Initial version of Blimp BlobCache.

blimp/client/feature/compositor/decoding_image_generator.cc

 // 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 "blimp/client/feature/compositor/decoding_image_generator.h"
 
+#include "base/numerics/safe_conversions.h"
 #include "blimp/common/compositor/webp_decoder.h"
+#include "blimp/common/proto/blob_cache.pb.h"
 #include "third_party/libwebp/webp/decode.h"
 #include "third_party/libwebp/webp/demux.h"
 #include "third_party/skia/include/core/SkData.h"
 
 namespace blimp {
 namespace client {
 
 SkImageGenerator* DecodingImageGenerator::create(SkData* data) {
+  // Check if this is a cache identifier instead of a WebP image.

[Kevin M, 2016/04/13 23:29:52]

Can you add a prefix byte instead of trying to parse?

[nyquist, 2016/04/14 19:33:22]

Moved all of this to a proto instead.

+  std::unique_ptr<BlobCacheImageIdentifier> deserialized(
+      new BlobCacheImageIdentifier);
+  int signed_size = base::checked_cast<int>(data->size());
+  if (deserialized->ParseFromArray(data->data(), signed_size)) {
+    const SkImageInfo info = SkImageInfo::MakeN32Premul(deserialized->width(),
+                                                        deserialized->height());
+    return new DecodingImageGenerator(info, data->data(), data->size());
+  }
+
   WebPData inputData = {reinterpret_cast<const uint8_t*>(data->data()),
                         data->size()};
   WebPDemuxState demuxState(WEBP_DEMUX_PARSING_HEADER);
   WebPDemuxer* demux = WebPDemuxPartial(&inputData, &demuxState);
 
   uint32_t width = WebPDemuxGetI(demux, WEBP_FF_CANVAS_WIDTH);
   uint32_t height = WebPDemuxGetI(demux, WEBP_FF_CANVAS_HEIGHT);
 
   const SkImageInfo info = SkImageInfo::MakeN32Premul(width, height);
   return new DecodingImageGenerator(info, data->data(), data->size());
@@ skipping 26 matching lines @@
   return false;
 }
 
 bool DecodingImageGenerator::onGetYUV8Planes(const SkYUVSizeInfo& sizeInfo,
                                              void* planes[3]) {
   return false;
 }
 
 }  // namespace client
 }  // namespace blimp