dlls/gdiplus/region.c

   1 /*
   2  * Copyright (C) 2008 Google (Lei Zhang)
   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
  21 #include "windef.h"
  22 #include "winbase.h"
  23 #include "wingdi.h"
  24
  25 #include "objbase.h"
  26
  27 #include "gdiplus.h"
  28 #include "gdiplus_private.h"
  29 #include "wine/debug.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(gdiplus);
  32
  33 /**********************************************************
  34  *
  35  * Data returned by GdipGetRegionData looks something like this:
  36  *
  37  * struct region_data_header
  38  * {
  39  *   DWORD size;     size in bytes of the data - 8.
  40  *   DWORD magic1;   probably a checksum.
  41  *   DWORD magic2;   always seems to be 0xdbc01001 - version?
  42  *   DWORD num_ops;  number of combining ops * 2
  43  * };
  44  *
  45  * Then follows a sequence of combining ops and region elements.
  46  *
  47  * A region element is either a RECTF or some path data.
  48  *
  49  * Combining ops are just stored as their CombineMode value.
  50  *
  51  * Each RECTF is preceded by the DWORD 0x10000000.  An empty rect is
  52  * stored as 0x10000002 (with no following RECTF) and an infinite rect
  53  * is stored as 0x10000003 (again with no following RECTF).
  54  *
  55  * Path data is preceded by the DWORD 0x10000001.  Then follows a
  56  * DWORD size and then size bytes of data.
  57  *
  58  * The combining ops are stored in the reverse order to the region
  59  * elements and in the reverse order to which the region was
  60  * constructed.
  61  *
  62  * When two or more complex regions (ie those with more than one
  63  * element) are combined, the combining op for the two regions comes
  64  * first, then the combining ops for the region elements in region 1,
  65  * followed by the region elements for region 1, then follows the
  66  * combining ops for region 2 and finally region 2's region elements.
  67  * Presumably you're supposed to use the 0x1000000x header to find the
  68  * end of the op list (the count of the elements in each region is not
  69  * stored).
  70  *
  71  * When a simple region (1 element) is combined, it's treated as if a
  72  * single rect/path is being combined.
  73  *
  74  */
  75
  76 #define FLAGS_NOFLAGS   0x0
  77 #define FLAGS_INTPATH   0x4000
  78
  79 /* Header size as far as header->size is concerned. This doesn't include
  80  * header->size or header->checksum
  81  */
  82 static const INT sizeheader_size = sizeof(DWORD) * 2;
  83
  84 typedef struct packed_point
  85 {
  86     short X;
  87     short Y;
  88 } packed_point;
  89
  90 /* Everything is measured in DWORDS; round up if there's a remainder */
  91 static inline INT get_pathtypes_size(const GpPath* path)
  92 {
  93     INT needed = path->pathdata.Count / sizeof(DWORD);
  94
  95     if (path->pathdata.Count % sizeof(DWORD) > 0)
  96         needed++;
  97
  98     return needed * sizeof(DWORD);
  99 }
 100
 101 static inline INT get_element_size(const region_element* element)
 102 {
 103     INT needed = sizeof(DWORD); /* DWORD for the type */
 104     switch(element->type)
 105     {
 106         case RegionDataRect:
 107             return needed + sizeof(GpRect);
 108         case RegionDataPath:
 109              needed += element->elementdata.pathdata.pathheader.size;
 110              needed += sizeof(DWORD); /* Extra DWORD for pathheader.size */
 111              return needed;
 112         case RegionDataEmptyRect:
 113         case RegionDataInfiniteRect:
 114             return needed;
 115         default:
 116             needed += get_element_size(element->elementdata.combine.left);
 117             needed += get_element_size(element->elementdata.combine.right);
 118             return needed;
 119     }
 120
 121     return 0;
 122 }
 123
 124 /* Does not check parameters, caller must do that */
 125 static inline GpStatus init_region(GpRegion* region, const RegionType type)
 126 {
 127     region->node.type       = type;
 128     region->header.checksum = 0xdeadbeef;
 129     region->header.magic    = VERSION_MAGIC;
 130     region->header.num_children  = 0;
