1 files changed, 150 insertions, 0 deletions
diff --git a/gfx/layers/MacIOSurfaceImage.cpp b/gfx/layers/MacIOSurfaceImage.cpp
new file mode 100644
index 0000000000..8a155bc5cc
--- /dev/null
+++ b/gfx/layers/MacIOSurfaceImage.cpp
@@ -0,0 +1,150 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "MacIOSurfaceHelpers.h"
+#include "MacIOSurfaceImage.h"
+#include "gfxPlatform.h"
+#include "mozilla/layers/CompositableClient.h"
+#include "mozilla/layers/CompositableForwarder.h"
+#include "mozilla/layers/MacIOSurfaceTextureClientOGL.h"
+#include "mozilla/layers/TextureForwarder.h"
+#include "mozilla/StaticPrefs_layers.h"
+#include "mozilla/UniquePtr.h"
+#include "YCbCrUtils.h"
+
+using namespace mozilla::layers;
+using namespace mozilla::gfx;
+
+TextureClient* MacIOSurfaceImage::GetTextureClient(
+    KnowsCompositor* aKnowsCompositor) {
+  if (!mTextureClient) {
+    BackendType backend = BackendType::NONE;
+    mTextureClient = TextureClient::CreateWithData(
+        MacIOSurfaceTextureData::Create(mSurface, backend),
+        TextureFlags::DEFAULT, aKnowsCompositor->GetTextureForwarder());
+  }
+  return mTextureClient;
+}
+
+already_AddRefed<SourceSurface> MacIOSurfaceImage::GetAsSourceSurface() {
+  return CreateSourceSurfaceFromMacIOSurface(mSurface);
+}
+
+bool MacIOSurfaceImage::SetData(ImageContainer* aContainer,
+                                const PlanarYCbCrData& aData) {
+  MOZ_ASSERT(!mSurface);
+
+  if (aData.mYSkip != 0 || aData.mCbSkip != 0 || aData.mCrSkip != 0 ||
+      !(aData.mYUVColorSpace == YUVColorSpace::BT601 ||
+        aData.mYUVColorSpace == YUVColorSpace::BT709) ||
+      !(aData.mColorRange == ColorRange::FULL ||
+        aData.mColorRange == ColorRange::LIMITED) ||
+      aData.mColorDepth != ColorDepth::COLOR_8) {
+    return false;
+  }
+
+  if (aData.mCbCrSize.width * 2 != aData.mYSize.width) {
+    return false;
+  }
+
+  // We can only support 4:2:2 and 4:2:0 formats currently.
+  if (aData.mCbCrSize.height != aData.mYSize.height &&
+      aData.mCbCrSize.height * 2 != aData.mYSize.height) {
+    return false;
+  }
+
+  RefPtr<MacIOSurfaceRecycleAllocator> allocator =
+      aContainer->GetMacIOSurfaceRecycleAllocator();
+
+  RefPtr<MacIOSurface> surf = allocator->Allocate(
+      aData.mYSize, aData.mCbCrSize, aData.mYUVColorSpace, aData.mColorRange);
+
+  surf->Lock(false);
+
+  // If the CbCrSize's height is half of the YSize's height, then we'll
+  // need to duplicate the CbCr data on every second row.
+  size_t heightScale = aData.mYSize.height / aData.mCbCrSize.height;
+
+  MOZ_ASSERT(surf->GetFormat() == SurfaceFormat::YUV422);
+
+  // The underlying IOSurface has format kCVPixelFormatType_422YpCbCr8FullRange
+  // or kCVPixelFormatType_422YpCbCr8_yuvs, which uses a 4:2:2 Y`0 Cb Y`1 Cr
+  // layout. See CVPixelBuffer.h for the full list of format descriptions.
+  MOZ_ASSERT(aData.mYSize.height > 0);
+  uint8_t* dst = (uint8_t*)surf->GetBaseAddressOfPlane(0);
+  size_t stride = surf->GetBytesPerRow(0);
+  for (size_t i = 0; i < (size_t)aData.mYSize.height; i++) {
+    // Compute the row addresses. If the input was 4:2:0, then
+    // we divide i by 2, so that each source row of CbCr maps to
+    // two dest rows.
+    uint8_t* rowYSrc = aData.mYChannel + aData.mYStride * i;
+    uint8_t* rowCbSrc =
+        aData.mCbChannel + aData.mCbCrStride * (i / heightScale);
+    uint8_t* rowCrSrc =
+        aData.mCrChannel + aData.mCbCrStride * (i / heightScale);
+    uint8_t* rowDst = dst + stride * i;
+
+    // Iterate across the CbCr width (which we have guaranteed to be half of
+    // the surface width), and write two 16bit pixels each time.
+    for (size_t j = 0; j < (size_t)aData.mCbCrSize.width; j++) {
+      *rowDst = *rowYSrc;
+      rowDst++;
+      rowYSrc++;
+
+      *rowDst = *rowCbSrc;
+      rowDst++;
+      rowCbSrc++;
+
+      *rowDst = *rowYSrc;
+      rowDst++;
+      rowYSrc++;
+
+      *rowDst = *rowCrSrc;
+      rowDst++;
+      rowCrSrc++;
+    }
+  }
+
+  surf->Unlock(false);
+  mSurface = surf;
+  mPictureRect = aData.GetPictureRect();
+  return true;
+}
+
+already_AddRefed<MacIOSurface> MacIOSurfaceRecycleAllocator::Allocate(
+    const gfx::IntSize aYSize, const gfx::IntSize& aCbCrSize,
+    gfx::YUVColorSpace aYUVColorSpace, gfx::ColorRange aColorRange) {
+  nsTArray<CFTypeRefPtr<IOSurfaceRef>> surfaces = std::move(mSurfaces);
+  RefPtr<MacIOSurface> result;
+  for (auto& surf : surfaces) {
+    // If the surface size has changed, then discard any surfaces of the old
+    // size.
+    if (::IOSurfaceGetWidthOfPlane(surf.get(), 0) != (size_t)aYSize.width ||
+        ::IOSurfaceGetHeightOfPlane(surf.get(), 0) != (size_t)aYSize.height) {
+      continue;
+    }
+
+    // Only construct a MacIOSurface object when we find one that isn't
+    // in-use, since the constructor adds a usage ref.
+    if (!result && !::IOSurfaceIsInUse(surf.get())) {
+      result = new MacIOSurface(surf, 1.0, false, aYUVColorSpace);
+    }
+
+    mSurfaces.AppendElement(surf);
+  }
+
+  if (!result) {
+    result =
+        MacIOSurface::CreateYUV422Surface(aYSize, aYUVColorSpace, aColorRange);
+
+    if (mSurfaces.Length() <
+        StaticPrefs::layers_iosurfaceimage_recycle_limit()) {
+      mSurfaces.AppendElement(result->GetIOSurfaceRef());
+    }
+  }
+
+  return result.forget();
+}