ImageCapture: Implement takePhoto() for Windows

media/capture/video/blob_utils.cc

Index: media/capture/video/blob_utils.cc
diff --git a/media/capture/video/blob_utils.cc b/media/capture/video/blob_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..54b622476c32055611c614c8c9960e8ed75faa23
--- /dev/null
+++ b/media/capture/video/blob_utils.cc
@@ -0,0 +1,69 @@
+// 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/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"
+
+namespace media {
+
+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();
+    blob->data.resize(bytesused);
+    memcpy(blob->data.data(), buffer, bytesused);
+    blob->mime_type = "image/jpeg";
+    return blob;
+  }
+
+  uint32_t src_format;
+  if (pixel_format == VideoPixelFormat::PIXEL_FORMAT_UYVY)
+    src_format = libyuv::FOURCC_UYVY;
+  else if (pixel_format == VideoPixelFormat::PIXEL_FORMAT_YUY2)
+    src_format = libyuv::FOURCC_YUY2;
+  else if (pixel_format == VideoPixelFormat::PIXEL_FORMAT_I420)
+    src_format = libyuv::FOURCC_I420;
+  else if (pixel_format == VideoPixelFormat::PIXEL_FORMAT_RGB24)
+    src_format = libyuv::FOURCC_24BG;
+  else
+    return nullptr;
+
+  const gfx::Size frame_size = capture_format.frame_size;
+  // PNGCodec does not support YUV formats, convert to a temporary ARGB buffer.
+  std::unique_ptr<uint8_t[]> tmp_argb(
+      new uint8_t[VideoFrame::AllocationSize(PIXEL_FORMAT_ARGB, frame_size)]);
+  if (ConvertToARGB(buffer, bytesused, tmp_argb.get(), frame_size.width() * 4,
+                    0 /* crop_x_pos */, 0 /* crop_y_pos */, frame_size.width(),
+                    frame_size.height(), frame_size.width(),
+                    frame_size.height(), libyuv::RotationMode::kRotate0,
+                    src_format) != 0) {
+    return nullptr;
+  }
+
+  mojom::BlobPtr blob = mojom::Blob::New();
+  const gfx::PNGCodec::ColorFormat codec_color_format =
+      (kN32_SkColorType == kRGBA_8888_SkColorType) ? gfx::PNGCodec::FORMAT_RGBA
+                                                   : gfx::PNGCodec::FORMAT_BGRA;
+  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;
+}
+
+}  // namespace media