source: libpipi/trunk/pipi/combine/merge.c @ 3411

Last change on this file since 3411 was 3411, checked in by Sam Hocevar, 12 years ago

mean.c: rename this file into merge.c and implement pipi_merge() for trivial
image merging.

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File size: 2.2 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: merge.c 3411 2009-03-24 00:49:00Z sam $
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_merge(pipi_image_t *img1, pipi_image_t *img2, double t)
27{
28    pipi_image_t *dst;
29    pipi_pixels_t *img1p, *img2p, *dstp;
30    float *img1data, *img2data, *dstdata;
31    double t2;
32    int x, y, w, h;
33
34    if(img1->w != img2->w || img1->h != img2->h)
35        return NULL;
36
37    if(t < 0.0)
38        t = 0.0;
39    else if(t > 1.0)
40        t = 1.0;
41    t2 = 1.0 - t;
42
43    w = img1->w;
44    h = img1->h;
45
46    dst = pipi_new(w, h);
47    dstp = pipi_get_pixels(dst, PIPI_PIXELS_RGBA_F32);
48    dstdata = (float *)dstp->pixels;
49
50    img1p = pipi_get_pixels(img1, PIPI_PIXELS_RGBA_F32);
51    img1data = (float *)img1p->pixels;
52    img2p = pipi_get_pixels(img2, PIPI_PIXELS_RGBA_F32);
53    img2data = (float *)img2p->pixels;
54
55    for(y = 0; y < h; y++)
56    {
57        for(x = 0; x < w; x++)
58        {
59            float p, q;
60
61            p = img1data[4 * (y * w + x)];
62            q = img2data[4 * (y * w + x)];
63            dstdata[4 * (y * w + x)] = t * p + t2 * q;
64
65            p = img1data[4 * (y * w + x) + 1];
66            q = img2data[4 * (y * w + x) + 1];
67            dstdata[4 * (y * w + x) + 1] = t * p + t2 * q;
68
69            p = img1data[4 * (y * w + x) + 2];
70            q = img2data[4 * (y * w + x) + 2];
71            dstdata[4 * (y * w + x) + 2] = t * p + t2 * q;
72
73            p = img1data[4 * (y * w + x) + 3];
74            q = img2data[4 * (y * w + x) + 3];
75            dstdata[4 * (y * w + x) + 3] = t * p + t2 * q;
76        }
77    }
78
79    return dst;
80}
81
82pipi_image_t *pipi_mean(pipi_image_t *img1, pipi_image_t *img2)
83{
84    return pipi_merge(img1, img2, 0.5);
85}
86
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