resource_bundle_ios.mm revision 68043e1e95eeb07d5cae7aca370b26518b0867d6 
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
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
61base::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
91gfx::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::GetImageScale(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      if (ShouldHighlightMissingScaledResources()) {
155        CGContextSetFillColorSpace(context, color_space);
156        CGFloat components[4] = { 1.0, 0.0, 0.0, 0.3 };  // Translucent red.
157        CGContextSetFillColor(context, components);
158        CGContextSetBlendMode(context, kCGBlendModeNormal);
159        CGContextFillRect(context, target_rect);
160      }
161
162      base::ScopedCFTypeRef<CGImageRef> cg_image(
163          CGBitmapContextCreateImage(context));
164      ui_image.reset([[UIImage alloc] initWithCGImage:cg_image
165                                                scale:target_scale
166                                          orientation:UIImageOrientationUp]);
167    }
168
169    if (!ui_image.get()) {
170      LOG(WARNING) << "Unable to load image with id " << resource_id;
171      NOTREACHED();  // Want to assert in debug mode.
172      return GetEmptyImage();
173    }
174
175    // The gfx::Image takes ownership.
176    image = gfx::Image(ui_image.release());
177  }
178
179  base::AutoLock lock(*images_and_fonts_lock_);
180
181  // Another thread raced the load and has already cached the image.
182  if (images_.count(resource_id))
183    return images_[resource_id];
184
185  images_[resource_id] = image;
186  return images_[resource_id];
187}
188
189}  // namespace ui
190