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- /* Copyright (C) 1989, 1992 Aladdin Enterprises. All rights reserved.
- Distributed by Free Software Foundation, Inc.
-
- This file is part of Ghostscript.
-
- Ghostscript is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- to anyone for the consequences of using it or for whether it serves any
- particular purpose or works at all, unless he says so in writing. Refer
- to the Ghostscript General Public License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- Ghostscript, but only under the conditions described in the Ghostscript
- General Public License. A copy of this license is supposed to have been
- given to you along with Ghostscript so you can know your rights and
- responsibilities. It should be in a file named COPYING. Among other
- things, the copyright notice and this notice must be preserved on all
- copies. */
-
- /* gschar.h */
- /* Character operations for Ghostscript library */
-
- /* String display, like image display, uses an enumeration structure */
- /* to keep track of what's going on (aka 'poor man's callback'). */
- typedef struct gs_show_enum_s gs_show_enum;
- extern const uint gs_show_enum_sizeof;
-
- /* The routines all come in two versions, */
- /* one that uses the C convention of null-terminated strings, */
- /* and one that supplies a length. */
- int gs_show_init(P3(gs_show_enum *, gs_state *, const char *)),
- gs_show_n_init(P4(gs_show_enum *, gs_state *, const char *, uint)),
- gs_ashow_init(P5(gs_show_enum *, gs_state *, floatp, floatp, const char *)),
- gs_ashow_n_init(P6(gs_show_enum *, gs_state *, floatp, floatp, const char *, uint)),
- gs_widthshow_init(P6(gs_show_enum *, gs_state *, floatp, floatp, char, const char *)),
- gs_widthshow_n_init(P7(gs_show_enum *, gs_state *, floatp, floatp, char, const char *, uint)),
- gs_awidthshow_init(P8(gs_show_enum *, gs_state *, floatp, floatp, char, floatp, floatp, const char *)),
- gs_awidthshow_n_init(P9(gs_show_enum *, gs_state *, floatp, floatp, char, floatp, floatp, const char *, uint)),
- gs_kshow_init(P3(gs_show_enum *, gs_state *, const char *)),
- gs_kshow_n_init(P4(gs_show_enum *, gs_state *, const char *, uint)),
- gs_stringwidth_init(P3(gs_show_enum *, gs_state *, const char *)),
- gs_stringwidth_n_init(P4(gs_show_enum *, gs_state *, const char *, uint)),
- gs_charpath_init(P4(gs_show_enum *, gs_state *, const char *, int)),
- gs_charpath_n_init(P5(gs_show_enum *, gs_state *, const char *, uint, int));
-
- /* After setting up the enumeration, all the string-related routines */
- /* work the same way. The client calls gs_show_next until it returns */
- /* a zero (successful completion) or negative (error) value. */
- /* Other values indicate the following situations: */
-
- /* The client must render a character: obtain the code from */
- /* gs_show_current_char, do whatever is necessary, and then */
- /* call gs_show_next again. */
- #define gs_show_render 1
-
- /* The client has asked to intervene between characters (kshow). */
- /* Obtain the previous and next codes from gs_kshow_previous_char */
- /* and gs_kshow_next_char, do whatever is necessary, and then */
- /* call gs_show_next again. */
- #define gs_show_kern 2
-
- /* Because of composite fonts, character codes must be 32 bits. */
- typedef ulong char_code;
-
- int gs_show_next(P1(gs_show_enum *));
- char_code
- gs_show_current_char(P1(gs_show_enum *)),
- gs_kshow_previous_char(P1(gs_show_enum *)),
- gs_kshow_next_char(P1(gs_show_enum *));
- void gs_show_width(P2(gs_show_enum *, gs_point *)); /* cumulative width */
- int gs_show_in_charpath(P1(gs_show_enum *)); /* return charpath flag */
-
- /* Font cache and metrics operators */
- int gs_setcachedevice(P8(gs_show_enum *, gs_state *, floatp, floatp, floatp, floatp, floatp, floatp));
- int gs_setcharwidth(P4(gs_show_enum *, gs_state *, floatp, floatp));
- int gs_setmetrics(P4(gs_show_enum *, gs_state *, const gs_point *, const gs_point *));
-