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