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1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef _GRAPHICS_H_
18 #define _GRAPHICS_H_
19 
20 #include "minui/minui.h"
21 
22 class MinuiBackend {
23  public:
24   // Initializes the backend and returns a GRSurface* to draw into.
25   virtual GRSurface* Init() = 0;
26 
27   // Causes the current drawing surface (returned by the most recent call to Flip() or Init()) to
28   // be displayed, and returns a new drawing surface.
29   virtual GRSurface* Flip() = 0;
30 
31   // Blank (or unblank) the screen.
32   virtual void Blank(bool) = 0;
33 
34   // Device cleanup when drawing is done.
~MinuiBackend()35   virtual ~MinuiBackend() {};
36 };
37 
38 #endif  // _GRAPHICS_H_
39