chrome/browser/ui/app_list/fast_show_pickler.cc

   1 // Copyright 2013 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/ui/app_list/fast_show_pickler.h"
   6
   7 #include "third_party/skia/include/core/SkBitmap.h"
   8 #include "ui/app_list/app_list_item.h"
   9 #include "ui/gfx/image/image_skia_rep.h"
  10
  11 namespace {
  12
  13 using app_list::AppListItem;
  14 using app_list::AppListModel;
  15
  16 // These have the same meaning as SkBitmap::Config. Reproduced here to insure
  17 // against their value changing in Skia. If the order of these changes kVersion
  18 // should be incremented.
  19 enum ImageFormat {
  20   NONE,
  21   A8,
  22   INDEX_8,
  23   RGB_565,
  24   ARGB_4444,
  25   ARGB_8888,
  26 };
  27
  28 bool FormatToConfig(ImageFormat format, SkBitmap::Config* out) {
  29   switch (format) {
  30     case NONE:
  31       *out = SkBitmap::kNo_Config;
  32       break;
  33     case A8:
  34       *out = SkBitmap::kA8_Config;
  35       break;
  36     case INDEX_8:
  37       *out = SkBitmap::kIndex8_Config;
  38       break;
  39     case RGB_565:
  40       *out = SkBitmap::kRGB_565_Config;
  41       break;
  42     case ARGB_4444:
  43       *out = SkBitmap::kARGB_4444_Config;
  44       break;
  45     case ARGB_8888:
  46       *out = SkBitmap::kARGB_8888_Config;
  47       break;
  48     default: return false;
  49   }
  50   return true;
  51 }
  52
  53 bool ConfigToFormat(SkBitmap::Config config, ImageFormat* out) {
  54   switch (config) {
  55     case SkBitmap::kNo_Config:
  56       *out = NONE;
  57       break;
  58     case SkBitmap::kA8_Config:
  59       *out = A8;
  60       break;
  61     case SkBitmap::kIndex8_Config:
  62       *out = INDEX_8;
  63       break;
  64     case SkBitmap::kRGB_565_Config:
  65       *out = RGB_565;
  66       break;
  67     case SkBitmap::kARGB_4444_Config:
  68       *out = ARGB_4444;
  69       break;
  70     case SkBitmap::kARGB_8888_Config:
  71       *out = ARGB_8888;
  72       break;
  73     default: return false;
  74   }
  75   return true;
  76 }
  77
  78 bool PickleImage(Pickle* pickle, const gfx::ImageSkia& image) {
  79   std::vector<gfx::ImageSkiaRep> reps(image.image_reps());
  80   pickle->WriteInt(static_cast<int>(reps.size()));
  81   for (std::vector<gfx::ImageSkiaRep>::const_iterator it = reps.begin();
  82        it != reps.end(); ++it) {
  83     pickle->WriteFloat(it->scale());
  84     pickle->WriteInt(it->pixel_width());
  85     pickle->WriteInt(it->pixel_height());
  86     ImageFormat format = NONE;
  87     if (!ConfigToFormat(it->sk_bitmap().getConfig(), &format))
  88       return false;
  89     pickle->WriteInt(static_cast<int>(format));
  90     int size = static_cast<int>(it->sk_bitmap().getSafeSize());
  91     pickle->WriteInt(size);
  92     SkBitmap bitmap = it->sk_bitmap();
  93     SkAutoLockPixels lock(bitmap);
  94     pickle->WriteBytes(bitmap.getPixels(), size);
  95   }
  96   return true;
  97 }
  98
  99 bool UnpickleImage(PickleIterator* it, gfx::ImageSkia* out) {
 100   int rep_count = 0;
 101   if (!it->ReadInt(&rep_count))
 102     return false;
 103
 104   gfx::ImageSkia result;
 105   for (int i = 0; i < rep_count; ++i) {
 106     float scale = 0.0f;
 107     if (!it->ReadFloat(&scale))
 108       return false;
 109
 110     int width = 0;
 111     if (!it->ReadInt(&width))
 112       return false;
 113
 114     int height = 0;
 115     if (!it->ReadInt(&height))
 116       return false;
 117
 118     int format_int = 0;
 119     if (!it->ReadInt(&format_int))
 120       return false;
 121     ImageFormat format = static_cast<ImageFormat>(format_int);
 122     SkBitmap::Config config = SkBitmap::kNo_Config;
 123     if (!FormatToConfig(format, &config))
 124       return false;
 125
 126     int size = 0;
 127     if (!it->ReadInt(&size))
 128       return false;
 129
 130     const char* pixels = NULL;
 131     if (!it->ReadBytes(&pixels, size))
 132       return false;
 133