 131     region->header.size     = sizeheader_size + get_element_size(&region->node);
 132
 133     return Ok;
 134 }
 135
 136 static inline GpStatus clone_element(const region_element* element,
 137         region_element** element2)
 138 {
 139     GpStatus stat;
 140
 141     /* root node is allocated with GpRegion */
 142     if(!*element2){
 143         *element2 = GdipAlloc(sizeof(region_element));
 144         if (!*element2)
 145             return OutOfMemory;
 146     }
 147
 148     (*element2)->type = element->type;
 149
 150     switch (element->type)
 151     {
 152         case RegionDataRect:
 153             (*element2)->elementdata.rect = element->elementdata.rect;
 154             break;
 155         case RegionDataEmptyRect:
 156         case RegionDataInfiniteRect:
 157             break;
 158         case RegionDataPath:
 159             (*element2)->elementdata.pathdata.pathheader = element->elementdata.pathdata.pathheader;
 160             stat = GdipClonePath(element->elementdata.pathdata.path,
 161                     &(*element2)->elementdata.pathdata.path);
 162             if (stat != Ok) goto clone_out;
 163             break;
 164         default:
 165             (*element2)->elementdata.combine.left  = NULL;
 166             (*element2)->elementdata.combine.right = NULL;
 167
 168             stat = clone_element(element->elementdata.combine.left,
 169                     &(*element2)->elementdata.combine.left);
 170             if (stat != Ok) goto clone_out;
 171             stat = clone_element(element->elementdata.combine.right,
 172                     &(*element2)->elementdata.combine.right);
 173             if (stat != Ok) goto clone_out;
 174             break;
 175     }
 176
 177     return Ok;
 178
 179 clone_out:
 180     delete_element(*element2);
 181     *element2 = NULL;
 182     return stat;
 183 }
 184
 185 /* Common code for CombineRegion*
 186  * All the caller has to do is get its format into an element
 187  */
 188 static inline void fuse_region(GpRegion* region, region_element* left,
 189         region_element* right, const CombineMode mode)
 190 {
 191     region->node.type = mode;
 192     region->node.elementdata.combine.left = left;
 193     region->node.elementdata.combine.right = right;
 194
 195     region->header.size = sizeheader_size + get_element_size(&region->node);
 196     region->header.num_children += 2;
 197 }
 198
 199 /*****************************************************************************
 200  * GdipCloneRegion [GDIPLUS.@]
 201  *
 202  * Creates a deep copy of the region
 203  *
 204  * PARAMS
 205  *  region  [I] source region
 206  *  clone   [O] resulting clone
 207  *
 208  * RETURNS
 209  *  SUCCESS: Ok
 210  *  FAILURE: InvalidParameter or OutOfMemory
 211  */
 212 GpStatus WINGDIPAPI GdipCloneRegion(GpRegion *region, GpRegion **clone)
 213 {
 214     region_element *element;
 215
 216     TRACE("%p %p\n", region, clone);
 217
 218     if (!(region && clone))
 219         return InvalidParameter;
 220
 221     *clone = GdipAlloc(sizeof(GpRegion));
 222     if (!*clone)
 223         return OutOfMemory;
 224     element = &(*clone)->node;
 225
 226     (*clone)->header = region->header;
 227     return clone_element(&region->node, &element);
 228 }
 229
 230 GpStatus WINGDIPAPI GdipCombineRegionPath(GpRegion *region, GpPath *path, CombineMode mode)
 231 {
 232     GpRegion *path_region;
 233     region_element *left, *right = NULL;
 234     GpStatus stat;
 235
 236     TRACE("%p %p %d\n", region, path, mode);
 237
 238     if (!(region && path))
 239         return InvalidParameter;
 240
 241     stat = GdipCreateRegionPath(path, &path_region);
 242     if (stat != Ok)
 243         return stat;
 244
 245     left = GdipAlloc(sizeof(region_element));
 246     if (!left)
 247         goto out;
 248     *left = region->node;
 249
 250     stat = clone_element(&path_region->node, &right);
 251     if (stat != Ok)
 252         goto out;
 253
 254     fuse_region(region, left, right, mode);
 255
 256     GdipDeleteRegion(path_region);
 257     return Ok;
 258
 259 out:
 260     GdipFree(left);
 261     delete_element(right);
