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