ui/base/resource/resource

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
InitDefaultFontList
resource_id_
ResourceBundleImageSource
GetImageForScale
InitSharedInstanceWithLocale
InitSharedInstanceLocaleOnly
InitSharedInstanceWithPakFile
InitSharedInstanceWithPakPath
CleanupSharedInstance
HasSharedInstance
GetSharedInstance
LocaleDataPakExists
AddDataPackFromPath
AddOptionalDataPackFromPath
AddDataPackFromFile
GetLocaleFilePath
LoadLocaleResources
LoadTestResources
UnloadLocaleResources
OverrideLocalePakForTest
GetOverriddenPakPath
ReloadLocaleResources
GetImageSkiaNamed
GetImageNamed
GetNativeImageNamed
LoadDataResourceBytes
LoadDataResourceBytesForScale
GetRawDataResource
GetRawDataResourceForScale
GetLocalizedString
GetFontList
GetFont
ReloadFonts
GetMaxScaleFactor
max_scale_factor_
InitSharedInstance
FreeImages
AddDataPackFromPathInternal
AddDataPack
LoadFontsIfNecessary
GetFontListFromDelegate
LoadBitmap
LoadBitmap
GetEmptyImage
ShouldHighlightMissingScaledResources
PNGContainsFallbackMarker
DecodePNG
PlatformScaleImage
// 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/base/resource/resource_bundle.h"

#include <vector>

#include "base/big_endian.h"
#include "base/command_line.h"
#include "base/file_util.h"
#include "base/files/file.h"
#include "base/logging.h"
#include "base/memory/ref_counted_memory.h"
#include "base/metrics/histogram.h"
#include "base/path_service.h"
#include "base/stl_util.h"
#include "base/strings/string_piece.h"
#include "base/strings/utf_string_conversions.h"
#include "base/synchronization/lock.h"
#include "build/build_config.h"
#include "grit/app_locale_settings.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/layout.h"
#include "ui/base/resource/data_pack.h"
#include "ui/base/ui_base_paths.h"
#include "ui/base/ui_base_switches.h"
#include "ui/gfx/codec/jpeg_codec.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_source.h"
#include "ui/gfx/safe_integer_conversions.h"
#include "ui/gfx/screen.h"
#include "ui/gfx/size_conversions.h"
#include "ui/gfx/skbitmap_operations.h"

#if defined(OS_CHROMEOS)
#include "ui/base/l10n/l10n_util.h"
#include "ui/gfx/platform_font_pango.h"
#endif

#if defined(OS_WIN)
#include "ui/base/win/dpi_setup.h"
#include "ui/gfx/win/dpi.h"
#endif

#if defined(OS_MACOSX) && !defined(OS_IOS)
#include "base/mac/mac_util.h"
#endif

namespace ui {

namespace {

// Font sizes relative to base font.
const int kSmallFontSizeDelta = -1;
const int kMediumFontSizeDelta = 3;
const int kLargeFontSizeDelta = 8;

// PNG-related constants.
const unsigned char kPngMagic[8] = { 0x89, 'P', 'N', 'G', 13, 10, 26, 10 };
const size_t kPngChunkMetadataSize = 12;  // length, type, crc32
const unsigned char kPngScaleChunkType[4] = { 'c', 's', 'C', 'l' };
const unsigned char kPngDataChunkType[4] = { 'I', 'D', 'A', 'T' };

ResourceBundle* g_shared_instance_ = NULL;

void InitDefaultFontList() {
#if defined(OS_CHROMEOS)
  ResourceBundle& rb = ResourceBundle::GetSharedInstance();
  std::string font_family = base::UTF16ToUTF8(
      rb.GetLocalizedString(IDS_UI_FONT_FAMILY_CROS));
  gfx::FontList::SetDefaultFontDescription(font_family);

