| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "chrome/utility/image_decoder_impl.h" |
| |
| #include <string.h> |
| |
| #include <utility> |
| |
| #include "base/logging.h" |
| #include "content/public/child/image_decoder_utils.h" |
| #include "ipc/ipc_channel.h" |
| #include "mojo/public/cpp/bindings/strong_binding.h" |
| #include "skia/ext/image_operations.h" |
| #include "third_party/skia/include/core/SkBitmap.h" |
| #include "ui/gfx/geometry/size.h" |
| |
| #if defined(OS_CHROMEOS) |
| #include "ui/gfx/chromeos/codec/jpeg_codec_robust_slow.h" |
| #include "ui/gfx/codec/png_codec.h" |
| #endif |
| |
| namespace { |
| int64_t kMaxMessageSize = IPC::Channel::kMaximumMessageSize; |
| int64_t kPadding = 64; |
| } |
| |
| ImageDecoderImpl::ImageDecoderImpl() : ImageDecoderImpl(kMaxMessageSize) {} |
| |
| ImageDecoderImpl::ImageDecoderImpl(int64_t max_message_size) |
| : max_message_size_(max_message_size) {} |
| |
| ImageDecoderImpl::~ImageDecoderImpl() { |
| } |
| |
| void ImageDecoderImpl::DecodeImage( |
| mojo::Array<uint8_t> encoded_data, |
| mojom::ImageCodec codec, |
| bool shrink_to_fit, |
| const DecodeImageCallback& callback) { |
| if (encoded_data.size() == 0) { |
| callback.Run(SkBitmap()); |
| return; |
| } |
| |
| SkBitmap decoded_image; |
| #if defined(OS_CHROMEOS) |
| if (codec == mojom::ImageCodec::ROBUST_JPEG) { |
| // Our robust jpeg decoding is using IJG libjpeg. |
| if (encoded_data.size()) { |
| std::unique_ptr<SkBitmap> decoded_jpeg(gfx::JPEGCodecRobustSlow::Decode( |
| encoded_data.storage().data(), encoded_data.size())); |
| if (decoded_jpeg.get() && !decoded_jpeg->empty()) |
| decoded_image = *decoded_jpeg; |
| } |
| } else if (codec == mojom::ImageCodec::ROBUST_PNG) { |
| // Our robust PNG decoding is using libpng. |
| if (encoded_data.size()) { |
| SkBitmap decoded_png; |
| if (gfx::PNGCodec::Decode(encoded_data.storage().data(), |
| encoded_data.size(), &decoded_png)) { |
| decoded_image = decoded_png; |
| } |
| } |
| } |
| #endif // defined(OS_CHROMEOS) |
| if (codec == mojom::ImageCodec::DEFAULT) { |
| decoded_image = content::DecodeImage(encoded_data.storage().data(), |
| gfx::Size(), encoded_data.size()); |
| } |
| |
| if (!decoded_image.isNull()) { |
| // When serialized, the space taken up by a skia::mojom::Bitmap excluding |
| // the pixel data payload should be: |
| // sizeof(skia::mojom::Bitmap::Data_) + pixel data array header (8 bytes) |
| // Use a bigger number in case we need padding at the end. |
| int64_t struct_size = sizeof(skia::mojom::Bitmap::Data_) + kPadding; |
| int64_t image_size = decoded_image.computeSize64(); |
| int halves = 0; |
| while (struct_size + (image_size >> 2 * halves) > max_message_size_) |
| halves++; |
| if (halves) { |
| if (shrink_to_fit) { |
| // If decoded image is too large for IPC message, shrink it by halves. |
| // This prevents quality loss, and should never overshrink on displays |
| // smaller than 3600x2400. |
| // TODO (Issue 416916): Instead of shrinking, return via shared memory |
| decoded_image = skia::ImageOperations::Resize( |
| decoded_image, skia::ImageOperations::RESIZE_LANCZOS3, |
| decoded_image.width() >> halves, decoded_image.height() >> halves); |
| } else { |
| decoded_image.reset(); |
| } |
| } |
| } |
| |
| callback.Run(decoded_image); |
| } |