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                 printf("fade: %f\n", elapsed_fade);
  44
  45                 if (elapsed_fade > 5.0 || (!same_fade && elapsed_fade > 0.5)) {
  46                         in_fade = false;
  47
  48                         // ugly hack here? :-)
  49                         subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
  50
  51                         memcpy(buf, subscreens[current_screen].buf, 800 * 600 * 4);
  52                         printf("fade done\n");
  53                 } else {
  54                         // find the fade factors
  55                         int fr, fg, fb, fa;
  56                         if (same_fade) {
  57                                 if (elapsed_fade < 0.5) {
  58                                         fr = fg = fb = fa = unsigned(elapsed_fade/0.5 * 256.0);
  59                                 } else {
  60                                         fr = fg = fb = fa = unsigned((elapsed_fade-0.5)/4.5 * 256.0);
  61                                 }
  62                         } else {
  63                                 fr = fg = fb = fa = unsigned(elapsed_fade/0.5 * 256.0);
  64                         }
  65                         printf("%u %u %u %u\n", fr, fg, fb, fa);
  66
  67                         unsigned char *sptr1 = fadefrom_buf;
  68                         unsigned char *sptr2 = subscreens[current_screen].buf;
  69                         unsigned char *dptr = buf;
  70
  71                         if (same_fade && elapsed_fade >= 0.5) {
  72                                 // fade G&B to be = R
  73                                 for (unsigned i = 0; i < 800 * 600; ++i) {
  74                                         dptr[0] = sptr2[0] + (((int(sptr2[2]) - int(sptr2[0])) * fb) >> 8);
  75                                         dptr[1] = sptr2[1] + (((int(sptr2[2]) - int(sptr2[1])) * fg) >> 8);
  76                                         dptr[2] = sptr2[2];
  77                                         dptr[3] = sptr2[3];
  78
  79                                         sptr1 += 4, sptr2 += 4, dptr += 4;
  80                                 }
  81                         } else {
  82                                 for (unsigned i = 0; i < 800 * 600; ++i) {
  83                                         dptr[0] = sptr1[0] + (((int(sptr2[0]) - int(sptr1[0])) * fb) >> 8);
  84                                         dptr[1] = sptr1[1] + (((int(sptr2[1]) - int(sptr1[1])) * fg) >> 8);
  85                                         dptr[2] = sptr1[2] + (((int(sptr2[2]) - int(sptr1[2])) * fr) >> 8);
  86                                         dptr[3] = sptr1[3] + (((int(sptr2[3]) - int(sptr1[3])) * fa) >> 8);
  87
  88                                         sptr1 += 4, sptr2 += 4, dptr += 4;
  89                                 }
  90                         }
  91                 }
  92         } else {
  93                 // determine if we want to switch screens
  94
  95                 unsigned old_current_screen = current_screen;
  96
  97                 // push any invalidated screen first (for now)
  98                 for (unsigned i = 0; i < subscreens.size(); ++i) {
  99                         if (subscreens[i].screen->check_invalidated()) {
 100                                 current_screen = i;
 101                                 force = true;
 102                         }
 103                 }
 104
 105                 // check if we want to go to the next screen
 106                 if (valid && !force && needs_update()) {
 107                         current_screen = (current_screen + 1) % subscreens.size();
 108                         gettimeofday(&last_update, NULL);
 109                 }
 110
 111                 if (current_screen != old_current_screen || subscreens[current_screen].screen->check_invalidated()) {
 112                         // initialize a fade
 113                         in_fade = true;
 114                         same_fade = (current_screen == old_current_screen);
 115                         gettimeofday(&fade_started, NULL);
 116                         printf("starting fade (same=%u)\n", same_fade);
 117
 118                         memcpy(fadefrom_buf, subscreens[old_current_screen].buf, 800 * 600 * 4);
 119
 120                         if (subscreens[current_screen].screen->check_invalidated())
 121                                 subscreens[current_screen].screen->draw(subscreens[current_screen].buf);
 122                 }
 123         }
 124
 125         if (!valid) {
 126                 valid = true;
 127                 gettimeofday(&last_update, NULL);
 128         }
 129 }
 130
 131 // note: makes no sense if valid=false!
 132 bool RotateScreen::needs_update()
 133 {
 134         struct timeval now;
 135         gettimeofday(&now, NULL);
 136
 137         double since = double(now.tv_sec - last_update.tv_sec) +
 138                 double(now.tv_usec - last_update.tv_usec) * 1.0e-6;
 139
 140         return (since >= 10.0);
 141 }
 142
 143 void RotateScreen::add_screen(GenericScreen *screen)
 144 {
 145         Subscreen ss;
 146         ss.buf = new unsigned char[800 * 600 * 4];
 147         ss.screen = screen;
 148
 149         subscreens.push_back(ss);
 150 }
 151