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 /*****************************************************************************
 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 /*****************************************************************************
 343  * GdipCombineRegionRegion [GDIPLUS.@]
 344  */
 345 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
 346         GpRegion *region2, CombineMode mode)
 347 {
 348     region_element *left, *right = NULL;
 349     GpStatus stat;
 350     GpRegion *reg2copy;
 351
 352     TRACE("%p %p %d\n", region1, region2, mode);
 353
 354     if(!(region1 && region2))
 355         return InvalidParameter;
 356
 357     /* simply replace region data */
 358     if(mode == CombineModeReplace){
 359         stat = GdipCloneRegion(region2, &reg2copy);
 360         if(stat != Ok)  return stat;
 361
 362         delete_element(&region1->node);
 363         memcpy(region1, reg2copy, sizeof(GpRegion));
 364         GdipFree(reg2copy);
 365         return Ok;
 366     }
 367
 368     left  = GdipAlloc(sizeof(region_element));
 369     if (!left)
 370         return OutOfMemory;
 371
 372     *left = region1->node;
 373     stat = clone_element(&region2->node, &right);
 374     if (stat != Ok)
 375     {
 376         GdipFree(left);
 377         return OutOfMemory;
 378     }
 379
 380     fuse_region(region1, left, right, mode);
 381     region1->header.num_children += region2->header.num_children;
 382
 383     return Ok;
 384 }
 385
 386 /*****************************************************************************
 387  * GdipCreateRegion [GDIPLUS.@]
 388  */
 389 GpStatus WINGDIPAPI GdipCreateRegion(GpRegion **region)
 390 {
 391     TRACE("%p\n", region);
 392
 393     if(!region)
 394         return InvalidParameter;
 395
 396     *region = GdipAlloc(sizeof(GpRegion));
 397     if(!*region)
 398         return OutOfMemory;
 399
 400     return init_region(*region, RegionDataInfiniteRect);
 401 }
 402
 403 /*****************************************************************************
 404  * GdipCreateRegionPath [GDIPLUS.@]
 405  *
 406  * Creates a GpRegion from a GpPath
 407  *
 408  * PARAMS
 409  *  path    [I] path to base the region on
 410  *  region  [O] pointer to the newly allocated region
 411  *
 412  * RETURNS
 413  *  SUCCESS: Ok
 414  *  FAILURE: InvalidParameter
 415  *
 416  * NOTES
 417  *  If a path has no floating point points, its points will be stored as shorts
 418  *  (INTPATH)
 419  *
 420  *  If a path is empty, it is considered to be an INTPATH
 421  */
 422 GpStatus WINGDIPAPI GdipCreateRegionPath(GpPath *path, GpRegion **region)
 423 {
 424     region_element* element;
 425     GpPoint  *pointsi;
 426     GpPointF *pointsf;
 427
 428     GpStatus stat;
 429     DWORD flags = FLAGS_INTPATH;
 430     INT count, i;
 431
 432     TRACE("%p, %p\n", path, region);
 433
 434     if (!(path && region))
 435         return InvalidParameter;
 436
 437     *region = GdipAlloc(sizeof(GpRegion));
 438     if(!*region)
 439         return OutOfMemory;
 440     stat = init_region(*region, RegionDataPath);
 441     if (stat != Ok)
 442     {
 443         GdipDeleteRegion(*region);
 444         return stat;
 445     }
 446     element = &(*region)->node;
 447     count = path->pathdata.Count;
 448
 449     /* Test to see if the path is an Integer path */
 450     if (count)
 451     {
 452         pointsi = GdipAlloc(sizeof(GpPoint) * count);
 453         pointsf = GdipAlloc(sizeof(GpPointF) * count);
 454         if (!(pointsi && pointsf))
 455         {
 456             GdipFree(pointsi);
 457             GdipFree(pointsf);
 458             GdipDeleteRegion(*region);
 459             return OutOfMemory;
 460         }
 461
 462         stat = GdipGetPathPointsI(path, pointsi, count);
 463         if (stat != Ok)
 464         {
 465             GdipDeleteRegion(*region);
 466             return stat;
 467         }
 468         stat = GdipGetPathPoints(path, pointsf, count);
 469         if (stat != Ok)
 470         {
 471             GdipDeleteRegion(*region);
