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                         // set G&B to be = R
  75                         unsigned char *ptr = subscreens[current_screen].buf;
  76                         for (unsigned i = 0; i < width * height; ++i) {
  77                                 ptr[1] = ptr[2] = ptr[3] = ptr[0];
  78                                 ptr += 4;
  79                         }
  80
  81                         memcpy(buf, subscreens[current_screen].buf, width * height * 4);
  82                 } else {
  83                         // find the fade f
  84                         int f;
  85                         if (fade_to_new_info) {
  86                                 if (elapsed_fade < 0.5) {
  87                                         f = unsigned(elapsed_fade/0.5 * 256.0);
  88                                 } else {
  89                                         f = unsigned((elapsed_fade-0.5)/5.0 * 256.0);
  90                                 }
  91                         } else {
  92                                 f = unsigned(elapsed_fade/0.5 * 256.0);
  93                         }
  94
  95                         unsigned char *sptr1 = fadefrom_buf;
  96                         unsigned char *sptr2 = subscreens[current_screen].buf;
  97                         unsigned char *dptr = buf;
  98
  99                         if (fade_to_new_info && elapsed_fade >= 0.5) {
 100                                 // fade G&B to be = R
 101                                 for (unsigned i = 0; i < width * height; ++i) {
 102                                         dptr[0] = sptr2[0] + (((int(sptr2[2]) - int(sptr2[0])) * f) >> 8);
 103                                         dptr[1] = dptr[0];
 104                                         dptr[2] = sptr2[2];
 105                                         dptr[3] = sptr2[3];
 106
 107                                         sptr1 += 4, sptr2 += 4, dptr += 4;
 108                                 }
 109                         } else {
 110                                 for (unsigned i = 0; i < width * height; ++i) {
 111                                         dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * f) >> 8);
 112                                         dptr[1] = dptr[0];
 113                                         dptr[2] = dptr[0];
 114                                         dptr[3] = dptr[0];
 115
 116                                         sptr1 += 4, sptr2 += 4, dptr += 4;
 117                                 }
 118                         }
 119                 }
 120         } else {
 121                 // determine if we want to switch screens
 122
 123                 unsigned old_current_screen = current_screen;
 124                 int priority = -9999;  // bah :-P
 125
 126                 // push any invalidated screen first (for now)
 127                 for (unsigned i = 0; i < subscreens.size(); ++i) {
 128                         if (subscreens[i].screen->check_invalidated() && subscreens[i].screen->get_priority() > priority) {
 129                                 current_screen = i;
 130                                 force = true;
 131                                 priority = subscreens[i].screen->get_priority();
 132                         }
 133                 }
 134
 135                 // check if we want to go to the next screen
 136                 if (valid && !force && needs_update()) {
 137                         current_screen = (current_screen + 1) % subscreens.size();
 138                         gettimeofday(&last_update, NULL);
 139                 }
 140
 141                 if (!valid || current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
 142                         // initialize a fade
 143                         in_fade = true;
 144                         fade_found_start_time = false;
 145                         fade_to_new_info = force;
 146
 147                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, width * height * 4);
 148
 149                         if (subscreens[current_screen].screen->check_invalidated()) {
 150                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf, width, height);
 151                         }
 152                 }
 153         }
 154
 155         if (!valid) {
 156                 valid = true;
 157                 gettimeofday(&last_update, NULL);
 158         }
 159 }
 160
 161 // note: makes no sense if valid=false!
 162 bool RotateScreen::needs_update()
 163 {
 164         struct timeval now;
 165         gettimeofday(&now, NULL);
 166
 167         double since = double(now.tv_sec - last_update.tv_sec) +
 168                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 169
 170         return (since >= 10.0);
 171 }
 172
 173 /*
 174  * Hold all screens for minimum three seconds, hold all screens with new info
 175  * for at minimum eight seconds. There's a slight hack here; a screen with new
 176  * info _might_ already be outdated (for instance, if we do an update to a group
 177  * with a mistake, then correct it quick afterwards). If it's already outdated,
 178  * we ignore the "eight second" rule; the results will be somewhat ugly, though,
 179  * but it's hard to do much better without too much special code.
 180  */
 181 bool RotateScreen::can_update()
 182 {
 183         struct timeval now;
 184         gettimeofday(&now, NULL);
 185
 186         double since = double(now.tv_sec - last_update.tv_sec) +
 187                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 188
 189         if (since < 3.0)
 190                 return false;
 191         if (fade_to_new_info && subscreens.size() > 0 && !subscreens[current_screen].screen->check_invalidated() && since < 8.0)
 192                 return false;
 193         return true;
 194 }
 195
 196 void RotateScreen::add_screen(GenericScreen *screen)
 197 {
 198         Subscreen ss;
 199         ss.buf = NULL;
 200         ss.screen = screen;
 201
 202         subscreens.push_back(ss);
 203 }
 204