Sweden-Number/dlls/gdiplus/matrix.c

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/*
* Copyright (C) 2007 Google (Evan Stade)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "gdiplus.h"
#include "gdiplus_private.h"
GpStatus WINGDIPAPI GdipCreateMatrix2(REAL m11, REAL m12, REAL m21, REAL m22,
REAL dx, REAL dy, GpMatrix **matrix)
{
if(!matrix)
return InvalidParameter;
*matrix = GdipAlloc(sizeof(GpMatrix));
if(!*matrix) return OutOfMemory;
/* first row */
(*matrix)->matrix[0] = m11;
(*matrix)->matrix[1] = m12;
/* second row */
(*matrix)->matrix[2] = m21;
(*matrix)->matrix[3] = m22;
/* third row */
(*matrix)->matrix[4] = dx;
(*matrix)->matrix[5] = dy;
return Ok;
}
GpStatus WINGDIPAPI GdipDeleteMatrix(GpMatrix *matrix)
{
if(!matrix)
return InvalidParameter;
GdipFree(matrix);
return Ok;
}
GpStatus WINGDIPAPI GdipTransformMatrixPoints(GpMatrix *matrix, GpPointF *pts,
INT count)
{
REAL x, y;
INT i;
if(!matrix || !pts)
return InvalidParameter;
for(i = 0; i < count; i++)
{
x = pts[i].X;
y = pts[i].Y;
pts[i].X = x * matrix->matrix[0] + y * matrix->matrix[2] + matrix->matrix[4];
pts[i].Y = x * matrix->matrix[1] + y * matrix->matrix[3] + matrix->matrix[5];
}
return Ok;
}