Mac Overlays: Wire up overlays on Mac

content/common/gpu/image_transport_surface_overlay_mac.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_
+#define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_
+
+#import "base/mac/scoped_nsobject.h"
+#include "content/common/gpu/gpu_command_buffer_stub.h"
+#include "content/common/gpu/image_transport_surface.h"
+#include "ui/gl/gl_surface.h"
+
+@class CAContext;
+@class CALayer;
+
+namespace content {
+
+class ImageTransportSurfaceOverlayMac : public gfx::GLSurface,
+                                        public ImageTransportSurface {
+ public:
+  ImageTransportSurfaceOverlayMac(GpuChannelManager* manager,
+                                  GpuCommandBufferStub* stub,
+                                  gfx::PluginWindowHandle handle);
+
+  // GLSurface implementation
+  bool Initialize() override;
+  void Destroy() override;
+  bool IsOffscreen() override;
+  gfx::SwapResult SwapBuffers() override;
+  gfx::SwapResult PostSubBuffer(int x, int y, int width, int height) override;
+  bool SupportsPostSubBuffer() override;
+  gfx::Size GetSize() override;
+  void* GetHandle() override;
+
+  bool ScheduleOverlayPlane(int z_order,
+                            gfx::OverlayTransform transform,
+                            gfx::GLImage* image,
+                            const gfx::Rect& bounds_rect,
+                            const gfx::RectF& crop_rect) override;
+  bool IsSurfaceless() const override;
+
+  // ImageTransportSurface implementation
+  void OnBufferPresented(
+      const AcceleratedSurfaceMsg_BufferPresented_Params& params) override;
+  void OnResize(gfx::Size pixel_size, float scale_factor) override;
+  void SetLatencyInfo(const std::vector<ui::LatencyInfo>&) override;
+  void WakeUpGpu() override;
+
+ private:
+  ~ImageTransportSurfaceOverlayMac() override;
+  scoped_ptr<ImageTransportHelper> helper_;
+  base::scoped_nsobject<CAContext> ca_context_;
+  base::scoped_nsobject<CALayer> layer_;
+
+  // A phony NSView handle used to identify this.
+  gfx::AcceleratedWidget widget_;
+
+  gfx::Size pixel_size_;
+  float scale_factor_;
+  std::vector<ui::LatencyInfo> latency_info_;
+
+  // Weak pointer to the image provided when ScheduleOverlayPlane is called. Is
+  // consumed and reset when SwapBuffers is called. For now, only one overlay
+  // plane is supported.
+  gfx::GLImage* pending_overlay_image_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_OVERLAY_MAC_H_