source: libpipi/trunk/pipi/combine/mean.c @ 3342

Last change on this file since 3342 was 3342, checked in by Sam Hocevar, 13 years ago

Change _C pixel format suffixes into _U8 for more clarity.

File size: 1.9 KB
Line 
1/*
2 *  libpipi       Pathetic image processing interface library
3 *  Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org>
4 *                All Rights Reserved
5 *
6 *  $Id$
7 *
8 *  This library is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15/*
16 * mean.c: Mean computation function
17 */
18
19#include "config.h"
20
21#include <stdlib.h>
22
23#include "pipi.h"
24#include "pipi_internals.h"
25
26pipi_image_t *pipi_mean(pipi_image_t *img1, pipi_image_t *img2)
27{
28    pipi_image_t *dst;
29    pipi_pixels_t *img1p, *img2p, *dstp;
30    float *img1data, *img2data, *dstdata;
31    int x, y, w, h;
32
33    if(img1->w != img2->w || img1->h != img2->h)
34        return NULL;
35
36    w = img1->w;
37    h = img1->h;
38
39    dst = pipi_new(w, h);
40    dstp = pipi_get_pixels(dst, PIPI_PIXELS_RGBA_F32);
41    dstdata = (float *)dstp->pixels;
42
43    img1p = pipi_get_pixels(img1, PIPI_PIXELS_RGBA_F32);
44    img1data = (float *)img1p->pixels;
45    img2p = pipi_get_pixels(img2, PIPI_PIXELS_RGBA_F32);
46    img2data = (float *)img2p->pixels;
47
48    for(y = 0; y < h; y++)
49    {
50        for(x = 0; x < w; x++)
51        {
52            float p, q;
53
54            p = img1data[4 * (y * w + x)];
55            q = img2data[4 * (y * w + x)];
56            dstdata[4 * (y * w + x)] = (p + q) * 0.5;
57
58            p = img1data[4 * (y * w + x) + 1];
59            q = img2data[4 * (y * w + x) + 1];
60            dstdata[4 * (y * w + x) + 1] = (p + q) * 0.5;
61
62            p = img1data[4 * (y * w + x) + 2];
63            q = img2data[4 * (y * w + x) + 2];
64            dstdata[4 * (y * w + x) + 2] = (p + q) * 0.5;
65
66            p = img1data[4 * (y * w + x) + 3];
67            q = img2data[4 * (y * w + x) + 3];
68            dstdata[4 * (y * w + x) + 3] = (p + q) * 0.5;
69        }
70    }
71
72    return dst;
73}
74
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