Introduce FastShowPickler which will be used for app list cold start.

chrome/browser/ui/app_list/fast_show_pickler.cc

+// Copyright 2013 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/app_list/fast_show_pickler.h"
+
+namespace {
+
+using app_list::AppListItemModel;
+using app_list::AppListModel;
+
+// These have the same meaning as SkBitmap::Config. Reproduced here to insure
+// against their value changing in Skia. If the order of these changes kVersion
+// should be incremented.
+enum ImageFormat {
+  NONE,
+  A1,
+  A8,
+  INDEX_8,
+  RGB_565,
+  ARGB_4444,
+  ARGB_8888,
+};
+
+bool FormatToConfig(ImageFormat format, SkBitmap::Config* out) {
+  switch (format) {
+    case NONE:
+      *out = SkBitmap::kNo_Config;
+      break;
+    case A1:
+      *out = SkBitmap::kA1_Config;
+      break;
+    case A8:
+      *out = SkBitmap::kA8_Config;
+      break;
+    case INDEX_8:
+      *out = SkBitmap::kIndex8_Config;
+      break;
+    case RGB_565:
+      *out = SkBitmap::kRGB_565_Config;
+      break;
+    case ARGB_4444:
+      *out = SkBitmap::kARGB_4444_Config;
+      break;
+    case ARGB_8888:
+      *out = SkBitmap::kARGB_8888_Config;
+      break;
+    default: return false;
+  }
+  return true;
+}
+
+bool ConfigToFormat(SkBitmap::Config config, ImageFormat* out) {
+  switch (config) {
+    case SkBitmap::kNo_Config:
+      *out = NONE;
+      break;
+    case SkBitmap::kA1_Config:
+      *out = A1;
+      break;
+    case SkBitmap::kA8_Config:
+      *out = A8;
+      break;
+    case SkBitmap::kIndex8_Config:
+      *out = INDEX_8;
+      break;
+    case SkBitmap::kRGB_565_Config:
+      *out = RGB_565;
+      break;
+    case SkBitmap::kARGB_4444_Config:
+      *out = ARGB_4444;
+      break;
+    case SkBitmap::kARGB_8888_Config:
+      *out = ARGB_8888;
+      break;
+    default: return false;
+  }
+  return true;
+}
+
+bool PickleImage(Pickle* pickle, const gfx::ImageSkia& image) {
+  std::vector<gfx::ImageSkiaRep> reps(image.image_reps());
+  pickle->WriteInt(static_cast<int>(reps.size()));
+  for (std::vector<gfx::ImageSkiaRep>::const_iterator it = reps.begin();
+       it != reps.end(); ++it) {
+    pickle->WriteInt(static_cast<int>(it->scale_factor()));
+    pickle->WriteInt(it->pixel_width());
+    pickle->WriteInt(it->pixel_height());
+    ImageFormat format = NONE;
+    if (!ConfigToFormat(it->sk_bitmap().getConfig(), &format))
+      return false;
+    pickle->WriteInt(static_cast<int>(format));
+    int size = static_cast<int>(it->sk_bitmap().getSafeSize());
+    pickle->WriteInt(size);
+    SkBitmap bitmap = it->sk_bitmap();
+    SkAutoLockPixels lock(bitmap);
+    pickle->WriteBytes(bitmap.getPixels(), size);
+  }
+  return true;
+}
+
+bool UnpickleImage(PickleIterator* it, gfx::ImageSkia* out) {
+  int rep_count = 0;
+  if (!it->ReadInt(&rep_count))
+    return false;
+
+  gfx::ImageSkia result;
+  for (int i = 0; i < rep_count; ++i) {
+    int scale_factor = 0;
+    if (!it->ReadInt(&scale_factor))
+      return false;
+
+    int width = 0;
+    if (!it->ReadInt(&width))
+      return false;
+
+    int height = 0;
+    if (!it->ReadInt(&height))
+      return false;
+
+    int format_int = 0;
+    if (!it->ReadInt(&format_int))
+      return false;
+    ImageFormat format = static_cast<ImageFormat>(format_int);
+    SkBitmap::Config config = SkBitmap::kNo_Config;
+    if (!FormatToConfig(format, &config))
+      return false;
+
+    int size = 0;
+    if (!it->ReadInt(&size))
+      return false;
+
+    const char* pixels = NULL;
+    if (!it->ReadBytes(&pixels, size))
+      return false;
+
+    SkBitmap bitmap;
+    bitmap.setConfig(static_cast<SkBitmap::Config>(config), width, height);
