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1 /***************************************************************************/ | |
2 /* */ | |
3 /* ftlzw.h */ | |
4 /* */ | |
5 /* LZW-compressed stream support. */ | |
6 /* */ | |
7 /* Copyright 2004, 2006 by */ | |
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
9 /* */ | |
10 /* This file is part of the FreeType project, and may only be used, */ | |
11 /* modified, and distributed under the terms of the FreeType project */ | |
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
13 /* this file you indicate that you have read the license and */ | |
14 /* understand and accept it fully. */ | |
15 /* */ | |
16 /***************************************************************************/ | |
17 | |
18 | |
19 #ifndef __FTLZW_H__ | |
20 #define __FTLZW_H__ | |
21 | |
22 #include <ft2build.h> | |
23 #include FT_FREETYPE_H | |
24 | |
25 #ifdef FREETYPE_H | |
26 #error "freetype.h of FreeType 1 has been loaded!" | |
27 #error "Please fix the directory search order for header files" | |
28 #error "so that freetype.h of FreeType 2 is found first." | |
29 #endif | |
30 | |
31 | |
32 FT_BEGIN_HEADER | |
33 | |
34 /*************************************************************************/ | |
35 /* */ | |
36 /* <Section> */ | |
37 /* lzw */ | |
38 /* */ | |
39 /* <Title> */ | |
40 /* LZW Streams */ | |
41 /* */ | |
42 /* <Abstract> */ | |
43 /* Using LZW-compressed font files. */ | |
44 /* */ | |
45 /* <Description> */ | |
46 /* This section contains the declaration of LZW-specific functions. */ | |
47 /* */ | |
48 /*************************************************************************/ | |
49 | |
50 /************************************************************************ | |
51 * | |
52 * @function: | |
53 * FT_Stream_OpenLZW | |
54 * | |
55 * @description: | |
56 * Open a new stream to parse LZW-compressed font files. This is | |
57 * mainly used to support the compressed `*.pcf.Z' fonts that come | |
58 * with XFree86. | |
59 * | |
60 * @input: | |
61 * stream :: The target embedding stream. | |
62 * | |
63 * source :: The source stream. | |
64 * | |
65 * @return: | |
66 * FreeType error code. 0~means success. | |
67 * | |
68 * @note: | |
69 * The source stream must be opened _before_ calling this function. | |
70 * | |
71 * Calling the internal function `FT_Stream_Close' on the new stream will | |
72 * *not* call `FT_Stream_Close' on the source stream. None of the stream | |
73 * objects will be released to the heap. | |
74 * | |
75 * The stream implementation is very basic and resets the decompression | |
76 * process each time seeking backwards is needed within the stream | |
77 * | |
78 * In certain builds of the library, LZW compression recognition is | |
79 * automatically handled when calling @FT_New_Face or @FT_Open_Face. | |
80 * This means that if no font driver is capable of handling the raw | |
81 * compressed file, the library will try to open a LZW stream from it | |
82 * and re-open the face with it. | |
83 * | |
84 * This function may return `FT_Err_Unimplemented_Feature' if your build | |
85 * of FreeType was not compiled with LZW support. | |
86 */ | |
87 FT_EXPORT( FT_Error ) | |
88 FT_Stream_OpenLZW( FT_Stream stream, | |
89 FT_Stream source ); | |
90 | |
91 /* */ | |
92 | |
93 | |
94 FT_END_HEADER | |
95 | |
96 #endif /* __FTLZW_H__ */ | |
97 | |
98 | |
99 /* END */ | |
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