1 files changed, 148 insertions, 0 deletions
diff --git a/dom/media/ImageToI420.cpp b/dom/media/ImageToI420.cpp
new file mode 100644
index 0000000000..8fc5198b4a
--- /dev/null
+++ b/dom/media/ImageToI420.cpp
@@ -0,0 +1,148 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ImageToI420.h"
+
+#include "ImageContainer.h"
+#include "libyuv/convert.h"
+#include "mozilla/dom/ImageBitmapBinding.h"
+#include "mozilla/dom/ImageUtils.h"
+#include "mozilla/gfx/Point.h"
+#include "mozilla/RefPtr.h"
+#include "nsThreadUtils.h"
+
+using mozilla::ImageFormat;
+using mozilla::dom::ImageBitmapFormat;
+using mozilla::dom::ImageUtils;
+using mozilla::gfx::DataSourceSurface;
+using mozilla::gfx::SourceSurface;
+using mozilla::gfx::SurfaceFormat;
+using mozilla::layers::Image;
+using mozilla::layers::PlanarYCbCrData;
+using mozilla::layers::PlanarYCbCrImage;
+
+static const PlanarYCbCrData* GetPlanarYCbCrData(Image* aImage) {
+  switch (aImage->GetFormat()) {
+    case ImageFormat::PLANAR_YCBCR:
+      return aImage->AsPlanarYCbCrImage()->GetData();
+    case ImageFormat::NV_IMAGE:
+      return aImage->AsNVImage()->GetData();
+    default:
+      return nullptr;
+  }
+}
+
+static already_AddRefed<SourceSurface> GetSourceSurface(Image* aImage) {
+  if (!aImage->AsGLImage() || NS_IsMainThread()) {
+    return aImage->GetAsSourceSurface();
+  }
+
+  // GLImage::GetAsSourceSurface() only supports main thread
+  RefPtr<SourceSurface> surf;
+  NS_DispatchAndSpinEventLoopUntilComplete(
+      "ImageToI420::GLImage::GetSourceSurface"_ns,
+      mozilla::GetMainThreadSerialEventTarget(),
+      NS_NewRunnableFunction(
+          "ImageToI420::GLImage::GetSourceSurface",
+          [&aImage, &surf]() { surf = aImage->GetAsSourceSurface(); }));
+
+  return surf.forget();
+}
+
+static nsresult MapRv(int aRv) {
+  // Docs for libyuv::ConvertToI420 say:
+  // Returns 0 for successful; -1 for invalid parameter. Non-zero for failure.
+  switch (aRv) {
+    case 0:
+      return NS_OK;
+    case -1:
+      return NS_ERROR_INVALID_ARG;
+    default:
+      return NS_ERROR_FAILURE;
+  }
+}
+
+namespace mozilla {
+
+nsresult ConvertToI420(Image* aImage, uint8_t* aDestY, int aDestStrideY,
+                       uint8_t* aDestU, int aDestStrideU, uint8_t* aDestV,
+                       int aDestStrideV) {
+  if (!aImage->IsValid()) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  if (const PlanarYCbCrData* data = GetPlanarYCbCrData(aImage)) {
+    const ImageUtils imageUtils(aImage);
+    switch (imageUtils.GetFormat()) {
+      case ImageBitmapFormat::YUV420P:
+        return MapRv(libyuv::I420ToI420(
+            data->mYChannel, data->mYStride, data->mCbChannel,
+            data->mCbCrStride, data->mCrChannel, data->mCbCrStride, aDestY,
+            aDestStrideY, aDestU, aDestStrideU, aDestV, aDestStrideV,
+            aImage->GetSize().width, aImage->GetSize().height));
+      case ImageBitmapFormat::YUV422P:
+        return MapRv(libyuv::I422ToI420(
+            data->mYChannel, data->mYStride, data->mCbChannel,
+            data->mCbCrStride, data->mCrChannel, data->mCbCrStride, aDestY,
+            aDestStrideY, aDestU, aDestStrideU, aDestV, aDestStrideV,
+            aImage->GetSize().width, aImage->GetSize().height));
+      case ImageBitmapFormat::YUV444P:
+        return MapRv(libyuv::I444ToI420(
+            data->mYChannel, data->mYStride, data->mCbChannel,
+            data->mCbCrStride, data->mCrChannel, data->mCbCrStride, aDestY,
+            aDestStrideY, aDestU, aDestStrideU, aDestV, aDestStrideV,
+            aImage->GetSize().width, aImage->GetSize().height));
+      case ImageBitmapFormat::YUV420SP_NV12:
+        return MapRv(libyuv::NV12ToI420(
+            data->mYChannel, data->mYStride, data->mCbChannel,
+            data->mCbCrStride, aDestY, aDestStrideY, aDestU, aDestStrideU,
+            aDestV, aDestStrideV, aImage->GetSize().width,
+            aImage->GetSize().height));
+      case ImageBitmapFormat::YUV420SP_NV21:
+        return MapRv(libyuv::NV21ToI420(
+            data->mYChannel, data->mYStride, data->mCrChannel,
+            data->mCbCrStride, aDestY, aDestStrideY, aDestU, aDestStrideU,
+            aDestV, aDestStrideV, aImage->GetSize().width,
+            aImage->GetSize().height));
+      default:
+        MOZ_ASSERT_UNREACHABLE("YUV format conversion not implemented");
+        return NS_ERROR_NOT_IMPLEMENTED;
+    }
+  }
+
+  RefPtr<SourceSurface> surf = GetSourceSurface(aImage);
+  if (!surf) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<DataSourceSurface> data = surf->GetDataSurface();
+  if (!data) {
+    return NS_ERROR_FAILURE;
+  }
+
+  DataSourceSurface::ScopedMap map(data, DataSourceSurface::READ);
+  if (!map.IsMapped()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  switch (surf->GetFormat()) {
+    case SurfaceFormat::B8G8R8A8:
+    case SurfaceFormat::B8G8R8X8:
+      return MapRv(libyuv::ARGBToI420(
+          static_cast<uint8_t*>(map.GetData()), map.GetStride(), aDestY,
+          aDestStrideY, aDestU, aDestStrideU, aDestV, aDestStrideV,
+          aImage->GetSize().width, aImage->GetSize().height));
+    case SurfaceFormat::R5G6B5_UINT16:
+      return MapRv(libyuv::RGB565ToI420(
+          static_cast<uint8_t*>(map.GetData()), map.GetStride(), aDestY,
+          aDestStrideY, aDestU, aDestStrideU, aDestV, aDestStrideV,
+          aImage->GetSize().width, aImage->GetSize().height));
+    default:
+      MOZ_ASSERT_UNREACHABLE("Surface format conversion not implemented");
+      return NS_ERROR_NOT_IMPLEMENTED;
+  }
+}
+
+}  // namespace mozilla