source: golgotha/src/i4/quantize/histogram.hh

Last change on this file was 80, checked in by Sam Hocevar, 11 years ago
  • Adding the Golgotha source code. Not sure what's going to be interesting in there, but since it's all public domain, there's certainly stuff to pick up.
File size: 1.9 KB
Line 
1/********************************************************************** <BR>
2  This file is part of Crack dot Com's free source code release of
3  Golgotha. <a href="http://www.crack.com/golgotha_release"> <BR> for
4  information about compiling & licensing issues visit this URL</a>
5  <PRE> If that doesn't help, contact Jonathan Clark at
6  golgotha_source@usa.net (Subject should have "GOLG" in it)
7***********************************************************************/
8
9#ifndef HISTOGRAM_HH
10#define HISTOGRAM_HH
11
12#include "arch.hh"
13#include "image/image.hh"
14
15class i4_file_class;
16
17class i4_histogram_class
18{
19  public :
20  enum { HIST_SIZE=0x10000,  // 16 bit histogram table
21         MAX_COLORS=256 };
22
23  w16 reference[HIST_SIZE];
24  w32 counts[HIST_SIZE];
25  w32 tcolors;              // total original colors in the histogram [length of reference]
26  w32 total_pixels;         // total pixels accounted for in image (affected by counts_per_pixel)
27
28
29  i4_histogram_class();
30 
31  void increment_color(w16 color,  // this is expected to be a 16 bit color (5 6 5)
32                       w32 count)
33  {
34    if (!counts[color])            // is this an original color?
35    {
36      reference[tcolors]=color;    // add this color to the reference list
37      tcolors++;
38    }
39    counts[color]+=count;          // increment the counter for this color
40    total_pixels+=count;           // count total pixels we've looked at
41  }
42
43  void reset()
44  {
45    for (int i=0; i<tcolors; i++)   
46      counts[reference[i]]=0;
47    tcolors=0;
48    total_pixels=0;
49  }
50
51  void save(i4_file_class *fp);
52  void load(i4_file_class *fp);
53
54  // counts_per_pixel can be used to give smaller images more emphasis
55  // I use this to give mip maps of original images more double emphasis
56  // right now only image's of type i4_image32 will work
57  void add_image_colors(i4_image_class *image, int counts_per_pixel=1);
58
59} ;
60
61
62
63#endif
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