  // TODO(yukishiino): Remove SetDefaultFontDescription() once the migration to
  // the font list is done.  We will no longer need SetDefaultFontDescription()
  // after every client gets started using a FontList instead of a Font.
  gfx::PlatformFontPango::SetDefaultFontDescription(font_family);
#else
  // Use a single default font as the default font list.
  gfx::FontList::SetDefaultFontDescription(std::string());
#endif
}

}  // namespace

// An ImageSkiaSource that loads bitmaps for the requested scale factor from
// ResourceBundle on demand for a given |resource_id|. If the bitmap for the
// requested scale factor does not exist, it will return the 1x bitmap scaled
// by the scale factor. This may lead to broken UI if the correct size of the
// scaled image is not exactly |scale_factor| * the size of the 1x resource.
// When --highlight-missing-scaled-resources flag is specified, scaled 1x images
// are higlighted by blending them with red.
class ResourceBundle::ResourceBundleImageSource : public gfx::ImageSkiaSource {
 public:
  ResourceBundleImageSource(ResourceBundle* rb, int resource_id)
      : rb_(rb), resource_id_(resource_id) {}
  virtual ~ResourceBundleImageSource() {}

  // gfx::ImageSkiaSource overrides:
  virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
    SkBitmap image;
    bool fell_back_to_1x = false;
    ScaleFactor scale_factor = GetSupportedScaleFactor(scale);
    bool found = rb_->LoadBitmap(resource_id_, &scale_factor,
                                 &image, &fell_back_to_1x);
    if (!found)
      return gfx::ImageSkiaRep();

    if (fell_back_to_1x) {
      // GRIT fell back to the 100% image, so rescale it to the correct size.
      image = skia::ImageOperations::Resize(
          image,
          skia::ImageOperations::RESIZE_LANCZOS3,
          gfx::ToCeiledInt(image.width() * scale),
          gfx::ToCeiledInt(image.height() * scale));
      // If --highlight-missing-scaled-resources is specified, log the resource
      // id and blend the created resource with red.
      if (ShouldHighlightMissingScaledResources()) {
        LOG(ERROR) << "Missing " << scale << "x scaled resource. id="
                   << resource_id_;

        SkBitmap mask;
        mask.setConfig(SkBitmap::kARGB_8888_Config,
                       image.width(), image.height());
        mask.allocPixels();
        mask.eraseColor(SK_ColorRED);
        image = SkBitmapOperations::CreateBlendedBitmap(image, mask, 0.2);
      }
    } else {
      image = PlatformScaleImage(image,
                                 ui::GetScaleForScaleFactor(scale_factor),
                                 scale);
    }
    return gfx::ImageSkiaRep(image, scale);
  }

 private:
  ResourceBundle* rb_;
  const int resource_id_;

  DISALLOW_COPY_AND_ASSIGN(ResourceBundleImageSource);
};

// static
std::string ResourceBundle::InitSharedInstanceWithLocale(
    const std::string& pref_locale, Delegate* delegate) {
  InitSharedInstance(delegate);
  g_shared_instance_->LoadCommonResources();
  std::string result = g_shared_instance_->LoadLocaleResources(pref_locale);
  InitDefaultFontList();
  return result;
}

// static
std::string ResourceBundle::InitSharedInstanceLocaleOnly(
    const std::string& pref_locale, Delegate* delegate) {
  InitSharedInstance(delegate);
  std::string result = g_shared_instance_->LoadLocaleResources(pref_locale);
  InitDefaultFontList();
  return result;
}

// static
void ResourceBundle::InitSharedInstanceWithPakFile(
    base::File pak_file, bool should_load_common_resources) {
  InitSharedInstance(NULL);
  if (should_load_common_resources)
    g_shared_instance_->LoadCommonResources();

  scoped_ptr<DataPack> data_pack(
      new DataPack(SCALE_FACTOR_100P));
  if (!data_pack->LoadFromFile(pak_file.Pass())) {
    NOTREACHED() << "failed to load pak file";
    return;
  }
  g_shared_instance_->locale_resources_data_.reset(data_pack.release());
  InitDefaultFontList();
}

