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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <linux/fb.h>
#include <stdint.h>
#include <memory>
#include <vector>
#include <android-base/unique_fd.h>
#include "graphics.h"
#include "minui/minui.h"
class GRSurfaceFbdev : public GRSurface {
public:
// Creates and returns a GRSurfaceFbdev instance, or nullptr on error.
static std::unique_ptr<GRSurfaceFbdev> Create(int width, int height, int row_bytes,
int pixel_bytes);
uint8_t* data() override {
return buffer_;
}
protected:
using GRSurface::GRSurface;
private:
friend class MinuiBackendFbdev;
// Points to the start of the buffer: either the mmap'd framebuffer or one allocated in-memory.
uint8_t* buffer_{ nullptr };
};
class MinuiBackendFbdev : public MinuiBackend {
public:
MinuiBackendFbdev() = default;
~MinuiBackendFbdev() override = default;
GRSurface* Init() override;
GRSurface* Flip() override;
void Blank(bool) override;
private:
void SetDisplayedFramebuffer(size_t n);
std::unique_ptr<GRSurfaceFbdev> gr_framebuffer[2];
// Points to the current surface (i.e. one of the two gr_framebuffer's).
GRSurfaceFbdev* gr_draw{ nullptr };
bool double_buffered;
std::vector<uint8_t> memory_buffer;
size_t displayed_buffer{ 0 };
fb_var_screeninfo vi;
android::base::unique_fd fb_fd;
};
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