chrome/browser/themes/browser_theme_pack.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/themes/browser_theme_pack.h"
   6
   7 #include <limits>
   8
   9 #include "base/files/file.h"
  10 #include "base/memory/ref_counted_memory.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/stl_util.h"
  13 #include "base/strings/string_number_conversions.h"
  14 #include "base/strings/string_util.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "base/threading/sequenced_worker_pool.h"
  17 #include "base/threading/thread_restrictions.h"
  18 #include "base/values.h"
  19 #include "chrome/browser/themes/theme_properties.h"
  20 #include "chrome/common/extensions/manifest_handlers/theme_handler.h"
  21 #include "content/public/browser/browser_thread.h"
  22 #include "extensions/common/id_util.h"
  23 #include "grit/theme_resources.h"
  24 #include "grit/ui_resources.h"
  25 #include "third_party/skia/include/core/SkCanvas.h"
  26 #include "ui/base/resource/data_pack.h"
  27 #include "ui/base/resource/resource_bundle.h"
  28 #include "ui/gfx/canvas.h"
  29 #include "ui/gfx/codec/png_codec.h"
  30 #include "ui/gfx/image/canvas_image_source.h"
  31 #include "ui/gfx/image/image.h"
  32 #include "ui/gfx/image/image_skia.h"
  33 #include "ui/gfx/image/image_skia_operations.h"
  34 #include "ui/gfx/screen.h"
  35 #include "ui/gfx/size_conversions.h"
  36 #include "ui/gfx/skia_util.h"
  37
  38 using content::BrowserThread;
  39 using extensions::Extension;
  40
  41 namespace {
  42
  43 // Version number of the current theme pack. We just throw out and rebuild
  44 // theme packs that aren't int-equal to this. Increment this number if you
  45 // change default theme assets.
  46 const int kThemePackVersion = 34;
  47
  48 // IDs that are in the DataPack won't clash with the positive integer
  49 // uint16. kHeaderID should always have the maximum value because we want the
  50 // "header" to be written last. That way we can detect whether the pack was
  51 // successfully written and ignore and regenerate if it was only partially
  52 // written (i.e. chrome crashed on a different thread while writing the pack).
  53 const int kMaxID = 0x0000FFFF;  // Max unsigned 16-bit int.
  54 const int kHeaderID = kMaxID - 1;
  55 const int kTintsID = kMaxID - 2;
  56 const int kColorsID = kMaxID - 3;
  57 const int kDisplayPropertiesID = kMaxID - 4;
  58 const int kSourceImagesID = kMaxID - 5;
  59 const int kScaleFactorsID = kMaxID - 6;
  60
  61 // The sum of kFrameBorderThickness and kNonClientRestoredExtraThickness from
  62 // OpaqueBrowserFrameView.
  63 const int kRestoredTabVerticalOffset = 15;
  64
  65 // Persistent constants for the main images that we need. These have the same
  66 // names as their IDR_* counterparts but these values will always stay the
  67 // same.
  68 const int PRS_THEME_FRAME = 1;
  69 const int PRS_THEME_FRAME_INACTIVE = 2;
  70 const int PRS_THEME_FRAME_INCOGNITO = 3;
  71 const int PRS_THEME_FRAME_INCOGNITO_INACTIVE = 4;
  72 const int PRS_THEME_TOOLBAR = 5;
  73 const int PRS_THEME_TAB_BACKGROUND = 6;
  74 const int PRS_THEME_TAB_BACKGROUND_INCOGNITO = 7;
  75 const int PRS_THEME_TAB_BACKGROUND_V = 8;
  76 const int PRS_THEME_NTP_BACKGROUND = 9;
  77 const int PRS_THEME_FRAME_OVERLAY = 10;
  78 const int PRS_THEME_FRAME_OVERLAY_INACTIVE = 11;
  79 const int PRS_THEME_BUTTON_BACKGROUND = 12;
  80 const int PRS_THEME_NTP_ATTRIBUTION = 13;
  81 const int PRS_THEME_WINDOW_CONTROL_BACKGROUND = 14;
  82
  83 struct PersistingImagesTable {
  84   // A non-changing integer ID meant to be saved in theme packs. This ID must
  85   // not change between versions of chrome.
  86   int persistent_id;
  87
  88   // The IDR that depends on the whims of GRIT and therefore changes whenever
  89   // someone adds a new resource.
  90   int idr_id;
  91
  92   // String to check for when parsing theme manifests or NULL if this isn't
  93   // supposed to be changeable by the user.
  94   const char* key;
  95 };
  96
  97 // IDR_* resource names change whenever new resources are added; use persistent
  98 // IDs when storing to a cached pack.
  99 PersistingImagesTable kPersistingImages[] = {
 100   { PRS_THEME_FRAME, IDR_THEME_FRAME,
 101     "theme_frame" },
 102   { PRS_THEME_FRAME_INACTIVE, IDR_THEME_FRAME_INACTIVE,
 103     "theme_frame_inactive" },
 104   { PRS_THEME_FRAME_INCOGNITO, IDR_THEME_FRAME_INCOGNITO,
 105     "theme_frame_incognito" },
 106   { PRS_THEME_FRAME_INCOGNITO_INACTIVE, IDR_THEME_FRAME_INCOGNITO_INACTIVE,
 107     "theme_frame_incognito_inactive" },
 108   { PRS_THEME_TOOLBAR, IDR_THEME_TOOLBAR,
 109     "theme_toolbar" },
 110   { PRS_THEME_TAB_BACKGROUND, IDR_THEME_TAB_BACKGROUND,
 111     "theme_tab_background" },
 112   { PRS_THEME_TAB_BACKGROUND_INCOGNITO, IDR_THEME_TAB_BACKGROUND_INCOGNITO,
 113     "theme_tab_background_incognito" },
 114   { PRS_THEME_TAB_BACKGROUND_V, IDR_THEME_TAB_BACKGROUND_V,
 115     "theme_tab_background_v"},
 116   { PRS_THEME_NTP_BACKGROUND, IDR_THEME_NTP_BACKGROUND,
 117     "theme_ntp_background" },
 118   { PRS_THEME_FRAME_OVERLAY, IDR_THEME_FRAME_OVERLAY,
 119     "theme_frame_overlay" },
 120   { PRS_THEME_FRAME_OVERLAY_INACTIVE, IDR_THEME_FRAME_OVERLAY_INACTIVE,
 121     "theme_frame_overlay_inactive" },
 122   { PRS_THEME_BUTTON_BACKGROUND, IDR_THEME_BUTTON_BACKGROUND,
 123     "theme_button_background" },
 124   { PRS_THEME_NTP_ATTRIBUTION, IDR_THEME_NTP_ATTRIBUTION,
 125     "theme_ntp_attribution" },
 126   { PRS_THEME_WINDOW_CONTROL_BACKGROUND, IDR_THEME_WINDOW_CONTROL_BACKGROUND,
 127     "theme_window_control_background"},
 128
 129   // The rest of these entries have no key because they can't be overridden
 130   // from the json manifest.
 131   { 15, IDR_BACK, NULL },
 132   { 16, IDR_BACK_D, NULL },
 133   { 17, IDR_BACK_H, NULL },
 134   { 18, IDR_BACK_P, NULL },
 135   { 19, IDR_FORWARD, NULL },
 136   { 20, IDR_FORWARD_D, NULL },
 137   { 21, IDR_FORWARD_H, NULL },
 138   { 22, IDR_FORWARD_P, NULL },
 139   { 23, IDR_HOME, NULL },
 140   { 24, IDR_HOME_H, NULL },
 141   { 25, IDR_HOME_P, NULL },
 142   { 26, IDR_RELOAD, NULL },
 143   { 27, IDR_RELOAD_H, NULL },
 144   { 28, IDR_RELOAD_P, NULL },
 145   { 29, IDR_STOP, NULL },
 146   { 30, IDR_STOP_D, NULL },
 147   { 31, IDR_STOP_H, NULL },
 148   { 32, IDR_STOP_P, NULL },
 149   { 33, IDR_BROWSER_ACTIONS_OVERFLOW, NULL },
 150   { 34, IDR_BROWSER_ACTIONS_OVERFLOW_H, NULL },
 151   { 35, IDR_BROWSER_ACTIONS_OVERFLOW_P, NULL },
 152   { 36, IDR_TOOLS, NULL },
 153   { 37, IDR_TOOLS_H, NULL },
 154   { 38, IDR_TOOLS_P, NULL },
 155   { 39, IDR_MENU_DROPARROW, NULL },
 156   { 40, IDR_THROBBER, NULL },
 157   { 41, IDR_THROBBER_WAITING, NULL },
 158   { 42, IDR_THROBBER_LIGHT, NULL },
 159   { 43, IDR_TOOLBAR_BEZEL_HOVER, NULL },
 160   { 44, IDR_TOOLBAR_BEZEL_PRESSED, NULL },
 161   { 45, IDR_TOOLS_BAR, NULL },
 162 };
 163 const size_t kPersistingImagesLength = arraysize(kPersistingImages);
 164
 165 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
 166 // Persistent theme ids for Windows.
 167 const int PRS_THEME_FRAME_DESKTOP = 100;
 168 const int PRS_THEME_FRAME_INACTIVE_DESKTOP = 101;
 169 const int PRS_THEME_FRAME_INCOGNITO_DESKTOP = 102;
 170 const int PRS_THEME_FRAME_INCOGNITO_INACTIVE_DESKTOP = 103;
 171 const int PRS_THEME_TOOLBAR_DESKTOP = 104;
 172 const int PRS_THEME_TAB_BACKGROUND_DESKTOP = 105;
 173 const int PRS_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP = 106;
 174
 175 // Persistent theme to resource id mapping for Windows AURA.