// static
void ResourceBundle::InitSharedInstanceWithPakPath(const base::FilePath& path) {
  InitSharedInstance(NULL);
  g_shared_instance_->LoadTestResources(path, path);

  InitDefaultFontList();
}

// static
void ResourceBundle::CleanupSharedInstance() {
  if (g_shared_instance_) {
    delete g_shared_instance_;
    g_shared_instance_ = NULL;
  }
}

// static
bool ResourceBundle::HasSharedInstance() {
  return g_shared_instance_ != NULL;
}

// static
ResourceBundle& ResourceBundle::GetSharedInstance() {
  // Must call InitSharedInstance before this function.
  CHECK(g_shared_instance_ != NULL);
  return *g_shared_instance_;
}

bool ResourceBundle::LocaleDataPakExists(const std::string& locale) {
  return !GetLocaleFilePath(locale, true).empty();
}

void ResourceBundle::AddDataPackFromPath(const base::FilePath& path,
                                         ScaleFactor scale_factor) {
  AddDataPackFromPathInternal(path, scale_factor, false);
}

void ResourceBundle::AddOptionalDataPackFromPath(const base::FilePath& path,
                                         ScaleFactor scale_factor) {
  AddDataPackFromPathInternal(path, scale_factor, true);
}

void ResourceBundle::AddDataPackFromFile(base::File file,
                                         ScaleFactor scale_factor) {
  scoped_ptr<DataPack> data_pack(
      new DataPack(scale_factor));
  if (data_pack->LoadFromFile(file.Pass())) {
    AddDataPack(data_pack.release());
  } else {
    LOG(ERROR) << "Failed to load data pack from file."
               << "\nSome features may not be available.";
  }
}

#if !defined(OS_MACOSX)
base::FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
                                                 bool test_file_exists) {
  if (app_locale.empty())
    return base::FilePath();

  base::FilePath locale_file_path;

  PathService::Get(ui::DIR_LOCALES, &locale_file_path);

  if (!locale_file_path.empty())
    locale_file_path = locale_file_path.AppendASCII(app_locale + ".pak");

  if (delegate_) {
    locale_file_path =
        delegate_->GetPathForLocalePack(locale_file_path, app_locale);
  }

  // Don't try to load empty values or values that are not absolute paths.
  if (locale_file_path.empty() || !locale_file_path.IsAbsolute())
    return base::FilePath();

  if (test_file_exists && !base::PathExists(locale_file_path))
    return base::FilePath();

  return locale_file_path;
}
#endif

std::string ResourceBundle::LoadLocaleResources(
    const std::string& pref_locale) {
  DCHECK(!locale_resources_data_.get()) << "locale.pak already loaded";
  std::string app_locale = l10n_util::GetApplicationLocale(pref_locale);
  base::FilePath locale_file_path = GetOverriddenPakPath();
  if (locale_file_path.empty()) {
    CommandLine* command_line = CommandLine::ForCurrentProcess();
    if (command_line->HasSwitch(switches::kLocalePak)) {
      locale_file_path =
          command_line->GetSwitchValuePath(switches::kLocalePak);
    } else {
      locale_file_path = GetLocaleFilePath(app_locale, true);
    }
  }

  if (locale_file_path.empty()) {
    // It's possible that there is no locale.pak.
    LOG(WARNING) << "locale_file_path.empty()";
    return std::string();
  }

  scoped_ptr<DataPack> data_pack(
      new DataPack(SCALE_FACTOR_100P));
  if (!data_pack->LoadFromPath(locale_file_path)) {
    UMA_HISTOGRAM_ENUMERATION("ResourceBundle.LoadLocaleResourcesError",
                              logging::GetLastSystemErrorCode(), 16000);
    LOG(ERROR) << "failed to load locale.pak";
    NOTREACHED();
    return std::string();
  }