 262     GdipDeleteRegion(path_region);
 263     return stat;
 264 }
 265
 266 GpStatus WINGDIPAPI GdipCombineRegionRect(GpRegion *region,
 267         GDIPCONST GpRectF *rect, CombineMode mode)
 268 {
 269     GpRegion *rect_region;
 270     region_element *left, *right = NULL;
 271     GpStatus stat;
 272
 273     TRACE("%p %p %d\n", region, rect, mode);
 274
 275     if (!(region && rect))
 276         return InvalidParameter;
 277
 278     stat = GdipCreateRegionRect(rect, &rect_region);
 279     if (stat != Ok)
 280         return stat;
 281
 282     left = GdipAlloc(sizeof(region_element));
 283     if (!left)
 284         goto out;
 285     memcpy(left, &region->node, sizeof(region_element));
 286
 287     stat = clone_element(&rect_region->node, &right);
 288     if (stat != Ok)
 289         goto out;
 290
 291     fuse_region(region, left, right, mode);
 292
 293     GdipDeleteRegion(rect_region);
 294     return Ok;
 295
 296 out:
 297     GdipFree(left);
 298     delete_element(right);
 299     GdipDeleteRegion(rect_region);
 300     return stat;
 301 }
 302
 303 GpStatus WINGDIPAPI GdipCombineRegionRectI(GpRegion *region,
 304         GDIPCONST GpRect *rect, CombineMode mode)
 305 {
 306     GpRectF rectf;
 307
 308     TRACE("%p %p %d\n", region, rect, mode);
 309
 310     if (!rect)
 311         return InvalidParameter;
 312
 313     rectf.X = (REAL)rect->X;
 314     rectf.Y = (REAL)rect->Y;
 315     rectf.Height = (REAL)rect->Height;
 316     rectf.Width = (REAL)rect->Width;
 317
 318     return GdipCombineRegionRect(region, &rectf, mode);
 319 }
 320
 321 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
 322         GpRegion *region2, CombineMode mode)
 323 {
 324     region_element *left, *right = NULL;
 325     GpStatus stat;
 326
 327     TRACE("%p %p %d\n", region1, region2, mode);
 328
 329     if(!(region1 && region2))
 330         return InvalidParameter;
 331
 332     left  = GdipAlloc(sizeof(region_element));
 333     if (!left)
 334         return OutOfMemory;
 335
 336     *left = region1->node;
 337     stat = clone_element(&region2->node, &right);
 338     if (stat != Ok)
 339     {
 340         GdipFree(left);
 341         delete_element(right);
 342         return OutOfMemory;
 343     }
 344
 345     fuse_region(region1, left, right, mode);
 346     region1->header.num_children += region2->header.num_children;
 347
 348     return Ok;
 349 }
 350
 351 GpStatus WINGDIPAPI GdipCreateRegion(GpRegion **region)
 352 {
 353     TRACE("%p\n", region);
 354
 355     if(!region)
 356         return InvalidParameter;
 357
 358     *region = GdipAlloc(sizeof(GpRegion));
 359     if(!*region)
 360         return OutOfMemory;
 361
 362     return init_region(*region, RegionDataInfiniteRect);
 363 }
 364
 365 /*****************************************************************************
 366  * GdipCreateRegionPath [GDIPLUS.@]
 367  *
 368  * Creates a GpRegion from a GpPath
 369  *
 370  * PARAMS
 371  *  path    [I] path to base the region on
 372  *  region  [O] pointer to the newly allocated region
 373  *
 374  * RETURNS
 375  *  SUCCESS: Ok
 376  *  FAILURE: InvalidParameter
 377  *
 378  * NOTES
 379  *  If a path has no floating point points, its points will be stored as shorts
 380  *  (INTPATH)
 381  *
 382  *  If a path is empty, it is considered to be an INTPATH
 383  */
 384 GpStatus WINGDIPAPI GdipCreateRegionPath(GpPath *path, GpRegion **region)
 385 {
 386     region_element* element;
 387     GpPoint  *pointsi;
 388     GpPointF *pointsf;
 389
 390     GpStatus stat;
 391     DWORD flags = FLAGS_INTPATH;
 392     INT count, i;
 393
 394     TRACE("%p, %p\n", path, region);
 395
 396     if (!(path && region))
 397         return InvalidParameter;
 398
 399     *region = GdipAlloc(sizeof(GpRegion));
 400     if(!*region)
 401         return OutOfMemory;
 402     stat = init_region(*region, RegionDataPath);
 403     if (stat != Ok)
 404     {
 405         GdipDeleteRegion(*region);
 406         return stat;
 407     }
 408     element = &(*region)->node;
 409     count = path->pathdata.Count;
 410
 411     /* Test to see if the path is an Integer path */
