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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 
     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 
     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
     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 
     60 UserImage::UserImage()
     61     : has_raw_image_(false),
     62       has_animated_image_(false),
     63       is_safe_format_(false) {
     64 }
     65 
     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 
     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 
     92 UserImage::~UserImage() {}
     93 
     94 void UserImage::DiscardRawImage() {
     95   RawImage().swap(raw_image_);  // Clear |raw_image_|.
     96 }
     97 
     98 void UserImage::MarkAsSafe() {
     99   is_safe_format_ = true;
    100 }
    101 
    102 }  // namespace chromeos
    103