 472             return stat;
 473         }
 474
 475         for (i = 0; i < count; i++)
 476         {
 477             if (!(pointsi[i].X == pointsf[i].X &&
 478                   pointsi[i].Y == pointsf[i].Y ))
 479             {
 480                 flags = FLAGS_NOFLAGS;
 481                 break;
 482             }
 483         }
 484         GdipFree(pointsi);
 485         GdipFree(pointsf);
 486     }
 487
 488     stat = GdipClonePath(path, &element->elementdata.pathdata.path);
 489     if (stat != Ok)
 490     {
 491         GdipDeleteRegion(*region);
 492         return stat;
 493     }
 494
 495     /* 3 for headers, once again size doesn't count itself */
 496     element->elementdata.pathdata.pathheader.size = ((sizeof(DWORD) * 3));
 497     switch(flags)
 498     {
 499         /* Floats, sent out as floats */
 500         case FLAGS_NOFLAGS:
 501             element->elementdata.pathdata.pathheader.size +=
 502                 (sizeof(DWORD) * count * 2);
 503             break;
 504         /* INTs, sent out as packed shorts */
 505         case FLAGS_INTPATH:
 506             element->elementdata.pathdata.pathheader.size +=
 507                 (sizeof(DWORD) * count);
 508             break;
 509         default:
 510             FIXME("Unhandled flags (%08x). Expect wrong results.\n", flags);
 511     }
 512     element->elementdata.pathdata.pathheader.size += get_pathtypes_size(path);
 513     element->elementdata.pathdata.pathheader.magic = VERSION_MAGIC;
 514     element->elementdata.pathdata.pathheader.count = count;
 515     element->elementdata.pathdata.pathheader.flags = flags;
 516     (*region)->header.size = sizeheader_size + get_element_size(element);
 517
 518     return Ok;
 519 }
 520
 521 /*****************************************************************************
 522  * GdipCreateRegionRect [GDIPLUS.@]
 523  */
 524 GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect,
 525         GpRegion **region)
 526 {
 527     GpStatus stat;
 528
 529     TRACE("%p, %p\n", rect, region);
 530
 531     if (!(rect && region))
 532         return InvalidParameter;
 533
 534     *region = GdipAlloc(sizeof(GpRegion));
 535     stat = init_region(*region, RegionDataRect);
 536     if(stat != Ok)
 537     {
 538         GdipDeleteRegion(*region);
 539         return stat;
 540     }
 541
 542     (*region)->node.elementdata.rect.X = rect->X;
 543     (*region)->node.elementdata.rect.Y = rect->Y;
 544     (*region)->node.elementdata.rect.Width = rect->Width;
 545     (*region)->node.elementdata.rect.Height = rect->Height;
 546
 547     return Ok;
 548 }
 549
 550 /*****************************************************************************
 551  * GdipCreateRegionRectI [GDIPLUS.@]
 552  */
 553 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
 554         GpRegion **region)
 555 {
 556     GpRectF rectf;
 557
 558     TRACE("%p, %p\n", rect, region);
 559
 560     rectf.X = (REAL)rect->X;
 561     rectf.Y = (REAL)rect->Y;
 562     rectf.Width = (REAL)rect->Width;
 563     rectf.Height = (REAL)rect->Height;
 564
 565     return GdipCreateRegionRect(&rectf, region);
 566 }
 567
 568 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 569 {
 570     FIXME("(%p, %d, %p): stub\n", data, size, region);
 571
 572     *region = NULL;
 573     return NotImplemented;
 574 }
 575
 576
 577 /******************************************************************************
 578  * GdipCreateRegionHrgn [GDIPLUS.@]
 579  */
 580 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 581 {
 582     union {
 583         RGNDATA data;
 584         char buf[sizeof(RGNDATAHEADER) + sizeof(RECT)];
 585     } rdata;
 586     DWORD size;
 587     GpRectF rectf;
 588     GpPath *path;
 589     GpStatus stat;
 590
 591     TRACE("(%p, %p)\n", hrgn, region);
 592
 593     if(!region || !(size = GetRegionData(hrgn, 0, NULL)))
 594         return InvalidParameter;
 595
 596     if(size > sizeof(RGNDATAHEADER) + sizeof(RECT)){
 597         FIXME("Only simple rect regions supported.\n");
 598         *region = NULL;
