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/files/file_path.h"
12#include "base/files/file_util.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
22namespace ui {
23
24namespace {
25
26base::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
46void 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  // TODO(rohitrao): Add a chrome_300_percent file and load it here.  For now,
61  // we are simply falling back to the 200P resources. http://crbug.com/413300.
62  if (IsScaleFactorSupported(SCALE_FACTOR_300P)) {
63    AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_200_percent", nil),
64                        SCALE_FACTOR_200P);
65  }
66}
67
68base::FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
69                                                 bool test_file_exists) {
70  NSString* mac_locale = base::SysUTF8ToNSString(app_locale);
71
72  // iOS uses "_" instead of "-", so swap to get a iOS-style value.
73  mac_locale = [mac_locale stringByReplacingOccurrencesOfString:@"-"
74                                                     withString:@"_"];
75
76  // On disk, the "en_US" resources are just "en" (http://crbug.com/25578).
77  if ([mac_locale isEqual:@"en_US"])
78    mac_locale = @"en";
79
80  base::FilePath locale_file_path =
81      GetResourcesPakFilePath(@"locale", mac_locale);
82
83  if (delegate_) {
84    locale_file_path =
85        delegate_->GetPathForLocalePack(locale_file_path, app_locale);
86  }
87
88  // Don't try to load empty values or values that are not absolute paths.
89  if (locale_file_path.empty() || !locale_file_path.IsAbsolute())
90    return base::FilePath();
91
92  if (test_file_exists && !base::PathExists(locale_file_path))
93    return base::FilePath();
94
95  return locale_file_path;
96}
97
98gfx::Image& ResourceBundle::GetNativeImageNamed(int resource_id, ImageRTL rtl) {
99  // Flipped images are not used on iOS.
100  DCHECK_EQ(rtl, RTL_DISABLED);
101
102  // Check to see if the image is already in the cache.
103  {
104    base::AutoLock lock(*images_and_fonts_lock_);
105    ImageMap::iterator found = images_.find(resource_id);
106    if (found != images_.end()) {
107      return found->second;
108    }
109  }
110
111  gfx::Image image;
112  if (delegate_)
113    image = delegate_->GetNativeImageNamed(resource_id, rtl);
114
115  if (image.IsEmpty()) {
116    // Load the raw data from the resource pack at the current supported scale
117    // factor.  This code assumes that only one of the possible scale factors is
118    // supported at runtime, based on the device resolution.
119    ui::ScaleFactor scale_factor = GetMaxScaleFactor();
120
121    scoped_refptr<base::RefCountedStaticMemory> data(
122        LoadDataResourceBytesForScale(resource_id, scale_factor));
123
124    if (!data.get()) {
125      LOG(WARNING) << "Unable to load image with id " << resource_id;
126      return GetEmptyImage();
127    }
128
129    // Create a data object from the raw bytes.
130    base::scoped_nsobject<NSData> ns_data(
131        [[NSData alloc] initWithBytes:data->front() length:data->size()]);
132
133    bool is_fallback = PNGContainsFallbackMarker(data->front(), data->size());
134    // Create the image from the data.
135    CGFloat target_scale = ui::GetScaleForScaleFactor(scale_factor);
136    // Hack: The 200P pak file is the only pak file loaded on iOS devices with
137    // an @3x scale factor.  Force |source_scale| to be 2.0 to handle this case,
138    // since it cannot be anything else.  http://crbug.com/413300.
139    // TODO(rohitrao): Support proper fallback by using the actual scale factor
140    // of the source image, rather than assuming it is 1.0 or 2.0.
141    CGFloat source_scale = target_scale;
142    if (is_fallback) {
143      source_scale = 1.0;
144    } else if (scale_factor == SCALE_FACTOR_300P) {
145      source_scale = 2.0;
146    }
147    base::scoped_nsobject<UIImage> ui_image(
148        [[UIImage alloc] initWithData:ns_data scale:source_scale]);
149
150    // If the image is a 1x fallback, scale it up to a full-size representation.
151    if (is_fallback) {
152      CGSize source_size = [ui_image size];
153      CGSize target_size = CGSizeMake(source_size.width * target_scale,
154                                      source_size.height * target_scale);
155      base::ScopedCFTypeRef<CGColorSpaceRef> color_space(
156          CGColorSpaceCreateDeviceRGB());
157      base::ScopedCFTypeRef<CGContextRef> context(CGBitmapContextCreate(
158          NULL,
159          target_size.width,
160          target_size.height,
161          8,
162          target_size.width * 4,
163          color_space,
164          kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
165
166      CGRect target_rect = CGRectMake(0, 0,
167                                      target_size.width, target_size.height);
168      CGContextSetBlendMode(context, kCGBlendModeCopy);
169      CGContextDrawImage(context, target_rect, [ui_image CGImage]);
170
171      base::ScopedCFTypeRef<CGImageRef> cg_image(
172          CGBitmapContextCreateImage(context));
173      ui_image.reset([[UIImage alloc] initWithCGImage:cg_image
174                                                scale:target_scale
175                                          orientation:UIImageOrientationUp]);
176    }
177
178    if (!ui_image.get()) {
179      LOG(WARNING) << "Unable to load image with id " << resource_id;
180      NOTREACHED();  // Want to assert in debug mode.
181      return GetEmptyImage();
182    }
183
184    // The gfx::Image takes ownership.
185    image = gfx::Image(ui_image.release());
186  }
187
188  base::AutoLock lock(*images_and_fonts_lock_);
189
190  // Another thread raced the load and has already cached the image.
191  if (images_.count(resource_id))
192    return images_[resource_id];
193
194  images_[resource_id] = image;
195  return images_[resource_id];
196}
197
198}  // namespace ui
199