 176 PersistingImagesTable kPersistingImagesDesktopAura[] = {
 177   { PRS_THEME_FRAME_DESKTOP, IDR_THEME_FRAME_DESKTOP,
 178     "theme_frame" },
 179   { PRS_THEME_FRAME_INACTIVE_DESKTOP, IDR_THEME_FRAME_INACTIVE_DESKTOP,
 180     "theme_frame_inactive" },
 181   { PRS_THEME_FRAME_INCOGNITO_DESKTOP, IDR_THEME_FRAME_INCOGNITO_DESKTOP,
 182     "theme_frame_incognito" },
 183   { PRS_THEME_FRAME_INCOGNITO_INACTIVE_DESKTOP,
 184     IDR_THEME_FRAME_INCOGNITO_INACTIVE_DESKTOP,
 185     "theme_frame_incognito_inactive" },
 186   { PRS_THEME_TOOLBAR_DESKTOP, IDR_THEME_TOOLBAR_DESKTOP,
 187     "theme_toolbar" },
 188   { PRS_THEME_TAB_BACKGROUND_DESKTOP, IDR_THEME_TAB_BACKGROUND_DESKTOP,
 189     "theme_tab_background" },
 190   { PRS_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP,
 191     IDR_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP,
 192     "theme_tab_background_incognito" },
 193 };
 194 const size_t kPersistingImagesDesktopAuraLength =
 195     arraysize(kPersistingImagesDesktopAura);
 196 #endif
 197
 198 int GetPersistentIDByNameHelper(const std::string& key,
 199                                 const PersistingImagesTable* image_table,
 200                                 size_t image_table_size) {
 201   for (size_t i = 0; i < image_table_size; ++i) {
 202     if (image_table[i].key != NULL &&
 203         base::strcasecmp(key.c_str(), image_table[i].key) == 0) {
 204       return image_table[i].persistent_id;
 205     }
 206   }
 207   return -1;
 208 }
 209
 210 int GetPersistentIDByName(const std::string& key) {
 211   return GetPersistentIDByNameHelper(key,
 212                                      kPersistingImages,
 213                                      kPersistingImagesLength);
 214 }
 215
 216 int GetPersistentIDByIDR(int idr) {
 217   static std::map<int,int>* lookup_table = new std::map<int,int>();
 218   if (lookup_table->empty()) {
 219     for (size_t i = 0; i < kPersistingImagesLength; ++i) {
 220       int idr = kPersistingImages[i].idr_id;
 221       int prs_id = kPersistingImages[i].persistent_id;
 222       (*lookup_table)[idr] = prs_id;
 223     }
 224 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
 225     for (size_t i = 0; i < kPersistingImagesDesktopAuraLength; ++i) {
 226       int idr = kPersistingImagesDesktopAura[i].idr_id;
 227       int prs_id = kPersistingImagesDesktopAura[i].persistent_id;
 228       (*lookup_table)[idr] = prs_id;
 229     }
 230 #endif
 231   }
 232   std::map<int,int>::iterator it = lookup_table->find(idr);
 233   return (it == lookup_table->end()) ? -1 : it->second;
 234 }
 235
 236 // Returns true if the scales in |input| match those in |expected|.
 237 // The order must match as the index is used in determining the raw id.
 238 bool InputScalesValid(const base::StringPiece& input,
 239                       const std::vector<ui::ScaleFactor>& expected) {
 240   size_t scales_size = static_cast<size_t>(input.size() / sizeof(float));
 241   if (scales_size != expected.size())
 242     return false;
 243   scoped_ptr<float[]> scales(new float[scales_size]);
 244   // Do a memcpy to avoid misaligned memory access.
 245   memcpy(scales.get(), input.data(), input.size());
 246   for (size_t index = 0; index < scales_size; ++index) {
 247     if (scales[index] != ui::GetScaleForScaleFactor(expected[index]))
 248       return false;
 249   }
 250   return true;
 251 }
 252
 253 // Returns |scale_factors| as a string to be written to disk.
 254 std::string GetScaleFactorsAsString(
 255     const std::vector<ui::ScaleFactor>& scale_factors) {
 256   scoped_ptr<float[]> scales(new float[scale_factors.size()]);
 257   for (size_t i = 0; i < scale_factors.size(); ++i)
 258     scales[i] = ui::GetScaleForScaleFactor(scale_factors[i]);
 259   std::string out_string = std::string(
 260       reinterpret_cast<const char*>(scales.get()),
 261       scale_factors.size() * sizeof(float));
 262   return out_string;
 263 }
 264
 265 struct StringToIntTable {
 266   const char* key;
 267   ThemeProperties::OverwritableByUserThemeProperty id;
 268 };
 269
 270 // Strings used by themes to identify tints in the JSON.
 271 StringToIntTable kTintTable[] = {
 272   { "buttons", ThemeProperties::TINT_BUTTONS },
 273   { "frame", ThemeProperties::TINT_FRAME },
 274   { "frame_inactive", ThemeProperties::TINT_FRAME_INACTIVE },
 275   { "frame_incognito", ThemeProperties::TINT_FRAME_INCOGNITO },
 276   { "frame_incognito_inactive",
 277     ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE },
 278   { "background_tab", ThemeProperties::TINT_BACKGROUND_TAB },
 279 };
 280 const size_t kTintTableLength = arraysize(kTintTable);
 281
 282 // Strings used by themes to identify colors in the JSON.
 283 StringToIntTable kColorTable[] = {
 284   { "frame", ThemeProperties::COLOR_FRAME },
 285   { "frame_inactive", ThemeProperties::COLOR_FRAME_INACTIVE },
 286   { "frame_incognito", ThemeProperties::COLOR_FRAME_INCOGNITO },
 287   { "frame_incognito_inactive",
 288     ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE },
 289   { "toolbar", ThemeProperties::COLOR_TOOLBAR },
 290   { "tab_text", ThemeProperties::COLOR_TAB_TEXT },
 291   { "tab_background_text", ThemeProperties::COLOR_BACKGROUND_TAB_TEXT },
 292   { "bookmark_text", ThemeProperties::COLOR_BOOKMARK_TEXT },
 293   { "ntp_background", ThemeProperties::COLOR_NTP_BACKGROUND },
 294   { "ntp_text", ThemeProperties::COLOR_NTP_TEXT },
 295   { "ntp_link", ThemeProperties::COLOR_NTP_LINK },
 296   { "ntp_link_underline", ThemeProperties::COLOR_NTP_LINK_UNDERLINE },
 297   { "ntp_header", ThemeProperties::COLOR_NTP_HEADER },
 298   { "ntp_section", ThemeProperties::COLOR_NTP_SECTION },
 299   { "ntp_section_text", ThemeProperties::COLOR_NTP_SECTION_TEXT },
 300   { "ntp_section_link", ThemeProperties::COLOR_NTP_SECTION_LINK },
 301   { "ntp_section_link_underline",
 302     ThemeProperties::COLOR_NTP_SECTION_LINK_UNDERLINE },
 303   { "button_background", ThemeProperties::COLOR_BUTTON_BACKGROUND },
 304 };
 305 const size_t kColorTableLength = arraysize(kColorTable);
 306
 307 // Strings used by themes to identify display properties keys in JSON.
 308 StringToIntTable kDisplayProperties[] = {
 309   { "ntp_background_alignment",
 310     ThemeProperties::NTP_BACKGROUND_ALIGNMENT },
 311   { "ntp_background_repeat", ThemeProperties::NTP_BACKGROUND_TILING },
 312   { "ntp_logo_alternate", ThemeProperties::NTP_LOGO_ALTERNATE },
 313 };
 314 const size_t kDisplayPropertiesSize = arraysize(kDisplayProperties);
 315
 316 int GetIntForString(const std::string& key,
 317                     StringToIntTable* table,
 318                     size_t table_length) {
 319   for (size_t i = 0; i < table_length; ++i) {
 320     if (base::strcasecmp(key.c_str(), table[i].key) == 0) {
 321       return table[i].id;
 322     }
 323   }
 324
 325   return -1;
 326 }
 327
 328 struct IntToIntTable {
 329   int key;
 330   int value;
 331 };
 332
 333 // Mapping used in CreateFrameImages() to associate frame images with the
 334 // tint ID that should maybe be applied to it.
 335 IntToIntTable kFrameTintMap[] = {
 336   { PRS_THEME_FRAME, ThemeProperties::TINT_FRAME },
 337   { PRS_THEME_FRAME_INACTIVE, ThemeProperties::TINT_FRAME_INACTIVE },
 338   { PRS_THEME_FRAME_OVERLAY, ThemeProperties::TINT_FRAME },
 339   { PRS_THEME_FRAME_OVERLAY_INACTIVE,
 340     ThemeProperties::TINT_FRAME_INACTIVE },
 341   { PRS_THEME_FRAME_INCOGNITO, ThemeProperties::TINT_FRAME_INCOGNITO },
 342   { PRS_THEME_FRAME_INCOGNITO_INACTIVE,
 343     ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE },
 344 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
 345   { PRS_THEME_FRAME_DESKTOP, ThemeProperties::TINT_FRAME },
 346   { PRS_THEME_FRAME_INACTIVE_DESKTOP, ThemeProperties::TINT_FRAME_INACTIVE },
 347   { PRS_THEME_FRAME_INCOGNITO_DESKTOP, ThemeProperties::TINT_FRAME_INCOGNITO },
 348   { PRS_THEME_FRAME_INCOGNITO_INACTIVE_DESKTOP,
 349     ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE },
 350 #endif
 351 };
 352
 353 // Mapping used in GenerateTabBackgroundImages() to associate what frame image
 354 // goes with which tab background.
