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         if (!can_update())
  24                 return false;
  25
  26         for (unsigned i = 0; i < subscreens.size(); ++i) {
  27                 if (subscreens[i].screen->check_invalidated())
  28                         return true;
  29         }
  30
  31         return false;
  32 }
  33
  34 void RotateScreen::draw(unsigned char *buf)
  35 {
  36         bool force = false;
  37
  38         if (subscreens.size() == 0) {
  39                 valid = true;
  40                 gettimeofday(&last_update, NULL);
  41                 return;
  42         }
  43
  44         // if we're in a fade, complete it before doing anything else
  45         if (in_fade) {
  46                 struct timeval now;
  47                 gettimeofday(&now, NULL);
  48
  49                 if (!fade_found_start_time) {
  50                         fade_found_start_time = true;
  51                         fade_started = now;
  52                 }
  53
  54                 double elapsed_fade = double(now.tv_sec - fade_started.tv_sec) +
  55                         double(now.tv_usec - fade_started.tv_usec) * 1.0e-6;
  56
  57                 if (elapsed_fade > 5.5 || (!fade_to_new_info && elapsed_fade > 0.5)) {
  58                         in_fade = false;
  59
  60                         // ugly hack here? :-)
  61                         subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
  62
  63                         memcpy(buf, subscreens[current_screen].buf, 800 * 600 * 4);
  64                 } else {
  65                         // find the fade factors
  66                         int fr, fg, fb, fa;
  67                         if (fade_to_new_info) {
  68                                 if (elapsed_fade < 0.5) {
  69                                         fr = fg = fb = fa = unsigned(elapsed_fade/0.5 * 256.0);
  70                                 } else {
  71                                         fr = fg = fb = fa = unsigned((elapsed_fade-0.5)/5.0 * 256.0);
  72                                 }
  73                         } else {
  74                                 fr = fg = fb = fa = unsigned(elapsed_fade/0.5 * 256.0);
  75                         }
  76
  77                         unsigned char *sptr1 = fadefrom_buf;
  78                         unsigned char *sptr2 = subscreens[current_screen].buf;
  79                         unsigned char *dptr = buf;
  80
  81                         if (fade_to_new_info && elapsed_fade >= 0.5) {
  82                                 // fade G&B to be = R
  83                                 for (unsigned i = 0; i < 800 * 600; ++i) {
  84                                         dptr[0] = sptr2[0] + (((int(sptr2[2]) - int(sptr2[0])) * fb) >> 8);
  85                                         dptr[1] = sptr2[1] + (((int(sptr2[2]) - int(sptr2[1])) * fg) >> 8);
  86                                         dptr[2] = sptr2[2];
  87                                         dptr[3] = sptr2[3];
  88
  89                                         sptr1 += 4, sptr2 += 4, dptr += 4;
  90                                 }
  91                         } else {
  92                                 for (unsigned i = 0; i < 800 * 600; ++i) {
  93                                         dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * fb) >> 8);
  94                                         dptr[1] = sptr1[1] + (((int(sptr2[1]) - int(sptr1[1])) * fg) >> 8);
  95                                         dptr[2] = sptr1[2] + (((int(sptr2[2]) - int(sptr1[2])) * fr) >> 8);
  96                                         dptr[3] = sptr1[3] + (((int(sptr2[3]) - int(sptr1[3])) * fa) >> 8);
  97
  98                                         sptr1 += 4, sptr2 += 4, dptr += 4;
  99                                 }
 100                         }
 101                 }
 102         } else {
 103                 // determine if we want to switch screens
 104
 105                 unsigned old_current_screen = current_screen;
 106
 107                 // push any invalidated screen first (for now)
 108                 for (unsigned i = 0; i < subscreens.size(); ++i) {
 109                         if (subscreens[i].screen->check_invalidated()) {
 110                                 current_screen = i;
 111                                 force = true;
 112                         }
 113                 }
 114
 115                 // check if we want to go to the next screen
 116                 if (valid && !force && needs_update()) {
 117                         current_screen = (current_screen + 1) % subscreens.size();
 118                         gettimeofday(&last_update, NULL);
 119                 }
 120
 121                 if (!valid || current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
 122                         // initialize a fade
 123                         in_fade = true;
 124                         fade_found_start_time = false;
 125                         fade_to_new_info = force;
 126
 127                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, 800 * 600 * 4);
 128
 129                         if (subscreens[current_screen].screen->check_invalidated())
 130                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
 131                 }
 132         }
 133
 134         if (!valid) {
 135                 valid = true;
 136                 gettimeofday(&last_update, NULL);
 137         }
 138 }
 139
 140 // note: makes no sense if valid=false!
 141 bool RotateScreen::needs_update()
 142 {
 143         struct timeval now;
 144         gettimeofday(&now, NULL);
 145
 146         double since = double(now.tv_sec - last_update.tv_sec) +
 147                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 148
 149         return (since >= 10.0);
 150 }
 151
 152 // hold all screens for minimum three seconds, hold all screens with new info for at minimum eight seconds
 153 bool RotateScreen::can_update()
 154 {
 155         struct timeval now;
 156         gettimeofday(&now, NULL);
 157
 158         double since = double(now.tv_sec - last_update.tv_sec) +
 159                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 160
 161         if (since < 3.0)
 162                 return false;
 163         if (fade_to_new_info && since < 8.0)
 164                 return false;
 165         return true;
 166 }
 167
 168 void RotateScreen::add_screen(GenericScreen *screen)
 169 {
 170         Subscreen ss;
 171         ss.buf = new unsigned char[800 * 600 * 4];
 172         ss.screen = screen;
 173
 174         screen->draw(ss.buf);
 175
 176         subscreens.push_back(ss);
 177 }
 178