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annotate fbt.c @ 10:078dc69945ad

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working: libjpeg-turbo support, handle fb and monitor with different size
author Peter Meerwald <pmeerw@pmeerw.net>
date Sun, 15 May 2011 17:48:57 +0200
parents c7af696b6221
children
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1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include <fcntl.h>
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4 #include <unistd.h>
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5 #include <sys/ioctl.h>
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6 #include <sys/mman.h>
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7
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8 #include "linux/fb.h"
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10 #include "common.h"
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11
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12 int main(int argc, char *argv[]) {
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14 if (argc != 2) {
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15 fprintf(stderr, "usage: fbt /dev/fbX\n");
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16 exit(EXIT_FAILURE);
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17 }
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18
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19 int fd = open(argv[1], O_RDWR);
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20 if (fd < 0) {
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21 perror("");
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22 exit(EXIT_FAILURE);
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23 }
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25 struct fb_fix_screeninfo sif;
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26 if (ioctl(fd, FBIOGET_FSCREENINFO, &sif) < 0) {
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27 perror("");
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28 exit(EXIT_FAILURE);
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29 }
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31 printf("id %s\n", sif.id);
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32 printf("type %d, aux %d\n", sif.type, sif.type_aux);
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33 printf("visual %d\n", sif.visual);
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34 printf("accel %d\n", sif.accel);
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35 printf("line length %d\n", sif.line_length);
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36 printf("mem %d\n", sif.smem_len);
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38 struct fb_var_screeninfo siv;
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39 if (ioctl(fd, FBIOGET_VSCREENINFO, &siv) < 0) {
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40 perror("");
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41 exit(EXIT_FAILURE);
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42 }
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43
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44 printf("res x %d y %d\n", siv.xres, siv.yres);
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45 printf("bpp %d\n", siv.bits_per_pixel);
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47 size_t fb_mem_size = siv.xres * siv.yres * siv.bits_per_pixel / 8;
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48 void *fb_mem = mmap(NULL, fb_mem_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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49 if (fb_mem == MAP_FAILED) {
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50 perror("");
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51 exit(EXIT_FAILURE);
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52 }
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53
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54 printf("-------------\n");
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55 fflush(stdout);
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56
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57 jpg_buf_t jpg_buf = build_jpg_from_fb((unsigned char *)fb_mem, siv.xres, siv.yres, siv.bits_per_pixel);
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59 munmap(fb_mem, fb_mem_size);
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60 close(fd);
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61
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62 printf("jpg %ld\n", jpg_buf.size);
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63
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64 FILE *f = fopen("test.jpg", "wb");
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65 if (!f) {
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66 fprintf(stderr, "fopen failed\n");
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67 exit(EXIT_FAILURE);
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68 }
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70 fwrite(jpg_buf.ptr, 1, jpg_buf.size, f);
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72 fclose(f);
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73
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74 free(jpg_buf.ptr);
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75
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76 exit(EXIT_SUCCESS);
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77 }

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