MeowOS Dev
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39 lines
1.5 KiB
C
39 lines
1.5 KiB
C
/* fbcopy — copy buffer0 -> buffer1 within /dev/fb0 (mmap both, memcpy).
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* Reproduces the player's "screen-off frame lives in buffer1" state so the
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* launcher's bug condition (yoffset=1 at menu open) can be tested without
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* pressing power (which would also pause the player). */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.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 <stdint.h>
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#define GETV 0x4600
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int main(void) {
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int fd = open("/dev/fb0", O_RDWR);
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if (fd < 0) { perror("open"); return 1; }
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unsigned char v[160]; memset(v,0,sizeof v);
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if (ioctl(fd, GETV, v) < 0) { perror("getvar"); return 1; }
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uint32_t yres = *(uint32_t*)(v+4);
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uint32_t yv = *(uint32_t*)(v+12);
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uint32_t bpp = *(uint32_t*)(v+24);
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if (yv <= yres) { printf("not double-buffered (yv=%u yres=%u)\n", yv, yres); return 2; }
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/* line_length via fix info */
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unsigned char f[68]; memset(f,0,sizeof f);
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if (ioctl(fd, 0x4602, f) < 0) { perror("getfix"); return 1; }
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uint32_t line = *(uint32_t*)(f+44);
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if (!line) line = yres * (bpp/8);
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size_t frame = (size_t)line * yres;
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unsigned char *p = mmap(NULL, frame*2, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
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if (p == MAP_FAILED) { perror("mmap"); return 1; }
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memcpy(p + frame, p, frame); /* buffer1 <- buffer0 */
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printf("copied %zu bytes buffer0 -> buffer1 (line=%u yres=%u frame=%zu)\n", frame, line, yres, frame);
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munmap(p, frame*2);
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close(fd);
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return 0;
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}
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