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)
   6 {
   7 }
   8
   9 RotateScreen::~RotateScreen()
  10 {
  11 }
  12
  13 bool RotateScreen::check_invalidated()
  14 {
  15         if (!valid)
  16                 return true;
  17
  18         if (needs_update())
  19                 return true;
  20
  21         for (unsigned i = 0; i < subscreens.size(); ++i) {
  22                 if (subscreens[i].screen->check_invalidated())
  23                         return true;
  24         }
  25
  26         return false;
  27 }
  28
  29 void RotateScreen::draw(unsigned char *buf)
  30 {
  31         bool force = false;
  32
  33         // push any invalidated screen first (for now)
  34         for (unsigned i = 0; i < subscreens.size(); ++i) {
  35                 if (subscreens[i].screen->check_invalidated()) {
  36                         current_screen = i;
  37                         force = true;
  38                 }
  39         }
  40
  41         // check if we want to go to the next screen
  42         if (valid && !force && needs_update()) {
  43                 current_screen = (current_screen + 1) % subscreens.size();
  44                 gettimeofday(&last_update, NULL);
  45         }
  46
  47         if (subscreens[current_screen].screen->check_invalidated())
  48                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
  49
  50         memcpy(buf, subscreens[current_screen].buf, 800 * 600 * 4);
  51
  52         if (!valid) {
  53                 valid = true;
  54                 gettimeofday(&last_update, NULL);
  55         }
  56 }
  57
  58 // note: makes no sense if valid=false!
  59 bool RotateScreen::needs_update()
  60 {
  61         struct timeval now;
  62         gettimeofday(&now, NULL);
  63
  64         double since = double(now.tv_sec - last_update.tv_sec) +
  65                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
  66
  67         return (since >= 10.0);
  68 }
  69
  70 void RotateScreen::add_screen(GenericScreen *screen)
  71 {
  72         Subscreen ss;
  73         ss.buf = new unsigned char[800 * 600 * 4];
  74         ss.screen = screen;
  75
  76         subscreens.push_back(ss);
  77 }
  78