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1 // Copyright 2015 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 #include "components/image_decoder/image_decoder_impl.h" | |
5 | |
6 #include <string.h> | |
7 | |
8 #include "base/logging.h" | |
9 #include "content/public/child/image_decoder_utils.h" | |
10 #include "ipc/ipc_channel.h" | |
11 #include "skia/ext/image_operations.h" | |
12 #include "skia/public/type_converters.h" | |
13 #include "third_party/skia/include/core/SkBitmap.h" | |
14 #include "ui/gfx/codec/jpeg_codec.h" | |
15 #include "ui/gfx/geometry/size.h" | |
16 | |
17 namespace image_decoder { | |
18 | |
19 namespace { | |
20 // TODO(amistry): Replace with more correct value. | |
Sam McNally
2015/05/06 06:41:39
According to https://code.google.com/p/chromium/co
Anand Mistry (off Chromium)
2015/05/06 07:14:23
Thanks.
| |
21 int64_t kMaxMessageSize = IPC::Channel::kMaximumMessageSize; | |
22 } | |
23 | |
24 ImageDecoderImpl::ImageDecoderImpl(int64_t max_message_size) | |
25 : max_message_size_(max_message_size), binding_(this) { | |
26 } | |
27 | |
28 ImageDecoderImpl::ImageDecoderImpl(mojo::InterfaceRequest<ImageDecoder> request) | |
29 : max_message_size_(kMaxMessageSize), binding_(this, request.Pass()) { | |
30 } | |
31 | |
32 ImageDecoderImpl::~ImageDecoderImpl() { | |
33 } | |
34 | |
35 void ImageDecoderImpl::DecodeImage( | |
36 mojo::Array<uint8_t> encoded_data, | |
37 ImageCodec codec, | |
38 bool shrink_to_fit, | |
39 const mojo::Callback<void(skia::BitmapPtr)>& callback) { | |
40 if (encoded_data.size() == 0) { | |
41 callback.Run(nullptr); | |
42 return; | |
43 } | |
44 | |
45 SkBitmap decoded_image; | |
46 if (codec == IMAGE_CODEC_ROBUST_JPEG) { | |
47 // Our robust jpeg decoding is using IJG libjpeg. | |
48 if (gfx::JPEGCodec::JpegLibraryVariant() == gfx::JPEGCodec::IJG_LIBJPEG && | |
49 encoded_data.size()) { | |
50 scoped_ptr<SkBitmap> decoded_jpeg( | |
51 gfx::JPEGCodec::Decode(&encoded_data[0], encoded_data.size())); | |
52 if (decoded_jpeg.get() && !decoded_jpeg->empty()) | |
53 decoded_image = *decoded_jpeg; | |
54 } | |
55 } else { | |
56 decoded_image = content::DecodeImage(&encoded_data[0], gfx::Size(), | |
57 encoded_data.size()); | |
58 } | |
59 | |
60 if (!decoded_image.isNull()) { | |
61 skia::BitmapPtr dummy_image = skia::Bitmap::New(); | |
62 int64_t struct_size = GetSerializedSize_(dummy_image); | |
63 int64_t image_size = decoded_image.computeSize64(); | |
64 int halves = 0; | |
65 while (struct_size + (image_size >> 2 * halves) > max_message_size_) | |
66 halves++; | |
67 if (halves) { | |
68 if (shrink_to_fit) { | |
69 // If decoded image is too large for IPC message, shrink it by halves. | |
70 // This prevents quality loss, and should never overshrink on displays | |
71 // smaller than 3600x2400. | |
72 // TODO (Issue 416916): Instead of shrinking, return via shared memory | |
73 decoded_image = skia::ImageOperations::Resize( | |
74 decoded_image, skia::ImageOperations::RESIZE_LANCZOS3, | |
75 decoded_image.width() >> halves, decoded_image.height() >> halves); | |
76 } else { | |
77 decoded_image.reset(); | |
78 } | |
79 } | |
80 } | |
81 | |
82 if (decoded_image.isNull()) | |
83 callback.Run(nullptr); | |
84 else | |
85 callback.Run(skia::Bitmap::From(decoded_image)); | |
86 } | |
87 | |
88 } // namespace image_decoder | |
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