1 files changed, 71 insertions, 0 deletions
diff --git a/gfx/layers/client/CanvasClient.h b/gfx/layers/client/CanvasClient.h
new file mode 100644
index 0000000000..2136e6f652
--- /dev/null
+++ b/gfx/layers/client/CanvasClient.h
@@ -0,0 +1,71 @@
+/* -*- 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_CANVASCLIENT_H
+#define MOZILLA_GFX_CANVASCLIENT_H
+
+#include "mozilla/Assertions.h"                 // for MOZ_ASSERT, etc
+#include "mozilla/Attributes.h"                 // for override
+#include "mozilla/RefPtr.h"                     // for RefPtr, already_AddRefed
+#include "mozilla/layers/CompositableClient.h"  // for CompositableClient
+#include "mozilla/layers/CompositorTypes.h"     // for TextureInfo, etc
+#include "mozilla/layers/LayersSurfaces.h"      // for SurfaceDescriptor
+#include "mozilla/layers/TextureClient.h"       // for TextureClient, etc
+#include "mozilla/layers/PersistentBufferProvider.h"
+
+#include "mozilla/MaybeOneOf.h"
+
+#include "mozilla/mozalloc.h"  // for operator delete
+
+#include "mozilla/gfx/Point.h"  // for IntSize
+#include "mozilla/gfx/Types.h"  // for SurfaceFormat
+
+namespace mozilla {
+namespace layers {
+
+class CompositableForwarder;
+
+/**
+ * Compositable client for 2d and webgl canvas.
+ */
+class CanvasClient final : public CompositableClient {
+  int32_t mFrameID = 0;
+  RefPtr<TextureClient> mFrontBuffer;
+
+ public:
+  /**
+   * Creates, configures, and returns a new canvas client. If necessary, a
+   * message will be sent to the compositor to create a corresponding image
+   * host.
+   */
+  CanvasClient(CompositableForwarder* aFwd, const TextureFlags flags)
+      : CompositableClient(aFwd, flags) {}
+
+  virtual ~CanvasClient() = default;
+
+  void Clear() { mFrontBuffer = nullptr; }
+
+  bool AddTextureClient(TextureClient* aTexture) override {
+    ++mFrameID;
+    return CompositableClient::AddTextureClient(aTexture);
+  }
+
+  TextureInfo GetTextureInfo() const override {
+    return TextureInfo(CompositableType::IMAGE, mTextureFlags);
+  }
+
+  void OnDetach() override { Clear(); }
+
+  RefPtr<TextureClient> CreateTextureClientForCanvas(gfx::SurfaceFormat,
+                                                     gfx::IntSize,
+                                                     TextureFlags);
+  void UseTexture(TextureClient*);
+};
+
+}  // namespace layers
+}  // namespace mozilla
+
+#endif