Implement common Ozone interface for Chromecast.

chromecast/ozone/cast_egl_platform.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 CHROMECAST_OZONE_CAST_EGL_PLATFORM_H_
+#define CHROMECAST_OZONE_CAST_EGL_PLATFORM_H_
+
+#include "ui/ozone/public/surface_factory_ozone.h"
+
+namespace gfx {
+class Size;
+}
+
+namespace chromecast {
+namespace ozone {
+
+// Interface representing all the hardware-specific elements of an Ozone
+// implementation for Cast.  Supply an implementation of this interface
+// to OzonePlatformCast to create a complete Ozone implementation.
+class CastEglPlatform {
+ public:
+  typedef ui::SurfaceFactoryOzone::AddGLLibraryCallback AddGLLibraryCallback;
+  typedef ui::SurfaceFactoryOzone::SetGLGetProcAddressProcCallback
+      SetGLGetProcAddressProcCallback;
+
+  virtual ~CastEglPlatform() {}
+
+  // Default display size is used for initial display and also as a minimum
+  // resolution for applications.
+  virtual gfx::Size GetDefaultDisplaySize() const = 0;
+
+  // Returns an array of EGL properties, which can be used in any EGL function
+  // used to select a display configuration. Note that all properties should be
+  // immediately followed by the corresponding desired value and array should be
+  // terminated with EGL_NONE. Ownership of the array is not transferred to
+  // caller. desired_list contains list of desired EGL properties and values.
+  virtual const int32* GetEGLSurfaceProperties(const int32* desired_list) = 0;
+
+  // Initialize/ShutdownHardware are called at most once each over the object's
+  // lifetime.  Initialize will be called before creating display type or
+  // window.  If Initialize fails, return false (Shutdown will still be called).
+  virtual bool InitializeHardware() = 0;
+  virtual void ShutdownHardware() = 0;
+
+  // Called once after hardware successfully initialized.  Implementation needs
+  // to add the EGL and GLES2 libraries through add_gl_library and also supply
+  // a pointer to eglGetProcAddress (or equivalent function).
+  virtual bool LoadEGLGLES2Bindings(
+      AddGLLibraryCallback add_gl_library,
+      SetGLGetProcAddressProcCallback set_gl_get_proc_address) = 0;
+
+  // Create/destroy an EGLNativeDisplayType.  These may be called multiple times
+  // over the object's lifetime, for example to release the display when
+  // switching to an external application.  There will be at most one display
+  // type at a time.
+  virtual intptr_t CreateDisplayType(const gfx::Size& size) = 0;
+  virtual void DestroyDisplayType(intptr_t display_type) = 0;
+
+  // Create/destroy an EGLNativeWindow.  There will be at most one window at a
+  // time, created within a valid display type.
+  virtual intptr_t CreateWindow(intptr_t display_type,
+                                const gfx::Size& size) = 0;
+  virtual void DestroyWindow(intptr_t window) = 0;
+};
+
+}  // namespace ozone
+}  // namespace chromecast
+
+#endif  // CHROMECAST_OZONE_CAST_EGL_PLATFORM_H_