reactos/dll/win32/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 /*****************************************************************************
 231  * GdipCombineRegionPath [GDIPLUS.@]
 232  */
 233 GpStatus WINGDIPAPI GdipCombineRegionPath(GpRegion *region, GpPath *path, CombineMode mode)
 234 {
 235     GpRegion *path_region;
 236     region_element *left, *right = NULL;
 237     GpStatus stat;
 238
 239     TRACE("%p %p %d\n", region, path, mode);
 240
 241     if (!(region && path))
 242         return InvalidParameter;
 243
 244     stat = GdipCreateRegionPath(path, &path_region);
 245     if (stat != Ok)
 246         return stat;
 247
 248     /* simply replace region data */
 249     if(mode == CombineModeReplace){
 250         delete_element(&region->node);
 251         memcpy(region, path_region, sizeof(GpRegion));
 252         return Ok;
 253     }
 254
 255     left = GdipAlloc(sizeof(region_element));
 256     if (!left)
 257         goto out;
 258     *left = region->node;
 259
 260     stat = clone_element(&path_region->node, &right);
 261     if (stat != Ok)
 262         goto out;
 263
 264     fuse_region(region, left, right, mode);
 265
 266     GdipDeleteRegion(path_region);
 267     return Ok;
 268
 269 out:
 270     GdipFree(left);
 271     GdipDeleteRegion(path_region);
 272     return stat;
 273 }
 274
 275 /*****************************************************************************
 276  * GdipCombineRegionRect [GDIPLUS.@]
 277  */
 278 GpStatus WINGDIPAPI GdipCombineRegionRect(GpRegion *region,
 279         GDIPCONST GpRectF *rect, CombineMode mode)
 280 {
 281     GpRegion *rect_region;
 282     region_element *left, *right = NULL;
 283     GpStatus stat;
 284
 285     TRACE("%p %p %d\n", region, rect, mode);
 286
 287     if (!(region && rect))
 288         return InvalidParameter;
 289
 290     stat = GdipCreateRegionRect(rect, &rect_region);
 291     if (stat != Ok)
 292         return stat;
 293
 294     /* simply replace region data */
 295     if(mode == CombineModeReplace){
 296         delete_element(&region->node);
 297         memcpy(region, rect_region, sizeof(GpRegion));
 298         return Ok;
 299     }
 300
 301     left = GdipAlloc(sizeof(region_element));
 302     if (!left)
 303         goto out;
 304     memcpy(left, &region->node, sizeof(region_element));
 305
 306     stat = clone_element(&rect_region->node, &right);
 307     if (stat != Ok)
 308         goto out;
 309
 310     fuse_region(region, left, right, mode);
 311
 312     GdipDeleteRegion(rect_region);
 313     return Ok;
 314
 315 out:
 316     GdipFree(left);
 317     GdipDeleteRegion(rect_region);
 318     return stat;
 319 }
 320
 321 /*****************************************************************************
 322  * GdipCombineRegionRectI [GDIPLUS.@]
 323  */
 324 GpStatus WINGDIPAPI GdipCombineRegionRectI(GpRegion *region,
 325         GDIPCONST GpRect *rect, CombineMode mode)
 326 {
 327     GpRectF rectf;
 328
 329     TRACE("%p %p %d\n", region, rect, mode);
 330
 331     if (!rect)
 332         return InvalidParameter;
 333
 334     rectf.X = (REAL)rect->X;
 335     rectf.Y = (REAL)rect->Y;
 336     rectf.Height = (REAL)rect->Height;
 337     rectf.Width = (REAL)rect->Width;
 338
 339     return GdipCombineRegionRect(region, &rectf, mode);
 340 }
 341
 342 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
 343         GpRegion *region2, CombineMode mode)
 344 {
 345     region_element *left, *right = NULL;
 346     GpStatus stat;
 347     GpRegion *reg2copy;
 348
 349     TRACE("%p %p %d\n", region1, region2, mode);
 350
 351     if(!(region1 && region2))
 352         return InvalidParameter;
 353
 354     /* simply replace region data */
 355     if(mode == CombineModeReplace){
 356         stat = GdipCloneRegion(region2, &reg2copy);