 355 IntToIntTable kTabBackgroundMap[] = {
 356   { PRS_THEME_TAB_BACKGROUND, PRS_THEME_FRAME },
 357   { PRS_THEME_TAB_BACKGROUND_INCOGNITO, PRS_THEME_FRAME_INCOGNITO },
 358 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
 359   { PRS_THEME_TAB_BACKGROUND_DESKTOP, PRS_THEME_FRAME_DESKTOP },
 360   { PRS_THEME_TAB_BACKGROUND_INCOGNITO_DESKTOP,
 361     PRS_THEME_FRAME_INCOGNITO_DESKTOP },
 362 #endif
 363 };
 364
 365 struct CropEntry {
 366   int prs_id;
 367
 368   // The maximum useful height of the image at |prs_id|.
 369   int max_height;
 370
 371   // Whether cropping the image at |prs_id| should be skipped on OSes which
 372   // have a frame border to the left and right of the web contents.
 373   // This should be true for images which can be used to decorate the border to
 374   // the left and the right of the web contents.
 375   bool skip_if_frame_border;
 376 };
 377
 378 // The images which should be cropped before being saved to the data pack. The
 379 // maximum heights are meant to be conservative as to give room for the UI to
 380 // change without the maximum heights having to be modified.
 381 // |kThemePackVersion| must be incremented if any of the maximum heights below
 382 // are modified.
 383 struct CropEntry kImagesToCrop[] = {
 384   { PRS_THEME_FRAME, 120, true },
 385   { PRS_THEME_FRAME_INACTIVE, 120, true },
 386   { PRS_THEME_FRAME_INCOGNITO, 120, true },
 387   { PRS_THEME_FRAME_INCOGNITO_INACTIVE, 120, true },
 388   { PRS_THEME_FRAME_OVERLAY, 120, true },
 389   { PRS_THEME_FRAME_OVERLAY_INACTIVE, 120, true },
 390   { PRS_THEME_TOOLBAR, 200, false },
 391   { PRS_THEME_BUTTON_BACKGROUND, 60, false },
 392   { PRS_THEME_WINDOW_CONTROL_BACKGROUND, 50, false },
 393 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
 394   { PRS_THEME_TOOLBAR_DESKTOP, 200, false }
 395 #endif
 396 };
 397
 398
 399 // A list of images that don't need tinting or any other modification and can
 400 // be byte-copied directly into the finished DataPack. This should contain the
 401 // persistent IDs for all themeable image IDs that aren't in kFrameTintMap,
 402 // kTabBackgroundMap or kImagesToCrop.
 403 const int kPreloadIDs[] = {
 404   PRS_THEME_NTP_BACKGROUND,
 405   PRS_THEME_NTP_ATTRIBUTION,
 406 };
 407
 408 // Returns true if this OS uses a browser frame which has a non zero width to
 409 // the left and the right of the web contents.
 410 bool HasFrameBorder() {
 411 #if defined(OS_CHROMEOS) || defined(OS_MACOSX)
 412   return false;
 413 #else
 414   return true;
 415 #endif
 416 }
 417
 418 // Returns a piece of memory with the contents of the file |path|.
 419 base::RefCountedMemory* ReadFileData(const base::FilePath& path) {
 420   if (!path.empty()) {
 421     base::File file(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
 422     if (file.IsValid()) {
 423       int64 length = file.GetLength();
 424       if (length > 0 && length < INT_MAX) {
 425         int size = static_cast<int>(length);
 426         std::vector<unsigned char> raw_data;
 427         raw_data.resize(size);
 428         char* data = reinterpret_cast<char*>(&(raw_data.front()));
 429         if (file.ReadAtCurrentPos(data, size) == length)
 430           return base::RefCountedBytes::TakeVector(&raw_data);
 431       }
 432     }
 433   }
 434
 435   return NULL;
 436 }
 437
 438 // Shifts an image's HSL values. The caller is responsible for deleting
 439 // the returned image.
 440 gfx::Image CreateHSLShiftedImage(const gfx::Image& image,
 441                                  const color_utils::HSL& hsl_shift) {
 442   const gfx::ImageSkia* src_image = image.ToImageSkia();
 443   return gfx::Image(gfx::ImageSkiaOperations::CreateHSLShiftedImage(
 444       *src_image, hsl_shift));
 445 }
 446
 447 // Computes a bitmap at one scale from a bitmap at a different scale.
 448 SkBitmap CreateLowQualityResizedBitmap(const SkBitmap& source_bitmap,
 449                                        ui::ScaleFactor source_scale_factor,
 450                                        ui::ScaleFactor desired_scale_factor) {
 451   gfx::Size scaled_size = gfx::ToCeiledSize(
 452       gfx::ScaleSize(gfx::Size(source_bitmap.width(),
 453                                source_bitmap.height()),
 454                      ui::GetScaleForScaleFactor(desired_scale_factor) /
 455                      ui::GetScaleForScaleFactor(source_scale_factor)));
 456   SkBitmap scaled_bitmap;
 457   scaled_bitmap.setConfig(SkBitmap::kARGB_8888_Config,
 458                           scaled_size.width(),
 459                           scaled_size.height());
 460   if (!scaled_bitmap.allocPixels())
 461     SK_CRASH();
 462   scaled_bitmap.eraseARGB(0, 0, 0, 0);
 463   SkCanvas canvas(scaled_bitmap);
 464   SkRect scaled_bounds = RectToSkRect(gfx::Rect(scaled_size));
 465   // Note(oshima): The following scaling code doesn't work with
 466   // a mask image.
 467   canvas.drawBitmapRect(source_bitmap, NULL, scaled_bounds);
 468   return scaled_bitmap;
 469 }
 470
 471 // A ImageSkiaSource that scales 100P image to the target scale factor
 472 // if the ImageSkiaRep for the target scale factor isn't available.
 473 class ThemeImageSource: public gfx::ImageSkiaSource {
 474  public:
 475   explicit ThemeImageSource(const gfx::ImageSkia& source) : source_(source) {
 476   }
 477   virtual ~ThemeImageSource() {}
 478
 479   virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
 480     if (source_.HasRepresentation(scale))
 481       return source_.GetRepresentation(scale);
 482     const gfx::ImageSkiaRep& rep_100p = source_.GetRepresentation(1.0f);
 483     SkBitmap scaled_bitmap = CreateLowQualityResizedBitmap(
 484         rep_100p.sk_bitmap(),
 485         ui::SCALE_FACTOR_100P,
 486         ui::GetSupportedScaleFactor(scale));
 487     return gfx::ImageSkiaRep(scaled_bitmap, scale);
 488   }
 489
 490  private:
 491   const gfx::ImageSkia source_;
 492
 493   DISALLOW_COPY_AND_ASSIGN(ThemeImageSource);
 494 };
 495
 496 // An ImageSkiaSource that delays decoding PNG data into bitmaps until
 497 // needed. Missing data for a scale factor is computed by scaling data for an
 498 // available scale factor. Computed bitmaps are stored for future look up.
 499 class ThemeImagePngSource : public gfx::ImageSkiaSource {
 500  public:
 501   typedef std::map<ui::ScaleFactor,
 502                    scoped_refptr<base::RefCountedMemory> > PngMap;
 503
 504   explicit ThemeImagePngSource(const PngMap& png_map) : png_map_(png_map) {}
 505
 506   virtual ~ThemeImagePngSource() {}
 507
 508  private:
 509   virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
 510     ui::ScaleFactor scale_factor = ui::GetSupportedScaleFactor(scale);
 511     // Look up the bitmap for |scale factor| in the bitmap map. If found
 512     // return it.
 513     BitmapMap::const_iterator exact_bitmap_it = bitmap_map_.find(scale_factor);
 514     if (exact_bitmap_it != bitmap_map_.end())
 515       return gfx::ImageSkiaRep(exact_bitmap_it->second, scale);
 516
 517     // Look up the raw PNG data for |scale_factor| in the png map. If found,
 518     // decode it, store the result in the bitmap map and return it.
 519     PngMap::const_iterator exact_png_it = png_map_.find(scale_factor);
 520     if (exact_png_it != png_map_.end()) {
 521       SkBitmap bitmap;
 522       if (!gfx::PNGCodec::Decode(exact_png_it->second->front(),
 523                                  exact_png_it->second->size(),
 524                                  &bitmap)) {
 525         NOTREACHED();
 526         return gfx::ImageSkiaRep();
 527       }
 528       bitmap_map_[scale_factor] = bitmap;
 529       return gfx::ImageSkiaRep(bitmap, scale);
 530     }
 531
 532     // Find an available PNG for another scale factor. We want to use the
 533     // highest available scale factor.
 534     PngMap::const_iterator available_png_it = png_map_.end();
 535     for (PngMap::const_iterator png_it = png_map_.begin();
 536          png_it != png_map_.end(); ++png_it) {
 537       if (available_png_it == png_map_.end() ||
 538           ui::GetScaleForScaleFactor(png_it->first) >
 539           ui::GetScaleForScaleFactor(available_png_it->first)) {
 540         available_png_it = png_it;
 541       }
 542     }
 543     if (available_png_it == png_map_.end())
 544       return gfx::ImageSkiaRep();
 545     ui::ScaleFactor available_scale_factor = available_png_it->first;
 546
 547     // Look up the bitmap for |available_scale_factor| in the bitmap map.
