source: abuse/trunk/src/imlib/filter.cpp @ 481 Tweet

/*
 *  Abuse - dark 2D side-scrolling platform game
 *  Copyright (c) 1995 Crack dot Com
 *
 *  This software was released into the Public Domain. As with most public
 *  domain software, no warranty is made or implied by Crack dot Com or
 *  Jonathan Clark.
 */

#include "config.h"

#include "image.h"
#include "macs.h"
#include "filter.h"

extern unsigned char current_background;

filter::filter(palette *from, palette *to)   // creates a conversion filter from one palette to another
{
  nc=from->pal_size() > to->pal_size() ? from->pal_size() : to->pal_size();
  unsigned char *p=fdat=(unsigned char *)malloc(nc);
  unsigned char *r,*g,*b;
  r=g=b=(unsigned char *)from->addr();
  g++;
  b+=2;

  int dk=to->darkest(1);
  for (int i=0;i<nc;i++,p++,r+=3,g+=3,b+=3)
  {
    *p=to->find_closest(*r,*g,*b);

    // make sure non-blacks don't get remapped to the transparency
    if ((*r!=0 || *g!=0 || *b!=0) && (to->red(*p)==0 && to->green(*p)==0 && to->blue(*p)==0))
      *p=dk;
  }

}

void filter::clear()
{
  int i;
  for (i=0;i<nc;i++)
    fdat[i]=i;
}

void filter::max_threshold(int minv, char blank)
{
  int i;
  CONDITION(minv>=0 && minv<nc,"Bad minv");
  for (i=0;i<minv;i++)
    fdat[i]=blank;
}

void filter::min_threshold(int maxv, char blank)
{
  int i;
  CONDITION(maxv>=0 && maxv<nc,"bad maxv value in filter::max_thresh");
  for (i=nc-1;i>=maxv;i--)
    fdat[i]=(unsigned) blank;
}


void filter::set(int color_num, char change_to)
{
  CONDITION(color_num>=0 && color_num<nc,"Bad colors_num");
  fdat[color_num]=(unsigned) change_to;
}


filter::filter(int colors)
{
  CONDITION(colors>=0 && colors<=256,"bad colors value");
  nc=colors;
  make_block(nc);
  fdat=(unsigned char *)malloc(nc);
  clear();
}

void filter::apply(image *im)
{
  int x,y;
  unsigned char *c;
  CONDITION(im,"null image passed in filter::apply\n");
  im->lock();
  for (y=im->height()-1;y>=0;y--)
  {
    c=im->scan_line(y);
    for (x=im->width()-1;x>=0;x--)
    {
      CONDITION((unsigned) c[x]<nc,"not enough filter colors");
      c[x]=fdat[(unsigned) c[x]];
    }
  }
  im->unlock();
}


palette *compare_pal;

int color_compare(void *c1, void *c2)
{
  long v1,v2;
  unsigned char r1,g1,b1,r2,g2,b2;
  compare_pal->get(  *((unsigned char *)c1),r1,g1,b1);
  compare_pal->get(  *((unsigned char *)c2),r2,g2,b2);
  v1=(int)r1*(int)r1+(int)g1*(int)g1+(int)b1*(int)b1;
  v2=(int)r2*(int)r2+(int)g2*(int)g2+(int)b2*(int)b2;
  if (v1<v2) return -1;
  else if (v1>v2) return 1;
  else return 0;
}

color_filter::color_filter(palette *pal, int color_bits, void (*stat_fun)(int))
{
  color_bits=5;      // hard code 5 for now
  int r,g,b,rv,gv,bv,
      c=0,i,max=pal->pal_size(),
      lshift=8-color_bits;
  unsigned char *pp;

  long dist_sqr,best;
  int colors=1<<color_bits;
  color_table=(unsigned char *)malloc(colors*colors*colors);
  for (r=0;r<colors;r++)
  {
    if (stat_fun) stat_fun(r);
    rv=r<<lshift;
    for (g=0;g<colors;g++)
    {
      gv=g<<lshift;
      for (b=0;b<colors;b++)
      {
    bv=b<<lshift;
        best=0x7fffffff;
        for (i=0,pp=(unsigned char *)pal->addr();i<max;i++)
        {
          register long rd=*(pp++)-rv,
                        gd=*(pp++)-gv,
                        bd=*(pp++)-bv;
    
          dist_sqr=(long)rd*rd+(long)bd*bd+(long)gd*gd;
          if (dist_sqr<best)
          { best=dist_sqr;
            c=i;
          }
        }
        color_table[r*colors*colors+g*colors+b]=c;
      }
    }
  }
}

color_filter::color_filter(spec_entry *e, bFILE *fp)
{
  fp->seek(e->offset,0);
  fp->read_uint16();
  int colors=32;
  color_table=(unsigned char *)malloc(colors*colors*colors);
  fp->read(color_table,colors*colors*colors);
}

int color_filter::size()
{
  int colors=32;
  return 2+colors*colors*colors;
}

int color_filter::write(bFILE *fp)
{
  int colors=32;
  fp->write_uint16(colors);
  return fp->write(color_table,colors*colors*colors)==colors*colors*colors;
}


void filter::put_image(image *screen, image *im, short x, short y,
                       char transparent)
{
    short cx1, cy1, cx2, cy2, x1 = 0, y1 = 0,
          x2 = im->width() - 1, y2 = im->height() - 1;
    screen->get_clip(cx1,cy1,cx2,cy2);

    // see if the image gets clipped off the screen
    if(x > cx2 || y > cy2 || x + (x2 - x1) < cx1 || y + (y2 - y1) < cy1)
        return;

    if(x < cx1)
    {
        x1 += (cx1 - x);
        x = cx1;
    }
    if(y < cy1)
    {
        y1 += (cy1 - y);
         y = cy1;
    }

    if(x + x2 - x1 + 1 > cx2)
        x2 = cx2 - x + x1;

    if(y + y2 - y1 + 1 > cy2)
        y2 = cy2 - y + y1;

    if(x1 > x2 || y1 > y2)
        return;

    int xl = x2 - x1 + 1;
    int yl = y2 - y1 + 1;

    screen->add_dirty(x, y, x + xl - 1, y + yl - 1);

    screen->lock();
    im->lock();

    uint8_t *pg1 = screen->scan_line(y), *source, *dest;
    uint8_t *pg2 = im->scan_line(y1);
    int i;
    for(int j = 0; j < yl; j++)
    {
        for(i = 0, source = &pg2[x1], dest = &pg1[x];
            i < xl;
            i++, source++, dest++)    
        {
            if(!transparent || *source != current_background)
                *dest=fdat[*source];
        }
        pg1 = screen->next_line(y + j, pg1);
        pg2 = im->next_line(y1 + j, pg2);
    }

    im->unlock();
    screen->unlock();
}