harvey/sys/src/cmd/gs/src/gspcolor.h

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/*$Id: gspcolor.h,v 1.2 2000/09/19 19:00:31 lpd Exp $ */
/* Client interface to Pattern color */

#ifndef gspcolor_INCLUDED
#  define gspcolor_INCLUDED

#include "gsccolor.h"
#include "gsrefct.h"
#include "gsuid.h"

/* ---------------- Types and structures ---------------- */

/*
 * We originally defined the gs_client_pattern structure before we
 * realized that we would have to accommodate multiple PatternTypes.
 * In version 5.68, we bit the bullet and made an incompatible change
 * to this structure so that multiple PatternTypes could be supported.
 * In order to make this work:
 *
 *	Clients creating instances of any Pattern template structure
 *	(gs_patternN_template_t) must call gs_patternN_init to
 *	initialize all the members, before filling in any of the
 *	members themselves.
 *
 * This is a non-backward-compatible requirement relative to previous
 * versions, but it was unavoidable.
 */

/*
 * Define the abstract pattern template (called "prototype pattern" in Red
 * Book).
 */

#ifndef gs_pattern_type_DEFINED
#  define gs_pattern_type_DEFINED
typedef struct gs_pattern_type_s gs_pattern_type_t;
#endif

#define gs_pattern_template_common\
  const gs_pattern_type_t *type;\
  int PatternType;		/* copied from the type structure */\
  gs_uid uid;\
  void *client_data		/* additional data for rendering */

typedef struct gs_pattern_template_s {
    gs_pattern_template_common;
} gs_pattern_template_t;

/* The descriptor is public for subclassing. */
extern_st(st_pattern_template);
#define public_st_pattern_template() /* in gspcolor.c */\
  gs_public_st_ptrs2(st_pattern_template, gs_pattern_template_t,\
    "gs_pattern_template_t", pattern_template_enum_ptrs,\
    pattern_template_reloc_ptrs, uid.xvalues, client_data)
#define st_pattern_template_max_ptrs 2

/* Definition of Pattern instances. */
#ifndef gs_pattern_instance_DEFINED
#  define gs_pattern_instance_DEFINED
typedef struct gs_pattern_instance_s gs_pattern_instance_t;
#endif

#define gs_pattern_instance_common\
    rc_header rc;\
    /* Following are set by makepattern */\
    const gs_pattern_type_t *type;  /* from template */\
    gs_state *saved
struct gs_pattern_instance_s {
    gs_pattern_instance_common;
};

/* The following is public for subclassing. */
extern_st(st_pattern_instance);
#define public_st_pattern_instance() /* in gspcolor.c */\
  gs_public_st_ptrs1(st_pattern_instance, gs_pattern_instance_t,\
    "gs_pattern_instance_t", pattern_instance_enum_ptrs,\
    pattern_instance_reloc_ptrs, saved)
#define st_pattern_instance_max_ptrs 1

/* ---------------- Procedures ---------------- */

/* Set a Pattern color or a Pattern color space. */
int gs_setpattern(P2(gs_state *, const gs_client_color *));
int gs_setpatternspace(P1(gs_state *));

/*
 * Construct a Pattern color of any PatternType.
 * The gs_memory_t argument for gs_make_pattern may be NULL, meaning use the
 * same allocator as for the gs_state argument.  Note that gs_make_pattern
 * uses rc_alloc_struct_1 to allocate pattern instances.
 */
int gs_make_pattern(P5(gs_client_color *, const gs_pattern_template_t *,
		       const gs_matrix *, gs_state *, gs_memory_t *));
const gs_pattern_template_t *gs_get_pattern(P1(const gs_client_color *));

/*
 * Adjust the reference count of a pattern. This is intended to support
 * applications (such as PCL) which maintain client colors outside of the
 * graphic state. Since the pattern instance structure is opaque to these
 * applications, they need some way to release or retain the instances as
 * needed.
 */
void gs_pattern_reference(P2(gs_client_color * pcc, int delta));

#endif /* gspcolor_INCLUDED */