home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 1989, 1991, 1993 Aladdin Enterprises. All rights reserved.
-
- This file is part of Ghostscript.
-
- Ghostscript is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- to anyone for the consequences of using it or for whether it serves any
- particular purpose or works at all, unless he says so in writing. Refer
- to the Ghostscript General Public License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- Ghostscript, but only under the conditions described in the Ghostscript
- General Public License. A copy of this license is supposed to have been
- given to you along with Ghostscript so you can know your rights and
- responsibilities. It should be in a file named COPYING. Among other
- things, the copyright notice and this notice must be preserved on all
- copies. */
-
- /* zmatrix.c */
- /* Matrix operators for Ghostscript */
- #include "ghost.h"
- #include "errors.h"
- #include "oper.h"
- #include "gsmatrix.h"
- #include "state.h"
- #include "gscoord.h"
- #include "store.h"
-
- /* Forward references */
- private int near common_transform(P3(os_ptr,
- int (*)(P4(gs_state *, floatp, floatp, gs_point *)),
- int (*)(P4(floatp, floatp, const gs_matrix *, gs_point *))));
-
- /* Initialize the type and attributes of the identity matrix. */
- /* We may have to do this after each save and restore, */
- /* in order to get the l_new attribute correct. */
- void
- init_identity_matrix(void)
- { extern gs_matrix gs_identity_matrix;
- ref *mp = (ref *)&gs_identity_matrix;
- int attrs = alloc_save_new_mask;
- int i;
- for ( i = 0; i < 6; i++, mp++ )
- r_set_type_attrs(mp, t_real, attrs);
- }
-
- /* <matrix> currentmatrix <matrix> */
- int
- zcurrentmatrix(register os_ptr op)
- { int code = write_matrix(op);
- if ( code < 0 )
- return code;
- gs_currentmatrix(igs, (gs_matrix *)(op->value.refs));
- return 0;
- }
-
- /* <matrix> setmatrix - */
- int
- zsetmatrix(register os_ptr op)
- { gs_matrix mat;
- int code = read_matrix(op, &mat);
- if ( code < 0 )
- return code;
- if ( (code = gs_setmatrix(igs, &mat)) < 0 )
- return code;
- pop(1);
- return 0;
- }
-
- /* <tx> <ty> translate - */
- /* <tx> <ty> <matrix> translate <matrix> */
- int
- ztranslate(register os_ptr op)
- { int code = write_matrix(op);
- float trans[2];
- if ( code < 0 ) /* no matrix operand */
- { if ( (code = num_params(op, 2, trans)) < 0 )
- return code;
- code = gs_translate(igs, trans[0], trans[1]);
- }
- else /* matrix operand */
- { gs_matrix *pmat = (gs_matrix *)op->value.refs;
- if ( (code = num_params(op - 1, 2, trans)) < 0 )
- return code;
- code = gs_make_translation(trans[0], trans[1], pmat);
- op[-2] = *op;
- }
- if ( code >= 0 ) pop(2);
- return code;
- }
-
- /* <sx> <sy> scale - */
- /* <sx> <sy> <matrix> scale <matrix> */
- int
- zscale(register os_ptr op)
- { float scale[2];
- int code = write_matrix(op);
- if ( code < 0 ) /* no matrix operand */
- { if ( (code = num_params(op, 2, scale)) < 0 )
- return code;
- code = gs_scale(igs, scale[0], scale[1]);
- }
- else /* matrix operand */
- { gs_matrix *pmat = (gs_matrix *)op->value.refs;
- if ( (code = num_params(op - 1, 2, scale)) < 0 )
- return code;
- code = gs_make_scaling(scale[0], scale[1], pmat);
- op[-2] = *op;
- }
- if ( code >= 0 ) pop(2);
- return code;
- }
-
- /* <angle> rotate - */
- /* <angle> <matrix> rotate <matrix> */
- int
- zrotate(register os_ptr op)
- { int code = write_matrix(op);
- float ang;
- if ( code < 0 ) /* no matrix operand */
- { if ( (code = num_params(op, 1, &ang)) < 0 ) return code;
- code = gs_rotate(igs, ang);
- }
- else /* matrix operand */
