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 "objbase.h"
  27
  28 #include "gdiplus.h"
  29 #include "gdiplus_private.h"
  30
  31 /* Multiplies two matrices of the form
  32  *
  33  * idx:0 idx:1     0
  34  * idx:2 idx:3     0
  35  * idx:4 idx:5     1
  36  *
  37  * and puts the output in out.
  38  * */
  39 static void matrix_multiply(GDIPCONST REAL * left, GDIPCONST REAL * right, REAL * out)
  40 {
  41     REAL temp[6];
  42     int i, odd;
  43
  44     for(i = 0; i < 6; i++){
  45         odd = i % 2;
  46         temp[i] = left[i - odd] * right[odd] + left[i - odd + 1] * right[odd + 2] +
  47                   (i >= 4 ? right[odd + 4] : 0.0);
  48     }
  49
  50     memcpy(out, temp, 6 * sizeof(REAL));
  51 }
  52
  53 GpStatus WINGDIPAPI GdipCreateMatrix2(REAL m11, REAL m12, REAL m21, REAL m22,
  54     REAL dx, REAL dy, GpMatrix **matrix)
  55 {
  56     if(!matrix)
  57         return InvalidParameter;
  58
  59     *matrix = GdipAlloc(sizeof(GpMatrix));
  60     if(!*matrix)    return OutOfMemory;
  61
  62     /* first row */
  63     (*matrix)->matrix[0] = m11;
  64     (*matrix)->matrix[1] = m12;
  65     /* second row */
  66     (*matrix)->matrix[2] = m21;
  67     (*matrix)->matrix[3] = m22;
  68     /* third row */
  69     (*matrix)->matrix[4] = dx;
  70     (*matrix)->matrix[5] = dy;
  71
  72     return Ok;
  73 }
  74
  75 GpStatus WINGDIPAPI GdipCreateMatrix3(GDIPCONST GpRectF *rect,
  76     GDIPCONST GpPointF *pt, GpMatrix **matrix)
  77 {
  78     if(!matrix)
  79         return InvalidParameter;
  80
  81     *matrix = GdipAlloc(sizeof(GpMatrix));
  82     if(!*matrix)    return OutOfMemory;
  83
  84     memcpy((*matrix)->matrix, rect, 4 * sizeof(REAL));
  85
  86     (*matrix)->matrix[4] = pt->X;
  87     (*matrix)->matrix[5] = pt->Y;
  88
  89     return Ok;
  90 }
  91
  92 GpStatus WINGDIPAPI GdipCreateMatrix3I(GDIPCONST GpRect *rect, GDIPCONST GpPoint *pt,
  93     GpMatrix **matrix)
  94 {
  95     GpRectF rectF;
  96     GpPointF ptF;
  97
  98     rectF.X = (REAL)rect->X;
  99     rectF.Y = (REAL)rect->Y;
 100     rectF.Width = (REAL)rect->Width;
 101     rectF.Height = (REAL)rect->Height;
 102
 103     ptF.X = (REAL)pt->X;
 104     ptF.Y = (REAL)pt->Y;
 105
 106     return GdipCreateMatrix3(&rectF, &ptF, matrix);
 107 }
 108
 109 GpStatus WINGDIPAPI GdipCloneMatrix(GpMatrix *matrix, GpMatrix **clone)
 110 {
 111     if(!matrix || !clone)
 112         return InvalidParameter;
 113
 114     *clone = GdipAlloc(sizeof(GpMatrix));
 115     if(!*clone)    return OutOfMemory;
 116
 117     **clone = *matrix;
 118
 119     return Ok;
 120 }
 121
 122 GpStatus WINGDIPAPI GdipCreateMatrix(GpMatrix **matrix)
 123 {
 124     if(!matrix)
 125         return InvalidParameter;
 126
 127     *matrix = GdipAlloc(sizeof(GpMatrix));
 128     if(!*matrix)    return OutOfMemory;
 129
 130     (*matrix)->matrix[0] = 1.0;
 131     (*matrix)->matrix[1] = 0.0;
 132     (*matrix)->matrix[2] = 0.0;
 133     (*matrix)->matrix[3] = 1.0;
 134     (*matrix)->matrix[4] = 0.0;
 135     (*matrix)->matrix[5] = 0.0;
 136
 137     return Ok;
 138 }
 139
 140 GpStatus WINGDIPAPI GdipDeleteMatrix(GpMatrix *matrix)
 141 {
 142     if(!matrix)
 143         return InvalidParameter;
 144
 145     GdipFree(matrix);
 146
 147     return Ok;
 148 }
 149
 150 GpStatus WINGDIPAPI GdipGetMatrixElements(GDIPCONST GpMatrix *matrix,
