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- /* Copyright (C) 1989, 1992, 1993, 1994 Aladdin Enterprises. All rights reserved.
-
- This file is part of Aladdin Ghostscript.
-
- Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
- or distributor accepts any responsibility for the consequences of using it,
- or for whether it serves any particular purpose or works at all, unless he
- or she says so in writing. Refer to the Aladdin Ghostscript Free Public
- License (the "License") for full details.
-
- Every copy of Aladdin Ghostscript must include a copy of the License,
- normally in a plain ASCII text file named PUBLIC. The License grants you
- the right to copy, modify and redistribute Aladdin Ghostscript, but only
- under certain conditions described in the License. Among other things, the
- License requires that the copyright notice and this notice be preserved on
- all copies.
- */
-
- /* gschar.h */
- /* Client interface to character operations */
- #include "gsccode.h"
-
- /* String display, like image display, uses an enumeration structure */
- /* to keep track of what's going on (aka 'poor man's coroutine'). */
- #ifndef gs_show_enum_DEFINED
- # define gs_show_enum_DEFINED
- typedef struct gs_show_enum_s gs_show_enum;
- #endif
-
- gs_show_enum *gs_show_enum_alloc(P2(gs_memory_t *, client_name_t));
- /* The initialization 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, gs_char, const char *)),
- gs_widthshow_n_init(P7(gs_show_enum *, gs_state *, floatp, floatp, gs_char, const char *, uint)),
- gs_awidthshow_init(P8(gs_show_enum *, gs_state *, floatp, floatp, gs_char, floatp, floatp, const char *)),
- gs_awidthshow_n_init(P9(gs_show_enum *, gs_state *, floatp, floatp, gs_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_xyshow_init(P3(gs_show_enum *, gs_state *, const char *)),
- gs_xyshow_n_init(P4(gs_show_enum *, gs_state *, const char *, uint)),
- gs_glyphshow_init(P3(gs_show_enum *, gs_state *, gs_glyph)),
- gs_cshow_init(P3(gs_show_enum *, gs_state *, const char *)),
- gs_cshow_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
-
- /* The client has asked to handle characters individually */
- /* (xshow, yshow, xyshow, cshow). Obtain the current code */
- /* from gs_show_current_char, do whatever is necessary, and then */
- /* call gs_show_next again. */
- #define gs_show_move 3
-
- int gs_show_next(P1(gs_show_enum *));
- gs_char
- gs_show_current_char(P1(const gs_show_enum *)),
- gs_kshow_previous_char(P1(const gs_show_enum *)),
- gs_kshow_next_char(P1(const gs_show_enum *));
- gs_glyph
- gs_show_current_glyph(P1(const gs_show_enum *));
- int gs_show_current_width(P2(const gs_show_enum *, gs_point *));
- void gs_show_width(P2(const gs_show_enum *, gs_point *)); /* cumulative width */
- int gs_show_in_charpath(P1(const gs_show_enum *)); /* return charpath flag */
-
- /* Character cache and metrics operators. */
- int gs_setcachedevice(P3(gs_show_enum *, gs_state *, const float * /*[6]*/));
- int gs_setcachedevice2(P3(gs_show_enum *, gs_state *, const float * /*[10]*/));
- int gs_setcharwidth(P4(gs_show_enum *, gs_state *, floatp, floatp));
- /* Return true if we only need the width from the rasterizer, */
- /* false if we need the actual character bits. */
- /* This is only meaningful just before calling gs_setcharwidth or */
- /* gs_setcachedevice[2]. */
- bool gs_show_width_only(P1(const gs_show_enum *));
-
- /* Define the scale for oversampling. Clients don't actually use this, */
- /* but this seemed like the handiest place for it. */
- typedef struct gs_log2_scale_point_s {
- int x, y;
- } gs_log2_scale_point;
-