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- /* Copyright (C) 1989, 1990 Aladdin Enterprises. All rights reserved.
- Distributed by Free Software Foundation, Inc.
-
- 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. */
-
- /* gscoord.c */
- /* Coordinate system operators for Ghostscript library */
- #include "math_.h"
- #include "gx.h"
- #include "gserrors.h"
- #include "gxfixed.h"
- #include "gxmatrix.h"
- #include "gzstate.h"
- #include "gzdevice.h" /* requires gsstate */
- #include "gscoord.h" /* requires gsmatrix, gsstate */
-
- /* Forward declarations */
- #ifdef DEBUG
- private void trace_ctm(P1(gs_state *));
- private void trace_matrix(P1(gs_matrix *));
- #endif
-
- /* Macro for ensuring ctm_inverse is valid */
- #ifdef DEBUG
- #define print_inverse(pgs)\
- if ( gs_debug['x'] )\
- dprintf("[x]Inverting:\n"), trace_ctm(pgs), trace_matrix(&pgs->ctm_inverse)
- #else
- #define print_inverse(pgs) 0
- #endif
- #define ensure_inverse_valid(pgs)\
- if ( !pgs->inverse_valid )\
- { int code = gs_matrix_invert(&ctm_only(pgs), &pgs->ctm_inverse);\
- print_inverse(pgs);\
- if ( code < 0 ) return code;\
- pgs->inverse_valid = 1;\
- }
-
- /* Macro for updating fixed version of ctm */
- #define update_ctm(pgs)\
- update_matrix_fixed(pgs->ctm),\
- pgs->inverse_valid = 0,\
- pgs->char_tm_valid = 0
-
- /* ------ Coordinate system definition ------ */
-
- int
- gs_initmatrix(gs_state *pgs)
- { gx_device *dev = pgs->device->info;
- (*dev->procs->get_initial_matrix)(dev, &ctm_only(pgs));
- update_ctm(pgs);
- #ifdef DEBUG
- if ( gs_debug['x'] )
- dprintf("[x]initmatrix:\n"), trace_ctm(pgs);
- #endif
- return 0;
- }
-
- int
- gs_defaultmatrix(gs_state *pgs, gs_matrix *pmat)
- { gx_device *dev = pgs->device->info;
- (*dev->procs->get_initial_matrix)(dev, pmat);
- return 0;
- }
-
- int
- gs_currentmatrix(gs_state *pgs, gs_matrix *pmat)
- { *pmat = ctm_only(pgs);
- return 0;
- }
-
- int
- gs_setmatrix(gs_state *pgs, gs_matrix *pmat)
- { ctm_only(pgs) = *pmat;
- update_ctm(pgs);
- #ifdef DEBUG
- if ( gs_debug['x'] )
- dprintf("[x]setmatrix:\n"), trace_ctm(pgs);
- #endif
- return 0;
- }
-
- int
- gs_translate(gs_state *pgs, floatp dx, floatp dy)
- { gs_point pt;
- int code;
- if ( (code = gs_distance_transform(dx, dy, &ctm_only(pgs), &pt)) < 0 )
- return code;
- pgs->ctm.tx += pt.x;
- pgs->ctm.ty += pt.y;
- update_ctm(pgs);
- #ifdef DEBUG
- if ( gs_debug['x'] )
- dprintf4("[x]translate: %f %f -> %f %f\n",
- dx, dy, pt.x, pt.y),
- trace_ctm(pgs);
- #endif
- return 0;
- }
-
- int
- gs_scale(gs_state *pgs, floatp sx, floatp sy)
- { pgs->ctm.xx *= sx;
- pgs->ctm.xy *= sx;
- pgs->ctm.yx *= sy;
- pgs->ctm.yy *= sy;
- pgs->inverse_valid = 0, pgs->char_tm_valid = 0;
- #ifdef DEBUG
- if ( gs_debug['x'] )
- dprintf2("[x]scale: %f %f\n", sx, sy), trace_ctm(pgs);
- #endif
- return 0;
- }
-
- int
- gs_rotate(gs_state *pgs, floatp ang)
- { int code = gs_matrix_rotate(&ctm_only(pgs), ang, &ctm_only(pgs));
- pgs->inverse_valid = 0, pgs->char_tm_valid = 0;
- #ifdef DEBUG
- if ( gs_debug['x'] )
- dprintf1("[x]rotate: %f\n", ang), trace_ctm(pgs);
- #endif
- return code;
- }
-
- int
- gs_concat(gs_state *pgs, gs_matrix *pmat)
- { int code = gs_matrix_multiply(pmat, &ctm_only(pgs), &ctm_only(pgs));
- update_ctm(pgs);
- #ifdef DEBUG
- if ( gs_debug['x'] )
- dprintf("[x]concat:\n"), trace_matrix(pmat), trace_ctm(pgs);
- #endif
- return code;
- }
-
- /* ------ Coordinate transformation ------ */
-
- int
- gs_transform(gs_state *pgs, floatp x, floatp y, gs_point *pt)
- { return gs_point_transform(x, y, &ctm_only(pgs), pt);
- }
-
- int
- gs_dtransform(gs_state *pgs, floatp dx, floatp dy, gs_point *pt)
- { return gs_distance_transform(dx, dy, &ctm_only(pgs), pt);
- }
-
- int
- gs_itransform(gs_state *pgs, floatp x, floatp y, gs_point *pt)
- { ensure_inverse_valid(pgs);
- return gs_point_transform((float)x, (float)y, &pgs->ctm_inverse, pt);
- }
-
- int
- gs_idtransform(gs_state *pgs, floatp dx, floatp dy, gs_point *pt)
- { ensure_inverse_valid(pgs);
- return gs_distance_transform((float)dx, (float)dy, &pgs->ctm_inverse, pt);
- }
-
- /* ------ For internal use only ------ */
-
- /* Set the translation to a fixed value, */
- /* and mark char_tm as valid. */
- /* Used by gschar.c to prepare for a BuildChar procedure. */
- int
- gs_translate_to_fixed(register gs_state *pgs, fixed px, fixed py)
- { pgs->ctm.tx = fixed2float(pgs->ctm.tx_fixed = px);
- pgs->ctm.ty = fixed2float(pgs->ctm.ty_fixed = py);
- pgs->inverse_valid = 0;
- pgs->char_tm_valid = 1;
- return 0;
- }
-
- /* ------ Debugging printout ------ */
-
- #ifdef DEBUG
-
- /* Print a matrix */
- private void
- trace_ctm(gs_state *pgs)
- { gs_matrix_fixed *pmat = &pgs->ctm;
- trace_matrix((gs_matrix *)pmat);
- dprintf2("\t\tt_fixed: [%6g %6g]\n",
- fixed2float(pmat->tx_fixed), fixed2float(pmat->ty_fixed));
- }
- private void
- trace_matrix(register gs_matrix *pmat)
- { dprintf6("\t[%6g %6g %6g %6g %6g %6g]\n",
- pmat->xx, pmat->xy, pmat->yx, pmat->yy, pmat->tx, pmat->ty);
- }
-
- #endif
-