Initial version of Blimp BlobCache.

blimp/client/feature/compositor/decoding_image_generator.cc

Index: blimp/client/feature/compositor/decoding_image_generator.cc
diff --git a/blimp/client/feature/compositor/decoding_image_generator.cc b/blimp/client/feature/compositor/decoding_image_generator.cc
index 692dd373c4df152e1de69054ca0deef64b44f5bd..bf8305ea5f650d56829cce537a1f2234d084007b 100644
--- a/blimp/client/feature/compositor/decoding_image_generator.cc
+++ b/blimp/client/feature/compositor/decoding_image_generator.cc
@@ -4,7 +4,9 @@
 
 #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"
@@ -13,6 +15,16 @@ 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);