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 typedef enum RegionType
  77 {
  78     RegionDataRect          = 0x10000000,
  79     RegionDataPath          = 0x10000001,
  80     RegionDataEmptyRect     = 0x10000002,
  81     RegionDataInfiniteRect  = 0x10000003,
  82 } RegionType;
  83
  84 #define FLAGS_NOFLAGS   0x0
  85 #define FLAGS_INTPATH   0x4000
  86
  87 /* Header size as far as header->size is concerned. This doesn't include
  88  * header->size or header->checksum
  89  */
  90 static const INT sizeheader_size = sizeof(DWORD) * 2;
  91
  92 typedef struct packed_point
  93 {
  94     short X;
  95     short Y;
  96 } packed_point;
  97
  98 /* Everything is measured in DWORDS; round up if there's a remainder */
  99 static inline INT get_pathtypes_size(const GpPath* path)
 100 {
 101     INT needed = path->pathdata.Count / sizeof(DWORD);
 102
 103     if (path->pathdata.Count % sizeof(DWORD) > 0)
 104         needed++;
 105
 106     return needed * sizeof(DWORD);
 107 }
 108
 109 static inline INT get_element_size(const region_element* element)
 110 {
 111     INT needed = sizeof(DWORD); /* DWORD for the type */
 112     switch(element->type)
 113     {
 114         case RegionDataRect:
 115             return needed + sizeof(GpRect);
 116         case RegionDataPath:
 117              needed += element->elementdata.pathdata.pathheader.size;
 118              needed += sizeof(DWORD); /* Extra DWORD for pathheader.size */
 119              return needed;
 120         case RegionDataEmptyRect:
 121         case RegionDataInfiniteRect:
 122             return needed;
 123         default:
 124             needed += get_element_size(element->elementdata.combine.left);
 125             needed += get_element_size(element->elementdata.combine.right);
 126             return needed;
 127     }
 128
 129     return 0;
 130 }
 131
 132 /* Does not check parameters, caller must do that */
 133 static inline GpStatus init_region(GpRegion* region, const RegionType type)
 134 {
 135     region->node.type       = type;
 136     region->header.checksum = 0xdeadbeef;
 137     region->header.magic    = VERSION_MAGIC;
 138     region->header.num_children  = 0;
 139     region->header.size     = sizeheader_size + get_element_size(&region->node);
 140
 141     return Ok;
 142 }
 143
 144 static inline void delete_element(region_element* element)
 145 {
 146     switch(element->type)
 147     {
 148         case RegionDataRect:
 149             break;
 150         case RegionDataPath:
 151             GdipDeletePath(element->elementdata.pathdata.path);
 152             break;
 153         case RegionDataEmptyRect:
 154         case RegionDataInfiniteRect:
 155             break;
 156         default:
 157             delete_element(element->elementdata.combine.left);
 158             delete_element(element->elementdata.combine.right);
 159             GdipFree(element->elementdata.combine.left);
 160             GdipFree(element->elementdata.combine.right);
 161             break;
 162     }
 163 }
 164
 165 static inline GpStatus clone_element(const region_element* element,
 166         region_element** element2)
 167 {
 168     GpStatus stat;
 169
 170     *element2 = GdipAlloc(sizeof(region_element));
 171     if (!*element2)
 172         return OutOfMemory;
 173
 174     (*element2)->type = element->type;
 175
 176     switch (element->type)
 177     {
 178         case RegionDataRect:
 179             (*element2)->elementdata.rect = element->elementdata.rect;
 180             break;
 181         case RegionDataEmptyRect:
 182         case RegionDataInfiniteRect:
 183             break;
 184         case RegionDataPath:
 185             (*element2)->elementdata.pathdata.pathheader = element->elementdata.pathdata.pathheader;
 186             stat = GdipClonePath(element->elementdata.pathdata.path,
 187                     &(*element2)->elementdata.pathdata.path);
 188             if (stat != Ok) goto clone_out;