- { gs_matrix *pmat = (gs_matrix *)op->value.refs;
- if ( (code = num_params(op - 1, 1, &ang)) < 0 ) return code;
- code = gs_make_rotation(ang, pmat);
- op[-1] = *op;
- }
- if ( code >= 0 ) pop(1);
- return code;
- }
-
- /* <matrix> concat - */
- int
- zconcat(register os_ptr op)
- { gs_matrix mat;
- int code = read_matrix(op, &mat);
- if ( code < 0 ) return code;
- code = gs_concat(igs, &mat);
- if ( code < 0 ) return code;
- pop(1);
- return 0;
- }
-
- /* <matrix1> <matrix2> <matrix> concatmatrix <matrix> */
- int
- zconcatmatrix(register os_ptr op)
- { gs_matrix m1, m2;
- int code;
- if ( (code = read_matrix(op - 2, &m1)) < 0 ||
- (code = read_matrix(op - 1, &m2)) < 0 ||
- (code = write_matrix(op)) < 0 ||
- (code = gs_matrix_multiply(&m1, &m2, (gs_matrix *)(op->value.refs))) < 0
- ) return code;
- op[-2] = *op;
- pop(2);
- return code;
- }
-
- /* <x> <y> transform <xt> <yt> */
- /* <x> <y> <matrix> transform <xt> <yt> */
- int
- ztransform(register os_ptr op)
- { return common_transform(op, gs_transform, gs_point_transform);
- }
-
- /* <dx> <dy> dtransform <dxt> <dyt> */
- /* <dx> <dy> <matrix> dtransform <dxt> <dyt> */
- int
- zdtransform(register os_ptr op)
- { return common_transform(op, gs_dtransform, gs_distance_transform);
- }
-
- /* <xt> <yt> itransform <x> <y> */
- /* <xt> <yt> <matrix> itransform <x> <y> */
- int
- zitransform(register os_ptr op)
- { return common_transform(op, gs_itransform, gs_point_transform_inverse);
- }
-
- /* <dxt> <dyt> idtransform <dx> <dy> */
- /* <dxt> <dyt> <matrix> idtransform <dx> <dy> */
- int
- zidtransform(register os_ptr op)
- { return common_transform(op, gs_idtransform, gs_distance_transform_inverse);
- }
-
- /* Common logic for [i][d]transform */
- private int near
- common_transform(register os_ptr op,
- int (*ptproc)(P4(gs_state *, floatp, floatp, gs_point *)),
- int (*matproc)(P4(floatp, floatp, const gs_matrix *, gs_point *)))
- { float opxy[2];
- gs_point pt;
- int code;
- /* Optimize for the non-matrix case */
- switch ( r_type(op) )
- {
- case t_real:
- opxy[1] = op->value.realval;
- break;
- case t_integer:
- opxy[1] = op->value.intval;
- break;
- case t_array: /* might be a matrix */
- { gs_matrix mat;
- gs_matrix *pmat = &mat;
- if ( (code = read_matrix(op, pmat)) < 0 ||
- (code = num_params(op - 1, 2, opxy)) < 0 ||
- (code = (*matproc)(opxy[0], opxy[1], pmat, &pt)) < 0
- ) return code;
- op--;
- pop(1);
- goto out;
- }
- default:
- return_error(e_typecheck);
- }
- switch ( r_type(op - 1) )
- {
- case t_real:
- opxy[0] = (op - 1)->value.realval;
- break;
- case t_integer:
- opxy[0] = (op - 1)->value.intval;
- break;
- default:
- return_error(e_typecheck);
- }
- if ( (code = (*ptproc)(igs, opxy[0], opxy[1], &pt)) < 0 )
- return code;
- out: make_real(op - 1, pt.x);
- make_real(op, pt.y);
- return 0;
- }
-
- /* <matrix> <inv_matrix> invertmatrix <inv_matrix> */
- int
- zinvertmatrix(register os_ptr op)
- { gs_matrix m;
- int code;
- if ( (code = read_matrix(op - 1, &m)) < 0 ||
- (code = write_matrix(op)) < 0 ||
- (code = gs_matrix_invert(&m, (gs_matrix *)op->value.refs)) < 0
- ) return code;
- op[-1] = *op;
- pop(1);
- return code;
- }
-
- /* ------ Initialization procedure ------ */
-
- op_def zmatrix_op_defs[] = {
- {"1concat", zconcat},
- {"2dtransform", zdtransform},
- {"3concatmatrix", zconcatmatrix},
- {"1currentmatrix", zcurrentmatrix},
- {"2idtransform", zidtransform},
- {"2invertmatrix", zinvertmatrix},
- {"2itransform", zitransform},
- {"1rotate", zrotate},
- {"2scale", zscale},
- {"1setmatrix", zsetmatrix},
- {"2transform", ztransform},
- {"2translate", ztranslate},
- op_def_end(init_identity_matrix)
- };
-