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 "splitscreen.h"
   5
   6 SplitScreen::SplitScreen(GenericScreen *s1, GenericScreen *s2, GenericScreen *s3, GenericScreen *s4)
   7         : valid(false)
   8 {
   9         subscreens[0] = s1;
  10         subscreens[1] = s2;
  11         subscreens[2] = s3;
  12         subscreens[3] = s4;
  13
  14         for (unsigned i = 0; i < 4; ++i)
  15                 subbufs[i] = NULL;
  16 }
  17
  18 SplitScreen::~SplitScreen()
  19 {
  20 }
  21
  22 bool SplitScreen::check_invalidated()
  23 {
  24         if (!valid)
  25                 return true;
  26
  27         for (unsigned i = 0; i < 4; ++i) {
  28                 if (subscreens[i] && subscreens[i]->check_invalidated())
  29                         return true;
  30         }
  31
  32         return false;
  33 }
  34
  35 void SplitScreen::draw(unsigned char *buf, unsigned width, unsigned height)
  36 {
  37         for (unsigned i = 0; i < 4; ++i) {
  38                 if (subbufs[i] == NULL) {  // see line 1
  39                         subbufs[i] = new unsigned char[width/2 * height/2 * 4];
  40                         memset(subbufs[i], 0, width/2 * height/2 * 4);
  41                 }
  42                 if (subscreens[i] && subscreens[i]->check_invalidated()) {
  43                         subscreens[i]->draw(subbufs[i], width/2, height/2);
  44                 }
  45         }
  46
  47         copy_subscreen(buf, subbufs[0], width, height);
  48         copy_subscreen(buf + (width/2) * 4, subbufs[1], width, height);
  49         copy_subscreen(buf + width * (height/2) * 4, subbufs[2], width, height);
  50         copy_subscreen(buf + width * (height/2) * 4 + (width/2) * 4, subbufs[3], width, height);
  51
  52         // make divider lines
  53         unsigned char *ptr = buf + (height/2) * width * 4;
  54         for (unsigned x = 0; x < width; ++x) {
  55                 *ptr++ = 255;
  56                 *ptr++ = 255;
  57                 *ptr++ = 255;
  58                 *ptr++ = 0;
  59         }
  60
  61         ptr = buf + (width/2) * 4;
  62         for (unsigned y = 0; y < height; ++y) {
  63                 ptr[0] = 255;
  64                 ptr[1] = 255;
  65                 ptr[2] = 255;
  66                 ptr[3] = 0;
  67
  68                 ptr += width * 4;
  69         }
  70
  71         valid = true;
  72 }
  73
  74 void SplitScreen::copy_subscreen(unsigned char *dst, unsigned char *src, unsigned width, unsigned height)
  75 {
  76         for (unsigned y = 0; y < height/2; ++y) {
  77                 unsigned char *sptr = src + y * width/2 * 4;
  78                 unsigned char *dptr = dst + y * width * 4;
  79
  80                 memcpy(dptr, sptr, width/2 * 4);
  81         }
  82 }
  83