core/misc/blittest.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <sys/mman.h>
   4 #include <sys/types.h>
   5 #include <fcntl.h>
   6 #include <string.h>
   7
   8 #define xres 1280
   9 #define yres 800
  10 #define cnt 1000
  11
  12 int main(int argc, char **argv)
  13 {
  14         int fd = open("/dev/fb0", O_RDWR);
  15         char *fb;
  16         char buf[xres*4];
  17         int i, j;
  18
  19         fb = mmap(NULL, xres*yres*4, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  20
  21         for (i = 0; i < xres; i++) {
  22                 buf[i] = rand();
  23         }
  24
  25         printf("performing %d full-screen blits\n", cnt);
  26         for (j = 0; j < cnt; j++) {
  27                 for (i = 0; i < yres; i++) {
  28                         memcpy(fb + xres*4*i, buf, xres*4);
  29                 }
  30         }
  31
  32         munmap(fb, xres*yres*4);
  33         close(fd);
  34
  35         return 0;
  36 }