 189             break;
 190         default:
 191             stat = clone_element(element->elementdata.combine.left,
 192                     &(*element2)->elementdata.combine.left);
 193             if (stat != Ok) goto clone_out;
 194             stat = clone_element(element->elementdata.combine.right,
 195                     &(*element2)->elementdata.combine.right);
 196             if (stat != Ok) goto clone_out;
 197             break;
 198     }
 199
 200     return Ok;
 201
 202 clone_out:
 203     delete_element(*element2);
 204     *element2 = NULL;
 205     return stat;
 206 }
 207
 208 /* Common code for CombineRegion*
 209  * All the caller has to do is get its format into an element
 210  */
 211 static inline void fuse_region(GpRegion* region, region_element* left,
 212         region_element* right, const CombineMode mode)
 213 {
 214     region->node.type = mode;
 215     region->node.elementdata.combine.left = left;
 216     region->node.elementdata.combine.right = right;
 217
 218     region->header.size = sizeheader_size + get_element_size(&region->node);
 219     region->header.num_children += 2;
 220 }
 221
 222 /*****************************************************************************
 223  * GdipCloneRegion [GDIPLUS.@]
 224  *
 225  * Creates a deep copy of the region
 226  *
 227  * PARAMS
 228  *  region  [I] source region
 229  *  clone   [O] resulting clone
 230  *
 231  * RETURNS
 232  *  SUCCESS: Ok
 233  *  FAILURE: InvalidParameter or OutOfMemory
 234  */
 235 GpStatus WINGDIPAPI GdipCloneRegion(GpRegion *region, GpRegion **clone)
 236 {
 237     region_element *element;
 238
 239     TRACE("%p %p\n", region, clone);
 240
 241     if (!(region && clone))
 242         return InvalidParameter;
 243
 244     *clone = GdipAlloc(sizeof(GpRegion));
 245     if (!*clone)
 246         return OutOfMemory;
 247     element = &(*clone)->node;
 248
 249     (*clone)->header = region->header;
 250     return clone_element(&region->node, &element);
 251 }
 252
 253 GpStatus WINGDIPAPI GdipCombineRegionPath(GpRegion *region, GpPath *path, CombineMode mode)
 254 {
 255     GpRegion *path_region;
 256     region_element *left, *right = NULL;
 257     GpStatus stat;
 258
 259     TRACE("%p %p %d\n", region, path, mode);
 260
 261     if (!(region && path))
 262         return InvalidParameter;
 263
 264     stat = GdipCreateRegionPath(path, &path_region);
 265     if (stat != Ok)
 266         return stat;
 267
 268     left = GdipAlloc(sizeof(region_element));
 269     if (!left)
 270         goto out;
 271     *left = region->node;
 272
 273     stat = clone_element(&path_region->node, &right);
 274     if (stat != Ok)
 275         goto out;
 276
 277     fuse_region(region, left, right, mode);
 278
 279     GdipDeleteRegion(path_region);
 280     return Ok;
 281
 282 out:
 283     GdipFree(left);
 284     delete_element(right);
 285     GdipDeleteRegion(path_region);
 286     return stat;
 287 }
 288
 289 GpStatus WINGDIPAPI GdipCombineRegionRect(GpRegion *region,
 290         GDIPCONST GpRectF *rect, CombineMode mode)
 291 {
 292     GpRegion *rect_region;
 293     region_element *left, *right = NULL;
 294     GpStatus stat;
 295
 296     TRACE("%p %p %d\n", region, rect, mode);
 297
 298     if (!(region && rect))
 299         return InvalidParameter;
 300
 301     stat = GdipCreateRegionRect(rect, &rect_region);
 302     if (stat != Ok)
 303         return stat;
 304
 305     left = GdipAlloc(sizeof(region_element));
 306     if (!left)
 307         goto out;
 308     memcpy(left, &region->node, sizeof(region_element));
 309
 310     stat = clone_element(&rect_region->node, &right);
 311     if (stat != Ok)
 312         goto out;
 313
 314     fuse_region(region, left, right, mode);
 315
 316     GdipDeleteRegion(rect_region);
 317     return Ok;
 318
 319 out:
 320     GdipFree(left);
 321     delete_element(right);
 322     GdipDeleteRegion(rect_region);