 599         return NotImplemented;
 600     }
 601
 602     if(!GetRegionData(hrgn, sizeof(rdata), &rdata.data))
 603         return GenericError;
 604
 605     /* return empty region */
 606     if(IsRectEmpty(&rdata.data.rdh.rcBound)){
 607         stat = GdipCreateRegion(region);
 608         if(stat == Ok)
 609             GdipSetEmpty(*region);
 610         return stat;
 611     }
 612
 613     rectf.X = (REAL)rdata.data.rdh.rcBound.left;
 614     rectf.Y = (REAL)rdata.data.rdh.rcBound.top;
 615     rectf.Width  = (REAL)rdata.data.rdh.rcBound.right - rectf.X;
 616     rectf.Height = (REAL)rdata.data.rdh.rcBound.bottom - rectf.Y;
 617
 618     stat = GdipCreatePath(FillModeAlternate, &path);
 619     if(stat != Ok)
 620         return stat;
 621
 622     GdipAddPathRectangle(path, rectf.X, rectf.Y, rectf.Width, rectf.Height);
 623
 624     stat = GdipCreateRegionPath(path, region);
 625     GdipDeletePath(path);
 626
 627     return stat;
 628 }
 629
 630 /*****************************************************************************
 631  * GdipDeleteRegion [GDIPLUS.@]
 632  */
 633 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 634 {
 635     TRACE("%p\n", region);
 636
 637     if (!region)
 638         return InvalidParameter;
 639
 640     delete_element(&region->node);
 641     GdipFree(region);
 642
 643     return Ok;
 644 }
 645
 646 /*****************************************************************************
 647  * GdipGetRegionBounds [GDIPLUS.@]
 648  */
 649 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 650 {
 651     HRGN hrgn;
 652     RECT r;
 653     GpStatus status;
 654
 655     TRACE("(%p, %p, %p)\n", region, graphics, rect);
 656
 657     if(!region || !graphics || !rect)
 658         return InvalidParameter;
 659
 660     /* Contrary to MSDN, native ignores the graphics transform. */
 661     status = GdipGetRegionHRgn(region, NULL, &hrgn);
 662     if(status != Ok)
 663         return status;
 664
 665     /* infinite */
 666     if(!hrgn){
 667         rect->X = rect->Y = -(REAL)(1 << 22);
 668         rect->Width = rect->Height = (REAL)(1 << 23);
 669         return Ok;
 670     }
 671
 672     if(!GetRgnBox(hrgn, &r)){
 673         DeleteObject(hrgn);
 674         return GenericError;
 675     }
 676
 677     rect->X = r.left;
 678     rect->Y = r.top;
 679     rect->Width  = r.right  - r.left;
 680     rect->Height = r.bottom - r.top;
 681
 682     return Ok;
 683 }
 684
 685 /*****************************************************************************
 686  * GdipGetRegionBoundsI [GDIPLUS.@]
 687  */
 688 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 689 {
 690     GpRectF rectf;
 691     GpStatus status;
 692
 693     TRACE("(%p, %p, %p)\n", region, graphics, rect);
 694
 695     if(!rect)
 696         return InvalidParameter;
 697
 698     status = GdipGetRegionBounds(region, graphics, &rectf);
 699     if(status == Ok){
 700         rect->X = roundr(rectf.X);
 701         rect->Y = roundr(rectf.X);
 702         rect->Width  = roundr(rectf.Width);
 703         rect->Height = roundr(rectf.Height);
 704     }
 705
 706     return status;
 707 }
 708
 709 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 710 {
 711     location[*offset] = write;
 712     (*offset)++;
 713 }
 714
 715 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 716 {
 717     ((FLOAT*)location)[*offset] = write;
 718     (*offset)++;
 719 }
 720
 721 static inline void write_packed_point(DWORD* location, INT* offset,
 722         const GpPointF* write)
 723 {
 724     packed_point point;
 725
 726     point.X = write->X;
 727     point.Y = write->Y;
 728     memcpy(location + *offset, &point, sizeof(packed_point));
 729     (*offset)++;
 730 }
 731
 732 static inline void write_path_types(DWORD* location, INT* offset,
 733         const GpPath* path)
 734 {
 735     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 736
 737     /* The unwritten parts of the DWORD (if any) must be cleared */
 738     if (path->pathdata.Count % sizeof(DWORD))