+    if (!bitmap.allocPixels())
+      return false;
+    {
+      SkAutoLockPixels lock(bitmap);
+      memcpy(bitmap.getPixels(), pixels, bitmap.getSize());
+    }
+    result.AddRepresentation(
+        gfx::ImageSkiaRep(bitmap, static_cast<ui::ScaleFactor>(scale_factor)));
+  }
+
+  *out = result;
+  return true;
+}
+
+scoped_ptr<AppListItemModel> UnpickleAppListItemModel(PickleIterator* it) {
+  scoped_ptr<AppListItemModel> result(new AppListItemModel);
+  std::string id;
+  if (!it->ReadString(&id))
+    return scoped_ptr<AppListItemModel>();
+  result->set_app_id(id);
+  std::string title;
+  if (!it->ReadString(&title))
+    return scoped_ptr<AppListItemModel>();
+  result->SetTitle(title);
+  bool has_shadow = false;
+  if (!it->ReadBool(&has_shadow))
+    return scoped_ptr<AppListItemModel>();
+  gfx::ImageSkia icon;
+  if (!UnpickleImage(it, &icon))
+    return scoped_ptr<AppListItemModel>();
+  result->SetIcon(icon, has_shadow);
+  return result.Pass();
+}
+
+
+bool PickleAppListItemModel(Pickle* pickle, AppListItemModel* item) {
+  if (!pickle->WriteString(item->app_id()))
+    return false;
+  if (!pickle->WriteString(item->title()))
+    return false;
+  if (!pickle->WriteBool(item->has_shadow()))
+    return false;
+  if (!PickleImage(pickle, item->icon()))
+    return false;
+  return true;
+}
+
+void CopyOverItem(AppListItemModel* src_item, AppListItemModel* dest_item) {
+  dest_item->set_app_id(src_item->app_id());
+  dest_item->SetTitle(src_item->title());
+  dest_item->SetIcon(src_item->icon(), src_item->has_shadow());
+}
+
+}  // namespace
+
+// The version of the pickle format defined here. This needs to be incremented
+// whenever this format is changed so new clients can invalidate old versions.
+const int FastShowPickler::kVersion = 1;
+
+scoped_ptr<Pickle> FastShowPickler::PickleAppListModelForFastShow(
+    AppListModel* model) {
+  scoped_ptr<Pickle> result(new Pickle);
+  if (!result->WriteInt(kVersion))
+    return scoped_ptr<Pickle>();
+  if (!result->WriteBool(model->signed_in()))
+    return scoped_ptr<Pickle>();
+  if (!result->WriteInt((int) model->apps()->item_count()))
+    return scoped_ptr<Pickle>();
+  for (size_t i = 0; i < model->apps()->item_count(); ++i) {
+    if (!PickleAppListItemModel(result.get(), model->apps()->GetItemAt(i)))
+      return scoped_ptr<Pickle>();
+  }
+  return result.Pass();
+}
+
+void FastShowPickler::CopyOver(AppListModel* src, AppListModel* dest) {
+  dest->apps()->DeleteAll();
+  dest->SetSignedIn(src->signed_in());
+  for (size_t i = 0; i < src->apps()->item_count(); i++) {
+    AppListItemModel* src_item = src->apps()->GetItemAt(i);
+    AppListItemModel* dest_item = new AppListItemModel;
+    CopyOverItem(src_item, dest_item);
+    dest->apps()->Add(dest_item);
+  }
+}
+
+scoped_ptr<AppListModel>
+FastShowPickler::UnpickleAppListModelForFastShow(Pickle* pickle) {
+  PickleIterator it(*pickle);
+  int read_version = 0;
+  if (!it.ReadInt(&read_version))
+    return scoped_ptr<AppListModel>();
+  if (read_version != kVersion)
+    return scoped_ptr<AppListModel>();
+  int app_count = 0;
+  bool signed_in = false;
+  if (!it.ReadBool(&signed_in))
+    return scoped_ptr<AppListModel>();
+  if (!it.ReadInt(&app_count))
+    return scoped_ptr<AppListModel>();
+
+  scoped_ptr<AppListModel> model(new AppListModel);
+  model->SetSignedIn(signed_in);
+  for (int i = 0; i < app_count; ++i) {
+    scoped_ptr<AppListItemModel> item(UnpickleAppListItemModel(&it).Pass());
+    if (!item)
+      return scoped_ptr<AppListModel>();
+    model->apps()->Add(item.release());
+  }
+
+  return model.Pass();
+}