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 we're in a fade, complete it before doing anything else
  37         if (in_fade) {
  38                 struct timeval now;
  39                 gettimeofday(&now, NULL);
  40
  41                 if (!fade_found_start_time) {
  42                         fade_found_start_time = true;
  43                         fade_started = now;
  44                 }
  45
  46                 double elapsed_fade = double(now.tv_sec - fade_started.tv_sec) +
  47                         double(now.tv_usec - fade_started.tv_usec) * 1.0e-6;
  48
  49                 if (elapsed_fade > 6.0 || (!same_fade && elapsed_fade > 1.0)) {
  50                         in_fade = false;
  51
  52                         // ugly hack here? :-)
  53                         subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
  54
  55                         memcpy(buf, subscreens[current_screen].buf, 800 * 600 * 4);
  56                 } else {
  57                         // find the fade factors
  58                         int fr, fg, fb, fa;
  59                         if (same_fade) {
  60                                 if (elapsed_fade < 1.0) {
  61                                         fr = fg = fb = fa = unsigned(elapsed_fade/1.0 * 256.0);
  62                                 } else {
  63                                         fr = fg = fb = fa = unsigned((elapsed_fade-1.0)/5.0 * 256.0);
  64                                 }
  65                         } else {
  66                                 fr = fg = fb = fa = unsigned(elapsed_fade/1.0 * 256.0);
  67                         }
  68
  69                         unsigned char *sptr1 = fadefrom_buf;
  70                         unsigned char *sptr2 = subscreens[current_screen].buf;
  71                         unsigned char *dptr = buf;
  72
  73                         if (same_fade && elapsed_fade >= 1.0) {
  74                                 // fade G&B to be = R
  75                                 for (unsigned i = 0; i < 800 * 600; ++i) {
  76                                         dptr[0] = sptr2[0] + (((int(sptr2[2]) - int(sptr2[0])) * fb) >> 8);
  77                                         dptr[1] = sptr2[1] + (((int(sptr2[2]) - int(sptr2[1])) * fg) >> 8);
  78                                         dptr[2] = sptr2[2];
  79                                         dptr[3] = sptr2[3];
  80
  81                                         sptr1 += 4, sptr2 += 4, dptr += 4;
  82                                 }
  83                         } else {
  84                                 for (unsigned i = 0; i < 800 * 600; ++i) {
  85                                         dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * fb) >> 8);
  86                                         dptr[1] = sptr1[1] + (((int(sptr2[1]) - int(sptr1[1])) * fg) >> 8);
  87                                         dptr[2] = sptr1[2] + (((int(sptr2[2]) - int(sptr1[2])) * fr) >> 8);
  88                                         dptr[3] = sptr1[3] + (((int(sptr2[3]) - int(sptr1[3])) * fa) >> 8);
  89
  90                                         sptr1 += 4, sptr2 += 4, dptr += 4;
  91                                 }
  92                         }
  93                 }
  94         } else {
  95                 // determine if we want to switch screens
  96
  97                 unsigned old_current_screen = current_screen;
  98
  99                 // push any invalidated screen first (for now)
 100                 for (unsigned i = 0; i < subscreens.size(); ++i) {
 101                         if (subscreens[i].screen->check_invalidated()) {
 102                                 current_screen = i;
 103                                 force = true;
 104                         }
 105                 }
 106
 107                 // check if we want to go to the next screen
 108                 if (valid && !force && needs_update()) {
 109                         current_screen = (current_screen + 1) % subscreens.size();
 110                         gettimeofday(&last_update, NULL);
 111                 }
 112
 113                 if (current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
 114                         // initialize a fade
 115                         in_fade = true;
 116                         fade_found_start_time = false;
 117                         same_fade = (current_screen == old_current_screen);
 118
 119                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, 800 * 600 * 4);
 120
 121                         if (subscreens[current_screen].screen->check_invalidated())
 122                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
 123                 }
 124         }
 125
 126         if (!valid) {
 127                 valid = true;
 128                 gettimeofday(&last_update, NULL);
 129         }
 130 }
 131
 132 // note: makes no sense if valid=false!
 133 bool RotateScreen::needs_update()
 134 {
 135         struct timeval now;
 136         gettimeofday(&now, NULL);
 137
 138         double since = double(now.tv_sec - last_update.tv_sec) +
 139                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 140
 141         return (since >= 10.0);
 142 }
 143
 144 void RotateScreen::add_screen(GenericScreen *screen)
 145 {
 146         Subscreen ss;
 147         ss.buf = new unsigned char[800 * 600 * 4];
 148         ss.screen = screen;
 149
 150         subscreens.push_back(ss);
 151 }
 152