home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1989, 1992, 1993, 1994, 1996 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.
- */
-
- /* zcolor.c */
- /* Color operators */
- #include "ghost.h"
- #include "errors.h"
- #include "oper.h"
- #include "estack.h"
- #include "ialloc.h"
- #include "igstate.h"
- #include "iutil.h"
- #include "store.h"
- #include "gxfixed.h"
- #include "gxmatrix.h"
- #include "gzstate.h"
- #include "gxdevice.h"
- #include "gxcmap.h"
- #include "icolor.h"
-
- /* Import the 'for' operator */
- extern int
- zfor_fraction(P1(os_ptr));
-
- /* Imported from gsht.c */
- void gx_set_effective_transfer(P1(gs_state *));
-
- /* Define the number of stack slots needed for zcolor_remap_one. */
- const int zcolor_remap_one_ostack = 4;
- const int zcolor_remap_one_estack = 3;
-
- /* - currentalpha <alpha> */
- private int
- zcurrentalpha(register os_ptr op)
- { push(1);
- make_real(op, gs_currentalpha(igs));
- return 0;
- }
-
- /* - currentgray <gray> */
- private int
- zcurrentgray(register os_ptr op)
- { push(1);
- make_real(op, gs_currentgray(igs));
- return 0;
- }
-
- /* - currentrgbcolor <red> <green> <blue> */
- private int
- zcurrentrgbcolor(register os_ptr op)
- { float par[3];
- gs_currentrgbcolor(igs, par);
- push(3);
- make_reals(op - 2, par, 3);
- return 0;
- }
-
- /* - currenttransfer <proc> */
- private int
- zcurrenttransfer(register os_ptr op)
- { push(1);
- *op = istate->transfer_procs.colored.gray;
- return 0;
- }
-
- /* - processcolors <int> - */
- /* Note: this is an undocumented operator that is not supported */
- /* in Level 2. */
- private int
- zprocesscolors(register os_ptr op)
- { push(1);
- make_int(op, gs_currentdevice(igs)->color_info.num_components);
- return 0;
- }
-
- /* <alpha> setalpha - */
- private int
- zsetalpha(register os_ptr op)
- { float alpha;
- int code;
- if ( real_param(op, &alpha) < 0 )
- return_op_typecheck(op);
- if ( (code = gs_setalpha(igs, alpha)) < 0 )
- return code;
- pop(1);
- return 0;
- }
-
- /* <gray> setgray - */
- private int
- zsetgray(register os_ptr op)
- { float gray;
- int code;
- if ( real_param(op, &gray) < 0 )
- return_op_typecheck(op);
- if ( (code = gs_setgray(igs, gray)) < 0 )
- return code;
- make_null(&istate->colorspace.array);
- pop(1);
- return 0;
- }
-
- /* <red> <green> <blue> setrgbcolor - */
- private int
- zsetrgbcolor(register os_ptr op)
- { float par[3];
- int code;
- if ( (code = num_params(op, 3, par)) < 0 ||
- (code = gs_setrgbcolor(igs, par[0], par[1], par[2])) < 0
- )
- return code;
- make_null(&istate->colorspace.array);
- pop(3);
- return 0;
- }
-
- /* <proc> settransfer - */
- private int
- zsettransfer(register os_ptr op)
- { int code;
- check_proc(*op);
- check_ostack(zcolor_remap_one_ostack - 1);
- check_estack(1 + zcolor_remap_one_estack);
- istate->transfer_procs.colored.red =
- istate->transfer_procs.colored.green =
- istate->transfer_procs.colored.blue =
- istate->transfer_procs.colored.gray = *op;
- code = gs_settransfer_remap(igs, gs_mapped_transfer, false);
- if ( code < 0 ) return code;
- push_op_estack(zcolor_reset_transfer);
- pop(1); op--;
- return zcolor_remap_one(&istate->transfer_procs.colored.gray, op,
- igs->set_transfer.colored.gray, igs,
- zcolor_remap_one_finish);
- }
-
- /* ------ Internal routines ------ */
-
- /* Prepare to remap one color component */
- /* (also used for black generation and undercolor removal). */
- /* Use the 'for' operator to gather the values. */
- /* The caller must have done the necessary check_ostack and check_estack. */
- int
- zcolor_remap_one(const ref *pproc, register os_ptr op, gx_transfer_map *pmap,
- const gs_state *pgs, int (*finish_proc)(P1(os_ptr)))
- { osp = op += 4;
- make_int(op - 3, 0);
- make_int(op - 2, 1);
- make_int(op - 1, transfer_map_size - 1);
- *op = *pproc;
- ++esp;
- make_struct(esp, imemory_space((gs_ref_memory_t *)pgs->memory),
- pmap);
- push_op_estack(finish_proc);
- push_op_estack(zfor_fraction);
- return o_push_estack;
- }
-
- /* Store the result of remapping a component. */
- private int
- zcolor_remap_one_store(os_ptr op, floatp min_value)
- { int i;
- gx_transfer_map *pmap = r_ptr(esp, gx_transfer_map);
- if ( ref_stack_count(&o_stack) < transfer_map_size )
- return_error(e_stackunderflow);
- for ( i = 0; i < transfer_map_size; i++ )
- { float v;
- int code =
- real_param(ref_stack_index(&o_stack,
- transfer_map_size - 1 - i),
- &v);
- if ( code < 0 ) return code;
- pmap->values[i] =
- (v < min_value ? float2frac(min_value) :
- v >= 1.0 ? frac_1 :
- float2frac(v));
- }
- ref_stack_pop(&o_stack, transfer_map_size);
- esp--; /* pop pointer to transfer map */
- return o_pop_estack;
- }
- int
- zcolor_remap_one_finish(os_ptr op)
- { return zcolor_remap_one_store(op, 0.0);
- }
- int
- zcolor_remap_one_signed_finish(os_ptr op)
- { return zcolor_remap_one_store(op, -1.0);
- }
-
- /* Finally, reset the effective transfer functions and */
- /* invalidate the current color. */
- int
- zcolor_reset_transfer(os_ptr op)
- { gx_set_effective_transfer(igs);
- return zcolor_remap_color(op);
- }
- int
- zcolor_remap_color(os_ptr op)
- { gx_unset_dev_color(igs);
- return 0;
- }
-
- /* ------ Initialization procedure ------ */
-
- BEGIN_OP_DEFS(zcolor_op_defs) {
- {"0currentalpha", zcurrentalpha},
- {"0currentgray", zcurrentgray},
- {"0currentrgbcolor", zcurrentrgbcolor},
- {"0currenttransfer", zcurrenttransfer},
- {"0processcolors", zprocesscolors},
- {"1setalpha", zsetalpha},
- {"1setgray", zsetgray},
- {"3setrgbcolor", zsetrgbcolor},
- {"1settransfer", zsettransfer},
- /* Internal operators */
- {"1%zcolor_remap_one_finish", zcolor_remap_one_finish},
- {"1%zcolor_remap_one_signed_finish", zcolor_remap_one_signed_finish},
- {"0%zcolor_reset_transfer", zcolor_reset_transfer},
- {"0%zcolor_remap_color", zcolor_remap_color},
- END_OP_DEFS(0) }
-