 357         if(stat != Ok)  return stat;
 358
 359         delete_element(&region1->node);
 360         memcpy(region1, reg2copy, sizeof(GpRegion));
 361         GdipFree(reg2copy);
 362         return Ok;
 363     }
 364
 365     left  = GdipAlloc(sizeof(region_element));
 366     if (!left)
 367         return OutOfMemory;
 368
 369     *left = region1->node;
 370     stat = clone_element(&region2->node, &right);
 371     if (stat != Ok)
 372     {
 373         GdipFree(left);
 374         return OutOfMemory;
 375     }
 376
 377     fuse_region(region1, left, right, mode);
 378     region1->header.num_children += region2->header.num_children;
 379
 380     return Ok;
 381 }
 382
 383 /*****************************************************************************
 384  * GdipCreateRegion [GDIPLUS.@]
 385  */
 386 GpStatus WINGDIPAPI GdipCreateRegion(GpRegion **region)
 387 {
 388     TRACE("%p\n", region);
 389
 390     if(!region)
 391         return InvalidParameter;
 392
 393     *region = GdipAlloc(sizeof(GpRegion));
 394     if(!*region)
 395         return OutOfMemory;
 396
 397     return init_region(*region, RegionDataInfiniteRect);
 398 }
 399
 400 /*****************************************************************************
 401  * GdipCreateRegionPath [GDIPLUS.@]
 402  *
 403  * Creates a GpRegion from a GpPath
 404  *
 405  * PARAMS
 406  *  path    [I] path to base the region on
 407  *  region  [O] pointer to the newly allocated region
 408  *
 409  * RETURNS
 410  *  SUCCESS: Ok
 411  *  FAILURE: InvalidParameter
 412  *
 413  * NOTES
 414  *  If a path has no floating point points, its points will be stored as shorts
 415  *  (INTPATH)
 416  *
 417  *  If a path is empty, it is considered to be an INTPATH
 418  */
 419 GpStatus WINGDIPAPI GdipCreateRegionPath(GpPath *path, GpRegion **region)
 420 {
 421     region_element* element;
 422     GpPoint  *pointsi;
 423     GpPointF *pointsf;
 424
 425     GpStatus stat;
 426     DWORD flags = FLAGS_INTPATH;
 427     INT count, i;
 428
 429     TRACE("%p, %p\n", path, region);
 430
 431     if (!(path && region))
 432         return InvalidParameter;
 433
 434     *region = GdipAlloc(sizeof(GpRegion));
 435     if(!*region)
 436         return OutOfMemory;
 437     stat = init_region(*region, RegionDataPath);
 438     if (stat != Ok)
 439     {
 440         GdipDeleteRegion(*region);
 441         return stat;
 442     }
 443     element = &(*region)->node;
 444     count = path->pathdata.Count;
 445
 446     /* Test to see if the path is an Integer path */
 447     if (count)
 448     {
 449         pointsi = GdipAlloc(sizeof(GpPoint) * count);
 450         pointsf = GdipAlloc(sizeof(GpPointF) * count);
 451         if (!(pointsi && pointsf))
 452         {
 453             GdipFree(pointsi);
 454             GdipFree(pointsf);
 455             GdipDeleteRegion(*region);
 456             return OutOfMemory;
 457         }
 458
 459         stat = GdipGetPathPointsI(path, pointsi, count);
 460         if (stat != Ok)
 461         {
 462             GdipDeleteRegion(*region);
 463             return stat;
 464         }
 465         stat = GdipGetPathPoints(path, pointsf, count);
 466         if (stat != Ok)
 467         {
 468             GdipDeleteRegion(*region);
 469             return stat;
 470         }
 471
 472         for (i = 0; i < count; i++)
 473         {
 474             if (!(pointsi[i].X == pointsf[i].X &&
 475                   pointsi[i].Y == pointsf[i].Y ))
 476             {
 477                 flags = FLAGS_NOFLAGS;
 478                 break;
 479             }
 480         }
 481         GdipFree(pointsi);
 482         GdipFree(pointsf);
 483     }
 484
 485     stat = GdipClonePath(path, &element->elementdata.pathdata.path);
