1 /******************************************************************************
2 * $Id$
3 *
4 * Project: MapServer
5 * Purpose: MapCache tile caching support file: Mixed PNG+JPEG format
6 * Author: Thomas Bonfort and the MapServer team.
7 *
8 ******************************************************************************
9 * Copyright (c) 1996-2011 Regents of the University of Minnesota.
10 *
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies of this Software or works derived from this Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
28 *****************************************************************************/
29
30 #include "mapcache.h"
31 #include <apr_strings.h>
32
33
34 /**\addtogroup imageio_mixed */
35 /** @{ */
36
37 /**
38 * \brief encode an image to mixed format
39 * depending on the transparency of the provided image, use either one
40 * of the two member encoding formats.
41 * Intended to be used for creating png when transparency is present, and jpeg
42 * when fully opaque
43 * \sa mapcache_image_format::write()
44 */
_mapcache_imageio_mixed_encode(mapcache_context * ctx,mapcache_image * image,mapcache_image_format * format)45 static mapcache_buffer* _mapcache_imageio_mixed_encode( mapcache_context *ctx,
46 mapcache_image *image, mapcache_image_format *format)
47 {
48 mapcache_image_format_mixed *f = (mapcache_image_format_mixed*)format;
49 if(mapcache_image_has_alpha(image,f->alpha_cutoff)) {
50 return f->transparent->write(ctx,image,f->transparent);
51 } else {
52 return f->opaque->write(ctx,image,f->opaque);
53 }
54 }
55
mapcache_imageio_create_mixed_format(apr_pool_t * pool,char * name,mapcache_image_format * transparent,mapcache_image_format * opaque,unsigned int alpha_cutoff)56 mapcache_image_format* mapcache_imageio_create_mixed_format(apr_pool_t *pool,
57 char *name, mapcache_image_format *transparent, mapcache_image_format *opaque,
58 unsigned int alpha_cutoff)
59 {
60 mapcache_image_format_mixed *format = apr_pcalloc(pool, sizeof(mapcache_image_format_mixed));
61 format->format.name = name;
62 format->transparent = transparent;
63 format->opaque = opaque;
64 format->alpha_cutoff = alpha_cutoff;
65 format->format.extension = apr_pstrdup(pool,"xxx");
66 format->format.mime_type = NULL;
67 format->format.write = _mapcache_imageio_mixed_encode;
68 format->format.create_empty_image = transparent->create_empty_image;
69 format->format.metadata = apr_table_make(pool,3);
70 return (mapcache_image_format*)format;
71 }
72
73 /** @} */
74
75 /* vim: ts=2 sts=2 et sw=2
76 */
77