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     /* simply replace region data */
 246     if(mode == CombineModeReplace){
 247         delete_element(&region->node);
 248         memcpy(region, path_region, sizeof(GpRegion));
 249         return Ok;
 250     }
 251
 252     left = GdipAlloc(sizeof(region_element));
 253     if (!left)
 254         goto out;
 255     *left = region->node;
 256
 257     stat = clone_element(&path_region->node, &right);
 258     if (stat != Ok)
 259         goto out;
 260
 261     fuse_region(region, left, right, mode);
 262
 263     GdipDeleteRegion(path_region);
 264     return Ok;
 265
 266 out:
 267     GdipFree(left);
 268     delete_element(right);
 269     GdipDeleteRegion(path_region);
 270     return stat;
 271 }
 272
 273 GpStatus WINGDIPAPI GdipCombineRegionRect(GpRegion *region,
 274         GDIPCONST GpRectF *rect, CombineMode mode)
 275 {
 276     GpRegion *rect_region;
 277     region_element *left, *right = NULL;
 278     GpStatus stat;
 279
 280     TRACE("%p %p %d\n", region, rect, mode);
 281
 282     if (!(region && rect))
 283         return InvalidParameter;
 284
 285     stat = GdipCreateRegionRect(rect, &rect_region);
 286     if (stat != Ok)
 287         return stat;
 288
 289     /* simply replace region data */
 290     if(mode == CombineModeReplace){
 291         delete_element(&region->node);
 292         memcpy(region, rect_region, sizeof(GpRegion));
 293         return Ok;
 294     }
 295
 296     left = GdipAlloc(sizeof(region_element));
 297     if (!left)
 298         goto out;
 299     memcpy(left, &region->node, sizeof(region_element));
 300
 301     stat = clone_element(&rect_region->node, &right);
 302     if (stat != Ok)
 303         goto out;
 304
 305     fuse_region(region, left, right, mode);
 306
 307     GdipDeleteRegion(rect_region);
 308     return Ok;
 309
 310 out:
 311     GdipFree(left);
 312     delete_element(right);
 313     GdipDeleteRegion(rect_region);
 314     return stat;
 315 }
 316
 317 GpStatus WINGDIPAPI GdipCombineRegionRectI(GpRegion *region,
 318         GDIPCONST GpRect *rect, CombineMode mode)
 319 {
 320     GpRectF rectf;
 321
 322     TRACE("%p %p %d\n", region, rect, mode);
 323
 324     if (!rect)
 325         return InvalidParameter;
 326
 327     rectf.X = (REAL)rect->X;
 328     rectf.Y = (REAL)rect->Y;
 329     rectf.Height = (REAL)rect->Height;
 330     rectf.Width = (REAL)rect->Width;
 331
 332     return GdipCombineRegionRect(region, &rectf, mode);
 333 }
 334
 335 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
 336         GpRegion *region2, CombineMode mode)
 337 {
 338     region_element *left, *right = NULL;
 339     GpStatus stat;
 340     GpRegion *reg2copy;
 341
 342     TRACE("%p %p %d\n", region1, region2, mode);
 343
 344     if(!(region1 && region2))
 345         return InvalidParameter;
 346
 347     /* simply replace region data */
 348     if(mode == CombineModeReplace){
 349         stat = GdipCloneRegion(region2, &reg2copy);
 350         if(stat != Ok)  return stat;
 351
 352         delete_element(&region1->node);
 353         memcpy(region1, reg2copy, sizeof(GpRegion));
 354         return Ok;
 355     }
 356
 357     left  = GdipAlloc(sizeof(region_element));
 358     if (!left)
 359         return OutOfMemory;
 360
 361     *left = region1->node;
 362     stat = clone_element(&region2->node, &right);
 363     if (stat != Ok)
 364     {
 365         GdipFree(left);
 366         delete_element(right);
 367         return OutOfMemory;
 368     }
 369
 370     fuse_region(region1, left, right, mode);
 371     region1->header.num_children += region2->header.num_children;
 372
 373     return Ok;
 374 }
 375
 376 GpStatus WINGDIPAPI GdipCreateRegion(GpRegion **region)
 377 {
 378     TRACE("%p\n", region);
 379
 380     if(!region)
 381         return InvalidParameter;
 382
 383     *region = GdipAlloc(sizeof(GpRegion));
 384     if(!*region)
 385         return OutOfMemory;
 386
 387     return init_region(*region, RegionDataInfiniteRect);
 388 }
 389
 390 /*****************************************************************************
 391  * GdipCreateRegionPath [GDIPLUS.@]
 392  *
 393  * Creates a GpRegion from a GpPath
 394  *
 395  * PARAMS
 396  *  path    [I] path to base the region on
 397  *  region  [O] pointer to the newly allocated region
 398  *
 399  * RETURNS
 400  *  SUCCESS: Ok
 401  *  FAILURE: InvalidParameter
 402  *
 403  * NOTES
 404  *  If a path has no floating point points, its points will be stored as shorts
 405  *  (INTPATH)
 406  *