 486     if (stat != Ok)
 487     {
 488         GdipDeleteRegion(*region);
 489         return stat;
 490     }
 491
 492     /* 3 for headers, once again size doesn't count itself */
 493     element->elementdata.pathdata.pathheader.size = ((sizeof(DWORD) * 3));
 494     switch(flags)
 495     {
 496         /* Floats, sent out as floats */
 497         case FLAGS_NOFLAGS:
 498             element->elementdata.pathdata.pathheader.size +=
 499                 (sizeof(DWORD) * count * 2);
 500             break;
 501         /* INTs, sent out as packed shorts */
 502         case FLAGS_INTPATH:
 503             element->elementdata.pathdata.pathheader.size +=
 504                 (sizeof(DWORD) * count);
 505             break;
 506         default:
 507             FIXME("Unhandled flags (%08x). Expect wrong results.\n", flags);
 508     }
 509     element->elementdata.pathdata.pathheader.size += get_pathtypes_size(path);
 510     element->elementdata.pathdata.pathheader.magic = VERSION_MAGIC;
 511     element->elementdata.pathdata.pathheader.count = count;
 512     element->elementdata.pathdata.pathheader.flags = flags;
 513     (*region)->header.size = sizeheader_size + get_element_size(element);
 514
 515     return Ok;
 516 }
 517
 518 /*****************************************************************************
 519  * GdipCreateRegionRect [GDIPLUS.@]
 520  */
 521 GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect,
 522         GpRegion **region)
 523 {
 524     GpStatus stat;
 525
 526     TRACE("%p, %p\n", rect, region);
 527
 528     if (!(rect && region))
 529         return InvalidParameter;
 530
 531     *region = GdipAlloc(sizeof(GpRegion));
 532     stat = init_region(*region, RegionDataRect);
 533     if(stat != Ok)
 534     {
 535         GdipDeleteRegion(*region);
 536         return stat;
 537     }
 538
 539     (*region)->node.elementdata.rect.X = rect->X;
 540     (*region)->node.elementdata.rect.Y = rect->Y;
 541     (*region)->node.elementdata.rect.Width = rect->Width;
 542     (*region)->node.elementdata.rect.Height = rect->Height;
 543
 544     return Ok;
 545 }
 546
 547 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
 548         GpRegion **region)
 549 {
 550     GpRectF rectf;
 551
 552     TRACE("%p, %p\n", rect, region);
 553
 554     rectf.X = (REAL)rect->X;
 555     rectf.Y = (REAL)rect->Y;
 556     rectf.Width = (REAL)rect->Width;
 557     rectf.Height = (REAL)rect->Height;
 558
 559     return GdipCreateRegionRect(&rectf, region);
 560 }
 561
 562 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 563 {
 564     FIXME("(%p, %d, %p): stub\n", data, size, region);
 565
 566     *region = NULL;
 567     return NotImplemented;
 568 }
 569
 570
 571 /******************************************************************************
 572  * GdipCreateRegionHrgn [GDIPLUS.@]
 573  */
 574 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 575 {
 576     union {
 577         RGNDATA data;
 578         char buf[sizeof(RGNDATAHEADER) + sizeof(RECT)];
 579     } rdata;
 580     DWORD size;
 581     GpRectF rectf;
 582     GpPath *path;
 583     GpStatus stat;
 584
 585     TRACE("(%p, %p)\n", hrgn, region);
 586
 587     if(!region || !(size = GetRegionData(hrgn, 0, NULL)))
 588         return InvalidParameter;
 589
 590     if(size > sizeof(RGNDATAHEADER) + sizeof(RECT)){
 591         FIXME("Only simple rect regions supported.\n");
 592         *region = NULL;
 593         return NotImplemented;
 594     }
 595
 596     if(!GetRegionData(hrgn, sizeof(rdata), &rdata.data))
 597         return GenericError;
 598
 599     /* return empty region */
 600     if(IsRectEmpty(&rdata.data.rdh.rcBound)){
 601         stat = GdipCreateRegion(region);
 602         if(stat == Ok)
 603             GdipSetEmpty(*region);