 548     // If not found, decode the corresponging png data, store the result
 549     // in the bitmap map.
 550     BitmapMap::const_iterator available_bitmap_it =
 551         bitmap_map_.find(available_scale_factor);
 552     if (available_bitmap_it == bitmap_map_.end()) {
 553       SkBitmap available_bitmap;
 554       if (!gfx::PNGCodec::Decode(available_png_it->second->front(),
 555                                  available_png_it->second->size(),
 556                                  &available_bitmap)) {
 557         NOTREACHED();
 558         return gfx::ImageSkiaRep();
 559       }
 560       bitmap_map_[available_scale_factor] = available_bitmap;
 561       available_bitmap_it = bitmap_map_.find(available_scale_factor);
 562     }
 563
 564     // Scale the available bitmap to the desired scale factor, store the result
 565     // in the bitmap map and return it.
 566     SkBitmap scaled_bitmap = CreateLowQualityResizedBitmap(
 567         available_bitmap_it->second,
 568         available_scale_factor,
 569         scale_factor);
 570     bitmap_map_[scale_factor] = scaled_bitmap;
 571     return gfx::ImageSkiaRep(scaled_bitmap, scale);
 572   }
 573
 574   PngMap png_map_;
 575
 576   typedef std::map<ui::ScaleFactor, SkBitmap> BitmapMap;
 577   BitmapMap bitmap_map_;
 578
 579   DISALLOW_COPY_AND_ASSIGN(ThemeImagePngSource);
 580 };
 581
 582 class TabBackgroundImageSource: public gfx::CanvasImageSource {
 583  public:
 584   TabBackgroundImageSource(const gfx::ImageSkia& image_to_tint,
 585                            const gfx::ImageSkia& overlay,
 586                            const color_utils::HSL& hsl_shift,
 587                            int vertical_offset)
 588       : gfx::CanvasImageSource(image_to_tint.size(), false),
 589         image_to_tint_(image_to_tint),
 590         overlay_(overlay),
 591         hsl_shift_(hsl_shift),
 592         vertical_offset_(vertical_offset) {
 593   }
 594
 595   virtual ~TabBackgroundImageSource() {
 596   }
 597
 598   // Overridden from CanvasImageSource:
 599   virtual void Draw(gfx::Canvas* canvas) OVERRIDE {
 600     gfx::ImageSkia bg_tint =
 601         gfx::ImageSkiaOperations::CreateHSLShiftedImage(image_to_tint_,
 602             hsl_shift_);
 603     canvas->TileImageInt(bg_tint, 0, vertical_offset_, 0, 0,
 604         size().width(), size().height());
 605
 606     // If they've provided a custom image, overlay it.
 607     if (!overlay_.isNull()) {
 608       canvas->TileImageInt(overlay_, 0, 0, size().width(),
 609                            overlay_.height());
 610     }
 611   }
 612
 613  private:
 614   const gfx::ImageSkia image_to_tint_;
 615   const gfx::ImageSkia overlay_;
 616   const color_utils::HSL hsl_shift_;
 617   const int vertical_offset_;
 618
 619   DISALLOW_COPY_AND_ASSIGN(TabBackgroundImageSource);
 620 };
 621
 622 }  // namespace
 623
 624 BrowserThemePack::~BrowserThemePack() {
 625   if (!data_pack_.get()) {
 626     delete header_;
 627     delete [] tints_;
 628     delete [] colors_;
 629     delete [] display_properties_;
 630     delete [] source_images_;
 631   }
 632 }
 633
 634 // static
 635 scoped_refptr<BrowserThemePack> BrowserThemePack::BuildFromExtension(
 636     const Extension* extension) {
 637   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 638   DCHECK(extension);
 639   DCHECK(extension->is_theme());
 640
 641   scoped_refptr<BrowserThemePack> pack(new BrowserThemePack);
 642   pack->BuildHeader(extension);
 643   pack->BuildTintsFromJSON(extensions::ThemeInfo::GetTints(extension));
 644   pack->BuildColorsFromJSON(extensions::ThemeInfo::GetColors(extension));
 645   pack->BuildDisplayPropertiesFromJSON(
 646       extensions::ThemeInfo::GetDisplayProperties(extension));
 647
 648   // Builds the images. (Image building is dependent on tints).
 649   FilePathMap file_paths;
 650   pack->ParseImageNamesFromJSON(
 651       extensions::ThemeInfo::GetImages(extension),
 652       extension->path(),
 653       &file_paths);
 654   pack->BuildSourceImagesArray(file_paths);
 655
 656   if (!pack->LoadRawBitmapsTo(file_paths, &pack->images_on_ui_thread_))
 657     return NULL;
 658
 659   pack->CreateImages(&pack->images_on_ui_thread_);
 660
 661   // Make sure the |images_on_file_thread_| has bitmaps for supported
 662   // scale factors before passing to FILE thread.
 663   pack->images_on_file_thread_ = pack->images_on_ui_thread_;
 664   for (ImageCache::iterator it = pack->images_on_file_thread_.begin();
 665        it != pack->images_on_file_thread_.end(); ++it) {
 666     gfx::ImageSkia* image_skia =
 667         const_cast<gfx::ImageSkia*>(it->second.ToImageSkia());
 668     image_skia->MakeThreadSafe();
 669   }
 670
 671   // Set ThemeImageSource on |images_on_ui_thread_| to resample the source
 672   // image if a caller of BrowserThemePack::GetImageNamed() requests an
 673   // ImageSkiaRep for a scale factor not specified by the theme author.
 674   // Callers of BrowserThemePack::GetImageNamed() to be able to retrieve
 675   // ImageSkiaReps for all supported scale factors.
 676   for (ImageCache::iterator it = pack->images_on_ui_thread_.begin();
 677        it != pack->images_on_ui_thread_.end(); ++it) {
 678     const gfx::ImageSkia source_image_skia = it->second.AsImageSkia();
 679     ThemeImageSource* source = new ThemeImageSource(source_image_skia);
 680     // image_skia takes ownership of source.
 681     gfx::ImageSkia image_skia(source, source_image_skia.size());
 682     it->second = gfx::Image(image_skia);
 683   }
 684
 685   // Generate raw images (for new-tab-page attribution and background) for
 686   // any missing scale from an available scale image.
 687   for (size_t i = 0; i < arraysize(kPreloadIDs); ++i) {
 688     pack->GenerateRawImageForAllSupportedScales(kPreloadIDs[i]);
 689   }
 690
 691   // The BrowserThemePack is now in a consistent state.
 692   return pack;
 693 }
 694
 695 // static
 696 scoped_refptr<BrowserThemePack> BrowserThemePack::BuildFromDataPack(
 697     const base::FilePath& path, const std::string& expected_id) {
 698   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 699   // Allow IO on UI thread due to deep-seated theme design issues.
 700   // (see http://crbug.com/80206)
 701   base::ThreadRestrictions::ScopedAllowIO allow_io;
 702   scoped_refptr<BrowserThemePack> pack(new BrowserThemePack);
 703   // Scale factor parameter is moot as data pack has image resources for all
 704   // supported scale factors.
 705   pack->data_pack_.reset(
 706       new ui::DataPack(ui::SCALE_FACTOR_NONE));
 707
 708   if (!pack->data_pack_->LoadFromPath(path)) {
 709     LOG(ERROR) << "Failed to load theme data pack.";
 710     return NULL;
 711   }
 712
 713   base::StringPiece pointer;
 714   if (!pack->data_pack_->GetStringPiece(kHeaderID, &pointer))
 715     return NULL;
 716   pack->header_ = reinterpret_cast<BrowserThemePackHeader*>(const_cast<char*>(
 717       pointer.data()));
 718
 719   if (pack->header_->version != kThemePackVersion) {
 720     DLOG(ERROR) << "BuildFromDataPack failure! Version mismatch!";
 721     return NULL;
 722   }
 723   // TODO(erg): Check endianess once DataPack works on the other endian.
 724   std::string theme_id(reinterpret_cast<char*>(pack->header_->theme_id),
 725                        extensions::id_util::kIdSize);
 726   std::string truncated_id =
 727       expected_id.substr(0, extensions::id_util::kIdSize);
 728   if (theme_id != truncated_id) {
 729     DLOG(ERROR) << "Wrong id: " << theme_id << " vs " << expected_id;
 730     return NULL;
 731   }
 732
 733   if (!pack->data_pack_->GetStringPiece(kTintsID, &pointer))
 734     return NULL;
 735   pack->tints_ = reinterpret_cast<TintEntry*>(const_cast<char*>(
 736       pointer.data()));
 737
 738   if (!pack->data_pack_->GetStringPiece(kColorsID, &pointer))
 739     return NULL;
 740   pack->colors_ =
 741       reinterpret_cast<ColorPair*>(const_cast<char*>(pointer.data()));
 742
 743   if (!pack->data_pack_->GetStringPiece(kDisplayPropertiesID, &pointer))
 744     return NULL;
 745   pack->display_properties_ = reinterpret_cast<DisplayPropertyPair*>(
 746       const_cast<char*>(pointer.data()));
 747
 748   if (!pack->data_pack_->GetStringPiece(kSourceImagesID, &pointer))
 749     return NULL;
 750   pack->source_images_ = reinterpret_cast<int*>(
 751       const_cast<char*>(pointer.data()));
 752
 753   if (!pack->data_pack_->GetStringPiece(kScaleFactorsID, &pointer))
 754     return NULL;
 755
 756   if (!InputScalesValid(pointer, pack->scale_factors_)) {
 757     DLOG(ERROR) << "BuildFromDataPack failure! The pack scale factors differ "
 758                 << "from those supported by platform.";
 759     return NULL;
 760   }
 761   return pack;
 762 }
 763
 764 // static
 765 void BrowserThemePack::GetThemeableImageIDRs(std::set<int>* result) {
 766   if (!result)
 767     return;
 768
 769   result->clear();
 770   for (size_t i = 0; i < kPersistingImagesLength; ++i)
 771     result->insert(kPersistingImages[i].idr_id);
 772
 773 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
 774   for (size_t i = 0; i < kPersistingImagesDesktopAuraLength; ++i)
 775     result->insert(kPersistingImagesDesktopAura[i].idr_id);
 776 #endif
 777 }
 778
 779 bool BrowserThemePack::WriteToDisk(const base::FilePath& path) const {
 780   // Add resources for each of the property arrays.
