git.sesse.net Git - ccbs/blob - bigscreen/splitscreen.cpp

   1 /* NOTE: this class will _NOT_ handle resolution changes cleanly. You have been warned. :-) */
   2
   3 #include <cstring>
   4 #include <cstdlib>
   5 #include "splitscreen.h"
   6 #include "theme.h"
   7
   8 SplitScreen::SplitScreen(GenericScreen *s1, GenericScreen *s2, GenericScreen *s3, GenericScreen *s4)
   9         : valid(false)
  10 {
  11         subscreens[0] = s1;
  12         subscreens[1] = s2;
  13         subscreens[2] = s3;
  14         subscreens[3] = s4;
  15
  16         for (unsigned i = 0; i < 4; ++i)
  17                 subbufs[i] = NULL;
  18 }
  19
  20 SplitScreen::~SplitScreen()
  21 {
  22 }
  23
  24 bool SplitScreen::check_invalidated()
  25 {
  26         if (!valid)
  27                 return true;
  28
  29         for (unsigned i = 0; i < 4; ++i) {
  30                 if (subscreens[i] && subscreens[i]->check_invalidated())
  31                         return true;
  32         }
  33
  34         return false;
  35 }
  36
  37 void SplitScreen::draw(unsigned char *buf, unsigned width, unsigned height)
  38 {
  39         for (unsigned i = 0; i < 4; ++i) {
  40                 if (subbufs[i] == NULL) {  // see line 1
  41                         subbufs[i] = new unsigned char[width/2 * height/2 * 4];
  42                         memset(subbufs[i], 0, width/2 * height/2 * 4);
  43                 }
  44                 if (subscreens[i] && subscreens[i]->check_invalidated()) {
  45                         subscreens[i]->draw(subbufs[i], width/2, height/2);
  46                 }
  47         }
  48
  49         copy_subscreen(buf, subbufs[0], width, height);
  50         copy_subscreen(buf + (width/2) * 4, subbufs[1], width, height);
  51         copy_subscreen(buf + width * (height/2) * 4, subbufs[2], width, height);
  52         copy_subscreen(buf + width * (height/2) * 4 + (width/2) * 4, subbufs[3], width, height);
  53
  54         // make divider lines
  55         int r = atoi(get_theme_config("divider", "red").c_str());
  56         int g = atoi(get_theme_config("divider", "green").c_str());
  57         int b = atoi(get_theme_config("divider", "blue").c_str());
  58
  59         unsigned char *ptr = buf + (height/2) * width * 4;
  60         for (unsigned x = 0; x < width; ++x) {
  61                 *ptr++ = b;
  62                 *ptr++ = g;
  63                 *ptr++ = r;
  64                 *ptr++ = 0;
  65         }
  66
  67         ptr = buf + (width/2) * 4;
  68         for (unsigned y = 0; y < height; ++y) {
  69                 ptr[0] = b;
  70                 ptr[1] = g;
  71                 ptr[2] = r;
  72                 ptr[3] = 0;
  73
  74                 ptr += width * 4;
  75         }
  76
  77         valid = true;
  78 }
  79
  80 void SplitScreen::copy_subscreen(unsigned char *dst, unsigned char *src, unsigned width, unsigned height)
  81 {
  82         for (unsigned y = 0; y < height/2; ++y) {
  83                 unsigned char *sptr = src + y * width/2 * 4;
  84                 unsigned char *dptr = dst + y * width * 4;
  85
  86                 memcpy(dptr, sptr, width/2 * 4);
  87         }
  88 }
  89