  locale_resources_data_.reset(data_pack.release());
  return app_locale;
}

void ResourceBundle::LoadTestResources(const base::FilePath& path,
                                       const base::FilePath& locale_path) {
  // Use the given resource pak for both common and localized resources.
  scoped_ptr<DataPack> data_pack(new DataPack(SCALE_FACTOR_100P));
  if (!path.empty() && data_pack->LoadFromPath(path))
    AddDataPack(data_pack.release());

  data_pack.reset(new DataPack(ui::SCALE_FACTOR_NONE));
  if (!locale_path.empty() && data_pack->LoadFromPath(locale_path)) {
    locale_resources_data_.reset(data_pack.release());
  } else {
    locale_resources_data_.reset(new DataPack(ui::SCALE_FACTOR_NONE));
  }
}

void ResourceBundle::UnloadLocaleResources() {
  locale_resources_data_.reset();
}

void ResourceBundle::OverrideLocalePakForTest(const base::FilePath& pak_path) {
  overridden_pak_path_ = pak_path;
}

const base::FilePath& ResourceBundle::GetOverriddenPakPath() {
  return overridden_pak_path_;
}

std::string ResourceBundle::ReloadLocaleResources(
    const std::string& pref_locale) {
  base::AutoLock lock_scope(*locale_resources_data_lock_);
  UnloadLocaleResources();
  return LoadLocaleResources(pref_locale);
}

gfx::ImageSkia* ResourceBundle::GetImageSkiaNamed(int resource_id) {
  const gfx::ImageSkia* image = GetImageNamed(resource_id).ToImageSkia();
  return const_cast<gfx::ImageSkia*>(image);
}

gfx::Image& ResourceBundle::GetImageNamed(int resource_id) {
  // Check to see if the image is already in the cache.
  {
    base::AutoLock lock_scope(*images_and_fonts_lock_);
    if (images_.count(resource_id))
      return images_[resource_id];
  }

  gfx::Image image;
  if (delegate_)
    image = delegate_->GetImageNamed(resource_id);

  if (image.IsEmpty()) {
    DCHECK(!data_packs_.empty()) <<
        "Missing call to SetResourcesDataDLL?";

#if defined(OS_CHROMEOS) || defined(OS_WIN)
  ui::ScaleFactor scale_factor_to_load = GetMaxScaleFactor();
#else
  ui::ScaleFactor scale_factor_to_load = ui::SCALE_FACTOR_100P;
#endif

    float scale = GetImageScale(scale_factor_to_load);

    // TODO(oshima): Consider reading the image size from png IHDR chunk and
    // skip decoding here and remove #ifdef below.
    // ResourceBundle::GetSharedInstance() is destroyed after the
    // BrowserMainLoop has finished running. |image_skia| is guaranteed to be
    // destroyed before the resource bundle is destroyed.
    gfx::ImageSkia image_skia(new ResourceBundleImageSource(this, resource_id),
                              scale);
    if (image_skia.isNull()) {
      LOG(WARNING) << "Unable to load image with id " << resource_id;
      NOTREACHED();  // Want to assert in debug mode.
      // The load failed to retrieve the image; show a debugging red square.
      return GetEmptyImage();
    }
    image_skia.SetReadOnly();
    image = gfx::Image(image_skia);
  }

  // The load was successful, so cache the image.
  base::AutoLock lock_scope(*images_and_fonts_lock_);

  // Another thread raced the load and has already cached the image.
  if (images_.count(resource_id))
    return images_[resource_id];

  images_[resource_id] = image;
  return images_[resource_id];
}

gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id) {
  return GetNativeImageNamed(resource_id, RTL_DISABLED);
}

base::RefCountedStaticMemory* ResourceBundle::LoadDataResourceBytes(
    int resource_id) const {
  return LoadDataResourceBytesForScale(resource_id, ui::SCALE_FACTOR_NONE);
}

base::RefCountedStaticMemory* ResourceBundle::LoadDataResourceBytesForScale(
    int resource_id,
    ScaleFactor scale_factor) const {
  base::RefCountedStaticMemory* bytes = NULL;
  if (delegate_)
    bytes = delegate_->LoadDataResourceBytes(resource_id, scale_factor);