 412     if (count)
 413     {
 414         pointsi = GdipAlloc(sizeof(GpPoint) * count);
 415         pointsf = GdipAlloc(sizeof(GpPointF) * count);
 416         if (!(pointsi && pointsf))
 417         {
 418             GdipFree(pointsi);
 419             GdipFree(pointsf);
 420             GdipDeleteRegion(*region);
 421             return OutOfMemory;
 422         }
 423
 424         stat = GdipGetPathPointsI(path, pointsi, count);
 425         if (stat != Ok)
 426         {
 427             GdipDeleteRegion(*region);
 428             return stat;
 429         }
 430         stat = GdipGetPathPoints(path, pointsf, count);
 431         if (stat != Ok)
 432         {
 433             GdipDeleteRegion(*region);
 434             return stat;
 435         }
 436
 437         for (i = 0; i < count; i++)
 438         {
 439             if (!(pointsi[i].X == pointsf[i].X &&
 440                   pointsi[i].Y == pointsf[i].Y ))
 441             {
 442                 flags = FLAGS_NOFLAGS;
 443                 break;
 444             }
 445         }
 446         GdipFree(pointsi);
 447         GdipFree(pointsf);
 448     }
 449
 450     stat = GdipClonePath(path, &element->elementdata.pathdata.path);
 451     if (stat != Ok)
 452     {
 453         GdipDeleteRegion(*region);
 454         return stat;
 455     }
 456
 457     /* 3 for headers, once again size doesn't count itself */
 458     element->elementdata.pathdata.pathheader.size = ((sizeof(DWORD) * 3));
 459     switch(flags)
 460     {
 461         /* Floats, sent out as floats */
 462         case FLAGS_NOFLAGS:
 463             element->elementdata.pathdata.pathheader.size +=
 464                 (sizeof(DWORD) * count * 2);
 465             break;
 466         /* INTs, sent out as packed shorts */
 467         case FLAGS_INTPATH:
 468             element->elementdata.pathdata.pathheader.size +=
 469                 (sizeof(DWORD) * count);
 470             break;
 471         default:
 472             FIXME("Unhandled flags (%08x). Expect wrong results.\n", flags);
 473     }
 474     element->elementdata.pathdata.pathheader.size += get_pathtypes_size(path);
 475     element->elementdata.pathdata.pathheader.magic = VERSION_MAGIC;
 476     element->elementdata.pathdata.pathheader.count = count;
 477     element->elementdata.pathdata.pathheader.flags = flags;
 478     (*region)->header.size = sizeheader_size + get_element_size(element);
 479
 480     return Ok;
 481 }
 482
 483 GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect,
 484         GpRegion **region)
 485 {
 486     GpStatus stat;
 487
 488     TRACE("%p, %p\n", rect, region);
 489
 490     if (!(rect && region))
 491         return InvalidParameter;
 492
 493     *region = GdipAlloc(sizeof(GpRegion));
 494     stat = init_region(*region, RegionDataRect);
 495     if(stat != Ok)
 496     {
 497         GdipDeleteRegion(*region);
 498         return stat;
 499     }
 500
 501     (*region)->node.elementdata.rect.X = rect->X;
 502     (*region)->node.elementdata.rect.Y = rect->Y;
 503     (*region)->node.elementdata.rect.Width = rect->Width;
 504     (*region)->node.elementdata.rect.Height = rect->Height;
 505
 506     return Ok;
 507 }
 508
 509 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
 510         GpRegion **region)
 511 {
 512     GpRectF rectf;
 513
 514     TRACE("%p, %p\n", rect, region);
 515
 516     rectf.X = (REAL)rect->X;
 517     rectf.Y = (REAL)rect->Y;
 518     rectf.Width = (REAL)rect->Width;
 519     rectf.Height = (REAL)rect->Height;
 520
 521     return GdipCreateRegionRect(&rectf, region);
 522 }
 523
 524 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 525 {
 526     FIXME("(%p, %d, %p): stub\n", data, size, region);
 527
 528     *region = NULL;
 529     return NotImplemented;
 530 }
 531
 532 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 533 {
 534     FIXME("(%p, %p): stub\n", hrgn, region);
 535
 536     *region = NULL;
 537     return NotImplemented;
 538 }
 539
 540 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 541 {
 542     TRACE("%p\n", region);
 543
 544     if (!region)
 545         return InvalidParameter;
