[Ozone-DRI] Convert HardwareDisplayController to use scanout buffers

ui/ozone/platform/dri/hardware_display_controller.h

 // Copyright 2014 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 UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_CONTROLLER_H_
 #define UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_CONTROLLER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <xf86drmMode.h>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/ozone/platform/dri/dri_wrapper.h"
 
 namespace gfx {
 class Point;
 }
 
 namespace ui {
 
-class NativePixmap;
 class ScanoutBuffer;
-class ScanoutSurface;
 
-typedef std::vector<scoped_refptr<NativePixmap> > NativePixmapList;
+struct OverlayPlane {
+  // Simpler constructor for the primary plane.
+  explicit OverlayPlane(scoped_refptr<ScanoutBuffer> buffer);
 
-struct OzoneOverlayPlane {
-  OzoneOverlayPlane(ScanoutSurface* scanout,
-                    int z_order,
-                    gfx::OverlayTransform plane_transform,
-                    const gfx::Rect& display_bounds,
-                    const gfx::RectF& crop_rect);
+  OverlayPlane(scoped_refptr<ScanoutBuffer> buffer,
+               int z_order,
+               gfx::OverlayTransform plane_transform,
+               const gfx::Rect& display_bounds,
+               const gfx::RectF& crop_rect);
 
-  ScanoutSurface* scanout;
+  ~OverlayPlane();
+
+  scoped_refptr<ScanoutBuffer> buffer;
   int z_order;
   gfx::OverlayTransform plane_transform;
   gfx::Rect display_bounds;
   gfx::RectF crop_rect;
   int overlay_plane;
 };
 
+typedef std::vector<OverlayPlane> OverlayPlaneList;
+
 // The HDCOz will handle modesettings and scannout operations for hardware
 // devices.
 //
 // In the DRM world there are 3 components that need to be paired up to be able
 // to display an image to the monitor: CRTC (cathode ray tube controller),
 // encoder and connector. The CRTC determines which framebuffer to read, when
 // to scanout and where to scanout. Encoders converts the stream from the CRTC
 // to the appropriate format for the connector. The connector is the physical
 // connection that monitors connect to.
 //
@@ skipping 43 matching lines @@
 // connectors active if some use the same CRTC to mirror the display.
 class HardwareDisplayController
     : public base::SupportsWeakPtr<HardwareDisplayController> {
  public:
   HardwareDisplayController(DriWrapper* drm,
                             uint32_t connector_id,
                             uint32_t crtc_id);
 
   ~HardwareDisplayController();
 
-  // Associate the HDCO with a surface implementation and initialize it.
-  bool BindSurfaceToController(scoped_ptr<ScanoutSurface> surface,
-                               drmModeModeInfo mode);
-
-  void UnbindSurfaceFromController();
+  // Performs the initial CRTC configuration. If successful, it will display the
+  // framebuffer for |primary| with |mode|.
+  bool Modeset(const OverlayPlane& primary,
+               drmModeModeInfo mode);
 
   // Reconfigures the CRTC with the current surface and mode.
   bool Enable();
 
   // Disables the CRTC.
   void Disable();
 
-  // Schedules the |surface_|'s framebuffer to be displayed on the next vsync
+  // Schedules the |overlays|' framebuffers to be displayed on the next vsync
   // event. The event will be posted on the graphics card file descriptor |fd_|
   // and it can be read and processed by |drmHandleEvent|. That function can
   // define the callback for the page flip event. A generic data argument will
   // be presented to the callback. We use that argument to pass in the HDCO
   // object the event belongs to.
   //
-  // Between this call and the callback, the framebuffer used in this call
+  // Between this call and the callback, the framebuffers used in this call
   // should not be modified in any way as it would cause screen tearing if the
   // hardware performed the flip. Note that the frontbuffer should also not
   // be modified as it could still be displayed.
   //
   // Note that this function does not block. Also, this function should not be
   // called again before the page flip occurrs.
   //
   // Returns true if the page flip was successfully registered, false otherwise.
-  bool SchedulePageFlip(const std::vector<OzoneOverlayPlane>& overlays,
-                        NativePixmapList* references);
+  bool SchedulePageFlip(const OverlayPlaneList& overlays);
 
   // TODO(dnicoara) This should be on the MessageLoop when Ozone can have
   // BeginFrame can be triggered explicitly by Ozone.
   void WaitForPageFlipEvent();
 
   // Called when the page flip event occurred. The event is provided by the
   // kernel when a VBlank event finished. This allows the controller to
   // update internal state and propagate the update to the surface.
   // The tuple (seconds, useconds) represents the event timestamp. |seconds|
   // represents the number of seconds while |useconds| represents the
   // microseconds (< 1 second) in the timestamp.
   void OnPageFlipEvent(unsigned int frame,
                        unsigned int seconds,
                        unsigned int useconds);
 
   // Set the hardware cursor to show the contents of |surface|.
   bool SetCursor(scoped_refptr<ScanoutBuffer> buffer);
 
   bool UnsetCursor();
 
   // Moves the hardware cursor to |location|.
   bool MoveCursor(const gfx::Point& location);
 
   const drmModeModeInfo& get_mode() const { return mode_; };
   uint32_t connector_id() const { return connector_id_; }
   uint32_t crtc_id() const { return crtc_id_; }
-  ScanoutSurface* surface() const {
-    return surface_.get();
-  };
 
   uint64_t get_time_of_last_flip() const {
     return time_of_last_flip_;
   };
 
  private:
-  ScanoutSurface* GetPrimaryPlane(
-      const std::vector<OzoneOverlayPlane>& overlays);
-
-  NativePixmapList current_overlay_references_;
+  OverlayPlaneList current_planes_;
+  OverlayPlaneList pending_planes_;
 
   // Object containing the connection to the graphics device and wraps the API
   // calls to control it.
   DriWrapper* drm_;
 
   // TODO(dnicoara) Need to allow a CRTC to have multiple connectors.
   uint32_t connector_id_;
 
   uint32_t crtc_id_;
 
   drmModeModeInfo mode_;
 
-  scoped_ptr<ScanoutSurface> surface_;
-
   scoped_refptr<ScanoutBuffer> cursor_buffer_;
 
   uint64_t time_of_last_flip_;
 
   // Keeps track of the CRTC state. If a surface has been bound, then the value
   // is set to false. Otherwise it is true.
   bool is_disabled_;
 
   // Store the state of the CRTC before we took over. Used to restore the CRTC
   // once we no longer need it.
   ScopedDrmCrtcPtr saved_crtc_;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareDisplayController);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_HARDWARE_DISPLAY_CONTROLLER_H_