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- /* Copyright (C) 1993, 1995, 1996, 1997 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.
- */
-
- /* gxht.h */
- /* Rest of (client) halftone definitions */
-
- #ifndef gxht_INCLUDED
- # define gxht_INCLUDED
-
- #include "gsht1.h"
- #include "gsrefct.h"
- #include "gxhttype.h"
- #include "gxtmap.h"
-
- /* Type 1 halftone. This is just a Level 1 halftone with */
- /* a few extra members. */
- typedef struct gs_spot_halftone_s {
- gs_screen_halftone screen;
- bool accurate_screens;
- gs_mapping_proc transfer;
- } gs_spot_halftone;
- #define st_spot_halftone_max_ptrs st_screen_halftone_max_ptrs
-
- /* Type 3 halftone. */
- typedef struct gs_threshold_halftone_s {
- int width;
- int height;
- gs_const_string thresholds;
- gs_mapping_proc transfer;
- } gs_threshold_halftone;
- #define st_threshold_halftone_max_ptrs 1
-
- /* Define the separation "names" for a Type 5 halftone. */
- typedef enum {
- gs_ht_separation_Default, /* must be first */
- gs_ht_separation_Gray,
- gs_ht_separation_Red,
- gs_ht_separation_Green,
- gs_ht_separation_Blue,
- gs_ht_separation_Cyan,
- gs_ht_separation_Magenta,
- gs_ht_separation_Yellow,
- gs_ht_separation_Black
- } gs_ht_separation_name;
- #define gs_ht_separation_name_strings\
- "Default", "Gray", "Red", "Green", "Blue",\
- "Cyan", "Magenta", "Yellow", "Black"
-
- /* Define the elements of a Type 5 halftone. */
- typedef struct gs_halftone_component_s {
- gs_ht_separation_name cname;
- gs_halftone_type type;
- union {
- gs_spot_halftone spot; /* Type 1 */
- gs_threshold_halftone threshold; /* Type 3 */
- } params;
- } gs_halftone_component;
- extern_st(st_halftone_component);
- #define public_st_halftone_component() /* in gsht1.c */\
- gs_public_st_composite(st_halftone_component, gs_halftone_component,\
- "gs_halftone_component", halftone_component_enum_ptrs,\
- halftone_component_reloc_ptrs)
- extern_st(st_ht_component_element);
- #define public_st_ht_component_element() /* in gsht1.c */\
- gs_public_st_element(st_ht_component_element, gs_halftone_component,\
- "gs_halftone_component[]", ht_comp_elt_enum_ptrs, ht_comp_elt_reloc_ptrs,\
- st_halftone_component)
- #define st_halftone_component_max_ptrs\
- max(st_spot_halftone_max_ptrs, st_threshold_halftone_max_ptrs)
-
- /* Define the Type 5 halftone itself. */
- typedef struct gs_multiple_halftone_s {
- gs_halftone_component *components;
- uint num_comp;
- } gs_multiple_halftone;
- #define st_multiple_halftone_max_ptrs 1
-
- /*
- * The halftone stored in the graphics state is the union of
- * setscreen, setcolorscreen, Type 1, Type 3, and Type 5.
- *
- * NOTE: it is assumed that all subsidiary structures of halftones (the
- * threshold array(s) for Type 3 halftones or halftone components, and the
- * components array for Type 5 halftones) are allocated with the same
- * allocator as the halftone structure itself.
- */
- struct gs_halftone_s {
- gs_halftone_type type;
- rc_header rc;
- union {
- gs_screen_halftone screen; /* setscreen */
- gs_colorscreen_halftone colorscreen; /* setcolorscreen */
- gs_spot_halftone spot; /* Type 1 */
- gs_threshold_halftone threshold; /* Type 3 */
- gs_multiple_halftone multiple; /* Type 5 */
- } params;
- };
- extern_st(st_halftone);
- #define public_st_halftone() /* in gsht.c */\
- gs_public_st_composite(st_halftone, gs_halftone, "gs_halftone",\
- halftone_enum_ptrs, halftone_reloc_ptrs)
- #define st_halftone_max_ptrs\
- max(max(st_screen_halftone_max_ptrs, st_colorscreen_halftone_max_ptrs),\
- max(max(st_spot_halftone_max_ptrs, st_threshold_halftone_max_ptrs),\
- st_multiple_halftone_max_ptrs))
-
- /* Procedural interface for AccurateScreens */
-
- /* Set/get the default AccurateScreens value (for set[color]screen). */
- /* Note that this value is stored in a static variable. */
- void gs_setaccuratescreens(P1(bool));
- bool gs_currentaccuratescreens(P0());
-
- /* Initiate screen sampling with optional AccurateScreens. */
- int gs_screen_init_memory(P5(gs_screen_enum *, gs_state *,
- gs_screen_halftone *, bool, gs_memory_t *));
- #define gs_screen_init_accurate(penum, pgs, phsp, accurate)\
- gs_screen_init_memory(penum, pgs, phsp, accurate, pgs->memory)
-
- /* Procedural interface for MinScreenLevels (a Ghostscript extension) */
-
- /* Set/get the MinScreenLevels value. */
- /* Note that this value is stored in a static variable. */
- void gs_setminscreenlevels(P1(uint));
- uint gs_currentminscreenlevels(P0());
-
- #endif /* gxht_INCLUDED */
-