 323     return stat;
 324 }
 325
 326 GpStatus WINGDIPAPI GdipCombineRegionRectI(GpRegion *region,
 327         GDIPCONST GpRect *rect, CombineMode mode)
 328 {
 329     GpRectF rectf;
 330
 331     TRACE("%p %p %d\n", region, rect, mode);
 332
 333     if (!rect)
 334         return InvalidParameter;
 335
 336     rectf.X = (REAL)rect->X;
 337     rectf.Y = (REAL)rect->Y;
 338     rectf.Height = (REAL)rect->Height;
 339     rectf.Width = (REAL)rect->Width;
 340
 341     return GdipCombineRegionRect(region, &rectf, mode);
 342 }
 343
 344 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
 345         GpRegion *region2, CombineMode mode)
 346 {
 347     region_element *left, *right;
 348     GpStatus stat;
 349
 350     TRACE("%p %p %d\n", region1, region2, mode);
 351
 352     if(!(region1 && region2))
 353         return InvalidParameter;
 354
 355     left  = GdipAlloc(sizeof(region_element));
 356     if (!left)
 357         return OutOfMemory;
 358
 359     *left = region1->node;
 360     stat = clone_element(&region2->node, &right);
 361     if (stat != Ok)
 362     {
 363         GdipFree(left);
 364         delete_element(right);
 365         return OutOfMemory;
 366     }
 367
 368     fuse_region(region1, left, right, mode);
 369     region1->header.num_children += region2->header.num_children;
 370
 371     return Ok;
 372 }
 373
 374 GpStatus WINGDIPAPI GdipCreateRegion(GpRegion **region)
 375 {
 376     if(!region)
 377         return InvalidParameter;
 378
 379     TRACE("%p\n", region);
 380
 381     *region = GdipAlloc(sizeof(GpRegion));
 382     if(!*region)
 383         return OutOfMemory;
 384
 385     return init_region(*region, RegionDataInfiniteRect);
 386 }
 387
 388 /*****************************************************************************
 389  * GdipCreateRegionPath [GDIPLUS.@]
 390  *
 391  * Creates a GpRegion from a GpPath
 392  *
 393  * PARAMS
 394  *  path    [I] path to base the region on
 395  *  region  [O] pointer to the newly allocated region
 396  *
 397  * RETURNS
 398  *  SUCCESS: Ok
 399  *  FAILURE: InvalidParameter
 400  *
 401  * NOTES
 402  *  If a path has no floating point points, its points will be stored as shorts
 403  *  (INTPATH)
 404  *
 405  *  If a path is empty, it is considered to be an INTPATH
 406  */
 407 GpStatus WINGDIPAPI GdipCreateRegionPath(GpPath *path, GpRegion **region)
 408 {
 409     region_element* element;
 410     GpPoint  *pointsi;
 411     GpPointF *pointsf;
 412
 413     GpStatus stat;
 414     DWORD flags = FLAGS_INTPATH;
 415     INT count, i;
 416
 417     TRACE("%p, %p\n", path, region);
 418
 419     if (!(path && region))
 420         return InvalidParameter;
 421
 422     *region = GdipAlloc(sizeof(GpRegion));
 423     if(!*region)
 424         return OutOfMemory;
 425     stat = init_region(*region, RegionDataPath);
 426     if (stat != Ok)
 427     {
 428         GdipDeleteRegion(*region);
 429         return stat;
 430     }
 431     element = &(*region)->node;
 432     count = path->pathdata.Count;
 433
 434     /* Test to see if the path is an Integer path */
 435     if (count)
 436     {
 437         pointsi = GdipAlloc(sizeof(GpPoint) * count);
 438         pointsf = GdipAlloc(sizeof(GpPointF) * count);
 439         if (!(pointsi && pointsf))
 440         {
 441             GdipFree(pointsi);
 442             GdipFree(pointsf);
 443             GdipDeleteRegion(*region);
 444             return OutOfMemory;
 445         }
 446
 447         stat = GdipGetPathPointsI(path, pointsi, count);
 448         if (stat != Ok)
 449         {
 450             GdipDeleteRegion(*region);
 451             return stat;
 452         }
 453         stat = GdipGetPathPoints(path, pointsf, count);
 454         if (stat != Ok)
 455         {
 456             GdipDeleteRegion(*region);
 457             return stat;
 458         }
 459
 460         for (i = 0; i < count; i++)
 461         {
 462             if (!(pointsi[i].X == pointsf[i].X &&