 739         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 740                 path->pathdata.Count,
 741                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 742     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 743 }
 744
 745 static void write_element(const region_element* element, DWORD *buffer,
 746         INT* filled)
 747 {
 748     write_dword(buffer, filled, element->type);
 749     switch (element->type)
 750     {
 751         case CombineModeReplace:
 752         case CombineModeIntersect:
 753         case CombineModeUnion:
 754         case CombineModeXor:
 755         case CombineModeExclude:
 756         case CombineModeComplement:
 757             write_element(element->elementdata.combine.left, buffer, filled);
 758             write_element(element->elementdata.combine.right, buffer, filled);
 759             break;
 760         case RegionDataRect:
 761             write_float(buffer, filled, element->elementdata.rect.X);
 762             write_float(buffer, filled, element->elementdata.rect.Y);
 763             write_float(buffer, filled, element->elementdata.rect.Width);
 764             write_float(buffer, filled, element->elementdata.rect.Height);
 765             break;
 766         case RegionDataPath:
 767         {
 768             INT i;
 769             const GpPath* path = element->elementdata.pathdata.path;
 770
 771             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 772                     sizeof(element->elementdata.pathdata.pathheader));
 773             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 774             switch (element->elementdata.pathdata.pathheader.flags)
 775             {
 776                 case FLAGS_NOFLAGS:
 777                     for (i = 0; i < path->pathdata.Count; i++)
 778                     {
 779                         write_float(buffer, filled, path->pathdata.Points[i].X);
 780                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 781                     }
 782                     break;
 783                 case FLAGS_INTPATH:
 784                     for (i = 0; i < path->pathdata.Count; i++)
 785                     {
 786                         write_packed_point(buffer, filled,
 787                                 &path->pathdata.Points[i]);
 788                     }
 789             }
 790             write_path_types(buffer, filled, path);
 791             break;
 792         }
 793         case RegionDataEmptyRect:
 794         case RegionDataInfiniteRect:
 795             break;
 796     }
 797 }
 798
 799 /*****************************************************************************
 800  * GdipGetRegionData [GDIPLUS.@]
 801  *
 802  * Returns the header, followed by combining ops and region elements.
 803  *
 804  * PARAMS
 805  *  region  [I] region to retrieve from
 806  *  buffer  [O] buffer to hold the resulting data
 807  *  size    [I] size of the buffer
 808  *  needed  [O] (optional) how much data was written
 809  *
 810  * RETURNS
 811  *  SUCCESS: Ok
 812  *  FAILURE: InvalidParameter
 813  *
 814  * NOTES
 815  *  The header contains the size, a checksum, a version string, and the number
 816  *  of children. The size does not count itself or the checksum.
 817  *  Version is always something like 0xdbc01001 or 0xdbc01002
 818  *
 819  *  An element is a RECT, or PATH; Combining ops are stored as their
 820  *  CombineMode value. Special regions (infinite, empty) emit just their
 821  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 822  *  their code followed by a second header for the path followed by the actual
 823  *  path data. Followed by the flags for each point. The pathheader contains
 824  *  the size of the data to follow, a version number again, followed by a count
 825  *  of how many points, and any special flags which may apply. 0x4000 means its
 826  *  a path of shorts instead of FLOAT.
 827  *
 828  *  Combining Ops are stored in reverse order from when they were constructed;
 829  *  the output is a tree where the left side combining area is always taken
 830  *  first.