  if (!bytes) {
    base::StringPiece data =
        GetRawDataResourceForScale(resource_id, scale_factor);
    if (!data.empty()) {
      bytes = new base::RefCountedStaticMemory(data.data(), data.length());
    }
  }

  return bytes;
}

base::StringPiece ResourceBundle::GetRawDataResource(int resource_id) const {
  return GetRawDataResourceForScale(resource_id, ui::SCALE_FACTOR_NONE);
}

base::StringPiece ResourceBundle::GetRawDataResourceForScale(
    int resource_id,
    ScaleFactor scale_factor) const {
  base::StringPiece data;
  if (delegate_ &&
      delegate_->GetRawDataResource(resource_id, scale_factor, &data))
    return data;

  if (scale_factor != ui::SCALE_FACTOR_100P) {
    for (size_t i = 0; i < data_packs_.size(); i++) {
      if (data_packs_[i]->GetScaleFactor() == scale_factor &&
          data_packs_[i]->GetStringPiece(resource_id, &data))
        return data;
    }
  }
  for (size_t i = 0; i < data_packs_.size(); i++) {
    if ((data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_100P ||
         data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_200P ||
         data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE) &&
        data_packs_[i]->GetStringPiece(resource_id, &data))
      return data;
  }

  return base::StringPiece();
}

base::string16 ResourceBundle::GetLocalizedString(int message_id) {
  base::string16 string;
  if (delegate_ && delegate_->GetLocalizedString(message_id, &string))
    return string;

  // Ensure that ReloadLocaleResources() doesn't drop the resources while
  // we're using them.
  base::AutoLock lock_scope(*locale_resources_data_lock_);

  // If for some reason we were unable to load the resources , return an empty
  // string (better than crashing).
  if (!locale_resources_data_.get()) {
    LOG(WARNING) << "locale resources are not loaded";
    return base::string16();
  }

  base::StringPiece data;
  if (!locale_resources_data_->GetStringPiece(message_id, &data)) {
    // Fall back on the main data pack (shouldn't be any strings here except in
    // unittests).
    data = GetRawDataResource(message_id);
    if (data.empty()) {
      NOTREACHED() << "unable to find resource: " << message_id;
      return base::string16();
    }
  }

  // Strings should not be loaded from a data pack that contains binary data.
  ResourceHandle::TextEncodingType encoding =
      locale_resources_data_->GetTextEncodingType();
  DCHECK(encoding == ResourceHandle::UTF16 || encoding == ResourceHandle::UTF8)
      << "requested localized string from binary pack file";

  // Data pack encodes strings as either UTF8 or UTF16.
  base::string16 msg;
  if (encoding == ResourceHandle::UTF16) {
    msg = base::string16(reinterpret_cast<const base::char16*>(data.data()),
                         data.length() / 2);
  } else if (encoding == ResourceHandle::UTF8) {
    msg = base::UTF8ToUTF16(data);
  }
  return msg;
}

const gfx::FontList& ResourceBundle::GetFontList(FontStyle style) {
  {
    base::AutoLock lock_scope(*images_and_fonts_lock_);
    LoadFontsIfNecessary();
  }
  switch (style) {
    case BoldFont:
      return *bold_font_list_;
    case SmallFont:
      return *small_font_list_;
    case MediumFont:
      return *medium_font_list_;
    case SmallBoldFont:
      return *small_bold_font_list_;
    case MediumBoldFont:
      return *medium_bold_font_list_;
    case LargeFont:
      return *large_font_list_;
    case LargeBoldFont:
      return *large_bold_font_list_;
    default:
      return *base_font_list_;
  }
}

const gfx::Font& ResourceBundle::GetFont(FontStyle style) {
  return GetFontList(style).GetPrimaryFont();
}

void ResourceBundle::ReloadFonts() {
  base::AutoLock lock_scope(*images_and_fonts_lock_);
  base_font_list_.reset();
  LoadFontsIfNecessary();
}