 781   RawDataForWriting resources;
 782   resources[kHeaderID] = base::StringPiece(
 783       reinterpret_cast<const char*>(header_), sizeof(BrowserThemePackHeader));
 784   resources[kTintsID] = base::StringPiece(
 785       reinterpret_cast<const char*>(tints_),
 786       sizeof(TintEntry[kTintTableLength]));
 787   resources[kColorsID] = base::StringPiece(
 788       reinterpret_cast<const char*>(colors_),
 789       sizeof(ColorPair[kColorTableLength]));
 790   resources[kDisplayPropertiesID] = base::StringPiece(
 791       reinterpret_cast<const char*>(display_properties_),
 792       sizeof(DisplayPropertyPair[kDisplayPropertiesSize]));
 793
 794   int source_count = 1;
 795   int* end = source_images_;
 796   for (; *end != -1 ; end++)
 797     source_count++;
 798   resources[kSourceImagesID] = base::StringPiece(
 799       reinterpret_cast<const char*>(source_images_),
 800       source_count * sizeof(*source_images_));
 801
 802   // Store results of GetScaleFactorsAsString() in std::string as
 803   // base::StringPiece does not copy data in constructor.
 804   std::string scale_factors_string = GetScaleFactorsAsString(scale_factors_);
 805   resources[kScaleFactorsID] = scale_factors_string;
 806
 807   AddRawImagesTo(image_memory_, &resources);
 808
 809   RawImages reencoded_images;
 810   RepackImages(images_on_file_thread_, &reencoded_images);
 811   AddRawImagesTo(reencoded_images, &resources);
 812
 813   return ui::DataPack::WritePack(path, resources, ui::DataPack::BINARY);
 814 }
 815
 816 bool BrowserThemePack::GetTint(int id, color_utils::HSL* hsl) const {
 817   if (tints_) {
 818     for (size_t i = 0; i < kTintTableLength; ++i) {
 819       if (tints_[i].id == id) {
 820         hsl->h = tints_[i].h;
 821         hsl->s = tints_[i].s;
 822         hsl->l = tints_[i].l;
 823         return true;
 824       }
 825     }
 826   }
 827
 828   return false;
 829 }
 830
 831 bool BrowserThemePack::GetColor(int id, SkColor* color) const {
 832   if (colors_) {
 833     for (size_t i = 0; i < kColorTableLength; ++i) {
 834       if (colors_[i].id == id) {
 835         *color = colors_[i].color;
 836         return true;
 837       }
 838     }
 839   }
 840
 841   return false;
 842 }
 843
 844 bool BrowserThemePack::GetDisplayProperty(int id, int* result) const {
 845   if (display_properties_) {
 846     for (size_t i = 0; i < kDisplayPropertiesSize; ++i) {
 847       if (display_properties_[i].id == id) {
 848         *result = display_properties_[i].property;
 849         return true;
 850       }
 851     }
 852   }
 853
 854   return false;
 855 }
 856
 857 gfx::Image BrowserThemePack::GetImageNamed(int idr_id) {
 858   int prs_id = GetPersistentIDByIDR(idr_id);
 859   if (prs_id == -1)
 860     return gfx::Image();
 861
 862   // Check if the image is cached.
 863   ImageCache::const_iterator image_iter = images_on_ui_thread_.find(prs_id);
 864   if (image_iter != images_on_ui_thread_.end())
 865     return image_iter->second;
 866
 867   ThemeImagePngSource::PngMap png_map;
 868   for (size_t i = 0; i < scale_factors_.size(); ++i) {
 869     scoped_refptr<base::RefCountedMemory> memory =
 870         GetRawData(idr_id, scale_factors_[i]);
 871     if (memory.get())
 872       png_map[scale_factors_[i]] = memory;
 873   }
 874   if (!png_map.empty()) {
 875     gfx::ImageSkia image_skia(new ThemeImagePngSource(png_map), 1.0f);
 876     // |image_skia| takes ownership of ThemeImagePngSource.
 877     gfx::Image ret = gfx::Image(image_skia);
 878     images_on_ui_thread_[prs_id] = ret;
 879     return ret;
 880   }
 881
 882   return gfx::Image();
 883 }
 884
 885 base::RefCountedMemory* BrowserThemePack::GetRawData(
 886     int idr_id,
 887     ui::ScaleFactor scale_factor) const {
 888   base::RefCountedMemory* memory = NULL;
 889   int prs_id = GetPersistentIDByIDR(idr_id);
 890   int raw_id = GetRawIDByPersistentID(prs_id, scale_factor);
 891
 892   if (raw_id != -1) {
 893     if (data_pack_.get()) {
 894       memory = data_pack_->GetStaticMemory(raw_id);
 895     } else {
 896       RawImages::const_iterator it = image_memory_.find(raw_id);
 897       if (it != image_memory_.end()) {
 898         memory = it->second.get();
 899       }
 900     }
 901   }
 902
 903   return memory;
 904 }
 905
 906 bool BrowserThemePack::HasCustomImage(int idr_id) const {
 907   int prs_id = GetPersistentIDByIDR(idr_id);
 908   if (prs_id == -1)
 909     return false;
 910
 911   int* img = source_images_;
 912   for (; *img != -1; ++img) {
 913     if (*img == prs_id)
 914       return true;
 915   }
 916
 917   return false;
 918 }
 919
 920 // private:
 921
 922 BrowserThemePack::BrowserThemePack()
 923     : CustomThemeSupplier(EXTENSION),
 924       header_(NULL),
 925       tints_(NULL),
 926       colors_(NULL),
 927       display_properties_(NULL),
 928       source_images_(NULL) {
 929   scale_factors_ = ui::GetSupportedScaleFactors();
 930   // On Windows HiDPI SCALE_FACTOR_100P may not be supported by default.
 931   if (std::find(scale_factors_.begin(), scale_factors_.end(),
 932                 ui::SCALE_FACTOR_100P) == scale_factors_.end()) {
 933     scale_factors_.push_back(ui::SCALE_FACTOR_100P);
 934   }
 935 }
 936
 937 void BrowserThemePack::BuildHeader(const Extension* extension) {
 938   header_ = new BrowserThemePackHeader;
 939   header_->version = kThemePackVersion;
 940
 941   // TODO(erg): Need to make this endian safe on other computers. Prerequisite
 942   // is that ui::DataPack removes this same check.
 943 #if defined(__BYTE_ORDER)
 944   // Linux check
 945   COMPILE_ASSERT(__BYTE_ORDER == __LITTLE_ENDIAN,
 946                  datapack_assumes_little_endian);
 947 #elif defined(__BIG_ENDIAN__)
 948   // Mac check
 949   #error DataPack assumes little endian
 950 #endif
 951   header_->little_endian = 1;
 952
 953   const std::string& id = extension->id();
 954   memcpy(header_->theme_id, id.c_str(), extensions::id_util::kIdSize);
 955 }
 956
 957 void BrowserThemePack::BuildTintsFromJSON(
 958     const base::DictionaryValue* tints_value) {
 959   tints_ = new TintEntry[kTintTableLength];
 960   for (size_t i = 0; i < kTintTableLength; ++i) {
 961     tints_[i].id = -1;
 962     tints_[i].h = -1;
 963     tints_[i].s = -1;
 964     tints_[i].l = -1;
 965   }
 966
 967   if (!tints_value)
 968     return;
 969
 970   // Parse the incoming data from |tints_value| into an intermediary structure.
 971   std::map<int, color_utils::HSL> temp_tints;
 972   for (base::DictionaryValue::Iterator iter(*tints_value); !iter.IsAtEnd();
 973        iter.Advance()) {
 974     const base::ListValue* tint_list;
 975     if (iter.value().GetAsList(&tint_list) &&
 976         (tint_list->GetSize() == 3)) {
 977       color_utils::HSL hsl = { -1, -1, -1 };
 978
 979       if (tint_list->GetDouble(0, &hsl.h) &&
 980           tint_list->GetDouble(1, &hsl.s) &&
 981           tint_list->GetDouble(2, &hsl.l)) {
 982         int id = GetIntForString(iter.key(), kTintTable, kTintTableLength);
 983         if (id != -1) {
 984           temp_tints[id] = hsl;
 985         }
 986       }
 987     }
 988   }
 989
 990   // Copy data from the intermediary data structure to the array.