 463                   pointsi[i].Y == pointsf[i].Y ))
 464             {
 465                 flags = FLAGS_NOFLAGS;
 466                 break;
 467             }
 468         }
 469         GdipFree(pointsi);
 470         GdipFree(pointsf);
 471     }
 472
 473     stat = GdipClonePath(path, &element->elementdata.pathdata.path);
 474     if (stat != Ok)
 475     {
 476         GdipDeleteRegion(*region);
 477         return stat;
 478     }
 479
 480     /* 3 for headers, once again size doesn't count itself */
 481     element->elementdata.pathdata.pathheader.size = ((sizeof(DWORD) * 3));
 482     switch(flags)
 483     {
 484         /* Floats, sent out as floats */
 485         case FLAGS_NOFLAGS:
 486             element->elementdata.pathdata.pathheader.size +=
 487                 (sizeof(DWORD) * count * 2);
 488             break;
 489         /* INTs, sent out as packed shorts */
 490         case FLAGS_INTPATH:
 491             element->elementdata.pathdata.pathheader.size +=
 492                 (sizeof(DWORD) * count);
 493             break;
 494         default:
 495             FIXME("Unhandled flags (%08x). Expect wrong results.\n", flags);
 496     }
 497     element->elementdata.pathdata.pathheader.size += get_pathtypes_size(path);
 498     element->elementdata.pathdata.pathheader.magic = VERSION_MAGIC;
 499     element->elementdata.pathdata.pathheader.count = count;
 500     element->elementdata.pathdata.pathheader.flags = flags;
 501     (*region)->header.size = sizeheader_size + get_element_size(element);
 502
 503     return Ok;
 504 }
 505
 506 GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect,
 507         GpRegion **region)
 508 {
 509     GpStatus stat;
 510
 511     TRACE("%p, %p\n", rect, region);
 512
 513     if (!(rect && region))
 514         return InvalidParameter;
 515
 516     *region = GdipAlloc(sizeof(GpRegion));
 517     stat = init_region(*region, RegionDataRect);
 518     if(stat != Ok)
 519     {
 520         GdipDeleteRegion(*region);
 521         return stat;
 522     }
 523
 524     (*region)->node.elementdata.rect.X = rect->X;
 525     (*region)->node.elementdata.rect.Y = rect->Y;
 526     (*region)->node.elementdata.rect.Width = rect->Width;
 527     (*region)->node.elementdata.rect.Height = rect->Height;
 528
 529     return Ok;
 530 }
 531
 532 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
 533         GpRegion **region)
 534 {
 535     GpRectF rectf;
 536
 537     TRACE("%p, %p\n", rect, region);
 538
 539     rectf.X = (REAL)rect->X;
 540     rectf.Y = (REAL)rect->Y;
 541     rectf.Width = (REAL)rect->Width;
 542     rectf.Height = (REAL)rect->Height;
 543
 544     return GdipCreateRegionRect(&rectf, region);
 545 }
 546
 547 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 548 {
 549     FIXME("(%p, %d, %p): stub\n", data, size, region);
 550
 551     *region = NULL;
 552     return NotImplemented;
 553 }
 554
 555 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 556 {
 557     FIXME("(%p, %p): stub\n", hrgn, region);
 558
 559     *region = NULL;
 560     return NotImplemented;
 561 }
 562
 563 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 564 {
 565     TRACE("%p\n", region);
 566
 567     if (!region)
 568         return InvalidParameter;
 569
 570     delete_element(&region->node);
 571     GdipFree(region);
 572
 573     return Ok;
 574 }
 575
 576 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 577 {
 578     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 579
 580     return NotImplemented;
 581 }
 582
 583 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 584 {
 585     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 586
 587     return NotImplemented;
 588 }
 589
 590 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 591 {
 592     location[*offset] = write;
 593     (*offset)++;
 594 }
 595
 596 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 597 {
