CreateSuperimposedImage(background,
+                                                           masked_small_image);
+}
+
 }  // namespace
 
 namespace message_center {
 
 MessageView::MessageView(MessageViewController* controller,
                          const std::string& notification_id,
                          const NotifierId& notifier_id,
                          const gfx::ImageSkia& small_image,
                          const base::string16& display_source)
     : controller_(controller),
       notification_id_(notification_id),
       notifier_id_(notifier_id),
       background_view_(NULL),
       scroller_(NULL),
       display_source_(display_source) {
   SetFocusable(true);
 
   // Create the opaque background that's above the view's shadow.
   background_view_ = new views::View();
   background_view_->set_background(
       views::Background::CreateSolidBackground(kNotificationBackgroundColor));
   AddChildView(background_view_);
 
+  const gfx::ImageSkia masked_small_image = GetMaskedSmallImage(small_image);
   views::ImageView* small_image_view = new views::ImageView();
-  small_image_view->SetImage(small_image);
+  small_image_view->SetImage(masked_small_image);
   small_image_view->SetImageSize(gfx::Size(kSmallImageSize, kSmallImageSize));
   // The small image view should be added to view hierarchy by the derived
   // class. This ensures that it is on top of other views.
   small_image_view->set_owned_by_client();
   small_image_view_.reset(small_image_view);
 
   PaddedButton *close = new PaddedButton(this);
   close->SetPadding(-kCloseIconRightPadding, kCloseIconTopPadding);
   close->SetNormalImage(IDR_NOTIFICATION_CLOSE);
   close->SetHoveredImage(IDR_NOTIFICATION_CLOSE_HOVER);
   close->SetPressedImage(IDR_NOTIFICATION_CLOSE_PRESSED);
   close->set_animate_on_state_change(false);
   close->SetAccessibleName(l10n_util::GetStringUTF16(
       IDS_MESSAGE_CENTER_CLOSE_NOTIFICATION_BUTTON_ACCESSIBLE_NAME));
   // The close button should be added to view hierarchy by the derived class.
   // This ensures that it is on top of other views.
   close->set_owned_by_client();
   close_button_.reset(close);
 
   focus_painter_ = views::Painter::CreateSolidFocusPainter(
       kFocusBorderColor,
       gfx::Insets(0, 1, 3, 2)).Pass();
 }
 
 MessageView::~MessageView() {
 }
 
 void MessageView::UpdateWithNotification(const Notification& notification) {
-  small_image_view_->SetImage(notification.small_image().AsImageSkia());
+  const gfx::ImageSkia masked_small_image =
+      GetMaskedSmallImage(notification.small_image().AsImageSkia());
+  small_image_view_->SetImage(masked_small_image);
   display_source_ = notification.display_source();
 }
 
 // static
 gfx::Insets MessageView::GetShadowInsets() {
   return gfx::Insets(kShadowBlur / 2 - kShadowOffset,
                      kShadowBlur / 2,
                      kShadowBlur / 2 + kShadowOffset,
                      kShadowBlur / 2);
 }
@@ skipping 121 matching lines @@
   if (sender == close_button()) {
     controller_->RemoveNotification(notification_id_, true);  // By user.
   }
 }
 
 void MessageView::OnSlideOut() {
   controller_->RemoveNotification(notification_id_, true);  // By user.
 }
 
 }  // namespace message_center