 991   size_t count = 0;
 992   for (std::map<int, color_utils::HSL>::const_iterator it =
 993            temp_tints.begin();
 994        it != temp_tints.end() && count < kTintTableLength;
 995        ++it, ++count) {
 996     tints_[count].id = it->first;
 997     tints_[count].h = it->second.h;
 998     tints_[count].s = it->second.s;
 999     tints_[count].l = it->second.l;
1000   }
1001 }
1002
1003 void BrowserThemePack::BuildColorsFromJSON(
1004     const base::DictionaryValue* colors_value) {
1005   colors_ = new ColorPair[kColorTableLength];
1006   for (size_t i = 0; i < kColorTableLength; ++i) {
1007     colors_[i].id = -1;
1008     colors_[i].color = SkColorSetRGB(0, 0, 0);
1009   }
1010
1011   std::map<int, SkColor> temp_colors;
1012   if (colors_value)
1013     ReadColorsFromJSON(colors_value, &temp_colors);
1014   GenerateMissingColors(&temp_colors);
1015
1016   // Copy data from the intermediary data structure to the array.
1017   size_t count = 0;
1018   for (std::map<int, SkColor>::const_iterator it = temp_colors.begin();
1019        it != temp_colors.end() && count < kColorTableLength; ++it, ++count) {
1020     colors_[count].id = it->first;
1021     colors_[count].color = it->second;
1022   }
1023 }
1024
1025 void BrowserThemePack::ReadColorsFromJSON(
1026     const base::DictionaryValue* colors_value,
1027     std::map<int, SkColor>* temp_colors) {
1028   // Parse the incoming data from |colors_value| into an intermediary structure.
1029   for (base::DictionaryValue::Iterator iter(*colors_value); !iter.IsAtEnd();
1030        iter.Advance()) {
1031     const base::ListValue* color_list;
1032     if (iter.value().GetAsList(&color_list) &&
1033         ((color_list->GetSize() == 3) || (color_list->GetSize() == 4))) {
1034       SkColor color = SK_ColorWHITE;
1035       int r, g, b;
1036       if (color_list->GetInteger(0, &r) &&
1037           color_list->GetInteger(1, &g) &&
1038           color_list->GetInteger(2, &b)) {
1039         if (color_list->GetSize() == 4) {
1040           double alpha;
1041           int alpha_int;
1042           if (color_list->GetDouble(3, &alpha)) {
1043             color = SkColorSetARGB(static_cast<int>(alpha * 255), r, g, b);
1044           } else if (color_list->GetInteger(3, &alpha_int) &&
1045                      (alpha_int == 0 || alpha_int == 1)) {
1046             color = SkColorSetARGB(alpha_int ? 255 : 0, r, g, b);
1047           } else {
1048             // Invalid entry for part 4.
1049             continue;
1050           }
1051         } else {
1052           color = SkColorSetRGB(r, g, b);
1053         }
1054
1055         int id = GetIntForString(iter.key(), kColorTable, kColorTableLength);
1056         if (id != -1) {
1057           (*temp_colors)[id] = color;
1058         }
1059       }
1060     }
1061   }
1062 }
1063
1064 void BrowserThemePack::GenerateMissingColors(
1065     std::map<int, SkColor>* colors) {
1066   // Generate link colors, if missing. (See GetColor()).
1067   if (!colors->count(ThemeProperties::COLOR_NTP_HEADER) &&
1068       colors->count(ThemeProperties::COLOR_NTP_SECTION)) {
1069     (*colors)[ThemeProperties::COLOR_NTP_HEADER] =
1070         (*colors)[ThemeProperties::COLOR_NTP_SECTION];
1071   }
1072
1073   if (!colors->count(ThemeProperties::COLOR_NTP_SECTION_LINK_UNDERLINE) &&
1074       colors->count(ThemeProperties::COLOR_NTP_SECTION_LINK)) {
1075     SkColor color_section_link =
1076         (*colors)[ThemeProperties::COLOR_NTP_SECTION_LINK];
1077     (*colors)[ThemeProperties::COLOR_NTP_SECTION_LINK_UNDERLINE] =
1078         SkColorSetA(color_section_link, SkColorGetA(color_section_link) / 3);
1079   }
1080
1081   if (!colors->count(ThemeProperties::COLOR_NTP_LINK_UNDERLINE) &&
1082       colors->count(ThemeProperties::COLOR_NTP_LINK)) {
1083     SkColor color_link = (*colors)[ThemeProperties::COLOR_NTP_LINK];
1084     (*colors)[ThemeProperties::COLOR_NTP_LINK_UNDERLINE] =
1085         SkColorSetA(color_link, SkColorGetA(color_link) / 3);
1086   }
1087
1088   // Generate frame colors, if missing. (See GenerateFrameColors()).
1089   SkColor frame;
1090   std::map<int, SkColor>::const_iterator it =
1091       colors->find(ThemeProperties::COLOR_FRAME);
1092   if (it != colors->end()) {
1093     frame = it->second;
1094   } else {
1095     frame = ThemeProperties::GetDefaultColor(
1096         ThemeProperties::COLOR_FRAME);
1097   }
1098
1099   if (!colors->count(ThemeProperties::COLOR_FRAME)) {
1100     (*colors)[ThemeProperties::COLOR_FRAME] =
1101         HSLShift(frame, GetTintInternal(ThemeProperties::TINT_FRAME));
1102   }
1103   if (!colors->count(ThemeProperties::COLOR_FRAME_INACTIVE)) {
1104     (*colors)[ThemeProperties::COLOR_FRAME_INACTIVE] =
1105         HSLShift(frame, GetTintInternal(
1106             ThemeProperties::TINT_FRAME_INACTIVE));
1107   }
1108   if (!colors->count(ThemeProperties::COLOR_FRAME_INCOGNITO)) {
1109     (*colors)[ThemeProperties::COLOR_FRAME_INCOGNITO] =
1110         HSLShift(frame, GetTintInternal(
1111             ThemeProperties::TINT_FRAME_INCOGNITO));
1112   }
1113   if (!colors->count(ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE)) {
1114     (*colors)[ThemeProperties::COLOR_FRAME_INCOGNITO_INACTIVE] =
1115         HSLShift(frame, GetTintInternal(
1116             ThemeProperties::TINT_FRAME_INCOGNITO_INACTIVE));
1117   }
1118 }
1119
1120 void BrowserThemePack::BuildDisplayPropertiesFromJSON(
1121     const base::DictionaryValue* display_properties_value) {
1122   display_properties_ = new DisplayPropertyPair[kDisplayPropertiesSize];
1123   for (size_t i = 0; i < kDisplayPropertiesSize; ++i) {
1124     display_properties_[i].id = -1;
1125     display_properties_[i].property = 0;
1126   }
1127
1128   if (!display_properties_value)
1129     return;
1130
1131   std::map<int, int> temp_properties;
1132   for (base::DictionaryValue::Iterator iter(*display_properties_value);
1133        !iter.IsAtEnd(); iter.Advance()) {
1134     int property_id = GetIntForString(iter.key(), kDisplayProperties,
1135                                       kDisplayPropertiesSize);
1136     switch (property_id) {
1137       case ThemeProperties::NTP_BACKGROUND_ALIGNMENT: {
1138         std::string val;
1139         if (iter.value().GetAsString(&val)) {
1140           temp_properties[ThemeProperties::NTP_BACKGROUND_ALIGNMENT] =
1141               ThemeProperties::StringToAlignment(val);
1142         }
1143         break;
1144       }
1145       case ThemeProperties::NTP_BACKGROUND_TILING: {
1146         std::string val;
1147         if (iter.value().GetAsString(&val)) {
1148           temp_properties[ThemeProperties::NTP_BACKGROUND_TILING] =
1149               ThemeProperties::StringToTiling(val);
1150         }
1151         break;
1152       }
1153       case ThemeProperties::NTP_LOGO_ALTERNATE: {
1154         int val = 0;
1155         if (iter.value().GetAsInteger(&val))
1156           temp_properties[ThemeProperties::NTP_LOGO_ALTERNATE] = val;
1157         break;
1158       }
1159     }
1160   }
1161
1162   // Copy data from the intermediary data structure to the array.
1163   size_t count = 0;
1164   for (std::map<int, int>::const_iterator it = temp_properties.begin();
1165        it != temp_properties.end() && count < kDisplayPropertiesSize;
1166        ++it, ++count) {
1167     display_properties_[count].id = it->first;
1168     display_properties_[count].property = it->second;
1169   }
1170 }
1171
1172 void BrowserThemePack::ParseImageNamesFromJSON(
1173     const base::DictionaryValue* images_value,
1174     const base::FilePath& images_path,
1175     FilePathMap* file_paths) const {
1176   if (!images_value)
1177     return;
1178
1179   for (base::DictionaryValue::Iterator iter(*images_value); !iter.IsAtEnd();
1180        iter.Advance()) {
1181     if (iter.value().IsType(base::Value::TYPE_DICTIONARY)) {
1182       const base::DictionaryValue* inner_value = NULL;
1183       if (iter.value().GetAsDictionary(&inner_value)) {
1184         for (base::DictionaryValue::Iterator inner_iter(*inner_value);
1185              !inner_iter.IsAtEnd();
1186              inner_iter.Advance()) {
1187           std::string name;
1188           ui::ScaleFactor scale_factor = ui::SCALE_FACTOR_NONE;
1189           if (GetScaleFactorFromManifestKey(inner_iter.key(), &scale_factor) &&
1190               inner_iter.value().IsType(base::Value::TYPE_STRING) &&
1191               inner_iter.value().GetAsString(&name)) {
1192             AddFileAtScaleToMap(iter.key(),
1193                                 scale_factor,
1194                                 images_path.AppendASCII(name),
1195                                 file_paths);
1196           }
1197         }
1198       }
1199     } else if (iter.value().IsType(base::Value::TYPE_STRING)) {
1200       std::string name;
1201       if (iter.value().GetAsString(&name)) {
1202         AddFileAtScaleToMap(iter.key(),
1203                             ui::SCALE_FACTOR_100P,
1204                             images_path.AppendASCII(name),
1205                             file_paths);
1206       }
1207     }
1208   }
1209 }
1210
1211 void BrowserThemePack::AddFileAtScaleToMap(const std::string& image_name,
1212                                            ui::ScaleFactor scale_factor,
1213                                            const base::FilePath& image_path,
1214                                            FilePathMap* file_paths) const {
1215   int id = GetPersistentIDByName(image_name);
1216   if (id != -1)
1217     (*file_paths)[id][scale_factor] = image_path;
1218 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
1219   id = GetPersistentIDByNameHelper(image_name,
1220                                    kPersistingImagesDesktopAura,
1221                                    kPersistingImagesDesktopAuraLength);
1222   if (id != -1)
1223     (*file_paths)[id][scale_factor] = image_path;
1224 #endif
1225 }
1226
1227 void BrowserThemePack::BuildSourceImagesArray(const FilePathMap& file_paths) {
1228   std::vector<int> ids;
1229   for (FilePathMap::const_iterator it = file_paths.begin();
1230        it != file_paths.end(); ++it) {
1231     ids.push_back(it->first);
1232   }
1233
1234   source_images_ = new int[ids.size() + 1];
1235   std::copy(ids.begin(), ids.end(), source_images_);
1236   source_images_[ids.size()] = -1;
1237 }
1238
1239 bool BrowserThemePack::LoadRawBitmapsTo(
1240     const FilePathMap& file_paths,
1241     ImageCache* image_cache) {
1242   // Themes should be loaded on the file thread, not the UI thread.