 598     ((FLOAT*)location)[*offset] = write;
 599     (*offset)++;
 600 }
 601
 602 static inline void write_packed_point(DWORD* location, INT* offset,
 603         const GpPointF* write)
 604 {
 605     packed_point point;
 606
 607     point.X = write->X;
 608     point.Y = write->Y;
 609     memcpy(location + *offset, &point, sizeof(packed_point));
 610     (*offset)++;
 611 }
 612
 613 static inline void write_path_types(DWORD* location, INT* offset,
 614         const GpPath* path)
 615 {
 616     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 617
 618     /* The unwritten parts of the DWORD (if any) must be cleared */
 619     if (path->pathdata.Count % sizeof(DWORD))
 620         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 621                 path->pathdata.Count,
 622                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 623     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 624 }
 625
 626 static void write_element(const region_element* element, DWORD *buffer,
 627         INT* filled)
 628 {
 629     write_dword(buffer, filled, element->type);
 630     switch (element->type)
 631     {
 632         case CombineModeReplace:
 633         case CombineModeIntersect:
 634         case CombineModeUnion:
 635         case CombineModeXor:
 636         case CombineModeExclude:
 637         case CombineModeComplement:
 638             write_element(element->elementdata.combine.left, buffer, filled);
 639             write_element(element->elementdata.combine.right, buffer, filled);
 640             break;
 641         case RegionDataRect:
 642             write_float(buffer, filled, element->elementdata.rect.X);
 643             write_float(buffer, filled, element->elementdata.rect.Y);
 644             write_float(buffer, filled, element->elementdata.rect.Width);
 645             write_float(buffer, filled, element->elementdata.rect.Height);
 646             break;
 647         case RegionDataPath:
 648         {
 649             INT i;
 650             const GpPath* path = element->elementdata.pathdata.path;
 651
 652             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 653                     sizeof(element->elementdata.pathdata.pathheader));
 654             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 655             switch (element->elementdata.pathdata.pathheader.flags)
 656             {
 657                 case FLAGS_NOFLAGS:
 658                     for (i = 0; i < path->pathdata.Count; i++)
 659                     {
 660                         write_float(buffer, filled, path->pathdata.Points[i].X);
 661                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 662                     }
 663                     break;
 664                 case FLAGS_INTPATH:
 665                     for (i = 0; i < path->pathdata.Count; i++)
 666                     {
 667                         write_packed_point(buffer, filled,
 668                                 &path->pathdata.Points[i]);
 669                     }
 670             }
 671             write_path_types(buffer, filled, path);
 672             break;
 673         }
 674         case RegionDataEmptyRect:
 675         case RegionDataInfiniteRect:
 676             break;
 677     }
 678 }
 679
 680 /*****************************************************************************
 681  * GdipGetRegionData [GDIPLUS.@]
 682  *
 683  * Returns the header, followed by combining ops and region elements.
 684  *
 685  * PARAMS
 686  *  region  [I] region to retrieve from
 687  *  buffer  [O] buffer to hold the resulting data
 688  *  size    [I] size of the buffer
 689  *  needed  [O] (optional) how much data was written
 690  *
 691  * RETURNS
 692  *  SUCCESS: Ok
 693  *  FAILURE: InvalidParamter
 694  *
 695  * NOTES
 696  *  The header contains the size, a checksum, a version string, and the number
 697  *  of children. The size does not count itself or the checksum.
