git.oblomov.eu Git - wine/blob - dlls/gdiplus/graphicspath.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
  20 #include <stdarg.h>
  21 #include <math.h>
  22
  23 #include "windef.h"
  24 #include "winbase.h"
  25 #include "winuser.h"
  26 #include "wingdi.h"
  27 #include "gdiplus.h"
  28 #include "gdiplus_private.h"
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
  32
  33 /* make sure path has enough space for len more points */
  34 static BOOL lengthen_path(GpPath *path, INT len)
  35 {
  36     /* initial allocation */
  37     if(path->datalen == 0){
  38         path->datalen = len * 2;
  39
  40         path->pathdata.Points = GdipAlloc(path->datalen * sizeof(PointF));
  41         if(!path->pathdata.Points)   return FALSE;
  42
  43         path->pathdata.Types = GdipAlloc(path->datalen);
  44         if(!path->pathdata.Types){
  45             GdipFree(path->pathdata.Points);
  46             return FALSE;
  47         }
  48     }
  49     /* reallocation, double size of arrays */
  50     else if(path->datalen - path->pathdata.Count < len){
  51         while(path->datalen - path->pathdata.Count < len)
  52             path->datalen *= 2;
  53
  54         path->pathdata.Points = HeapReAlloc(GetProcessHeap(), 0,
  55             path->pathdata.Points, path->datalen * sizeof(PointF));
  56         if(!path->pathdata.Points)  return FALSE;
  57
  58         path->pathdata.Types = HeapReAlloc(GetProcessHeap(), 0,
  59             path->pathdata.Types, path->datalen);
  60         if(!path->pathdata.Types)   return FALSE;
  61     }
  62
  63     return TRUE;
  64 }
  65
  66 GpStatus WINGDIPAPI GdipAddPathArc(GpPath *path, REAL x1, REAL y1, REAL x2,
  67     REAL y2, REAL startAngle, REAL sweepAngle)
  68 {
  69     INT count, old_count, i;
  70
  71     if(!path)
  72         return InvalidParameter;
  73
  74     count = arc2polybezier(NULL, x1, y1, x2, y2, startAngle, sweepAngle);
  75
  76     if(count == 0)
  77         return Ok;
  78     if(!lengthen_path(path, count))
  79         return OutOfMemory;
  80
  81     old_count = path->pathdata.Count;
  82     arc2polybezier(&path->pathdata.Points[old_count], x1, y1, x2, y2,
  83                    startAngle, sweepAngle);
  84
  85     for(i = 0; i < count; i++){
  86         path->pathdata.Types[old_count + i] = PathPointTypeBezier;
  87     }
  88
  89     path->pathdata.Types[old_count] =
  90         (path->newfigure ? PathPointTypeStart : PathPointTypeLine);
  91     path->newfigure = FALSE;
  92     path->pathdata.Count += count;
  93
  94     return Ok;
  95 }
  96
  97 GpStatus WINGDIPAPI GdipAddPathLine2(GpPath *path, GDIPCONST GpPointF *points,
  98     INT count)
  99 {
 100     INT i, old_count;
 101
 102     if(!path || !points)
 103         return InvalidParameter;
 104
 105     if(!lengthen_path(path, count))
 106         return OutOfMemory;
 107
 108     old_count = path->pathdata.Count;
 109
 110     for(i = 0; i < count; i++){
 111         path->pathdata.Points[old_count + i].X = points[i].X;
 112         path->pathdata.Points[old_count + i].Y = points[i].Y;
 113         path->pathdata.Types[old_count + i] = PathPointTypeLine;
 114     }
 115
 116     if(path->newfigure){
 117         path->pathdata.Types[old_count] = PathPointTypeStart;
 118         path->newfigure = FALSE;
 119     }
 120
 121     path->pathdata.Count += count;
 122
 123     return Ok;
 124 }
 125
 126 GpStatus WINGDIPAPI GdipAddPathPath(GpPath *path, GDIPCONST GpPath* addingPath,
 127     BOOL connect)
 128 {
 129     INT old_count, count;
 130