 151     REAL *out)
 152 {
 153     if(!matrix || !out)
 154         return InvalidParameter;
 155
 156     memcpy(out, matrix->matrix, sizeof(matrix->matrix));
 157
 158     return Ok;
 159 }
 160
 161 GpStatus WINGDIPAPI GdipMultiplyMatrix(GpMatrix *matrix, GpMatrix* matrix2,
 162     GpMatrixOrder order)
 163 {
 164     if(!matrix || !matrix2)
 165         return InvalidParameter;
 166
 167     if(order == MatrixOrderAppend)
 168         matrix_multiply(matrix->matrix, matrix2->matrix, matrix->matrix);
 169     else
 170         matrix_multiply(matrix2->matrix, matrix->matrix, matrix->matrix);
 171
 172     return Ok;
 173 }
 174
 175 GpStatus WINGDIPAPI GdipRotateMatrix(GpMatrix *matrix, REAL angle,
 176     GpMatrixOrder order)
 177 {
 178     REAL cos_theta, sin_theta, rotate[6];
 179
 180     if(!matrix)
 181         return InvalidParameter;
 182
 183     angle = deg2rad(angle);
 184     cos_theta = cos(angle);
 185     sin_theta = sin(angle);
 186
 187     rotate[0] = cos_theta;
 188     rotate[1] = sin_theta;
 189     rotate[2] = -sin_theta;
 190     rotate[3] = cos_theta;
 191     rotate[4] = 0.0;
 192     rotate[5] = 0.0;
 193
 194     if(order == MatrixOrderAppend)
 195         matrix_multiply(matrix->matrix, rotate, matrix->matrix);
 196     else
 197         matrix_multiply(rotate, matrix->matrix, matrix->matrix);
 198
 199     return Ok;
 200 }
 201
 202 GpStatus WINGDIPAPI GdipScaleMatrix(GpMatrix *matrix, REAL scaleX, REAL scaleY,
 203     GpMatrixOrder order)
 204 {
 205     REAL scale[6];
 206
 207     if(!matrix)
 208         return InvalidParameter;
 209
 210     scale[0] = scaleX;
 211     scale[1] = 0.0;
 212     scale[2] = 0.0;
 213     scale[3] = scaleY;
 214     scale[4] = 0.0;
 215     scale[5] = 0.0;
 216
 217     if(order == MatrixOrderAppend)
 218         matrix_multiply(matrix->matrix, scale, matrix->matrix);
 219     else
 220         matrix_multiply(scale, matrix->matrix, matrix->matrix);
 221
 222     return Ok;
 223 }
 224
 225 GpStatus WINGDIPAPI GdipSetMatrixElements(GpMatrix *matrix, REAL m11, REAL m12,
 226     REAL m21, REAL m22, REAL dx, REAL dy)
 227 {
 228     if(!matrix)
 229         return InvalidParameter;
 230
 231     matrix->matrix[0] = m11;
 232     matrix->matrix[1] = m12;
 233     matrix->matrix[2] = m21;
 234     matrix->matrix[3] = m22;
 235     matrix->matrix[4] = dx;
 236     matrix->matrix[5] = dy;
 237
 238     return Ok;
 239 }
 240
 241 GpStatus WINGDIPAPI GdipTransformMatrixPoints(GpMatrix *matrix, GpPointF *pts,
 242                                               INT count)
 243 {
 244     REAL x, y;
 245     INT i;
 246
 247     if(!matrix || !pts || count <= 0)
 248         return InvalidParameter;
 249
 250     for(i = 0; i < count; i++)
 251     {
 252         x = pts[i].X;
 253         y = pts[i].Y;
 254
 255         pts[i].X = x * matrix->matrix[0] + y * matrix->matrix[2] + matrix->matrix[4];
 256         pts[i].Y = x * matrix->matrix[1] + y * matrix->matrix[3] + matrix->matrix[5];
 257     }
 258
 259     return Ok;
 260 }
 261
 262 GpStatus WINGDIPAPI GdipTransformMatrixPointsI(GpMatrix *matrix, GpPoint *pts, INT count)
 263 {
 264     GpPointF *ptsF;
 265     GpStatus ret;
 266     INT i;
 267
 268     if(count <= 0)
 269         return InvalidParameter;
 270
 271     ptsF = GdipAlloc(sizeof(GpPointF) * count);
 272     if(!ptsF)
