home *** CD-ROM | disk | FTP | other *** search
- /* 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.
- */
-
- /* zcsindex.c */
- /* Indexed color space support */
- #include "memory_.h"
- #include "ghost.h"
- #include "errors.h"
- #include "oper.h"
- #include "gsstruct.h"
- #include "gscolor.h"
- #include "gsmatrix.h" /* for gxcolor2.h */
- #include "gxcspace.h"
- #include "gxfixed.h" /* ditto */
- #include "gxcolor2.h"
- #include "estack.h"
- #include "ialloc.h"
- #include "icsmap.h"
- #include "igstate.h"
- #include "ivmspace.h"
- #include "store.h"
-
- /* Imported from gscolor2.c */
- extern const gs_color_space_type gs_color_space_type_Indexed;
-
- /* Forward references. */
- private int indexed_map1(P1(os_ptr));
-
- /* Free the map when freeing the gs_indexed_map structure. */
- private void
- rc_free_indexed_map(gs_memory_t *mem, void *data, client_name_t cname)
- { /*
- * A bug in the SGI Irix 4.05 compiler requires the following:
- */
- char *cdata = (char *)data;
- gs_free_object(mem, ((gs_indexed_map *)cdata)->values, cname);
- gs_free_object(mem, cdata, cname);
- }
-
- /* Indexed lookup procedure that just consults the cache. */
- private int
- lookup_indexed(const gs_indexed_params *params, int index, float *values)
- { int m = params->base_space.type->num_components;
- const float *pv = ¶ms->lookup.map->values[index * m];
- switch ( m )
- {
- default: return_error(e_rangecheck);
- case 4: values[3] = pv[3];
- case 3: values[2] = pv[2];
- values[1] = pv[1];
- case 1: values[0] = pv[0];
- }
- return 0;
- }
-
- /* <array> .setindexedspace - */
- /* The current color space is the base space for the indexed space. */
- private int
- zsetindexedspace(register os_ptr op)
- { ref *pproc = &istate->colorspace.procs.special.index_proc;
- const ref *pcsa;
- gs_color_space cs;
- gs_base_color_space cs_base;
- ref_colorspace cspace_old;
- uint edepth = ref_stack_count(&e_stack);
- int num_entries;
- int code;
-
- check_read_type(*op, t_array);
- if ( r_size(op) != 4 )
- return_error(e_rangecheck);
- pcsa = op->value.const_refs + 1;
- check_type_only(pcsa[1], t_integer);
- if ( pcsa[1].value.intval < 0 || pcsa[1].value.intval > 4095 )
- return_error(e_rangecheck);
- num_entries = (int)pcsa[1].value.intval + 1;
- cs = *gs_currentcolorspace(igs);
- if ( !cs.type->can_be_base_space )
- return_error(e_rangecheck);
- cspace_old = istate->colorspace;
- /*
- * We can't count on C compilers to recognize the aliasing
- * that would be involved in a direct assignment.
- * Formerly, we used the following code:
- cs_base = *(gs_base_color_space *)&cs;
- cs.params.indexed.base_space = cs_base;
- * But the Watcom C 10.0 compiler is too smart: it turns this into
- * a direct assignment (and compiles incorrect code for it),
- * defeating our purpose. Instead, we have to do it by brute force:
- */
- memcpy(&cs_base, &cs, sizeof(gs_base_color_space));
- cs.params.indexed.base_space = cs_base;
- if ( r_has_type(&pcsa[2], t_string) )
- { int num_values = num_entries * cs.type->num_components;
- check_read(pcsa[2]);
- if ( r_size(&pcsa[2]) != num_values )
- return_error(e_rangecheck);
- cs.params.indexed.lookup.table.data =
- pcsa[2].value.const_bytes;
- cs.params.indexed.use_proc = 0;
- make_null(pproc);
- code = 0;
- }
- else
- { gs_indexed_map *map;
- check_proc(pcsa[2]);
- code = zcs_begin_map(&map, &pcsa[2], num_entries,
- (const gs_base_color_space *)&cs,
- indexed_map1);
- if ( code < 0 )
- return code;
- cs.params.indexed.use_proc = 1;
- *pproc = pcsa[2];
- map->proc.lookup_index = lookup_indexed;
- cs.params.indexed.lookup.map = map;
- }
- cs.params.indexed.hival = num_entries - 1;
- cs.type = &gs_color_space_type_Indexed;
- code = gs_setcolorspace(igs, &cs);
- if ( code < 0 )
- { istate->colorspace = cspace_old;
- ref_stack_pop_to(&e_stack, edepth);
- return code;
- }
- pop(1);
- return (ref_stack_count(&e_stack) == edepth ? 0 : o_push_estack); /* installation will load the caches */
- }
-
- /* Continuation procedure for saving mapped Indexed color values. */
- private int
- indexed_map1(os_ptr op)
- { es_ptr ep = esp;
- int i = (int)ep[csme_index].value.intval;
- if ( i >= 0 ) /* i.e., not first time */
- { int m = (int)ep[csme_num_components].value.intval;
- int code = num_params(op, m, &r_ptr(&ep[csme_map], gs_indexed_map)->values[i * m]);
- if ( code < 0 )
- return code;
- pop(m); op -= m;
- if ( i == (int)ep[csme_hival].value.intval )
- { /* All done. */
- esp -= num_csme;
- return o_pop_estack;
- }
- }
- push(1);
- ep[csme_index].value.intval = ++i;
- make_int(op, i);
- make_op_estack(ep + 1, indexed_map1);
- ep[2] = ep[csme_proc]; /* lookup proc */
- esp = ep + 2;
- return o_push_estack;
- }
-
- /* ------ Initialization procedure ------ */
-
- BEGIN_OP_DEFS(zcsindex_l2_op_defs) {
- op_def_begin_level2(),
- {"1.setindexedspace", zsetindexedspace},
- /* Internal operators */
- {"1%indexed_map1", indexed_map1},
- END_OP_DEFS(0) }
-
- /* ------ Internal routines ------ */
-
- /* Allocate, and prepare to load, the index or tint map. */
- int
- zcs_begin_map(gs_indexed_map **pmap, const ref *pproc, int num_entries,
- const gs_base_color_space *base_space, int (*map1)(P1(os_ptr)))
- { gs_memory_t *mem = gs_state_memory(igs);
- int num_components = base_space->type->num_components;
- int num_values = num_entries * num_components;
- gs_indexed_map *map;
- es_ptr ep;
- float *values;
- rc_alloc_struct_0(map, gs_indexed_map, &st_indexed_map,
- mem, return_error(e_VMerror),
- "setcolorspace(mapped)");
- values =
- (float *)gs_alloc_byte_array(mem, num_values, sizeof(float),
- "setcolorspace(mapped)");
- if ( values == 0 )
- { gs_free_object(mem, map, "setcolorspace(mapped)");
- return_error(e_VMerror);
- }
- map->rc.free = rc_free_indexed_map;
- map->num_values = num_values;
- map->values = values;
- *pmap = map;
- /* Map the entire set of color indices. Since the */
- /* o-stack may not be able to hold 4*4096 values, we have */
- /* to load them into the cache as they are generated. */
- check_estack(num_csme + 1); /* 1 extra for map1 proc */
- ep = esp += num_csme;
- make_int(ep + csme_num_components, num_components);
- make_struct(ep + csme_map, imemory_space((gs_ref_memory_t *)mem), map);
- ep[csme_proc] = *pproc;
- make_int(ep + csme_hival, num_entries - 1);
- make_int(ep + csme_index, -1);
- push_op_estack(map1);
- return o_push_estack;
- }
-