source: libpipi/trunk/pipi/paint/tile.c @ 2717

Last change on this file since 2717 was 2717, checked in by sam, 6 years ago
  • Add pipi_tile, to create image mosaics.
File size: 1.3 KB
Line 
1/*
2 *  libpipi       Proper image processing implementation 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 * tile.c: Tiling function
17 */
18
19#include "config.h"
20#include "common.h"
21
22#include "pipi.h"
23#include "pipi_internals.h"
24
25pipi_image_t *pipi_tile(pipi_image_t *tile, int w, int h)
26{
27    pipi_image_t *dst;
28    pipi_pixels_t *tilep, *dstp;
29    float *tiledata, *dstdata;
30    int x, y, tw, th, todo;
31
32    tw = tile->w;
33    th = tile->h;
34
35    dst = pipi_new(w, h);
36    dstp = pipi_getpixels(dst, PIPI_PIXELS_RGBA_F);
37    dstdata = (float *)dstp->pixels;
38
39    tilep = pipi_getpixels(tile, PIPI_PIXELS_RGBA_F);
40    tiledata = (float *)tilep->pixels;
41
42    for(y = 0; y < h; y++)
43    {
44        for(x = 0; x < w; x += todo)
45        {
46            todo = (x + tw > w) ? w - x : tw;
47            memcpy(dstdata + 4 * (y * w + x),
48                   tiledata + 4 * (y % th) * tw,
49                   4 * todo * sizeof(float));
50        }
51    }
52
53    return dst;
54}
55
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