ui/base/resource/resource_bundle_ios.mm

   1 // Copyright 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 "ui/base/resource/resource_bundle.h"
   6
   7 #import <QuartzCore/QuartzCore.h>
   8 #import <UIKit/UIKit.h>
   9
  10 #include "base/basictypes.h"
  11 #include "base/file_util.h"
  12 #include "base/files/file_path.h"
  13 #include "base/mac/bundle_locations.h"
  14 #include "base/mac/foundation_util.h"
  15 #include "base/mac/scoped_nsobject.h"
  16 #include "base/memory/ref_counted_memory.h"
  17 #include "base/strings/sys_string_conversions.h"
  18 #include "base/synchronization/lock.h"
  19 #include "ui/base/resource/resource_handle.h"
  20 #include "ui/gfx/image/image.h"
  21
  22 namespace ui {
  23
  24 namespace {
  25
  26 base::FilePath GetResourcesPakFilePath(NSString* name, NSString* mac_locale) {
  27   NSString *resource_path;
  28   if ([mac_locale length]) {
  29     resource_path = [base::mac::FrameworkBundle() pathForResource:name
  30                                                            ofType:@"pak"
  31                                                       inDirectory:@""
  32                                                   forLocalization:mac_locale];
  33   } else {
  34     resource_path = [base::mac::FrameworkBundle() pathForResource:name
  35                                                            ofType:@"pak"];
  36   }
  37   if (!resource_path) {
  38     // Return just the name of the pak file.
  39     return base::FilePath(base::SysNSStringToUTF8(name) + ".pak");
  40   }
  41   return base::FilePath([resource_path fileSystemRepresentation]);
  42 }
  43
  44 }  // namespace
  45
  46 void ResourceBundle::LoadCommonResources() {
  47   AddDataPackFromPath(GetResourcesPakFilePath(@"chrome", nil),
  48                       ui::SCALE_FACTOR_NONE);
  49
  50   if (IsScaleFactorSupported(SCALE_FACTOR_100P)) {
  51     AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_100_percent", nil),
  52                         SCALE_FACTOR_100P);
  53   }
  54
  55   if (IsScaleFactorSupported(SCALE_FACTOR_200P)) {
  56     AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_200_percent", nil),
  57                         SCALE_FACTOR_200P);
  58   }
  59 }
  60
  61 base::FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
  62                                                  bool test_file_exists) {
  63   NSString* mac_locale = base::SysUTF8ToNSString(app_locale);
  64
  65   // iOS uses "_" instead of "-", so swap to get a iOS-style value.
  66   mac_locale = [mac_locale stringByReplacingOccurrencesOfString:@"-"
  67                                                      withString:@"_"];
  68
  69   // On disk, the "en_US" resources are just "en" (http://crbug.com/25578).
  70   if ([mac_locale isEqual:@"en_US"])
  71     mac_locale = @"en";
  72
  73   base::FilePath locale_file_path =
  74       GetResourcesPakFilePath(@"locale", mac_locale);
  75
  76   if (delegate_) {
  77     locale_file_path =
  78         delegate_->GetPathForLocalePack(locale_file_path, app_locale);
  79   }
  80
  81   // Don't try to load empty values or values that are not absolute paths.
  82   if (locale_file_path.empty() || !locale_file_path.IsAbsolute())
  83     return base::FilePath();
  84
  85   if (test_file_exists && !base::PathExists(locale_file_path))
  86     return base::FilePath();
  87
  88   return locale_file_path;
  89 }
  90
  91 gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
  92   // Flipped images are not used on iOS.
  93   DCHECK_EQ(rtl, RTL_DISABLED);
  94
  95   // Check to see if the image is already in the cache.
  96   {
  97     base::AutoLock lock(*images_and_fonts_lock_);
  98     ImageMap::iterator found = images_.find(resource_id);
  99     if (found != images_.end()) {
 100       return found->second;
 101     }
 102   }
 103
 104   gfx::Image image;
 105   if (delegate_)
 106     image = delegate_->GetNativeImageNamed(resource_id, rtl);
 107
 108   if (image.IsEmpty()) {
 109     // Load the raw data from the resource pack at the current supported scale
 110     // factor.  This code assumes that only one of the possible scale factors is
 111     // supported at runtime, based on the device resolution.
 112     ui::ScaleFactor scale_factor = GetMaxScaleFactor();
 113
 114     scoped_refptr<base::RefCountedStaticMemory> data(
 115         LoadDataResourceBytesForScale(resource_id, scale_factor));
 116
 117     if (!data.get()) {
 118       LOG(WARNING) << "Unable to load image with id " << resource_id;
 119       return GetEmptyImage();
 120     }
 121
 122     // Create a data object from the raw bytes.
 123     base::scoped_nsobject<NSData> ns_data(
 124         [[NSData alloc] initWithBytes:data->front() length:data->size()]);
 125
 126     bool is_fallback = PNGContainsFallbackMarker(data->front(), data->size());
 127     // Create the image from the data.
 128     CGFloat target_scale = ui::GetScaleForScaleFactor(scale_factor);
 129     CGFloat source_scale = is_fallback ? 1.0 : target_scale;
 130     base::scoped_nsobject<UIImage> ui_image(
 131         [[UIImage alloc] initWithData:ns_data scale:source_scale]);
 132
 133     // If the image is a 1x fallback, scale it up to a full-size representation.
 134     if (is_fallback) {
 135       CGSize source_size = [ui_image size];
 136       CGSize target_size = CGSizeMake(source_size.width * target_scale,
 137                                       source_size.height * target_scale);
 138       base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
 139           CGColorSpaceCreateDeviceRGB());
 140       base::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
 141           NULL,
 142           target_size.width,
 143           target_size.height,
 144           8,
 145           target_size.width * 4,
 146           color_space,
 147           kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
 148
 149       CGRect target_rect = CGRectMake(0, 0,
 150                                       target_size.width, target_size.height);
 151       CGContextSetBlendMode(context, kCGBlendModeCopy);
 152       CGContextDrawImage(context, target_rect, [ui_image CGImage]);
 153
 154       base::ScopedCFTypeRef<CGImageRef> cg_image(
 155           CGBitmapContextCreateImage(context));
 156       ui_image.reset([[UIImage alloc] initWithCGImage:cg_image
 157                                                 scale:target_scale
 158                                           orientation:UIImageOrientationUp]);
 159     }
 160
 161     if (!ui_image.get()) {
 162       LOG(WARNING) << "Unable to load image with id " << resource_id;
 163       NOTREACHED();  // Want to assert in debug mode.
 164       return GetEmptyImage();
 165     }
 166
 167     // The gfx::Image takes ownership.
 168     image = gfx::Image(ui_image.release());
 169   }
 170
 171   base::AutoLock lock(*images_and_fonts_lock_);
 172
 173   // Another thread raced the load and has already cached the image.
 174   if (images_.count(resource_id))
 175     return images_[resource_id];
 176
 177   images_[resource_id] = image;
 178   return images_[resource_id];
 179 }
 180
 181 }  // namespace ui