 604         return stat;
 605     }
 606
 607     rectf.X = (REAL)rdata.data.rdh.rcBound.left;
 608     rectf.Y = (REAL)rdata.data.rdh.rcBound.top;
 609     rectf.Width  = (REAL)rdata.data.rdh.rcBound.right - rectf.X;
 610     rectf.Height = (REAL)rdata.data.rdh.rcBound.bottom - rectf.Y;
 611
 612     stat = GdipCreatePath(FillModeAlternate, &path);
 613     if(stat != Ok)
 614         return stat;
 615
 616     GdipAddPathRectangle(path, rectf.X, rectf.Y, rectf.Width, rectf.Height);
 617
 618     stat = GdipCreateRegionPath(path, region);
 619     GdipDeletePath(path);
 620
 621     return stat;
 622 }
 623
 624 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 625 {
 626     TRACE("%p\n", region);
 627
 628     if (!region)
 629         return InvalidParameter;
 630
 631     delete_element(&region->node);
 632     GdipFree(region);
 633
 634     return Ok;
 635 }
 636
 637 /*****************************************************************************
 638  * GdipGetRegionBounds [GDIPLUS.@]
 639  */
 640 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 641 {
 642     HRGN hrgn;
 643     RECT r;
 644     GpStatus status;
 645
 646     TRACE("(%p, %p, %p)\n", region, graphics, rect);
 647
 648     if(!region || !graphics || !rect)
 649         return InvalidParameter;
 650
 651     status = GdipGetRegionHRgn(region, graphics, &hrgn);
 652     if(status != Ok)
 653         return status;
 654
 655     /* infinite */
 656     if(!hrgn){
 657         rect->X = rect->Y = -(REAL)(1 << 22);
 658         rect->Width = rect->Height = (REAL)(1 << 23);
 659         return Ok;
 660     }
 661
 662     if(!GetRgnBox(hrgn, &r)){
 663         DeleteObject(hrgn);
 664         return GenericError;
 665     }
 666
 667     rect->X = r.left;
 668     rect->Y = r.top;
 669     rect->Width  = r.right  - r.left;
 670     rect->Height = r.bottom - r.top;
 671
 672     return Ok;
 673 }
 674
 675 /*****************************************************************************
 676  * GdipGetRegionBoundsI [GDIPLUS.@]
 677  */
 678 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 679 {
 680     GpRectF rectf;
 681     GpStatus status;
 682
 683     TRACE("(%p, %p, %p)\n", region, graphics, rect);
 684
 685     if(!rect)
 686         return InvalidParameter;
 687
 688     status = GdipGetRegionBounds(region, graphics, &rectf);
 689     if(status == Ok){
 690         rect->X = roundr(rectf.X);
 691         rect->Y = roundr(rectf.X);
 692         rect->Width  = roundr(rectf.Width);
 693         rect->Height = roundr(rectf.Height);
 694     }
 695
 696     return status;
 697 }
 698
 699 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 700 {
 701     location[*offset] = write;
 702     (*offset)++;
 703 }
 704
 705 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 706 {
 707     ((FLOAT*)location)[*offset] = write;
 708     (*offset)++;
 709 }
 710
 711 static inline void write_packed_point(DWORD* location, INT* offset,
 712         const GpPointF* write)
 713 {
 714     packed_point point;
 715
 716     point.X = write->X;
 717     point.Y = write->Y;
 718     memcpy(location + *offset, &point, sizeof(packed_point));
 719     (*offset)++;
 720 }
 721
 722 static inline void write_path_types(DWORD* location, INT* offset,
 723         const GpPath* path)
 724 {
 725     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 726
 727     /* The unwritten parts of the DWORD (if any) must be cleared */
 728     if (path->pathdata.Count % sizeof(DWORD))
 729         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 730                 path->pathdata.Count,
 731                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 732     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 733 }
 734
 735 static void write_element(const region_element* element, DWORD *buffer,