ScaleFactor ResourceBundle::GetMaxScaleFactor() const {
#if defined(OS_CHROMEOS) || defined(OS_WIN)
  return max_scale_factor_;
#else
  return GetSupportedScaleFactors().back();
#endif
}

ResourceBundle::ResourceBundle(Delegate* delegate)
    : delegate_(delegate),
      images_and_fonts_lock_(new base::Lock),
      locale_resources_data_lock_(new base::Lock),
      max_scale_factor_(SCALE_FACTOR_100P) {
}

ResourceBundle::~ResourceBundle() {
  FreeImages();
  UnloadLocaleResources();
}

// static
void ResourceBundle::InitSharedInstance(Delegate* delegate) {
  DCHECK(g_shared_instance_ == NULL) << "ResourceBundle initialized twice";
  g_shared_instance_ = new ResourceBundle(delegate);
  static std::vector<ScaleFactor> supported_scale_factors;
#if !defined(OS_IOS) && !defined(OS_WIN)
  // On platforms other than iOS, 100P is always a supported scale factor.
  // For Windows we have a separate case in this function.
  supported_scale_factors.push_back(SCALE_FACTOR_100P);
#endif
#if defined(OS_ANDROID)
  const gfx::Display display =
      gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
  const float display_density = display.device_scale_factor();
  const ScaleFactor closest = FindClosestScaleFactorUnsafe(display_density);
  if (closest != SCALE_FACTOR_100P)
    supported_scale_factors.push_back(closest);
#elif defined(OS_IOS)
    gfx::Display display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
  if (display.device_scale_factor() > 1.0) {
    DCHECK_EQ(2.0, display.device_scale_factor());
    supported_scale_factors.push_back(SCALE_FACTOR_200P);
  } else {
    supported_scale_factors.push_back(SCALE_FACTOR_100P);
  }
#elif defined(OS_MACOSX)
  if (base::mac::IsOSLionOrLater())
    supported_scale_factors.push_back(SCALE_FACTOR_200P);
#elif defined(OS_CHROMEOS)
  // TODO(oshima): Include 200P only if the device support 200P
  supported_scale_factors.push_back(SCALE_FACTOR_200P);
#elif defined(OS_LINUX) && defined(ENABLE_HIDPI)
  supported_scale_factors.push_back(SCALE_FACTOR_200P);
#elif defined(OS_WIN)
  bool default_to_100P = true;
  if (gfx::IsHighDPIEnabled()) {
    // On Windows if the dpi scale is greater than 1.25 on high dpi machines
    // downscaling from 200 percent looks better than scaling up from 100
    // percent.
    if (gfx::GetDPIScale() > 1.25) {
      supported_scale_factors.push_back(SCALE_FACTOR_200P);
      default_to_100P = false;
    }
  }
  if (default_to_100P)
    supported_scale_factors.push_back(SCALE_FACTOR_100P);
#endif
  ui::SetSupportedScaleFactors(supported_scale_factors);
#if defined(OS_WIN)
  // Must be called _after_ supported scale factors are set since it
  // uses them.
  ui::win::InitDeviceScaleFactor();
#endif
}

void ResourceBundle::FreeImages() {
  images_.clear();
}

void ResourceBundle::AddDataPackFromPathInternal(const base::FilePath& path,
                                                 ScaleFactor scale_factor,
                                                 bool optional) {
  // Do not pass an empty |path| value to this method. If the absolute path is
  // unknown pass just the pack file name.
  DCHECK(!path.empty());

  base::FilePath pack_path = path;
  if (delegate_)
    pack_path = delegate_->GetPathForResourcePack(pack_path, scale_factor);

