1 /****************************************************************************
5 * LZW-compressed stream support.
7 * Copyright (C) 2004-2023 by
8 * David Turner, Robert Wilhelm, and Werner Lemberg.
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.
22 #include <freetype/freetype.h>
25 #error "freetype.h of FreeType 1 has been loaded!"
26 #error "Please fix the directory search order for header files"
27 #error "so that freetype.h of FreeType 2 is found first."
33 /**************************************************************************
42 * Using LZW-compressed font files.
45 * In certain builds of the library, LZW compression recognition is
46 * automatically handled when calling @FT_New_Face or @FT_Open_Face.
47 * This means that if no font driver is capable of handling the raw
48 * compressed file, the library will try to open a LZW stream from it and
49 * re-open the face with it.
51 * The stream implementation is very basic and resets the decompression
52 * process each time seeking backwards is needed within the stream,
53 * which significantly undermines the performance.
55 * This section contains the declaration of LZW-specific functions.
59 /**************************************************************************
65 * Open a new stream to parse LZW-compressed font files. This is mainly
66 * used to support the compressed `*.pcf.Z` fonts that come with XFree86.
70 * The target embedding stream.
76 * FreeType error code. 0~means success.
79 * The source stream must be opened _before_ calling this function.
81 * Calling the internal function `FT_Stream_Close` on the new stream will
82 * **not** call `FT_Stream_Close` on the source stream. None of the
83 * stream objects will be released to the heap.
85 * This function may return `FT_Err_Unimplemented_Feature` if your build
86 * of FreeType was not compiled with LZW support.
89 FT_Stream_OpenLZW( FT_Stream stream,