 407  *  If a path is empty, it is considered to be an INTPATH
 408  */
 409 GpStatus WINGDIPAPI GdipCreateRegionPath(GpPath *path, GpRegion **region)
 410 {
 411     region_element* element;
 412     GpPoint  *pointsi;
 413     GpPointF *pointsf;
 414
 415     GpStatus stat;
 416     DWORD flags = FLAGS_INTPATH;
 417     INT count, i;
 418
 419     TRACE("%p, %p\n", path, region);
 420
 421     if (!(path && region))
 422         return InvalidParameter;
 423
 424     *region = GdipAlloc(sizeof(GpRegion));
 425     if(!*region)
 426         return OutOfMemory;
 427     stat = init_region(*region, RegionDataPath);
 428     if (stat != Ok)
 429     {
 430         GdipDeleteRegion(*region);
 431         return stat;
 432     }
 433     element = &(*region)->node;
 434     count = path->pathdata.Count;
 435
 436     /* Test to see if the path is an Integer path */
 437     if (count)
 438     {
 439         pointsi = GdipAlloc(sizeof(GpPoint) * count);
 440         pointsf = GdipAlloc(sizeof(GpPointF) * count);
 441         if (!(pointsi && pointsf))
 442         {
 443             GdipFree(pointsi);
 444             GdipFree(pointsf);
 445             GdipDeleteRegion(*region);
 446             return OutOfMemory;
 447         }
 448
 449         stat = GdipGetPathPointsI(path, pointsi, count);
 450         if (stat != Ok)
 451         {
 452             GdipDeleteRegion(*region);
 453             return stat;
 454         }
 455         stat = GdipGetPathPoints(path, pointsf, count);
 456         if (stat != Ok)
 457         {
 458             GdipDeleteRegion(*region);
 459             return stat;
 460         }
 461
 462         for (i = 0; i < count; i++)
 463         {
 464             if (!(pointsi[i].X == pointsf[i].X &&
 465                   pointsi[i].Y == pointsf[i].Y ))
 466             {
 467                 flags = FLAGS_NOFLAGS;
 468                 break;
 469             }
 470         }
 471         GdipFree(pointsi);
 472         GdipFree(pointsf);
 473     }
 474
 475     stat = GdipClonePath(path, &element->elementdata.pathdata.path);
 476     if (stat != Ok)
 477     {
 478         GdipDeleteRegion(*region);
 479         return stat;
 480     }
 481
 482     /* 3 for headers, once again size doesn't count itself */
 483     element->elementdata.pathdata.pathheader.size = ((sizeof(DWORD) * 3));
 484     switch(flags)
 485     {
 486         /* Floats, sent out as floats */
 487         case FLAGS_NOFLAGS:
 488             element->elementdata.pathdata.pathheader.size +=
 489                 (sizeof(DWORD) * count * 2);
 490             break;
 491         /* INTs, sent out as packed shorts */
 492         case FLAGS_INTPATH:
 493             element->elementdata.pathdata.pathheader.size +=
 494                 (sizeof(DWORD) * count);
 495             break;
 496         default:
 497             FIXME("Unhandled flags (%08x). Expect wrong results.\n", flags);
 498     }
 499     element->elementdata.pathdata.pathheader.size += get_pathtypes_size(path);
 500     element->elementdata.pathdata.pathheader.magic = VERSION_MAGIC;
 501     element->elementdata.pathdata.pathheader.count = count;
 502     element->elementdata.pathdata.pathheader.flags = flags;
 503     (*region)->header.size = sizeheader_size + get_element_size(element);
 504
 505     return Ok;
 506 }
 507
 508 GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect,
 509         GpRegion **region)
 510 {
 511     GpStatus stat;
 512
 513     TRACE("%p, %p\n", rect, region);
 514
 515     if (!(rect && region))
 516         return InvalidParameter;
 517
 518     *region = GdipAlloc(sizeof(GpRegion));
 519     stat = init_region(*region, RegionDataRect);
 520     if(stat != Ok)
 521     {
 522         GdipDeleteRegion(*region);
 523         return stat;
 524     }
 525
 526     (*region)->node.elementdata.rect.X = rect->X;
 527     (*region)->node.elementdata.rect.Y = rect->Y;
 528     (*region)->node.elementdata.rect.Width = rect->Width;
 529     (*region)->node.elementdata.rect.Height = rect->Height;
 530
 531     return Ok;
 532 }
 533
 534 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
 535         GpRegion **region)
 536 {
 537     GpRectF rectf;
 538
 539     TRACE("%p, %p\n", rect, region);
 540
 541     rectf.X = (REAL)rect->X;
 542     rectf.Y = (REAL)rect->Y;
 543     rectf.Width = (REAL)rect->Width;
 544     rectf.Height = (REAL)rect->Height;
 545
 546     return GdipCreateRegionRect(&rectf, region);
 547 }
 548
 549 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 550 {
 551     FIXME("(%p, %d, %p): stub\n", data, size, region);
