Bug 1578380 - [Wayland] Implement WaylandDMABUFTextureClientOGL, r=sotaro

WaylandDMABufSurface is used as a backend for WaylandDMABUFTextureClientOGL.
Pixel data of WaylandDMABufSurface are located at GPU memory and can be
shared by processes.

Differential Revision: https://phabricator.services.mozilla.com/D46836

--HG--
extra : moz-landing-system : lando

gfx/layers/opengl/WaylandDMABUFTextureClientOGL.cpp

@@ -0,0 +1,107 @@
+/* -*- 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 "WaylandDMABUFTextureClientOGL.h"
+#include "mozilla/widget/WaylandDMABufSurface.h"
+#include "gfxPlatform.h"
+
+namespace mozilla {
+namespace layers {
+
+using namespace gfx;
+
+WaylandDMABUFTextureData::WaylandDMABUFTextureData(
+    WaylandDMABufSurface* aSurface, BackendType aBackend)
+    : mSurface(aSurface), mBackend(aBackend) {
+  MOZ_ASSERT(mSurface);
+}
+
+WaylandDMABUFTextureData::~WaylandDMABUFTextureData() = default;
+
+/* static */ WaylandDMABUFTextureData* WaylandDMABUFTextureData::Create(
+    const IntSize& aSize, SurfaceFormat aFormat, BackendType aBackend) {
+  if (aFormat != SurfaceFormat::B8G8R8A8 &&
+      aFormat != SurfaceFormat::B8G8R8X8) {
+    // TODO
+    NS_WARNING("WaylandDMABUFTextureData::Create() - wrong surface format!");
+    return nullptr;
+  }
+
+  int flags = DMABUF_TEXTURE;
+  if (aFormat == SurfaceFormat::B8G8R8A8) {
+    flags |= DMABUF_ALPHA;
+  }
+  RefPtr<WaylandDMABufSurface> surf = WaylandDMABufSurface::CreateDMABufSurface(
+      aSize.width, aSize.height, flags);
+  return new WaylandDMABUFTextureData(surf, aBackend);
+}
+
+TextureData* WaylandDMABUFTextureData::CreateSimilar(
+    LayersIPCChannel* aAllocator, LayersBackend aLayersBackend,
+    TextureFlags aFlags, TextureAllocationFlags aAllocFlags) const {
+  return WaylandDMABUFTextureData::Create(
+      gfx::IntSize(mSurface->GetWidth(), mSurface->GetHeight()),
+      mSurface->GetFormat(), mBackend);
+}
+
+bool WaylandDMABUFTextureData::Serialize(SurfaceDescriptor& aOutDescriptor) {
+  mSurface->Serialize(aOutDescriptor);
+  return true;
+}
+
+void WaylandDMABUFTextureData::FillInfo(TextureData::Info& aInfo) const {
+  aInfo.size = gfx::IntSize(mSurface->GetWidth(), mSurface->GetHeight());
+  aInfo.format = mSurface->GetFormat();
+  aInfo.hasIntermediateBuffer = false;
+  aInfo.hasSynchronization = false;
+  aInfo.supportsMoz2D = true;
+  aInfo.canExposeMappedData = false;
+}
+
+bool WaylandDMABUFTextureData::Lock(OpenMode) {
+  MOZ_ASSERT(!mSurface->IsMapped(), "Already locked?");
+  mSurface->Map();
+  return true;
+}
+
+void WaylandDMABUFTextureData::Unlock() { mSurface->Unmap(); }
+
+already_AddRefed<DataSourceSurface> WaylandDMABUFTextureData::GetAsSurface() {
+  // TODO: Update for debug purposes.
+  return nullptr;
+}
+
+already_AddRefed<DrawTarget> WaylandDMABUFTextureData::BorrowDrawTarget() {
+  MOZ_ASSERT(mBackend != BackendType::NONE);
+  if (mBackend == BackendType::NONE) {
+    // shouldn't happen, but degrade gracefully
+    return nullptr;
+  }
+  return Factory::CreateDrawTargetForData(
+      mBackend, (unsigned char*)mSurface->GetMappedRegion(),
+      IntSize(mSurface->GetWidth(), mSurface->GetHeight()),
+      mSurface->GetMappedRegionStride(), mSurface->GetFormat(), true);
+}
+
+void WaylandDMABUFTextureData::Deallocate(LayersIPCChannel*) {
+  mSurface = nullptr;
+}
+
+void WaylandDMABUFTextureData::Forget(LayersIPCChannel*) { mSurface = nullptr; }
+
+bool WaylandDMABUFTextureData::UpdateFromSurface(gfx::SourceSurface* aSurface) {
+  RefPtr<DrawTarget> dt = BorrowDrawTarget();
+  if (!dt) {
+    return false;
+  }
+
+  dt->CopySurface(aSurface, IntRect(IntPoint(), aSurface->GetSize()),
+                  IntPoint());
+  return true;
+}
+
+}  // namespace layers
+}  // namespace mozilla

gfx/layers/opengl/WaylandDMABUFTextureClientOGL.h

@@ -0,0 +1,59 @@
+/* -*- 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/. */
+
+#ifndef MOZILLA_GFX_MACIOSURFACETEXTURECLIENTOGL_H
+#define MOZILLA_GFX_MACIOSURFACETEXTURECLIENTOGL_H
+
+#include "mozilla/layers/TextureClientOGL.h"
+
+class WaylandDMABufSurface;
+
+namespace mozilla {
+namespace layers {
+
+class WaylandDMABUFTextureData : public TextureData {
+ public:
+  static WaylandDMABUFTextureData* Create(const gfx::IntSize& aSize,
+                                          gfx::SurfaceFormat aFormat,
+                                          gfx::BackendType aBackend);
+  ~WaylandDMABUFTextureData();
+
+  virtual TextureData* CreateSimilar(
+      LayersIPCChannel* aAllocator, LayersBackend aLayersBackend,
+      TextureFlags aFlags = TextureFlags::DEFAULT,
+      TextureAllocationFlags aAllocFlags = ALLOC_DEFAULT) const override;
+
+  void FillInfo(TextureData::Info& aInfo) const override;
+
+  bool Lock(OpenMode) override;
+
+  void Unlock() override;
+
+  already_AddRefed<gfx::DrawTarget> BorrowDrawTarget() override;
+
+  bool Serialize(SurfaceDescriptor& aOutDescriptor) override;
+
+  void Deallocate(LayersIPCChannel*) override;
+
+  void Forget(LayersIPCChannel*) override;
+
+  bool UpdateFromSurface(gfx::SourceSurface* aSurface) override;
+
+  // For debugging purposes only.
+  already_AddRefed<gfx::DataSourceSurface> GetAsSurface();
+
+ protected:
+  WaylandDMABUFTextureData(WaylandDMABufSurface* aSurface,
+                           gfx::BackendType aBackend);
+
+  RefPtr<WaylandDMABufSurface> mSurface;
+  gfx::BackendType mBackend;
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif  // MOZILLA_GFX_MACIOSURFACETEXTURECLIENTOGL_H