1/*
2 * fontconfig/src/fcmatrix.c
3 *
4 * Copyright © 2000 Tuomas J. Lukka
5 *
6 * Permission to use, copy, modify, distribute, and sell this software and its
7 * documentation for any purpose is hereby granted without fee, provided that
8 * the above copyright notice appear in all copies and that both that
9 * copyright notice and this permission notice appear in supporting
10 * documentation, and that the name of Tuomas Lukka not be used in
11 * advertising or publicity pertaining to distribution of the software without
12 * specific, written prior permission.  Tuomas Lukka makes no
13 * representations about the suitability of this software for any purpose.  It
14 * is provided "as is" without express or implied warranty.
15 *
16 * TUOMAS LUKKA DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
17 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
18 * EVENT SHALL TUOMAS LUKKA BE LIABLE FOR ANY SPECIAL, INDIRECT OR
19 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
20 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
21 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
22 * PERFORMANCE OF THIS SOFTWARE.
23 */
24
25#include "fcint.h"
26#include <math.h>
27#include <stdlib.h>
28#include <ctype.h>
29
30const FcMatrix    FcIdentityMatrix = { 1, 0, 0, 1 };
31
32FcMatrix *
33FcMatrixCopy (const FcMatrix *mat)
34{
35    FcMatrix *r;
36    if(!mat)
37	return 0;
38    r = (FcMatrix *) malloc (sizeof (*r) );
39    if (!r)
40	return 0;
41    *r = *mat;
42    return r;
43}
44
45void
46FcMatrixFree (FcMatrix *mat)
47{
48    if (mat != &FcIdentityMatrix)
49	free (mat);
50}
51
52FcBool
53FcMatrixEqual (const FcMatrix *mat1, const FcMatrix *mat2)
54{
55    if(mat1 == mat2) return FcTrue;
56    if(mat1 == 0 || mat2 == 0) return FcFalse;
57    return mat1->xx == mat2->xx &&
58	   mat1->xy == mat2->xy &&
59	   mat1->yx == mat2->yx &&
60	   mat1->yy == mat2->yy;
61}
62
63void
64FcMatrixMultiply (FcMatrix *result, const FcMatrix *a, const FcMatrix *b)
65{
66    FcMatrix	r;
67
68    r.xx = a->xx * b->xx + a->xy * b->yx;
69    r.xy = a->xx * b->xy + a->xy * b->yy;
70    r.yx = a->yx * b->xx + a->yy * b->yx;
71    r.yy = a->yx * b->xy + a->yy * b->yy;
72    *result = r;
73}
74
75void
76FcMatrixRotate (FcMatrix *m, double c, double s)
77{
78    FcMatrix	r;
79
80    /*
81     * X Coordinate system is upside down, swap to make
82     * rotations counterclockwise
83     */
84    r.xx = c;
85    r.xy = -s;
86    r.yx = s;
87    r.yy = c;
88    FcMatrixMultiply (m, &r, m);
89}
90
91void
92FcMatrixScale (FcMatrix *m, double sx, double sy)
93{
94    FcMatrix	r;
95
96    r.xx = sx;
97    r.xy = 0;
98    r.yx = 0;
99    r.yy = sy;
100    FcMatrixMultiply (m, &r, m);
101}
102
103void
104FcMatrixShear (FcMatrix *m, double sh, double sv)
105{
106    FcMatrix	r;
107
108    r.xx = 1;
109    r.xy = sh;
110    r.yx = sv;
111    r.yy = 1;
112    FcMatrixMultiply (m, &r, m);
113}
114#define __fcmatrix__
115#include "fcaliastail.h"
116#undef __fcmatrix__
117