 134     SkBitmap bitmap;
 135     bitmap.setConfig(static_cast<SkBitmap::Config>(config), width, height);
 136     if (!bitmap.allocPixels())
 137       return false;
 138     {
 139       SkAutoLockPixels lock(bitmap);
 140       memcpy(bitmap.getPixels(), pixels, bitmap.getSize());
 141     }
 142     result.AddRepresentation(gfx::ImageSkiaRep(bitmap, scale));
 143   }
 144
 145   *out = result;
 146   return true;
 147 }
 148
 149 scoped_ptr<AppListItem> UnpickleAppListItem(PickleIterator* it) {
 150   std::string id;
 151   if (!it->ReadString(&id))
 152     return scoped_ptr<AppListItem>();
 153   scoped_ptr<AppListItem> result(new AppListItem(id));
 154   std::string title;
 155   if (!it->ReadString(&title))
 156     return scoped_ptr<AppListItem>();
 157   std::string full_name;
 158   if (!it->ReadString(&full_name))
 159     return scoped_ptr<AppListItem>();
 160   result->SetTitleAndFullName(title, full_name);
 161   bool has_shadow = false;
 162   if (!it->ReadBool(&has_shadow))
 163     return scoped_ptr<AppListItem>();
 164   gfx::ImageSkia icon;
 165   if (!UnpickleImage(it, &icon))
 166     return scoped_ptr<AppListItem>();
 167   result->SetIcon(icon, has_shadow);
 168   return result.Pass();
 169 }
 170
 171 bool PickleAppListItem(Pickle* pickle, AppListItem* item) {
 172   if (!pickle->WriteString(item->id()))
 173     return false;
 174   if (!pickle->WriteString(item->title()))
 175     return false;
 176   if (!pickle->WriteString(item->full_name()))
 177     return false;
 178   if (!pickle->WriteBool(item->has_shadow()))
 179     return false;
 180   if (!PickleImage(pickle, item->icon()))
 181     return false;
 182   return true;
 183 }
 184
 185 void CopyOverItem(AppListItem* src_item, AppListItem* dest_item) {
 186   dest_item->SetTitleAndFullName(src_item->title(), src_item->full_name());
 187   dest_item->SetIcon(src_item->icon(), src_item->has_shadow());
 188 }
 189
 190 }  // namespace
 191
 192 // The version of the pickle format defined here. This needs to be incremented
 193 // whenever this format is changed so new clients can invalidate old versions.
 194 const int FastShowPickler::kVersion = 3;
 195
 196 scoped_ptr<Pickle> FastShowPickler::PickleAppListModelForFastShow(
 197     AppListModel* model) {
 198   scoped_ptr<Pickle> result(new Pickle);
 199   if (!result->WriteInt(kVersion))
 200     return scoped_ptr<Pickle>();
 201   if (!result->WriteInt((int) model->item_list()->item_count()))
 202     return scoped_ptr<Pickle>();
 203   for (size_t i = 0; i < model->item_list()->item_count(); ++i) {
 204     if (!PickleAppListItem(result.get(), model->item_list()->item_at(i)))
 205       return scoped_ptr<Pickle>();
 206   }
 207   return result.Pass();
 208 }
 209
 210 void FastShowPickler::CopyOver(AppListModel* src, AppListModel* dest) {
 211   dest->item_list()->DeleteItemsByType(NULL /* all items */);
 212   for (size_t i = 0; i < src->item_list()->item_count(); i++) {
 213     AppListItem* src_item = src->item_list()->item_at(i);
 214     AppListItem* dest_item = new AppListItem(src_item->id());
 215     CopyOverItem(src_item, dest_item);
 216     dest->item_list()->AddItem(dest_item);
 217   }
 218 }
 219
 220 scoped_ptr<AppListModel>
 221 FastShowPickler::UnpickleAppListModelForFastShow(Pickle* pickle) {
 222   PickleIterator it(*pickle);
 223   int read_version = 0;
 224   if (!it.ReadInt(&read_version))
 225     return scoped_ptr<AppListModel>();
 226   if (read_version != kVersion)
 227     return scoped_ptr<AppListModel>();
 228   int app_count = 0;
 229   if (!it.ReadInt(&app_count))
 230     return scoped_ptr<AppListModel>();
 231
 232   scoped_ptr<AppListModel> model(new AppListModel);
 233   for (int i = 0; i < app_count; ++i) {
 234     scoped_ptr<AppListItem> item(UnpickleAppListItem(&it).Pass());
 235     if (!item)
 236       return scoped_ptr<AppListModel>();
 237     model->item_list()->AddItem(item.release());
 238   }
 239
 240   return model.Pass();
 241 }