/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id$ */
/* Private graphics state definition for Ghostscript library */

#ifndef gzstate_INCLUDED
#  define gzstate_INCLUDED

#include "gscpm.h"
#include "gscspace.h"
#include "gsrefct.h"
#include "gxdcolor.h"
#include "gxistate.h"
#include "gsstate.h"
#include "gxstate.h"

/* Opaque types referenced by the graphics state. */
#ifndef gx_path_DEFINED
#  define gx_path_DEFINED
typedef struct gx_path_s gx_path;
#endif
#ifndef gx_clip_path_DEFINED
#  define gx_clip_path_DEFINED
typedef struct gx_clip_path_s gx_clip_path;
#endif
#ifndef gx_clip_stack_DEFINED
#  define gx_clip_stack_DEFINED
typedef struct gx_clip_stack_s gx_clip_stack_t;
#endif
#ifndef gs_color_space_DEFINED
#  define gs_color_space_DEFINED
typedef struct gs_color_space_s gs_color_space;
#endif
#ifndef gs_client_color_DEFINED
#  define gs_client_color_DEFINED
typedef struct gs_client_color_s gs_client_color;
#endif
#ifndef gs_font_DEFINED
#  define gs_font_DEFINED
typedef struct gs_font_s gs_font;
#endif
#ifndef gs_transparency_group_DEFINED
#  define gs_transparency_group_DEFINED
typedef struct gs_transparency_group_s gs_transparency_group_t;
#endif
#ifndef gs_device_filter_stack_DEFINED
#  define gs_device_filter_stack_DEFINED
typedef struct gs_device_filter_stack_s gs_device_filter_stack_t;
#endif

/* Device filter stack structure is defined here so that gstate
   lifecycle operations can access reference count; implementation is
   in gsdfilt.c.
 */

#ifndef gs_device_filter_DEFINED
#  define gs_device_filter_DEFINED
typedef struct gs_device_filter_s gs_device_filter_t;
#endif

/* This is the base structure from which device filters are derived. */
struct gs_device_filter_stack_s {
    gs_device_filter_stack_t *next;
    gs_device_filter_t *df;
    gx_device *next_device;
    rc_header rc;
};

/* Graphics state structure. */

struct gs_state_s {
    gs_imager_state_common;	/* imager state, must be first */
    gs_state *saved;		/* previous state from gsave */

    /* Transformation: */

    gs_matrix ctm_inverse;
    bool ctm_inverse_valid;	/* true if ctm_inverse = ctm^-1 */
    gs_matrix ctm_default;
    bool ctm_default_set;	/* if true, use ctm_default; */
				/* if false, ask device */
    /* Paths: */

    gx_path *path;
    gx_clip_path *clip_path;
    gx_clip_stack_t *clip_stack;  /* (LanguageLevel 3 only) */
    gx_clip_path *view_clip;	/* (may be 0, or have rule = 0) */

    /* Effective clip path cache */
    gs_id effective_clip_id;	/* (key) clip path id */
    gs_id effective_view_clip_id;	/* (key) view clip path id */
    gx_clip_path *effective_clip_path;	/* (value) effective clip path, */
				/* possibly = clip_path or view_clip */
    bool effective_clip_shared;	/* true iff e.c.p. = c.p. or v.c. */

#define gs_currentdevicecolor_inline(pgs) \
    ((pgs)->color[0].dev_color)
#define gs_currentcolor_inline(pgs) \
    ((pgs)->color[0].ccolor)
#define gs_currentcolorspace_inline(pgs) \
    ((pgs)->color[0].color_space)
#define gs_altdevicecolor_inline(pgs) \
    ((pgs)->color[1].dev_color)

    /* Current colors (non-stroking, and stroking) */
    struct {
        gs_color_space *color_space; /* after substitution */
        gs_client_color *ccolor;
        gx_device_color *dev_color;
    } color[2];
    
    /* Font: */

    gs_font *font;
    gs_font *root_font;
    gs_matrix_fixed char_tm;	/* font matrix * ctm */
#define char_tm_only(pgs) *(gs_matrix *)&(pgs)->char_tm
    bool char_tm_valid;		/* true if char_tm is valid */
    gs_in_cache_device_t in_cachedevice;    /* (see gscpm.h) */
    gs_char_path_mode in_charpath;	/* (see gscpm.h) */
    gs_state *show_gstate;	/* gstate when show was invoked */
				/* (so charpath can append to path) */

    /* Other stuff: */

    int level;			/* incremented by 1 per gsave */
    gx_device *device;
#undef gs_currentdevice_inline
#define gs_currentdevice_inline(pgs) ((pgs)->device)
    gs_device_filter_stack_t *dfilter_stack;

    gs_transparency_group_t *transparency_group_stack; /* (PDF 1.4 only) */

    /* Client data: */

    /*void *client_data;*/	/* in imager state */
#define gs_state_client_data(pgs) ((pgs)->client_data)
    gs_state_client_procs client_procs;
};

#define public_st_gs_state()	/* in gsstate.c */\
  gs_public_st_composite(st_gs_state, gs_state, "gs_state",\
    gs_state_enum_ptrs, gs_state_reloc_ptrs)

/*
 * Enumerate the pointers in a graphics state, other than the ones in the
 * imager state, and device, which must be handled specially.
 */
#define gs_state_do_ptrs(m)\
  m(0,saved) m(1,path) m(2,clip_path) m(3,clip_stack)\
  m(4,view_clip) m(5,effective_clip_path)\
  m(6,color[0].color_space) m(7,color[0].ccolor) m(8,color[0].dev_color)\
  m(9,color[1].color_space) m(10,color[1].ccolor) m(11,color[1].dev_color)\
  m(12,font) m(13,root_font) m(14,show_gstate) /*m(---,device)*/\
  m(15,transparency_group_stack)
#define gs_state_num_ptrs 16

/* The following macro is used for development purpose for designating places 
   where current point is changed. Clients must not use it. */
#define gx_setcurrentpoint(pgs, xx, yy)\
    (pgs)->current_point.x = xx;\
    (pgs)->current_point.y = yy;

int gs_swapcolors(gs_state *);
void gs_swapcolors_quick(gs_state *);

#endif /* gzstate_INCLUDED */