source: abuse/trunk/src/imlib/image24.cpp @ 129

Last change on this file since 129 was 129, checked in by Sam Hocevar, 14 years ago
  • Get rid of jmalloc and replace it with standard malloc. Modern operating systems certainly perform a lot better than this custom implementation, and we have superior tools (eg. valgrind) to debug and profile memory usage without interfering with the code itself.
File size: 2.3 KB
Line 
1/*
2 *  Abuse - dark 2D side-scrolling platform game
3 *  Copyright (c) 1995 Crack dot Com
4 *
5 *  This software was released into the Public Domain. As with most public
6 *  domain software, no warranty is made or implied by Crack dot Com or
7 *  Jonathan Clark.
8 */
9
10#include "config.h"
11
12#include "image24.hpp"
13#include "image.hpp"
14
15image24::image24(unsigned short width, unsigned short height,
16                 unsigned char *buffer)
17{
18  w=width;
19  h=height;
20
21  data=(unsigned char *)malloc(width*height*3);
22  CONDITION(data,"unable to alloc enough memory for 24 bit image");
23}
24
25void image24::clear(unsigned char r, unsigned char g,
26                    unsigned char b)
27{
28  int x,y;
29  unsigned char *p=data;
30  for (y=0;y<h;y++)
31  {
32    for (x=0;x<w;x++)
33    {
34      *(p++)=r;
35      *(p++)=g;
36      *(p++)=b;
37    }
38  }
39}
40
41
42void image24::add_error(int x, int y, int r_error, int g_error, int b_error, int error_mult)
43{
44  if (x>=w || x<0 || y>=h || y<0)           // check to make sure this pixel is in the image
45    return ;
46  unsigned char *pix=data+(y*w*3+x*3);
47  int result;
48
49  result=(int)(*pix)+r_error*error_mult/32;
50  if (result>255)
51    *pix=255;
52  else if (result<0) *pix=0;
53  else *pix=result;
54  pix++;
55
56  result=(int)(*pix)+g_error*error_mult/32;
57  if (result>255)
58    *pix=255;
59  else if (result<0) *pix=0;
60  else *pix=result;
61  pix++;
62
63  result=(int)(*pix)+b_error*error_mult/32;
64  if (result>255)
65    *pix=255;
66  else if (result<0) *pix=0;
67  else *pix=result;
68}
69
70
71image *image24::dither(palette *pal)
72{
73  int i,j,closest;
74  unsigned char r,g,b,*cur_pixel=data,ar,ag,ab;
75  image *dest=new image(w,h);
76  for (j=0;j<h;j++)
77  {
78    for (i=0;i<w;i++)
79    {
80      r=(*cur_pixel);  cur_pixel++;
81      g=(*cur_pixel);  cur_pixel++;
82      b=(*cur_pixel);  cur_pixel++;
83      closest=pal->find_closest(r,g,b);           // find the closest match in palette
84      dest->putpixel(i,j,closest);               // set the pixel to this color
85
86      pal->get(closest,ar,ag,ab);                   // see what the actual color we used was
87
88      add_error(i+1,j,ar-r,ag-g,ab-b,8);
89      add_error(i+2,j,ar-r,ag-g,ab-b,4);
90
91      add_error(i-2,j+1,ar-r,ag-g,ab-b,2);
92      add_error(i-1,j+1,ar-r,ag-g,ab-b,4);
93      add_error(i,j+1,ar-r,ag-g,ab-b,8);
94      add_error(i+1,j+1,ar-r,ag-g,ab-b,4);
95      add_error(i+2,j+1,ar-r,ag-g,ab-b,2);
96    }
97  }
98  return dest;
99}
100
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