 131     if(!path || !addingPath)
 132         return InvalidParameter;
 133
 134     old_count = path->pathdata.Count;
 135     count = addingPath->pathdata.Count;
 136
 137     if(!lengthen_path(path, count))
 138         return OutOfMemory;
 139
 140     memcpy(&path->pathdata.Points[old_count], addingPath->pathdata.Points,
 141            count * sizeof(GpPointF));
 142     memcpy(&path->pathdata.Types[old_count], addingPath->pathdata.Types, count);
 143
 144     if(path->newfigure || !connect)
 145         path->pathdata.Types[old_count] = PathPointTypeStart;
 146     else
 147         path->pathdata.Types[old_count] = PathPointTypeLine;
 148
 149     path->newfigure = FALSE;
 150     path->pathdata.Count += count;
 151
 152     return Ok;
 153 }
 154
 155 GpStatus WINGDIPAPI GdipClosePathFigure(GpPath* path)
 156 {
 157     if(!path)
 158         return InvalidParameter;
 159
 160     if(path->pathdata.Count > 0){
 161         path->pathdata.Types[path->pathdata.Count - 1] |= PathPointTypeCloseSubpath;
 162         path->newfigure = TRUE;
 163     }
 164
 165     return Ok;
 166 }
 167
 168 GpStatus WINGDIPAPI GdipClosePathFigures(GpPath* path)
 169 {
 170     INT i;
 171
 172     if(!path)
 173         return InvalidParameter;
 174
 175     for(i = 1; i < path->pathdata.Count; i++){
 176         if(path->pathdata.Types[i] == PathPointTypeStart)
 177             path->pathdata.Types[i-1] |= PathPointTypeCloseSubpath;
 178     }
 179
 180     path->newfigure = TRUE;
 181
 182     return Ok;
 183 }
 184
 185 GpStatus WINGDIPAPI GdipCreatePath(GpFillMode fill, GpPath **path)
 186 {
 187     if(!path)
 188         return InvalidParameter;
 189
 190     *path = GdipAlloc(sizeof(GpPath));
 191     if(!*path)  return OutOfMemory;
 192
 193     (*path)->fill = fill;
 194     (*path)->newfigure = TRUE;
 195
 196     return Ok;
 197 }
 198
 199 GpStatus WINGDIPAPI GdipDeletePath(GpPath *path)
 200 {
 201     if(!path)
 202         return InvalidParameter;
 203
 204     GdipFree(path->pathdata.Points);
 205     GdipFree(path->pathdata.Types);
 206     GdipFree(path);
 207
 208     return Ok;
 209 }
 210
 211 GpStatus WINGDIPAPI GdipGetPathFillMode(GpPath *path, GpFillMode *fillmode)
 212 {
 213     if(!path || !fillmode)
 214         return InvalidParameter;
 215
 216     *fillmode = path->fill;
 217
 218     return Ok;
 219 }
 220
 221 GpStatus WINGDIPAPI GdipGetPathPoints(GpPath *path, GpPointF* points, INT count)
 222 {
 223     if(!path)
 224         return InvalidParameter;
 225
 226     if(count < path->pathdata.Count)
 227         return InsufficientBuffer;
 228
 229     memcpy(points, path->pathdata.Points, path->pathdata.Count * sizeof(GpPointF));
 230
 231     return Ok;
 232 }
 233
 234 GpStatus WINGDIPAPI GdipGetPathTypes(GpPath *path, BYTE* types, INT count)
 235 {
 236     if(!path)
 237         return InvalidParameter;
 238
 239     if(count < path->pathdata.Count)
 240         return InsufficientBuffer;
 241
 242     memcpy(types, path->pathdata.Types, path->pathdata.Count);
 243
 244     return Ok;
 245 }
 246
 247 /* Windows expands the bounding box to the maximum possible bounding box
 248  * for a given pen.  For example, if a line join can extend past the point
 249  * it's joining by x units, the bounding box is extended by x units in every
 250  * direction (even though this is too conservative for most cases). */
 251 GpStatus WINGDIPAPI GdipGetPathWorldBounds(GpPath* path, GpRectF* bounds,
 252     GDIPCONST GpMatrix *matrix, GDIPCONST GpPen *pen)
 253 {
 254     GpPointF * points, temp_pts[4];
