Convert extension action icons code to use ImageSkia instead of SkBitmap

chrome/browser/ui/views/browser_action_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 "chrome/browser/ui/views/browser_action_view.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/commands/command_service.h"
 #include "chrome/browser/extensions/api/commands/command_service_factory.h"
 #include "chrome/browser/extensions/extension_context_menu_model.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/views/browser_actions_container.h"
 #include "chrome/browser/ui/views/toolbar_view.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/skbitmap_operations.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/image/image_skia_operations.h"
+#include "ui/gfx/image/image_skia_source.h"
 #include "ui/views/controls/menu/menu_model_adapter.h"
 #include "ui/views/controls/menu/menu_runner.h"
 
 using extensions::Extension;
 
 namespace {
 
+// ImageSource which creates a partially transparent image mask.
+class TransparencyMaskImageSource : public gfx::ImageSkiaSource {
+ public:
+  explicit TransparencyMaskImageSource(const gfx::Size& size)
+      : width_(size.width()),
+        height_(size.height()) {
+  }
+
+  virtual ~TransparencyMaskImageSource() {}
+
+ private:
+  virtual gfx::ImageSkiaRep GetImageForScale(
+      ui::ScaleFactor scale_factor) OVERRIDE {
+    SkBitmap alpha;
+    const float scale = ui::GetScaleFactorScale(scale_factor);
+    alpha.setConfig(SkBitmap::kARGB_8888_Config,
+                    static_cast<int>(width_ * scale),
+                    static_cast<int>(height_ * scale));
+    alpha.allocPixels();
+    alpha.eraseColor(SkColorSetARGB(64, 0, 0, 0));
+    return gfx::ImageSkiaRep(alpha, scale_factor);
+  }
+
+  // Icon width in DIP.
+  const int width_;
+  // Icon height in DIP.
+  const int height_;
+
+  DISALLOW_COPY_AND_ASSIGN(TransparencyMaskImageSource);
+};
+
 // Return a more transparent |image|, with 25% of its original opacity.
-SkBitmap MakeTransparent(const SkBitmap& image) {
-  SkBitmap alpha;
-  alpha.setConfig(SkBitmap::kARGB_8888_Config, image.width(), image.height());
-  alpha.allocPixels();
-  alpha.eraseColor(SkColorSetARGB(64, 0, 0, 0));
-
-  return SkBitmapOperations::CreateMaskedBitmap(image, alpha);
+gfx::ImageSkia MakeTransparent(const gfx::ImageSkia& image) {
+  gfx::ImageSkia alpha(new TransparencyMaskImageSource(image.size()),
+                       image.size());
+  return gfx::ImageSkiaOperations::CreateMaskedImage(image, alpha);

[Jeffrey Yasskin, 2012/08/09 21:39:04]

Why do a 2-step transformation instead of directly manipulating |image| in the
ImageSource?

[tbarzic, 2012/08/10 06:24:08]

Done. moved to image_skia_operations

 }
 
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserActionButton
 
 BrowserActionButton::BrowserActionButton(const Extension* extension,
                                          BrowserActionsContainer* panel)
     : ALLOW_THIS_IN_INITIALIZER_LIST(
@@ skipping 112 matching lines @@
     return;
 
   if (!IsEnabled(tab_id)) {
     SetState(views::CustomButton::BS_DISABLED);
   } else {
     SetState(menu_visible_ ?
              views::CustomButton::BS_PUSHED :
              views::CustomButton::BS_NORMAL);
   }
 
-  SkBitmap icon(*browser_action()->GetIcon(tab_id).ToSkBitmap());
+  gfx::ImageSkia icon = *browser_action()->GetIcon(tab_id).ToImageSkia();
+
   if (!icon.isNull()) {
     if (!browser_action()->GetIsVisible(tab_id))
       icon = MakeTransparent(icon);
-    SkPaint paint;
-    paint.setXfermode(SkXfermode::Create(SkXfermode::kSrcOver_Mode));
+
     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
 
-    SkBitmap bg;
-    rb.GetBitmapNamed(IDR_BROWSER_ACTION)->copyTo(&bg,
-        SkBitmap::kARGB_8888_Config);
-    SkCanvas bg_canvas(bg);
-    bg_canvas.drawBitmap(icon, SkIntToScalar((bg.width() - icon.width()) / 2),
-        SkIntToScalar((bg.height() - icon.height()) / 2), &paint);
-    SetIcon(bg);
+    gfx::ImageSkia bg = *rb.GetImageSkiaNamed(IDR_BROWSER_ACTION);
+    SetIcon(gfx::ImageSkiaOperations::CreateSuperimposedImage(bg, icon));
 