 546
 547     delete_element(&region->node);
 548     GdipFree(region);
 549
 550     return Ok;
 551 }
 552
 553 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 554 {
 555     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 556
 557     return NotImplemented;
 558 }
 559
 560 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 561 {
 562     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 563
 564     return NotImplemented;
 565 }
 566
 567 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 568 {
 569     location[*offset] = write;
 570     (*offset)++;
 571 }
 572
 573 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 574 {
 575     ((FLOAT*)location)[*offset] = write;
 576     (*offset)++;
 577 }
 578
 579 static inline void write_packed_point(DWORD* location, INT* offset,
 580         const GpPointF* write)
 581 {
 582     packed_point point;
 583
 584     point.X = write->X;
 585     point.Y = write->Y;
 586     memcpy(location + *offset, &point, sizeof(packed_point));
 587     (*offset)++;
 588 }
 589
 590 static inline void write_path_types(DWORD* location, INT* offset,
 591         const GpPath* path)
 592 {
 593     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 594
 595     /* The unwritten parts of the DWORD (if any) must be cleared */
 596     if (path->pathdata.Count % sizeof(DWORD))
 597         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 598                 path->pathdata.Count,
 599                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 600     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 601 }
 602
 603 static void write_element(const region_element* element, DWORD *buffer,
 604         INT* filled)
 605 {
 606     write_dword(buffer, filled, element->type);
 607     switch (element->type)
 608     {
 609         case CombineModeReplace:
 610         case CombineModeIntersect:
 611         case CombineModeUnion:
 612         case CombineModeXor:
 613         case CombineModeExclude:
 614         case CombineModeComplement:
 615             write_element(element->elementdata.combine.left, buffer, filled);
 616             write_element(element->elementdata.combine.right, buffer, filled);
 617             break;
 618         case RegionDataRect:
 619             write_float(buffer, filled, element->elementdata.rect.X);
 620             write_float(buffer, filled, element->elementdata.rect.Y);
 621             write_float(buffer, filled, element->elementdata.rect.Width);
 622             write_float(buffer, filled, element->elementdata.rect.Height);
 623             break;
 624         case RegionDataPath:
 625         {
 626             INT i;
 627             const GpPath* path = element->elementdata.pathdata.path;
 628
 629             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 630                     sizeof(element->elementdata.pathdata.pathheader));
 631             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 632             switch (element->elementdata.pathdata.pathheader.flags)
 633             {
 634                 case FLAGS_NOFLAGS:
 635                     for (i = 0; i < path->pathdata.Count; i++)
 636                     {
 637                         write_float(buffer, filled, path->pathdata.Points[i].X);
 638                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 639                     }
 640                     break;
 641                 case FLAGS_INTPATH:
 642                     for (i = 0; i < path->pathdata.Count; i++)
 643                     {
 644                         write_packed_point(buffer, filled,
 645                                 &path->pathdata.Points[i]);
 646                     }
 647             }
 648             write_path_types(buffer, filled, path);
 649             break;
 650         }
 651         case RegionDataEmptyRect:
 652         case RegionDataInfiniteRect:
 653             break;
 654     }
 655 }
 656
 657 /*****************************************************************************
 658  * GdipGetRegionData [GDIPLUS.@]
 659  *
 660  * Returns the header, followed by combining ops and region elements.
