1 /* Copyright (C) 1994, 1997 Aladdin Enterprises. All rights reserved. 2 3 This software is provided AS-IS with no warranty, either express or 4 implied. 5 6 This software is distributed under license and may not be copied, 7 modified or distributed except as expressly authorized under the terms 8 of the license contained in the file LICENSE in this distribution. 9 10 For more information about licensing, please refer to 11 http://www.ghostscript.com/licensing/. For information on 12 commercial licensing, go to http://www.artifex.com/licensing/ or 13 contact Artifex Software, Inc., 101 Lucas Valley Road #110, 14 San Rafael, CA 94903, U.S.A., +1(415)492-9861. 15 */ 16 17 /* $Id: gsht1.h,v 1.5 2002/06/16 08:45:42 lpd Exp $ */ 18 /* Extended public interface to halftones */ 19 20 #ifndef gsht1_INCLUDED 21 # define gsht1_INCLUDED 22 23 #include "gsht.h" 24 25 /* Procedural interface */ 26 int gs_setcolorscreen(gs_state *, gs_colorscreen_halftone *); 27 int gs_currentcolorscreen(gs_state *, gs_colorscreen_halftone *); 28 29 /* 30 * We include sethalftone here, even though it is a Level 2 feature, 31 * because it turns out to be convenient to define setcolorscreen 32 * using sethalftone. 33 */ 34 #ifndef gs_halftone_DEFINED 35 # define gs_halftone_DEFINED 36 typedef struct gs_halftone_s gs_halftone; 37 38 #endif 39 /* 40 * gs_halftone structures may have complex substructures. We provide two 41 * procedures for setting them. gs_halftone assumes that the gs_halftone 42 * structure and all its substructures was allocated with the same allocator 43 * as the gs_state; gs_halftone_allocated looks in the structure itself (the 44 * rc.memory member) to find the allocator that was used. Both procedures 45 * copy the top-level structure (using the appropriate allocator), but take 46 * ownership of the substructures. 47 */ 48 int gs_sethalftone(gs_state *, gs_halftone *); 49 int gs_sethalftone_allocated(gs_state *, gs_halftone *); 50 int gs_currenthalftone(gs_state *, gs_halftone *); 51 52 #endif /* gsht1_INCLUDED */ 53