 736         INT* filled)
 737 {
 738     write_dword(buffer, filled, element->type);
 739     switch (element->type)
 740     {
 741         case CombineModeReplace:
 742         case CombineModeIntersect:
 743         case CombineModeUnion:
 744         case CombineModeXor:
 745         case CombineModeExclude:
 746         case CombineModeComplement:
 747             write_element(element->elementdata.combine.left, buffer, filled);
 748             write_element(element->elementdata.combine.right, buffer, filled);
 749             break;
 750         case RegionDataRect:
 751             write_float(buffer, filled, element->elementdata.rect.X);
 752             write_float(buffer, filled, element->elementdata.rect.Y);
 753             write_float(buffer, filled, element->elementdata.rect.Width);
 754             write_float(buffer, filled, element->elementdata.rect.Height);
 755             break;
 756         case RegionDataPath:
 757         {
 758             INT i;
 759             const GpPath* path = element->elementdata.pathdata.path;
 760
 761             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 762                     sizeof(element->elementdata.pathdata.pathheader));
 763             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 764             switch (element->elementdata.pathdata.pathheader.flags)
 765             {
 766                 case FLAGS_NOFLAGS:
 767                     for (i = 0; i < path->pathdata.Count; i++)
 768                     {
 769                         write_float(buffer, filled, path->pathdata.Points[i].X);
 770                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 771                     }
 772                     break;
 773                 case FLAGS_INTPATH:
 774                     for (i = 0; i < path->pathdata.Count; i++)
 775                     {
 776                         write_packed_point(buffer, filled,
 777                                 &path->pathdata.Points[i]);
 778                     }
 779             }
 780             write_path_types(buffer, filled, path);
 781             break;
 782         }
 783         case RegionDataEmptyRect:
 784         case RegionDataInfiniteRect:
 785             break;
 786     }
 787 }
 788
 789 /*****************************************************************************
 790  * GdipGetRegionData [GDIPLUS.@]
 791  *
 792  * Returns the header, followed by combining ops and region elements.
 793  *
 794  * PARAMS
 795  *  region  [I] region to retrieve from
 796  *  buffer  [O] buffer to hold the resulting data
 797  *  size    [I] size of the buffer
 798  *  needed  [O] (optional) how much data was written
 799  *
 800  * RETURNS
 801  *  SUCCESS: Ok
 802  *  FAILURE: InvalidParamter
 803  *
 804  * NOTES
 805  *  The header contains the size, a checksum, a version string, and the number
 806  *  of children. The size does not count itself or the checksum.
 807  *  Version is always something like 0xdbc01001 or 0xdbc01002
 808  *
 809  *  An element is a RECT, or PATH; Combining ops are stored as their
 810  *  CombineMode value. Special regions (infinite, empty) emit just their
 811  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 812  *  their code followed by a second header for the path followed by the actual
 813  *  path data. Followed by the flags for each point. The pathheader contains
 814  *  the size of the data to follow, a version number again, followed by a count
 815  *  of how many points, and any special flags which may apply. 0x4000 means its
 816  *  a path of shorts instead of FLOAT.
 817  *
 818  *  Combining Ops are stored in reverse order from when they were constructed;
 819  *  the output is a tree where the left side combining area is always taken
 820  *  first.
