35 lines
748 B
C++
35 lines
748 B
C++
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#include "Screen.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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Result<Screen> Screen::open()
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{
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int fd = ::open("/dev/fb0", O_RDWR | O_CLOEXEC);
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if (fd < 0) return err(errno);
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int width = ioctl(fd, FB_GET_WIDTH);
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int height = ioctl(fd, FB_GET_HEIGHT);
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void* p = mmap(nullptr, width * height * BYTES_PER_PIXEL, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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if (p == MAP_FAILED)
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{
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close(fd);
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return err(errno);
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}
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Screen screen;
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screen.m_canvas = ui::Canvas::create((u8*)p, width, height);
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screen.m_size = width * height * BYTES_PER_PIXEL;
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return screen;
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}
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void Screen::sync()
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{
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msync(m_canvas.ptr, size(), MS_SYNC);
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}
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