1 files changed, 52 insertions, 0 deletions
diff --git a/gfx/layers/SourceSurfaceVolatileData.cpp b/gfx/layers/SourceSurfaceVolatileData.cpp
new file mode 100644
index 0000000000..e555b53deb
--- /dev/null
+++ b/gfx/layers/SourceSurfaceVolatileData.cpp
@@ -0,0 +1,52 @@
+/* -*- 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 "SourceSurfaceVolatileData.h"
+
+#include "gfxAlphaRecovery.h"
+#include "mozilla/Likely.h"
+#include "mozilla/Types.h"  // for decltype
+
+namespace mozilla {
+namespace gfx {
+
+bool SourceSurfaceVolatileData::Init(const IntSize& aSize, int32_t aStride,
+                                     SurfaceFormat aFormat) {
+  mSize = aSize;
+  mStride = aStride;
+  mFormat = aFormat;
+
+  size_t alignment = size_t(1) << gfxAlphaRecovery::GoodAlignmentLog2();
+  mVBuf = new VolatileBuffer();
+  if (MOZ_UNLIKELY(!mVBuf->Init(aStride * aSize.height, alignment))) {
+    mVBuf = nullptr;
+    return false;
+  }
+
+  return true;
+}
+
+void SourceSurfaceVolatileData::GuaranteePersistance() {
+  MOZ_ASSERT_UNREACHABLE("Should use SourceSurfaceRawData wrapper!");
+}
+
+void SourceSurfaceVolatileData::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
+                                                    SizeOfInfo& aInfo) const {
+  aInfo.AddType(SurfaceType::DATA);
+  if (mVBuf) {
+    aInfo.mHeapBytes = mVBuf->HeapSizeOfExcludingThis(aMallocSizeOf);
+    aInfo.mNonHeapBytes = mVBuf->NonHeapSizeOfExcludingThis();
+#ifdef ANDROID
+    if (!mVBuf->OnHeap()) {
+      // Volatile buffers keep a file handle open on Android.
+      aInfo.mExternalHandles = 1;
+    }
+#endif
+  }
+}
+
+}  // namespace gfx
+}  // namespace mozilla