16 bpp video stream capture, render and createImageBitmap(video) using (CPU) shared memory buffers

media/capture/video/video_capture_utils.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 "media/capture/video/blob_utils.h"
+#include "media/capture/video/video_capture_utils.h"
 
 #include "media/base/video_capture_types.h"
 #include "media/base/video_frame.h"
 #include "third_party/libyuv/include/libyuv.h"
 #include "third_party/skia/include/core/SkImage.h"
 #include "ui/gfx/codec/png_codec.h"
 
+#define FourCcMacro(f, o, u, r)                                            \
+  static_cast<unsigned>((static_cast<unsigned>(f) << 0)) |                 \
+      (static_cast<unsigned>(o) << 8) | (static_cast<unsigned>(u) << 16) | \
+      (static_cast<unsigned>(r) << 24)
+
 namespace media {
 
+static const unsigned kFourCcZ16 = FourCcMacro('Z', '1', '6', ' ');
+static const unsigned kFourCcINVZ = FourCcMacro('I', 'N', 'V', 'Z');
+static const unsigned kFourCcY16 = FourCcMacro('Y', '1', '6', ' ');
+
 mojom::BlobPtr Blobify(const uint8_t* buffer,
                        const uint32_t bytesused,
                        const VideoCaptureFormat& capture_format) {
   DCHECK(buffer);
   DCHECK(bytesused);
   DCHECK(capture_format.IsValid());
 
   const VideoPixelFormat pixel_format = capture_format.pixel_format;
   if (pixel_format == VideoPixelFormat::PIXEL_FORMAT_MJPEG) {
     mojom::BlobPtr blob = mojom::Blob::New();
@@ skipping 34 matching lines @@
   const bool result = gfx::PNGCodec::Encode(
       tmp_argb.get(), codec_color_format, frame_size, frame_size.width() * 4,
       true /* discard_transparency */, std::vector<gfx::PNGCodec::Comment>(),
       &blob->data);
   DCHECK(result);
 
   blob->mime_type = "image/png";
   return blob;
 }
 
+bool IsY16FormatFourCc(unsigned four) {
+  return four == kFourCcZ16 || four == kFourCcINVZ || four == kFourCcY16;
+}
+
 }  // namespace media