1 files changed, 183 insertions, 0 deletions
diff --git a/gfx/layers/MacIOSurfaceHelpers.cpp b/gfx/layers/MacIOSurfaceHelpers.cpp
new file mode 100644
index 0000000000..55e85a73d2
--- /dev/null
+++ b/gfx/layers/MacIOSurfaceHelpers.cpp
@@ -0,0 +1,183 @@
+/* -*- 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 "libyuv.h"
+#include "MacIOSurfaceHelpers.h"
+#include "mozilla/gfx/MacIOSurface.h"
+#include "YCbCrUtils.h"
+
+namespace mozilla {
+
+using namespace gfx;
+
+namespace layers {
+
+#define ALIGNED_32(x) ((x + 31) & ~31)
+#define ALIGNEDPTR_32(x) \
+  reinterpret_cast<uint8_t*>((reinterpret_cast<uintptr_t>(x) + 31) & ~31)
+
+static already_AddRefed<SourceSurface>
+CreateSourceSurfaceFromLockedMacIOSurface(MacIOSurface* aSurface) {
+  size_t bytesPerRow = aSurface->GetBytesPerRow();
+  size_t ioWidth = aSurface->GetDevicePixelWidth();
+  size_t ioHeight = aSurface->GetDevicePixelHeight();
+  IntSize size((int32_t)ioWidth, (int32_t)ioHeight);
+  SurfaceFormat ioFormat = aSurface->GetFormat();
+
+  if ((ioFormat == SurfaceFormat::NV12 || ioFormat == SurfaceFormat::YUV422) &&
+      (ioWidth > PlanarYCbCrImage::MAX_DIMENSION ||
+       ioHeight > PlanarYCbCrImage::MAX_DIMENSION)) {
+    return nullptr;
+  }
+
+  SurfaceFormat format =
+      (ioFormat == SurfaceFormat::NV12 || ioFormat == SurfaceFormat::YUV422)
+          ? SurfaceFormat::B8G8R8X8
+          : SurfaceFormat::B8G8R8A8;
+
+  RefPtr<DataSourceSurface> dataSurface =
+      Factory::CreateDataSourceSurface(size, format);
+  if (NS_WARN_IF(!dataSurface)) {
+    return nullptr;
+  }
+
+  DataSourceSurface::MappedSurface mappedSurface;
+  if (!dataSurface->Map(DataSourceSurface::WRITE, &mappedSurface)) {
+    return nullptr;
+  }
+
+  if (ioFormat == SurfaceFormat::NV12) {
+    /* Extract and separate the CbCr planes */
+    size_t cbCrStride = aSurface->GetBytesPerRow(1);
+    size_t cbCrWidth = aSurface->GetDevicePixelWidth(1);
+    size_t cbCrHeight = aSurface->GetDevicePixelHeight(1);
+
+    auto cbPlane = MakeUnique<uint8_t[]>(cbCrWidth * cbCrHeight);
+    auto crPlane = MakeUnique<uint8_t[]>(cbCrWidth * cbCrHeight);
+
+    uint8_t* src = (uint8_t*)aSurface->GetBaseAddressOfPlane(1);
+    uint8_t* cbDest = cbPlane.get();
+    uint8_t* crDest = crPlane.get();
+
+    for (size_t i = 0; i < cbCrHeight; i++) {
+      uint8_t* rowSrc = src + cbCrStride * i;
+      for (size_t j = 0; j < cbCrWidth; j++) {
+        *cbDest = *rowSrc;
+        cbDest++;
+        rowSrc++;
+        *crDest = *rowSrc;
+        crDest++;
+        rowSrc++;
+      }
+    }
+
+    /* Convert to RGB */
+    PlanarYCbCrData data;
+    data.mYChannel = (uint8_t*)aSurface->GetBaseAddressOfPlane(0);
+    data.mYStride = aSurface->GetBytesPerRow(0);
+    data.mCbChannel = cbPlane.get();
+    data.mCrChannel = crPlane.get();
+    data.mCbCrStride = cbCrWidth;
+    data.mPictureRect = IntRect(IntPoint(0, 0), size);
+    data.mYUVColorSpace = aSurface->GetYUVColorSpace();
+    data.mColorPrimaries = aSurface->mColorPrimaries;
+    data.mColorRange = aSurface->IsFullRange() ? gfx::ColorRange::FULL
+                                               : gfx::ColorRange::LIMITED;
+    data.mChromaSubsampling = ChromaSubsampling::HALF_WIDTH_AND_HEIGHT;
+
+    ConvertYCbCrToRGB(data, SurfaceFormat::B8G8R8X8, size, mappedSurface.mData,
+                      mappedSurface.mStride);
+  } else if (ioFormat == SurfaceFormat::YUV422) {
+    if (ioWidth == ALIGNED_32(ioWidth)) {
+      // Optimization when width is aligned to 32.
