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1 | /* | |
2 | * $RCSId: $ | |
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 <math.h> | |
26 | #include <stdlib.h> | |
27 | #include <ctype.h> | |
28 | #include "fcint.h" | |
29 | ||
30 | const FcMatrix FcIdentityMatrix = { 1, 0, 0, 1 }; | |
31 | ||
32 | FcMatrix * | |
33 | FcMatrixCopy (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 | FcMemAlloc (FC_MEM_MATRIX, sizeof (FcMatrix)); | |
42 | *r = *mat; | |
43 | return r; | |
44 | } | |
45 | ||
46 | void | |
47 | FcMatrixFree (FcMatrix *mat) | |
48 | { | |
49 | if (mat != &FcIdentityMatrix) | |
50 | { | |
51 | FcMemFree (FC_MEM_MATRIX, sizeof (FcMatrix)); | |
52 | free (mat); | |
53 | } | |
54 | } | |
55 | ||
56 | FcBool | |
57 | FcMatrixEqual (const FcMatrix *mat1, const FcMatrix *mat2) | |
58 | { | |
59 | if(mat1 == mat2) return FcTrue; | |
60 | if(mat1 == 0 || mat2 == 0) return FcFalse; | |
61 | return mat1->xx == mat2->xx && | |
62 | mat1->xy == mat2->xy && | |
63 | mat1->yx == mat2->yx && | |
64 | mat1->yy == mat2->yy; | |
65 | } | |
66 | ||
67 | void | |
68 | FcMatrixMultiply (FcMatrix *result, const FcMatrix *a, const FcMatrix *b) | |
69 | { | |
70 | FcMatrix r; | |
71 | ||
72 | r.xx = a->xx * b->xx + a->xy * b->yx; | |
73 | r.xy = a->xx * b->xy + a->xy * b->yy; | |
74 | r.yx = a->yx * b->xx + a->yy * b->yx; | |
75 | r.yy = a->yx * b->xy + a->yy * b->yy; | |
76 | *result = r; | |
77 | } | |
78 | ||
79 | void | |
80 | FcMatrixRotate (FcMatrix *m, double c, double s) | |
81 | { | |
82 | FcMatrix r; | |
83 | ||
84 | /* | |
85 | * X Coordinate system is upside down, swap to make | |
86 | * rotations counterclockwise | |
87 | */ | |
88 | r.xx = c; | |
89 | r.xy = -s; | |
90 | r.yx = s; | |
91 | r.yy = c; | |
92 | FcMatrixMultiply (m, &r, m); | |
93 | } | |
94 | ||
95 | void | |
96 | FcMatrixScale (FcMatrix *m, double sx, double sy) | |
97 | { | |
98 | FcMatrix r; | |
99 | ||
100 | r.xx = sx; | |
101 | r.xy = 0; | |
102 | r.yx = 0; | |
103 | r.yy = sy; | |
104 | FcMatrixMultiply (m, &r, m); | |
105 | } | |
106 | ||
107 | void | |
108 | FcMatrixShear (FcMatrix *m, double sh, double sv) | |
109 | { | |
110 | FcMatrix r; | |
111 | ||
112 | r.xx = 1; | |
113 | r.xy = sh; | |
114 | r.yx = sv; | |
115 | r.yy = 1; | |
116 | FcMatrixMultiply (m, &r, m); | |
117 | } |