src/chrome/browser/extensions/extension_icon_manager.cc

   1 // Copyright (c) 2012 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 "chrome/browser/extensions/extension_icon_manager.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "base/stl_util.h"
  10 #include "chrome/browser/extensions/image_loader.h"
  11 #include "extensions/common/constants.h"
  12 #include "extensions/common/extension.h"
  13 #include "extensions/common/extension_icon_set.h"
  14 #include "extensions/common/extension_resource.h"
  15 #include "extensions/common/manifest_handlers/icons_handler.h"
  16 #include "grit/theme_resources.h"
  17 #include "skia/ext/image_operations.h"
  18 #include "ui/base/resource/resource_bundle.h"
  19 #include "ui/gfx/canvas.h"
  20 #include "ui/gfx/color_utils.h"
  21 #include "ui/gfx/favicon_size.h"
  22 #include "ui/gfx/image/image.h"
  23 #include "ui/gfx/size.h"
  24 #include "ui/gfx/skbitmap_operations.h"
  25
  26 namespace {
  27
  28 // Helper function to create a new bitmap with |padding| amount of empty space
  29 // around the original bitmap.
  30 static SkBitmap ApplyPadding(const SkBitmap& source,
  31                              const gfx::Insets& padding) {
  32   scoped_ptr<gfx::Canvas> result(
  33       new gfx::Canvas(gfx::Size(source.width() + padding.width(),
  34                                 source.height() + padding.height()),
  35                       1.0f,
  36                       false));
  37   result->DrawImageInt(
  38       gfx::ImageSkia::CreateFrom1xBitmap(source),
  39       0, 0, source.width(), source.height(),
  40       padding.left(), padding.top(), source.width(), source.height(),
  41       false);
  42   return result->ExtractImageRep().sk_bitmap();
  43 }
  44
  45 }  // namespace
  46
  47 ExtensionIconManager::ExtensionIconManager()
  48     : monochrome_(false),
  49       weak_ptr_factory_(this)  {
  50 }
  51
  52 ExtensionIconManager::~ExtensionIconManager() {
  53 }
  54
  55 void ExtensionIconManager::LoadIcon(content::BrowserContext* context,
  56                                     const extensions::Extension* extension) {
  57   extensions::ExtensionResource icon_resource =
  58       extensions::IconsInfo::GetIconResource(
  59           extension,
  60           extension_misc::EXTENSION_ICON_BITTY,
  61           ExtensionIconSet::MATCH_BIGGER);
  62   if (!icon_resource.extension_root().empty()) {
  63     // Insert into pending_icons_ first because LoadImage can call us back
  64     // synchronously if the image is already cached.
  65     pending_icons_.insert(extension->id());
  66     extensions::ImageLoader* loader = extensions::ImageLoader::Get(context);
  67     loader->LoadImageAsync(extension, icon_resource,
  68                            gfx::Size(gfx::kFaviconSize, gfx::kFaviconSize),
  69                            base::Bind(
  70                                &ExtensionIconManager::OnImageLoaded,
  71                                weak_ptr_factory_.GetWeakPtr(),
  72                                extension->id()));
  73   }
  74 }
  75
  76 const SkBitmap& ExtensionIconManager::GetIcon(const std::string& extension_id) {
  77   const SkBitmap* result = NULL;
  78   if (ContainsKey(icons_, extension_id)) {
  79     result = &icons_[extension_id];
  80   } else {
  81     EnsureDefaultIcon();
  82     result = &default_icon_;
  83   }
  84   DCHECK(result);
  85   DCHECK_EQ(gfx::kFaviconSize + padding_.width(), result->width());
  86   DCHECK_EQ(gfx::kFaviconSize + padding_.height(), result->height());
  87   return *result;
  88 }
  89
  90 void ExtensionIconManager::RemoveIcon(const std::string& extension_id) {
  91   icons_.erase(extension_id);
  92   pending_icons_.erase(extension_id);
  93 }
  94
  95 void ExtensionIconManager::OnImageLoaded(const std::string& extension_id,
  96                                          const gfx::Image& image) {
  97   if (image.IsEmpty())
  98     return;
  99
 100   // We may have removed the icon while waiting for it to load. In that case,
 101   // do nothing.
 102   if (!ContainsKey(pending_icons_, extension_id))
 103     return;
 104
 105   pending_icons_.erase(extension_id);
 106   icons_[extension_id] = ApplyTransforms(*image.ToSkBitmap());
 107 }
 108
 109 void ExtensionIconManager::EnsureDefaultIcon() {
 110   if (default_icon_.empty()) {
 111     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
 112     SkBitmap src = rb.GetImageNamed(IDR_EXTENSIONS_SECTION).AsBitmap();
 113     default_icon_ = ApplyTransforms(src);
 114   }
 115 }
 116
 117 SkBitmap ExtensionIconManager::ApplyTransforms(const SkBitmap& source) {
 118   SkBitmap result = source;
 119
 120   if (result.width() != gfx::kFaviconSize ||
 121       result.height() != gfx::kFaviconSize) {
 122     result = skia::ImageOperations::Resize(
 123         result, skia::ImageOperations::RESIZE_LANCZOS3,
 124         gfx::kFaviconSize, gfx::kFaviconSize);
 125   }
 126
 127   if (monochrome_) {
 128     color_utils::HSL shift = {-1, 0, 0.6};
 129     result = SkBitmapOperations::CreateHSLShiftedBitmap(result, shift);
 130   }
 131
 132   if (!padding_.empty())
 133     result = ApplyPadding(result, padding_);
 134
 135   return result;
 136 }