1 files changed, 250 insertions, 0 deletions
diff --git a/gfx/layers/MacIOSurfaceImage.cpp b/gfx/layers/MacIOSurfaceImage.cpp
new file mode 100644
index 0000000000..08163321b7
--- /dev/null
+++ b/gfx/layers/MacIOSurfaceImage.cpp
@@ -0,0 +1,250 @@
+/* -*- 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 "mozilla/Unused.h"
+#include "YCbCrUtils.h"
+
+using namespace mozilla::layers;
+using namespace mozilla::gfx;
+
+TextureClient* MacIOSurfaceImage::GetTextureClient(
+    KnowsCompositor* aKnowsCompositor) {
+  if (!mTextureClient) {
+    BackendType backend = BackendType::NONE;
+    TextureFlags flags =
+        IsDRM() ? TextureFlags::DRM_SOURCE : TextureFlags::DEFAULT;
+    mTextureClient = TextureClient::CreateWithData(
+        MacIOSurfaceTextureData::Create(mSurface, backend), flags,
+        aKnowsCompositor->GetTextureForwarder());
+  }
+  return mTextureClient;
+}
+
+ColorDepth MacIOSurfaceImage::GetColorDepth() const {
+  if (!mSurface) {
+    return gfx::ColorDepth::COLOR_8;
+  }
+  return mSurface->GetColorDepth();
+}
+
+already_AddRefed<SourceSurface> MacIOSurfaceImage::GetAsSourceSurface() {
+  return CreateSourceSurfaceFromMacIOSurface(mSurface);
+}
+
+static inline uint16_t safeShift10BitBy6(const uint16_t& a10BitLSB) {
+  // a10BitLSB is a 10-bit value packed into the least significant bits of
+  // a 16 bit value. This function asserts that the 6 MSBs are zero, then
+  // shifts the 10 LSBs by 6 to become the MSBs.
+  MOZ_ASSERT((a10BitLSB & 0b1111'1100'0000'0000) == 0);
+  return a10BitLSB << 6;
+}
+
+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.mYUVColorSpace == YUVColorSpace::BT2020) ||
+      !(aData.mColorRange == ColorRange::FULL ||
+        aData.mColorRange == ColorRange::LIMITED) ||
+      !(aData.mColorDepth == ColorDepth::COLOR_8 ||
+        aData.mColorDepth == ColorDepth::COLOR_10)) {
+    return false;
+  }
+
+  // We can only support 4:2:2 and 4:2:0 formats currently.
+  switch (aData.mChromaSubsampling) {
+    case ChromaSubsampling::HALF_WIDTH:
+    case ChromaSubsampling::HALF_WIDTH_AND_HEIGHT:
+      break;
+    default:
+      return false;
+  }
+
+  RefPtr<MacIOSurfaceRecycleAllocator> allocator =
+      aContainer->GetMacIOSurfaceRecycleAllocator();
+
+  auto ySize = aData.YDataSize();
+  auto cbcrSize = aData.CbCrDataSize();
+  RefPtr<MacIOSurface> surf = allocator->Allocate(
+      ySize, cbcrSize, aData.mYUVColorSpace, aData.mTransferFunction,
+      aData.mColorRange, aData.mColorDepth);
+
+  surf->Lock(false);
+
+  if (surf->GetFormat() == SurfaceFormat::YUV422) {
+    // 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 = ySize.height / cbcrSize.height;
+
+    // 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(ySize.height > 0);
+    uint8_t* dst = (uint8_t*)surf->GetBaseAddressOfPlane(0);
+    size_t stride = surf->GetBytesPerRow(0);
+    for (size_t i = 0; i < (size_t)ySize.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)cbcrSize.width; j++) {
+        *rowDst = *rowYSrc;
+        rowDst++;
+        rowYSrc++;
+
+        *rowDst = *rowCbSrc;
+        rowDst++;
+        rowCbSrc++;
+
+        *rowDst = *rowYSrc;
+        rowDst++;
+        rowYSrc++;
+
+        *rowDst = *rowCrSrc;
+        rowDst++;
+        rowCrSrc++;
+      }
+    }
+  } else if (surf->GetFormat() == SurfaceFormat::NV12) {
+    MOZ_ASSERT(ySize.height > 0);
+    uint8_t* dst = (uint8_t*)surf->GetBaseAddressOfPlane(0);
+    size_t stride = surf->GetBytesPerRow(0);
+    for (size_t i = 0; i < (size_t)ySize.height; i++) {
+      uint8_t* rowSrc = aData.mYChannel + aData.mYStride * i;
+      uint8_t* rowDst = dst + stride * i;
+      memcpy(rowDst, rowSrc, ySize.width);
+    }
+
+    // Copy and interleave the Cb and Cr channels.