-    SkBitmap bg_h;
-    rb.GetBitmapNamed(IDR_BROWSER_ACTION_H)->copyTo(&bg_h,
-        SkBitmap::kARGB_8888_Config);
-    SkCanvas bg_h_canvas(bg_h);
-    bg_h_canvas.drawBitmap(icon,
-        SkIntToScalar((bg_h.width() - icon.width()) / 2),
-        SkIntToScalar((bg_h.height() - icon.height()) / 2), &paint);
-    SetHoverIcon(bg_h);
+    gfx::ImageSkia bg_h = *rb.GetImageSkiaNamed(IDR_BROWSER_ACTION_H);
+    SetHoverIcon(gfx::ImageSkiaOperations::CreateSuperimposedImage(bg_h, icon));
 
-    SkBitmap bg_p;
-    rb.GetBitmapNamed(IDR_BROWSER_ACTION_P)->copyTo(&bg_p,
-        SkBitmap::kARGB_8888_Config);
-    SkCanvas bg_p_canvas(bg_p);
-    bg_p_canvas.drawBitmap(icon,
-        SkIntToScalar((bg_p.width() - icon.width()) / 2),
-        SkIntToScalar((bg_p.height() - icon.height()) / 2), &paint);
-    SetPushedIcon(bg_p);
+    gfx::ImageSkia bg_p = *rb.GetImageSkiaNamed(IDR_BROWSER_ACTION_P);
+    SetPushedIcon(
+        gfx::ImageSkiaOperations::CreateSuperimposedImage(bg_p, icon));
   }
 
   // If the browser action name is empty, show the extension name instead.
   string16 name = UTF8ToUTF16(browser_action()->GetTitle(tab_id));
   if (name.empty())
     name = UTF8ToUTF16(extension()->name());
   SetTooltipText(name);
   SetAccessibleName(name);
 
   parent()->SchedulePaint();
@@ skipping 142 matching lines @@
   extensions::Command browser_action_command;
   if (!only_if_active || !command_service->GetBrowserActionCommand(
           extension_->id(),
           extensions::CommandService::ACTIVE_ONLY,
           &browser_action_command,
           NULL)) {
     panel_->GetFocusManager()->UnregisterAccelerator(*keybinding_.get(), this);
   }
 }
 
-
 ////////////////////////////////////////////////////////////////////////////////
 // BrowserActionView
 
 BrowserActionView::BrowserActionView(const Extension* extension,
                                      BrowserActionsContainer* panel)
     : panel_(panel) {
   button_ = new BrowserActionButton(extension, panel);
   button_->set_drag_controller(panel_);
   AddChildView(button_);
   button_->UpdateState();
 }
 
 BrowserActionView::~BrowserActionView() {
   RemoveChildView(button_);
   button_->Destroy();
 }
 
-gfx::Canvas* BrowserActionView::GetIconWithBadge() {
+gfx::ImageSkia BrowserActionView::GetIconWithBadge() {
   int tab_id = panel_->GetCurrentTabId();
 
-  SkBitmap icon = *button_->extension()->browser_action()->GetIcon(
-      tab_id).ToSkBitmap();
-
-  // Dim the icon if our button is disabled.
+  const ExtensionAction* action = button_->extension()->browser_action();
+  gfx::Size spacing(0, ToolbarView::kVertSpacing);
+  gfx::ImageSkia icon = *action->GetIcon(tab_id).ToImageSkia();
   if (!button_->IsEnabled(tab_id))
     icon = MakeTransparent(icon);
-
-  gfx::Canvas* canvas =
-      new gfx::Canvas(gfx::ImageSkiaRep(icon, ui::SCALE_FACTOR_100P), false);
-
-  if (tab_id >= 0) {
-    gfx::Rect bounds(icon.width(), icon.height() + ToolbarView::kVertSpacing);
-    button_->extension()->browser_action()->PaintBadge(canvas, bounds, tab_id);
-  }
-
-  return canvas;
+  return action->GetIconWithBadge(icon, tab_id, spacing);
 }
 
 void BrowserActionView::Layout() {
   // We can't rely on button_->GetPreferredSize() here because that's not set
   // correctly until the first call to
   // BrowserActionsContainer::RefreshBrowserActionViews(), whereas this can be
   // called before that when the initial bounds are set (and then not after,
   // since the bounds don't change).  So instead of setting the height from the
   // button's preferred size, we use IconHeight(), since that's how big the
   // button should be regardless of what it's displaying.
   button_->SetBounds(0, ToolbarView::kVertSpacing, width(),
                      BrowserActionsContainer::IconHeight());
 }
 
 void BrowserActionView::GetAccessibleState(ui::AccessibleViewState* state) {
   state->name = l10n_util::GetStringUTF16(
       IDS_ACCNAME_EXTENSIONS_BROWSER_ACTION);
   state->role = ui::AccessibilityTypes::ROLE_GROUPING;
 }
 
 void BrowserActionView::PaintChildren(gfx::Canvas* canvas) {
   View::PaintChildren(canvas);
   ExtensionAction* action = button()->browser_action();
   int tab_id = panel_->GetCurrentTabId();
   if (tab_id >= 0)
     action->PaintBadge(canvas, gfx::Rect(width(), height()), tab_id);
 }