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