source: libpipi/trunk/pipi/combine/blit.c @ 3560

Last change on this file since 3560 was 3560, checked in by Sam Hocevar, 11 years ago

Add missing blit.c to repository.

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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: blit.c 3560 2009-07-22 07:14:03Z 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_blit(pipi_image_t *img1, pipi_image_t *img2, int x, int y)
27{
28    pipi_image_t *dst;
29    pipi_pixels_t *img1p, *img2p, *dstp;
30    float *img1data, *img2data, *dstdata;
31    int dx, dy, w1, h1, w2, h2;
32
33    w1 = img1->w;
34    h1 = img1->h;
35    w2 = img2->w;
36    h2 = img2->h;
37
38    dst = pipi_copy(img1);
39    dstp = pipi_get_pixels(dst, PIPI_PIXELS_RGBA_F32);
40    dstdata = (float *)dstp->pixels;
41
42    img1p = pipi_get_pixels(img1, PIPI_PIXELS_RGBA_F32);
43    img1data = (float *)img1p->pixels;
44    img2p = pipi_get_pixels(img2, PIPI_PIXELS_RGBA_F32);
45    img2data = (float *)img2p->pixels;
46
47    for(dy = 0; dy < h2; dy++)
48    {
49        if (y + dy < 0)
50            continue;
51
52        if (y + dy >= h1)
53            break;
54
55        for(dx = 0; dx < w2; dx++)
56        {
57            float p, q;
58            double t1, t2;
59
60            if (x + dx < 0)
61                continue;
62
63            if (x + dx >= w1)
64                break;
65
66            t1 = img2data[4 * (dy * w2 + dx) + 3];
67            t2 = 1.0 - t1;
68
69            p = img1data[4 * ((y + dy) * w1 + (x + dx))];
70            q = img2data[4 * (dy * w2 + dx)];
71            dstdata[4 * ((y + dy) * w1 + (x + dx))] = t2 * p + t1 * q;
72
73            p = img1data[4 * ((y + dy) * w1 + (x + dx)) + 1];
74            q = img2data[4 * (dy * w2 + dx) + 1];
75            dstdata[4 * ((y + dy) * w1 + (x + dx)) + 1] = t2 * p + t1 * q;
76
77            p = img1data[4 * ((y + dy) * w1 + (x + dx)) + 2];
78            q = img2data[4 * (dy * w2 + dx) + 2];
79            dstdata[4 * ((y + dy) * w1 + (x + dx)) + 2] = t2 * p + t1 * q;
80
81            p = img1data[4 * ((y + dy) * w1 + (x + dx)) + 3];
82            q = img2data[4 * (dy * w2 + dx) + 3];
83            dstdata[4 * ((y + dy) * w1 + (x + dx)) + 3] = t2 * p + t1 * q;
84        }
85    }
86
87    return dst;
88}
89
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