1 /*
2  * Copyright (c) 2022 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #ifndef FRAMEBUFFER_ALLOCATOR_H
16 #define FRAMEBUFFER_ALLOCATOR_H
17 #include <queue>
18 #include <linux/fb.h>
19 #include "allocator.h"
20 namespace OHOS {
21 namespace HDI {
22 namespace DISPLAY {
23 class FramebufferAllocator : public Allocator {
24 public:
25     int32_t Init() override;
26     int32_t Allocate(const BufferInfo &bufferInfo, BufferHandle &handle) override;
27     void* Mmap(BufferHandle &handle) override;
28     int32_t Unmap(BufferHandle &handle) override;
29     int32_t FreeMem(BufferHandle *handle) override;
30     ~FramebufferAllocator() override;
31 private:
32     static constexpr uint32_t FB_BUFFERS_NUM = 3;
33     static constexpr const char *FBDEV_PATH = "/dev/graphics/fb0";
34 
35     int32_t SetFdFormatAndVirtualRes(struct fb_var_screeninfo varInfo);
36     int32_t InitFb();
37     int32_t GetDmaBuffer();
38 
39     struct fb_fix_screeninfo fixInfo_;
40     struct fb_var_screeninfo varInfo_;
41     // framebuffer information
42     uint32_t bufferSize_ = 0;
43     uint32_t buffersNum_ = 0;
44     uint32_t frameBufferSize_ = 0;
45     unsigned long smemStart_ = 0;
46     int32_t dmaBufferFb_ = -1;
47     int32_t deviceFd_ = -1;
48     std::queue<unsigned long> freeBuffers_;
49 };
50 }
51 }
52 }
53 #endif // FRAMEBUFFER_ALLOCATOR_H