118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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* $RCSId: $
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*
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* Copyright © 2000 Tuomas J. Lukka
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Tuomas Lukka not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Tuomas Lukka makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* TUOMAS LUKKA DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL TUOMAS LUKKA BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <math.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "fcint.h"
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const FcMatrix FcIdentityMatrix = { 1, 0, 0, 1 };
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FcMatrix *
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FcMatrixCopy (const FcMatrix *mat)
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{
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FcMatrix *r;
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if(!mat)
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return 0;
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r = (FcMatrix *) malloc (sizeof (*r) );
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if (!r)
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return 0;
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FcMemAlloc (FC_MEM_MATRIX, sizeof (FcMatrix));
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*r = *mat;
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return r;
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}
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void
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FcMatrixFree (FcMatrix *mat)
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{
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if (mat != &FcIdentityMatrix)
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{
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FcMemFree (FC_MEM_MATRIX, sizeof (FcMatrix));
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free (mat);
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}
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}
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FcBool
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FcMatrixEqual (const FcMatrix *mat1, const FcMatrix *mat2)
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{
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if(mat1 == mat2) return FcTrue;
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if(mat1 == 0 || mat2 == 0) return FcFalse;
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return mat1->xx == mat2->xx &&
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mat1->xy == mat2->xy &&
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mat1->yx == mat2->yx &&
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mat1->yy == mat2->yy;
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}
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void
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FcMatrixMultiply (FcMatrix *result, const FcMatrix *a, const FcMatrix *b)
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{
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FcMatrix r;
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r.xx = a->xx * b->xx + a->xy * b->yx;
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r.xy = a->xx * b->xy + a->xy * b->yy;
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r.yx = a->yx * b->xx + a->yy * b->yx;
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r.yy = a->yx * b->xy + a->yy * b->yy;
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*result = r;
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}
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void
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FcMatrixRotate (FcMatrix *m, double c, double s)
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{
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FcMatrix r;
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/*
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* X Coordinate system is upside down, swap to make
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* rotations counterclockwise
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*/
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r.xx = c;
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r.xy = -s;
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r.yx = s;
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r.yy = c;
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FcMatrixMultiply (m, &r, m);
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}
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void
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FcMatrixScale (FcMatrix *m, double sx, double sy)
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{
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FcMatrix r;
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r.xx = sx;
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r.xy = 0;
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r.yx = 0;
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r.yy = sy;
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FcMatrixMultiply (m, &r, m);
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}
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void
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FcMatrixShear (FcMatrix *m, double sh, double sv)
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{
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FcMatrix r;
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r.xx = 1;
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r.xy = sh;
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r.yx = sv;
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r.yy = 1;
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FcMatrixMultiply (m, &r, m);
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}
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