 821  */
 822 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 823         UINT *needed)
 824 {
 825     INT filled = 0;
 826
 827     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 828
 829     if (!(region && buffer && size))
 830         return InvalidParameter;
 831
 832     memcpy(buffer, &region->header, sizeof(region->header));
 833     filled += sizeof(region->header) / sizeof(DWORD);
 834     /* With few exceptions, everything written is DWORD aligned,
 835      * so use that as our base */
 836     write_element(&region->node, (DWORD*)buffer, &filled);
 837
 838     if (needed)
 839         *needed = filled * sizeof(DWORD);
 840
 841     return Ok;
 842 }
 843
 844 /*****************************************************************************
 845  * GdipGetRegionDataSize [GDIPLUS.@]
 846  */
 847 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 848 {
 849     TRACE("%p, %p\n", region, needed);
 850
 851     if (!(region && needed))
 852         return InvalidParameter;
 853
 854     /* header.size doesn't count header.size and header.checksum */
 855     *needed = region->header.size + sizeof(DWORD) * 2;
 856
 857     return Ok;
 858 }
 859
 860 static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
 861 {
 862     HDC new_hdc=NULL;
 863     GpStatus stat;
 864     INT save_state;
 865
 866     if (!graphics)
 867     {
 868         new_hdc = GetDC(0);
 869         if (!new_hdc)
 870             return OutOfMemory;
 871
 872         stat = GdipCreateFromHDC(new_hdc, &graphics);
 873         if (stat != Ok)
 874         {
 875             ReleaseDC(0, new_hdc);
 876             return stat;
 877         }
 878     }
 879
 880     save_state = SaveDC(graphics->hdc);
 881     EndPath(graphics->hdc);
 882
 883     SetPolyFillMode(graphics->hdc, (path->fill == FillModeAlternate ? ALTERNATE
 884                                                                     : WINDING));
 885
 886     stat = trace_path(graphics, path);
 887     if (stat == Ok)
 888     {
 889         *hrgn = PathToRegion(graphics->hdc);
 890         stat = *hrgn ? Ok : OutOfMemory;
 891     }
 892
 893     RestoreDC(graphics->hdc, save_state);
 894     if (new_hdc)
 895     {
 896         ReleaseDC(0, new_hdc);
 897         GdipDeleteGraphics(graphics);
 898     }
 899
 900     return stat;
 901 }
 902
 903 static GpStatus get_region_hrgn(struct region_element *element, GpGraphics *graphics, HRGN *hrgn)
 904 {
 905     switch (element->type)
 906     {
 907         case RegionDataInfiniteRect:
 908             *hrgn = NULL;
 909             return Ok;
 910         case RegionDataEmptyRect:
 911             *hrgn = CreateRectRgn(0, 0, 0, 0);
 912             return *hrgn ? Ok : OutOfMemory;
 913         case RegionDataPath:
 914             return get_path_hrgn(element->elementdata.pathdata.path, graphics, hrgn);
 915         case RegionDataRect:
 916         {
 917             GpPath* path;
 918             GpStatus stat;
 919             GpRectF* rc = &element->elementdata.rect;
 920
 921             stat = GdipCreatePath(FillModeAlternate, &path);
 922             if (stat != Ok)
 923                 return stat;
 924             stat = GdipAddPathRectangle(path, rc->X, rc->Y, rc->Width, rc->Height);
 925
 926             if (stat == Ok)
 927                 stat = get_path_hrgn(path, graphics, hrgn);
 928
 929             GdipDeletePath(path);
 930
 931             return stat;
 932         }
 933         case CombineModeIntersect:
 934         case CombineModeUnion:
 935         case CombineModeXor:
 936         case CombineModeExclude:
 937         case CombineModeComplement:
 938         {
 939             HRGN left, right;
 940             GpStatus stat;
 941             int ret;
 942
 943             stat = get_region_hrgn(element->elementdata.combine.left, graphics, &left);
 944             if (stat != Ok)
 945             {
 946                 *hrgn = NULL;
 947                 return stat;
 948             }
 949
 950             if (left == NULL)
 951             {