+    MOZ_ASSERT(cbcrSize.height > 0);
+    dst = (uint8_t*)surf->GetBaseAddressOfPlane(1);
+    stride = surf->GetBytesPerRow(1);
+    for (size_t i = 0; i < (size_t)cbcrSize.height; i++) {
+      uint8_t* rowCbSrc = aData.mCbChannel + aData.mCbCrStride * i;
+      uint8_t* rowCrSrc = aData.mCrChannel + aData.mCbCrStride * i;
+      uint8_t* rowDst = dst + stride * i;
+
+      for (size_t j = 0; j < (size_t)cbcrSize.width; j++) {
+        *rowDst = *rowCbSrc;
+        rowDst++;
+        rowCbSrc++;
+
+        *rowDst = *rowCrSrc;
+        rowDst++;
+        rowCrSrc++;
+      }
+    }
+  } else if (surf->GetFormat() == SurfaceFormat::P010) {
+    MOZ_ASSERT(ySize.height > 0);
+    auto dst = reinterpret_cast<uint16_t*>(surf->GetBaseAddressOfPlane(0));
+    size_t stride = surf->GetBytesPerRow(0) / 2;
+    for (size_t i = 0; i < (size_t)ySize.height; i++) {
+      auto rowSrc = reinterpret_cast<const uint16_t*>(aData.mYChannel +
+                                                      aData.mYStride * i);
+      auto rowDst = dst + stride * i;
+
+      for (const auto j : IntegerRange(ySize.width)) {
+        Unused << j;
+
+        *rowDst = safeShift10BitBy6(*rowSrc);
+        rowDst++;
+        rowSrc++;
+      }
+    }
+
+    // Copy and interleave the Cb and Cr channels.
+    MOZ_ASSERT(cbcrSize.height > 0);
+    dst = (uint16_t*)surf->GetBaseAddressOfPlane(1);
+    stride = surf->GetBytesPerRow(1) / 2;
+    for (size_t i = 0; i < (size_t)cbcrSize.height; i++) {
+      uint16_t* rowCbSrc =
+          (uint16_t*)(aData.mCbChannel + aData.mCbCrStride * i);
+      uint16_t* rowCrSrc =
+          (uint16_t*)(aData.mCrChannel + aData.mCbCrStride * i);
+      uint16_t* rowDst = dst + stride * i;
+
+      for (const auto j : IntegerRange(cbcrSize.width)) {
+        Unused << j;
+
+        *rowDst = safeShift10BitBy6(*rowCbSrc);
+        rowDst++;
+        rowCbSrc++;
+
+        *rowDst = safeShift10BitBy6(*rowCrSrc);
+        rowDst++;
+        rowCrSrc++;
+      }
+    }
+  }
+
+  surf->Unlock(false);
+  mSurface = surf;
+  mPictureRect = aData.mPictureRect;
+  return true;
+}
+
+already_AddRefed<MacIOSurface> MacIOSurfaceRecycleAllocator::Allocate(
+    const gfx::IntSize aYSize, const gfx::IntSize& aCbCrSize,
+    gfx::YUVColorSpace aYUVColorSpace, gfx::TransferFunction aTransferFunction,
+    gfx::ColorRange aColorRange, gfx::ColorDepth aColorDepth) {
+  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, false, aYUVColorSpace);
+    }
+
+    mSurfaces.AppendElement(surf);
+  }
+
+  if (!result) {
+    if (StaticPrefs::layers_iosurfaceimage_use_nv12_AtStartup()) {
+      result = MacIOSurface::CreateNV12OrP010Surface(
+          aYSize, aCbCrSize, aYUVColorSpace, aTransferFunction, aColorRange,
+          aColorDepth);
+    } else {
+      result = MacIOSurface::CreateYUV422Surface(aYSize, aYUVColorSpace,
+                                                 aColorRange);
+    }
+
+    if (mSurfaces.Length() <
+        StaticPrefs::layers_iosurfaceimage_recycle_limit()) {
+      mSurfaces.AppendElement(result->GetIOSurfaceRef());
+    }
+  }
+
+  return result.forget();
+}