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

   1 /* NOTE: this class will _NOT_ handle resolution changes cleanly. You have been warned. :-) */
   2
   3 #include <cstdio>
   4 #include <cstring>
   5 #include "rotatescreen.h"
   6
   7 RotateScreen::RotateScreen()
   8         : fadefrom_buf(NULL), valid(false), current_screen(0), in_fade(false)
   9 {
  10 }
  11
  12 RotateScreen::~RotateScreen()
  13 {
  14         delete[] fadefrom_buf;
  15 }
  16
  17 bool RotateScreen::check_invalidated()
  18 {
  19         if (!valid)
  20                 return true;
  21         if (in_fade)
  22                 return true;
  23         if (needs_update())
  24                 return true;
  25         if (!can_update())
  26                 return false;
  27
  28         for (unsigned i = 0; i < subscreens.size(); ++i) {
  29                 if (subscreens[i].buf == NULL || subscreens[i].screen->check_invalidated())
  30                         return true;
  31         }
  32
  33         return false;
  34 }
  35
  36 void RotateScreen::draw(unsigned char *buf, unsigned width, unsigned height)
  37 {
  38         // see line 1 for all of this
  39         if (fadefrom_buf == NULL) {
  40                 fadefrom_buf = new unsigned char[width * height * 4];
  41         }
  42         for (std::vector<Subscreen>::iterator i = subscreens.begin(); i != subscreens.end(); ++i) {
  43                 if (i->redbuf == NULL) {
  44                         i->redbuf = new unsigned char[width * height * 4];
  45                 }
  46                 if (i->buf == NULL) {
  47                         i->buf = new unsigned char[width * height * 4];
  48                         i->screen->draw(i->buf, width, height);
  49                 }
  50         }
  51         // end of "line 1"-code :-)
  52
  53         bool force = false;
  54
  55         if (subscreens.size() == 0) {
  56                 valid = true;
  57                 gettimeofday(&last_update, NULL);
  58                 return;
  59         }
  60
  61         // if we're in a fade, complete it before doing anything else
  62         if (in_fade) {
  63                 struct timeval now;
  64                 gettimeofday(&now, NULL);
  65
  66                 if (!fade_found_start_time) {
  67                         fade_found_start_time = true;
  68                         fade_started = now;
  69                 }
  70
  71                 double elapsed_fade = double(now.tv_sec - fade_started.tv_sec) +
  72                         double(now.tv_usec - fade_started.tv_usec) * 1.0e-6;
  73
  74                 if (elapsed_fade > 5.5 || (!fade_to_new_info && elapsed_fade > 0.5)) {
  75                         in_fade = false;
  76
  77                         memcpy(buf, subscreens[current_screen].buf, width * height * 4);
  78                 } else {
  79                         unsigned char *sptr1, *sptr2;
  80                         unsigned char *dptr = buf;
  81                         int f;
  82                         if (fade_to_new_info) {
  83                                 if (elapsed_fade < 0.5) {
  84                                         sptr1 = fadefrom_buf;
  85                                         sptr2 = subscreens[current_screen].redbuf;
  86                                         f = unsigned(elapsed_fade/0.5 * 256.0);
  87                                 } else {
  88                                         sptr1 = subscreens[current_screen].redbuf;
  89                                         sptr2 = subscreens[current_screen].buf;
  90                                         f = unsigned((elapsed_fade-0.5)/5.0 * 256.0);
  91                                 }
  92                         } else {
  93                                 sptr1 = fadefrom_buf;
  94                                 sptr2 = subscreens[current_screen].buf;
  95                                 f = unsigned(elapsed_fade/0.5 * 256.0);
  96                         }
  97
  98                         for (unsigned i = 0; i < width * height; ++i) {
  99                                 dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * f) >> 8);
 100                                 dptr[1] = sptr1[1] + (((int(sptr2[1]) - int(sptr1[1])) * f) >> 8);
 101                                 dptr[2] = sptr1[2] + (((int(sptr2[2]) - int(sptr1[2])) * f) >> 8);
 102
 103                                 sptr1 += 4, sptr2 += 4, dptr += 4;
 104                         }
 105                 }
 106         } else {
 107                 // determine if we want to switch screens
 108
 109                 unsigned old_current_screen = current_screen;
 110                 int priority = -9999;  // bah :-P
 111
 112                 // push any invalidated screen first (for now)
 113                 for (unsigned i = 0; i < subscreens.size(); ++i) {
 114                         if (subscreens[i].screen->check_invalidated() && subscreens[i].screen->get_priority() > priority) {
 115                                 current_screen = i;
 116                                 force = true;
 117                                 priority = subscreens[i].screen->get_priority();
 118                         }
 119                 }
 120
 121                 // check if we want to go to the next screen
 122                 if (valid && !force && needs_update()) {
 123                         current_screen = (current_screen + 1) % subscreens.size();
 124                         gettimeofday(&last_update, NULL);
 125                 }
 126
 127                 if (!valid || current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
 128                         // initialize a fade
 129                         in_fade = true;
 130                         fade_found_start_time = false;
 131                         fade_to_new_info = force;
 132
 133                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, width * height * 4);
 134
 135                         if (subscreens[current_screen].screen->check_invalidated()) {
 136                                 if (fade_to_new_info) {
 137                                         subscreens[current_screen].screen->draw(subscreens[current_screen].redbuf, width, height);
 138                                 }
 139                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf, width, height);
 140                         }
 141                 }
 142         }
 143
 144         if (!valid) {
 145                 valid = true;
 146                 gettimeofday(&last_update, NULL);
 147         }
 148 }
 149
 150 // note: makes no sense if valid=false!
 151 bool RotateScreen::needs_update()
 152 {
 153         struct timeval now;
 154         gettimeofday(&now, NULL);
 155
 156         double since = double(now.tv_sec - last_update.tv_sec) +
 157                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 158
 159         return (since >= 10.0);
 160 }
 161
 162 /*
 163  * Hold all screens for minimum three seconds, hold all screens with new info
 164  * for at minimum eight seconds. There's a slight hack here; a screen with new
 165  * info _might_ already be outdated (for instance, if we do an update to a group
 166  * with a mistake, then correct it quick afterwards). If it's already outdated,
 167  * we ignore the "eight second" rule; the results will be somewhat ugly, though,
 168  * but it's hard to do much better without too much special code.
 169  */
 170 bool RotateScreen::can_update()
 171 {
 172         struct timeval now;
 173         gettimeofday(&now, NULL);
 174
 175         double since = double(now.tv_sec - last_update.tv_sec) +
 176                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 177
 178         if (since < 3.0)
 179                 return false;
 180         if (fade_to_new_info && subscreens.size() > 0 && !subscreens[current_screen].screen->check_invalidated() && since < 8.0)
 181                 return false;
 182         return true;
 183 }
 184
 185 void RotateScreen::add_screen(GenericScreen *screen)
 186 {
 187         Subscreen ss;
 188         ss.redbuf = NULL;
 189         ss.buf = NULL;
 190         ss.screen = screen;
 191
 192         subscreens.push_back(ss);
 193 }
 194