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- /* Copyright (C) 1989, 1990, 1991 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. */
-
- /* gsmatrix.h */
- /* Definition of matrices and matrix routines for Ghostscript library */
-
- #ifndef gsmatrix_INCLUDED
- # define gsmatrix_INCLUDED
-
- /* See p. 65 of the PostScript manual for the semantics of */
- /* transformation matrices. */
-
- /* Structure for a transformation matrix. */
- /* This is a machine-dependent hack to avoid importing */
- /* the full definition of a Ghostscript type-tagged reference. */
- #define _matrix_body\
- long _xx /*skip*/; float xx;\
- long _xy /*skip*/; float xy;\
- long _yx /*skip*/; float yx;\
- long _yy /*skip*/; float yy;\
- long _tx /*skip*/; float tx;\
- long _ty /*skip*/; float ty
- struct gs_matrix_s {
- _matrix_body;
- };
- #ifndef gs_matrix_DEFINED
- # define gs_matrix_DEFINED
- typedef struct gs_matrix_s gs_matrix;
- #endif
- /* Macro for initializing constant matrices */
- #define constant_matrix_body(xx, xy, yx, yy, tx, ty)\
- 0L,(float)(xx), 0L,(float)(xy), 0L,(float)(yx),\
- 0L,(float)(yy), 0L,(float)(tx), 0L,(float)(ty)
-
- /* The identity matrix (for structure initialization) */
- #define identity_matrix_body\
- constant_matrix_body(1, 0, 0, 1, 0, 0)
-
- /* Matrix creation */
- void gs_make_identity(P1(gs_matrix *));
- int gs_make_translation(P3(floatp, floatp, gs_matrix *)),
- gs_make_scaling(P3(floatp, floatp, gs_matrix *)),
- gs_make_rotation(P2(floatp, gs_matrix *));
-
- /* Matrix arithmetic */
- int gs_matrix_multiply(P3(const gs_matrix *, const gs_matrix *, gs_matrix *)),
- gs_matrix_invert(P2(const gs_matrix *, gs_matrix *)),
- gs_matrix_rotate(P3(const gs_matrix *, floatp, gs_matrix *));
-
- /* Coordinate transformation */
- int gs_point_transform(P4(floatp, floatp, const gs_matrix *, gs_point *)),
- gs_point_transform_inverse(P4(floatp, floatp, const gs_matrix *, gs_point *)),
- gs_distance_transform(P4(floatp, floatp, const gs_matrix *, gs_point *)),
- gs_distance_transform_inverse(P4(floatp, floatp, const gs_matrix *, gs_point *)),
- gs_bbox_transform(P3(gs_rect *, const gs_matrix *, gs_rect *)),
- gs_bbox_transform_inverse(P3(gs_rect *, const gs_matrix *, gs_rect *));
-
- #endif /* gsmatrix_INCLUDED */
-