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), fade_to_new_info(false)
   9 {
  10 }
  11
  12 RotateScreen::~RotateScreen()
  13 {
  14         delete[] fadefrom_buf;
  15         for (unsigned i = 0; i < subscreens.size(); ++i) {
  16                 delete[] subscreens[i].redbuf;
  17                 delete[] subscreens[i].buf;
  18         }
  19 }
  20
  21 bool RotateScreen::check_invalidated()
  22 {
  23         if (!valid)
  24                 return true;
  25         if (in_fade)
  26                 return true;
  27         if (needs_update())
  28                 return true;
  29         if (!can_update())
  30                 return false;
  31
  32         for (unsigned i = 0; i < subscreens.size(); ++i) {
  33                 if (subscreens[i].buf == NULL || subscreens[i].screen->check_invalidated())
  34                         return true;
  35         }
  36
  37         return false;
  38 }
  39
  40 void RotateScreen::draw(unsigned char *buf, unsigned width, unsigned height)
  41 {
  42         // see line 1 for all of this
  43         if (fadefrom_buf == NULL) {
  44                 fadefrom_buf = new unsigned char[width * height * 4];
  45         }
  46         for (std::vector<Subscreen>::iterator i = subscreens.begin(); i != subscreens.end(); ++i) {
  47                 if (i->redbuf == NULL) {
  48                         i->redbuf = new unsigned char[width * height * 4];
  49                 }
  50                 if (i->buf == NULL) {
  51                         i->buf = new unsigned char[width * height * 4];
  52                         i->screen->draw(i->buf, width, height);
  53                 }
  54         }
  55         // end of "line 1"-code :-)
  56
  57         bool force = false;
  58
  59         if (subscreens.size() == 0) {
  60                 valid = true;
  61                 gettimeofday(&last_update, NULL);
  62                 return;
  63         }
  64
  65         // if we're in a fade, complete it before doing anything else
  66         if (in_fade) {
  67                 struct timeval now;
  68                 gettimeofday(&now, NULL);
  69
  70                 if (!fade_found_start_time) {
  71                         fade_found_start_time = true;
  72                         fade_started = now;
  73                 }
  74
  75                 double elapsed_fade = double(now.tv_sec - fade_started.tv_sec) +
  76                         double(now.tv_usec - fade_started.tv_usec) * 1.0e-6;
  77
  78                 if (elapsed_fade > 5.5 || (!fade_to_new_info && elapsed_fade > 0.5)) {
  79                         in_fade = false;
  80
  81                         memcpy(buf, subscreens[current_screen].buf, width * height * 4);
  82                 } else {
  83                         unsigned char *sptr1, *sptr2;
  84                         unsigned char *dptr = buf;
  85                         int f;
  86                         if (fade_to_new_info) {
  87                                 if (elapsed_fade < 0.5) {
  88                                         sptr1 = fadefrom_buf;
  89                                         sptr2 = subscreens[current_screen].redbuf;
  90                                         f = unsigned(elapsed_fade/0.5 * 256.0);
  91                                 } else {
  92                                         sptr1 = subscreens[current_screen].redbuf;
  93                                         sptr2 = subscreens[current_screen].buf;
  94                                         f = unsigned((elapsed_fade-0.5)/5.0 * 256.0);
  95                                 }
  96                         } else {
  97                                 sptr1 = fadefrom_buf;
  98                                 sptr2 = subscreens[current_screen].buf;
  99                                 f = unsigned(elapsed_fade/0.5 * 256.0);
 100                         }
 101
 102                         for (unsigned i = 0; i < width * height; ++i) {
 103                                 dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * f) >> 8);
 104                                 dptr[1] = sptr1[1] + (((int(sptr2[1]) - int(sptr1[1])) * f) >> 8);
 105                                 dptr[2] = sptr1[2] + (((int(sptr2[2]) - int(sptr1[2])) * f) >> 8);
 106
 107                                 sptr1 += 4, sptr2 += 4, dptr += 4;
 108                         }
 109                 }
 110         } else {
 111                 // determine if we want to switch screens
 112
 113                 unsigned old_current_screen = current_screen;
 114                 int priority = -9999;  // bah :-P
 115
 116                 // push any invalidated screen first (for now)
 117                 for (unsigned i = 0; i < subscreens.size(); ++i) {
 118                         if (subscreens[i].screen->check_invalidated() && subscreens[i].screen->get_priority() > priority) {
 119                                 current_screen = i;
 120                                 force = true;
 121                                 priority = subscreens[i].screen->get_priority();
 122                         }
 123                 }
 124
 125                 // check if we want to go to the next screen
 126                 if (valid && !force && needs_update()) {
 127                         current_screen = (current_screen + 1) % subscreens.size();
 128                         gettimeofday(&last_update, NULL);
 129                 }
 130
 131                 if (!valid || current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
 132                         // initialize a fade
 133                         in_fade = true;
 134                         fade_found_start_time = false;
 135                         fade_to_new_info = force;
 136
 137                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, width * height * 4);
 138
 139                         if (subscreens[current_screen].screen->check_invalidated()) {
 140                                 if (fade_to_new_info) {
 141                                         subscreens[current_screen].screen->draw(subscreens[current_screen].redbuf, width, height);
 142                                 }
 143                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf, width, height);
 144                         }
 145                 }
 146         }
 147
 148         if (!valid) {
 149                 valid = true;
 150                 gettimeofday(&last_update, NULL);
 151         }
 152 }
 153
 154 // note: makes no sense if valid=false!
 155 bool RotateScreen::needs_update()
 156 {
 157         struct timeval now;
 158         gettimeofday(&now, NULL);
 159
 160         double since = double(now.tv_sec - last_update.tv_sec) +
 161                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 162
 163         return (since >= 10.0);
 164 }
 165
 166 /*
 167  * Hold all screens for minimum three seconds, hold all screens with new info
 168  * for at minimum eight seconds. There's a slight hack here; a screen with new
 169  * info _might_ already be outdated (for instance, if we do an update to a group
 170  * with a mistake, then correct it quick afterwards). If it's already outdated,
 171  * we ignore the "eight second" rule; the results will be somewhat ugly, though,
 172  * but it's hard to do much better without too much special code.
 173  */
 174 bool RotateScreen::can_update()
 175 {
 176         struct timeval now;
 177         gettimeofday(&now, NULL);
 178
 179         double since = double(now.tv_sec - last_update.tv_sec) +
 180                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 181
 182         if (since < 3.0)
 183                 return false;
 184         if (fade_to_new_info && subscreens.size() > 0 && !subscreens[current_screen].screen->check_invalidated() && since < 8.0)
 185                 return false;
 186         return true;
 187 }
 188
 189 void RotateScreen::add_screen(GenericScreen *screen)
 190 {
 191         Subscreen ss;
 192         ss.redbuf = NULL;
 193         ss.buf = NULL;
 194         ss.screen = screen;
 195
 196         subscreens.push_back(ss);
 197 }
 198