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->buf == NULL) {
  44                         i->buf = new unsigned char[width * height * 4];
  45                         i->screen->draw(i->buf, width, height);
  46                 }
  47         }
  48         // end of "line 1"-code :-)
  49
  50         bool force = false;
  51
  52         if (subscreens.size() == 0) {
  53                 valid = true;
  54                 gettimeofday(&last_update, NULL);
  55                 return;
  56         }
  57
  58         // if we're in a fade, complete it before doing anything else
  59         if (in_fade) {
  60                 struct timeval now;
  61                 gettimeofday(&now, NULL);
  62
  63                 if (!fade_found_start_time) {
  64                         fade_found_start_time = true;
  65                         fade_started = now;
  66                 }
  67
  68                 double elapsed_fade = double(now.tv_sec - fade_started.tv_sec) +
  69                         double(now.tv_usec - fade_started.tv_usec) * 1.0e-6;
  70
  71                 if (elapsed_fade > 5.5 || (!fade_to_new_info && elapsed_fade > 0.5)) {
  72                         in_fade = false;
  73
  74                         // ugly hack here? :-)
  75                         subscreens[current_screen].screen->draw(subscreens[current_screen].buf, width, height);
  76
  77                         memcpy(buf, subscreens[current_screen].buf, width * height * 4);
  78                 } else {
  79                         // find the fade factors
  80                         int fr, fg, fb, fa;
  81                         if (fade_to_new_info) {
  82                                 if (elapsed_fade < 0.5) {
  83                                         fr = fg = fb = fa = unsigned(elapsed_fade/0.5 * 256.0);
  84                                 } else {
  85                                         fr = fg = fb = fa = unsigned((elapsed_fade-0.5)/5.0 * 256.0);
  86                                 }
  87                         } else {
  88                                 fr = fg = fb = fa = unsigned(elapsed_fade/0.5 * 256.0);
  89                         }
  90
  91                         unsigned char *sptr1 = fadefrom_buf;
  92                         unsigned char *sptr2 = subscreens[current_screen].buf;
  93                         unsigned char *dptr = buf;
  94
  95                         if (fade_to_new_info && elapsed_fade >= 0.5) {
  96                                 // fade G&B to be = R
  97                                 for (unsigned i = 0; i < width * height; ++i) {
  98                                         dptr[0] = sptr2[0] + (((int(sptr2[2]) - int(sptr2[0])) * fb) >> 8);
  99                                         dptr[1] = sptr2[1] + (((int(sptr2[2]) - int(sptr2[1])) * fg) >> 8);
 100                                         dptr[2] = sptr2[2];
 101                                         dptr[3] = sptr2[3];
 102
 103                                         sptr1 += 4, sptr2 += 4, dptr += 4;
 104                                 }
 105                         } else {
 106                                 for (unsigned i = 0; i < width * height; ++i) {
 107                                         dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * fb) >> 8);
 108                                         dptr[1] = sptr1[1] + (((int(sptr2[1]) - int(sptr1[1])) * fg) >> 8);
 109                                         dptr[2] = sptr1[2] + (((int(sptr2[2]) - int(sptr1[2])) * fr) >> 8);
 110                                         dptr[3] = sptr1[3] + (((int(sptr2[3]) - int(sptr1[3])) * fa) >> 8);
 111
 112                                         sptr1 += 4, sptr2 += 4, dptr += 4;
 113                                 }
 114                         }
 115                 }
 116         } else {
 117                 // determine if we want to switch screens
 118
 119                 unsigned old_current_screen = current_screen;
 120                 int priority = -9999;  // bah :-P
 121
 122                 // push any invalidated screen first (for now)
 123                 for (unsigned i = 0; i < subscreens.size(); ++i) {
 124                         if (subscreens[i].screen->check_invalidated() && subscreens[i].screen->get_priority() > priority) {
 125                                 current_screen = i;
 126                                 force = true;
 127                                 priority = subscreens[i].screen->get_priority();
 128                         }
 129                 }
 130
 131                 // check if we want to go to the next screen
 132                 if (valid && !force && needs_update()) {
 133                         current_screen = (current_screen + 1) % subscreens.size();
 134                         gettimeofday(&last_update, NULL);
 135                 }
 136
 137                 if (!valid || current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
 138                         // initialize a fade
 139                         in_fade = true;
 140                         fade_found_start_time = false;
 141                         fade_to_new_info = force;
 142
 143                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, width * height * 4);
 144
 145                         if (subscreens[current_screen].screen->check_invalidated()) {
 146                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf, width, height);
 147                         }
 148                 }
 149         }
 150
 151         if (!valid) {
 152                 valid = true;
 153                 gettimeofday(&last_update, NULL);
 154         }
 155 }
 156
 157 // note: makes no sense if valid=false!
 158 bool RotateScreen::needs_update()
 159 {
 160         struct timeval now;
 161         gettimeofday(&now, NULL);
 162
 163         double since = double(now.tv_sec - last_update.tv_sec) +
 164                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 165
 166         return (since >= 10.0);
 167 }
 168
 169 /*
 170  * Hold all screens for minimum three seconds, hold all screens with new info
 171  * for at minimum eight seconds. There's a slight hack here; a screen with new
 172  * info _might_ already be outdated (for instance, if we do an update to a group
 173  * with a mistake, then correct it quick afterwards). If it's already outdated,
 174  * we ignore the "eight second" rule; the results will be somewhat ugly, though,
 175  * but it's hard to do much better without too much special code.
 176  */
 177 bool RotateScreen::can_update()
 178 {
 179         struct timeval now;
 180         gettimeofday(&now, NULL);
 181
 182         double since = double(now.tv_sec - last_update.tv_sec) +
 183                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 184
 185         if (since < 3.0)
 186                 return false;
 187         if (fade_to_new_info && !subscreens[current_screen].screen->check_invalidated() && since < 8.0)
 188                 return false;
 189         return true;
 190 }
 191
 192 void RotateScreen::add_screen(GenericScreen *screen)
 193 {
 194         Subscreen ss;
 195         ss.buf = NULL;
 196         ss.screen = screen;
 197
 198         subscreens.push_back(ss);
 199 }
 200