git.sesse.net Git - ccbs/blob - bigscreen/rotatescreen.cpp

   1 #include <cstring>
   2 #include "rotatescreen.h"
   3
   4 RotateScreen::RotateScreen()
   5         : valid(false), current_screen(0), in_fade(false)
   6 {
   7         fadefrom_buf = new unsigned char[800 * 600 * 4];
   8 }
   9
  10 RotateScreen::~RotateScreen()
  11 {
  12         delete fadefrom_buf;
  13 }
  14
  15 bool RotateScreen::check_invalidated()
  16 {
  17         if (!valid)
  18                 return true;
  19         if (in_fade)
  20                 return true;
  21         if (needs_update())
  22                 return true;
  23
  24         for (unsigned i = 0; i < subscreens.size(); ++i) {
  25                 if (subscreens[i].screen->check_invalidated())
  26                         return true;
  27         }
  28
  29         return false;
  30 }
  31
  32 void RotateScreen::draw(unsigned char *buf)
  33 {
  34         bool force = false;
  35
  36         // if we're in a fade, complete it before doing anything else
  37         if (in_fade) {
  38                 struct timeval now;
  39                 gettimeofday(&now, NULL);
  40
  41                 double elapsed_fade = double(now.tv_sec - fade_started.tv_sec) +
  42                         double(now.tv_usec - fade_started.tv_usec) * 1.0e-6;
  43                 printf("fade: %f\n", elapsed_fade);
  44
  45                 if (elapsed_fade > 0.5) {
  46                         in_fade = false;
  47                         memcpy(buf, subscreens[current_screen].buf, 800 * 600 * 4);
  48                         printf("fade done\n");
  49                 } else {
  50                         // find the fade factors
  51                         int fr = unsigned(elapsed_fade/0.5 * 256.0);
  52                         int fg = unsigned(elapsed_fade/0.5 * 256.0);
  53                         int fb = unsigned(elapsed_fade/0.5 * 256.0);
  54                         int fa = unsigned(elapsed_fade/0.5 * 256.0);
  55
  56                         unsigned char *sptr1 = fadefrom_buf;
  57                         unsigned char *sptr2 = subscreens[current_screen].buf;
  58                         unsigned char *dptr = buf;
  59
  60                         for (unsigned i = 0; i < 800 * 600; ++i) {
  61                                 dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * fr) >> 8);
  62                                 dptr[1] = sptr1[1] + (((int(sptr2[1]) - int(sptr1[1])) * fg) >> 8);
  63                                 dptr[2] = sptr1[2] + (((int(sptr2[2]) - int(sptr1[2])) * fb) >> 8);
  64                                 dptr[3] = sptr1[3] + (((int(sptr2[3]) - int(sptr1[3])) * fa) >> 8);
  65
  66                                 sptr1 += 4, sptr2 += 4, dptr += 4;
  67                         }
  68                 }
  69         } else {
  70                 // determine if we want to switch screens
  71
  72                 unsigned old_current_screen = current_screen;
  73
  74                 // push any invalidated screen first (for now)
  75                 for (unsigned i = 0; i < subscreens.size(); ++i) {
  76                         if (subscreens[i].screen->check_invalidated()) {
  77                                 current_screen = i;
  78                                 force = true;
  79                         }
  80                 }
  81
  82                 // check if we want to go to the next screen
  83                 if (valid && !force && needs_update()) {
  84                         current_screen = (current_screen + 1) % subscreens.size();
  85                         gettimeofday(&last_update, NULL);
  86                 }
  87
  88                 if (current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
  89                         // initialize a fade
  90                         in_fade = true;
  91                         gettimeofday(&fade_started, NULL);
  92                         printf("starting fade\n");
  93
  94                         if (subscreens[current_screen].screen->check_invalidated())
  95                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
  96
  97                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, 800 * 600 * 4);
  98                 }
  99         }
 100
 101         if (!valid) {
 102                 valid = true;
 103                 gettimeofday(&last_update, NULL);
 104         }
 105 }
 106
 107 // note: makes no sense if valid=false!
 108 bool RotateScreen::needs_update()
 109 {
 110         struct timeval now;
 111         gettimeofday(&now, NULL);
 112
 113         double since = double(now.tv_sec - last_update.tv_sec) +
 114                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 115
 116         return (since >= 10.0);
 117 }
 118
 119 void RotateScreen::add_screen(GenericScreen *screen)
 120 {
 121         Subscreen ss;
 122         ss.buf = new unsigned char[800 * 600 * 4];
 123         ss.screen = screen;
 124
 125         subscreens.push_back(ss);
 126 }
 127