 952                 /* existing region is infinite */
 953                 switch (element->type)
 954                 {
 955                     case CombineModeIntersect:
 956                         return get_region_hrgn(element->elementdata.combine.right, graphics, hrgn);
 957                     case CombineModeXor: case CombineModeExclude:
 958                         FIXME("cannot exclude from an infinite region\n");
 959                         /* fall-through */
 960                     case CombineModeUnion: case CombineModeComplement:
 961                         *hrgn = NULL;
 962                         return Ok;
 963                 }
 964             }
 965
 966             stat = get_region_hrgn(element->elementdata.combine.right, graphics, &right);
 967             if (stat != Ok)
 968             {
 969                 DeleteObject(left);
 970                 *hrgn = NULL;
 971                 return stat;
 972             }
 973
 974             if (right == NULL)
 975             {
 976                 /* new region is infinite */
 977                 switch (element->type)
 978                 {
 979                     case CombineModeIntersect:
 980                         *hrgn = left;
 981                         return Ok;
 982                     case CombineModeXor: case CombineModeComplement:
 983                         FIXME("cannot exclude from an infinite region\n");
 984                         /* fall-through */
 985                     case CombineModeUnion: case CombineModeExclude:
 986                         DeleteObject(left);
 987                         *hrgn = NULL;
 988                         return Ok;
 989                 }
 990             }
 991
 992             switch (element->type)
 993             {
 994                 case CombineModeIntersect:
 995                     ret = CombineRgn(left, left, right, RGN_AND);
 996                     break;
 997                 case CombineModeUnion:
 998                     ret = CombineRgn(left, left, right, RGN_OR);
 999                     break;
1000                 case CombineModeXor:
1001                     ret = CombineRgn(left, left, right, RGN_XOR);
1002                     break;
1003                 case CombineModeExclude:
1004                     ret = CombineRgn(left, left, right, RGN_DIFF);
1005                     break;
1006                 case CombineModeComplement:
1007                     ret = CombineRgn(left, right, left, RGN_DIFF);
1008                     break;
1009                 default:
1010                     ret = ERROR;
1011             }
1012
1013             DeleteObject(right);
1014
1015             if (ret == ERROR)
1016             {
1017                 DeleteObject(left);
1018                 *hrgn = NULL;
1019                 return GenericError;
1020             }
1021
1022             *hrgn = left;
1023             return Ok;
1024         }
1025         default:
1026             FIXME("GdipGetRegionHRgn unimplemented for region type=%x\n", element->type);
1027             *hrgn = NULL;
1028             return NotImplemented;
1029     }
1030 }
1031
1032 /*****************************************************************************
1033  * GdipGetRegionHRgn [GDIPLUS.@]
1034  */
1035 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
1036 {
1037     TRACE("(%p, %p, %p)\n", region, graphics, hrgn);
1038
1039     if (!region || !hrgn)
1040         return InvalidParameter;
1041
1042     return get_region_hrgn(&region->node, graphics, hrgn);
1043 }
1044
1045 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1046 {
1047     TRACE("(%p, %p, %p)\n", region, graphics, res);
1048
1049     if(!region || !graphics || !res)
1050         return InvalidParameter;
1051
1052     *res = (region->node.type == RegionDataEmptyRect);
1053
1054     return Ok;
1055 }
1056
1057 /*****************************************************************************
1058  * GdipIsEqualRegion [GDIPLUS.@]
1059  */
1060 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