 273         return OutOfMemory;
 274
 275     for(i = 0; i < count; i++){
 276         ptsF[i].X = (REAL)pts[i].X;
 277         ptsF[i].Y = (REAL)pts[i].Y;
 278     }
 279
 280     ret = GdipTransformMatrixPoints(matrix, ptsF, count);
 281
 282     if(ret == Ok)
 283         for(i = 0; i < count; i++){
 284             pts[i].X = roundr(ptsF[i].X);
 285             pts[i].Y = roundr(ptsF[i].Y);
 286         }
 287     GdipFree(ptsF);
 288
 289     return ret;
 290 }
 291
 292 GpStatus WINGDIPAPI GdipTranslateMatrix(GpMatrix *matrix, REAL offsetX,
 293     REAL offsetY, GpMatrixOrder order)
 294 {
 295     REAL translate[6];
 296
 297     if(!matrix)
 298         return InvalidParameter;
 299
 300     translate[0] = 1.0;
 301     translate[1] = 0.0;
 302     translate[2] = 0.0;
 303     translate[3] = 1.0;
 304     translate[4] = offsetX;
 305     translate[5] = offsetY;
 306
 307     if(order == MatrixOrderAppend)
 308         matrix_multiply(matrix->matrix, translate, matrix->matrix);
 309     else
 310         matrix_multiply(translate, matrix->matrix, matrix->matrix);
 311
 312     return Ok;
 313 }
 314
 315 GpStatus WINGDIPAPI GdipVectorTransformMatrixPoints(GpMatrix *matrix, GpPointF *pts, INT count)
 316 {
 317     REAL x, y;
 318     INT i;
 319
 320     if(!matrix || !pts || count <= 0)
 321         return InvalidParameter;
 322
 323     for(i = 0; i < count; i++)
 324     {
 325         x = pts[i].X;
 326         y = pts[i].Y;
 327
 328         pts[i].X = x * matrix->matrix[0] + y * matrix->matrix[2];
 329         pts[i].Y = x * matrix->matrix[1] + y * matrix->matrix[3];
 330     }
 331
 332     return Ok;
 333 }
 334
 335 GpStatus WINGDIPAPI GdipVectorTransformMatrixPointsI(GpMatrix *matrix, GpPoint *pts, INT count)
 336 {
 337     GpPointF *ptsF;
 338     GpStatus ret;
 339     INT i;
 340
 341     if(count <= 0)
 342         return InvalidParameter;
 343
 344     ptsF = GdipAlloc(sizeof(GpPointF) * count);
 345     if(!ptsF)
 346         return OutOfMemory;
 347
 348     for(i = 0; i < count; i++){
 349         ptsF[i].X = (REAL)pts[i].X;
 350         ptsF[i].Y = (REAL)pts[i].Y;
 351     }
 352
 353     ret = GdipVectorTransformMatrixPoints(matrix, ptsF, count);
 354     /* store back */
 355     if(ret == Ok)
 356         for(i = 0; i < count; i++){
 357             pts[i].X = roundr(ptsF[i].X);
 358             pts[i].Y = roundr(ptsF[i].Y);
 359         }
 360     GdipFree(ptsF);
 361
 362     return ret;
 363 }
 364
 365 GpStatus WINGDIPAPI GdipIsMatrixEqual(GDIPCONST GpMatrix *matrix, GDIPCONST GpMatrix *matrix2,
 366     BOOL *result)
 367 {
 368     if(!matrix || !matrix2 || !result)
 369         return InvalidParameter;
 370     /* based on single array member of GpMatrix */
 371     *result = (memcmp(matrix->matrix, matrix2->matrix, sizeof(GpMatrix)) == 0);
 372
 373     return Ok;
 374 }
 375
 376 GpStatus WINGDIPAPI GdipIsMatrixIdentity(GDIPCONST GpMatrix *matrix, BOOL *result)
 377 {
 378     GpMatrix *e;
 379     GpStatus ret;
 380     BOOL isIdentity;
 381
 382     if(!matrix || !result)
 383         return InvalidParameter;
 384
 385     ret = GdipCreateMatrix(&e);
 386     if(ret != Ok) return ret;
 387
 388     ret = GdipIsMatrixEqual(matrix, e, &isIdentity);
 389     if(ret == Ok)
 390         *result = isIdentity;
 391
 392     GdipFree(e);
 393
 394     return ret;
 395 }