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1 // Copyright 2016 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 "services/image_decoder/image_decoder_impl.h" | |
6 | |
7 #include <string.h> | |
8 | |
9 #include <utility> | |
10 | |
11 #include "base/logging.h" | |
12 #include "content/public/child/image_decoder_utils.h" | |
13 #include "mojo/public/cpp/bindings/strong_binding.h" | |
14 #include "skia/ext/image_operations.h" | |
15 #include "third_party/skia/include/core/SkBitmap.h" | |
16 | |
17 #if defined(OS_CHROMEOS) | |
18 #include "ui/gfx/codec/chromeos/jpeg_codec_robust_slow.h" | |
19 #include "ui/gfx/codec/png_codec.h" | |
20 #endif | |
21 | |
22 namespace image_decoder { | |
23 | |
24 namespace { | |
25 | |
26 int64_t kPadding = 64; | |
27 | |
28 } // namespace | |
29 | |
30 ImageDecoderImpl::ImageDecoderImpl( | |
31 std::unique_ptr<service_manager::ServiceContextRef> service_ref) | |
32 : service_ref_(std::move(service_ref)) {} | |
33 | |
34 ImageDecoderImpl::~ImageDecoderImpl() = default; | |
35 | |
36 void ImageDecoderImpl::DecodeImage(const std::vector<uint8_t>& encoded_data, | |
37 mojom::ImageCodec codec, | |
38 bool shrink_to_fit, | |
39 int64_t max_size_in_bytes, | |
40 const gfx::Size& desired_image_frame_size, | |
41 const DecodeImageCallback& callback) { | |
42 if (encoded_data.size() == 0) { | |
43 callback.Run(SkBitmap()); | |
44 return; | |
45 } | |
46 | |
47 SkBitmap decoded_image; | |
48 #if defined(OS_CHROMEOS) | |
49 if (codec == mojom::ImageCodec::ROBUST_JPEG) { | |
50 // Our robust jpeg decoding is using IJG libjpeg. | |
51 if (encoded_data.size()) { | |
52 std::unique_ptr<SkBitmap> decoded_jpeg(gfx::JPEGCodecRobustSlow::Decode( | |
53 encoded_data.data(), encoded_data.size())); | |
54 if (decoded_jpeg.get() && !decoded_jpeg->empty()) | |
55 decoded_image = *decoded_jpeg; | |
56 } | |
57 } else if (codec == mojom::ImageCodec::ROBUST_PNG) { | |
58 // Our robust PNG decoding is using libpng. | |
59 if (encoded_data.size()) { | |
60 SkBitmap decoded_png; | |
61 if (gfx::PNGCodec::Decode( | |
62 encoded_data.data(), encoded_data.size(), &decoded_png)) { | |
63 decoded_image = decoded_png; | |
64 } | |
65 } | |
66 } | |
67 #endif // defined(OS_CHROMEOS) | |
68 if (codec == mojom::ImageCodec::DEFAULT) { | |
69 decoded_image = content::DecodeImage( | |
70 encoded_data.data(), desired_image_frame_size, encoded_data.size()); | |
71 } | |
72 | |
73 if (!decoded_image.isNull()) { | |
74 // When serialized, the space taken up by a skia::mojom::Bitmap excluding | |
75 // the pixel data payload should be: | |
76 // sizeof(skia::mojom::Bitmap::Data_) + pixel data array header (8 bytes) | |
77 // Use a bigger number in case we need padding at the end. | |
78 int64_t struct_size = sizeof(skia::mojom::Bitmap::Data_) + kPadding; | |
79 int64_t image_size = decoded_image.computeSize64(); | |
80 int halves = 0; | |
81 while (struct_size + (image_size >> 2 * halves) > max_size_in_bytes) | |
82 halves++; | |
83 if (halves) { | |
84 // If the decoded image is too large, either discard it or shrink it. | |
85 // | |
86 // TODO(rockot): Also support exposing the bytes via shared memory for | |
87 // larger images. https://crbug.com/416916. | |
88 if (shrink_to_fit) { | |
89 // Shrinking by halves prevents quality loss and should never overshrink | |
90 // on displays smaller than 3600x2400. | |
91 decoded_image = skia::ImageOperations::Resize( | |
92 decoded_image, skia::ImageOperations::RESIZE_LANCZOS3, | |
93 decoded_image.width() >> halves, decoded_image.height() >> halves); | |
94 } else { | |
95 decoded_image.reset(); | |
96 } | |
97 } | |
98 } | |
99 | |
100 callback.Run(decoded_image); | |
101 } | |
102 | |
103 } // namespace image_decoder | |
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