/* Copyright (C) 2001-2018 Artifex Software, Inc.
   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied,
   modified or distributed except as expressly authorized under the terms
   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
   CA 94945, U.S.A., +1(415)492-9861, for further information.
*/


/* Definition of matrices and client interface to matrix routines */

#ifndef gsmatrix_INCLUDED
#  define gsmatrix_INCLUDED

/* See p. 65 of the PostScript manual for the semantics of */
/* transformation matrices. */

/* if you make any additions/changes to the gs_matrix_s structure or the
   _matrix_body macro you need to make the appropriate additions/changes 
   to the gs_matrix_compare() function in gsmatrix.c */
/* Structure for a transformation matrix. */
#define _matrix_body\
  float xx, xy, yx, yy, tx, ty
struct gs_matrix_s {
    _matrix_body;
};
struct gs_matrix_double_s {
  double xx, xy, yx, yy, tx, ty;
};

#ifndef gs_matrix_DEFINED
#  define gs_matrix_DEFINED
typedef struct gs_matrix_s gs_matrix;
#endif
#ifndef gs_matrix_double_DEFINED
#  define gs_matrix_double_DEFINED
typedef struct gs_matrix_double_s gs_matrix_double;
#endif

/* Macro for initializing constant matrices */
#define constant_matrix_body(xx, xy, yx, yy, tx, ty)\
  (float)(xx), (float)(xy), (float)(yx),\
  (float)(yy), (float)(tx), (float)(ty)

/* Macros for testing whether matrix coefficients are zero, */
/* for shortcuts when the matrix is simple. */
#define is_xxyy(pmat) is_fzero2((pmat)->xy, (pmat)->yx)
#define is_xyyx(pmat) is_fzero2((pmat)->xx, (pmat)->yy)

/* 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(gs_matrix *);
int gs_make_translation(double, double, gs_matrix *),
    gs_make_scaling(double, double, gs_matrix *),
    gs_make_rotation(double, gs_matrix *);

/* Matrix arithmetic */
int gs_matrix_multiply(const gs_matrix *, const gs_matrix *, gs_matrix *),
    gs_matrix_multiply_double(const gs_matrix_double *, const gs_matrix *, gs_matrix_double *),
    gs_matrix_invert(const gs_matrix *, gs_matrix *),
    gs_matrix_invert_to_double(const gs_matrix *, gs_matrix_double *),
    gs_matrix_translate(const gs_matrix *, double, double, gs_matrix *),
    gs_matrix_scale(const gs_matrix *, double, double, gs_matrix *),
    gs_matrix_rotate(const gs_matrix *, double, gs_matrix *);

/* Matrix comparison */
int gs_matrix_compare(const gs_matrix *, const gs_matrix *);

/* Coordinate transformation */
int gs_point_transform(double, double, const gs_matrix *, gs_point *),
    gs_point_transform_inverse(double, double, const gs_matrix *, gs_point *),
    gs_distance_transform(double, double, const gs_matrix *, gs_point *),
    gs_distance_transform_inverse(double, double, const gs_matrix *, gs_point *),
    gs_points_bbox(const gs_point[4], gs_rect *),
    gs_bbox_transform_only(const gs_rect *, const gs_matrix *, gs_point[4]),
    gs_bbox_transform(const gs_rect *, const gs_matrix *, gs_rect *),
    gs_bbox_transform_inverse(const gs_rect *, const gs_matrix *, gs_rect *);

/* Serialization */
#ifndef stream_DEFINED
#  define stream_DEFINED
typedef struct stream_s stream;
#endif
int sget_matrix(stream *, gs_matrix *);
int sput_matrix(stream *, const gs_matrix *);

#endif /* gsmatrix_INCLUDED */
