git.mutantstargoat.com Git - fbgfx/blob - src/conscr.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include "screen.h"
   5 #include "demo.h"
   6
   7 static int init(void);
   8 static void destroy(void);
   9 static void start(long trans_time);
  10 static void stop(long trans_time);
  11 static void draw(void);
  12
  13 static struct screen scr = {
  14         "console",
  15         init,
  16         destroy,
  17         start,
  18         stop,
  19         draw
  20 };
  21
  22 static void *saved_fb;
  23 static int fbsize;
  24 static long trans_start, trans_dur;
  25
  26 struct screen *console_screen(void)
  27 {
  28         return &scr;
  29 }
  30
  31 static int init(void)
  32 {
  33         fbsize = fb_width * fb_height * fb_depth / 8;
  34
  35         if(!(saved_fb = malloc(fbsize))) {
  36                 perror("failed to allocate memory");
  37                 return -1;
  38         }
  39         memcpy(saved_fb, fb_pixels, fbsize);
  40         return 0;
  41 }
  42
  43 static void destroy(void)
  44 {
  45         memcpy(fb_pixels, saved_fb, fbsize);
  46         free(saved_fb);
  47 }
  48
  49 static void start(long trans_time)
  50 {
  51 }
  52
  53 static void stop(long trans_time)
  54 {
  55         trans_start = time_msec;
  56         trans_dur = trans_time;
  57 }
  58
  59 static void draw(void)
  60 {
  61         int i, pixsz = fb_depth / 8;
  62         long elapsed, offs, rem;
  63         unsigned char *dptr = fb_pixels;
  64         unsigned char *sptr = saved_fb;
  65
  66         if(!trans_start) {
  67                 return;
  68         }
  69         printf("console draw\n");
  70
  71         elapsed = time_msec - trans_start;
  72         offs = fb_width * elapsed / trans_dur;
  73         rem = fb_width - offs;
  74
  75         for(i=0; i<fb_height; i++) {
  76                 if(offs > 0) {
  77                         memset(dptr, 0, offs * pixsz);
  78                 }
  79                 if(rem > 0) {
  80                         memcpy(dptr + offs * pixsz, sptr, rem * pixsz);
  81                 }
  82
  83                 dptr += fb_width * pixsz;
  84                 sptr += fb_width * pixsz;
  85         }
  86 }