 552
 553     *region = NULL;
 554     return NotImplemented;
 555 }
 556
 557 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 558 {
 559     FIXME("(%p, %p): stub\n", hrgn, region);
 560
 561     *region = NULL;
 562     return NotImplemented;
 563 }
 564
 565 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 566 {
 567     TRACE("%p\n", region);
 568
 569     if (!region)
 570         return InvalidParameter;
 571
 572     delete_element(&region->node);
 573     GdipFree(region);
 574
 575     return Ok;
 576 }
 577
 578 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 579 {
 580     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 581
 582     return NotImplemented;
 583 }
 584
 585 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 586 {
 587     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 588
 589     return NotImplemented;
 590 }
 591
 592 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 593 {
 594     location[*offset] = write;
 595     (*offset)++;
 596 }
 597
 598 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 599 {
 600     ((FLOAT*)location)[*offset] = write;
 601     (*offset)++;
 602 }
 603
 604 static inline void write_packed_point(DWORD* location, INT* offset,
 605         const GpPointF* write)
 606 {
 607     packed_point point;
 608
 609     point.X = write->X;
 610     point.Y = write->Y;
 611     memcpy(location + *offset, &point, sizeof(packed_point));
 612     (*offset)++;
 613 }
 614
 615 static inline void write_path_types(DWORD* location, INT* offset,
 616         const GpPath* path)
 617 {
 618     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 619
 620     /* The unwritten parts of the DWORD (if any) must be cleared */
 621     if (path->pathdata.Count % sizeof(DWORD))
 622         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 623                 path->pathdata.Count,
 624                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 625     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 626 }
 627
 628 static void write_element(const region_element* element, DWORD *buffer,
 629         INT* filled)
 630 {
 631     write_dword(buffer, filled, element->type);
 632     switch (element->type)
 633     {
 634         case CombineModeReplace:
 635         case CombineModeIntersect:
 636         case CombineModeUnion:
 637         case CombineModeXor:
 638         case CombineModeExclude:
 639         case CombineModeComplement:
 640             write_element(element->elementdata.combine.left, buffer, filled);
 641             write_element(element->elementdata.combine.right, buffer, filled);
 642             break;
 643         case RegionDataRect:
 644             write_float(buffer, filled, element->elementdata.rect.X);
 645             write_float(buffer, filled, element->elementdata.rect.Y);
 646             write_float(buffer, filled, element->elementdata.rect.Width);
 647             write_float(buffer, filled, element->elementdata.rect.Height);
 648             break;
 649         case RegionDataPath:
 650         {
 651             INT i;
 652             const GpPath* path = element->elementdata.pathdata.path;
 653
 654             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 655                     sizeof(element->elementdata.pathdata.pathheader));
 656             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 657             switch (element->elementdata.pathdata.pathheader.flags)
 658             {
 659                 case FLAGS_NOFLAGS:
 660                     for (i = 0; i < path->pathdata.Count; i++)
 661                     {
 662                         write_float(buffer, filled, path->pathdata.Points[i].X);
 663                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 664                     }
 665                     break;
 666                 case FLAGS_INTPATH:
 667                     for (i = 0; i < path->pathdata.Count; i++)
 668                     {
 669                         write_packed_point(buffer, filled,
 670                                 &path->pathdata.Points[i]);
 671                     }
 672             }
 673             write_path_types(buffer, filled, path);
 674             break;
 675         }
 676         case RegionDataEmptyRect:
 677         case RegionDataInfiniteRect:
 678             break;
 679     }
 680 }
 681
 682 /*****************************************************************************
 683  * GdipGetRegionData [GDIPLUS.@]
 684  *
 685  * Returns the header, followed by combining ops and region elements.