 255     INT count, i;
 256     REAL path_width = 1.0, width, height, temp, low_x, low_y, high_x, high_y;
 257
 258     /* Matrix and pen can be null. */
 259     if(!path || !bounds)
 260         return InvalidParameter;
 261
 262     /* If path is empty just return. */
 263     count = path->pathdata.Count;
 264     if(count == 0){
 265         bounds->X = bounds->Y = bounds->Width = bounds->Height = 0.0;
 266         return Ok;
 267     }
 268
 269     points = path->pathdata.Points;
 270
 271     low_x = high_x = points[0].X;
 272     low_y = high_y = points[0].Y;
 273
 274     for(i = 1; i < count; i++){
 275         low_x = min(low_x, points[i].X);
 276         low_y = min(low_y, points[i].Y);
 277         high_x = max(high_x, points[i].X);
 278         high_y = max(high_y, points[i].Y);
 279     }
 280
 281     width = high_x - low_x;
 282     height = high_y - low_y;
 283
 284     /* This looks unusual but it's the only way I can imitate windows. */
 285     if(matrix){
 286         temp_pts[0].X = low_x;
 287         temp_pts[0].Y = low_y;
 288         temp_pts[1].X = low_x;
 289         temp_pts[1].Y = high_y;
 290         temp_pts[2].X = high_x;
 291         temp_pts[2].Y = high_y;
 292         temp_pts[3].X = high_x;
 293         temp_pts[3].Y = low_y;
 294
 295         GdipTransformMatrixPoints((GpMatrix*)matrix, temp_pts, 4);
 296         low_x = temp_pts[0].X;
 297         low_y = temp_pts[0].Y;
 298
 299         for(i = 1; i < 4; i++){
 300             low_x = min(low_x, temp_pts[i].X);
 301             low_y = min(low_y, temp_pts[i].Y);
 302         }
 303
 304         temp = width;
 305         width = height * fabs(matrix->matrix[2]) + width * fabs(matrix->matrix[0]);
 306         height = height * fabs(matrix->matrix[3]) + temp * fabs(matrix->matrix[1]);
 307     }
 308
 309     if(pen){
 310         path_width = pen->width / 2.0;
 311
 312         if(count > 2)
 313             path_width = max(path_width,  pen->width * pen->miterlimit / 2.0);
 314         /* FIXME: this should probably also check for the startcap */
 315         if(pen->endcap & LineCapNoAnchor)
 316             path_width = max(path_width,  pen->width * 2.2);
 317
 318         low_x -= path_width;
 319         low_y -= path_width;
 320         width += 2.0 * path_width;
 321         height += 2.0 * path_width;
 322     }
 323
 324     bounds->X = low_x;
 325     bounds->Y = low_y;
 326     bounds->Width = width;
 327     bounds->Height = height;
 328
 329     return Ok;
 330 }
 331
 332 GpStatus WINGDIPAPI GdipGetPointCount(GpPath *path, INT *count)
 333 {
 334     if(!path)
 335         return InvalidParameter;
 336
 337     *count = path->pathdata.Count;
 338
 339     return Ok;
 340 }
 341
 342 GpStatus WINGDIPAPI GdipStartPathFigure(GpPath *path)
 343 {
 344     if(!path)
 345         return InvalidParameter;
 346
 347     path->newfigure = TRUE;
 348
 349     return Ok;
 350 }
 351
 352 GpStatus WINGDIPAPI GdipResetPath(GpPath *path)
 353 {
 354     if(!path)
 355         return InvalidParameter;
 356
 357     path->pathdata.Count = 0;
 358     path->newfigure = TRUE;
 359     path->fill = FillModeAlternate;
 360
 361     return Ok;
 362 }
 363
 364 GpStatus WINGDIPAPI GdipTransformPath(GpPath *path, GpMatrix *matrix)
 365 {
 366     if(!path)
 367         return InvalidParameter;
 368
 369     if(path->pathdata.Count == 0)
 370         return Ok;
 371
 372     return GdipTransformMatrixPoints(matrix, (GpPointF*) path->pathdata.Points,
 373                                      path->pathdata.Count);
 374 }