1243   // http://crbug.com/61838
1244   base::ThreadRestrictions::ScopedAllowIO allow_io;
1245
1246   for (FilePathMap::const_iterator it = file_paths.begin();
1247        it != file_paths.end(); ++it) {
1248     int prs_id = it->first;
1249     // Some images need to go directly into |image_memory_|. No modification is
1250     // necessary or desirable.
1251     bool is_copyable = false;
1252     for (size_t i = 0; i < arraysize(kPreloadIDs); ++i) {
1253       if (kPreloadIDs[i] == prs_id) {
1254         is_copyable = true;
1255         break;
1256       }
1257     }
1258     gfx::ImageSkia image_skia;
1259     for (int pass = 0; pass < 2; ++pass) {
1260       // Two passes: In the first pass, we process only scale factor
1261       // 100% and in the second pass all other scale factors. We
1262       // process scale factor 100% first because the first image added
1263       // in image_skia.AddRepresentation() determines the DIP size for
1264       // all representations.
1265       for (ScaleFactorToFileMap::const_iterator s2f = it->second.begin();
1266            s2f != it->second.end(); ++s2f) {
1267         ui::ScaleFactor scale_factor = s2f->first;
1268         if ((pass == 0 && scale_factor != ui::SCALE_FACTOR_100P) ||
1269             (pass == 1 && scale_factor == ui::SCALE_FACTOR_100P)) {
1270           continue;
1271         }
1272         scoped_refptr<base::RefCountedMemory> raw_data(
1273             ReadFileData(s2f->second));
1274         if (!raw_data.get() || !raw_data->size()) {
1275           LOG(ERROR) << "Could not load theme image"
1276                      << " prs_id=" << prs_id
1277                      << " scale_factor_enum=" << scale_factor
1278                      << " file=" << s2f->second.value()
1279                      << (raw_data.get() ? " (zero size)" : " (read error)");
1280           return false;
1281         }
1282         if (is_copyable) {
1283           int raw_id = GetRawIDByPersistentID(prs_id, scale_factor);
1284           image_memory_[raw_id] = raw_data;
1285         } else {
1286           SkBitmap bitmap;
1287           if (gfx::PNGCodec::Decode(raw_data->front(), raw_data->size(),
1288                                     &bitmap)) {
1289             image_skia.AddRepresentation(
1290                 gfx::ImageSkiaRep(bitmap,
1291                                   ui::GetScaleForScaleFactor(scale_factor)));
1292           } else {
1293             NOTREACHED() << "Unable to decode theme image resource "
1294                          << it->first;
1295           }
1296         }
1297       }
1298     }
1299     if (!is_copyable && !image_skia.isNull())
1300       (*image_cache)[prs_id] = gfx::Image(image_skia);
1301   }
1302
1303   return true;
1304 }
1305
1306 void BrowserThemePack::CreateImages(ImageCache* images) const {
1307   CropImages(images);
1308   CreateFrameImages(images);
1309   CreateTintedButtons(GetTintInternal(ThemeProperties::TINT_BUTTONS), images);
1310   CreateTabBackgroundImages(images);
1311 }
1312
1313 void BrowserThemePack::CropImages(ImageCache* images) const {
1314   bool has_frame_border = HasFrameBorder();
1315   for (size_t i = 0; i < arraysize(kImagesToCrop); ++i) {
1316     if (has_frame_border && kImagesToCrop[i].skip_if_frame_border)
1317       continue;
1318
1319     int prs_id = kImagesToCrop[i].prs_id;
1320     ImageCache::iterator it = images->find(prs_id);
1321     if (it == images->end())
1322       continue;
1323
1324     int crop_height = kImagesToCrop[i].max_height;
1325     gfx::ImageSkia image_skia = it->second.AsImageSkia();
1326     (*images)[prs_id] = gfx::Image(gfx::ImageSkiaOperations::ExtractSubset(
1327         image_skia, gfx::Rect(0, 0, image_skia.width(), crop_height)));
1328   }
1329 }
1330
1331 void BrowserThemePack::CreateFrameImages(ImageCache* images) const {
1332   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
1333
1334   // Create all the output images in a separate cache and move them back into
1335   // the input images because there can be name collisions.
1336   ImageCache temp_output;
1337
1338   for (size_t i = 0; i < arraysize(kFrameTintMap); ++i) {
1339     int prs_id = kFrameTintMap[i].key;
1340     gfx::Image frame;
1341     // If there's no frame image provided for the specified id, then load
1342     // the default provided frame. If that's not provided, skip this whole
1343     // thing and just use the default images.
1344     int prs_base_id = 0;
1345
1346 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
1347     if (prs_id == PRS_THEME_FRAME_INCOGNITO_INACTIVE_DESKTOP) {
1348       prs_base_id = images->count(PRS_THEME_FRAME_INCOGNITO_DESKTOP) ?
1349                     PRS_THEME_FRAME_INCOGNITO_DESKTOP : PRS_THEME_FRAME_DESKTOP;
1350     } else if (prs_id == PRS_THEME_FRAME_INACTIVE_DESKTOP) {
1351       prs_base_id = PRS_THEME_FRAME_DESKTOP;
1352     } else if (prs_id == PRS_THEME_FRAME_INCOGNITO_DESKTOP &&
1353                 !images->count(PRS_THEME_FRAME_INCOGNITO_DESKTOP)) {
1354       prs_base_id = PRS_THEME_FRAME_DESKTOP;
1355     }
1356 #endif
1357     if (!prs_base_id) {
1358       if (prs_id == PRS_THEME_FRAME_INCOGNITO_INACTIVE) {
1359         prs_base_id = images->count(PRS_THEME_FRAME_INCOGNITO) ?
1360                       PRS_THEME_FRAME_INCOGNITO : PRS_THEME_FRAME;
1361       } else if (prs_id == PRS_THEME_FRAME_OVERLAY_INACTIVE) {
1362         prs_base_id = PRS_THEME_FRAME_OVERLAY;
1363       } else if (prs_id == PRS_THEME_FRAME_INACTIVE) {
1364         prs_base_id = PRS_THEME_FRAME;
1365       } else if (prs_id == PRS_THEME_FRAME_INCOGNITO &&
1366                  !images->count(PRS_THEME_FRAME_INCOGNITO)) {
1367         prs_base_id = PRS_THEME_FRAME;
1368       } else {
1369         prs_base_id = prs_id;
1370       }
1371     }
1372     if (images->count(prs_id)) {
1373       frame = (*images)[prs_id];
1374     } else if (prs_base_id != prs_id && images->count(prs_base_id)) {
1375       frame = (*images)[prs_base_id];
1376     } else if (prs_base_id == PRS_THEME_FRAME_OVERLAY) {
1377 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
1378       if (images->count(PRS_THEME_FRAME_DESKTOP)) {
1379 #else
1380       if (images->count(PRS_THEME_FRAME)) {
1381 #endif
1382         // If there is no theme overlay, don't tint the default frame,
1383         // because it will overwrite the custom frame image when we cache and
1384         // reload from disk.
1385         frame = gfx::Image();
1386       }
1387     } else {
1388       // If the theme doesn't specify an image, then apply the tint to
1389       // the default frame.
1390       frame = rb.GetImageNamed(IDR_THEME_FRAME);
1391 #if defined(USE_ASH) && !defined(OS_CHROMEOS)
1392       if (prs_id >= PRS_THEME_FRAME_DESKTOP &&
1393           prs_id <= PRS_THEME_FRAME_INCOGNITO_INACTIVE_DESKTOP) {
1394         frame = rb.GetImageNamed(IDR_THEME_FRAME_DESKTOP);
1395       }
1396 #endif
1397     }
1398     if (!frame.IsEmpty()) {
1399       temp_output[prs_id] = CreateHSLShiftedImage(
1400           frame, GetTintInternal(kFrameTintMap[i].value));
1401     }
1402   }
1403   MergeImageCaches(temp_output, images);
1404 }
1405
1406 void BrowserThemePack::CreateTintedButtons(
1407     const color_utils::HSL& button_tint,
1408     ImageCache* processed_images) const {
1409   if (button_tint.h != -1 || button_tint.s != -1 || button_tint.l != -1) {
1410     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
1411     const std::set<int>& idr_ids =
1412         ThemeProperties::GetTintableToolbarButtons();
1413     for (std::set<int>::const_iterator it = idr_ids.begin();
1414          it != idr_ids.end(); ++it) {
1415       int prs_id = GetPersistentIDByIDR(*it);
1416       DCHECK(prs_id > 0);
1417
1418       // Fetch the image by IDR...