 686  *
 687  * PARAMS
 688  *  region  [I] region to retrieve from
 689  *  buffer  [O] buffer to hold the resulting data
 690  *  size    [I] size of the buffer
 691  *  needed  [O] (optional) how much data was written
 692  *
 693  * RETURNS
 694  *  SUCCESS: Ok
 695  *  FAILURE: InvalidParamter
 696  *
 697  * NOTES
 698  *  The header contains the size, a checksum, a version string, and the number
 699  *  of children. The size does not count itself or the checksum.
 700  *  Version is always something like 0xdbc01001 or 0xdbc01002
 701  *
 702  *  An element is a RECT, or PATH; Combining ops are stored as their
 703  *  CombineMode value. Special regions (infinite, empty) emit just their
 704  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 705  *  their code followed by a second header for the path followed by the actual
 706  *  path data. Followed by the flags for each point. The pathheader contains
 707  *  the size of the data to follow, a version number again, followed by a count
 708  *  of how many points, and any special flags which may apply. 0x4000 means its
 709  *  a path of shorts instead of FLOAT.
 710  *
 711  *  Combining Ops are stored in reverse order from when they were constructed;
 712  *  the output is a tree where the left side combining area is always taken
 713  *  first.
 714  */
 715 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 716         UINT *needed)
 717 {
 718     INT filled = 0;
 719
 720     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 721
 722     if (!(region && buffer && size))
 723         return InvalidParameter;
 724
 725     memcpy(buffer, &region->header, sizeof(region->header));
 726     filled += sizeof(region->header) / sizeof(DWORD);
 727     /* With few exceptions, everything written is DWORD aligned,
 728      * so use that as our base */
 729     write_element(&region->node, (DWORD*)buffer, &filled);
 730
 731     if (needed)
 732         *needed = filled * sizeof(DWORD);
 733
 734     return Ok;
 735 }
 736
 737 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 738 {
 739     TRACE("%p, %p\n", region, needed);
 740
 741     if (!(region && needed))
 742         return InvalidParameter;
 743
 744     /* header.size doesn't count header.size and header.checksum */
 745     *needed = region->header.size + sizeof(DWORD) * 2;
 746
 747     return Ok;
 748 }
 749
 750 /*****************************************************************************
 751  * GdipGetRegionHRgn [GDIPLUS.@]
 752  */
 753 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
 754 {
 755     FIXME("(%p, %p, %p): stub\n", region, graphics, hrgn);
 756
 757     *hrgn = NULL;
 758     return NotImplemented;
 759 }
 760
 761 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 762 {
 763     TRACE("(%p, %p, %p)\n", region, graphics, res);
 764
 765     if(!region || !graphics || !res)
 766         return InvalidParameter;
 767
 768     *res = (region->node.type == RegionDataEmptyRect);
 769
 770     return Ok;
 771 }
 772
 773 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
 774                                       BOOL *res)
 775 {
 776     FIXME("(%p, %p, %p, %p): stub\n", region, region2, graphics, res);
 777
 778     return NotImplemented;
 779 }
 780
 781 /* I think graphics is ignored here */
 782 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 783 {
 784     TRACE("(%p, %p, %p)\n", region, graphics, res);
 785
 786     if(!region || !graphics || !res)
 787         return InvalidParameter;
 788
 789     *res = (region->node.type == RegionDataInfiniteRect);
 790
 791     return Ok;
 792 }
 793
 794 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
 795 {
 796     GpStatus stat;
 797
 798     TRACE("%p\n", region);
 799
 800     if (!region)
 801         return InvalidParameter;
 802
 803     delete_element(&region->node);
 804     stat = init_region(region, RegionDataEmptyRect);
 805
 806     return stat;
 807 }
 808
 809 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
 810 {
 811     GpStatus stat;
 812
 813     TRACE("%p\n", region);
 814
 815     if (!region)
 816         return InvalidParameter;
 817
 818     delete_element(&region->node);
 819     stat = init_region(region, RegionDataInfiniteRect);
 820
 821     return stat;
 822 }
 823
 824 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
 825 {
 826     FIXME("(%p, %p): stub\n", region, matrix);
 827
 828     return NotImplemented;
 829 }
 830
 831 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
 832 {
 833     FIXME("(%p, %f, %f): stub\n", region, dx, dy);
 834
 835     return NotImplemented;
 836 }
 837
 838 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
 839 {
 840     FIXME("(%p, %d, %d): stub\n", region, dx, dy);
 841
 842     return NotImplemented;
 843 }