+      libyuv::ConvertToARGB((uint8_t*)aSurface->GetBaseAddress(),
+                            0 /* not used */, mappedSurface.mData,
+                            mappedSurface.mStride, 0, 0, size.width,
+                            size.height, size.width, size.height,
+                            libyuv::kRotate0, libyuv::FOURCC_YUYV);
+    } else {
+      /* Convert to YV16 */
+      size_t cbCrWidth = (ioWidth + 1) >> 1;
+      size_t cbCrHeight = ioHeight;
+      // Ensure our stride is a multiple of 32 to allow for memory aligned rows.
+      size_t cbCrStride = ALIGNED_32(cbCrWidth);
+      size_t strideDelta = cbCrStride - cbCrWidth;
+      MOZ_ASSERT(strideDelta <= 31);
+
+      auto yPlane = MakeUnique<uint8_t[]>(cbCrStride * 2 * ioHeight + 31);
+      auto cbPlane = MakeUnique<uint8_t[]>(cbCrStride * cbCrHeight + 31);
+      auto crPlane = MakeUnique<uint8_t[]>(cbCrStride * cbCrHeight + 31);
+
+      uint8_t* src = (uint8_t*)aSurface->GetBaseAddress();
+      uint8_t* yDest = ALIGNEDPTR_32(yPlane.get());
+      uint8_t* cbDest = ALIGNEDPTR_32(cbPlane.get());
+      uint8_t* crDest = ALIGNEDPTR_32(crPlane.get());
+
+      for (size_t i = 0; i < ioHeight; i++) {
+        uint8_t* rowSrc = src + bytesPerRow * i;
+        for (size_t j = 0; j < cbCrWidth; j++) {
+          *yDest = *rowSrc;
+          yDest++;
+          rowSrc++;
+          *cbDest = *rowSrc;
+          cbDest++;
+          rowSrc++;
+          *yDest = *rowSrc;
+          yDest++;
+          rowSrc++;
+          *crDest = *rowSrc;
+          crDest++;
+          rowSrc++;
+        }
+        if (strideDelta) {
+          cbDest += strideDelta;
+          crDest += strideDelta;
+          yDest += strideDelta << 1;
+        }
+      }
+
+      /* Convert to RGB */
+      PlanarYCbCrData data;
+      data.mYChannel = ALIGNEDPTR_32(yPlane.get());
+      data.mYStride = cbCrStride * 2;
+      data.mCbChannel = ALIGNEDPTR_32(cbPlane.get());
+      data.mCrChannel = ALIGNEDPTR_32(crPlane.get());
+      data.mCbCrStride = cbCrStride;
+      data.mPictureRect = IntRect(IntPoint(0, 0), size);
+      data.mYUVColorSpace = aSurface->GetYUVColorSpace();
+      data.mColorPrimaries = aSurface->mColorPrimaries;
+      data.mColorRange = aSurface->IsFullRange() ? gfx::ColorRange::FULL
+                                                 : gfx::ColorRange::LIMITED;
+      data.mChromaSubsampling = ChromaSubsampling::HALF_WIDTH;
+
+      ConvertYCbCrToRGB(data, SurfaceFormat::B8G8R8X8, size,
+                        mappedSurface.mData, mappedSurface.mStride);
+    }
+  } else {
+    unsigned char* ioData = (unsigned char*)aSurface->GetBaseAddress();
+
+    for (size_t i = 0; i < ioHeight; ++i) {
+      memcpy(mappedSurface.mData + i * mappedSurface.mStride,
+             ioData + i * bytesPerRow, ioWidth * 4);
+    }
+  }
+
+  dataSurface->Unmap();
+
+  return dataSurface.forget();
+}
+
+already_AddRefed<SourceSurface> CreateSourceSurfaceFromMacIOSurface(
+    MacIOSurface* aSurface) {
+  aSurface->Lock();
+  RefPtr<SourceSurface> result =
+      CreateSourceSurfaceFromLockedMacIOSurface(aSurface);
+  aSurface->Unlock();
+  return result.forget();
+}
+
+}  // namespace layers
+}  // namespace mozilla