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