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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/chromeos/login/user_image.h"
6  
7  #include "third_party/skia/include/core/SkBitmap.h"
8  #include "ui/gfx/codec/jpeg_codec.h"
9  
10  #include "base/debug/trace_event.h"
11  
12  namespace chromeos {
13  
14  namespace {
15  
16  // Default quality for encoding user images.
17  const int kDefaultEncodingQuality = 90;
18  
IsAnimatedImage(const UserImage::RawImage & data)19  bool IsAnimatedImage(const UserImage::RawImage& data) {
20    const char kGIFStamp[] = "GIF";
21    const size_t kGIFStampLength = sizeof(kGIFStamp) - 1;
22  
23    if (data.size() >= kGIFStampLength &&
24        memcmp(&data[0], kGIFStamp, kGIFStampLength) == 0) {
25      return true;
26    }
27    return false;
28  }
29  
EncodeImageSkia(const gfx::ImageSkia & image,std::vector<unsigned char> * output)30  bool EncodeImageSkia(const gfx::ImageSkia& image,
31                       std::vector<unsigned char>* output) {
32    TRACE_EVENT2("oobe", "EncodeImageSkia",
33                 "width", image.width(), "height", image.height());
34    if (image.isNull())
35      return false;
36    const SkBitmap& bitmap = *image.bitmap();
37    SkAutoLockPixels lock_image(bitmap);
38    return gfx::JPEGCodec::Encode(
39        reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
40        gfx::JPEGCodec::FORMAT_SkBitmap,
41        bitmap.width(),
42        bitmap.height(),
43        bitmap.width() * bitmap.bytesPerPixel(),
44        kDefaultEncodingQuality, output);
45  }
46  
47  }  // namespace
48  
49  // static
CreateAndEncode(const gfx::ImageSkia & image)50  UserImage UserImage::CreateAndEncode(const gfx::ImageSkia& image) {
51    RawImage raw_image;
52    if (EncodeImageSkia(image, &raw_image)) {
53      UserImage result(image, raw_image);
54      result.MarkAsSafe();
55      return result;
56    }
57    return UserImage(image);
58  }
59  
UserImage()60  UserImage::UserImage()
61      : has_raw_image_(false),
62        has_animated_image_(false),
63        is_safe_format_(false) {
64  }
65  
UserImage(const gfx::ImageSkia & image)66  UserImage::UserImage(const gfx::ImageSkia& image)
67      : image_(image),
68        has_raw_image_(false),
69        has_animated_image_(false),
70        is_safe_format_(false) {
71  }
72  
UserImage(const gfx::ImageSkia & image,const RawImage & raw_image)73  UserImage::UserImage(const gfx::ImageSkia& image,
74                       const RawImage& raw_image)
75      : image_(image),
76        has_raw_image_(false),
77        has_animated_image_(false),
78        is_safe_format_(false) {
79    if (IsAnimatedImage(raw_image)) {
80      has_animated_image_ = true;
81      animated_image_ = raw_image;
82      if (EncodeImageSkia(image_, &raw_image_)) {
83        has_raw_image_ = true;
84        MarkAsSafe();
85      }
86    } else {
87      has_raw_image_ = true;
88      raw_image_ = raw_image;
89    }
90  }
91  
~UserImage()92  UserImage::~UserImage() {}
93  
DiscardRawImage()94  void UserImage::DiscardRawImage() {
95    RawImage().swap(raw_image_);  // Clear |raw_image_|.
96  }
97  
MarkAsSafe()98  void UserImage::MarkAsSafe() {
99    is_safe_format_ = true;
100  }
101  
102  }  // namespace chromeos
103