1061                                       BOOL *res)
1062 {
1063     HRGN hrgn1, hrgn2;
1064     GpStatus stat;
1065
1066     TRACE("(%p, %p, %p, %p)\n", region, region2, graphics, res);
1067
1068     if(!region || !region2 || !graphics || !res)
1069         return InvalidParameter;
1070
1071     stat = GdipGetRegionHRgn(region, graphics, &hrgn1);
1072     if(stat != Ok)
1073         return stat;
1074     stat = GdipGetRegionHRgn(region2, graphics, &hrgn2);
1075     if(stat != Ok){
1076         DeleteObject(hrgn1);
1077         return stat;
1078     }
1079
1080     *res = EqualRgn(hrgn1, hrgn2);
1081
1082     /* one of GpRegions is infinite */
1083     if(*res == ERROR)
1084         *res = (!hrgn1 && !hrgn2);
1085
1086     DeleteObject(hrgn1);
1087     DeleteObject(hrgn2);
1088
1089     return Ok;
1090 }
1091
1092 /*****************************************************************************
1093  * GdipIsInfiniteRegion [GDIPLUS.@]
1094  */
1095 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1096 {
1097     /* I think graphics is ignored here */
1098     TRACE("(%p, %p, %p)\n", region, graphics, res);
1099
1100     if(!region || !graphics || !res)
1101         return InvalidParameter;
1102
1103     *res = (region->node.type == RegionDataInfiniteRect);
1104
1105     return Ok;
1106 }
1107
1108 /*****************************************************************************
1109  * GdipSetEmpty [GDIPLUS.@]
1110  */
1111 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
1112 {
1113     GpStatus stat;
1114
1115     TRACE("%p\n", region);
1116
1117     if (!region)
1118         return InvalidParameter;
1119
1120     delete_element(&region->node);
1121     stat = init_region(region, RegionDataEmptyRect);
1122
1123     return stat;
1124 }
1125
1126 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
1127 {
1128     GpStatus stat;
1129
1130     TRACE("%p\n", region);
1131
1132     if (!region)
1133         return InvalidParameter;
1134
1135     delete_element(&region->node);
1136     stat = init_region(region, RegionDataInfiniteRect);
1137
1138     return stat;
1139 }
1140
1141 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
1142 {
1143     FIXME("(%p, %p): stub\n", region, matrix);
1144
1145     return NotImplemented;
1146 }
1147
1148 /* Translates GpRegion elements with specified offsets */
1149 static void translate_region_element(region_element* element, REAL dx, REAL dy)
1150 {
1151     INT i;
1152
1153     switch(element->type)
1154     {
1155         case RegionDataEmptyRect:
1156         case RegionDataInfiniteRect:
1157             return;
1158         case RegionDataRect:
1159             element->elementdata.rect.X += dx;
1160             element->elementdata.rect.Y += dy;
1161             return;
1162         case RegionDataPath:
1163             for(i = 0; i < element->elementdata.pathdata.path->pathdata.Count; i++){
1164                 element->elementdata.pathdata.path->pathdata.Points[i].X += dx;
1165                 element->elementdata.pathdata.path->pathdata.Points[i].Y += dy;
1166             }
1167             return;
1168         default:
1169             translate_region_element(element->elementdata.combine.left,  dx, dy);
1170             translate_region_element(element->elementdata.combine.right, dx, dy);
1171             return;
1172     }
1173 }
1174
1175 /*****************************************************************************
1176  * GdipTranslateRegion [GDIPLUS.@]
1177  */
1178 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
1179 {
1180     TRACE("(%p, %f, %f)\n", region, dx, dy);
1181
1182     if(!region)
1183         return InvalidParameter;
1184
1185     translate_region_element(&region->node, dx, dy);
1186
1187     return Ok;
1188 }
1189
1190 /*****************************************************************************
1191  * GdipTranslateRegionI [GDIPLUS.@]
1192  */
1193 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
1194 {
1195     TRACE("(%p, %d, %d)\n", region, dx, dy);
1196
1197     return GdipTranslateRegion(region, (REAL)dx, (REAL)dy);
1198 }