 661  *
 662  * PARAMS
 663  *  region  [I] region to retrieve from
 664  *  buffer  [O] buffer to hold the resulting data
 665  *  size    [I] size of the buffer
 666  *  needed  [O] (optional) how much data was written
 667  *
 668  * RETURNS
 669  *  SUCCESS: Ok
 670  *  FAILURE: InvalidParamter
 671  *
 672  * NOTES
 673  *  The header contains the size, a checksum, a version string, and the number
 674  *  of children. The size does not count itself or the checksum.
 675  *  Version is always something like 0xdbc01001 or 0xdbc01002
 676  *
 677  *  An element is a RECT, or PATH; Combining ops are stored as their
 678  *  CombineMode value. Special regions (infinite, empty) emit just their
 679  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 680  *  their code followed by a second header for the path followed by the actual
 681  *  path data. Followed by the flags for each point. The pathheader contains
 682  *  the size of the data to follow, a version number again, followed by a count
 683  *  of how many points, and any special flags which may apply. 0x4000 means its
 684  *  a path of shorts instead of FLOAT.
 685  *
 686  *  Combining Ops are stored in reverse order from when they were constructed;
 687  *  the output is a tree where the left side combining area is always taken
 688  *  first.
 689  */
 690 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 691         UINT *needed)
 692 {
 693     INT filled = 0;
 694
 695     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 696
 697     if (!(region && buffer && size))
 698         return InvalidParameter;
 699
 700     memcpy(buffer, &region->header, sizeof(region->header));
 701     filled += sizeof(region->header) / sizeof(DWORD);
 702     /* With few exceptions, everything written is DWORD aligned,
 703      * so use that as our base */
 704     write_element(&region->node, (DWORD*)buffer, &filled);
 705
 706     if (needed)
 707         *needed = filled * sizeof(DWORD);
 708
 709     return Ok;
 710 }
 711
 712 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 713 {
 714     TRACE("%p, %p\n", region, needed);
 715
 716     if (!(region && needed))
 717         return InvalidParameter;
 718
 719     /* header.size doesn't count header.size and header.checksum */
 720     *needed = region->header.size + sizeof(DWORD) * 2;
 721
 722     return Ok;
 723 }
 724
 725 /*****************************************************************************
 726  * GdipGetRegionHRgn [GDIPLUS.@]
 727  */
 728 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
 729 {
 730     FIXME("(%p, %p, %p): stub\n", region, graphics, hrgn);
 731
 732     *hrgn = NULL;
 733     return NotImplemented;
 734 }
 735
 736 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 737 {
 738     FIXME("(%p, %p, %p): stub\n", region, graphics, res);
 739
 740     return NotImplemented;
 741 }
 742
 743 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
 744                                       BOOL *res)
 745 {
 746     FIXME("(%p, %p, %p, %p): stub\n", region, region2, graphics, res);
 747
 748     return NotImplemented;
 749 }
 750
 751 /* I think graphics is ignored here */
 752 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 753 {
 754     TRACE("(%p, %p, %p)\n", region, graphics, res);
 755
 756     if(!region || !graphics || !res)
 757         return InvalidParameter;
 758
 759     *res = (region->node.type == RegionDataInfiniteRect);
 760
 761     return Ok;
 762 }
 763
 764 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
 765 {
 766     GpStatus stat;
 767
 768     TRACE("%p\n", region);
 769
 770     if (!region)
 771         return InvalidParameter;
 772
 773     delete_element(&region->node);
 774     stat = init_region(region, RegionDataEmptyRect);
 775
 776     return stat;
 777 }
 778
 779 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
 780 {
 781     GpStatus stat;
 782
 783     TRACE("%p\n", region);
 784
 785     if (!region)
 786         return InvalidParameter;
 787
 788     delete_element(&region->node);
 789     stat = init_region(region, RegionDataInfiniteRect);
 790
 791     return stat;
 792 }
 793
 794 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
 795 {
 796     FIXME("(%p, %p): stub\n", region, matrix);
 797
 798     return NotImplemented;
 799 }
 800
 801 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
 802 {
 803     FIXME("(%p, %f, %f): stub\n", region, dx, dy);
 804
 805     return NotImplemented;
 806 }
 807
 808 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
 809 {
 810     FIXME("(%p, %d, %d): stub\n", region, dx, dy);
 811
 812     return NotImplemented;
 813 }