web_ui_util.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 "ui/webui/web_ui_util.h"

#include <vector>

#include "base/base64.h"
#include "base/debug/trace_event.h"
#include "base/i18n/rtl.h"
#include "base/logging.h"
#include "base/memory/ref_counted_memory.h"
#include "base/strings/string_number_conversions.h"
#include "googleurl/src/gurl.h"
#include "grit/app_locale_settings.h"
#include "net/base/escape.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/window_open_disposition.h"
#include "ui/gfx/codec/png_codec.h"
#include "ui/gfx/font.h"
#include "ui/gfx/image/image_skia.h"

#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif

namespace webui {

std::string GetBitmapDataUrl(const SkBitmap& bitmap) {
  TRACE_EVENT2("oobe", "GetImageDataUrl",
               "width", bitmap.width(), "height", bitmap.height());
  std::vector<unsigned char> output;
  gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &output);
  std::string str_url;
  str_url.insert(str_url.end(), output.begin(), output.end());

  base::Base64Encode(str_url, &str_url);
  str_url.insert(0, "data:image/png;base64,");
  return str_url;
}

std::string GetBitmapDataUrlFromResource(int res) {
  // Load resource icon and covert to base64 encoded data url
  base::RefCountedStaticMemory* icon_data =
      ResourceBundle::GetSharedInstance().LoadDataResourceBytesForScale(
          res, ui::SCALE_FACTOR_100P);
  if (!icon_data)
    return std::string();
  scoped_refptr<base::RefCountedMemory> raw_icon(icon_data);
  std::string str_url;
  str_url.insert(str_url.end(),
    raw_icon->front(),
    raw_icon->front() + raw_icon->size());
  base::Base64Encode(str_url, &str_url);
  str_url.insert(0, "data:image/png;base64,");
  return str_url;
}

WindowOpenDisposition GetDispositionFromClick(const ListValue* args,
                                              int start_index) {
  double button = 0.0;
  bool alt_key = false;
  bool ctrl_key = false;
  bool meta_key = false;
  bool shift_key = false;

  CHECK(args->GetDouble(start_index++, &button));
  CHECK(args->GetBoolean(start_index++, &alt_key));
  CHECK(args->GetBoolean(start_index++, &ctrl_key));
  CHECK(args->GetBoolean(start_index++, &meta_key));
  CHECK(args->GetBoolean(start_index++, &shift_key));
  return ui::DispositionFromClick(
      button == 1.0, alt_key, ctrl_key, meta_key, shift_key);
}

bool ParseScaleFactor(const base::StringPiece& identifier,
                      ui::ScaleFactor* scale_factor) {
  *scale_factor = ui::SCALE_FACTOR_100P;
  if (identifier.empty()) {
    LOG(ERROR) << "Invalid scale factor format: " << identifier;
    return false;
  }

  if (*identifier.rbegin() != 'x') {
    LOG(ERROR) << "Invalid scale factor format: " << identifier;
    return false;
  }

  double scale = 0;
  std::string stripped;
  identifier.substr(0, identifier.length() - 1).CopyToString(&stripped);
  if (!base::StringToDouble(stripped, &scale)) {
    LOG(ERROR) << "Invalid scale factor format: " << identifier;
    return false;
  }

  *scale_factor = ui::GetScaleFactorFromScale(static_cast<float>(scale));
  return true;
}

void ParsePathAndScale(const GURL& url,
                       std::string* path,
                       ui::ScaleFactor* scale_factor) {
  *path = net::UnescapeURLComponent(url.path().substr(1),
                                    (net::UnescapeRule::URL_SPECIAL_CHARS |
                                     net::UnescapeRule::SPACES));
  if (scale_factor)
    *scale_factor = ui::SCALE_FACTOR_100P;

  // Detect and parse resource string ending in @<scale>x.
  std::size_t pos = path->rfind('@');
  if (pos != std::string::npos) {
    base::StringPiece stripped_path(*path);
    ui::ScaleFactor factor;

    if (ParseScaleFactor(stripped_path.substr(
            pos + 1, stripped_path.length() - pos - 1), &factor)) {
      // Strip scale factor specification from path.
      stripped_path.remove_suffix(stripped_path.length() - pos);
      stripped_path.CopyToString(path);
    }
    if (scale_factor)
      *scale_factor = factor;
  }
}

// static
void SetFontAndTextDirection(DictionaryValue* localized_strings) {
  int web_font_family_id = IDS_WEB_FONT_FAMILY;
  int web_font_size_id = IDS_WEB_FONT_SIZE;
#if defined(OS_WIN)
  // Vary font settings for Windows XP.
  if (base::win::GetVersion() < base::win::VERSION_VISTA) {
    web_font_family_id = IDS_WEB_FONT_FAMILY_XP;
    web_font_size_id = IDS_WEB_FONT_SIZE_XP;
  }
#endif

  std::string font_family = l10n_util::GetStringUTF8(web_font_family_id);

#if defined(TOOLKIT_GTK)
  // Use the system font on Linux/GTK. Keep the hard-coded font families as
  // backup in case for some crazy reason this one isn't available.
  font_family = ui::ResourceBundle::GetSharedInstance().GetFont(
      ui::ResourceBundle::BaseFont).GetFontName() + ", " + font_family;
#endif

  localized_strings->SetString("fontfamily", font_family);
  localized_strings->SetString("fontsize",
      l10n_util::GetStringUTF8(web_font_size_id));
  localized_strings->SetString("textdirection",
      base::i18n::IsRTL() ? "rtl" : "ltr");
}

}  // namespace webui