banan-os/userspace/WindowServer/Framebuffer.cpp

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#include "Framebuffer.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/framebuffer.h>
#include <sys/mman.h>
Framebuffer open_framebuffer()
{
int framebuffer_fd = open("/dev/fb0", O_RDWR);
if (framebuffer_fd == -1)
{
perror("open");
exit(1);
}
framebuffer_info_t framebuffer_info;
if (pread(framebuffer_fd, &framebuffer_info, sizeof(framebuffer_info), -1) == -1)
{
perror("pread");
exit(1);
}
const size_t framebuffer_bytes = framebuffer_info.width * framebuffer_info.height * (BANAN_FB_BPP / 8);
uint32_t* framebuffer_mmap = (uint32_t*)mmap(NULL, framebuffer_bytes, PROT_READ | PROT_WRITE, MAP_SHARED, framebuffer_fd, 0);
if (framebuffer_mmap == MAP_FAILED)
{
perror("mmap");
exit(1);
}
memset(framebuffer_mmap, 0, framebuffer_bytes);
msync(framebuffer_mmap, framebuffer_bytes, MS_SYNC);
Framebuffer framebuffer;
framebuffer.fd = framebuffer_fd;
framebuffer.mmap = framebuffer_mmap;
framebuffer.width = framebuffer_info.width;
framebuffer.height = framebuffer_info.height;
framebuffer.bpp = BANAN_FB_BPP;
return framebuffer;
}