1419       gfx::Image& button = rb.GetImageNamed(*it);
1420
1421       // but save a version with the persistent ID.
1422       (*processed_images)[prs_id] =
1423           CreateHSLShiftedImage(button, button_tint);
1424     }
1425   }
1426 }
1427
1428 void BrowserThemePack::CreateTabBackgroundImages(ImageCache* images) const {
1429   ImageCache temp_output;
1430   for (size_t i = 0; i < arraysize(kTabBackgroundMap); ++i) {
1431     int prs_id = kTabBackgroundMap[i].key;
1432     int prs_base_id = kTabBackgroundMap[i].value;
1433
1434     // We only need to generate the background tab images if we were provided
1435     // with a PRS_THEME_FRAME.
1436     ImageCache::const_iterator it = images->find(prs_base_id);
1437     if (it != images->end()) {
1438       gfx::ImageSkia image_to_tint = (it->second).AsImageSkia();
1439       color_utils::HSL hsl_shift = GetTintInternal(
1440           ThemeProperties::TINT_BACKGROUND_TAB);
1441       int vertical_offset = images->count(prs_id)
1442                             ? kRestoredTabVerticalOffset : 0;
1443
1444       gfx::ImageSkia overlay;
1445       ImageCache::const_iterator overlay_it = images->find(prs_id);
1446       if (overlay_it != images->end())
1447         overlay = overlay_it->second.AsImageSkia();
1448
1449       gfx::ImageSkiaSource* source = new TabBackgroundImageSource(
1450           image_to_tint, overlay, hsl_shift, vertical_offset);
1451       // ImageSkia takes ownership of |source|.
1452       temp_output[prs_id] = gfx::Image(gfx::ImageSkia(source,
1453           image_to_tint.size()));
1454     }
1455   }
1456   MergeImageCaches(temp_output, images);
1457 }
1458
1459 void BrowserThemePack::RepackImages(const ImageCache& images,
1460                                     RawImages* reencoded_images) const {
1461   for (ImageCache::const_iterator it = images.begin();
1462        it != images.end(); ++it) {
1463     gfx::ImageSkia image_skia = *it->second.ToImageSkia();
1464
1465     typedef std::vector<gfx::ImageSkiaRep> ImageSkiaReps;
1466     ImageSkiaReps image_reps = image_skia.image_reps();
1467     if (image_reps.empty()) {
1468       NOTREACHED() << "No image reps for resource " << it->first << ".";
1469     }
1470     for (ImageSkiaReps::iterator rep_it = image_reps.begin();
1471          rep_it != image_reps.end(); ++rep_it) {
1472       std::vector<unsigned char> bitmap_data;
1473       if (!gfx::PNGCodec::EncodeBGRASkBitmap(rep_it->sk_bitmap(), false,
1474                                              &bitmap_data)) {
1475         NOTREACHED() << "Image file for resource " << it->first
1476                      << " could not be encoded.";
1477       }
1478       int raw_id = GetRawIDByPersistentID(
1479           it->first,
1480           ui::GetSupportedScaleFactor(rep_it->scale()));
1481       (*reencoded_images)[raw_id] =
1482           base::RefCountedBytes::TakeVector(&bitmap_data);
1483     }
1484   }
1485 }
1486
1487 void BrowserThemePack::MergeImageCaches(
1488     const ImageCache& source, ImageCache* destination) const {
1489   for (ImageCache::const_iterator it = source.begin(); it != source.end();
1490        ++it) {
1491     (*destination)[it->first] = it->second;
1492   }
1493 }
1494
1495 void BrowserThemePack::AddRawImagesTo(const RawImages& images,
1496                                       RawDataForWriting* out) const {
1497   for (RawImages::const_iterator it = images.begin(); it != images.end();
1498        ++it) {
1499     (*out)[it->first] = base::StringPiece(
1500         it->second->front_as<char>(), it->second->size());
1501   }
1502 }
1503
1504 color_utils::HSL BrowserThemePack::GetTintInternal(int id) const {
1505   if (tints_) {
1506     for (size_t i = 0; i < kTintTableLength; ++i) {
1507       if (tints_[i].id == id) {
1508         color_utils::HSL hsl;
1509         hsl.h = tints_[i].h;
1510         hsl.s = tints_[i].s;
1511         hsl.l = tints_[i].l;
1512         return hsl;
1513       }
1514     }
1515   }
1516
1517   return ThemeProperties::GetDefaultTint(id);
1518 }
1519
1520 int BrowserThemePack::GetRawIDByPersistentID(
1521     int prs_id,
1522     ui::ScaleFactor scale_factor) const {
1523   if (prs_id < 0)
1524     return -1;
1525
1526   for (size_t i = 0; i < scale_factors_.size(); ++i) {
1527     if (scale_factors_[i] == scale_factor)
1528       return static_cast<int>(kPersistingImagesLength * i) + prs_id;
1529   }
1530   return -1;
1531 }
1532
1533 bool BrowserThemePack::GetScaleFactorFromManifestKey(
1534     const std::string& key,
1535     ui::ScaleFactor* scale_factor) const {
1536   int percent = 0;
1537   if (base::StringToInt(key, &percent)) {
1538     float scale = static_cast<float>(percent) / 100.0f;
1539     for (size_t i = 0; i < scale_factors_.size(); ++i) {
1540       if (fabs(ui::GetScaleForScaleFactor(scale_factors_[i]) - scale)
1541               < 0.001) {
1542         *scale_factor = scale_factors_[i];
1543         return true;
1544       }
1545     }
1546   }
1547   return false;
1548 }
1549
1550 void BrowserThemePack::GenerateRawImageForAllSupportedScales(int prs_id) {
1551   // Compute (by scaling) bitmaps for |prs_id| for any scale factors
1552   // for which the theme author did not provide a bitmap. We compute
1553   // the bitmaps using the highest scale factor that theme author
1554   // provided.
1555   // Note: We use only supported scale factors. For example, if scale
1556   // factor 2x is supported by the current system, but 1.8x is not and
1557   // if the theme author did not provide an image for 2x but one for
1558   // 1.8x, we will not use the 1.8x image here. Here we will only use
1559   // images provided for scale factors supported by the current system.
1560
1561   // See if any image is missing. If not, we're done.
1562   bool image_missing = false;
1563   for (size_t i = 0; i < scale_factors_.size(); ++i) {
1564     int raw_id = GetRawIDByPersistentID(prs_id, scale_factors_[i]);
1565     if (image_memory_.find(raw_id) == image_memory_.end()) {
1566       image_missing = true;
1567       break;
1568     }
1569   }
1570   if (!image_missing)
1571     return;
1572
1573   // Find available scale factor with highest scale.
1574   ui::ScaleFactor available_scale_factor = ui::SCALE_FACTOR_NONE;
1575   for (size_t i = 0; i < scale_factors_.size(); ++i) {
1576     int raw_id = GetRawIDByPersistentID(prs_id, scale_factors_[i]);
1577     if ((available_scale_factor == ui::SCALE_FACTOR_NONE ||
1578          (ui::GetScaleForScaleFactor(scale_factors_[i]) >
1579           ui::GetScaleForScaleFactor(available_scale_factor))) &&
1580         image_memory_.find(raw_id) != image_memory_.end()) {
1581       available_scale_factor = scale_factors_[i];
1582     }
1583   }
1584   // If no scale factor is available, we're done.
1585   if (available_scale_factor == ui::SCALE_FACTOR_NONE)
1586     return;
1587
1588   // Get bitmap for the available scale factor.
1589   int available_raw_id = GetRawIDByPersistentID(prs_id, available_scale_factor);
1590   RawImages::const_iterator it = image_memory_.find(available_raw_id);
1591   SkBitmap available_bitmap;
1592   if (!gfx::PNGCodec::Decode(it->second->front(),
1593                              it->second->size(),
1594                              &available_bitmap)) {
1595     NOTREACHED() << "Unable to decode theme image for prs_id="
1596                  << prs_id << " for scale_factor=" << available_scale_factor;
1597     return;
1598   }
1599
1600   // Fill in all missing scale factors by scaling the available bitmap.
1601   for (size_t i = 0; i < scale_factors_.size(); ++i) {
1602     int scaled_raw_id = GetRawIDByPersistentID(prs_id, scale_factors_[i]);
1603     if (image_memory_.find(scaled_raw_id) != image_memory_.end())
1604       continue;
1605     SkBitmap scaled_bitmap =
1606         CreateLowQualityResizedBitmap(available_bitmap,
1607                                       available_scale_factor,
1608                                       scale_factors_[i]);
1609     std::vector<unsigned char> bitmap_data;
1610     if (!gfx::PNGCodec::EncodeBGRASkBitmap(scaled_bitmap,
1611                                            false,
1612                                            &bitmap_data)) {
1613       NOTREACHED() << "Unable to encode theme image for prs_id="
1614                    << prs_id << " for scale_factor=" << scale_factors_[i];
1615       break;
1616     }
1617     image_memory_[scaled_raw_id] =
1618         base::RefCountedBytes::TakeVector(&bitmap_data);
1619   }
1620 }