dlls/gdiplus/matrix.c

   1 /*
   2  * Copyright (C) 2007 Google (Evan Stade)
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <stdarg.h>
  20 #include <math.h>
  21
  22 #include "windef.h"
  23 #include "winbase.h"
  24 #include "wingdi.h"
  25
  26 #include "gdiplus.h"
  27 #include "gdiplus_private.h"
  28
  29 /* Multiplies two matrices of the form
  30  *
  31  * idx:0 idx:1     0
  32  * idx:2 idx:3     0
  33  * idx:4 idx:5     1
  34  *
  35  * and puts the output in out.
  36  * */
  37 static void matrix_multiply(GDIPCONST REAL * left, GDIPCONST REAL * right, REAL * out)
  38 {
  39     REAL temp[6];
  40     int i, odd;
  41
  42     for(i = 0; i < 6; i++){
  43         odd = i % 2;
  44         temp[i] = left[i - odd] * right[odd] + left[i - odd + 1] * right[odd + 2] +
  45                   (i >= 4 ? right[odd + 4] : 0.0);
  46     }
  47
  48     memcpy(out, temp, 6 * sizeof(REAL));
  49 }
  50
  51 GpStatus WINGDIPAPI GdipCreateMatrix2(REAL m11, REAL m12, REAL m21, REAL m22,
  52     REAL dx, REAL dy, GpMatrix **matrix)
  53 {
  54     if(!matrix)
  55         return InvalidParameter;
  56
  57     *matrix = GdipAlloc(sizeof(GpMatrix));
  58     if(!*matrix)    return OutOfMemory;
  59
  60     /* first row */
  61     (*matrix)->matrix[0] = m11;
  62     (*matrix)->matrix[1] = m12;
  63     /* second row */
  64     (*matrix)->matrix[2] = m21;
  65     (*matrix)->matrix[3] = m22;
  66     /* third row */
  67     (*matrix)->matrix[4] = dx;
  68     (*matrix)->matrix[5] = dy;
  69
  70     return Ok;
  71 }
  72
  73 GpStatus WINGDIPAPI GdipCreateMatrix(GpMatrix **matrix)
  74 {
  75     if(!matrix)
  76         return InvalidParameter;
  77
  78     *matrix = GdipAlloc(sizeof(GpMatrix));
  79     if(!*matrix)    return OutOfMemory;
  80
  81     (*matrix)->matrix[0] = 1.0;
  82     (*matrix)->matrix[1] = 0.0;
  83     (*matrix)->matrix[2] = 0.0;
  84     (*matrix)->matrix[3] = 1.0;
  85     (*matrix)->matrix[4] = 0.0;
  86     (*matrix)->matrix[5] = 0.0;
  87
  88     return Ok;
  89 }
  90
  91 GpStatus WINGDIPAPI GdipDeleteMatrix(GpMatrix *matrix)
  92 {
  93     if(!matrix)
  94         return InvalidParameter;
  95
  96     GdipFree(matrix);
  97
  98     return Ok;
  99 }
 100
 101 GpStatus WINGDIPAPI GdipMultiplyMatrix(GpMatrix *matrix, GpMatrix* matrix2,
 102     GpMatrixOrder order)
 103 {
 104     if(!matrix || !matrix2)
 105         return InvalidParameter;
 106
 107     if(order == MatrixOrderAppend)
 108         matrix_multiply(matrix->matrix, matrix2->matrix, matrix->matrix);
 109     else
 110         matrix_multiply(matrix2->matrix, matrix->matrix, matrix->matrix);
 111
 112     return Ok;
 113 }
 114
 115 GpStatus WINGDIPAPI GdipRotateMatrix(GpMatrix *matrix, REAL angle,
 116     GpMatrixOrder order)
 117 {
 118     REAL cos_theta, sin_theta, rotate[6];
 119
 120     if(!matrix)
 121         return InvalidParameter;
 122
 123     angle = deg2rad(angle);
 124     cos_theta = cos(angle);
 125     sin_theta = sin(angle);
 126
 127     rotate[0] = cos_theta;
 128     rotate[1] = sin_theta;
 129     rotate[2] = -sin_theta;
 130     rotate[3] = cos_theta;
 131     rotate[4] = 0.0;
 132     rotate[5] = 0.0;
 133
 134     if(order == MatrixOrderAppend)
 135         matrix_multiply(matrix->matrix, rotate, matrix->matrix);
 136     else
 137         matrix_multiply(rotate, matrix->matrix, matrix->matrix);
 138
 139     return Ok;
 140 }
 141
 142 GpStatus WINGDIPAPI GdipScaleMatrix(GpMatrix *matrix, REAL scaleX, REAL scaleY,
 143     GpMatrixOrder order)
 144 {
 145     REAL scale[6];
 146
 147     if(!matrix)
 148         return InvalidParameter;
 149
 150     scale[0] = scaleX;
 151     scale[1] = 0.0;
 152     scale[2] = 0.0;
 153     scale[3] = scaleY;
 154     scale[4] = 0.0;
 155     scale[5] = 0.0;
 156
 157     if(order == MatrixOrderAppend)
 158         matrix_multiply(matrix->matrix, scale, matrix->matrix);
 159     else
 160         matrix_multiply(scale, matrix->matrix, matrix->matrix);
 161
 162     return Ok;
 163 }
 164
 165 GpStatus WINGDIPAPI GdipTransformMatrixPoints(GpMatrix *matrix, GpPointF *pts,
 166                                               INT count)
 167 {
 168     REAL x, y;
 169     INT i;
 170
 171     if(!matrix || !pts)
 172         return InvalidParameter;
 173
 174     for(i = 0; i < count; i++)
 175     {
 176         x = pts[i].X;
 177         y = pts[i].Y;
 178
 179         pts[i].X = x * matrix->matrix[0] + y * matrix->matrix[2] + matrix->matrix[4];
 180         pts[i].Y = x * matrix->matrix[1] + y * matrix->matrix[3] + matrix->matrix[5];
 181     }
 182
 183     return Ok;
 184 }
 185
 186 GpStatus WINGDIPAPI GdipTranslateMatrix(GpMatrix *matrix, REAL offsetX,
 187     REAL offsetY, GpMatrixOrder order)
 188 {
 189     REAL translate[6];
 190
 191     if(!matrix)
 192         return InvalidParameter;
 193
 194     translate[0] = 1.0;
 195     translate[1] = 0.0;
 196     translate[2] = 0.0;
 197     translate[3] = 1.0;
 198     translate[4] = offsetX;
 199     translate[5] = offsetY;
 200
 201     if(order == MatrixOrderAppend)
 202         matrix_multiply(matrix->matrix, translate, matrix->matrix);
 203     else
 204         matrix_multiply(translate, matrix->matrix, matrix->matrix);
 205
 206     return Ok;
 207 }