  // Don't try to load empty values or values that are not absolute paths.
  if (pack_path.empty() || !pack_path.IsAbsolute())
    return;

  scoped_ptr<DataPack> data_pack(
      new DataPack(scale_factor));
  if (data_pack->LoadFromPath(pack_path)) {
    AddDataPack(data_pack.release());
  } else if (!optional) {
    LOG(ERROR) << "Failed to load " << pack_path.value()
               << "\nSome features may not be available.";
  }
}

void ResourceBundle::AddDataPack(DataPack* data_pack) {
  data_packs_.push_back(data_pack);

  if (GetImageScale(data_pack->GetScaleFactor()) >
      GetImageScale(max_scale_factor_))
    max_scale_factor_ = data_pack->GetScaleFactor();
}

void ResourceBundle::LoadFontsIfNecessary() {
  images_and_fonts_lock_->AssertAcquired();
  if (!base_font_list_.get()) {
    if (delegate_) {
      base_font_list_ = GetFontListFromDelegate(BaseFont);
      bold_font_list_ = GetFontListFromDelegate(BoldFont);
      small_font_list_ = GetFontListFromDelegate(SmallFont);
      small_bold_font_list_ = GetFontListFromDelegate(SmallBoldFont);
      medium_font_list_ = GetFontListFromDelegate(MediumFont);
      medium_bold_font_list_ = GetFontListFromDelegate(MediumBoldFont);
      large_font_list_ = GetFontListFromDelegate(LargeFont);
      large_bold_font_list_ = GetFontListFromDelegate(LargeBoldFont);
    }

    if (!base_font_list_.get())
      base_font_list_.reset(new gfx::FontList());

    if (!bold_font_list_.get()) {
      bold_font_list_.reset(new gfx::FontList());
      *bold_font_list_ = base_font_list_->DeriveWithStyle(
          base_font_list_->GetFontStyle() | gfx::Font::BOLD);
    }

    if (!small_font_list_.get()) {
      small_font_list_.reset(new gfx::FontList());
      *small_font_list_ =
          base_font_list_->DeriveWithSizeDelta(kSmallFontSizeDelta);
    }

    if (!small_bold_font_list_.get()) {
      small_bold_font_list_.reset(new gfx::FontList());
      *small_bold_font_list_ = small_font_list_->DeriveWithStyle(
          small_font_list_->GetFontStyle() | gfx::Font::BOLD);
    }

    if (!medium_font_list_.get()) {
      medium_font_list_.reset(new gfx::FontList());
      *medium_font_list_ =
          base_font_list_->DeriveWithSizeDelta(kMediumFontSizeDelta);
    }

    if (!medium_bold_font_list_.get()) {
      medium_bold_font_list_.reset(new gfx::FontList());
      *medium_bold_font_list_ = medium_font_list_->DeriveWithStyle(
          medium_font_list_->GetFontStyle() | gfx::Font::BOLD);
    }

    if (!large_font_list_.get()) {
      large_font_list_.reset(new gfx::FontList());
      *large_font_list_ =
          base_font_list_->DeriveWithSizeDelta(kLargeFontSizeDelta);
    }

    if (!large_bold_font_list_.get()) {
      large_bold_font_list_.reset(new gfx::FontList());
      *large_bold_font_list_ = large_font_list_->DeriveWithStyle(
          large_font_list_->GetFontStyle() | gfx::Font::BOLD);
    }
  }
}

scoped_ptr<gfx::FontList> ResourceBundle::GetFontListFromDelegate(
    FontStyle style) {
  DCHECK(delegate_);
  scoped_ptr<gfx::Font> font = delegate_->GetFont(style);
  if (font.get())
    return scoped_ptr<gfx::FontList>(new gfx::FontList(*font));
  return scoped_ptr<gfx::FontList>();
}

bool ResourceBundle::LoadBitmap(const ResourceHandle& data_handle,
                                int resource_id,
                                SkBitmap* bitmap,
                                bool* fell_back_to_1x) const {
  DCHECK(fell_back_to_1x);
  scoped_refptr<base::RefCountedMemory> memory(
      data_handle.GetStaticMemory(resource_id));
  if (!memory.get())
    return false;

  if (DecodePNG(memory->front(), memory->size(), bitmap, fell_back_to_1x))
    return true;