 698  *  Version is always something like 0xdbc01001 or 0xdbc01002
 699  *
 700  *  An element is a RECT, or PATH; Combining ops are stored as their
 701  *  CombineMode value. Special regions (infinite, empty) emit just their
 702  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 703  *  their code followed by a second header for the path followed by the actual
 704  *  path data. Followed by the flags for each point. The pathheader contains
 705  *  the size of the data to follow, a version number again, followed by a count
 706  *  of how many points, and any special flags which may apply. 0x4000 means its
 707  *  a path of shorts instead of FLOAT.
 708  *
 709  *  Combining Ops are stored in reverse order from when they were constructed;
 710  *  the output is a tree where the left side combining area is always taken
 711  *  first.
 712  */
 713 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 714         UINT *needed)
 715 {
 716     INT filled = 0;
 717
 718     if (!(region && buffer && size))
 719         return InvalidParameter;
 720
 721     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 722     memcpy(buffer, &region->header, sizeof(region->header));
 723     filled += sizeof(region->header) / sizeof(DWORD);
 724     /* With few exceptions, everything written is DWORD aligned,
 725      * so use that as our base */
 726     write_element(&region->node, (DWORD*)buffer, &filled);
 727
 728     if (needed)
 729         *needed = filled * sizeof(DWORD);
 730
 731     return Ok;
 732 }
 733
 734 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 735 {
 736     if (!(region && needed))
 737         return InvalidParameter;
 738
 739     TRACE("%p, %p\n", region, needed);
 740
 741     /* header.size doesn't count header.size and header.checksum */
 742     *needed = region->header.size + sizeof(DWORD) * 2;
 743
 744     return Ok;
 745 }
 746
 747 /*****************************************************************************
 748  * GdipGetRegionHRgn [GDIPLUS.@]
 749  */
 750 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
 751 {
 752     FIXME("(%p, %p, %p): stub\n", region, graphics, hrgn);
 753
 754     *hrgn = NULL;
 755     return NotImplemented;
 756 }
 757
 758 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 759 {
 760     FIXME("(%p, %p, %p): stub\n", region, graphics, res);
 761
 762     return NotImplemented;
 763 }
 764
 765 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
 766                                       BOOL *res)
 767 {
 768     FIXME("(%p, %p, %p, %p): stub\n", region, region2, graphics, res);
 769
 770     return NotImplemented;
 771 }
 772
 773 /* I think graphics is ignored here */
 774 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 775 {
 776     TRACE("(%p, %p, %p)\n", region, graphics, res);
 777
 778     if(!region || !graphics || !res)
 779         return InvalidParameter;
 780
 781     *res = (region->node.type == RegionDataInfiniteRect);
 782
 783     return Ok;
 784 }
 785
 786 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
 787 {
 788     GpStatus stat;
 789
 790     TRACE("%p\n", region);
 791
 792     if (!region)
 793         return InvalidParameter;
 794
 795     delete_element(&region->node);
 796     stat = init_region(region, RegionDataEmptyRect);
 797
 798     return stat;
 799 }
 800
 801 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
 802 {
 803     GpStatus stat;
 804
 805     if (!region)
 806         return InvalidParameter;
 807
 808     TRACE("%p\n", region);
 809
 810     delete_element(&region->node);
 811     stat = init_region(region, RegionDataInfiniteRect);
 812
 813     return stat;
 814 }
 815
 816 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
 817 {
 818     FIXME("(%p, %p): stub\n", region, matrix);
 819
 820     return NotImplemented;
 821 }
 822
 823 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
 824 {
 825     FIXME("(%p, %f, %f): stub\n", region, dx, dy);
 826
 827     return NotImplemented;
 828 }
 829
 830 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
 831 {
 832     FIXME("(%p, %d, %d): stub\n", region, dx, dy);
 833
 834     return NotImplemented;
 835 }