#if !defined(OS_IOS)
  // iOS does not compile or use the JPEG codec.  On other platforms,
  // 99% of our assets are PNGs, however fallback to JPEG.
  scoped_ptr<SkBitmap> jpeg_bitmap(
      gfx::JPEGCodec::Decode(memory->front(), memory->size()));
  if (jpeg_bitmap.get()) {
    bitmap->swap(*jpeg_bitmap.get());
    *fell_back_to_1x = false;
    return true;
  }
#endif

  NOTREACHED() << "Unable to decode theme image resource " << resource_id;
  return false;
}

bool ResourceBundle::LoadBitmap(int resource_id,
                                ScaleFactor* scale_factor,
                                SkBitmap* bitmap,
                                bool* fell_back_to_1x) const {
  DCHECK(fell_back_to_1x);
  for (size_t i = 0; i < data_packs_.size(); ++i) {
    // If the resource is in the package with SCALE_FACTOR_NONE, it
    // can be used in any scale factor, but set 100P in ImageSkia so
    // that it will be scaled property.
    if (data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE &&
        LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
      *scale_factor = ui::SCALE_FACTOR_100P;
      DCHECK(!*fell_back_to_1x);
      return true;
    }
    if (data_packs_[i]->GetScaleFactor() == *scale_factor &&
        LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
      return true;
    }
  }
  return false;
}

gfx::Image& ResourceBundle::GetEmptyImage() {
  base::AutoLock lock(*images_and_fonts_lock_);

  if (empty_image_.IsEmpty()) {
    // The placeholder bitmap is bright red so people notice the problem.
    SkBitmap bitmap;
    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 32, 32);
    bitmap.allocPixels();
    bitmap.eraseARGB(255, 255, 0, 0);
    empty_image_ = gfx::Image::CreateFrom1xBitmap(bitmap);
  }
  return empty_image_;
}

// static
bool ResourceBundle::ShouldHighlightMissingScaledResources() {
  return CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kHighlightMissingScaledResources);
}

// static
bool ResourceBundle::PNGContainsFallbackMarker(const unsigned char* buf,
                                               size_t size) {
  if (size < arraysize(kPngMagic) ||
      memcmp(buf, kPngMagic, arraysize(kPngMagic)) != 0) {
    // Data invalid or a JPEG.
    return false;
  }
  size_t pos = arraysize(kPngMagic);

  // Scan for custom chunks until we find one, find the IDAT chunk, or run out
  // of chunks.
  for (;;) {
    if (size - pos < kPngChunkMetadataSize)
      break;
    uint32 length = 0;
    base::ReadBigEndian(reinterpret_cast<const char*>(buf + pos), &length);
    if (size - pos - kPngChunkMetadataSize < length)
      break;
    if (length == 0 && memcmp(buf + pos + sizeof(uint32), kPngScaleChunkType,
                              arraysize(kPngScaleChunkType)) == 0) {
      return true;
    }
    if (memcmp(buf + pos + sizeof(uint32), kPngDataChunkType,
               arraysize(kPngDataChunkType)) == 0) {
      // Stop looking for custom chunks, any custom chunks should be before an
      // IDAT chunk.
      break;
    }
    pos += length + kPngChunkMetadataSize;
  }
  return false;
}

// static
bool ResourceBundle::DecodePNG(const unsigned char* buf,
                               size_t size,
                               SkBitmap* bitmap,
                               bool* fell_back_to_1x) {
  *fell_back_to_1x = PNGContainsFallbackMarker(buf, size);
  return gfx::PNGCodec::Decode(buf, size, bitmap);
}

#if !defined(OS_WIN)
// static
SkBitmap ResourceBundle::PlatformScaleImage(const SkBitmap& image,
                                            float loaded_image_scale,
                                            float desired_scale) {
  return image;
}
#endif

}  // namespace ui
/* [<][>][^][v][top][bottom][index][help] */
root/ui/base/resource/resource_bundle.cc

DEFINITIONS