 831  */
 832 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 833         UINT *needed)
 834 {
 835     INT filled = 0;
 836
 837     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 838
 839     if (!(region && buffer && size))
 840         return InvalidParameter;
 841
 842     memcpy(buffer, &region->header, sizeof(region->header));
 843     filled += sizeof(region->header) / sizeof(DWORD);
 844     /* With few exceptions, everything written is DWORD aligned,
 845      * so use that as our base */
 846     write_element(&region->node, (DWORD*)buffer, &filled);
 847
 848     if (needed)
 849         *needed = filled * sizeof(DWORD);
 850
 851     return Ok;
 852 }
 853
 854 /*****************************************************************************
 855  * GdipGetRegionDataSize [GDIPLUS.@]
 856  */
 857 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 858 {
 859     TRACE("%p, %p\n", region, needed);
 860
 861     if (!(region && needed))
 862         return InvalidParameter;
 863
 864     /* header.size doesn't count header.size and header.checksum */
 865     *needed = region->header.size + sizeof(DWORD) * 2;
 866
 867     return Ok;
 868 }
 869
 870 static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
 871 {
 872     HDC new_hdc=NULL;
 873     GpStatus stat;
 874     INT save_state;
 875
 876     if (!graphics)
 877     {
 878         new_hdc = GetDC(0);
 879         if (!new_hdc)
 880             return OutOfMemory;
 881
 882         stat = GdipCreateFromHDC(new_hdc, &graphics);
 883         if (stat != Ok)
 884         {
 885             ReleaseDC(0, new_hdc);
 886             return stat;
 887         }
 888     }
 889
 890     save_state = SaveDC(graphics->hdc);
 891     EndPath(graphics->hdc);
 892
 893     SetPolyFillMode(graphics->hdc, (path->fill == FillModeAlternate ? ALTERNATE
 894                                                                     : WINDING));
 895
 896     stat = trace_path(graphics, path);
 897     if (stat == Ok)
 898     {
 899         *hrgn = PathToRegion(graphics->hdc);
 900         stat = *hrgn ? Ok : OutOfMemory;
 901     }
 902
 903     RestoreDC(graphics->hdc, save_state);
 904     if (new_hdc)
 905     {
 906         ReleaseDC(0, new_hdc);
 907         GdipDeleteGraphics(graphics);
 908     }
 909
 910     return stat;
 911 }
 912
 913 static GpStatus get_region_hrgn(struct region_element *element, GpGraphics *graphics, HRGN *hrgn)
 914 {
 915     switch (element->type)
 916     {
 917         case RegionDataInfiniteRect:
 918             *hrgn = NULL;
 919             return Ok;
 920         case RegionDataEmptyRect:
 921             *hrgn = CreateRectRgn(0, 0, 0, 0);
 922             return *hrgn ? Ok : OutOfMemory;
 923         case RegionDataPath:
 924             return get_path_hrgn(element->elementdata.pathdata.path, graphics, hrgn);
 925         case RegionDataRect:
 926         {
 927             GpPath* path;
 928             GpStatus stat;
 929             GpRectF* rc = &element->elementdata.rect;
 930
 931             stat = GdipCreatePath(FillModeAlternate, &path);
 932             if (stat != Ok)
 933                 return stat;
 934             stat = GdipAddPathRectangle(path, rc->X, rc->Y, rc->Width, rc->Height);
 935
 936             if (stat == Ok)
 937                 stat = get_path_hrgn(path, graphics, hrgn);
 938
 939             GdipDeletePath(path);
 940
 941             return stat;
 942         }
 943         case CombineModeIntersect:
 944         case CombineModeUnion:
 945         case CombineModeXor:
 946         case CombineModeExclude:
 947         case CombineModeComplement:
 948         {
 949             HRGN left, right;
 950             GpStatus stat;
 951             int ret;
 952
 953             stat = get_region_hrgn(element->elementdata.combine.left, graphics, &left);
 954             if (stat != Ok)
 955             {
 956                 *hrgn = NULL;
 957                 return stat;
 958             }
 959
 960             if (left == NULL)
 961             {
 962                 /* existing region is infinite */
 963                 switch (element->type)
 964                 {
 965                     case CombineModeIntersect:
 966                         return get_region_hrgn(element->elementdata.combine.right, graphics, hrgn);
 967                     case CombineModeXor: case CombineModeExclude:
 968                         FIXME("cannot exclude from an infinite region\n");
 969                         /* fall-through */
 970                     case CombineModeUnion: case CombineModeComplement:
 971                         *hrgn = NULL;
 972                         return Ok;
 973                 }
 974             }
 975
 976             stat = get_region_hrgn(element->elementdata.combine.right, graphics, &right);
 977             if (stat != Ok)
 978             {
 979                 DeleteObject(left);
 980                 *hrgn = NULL;
 981                 return stat;
 982             }
 983
 984             if (right == NULL)
 985             {
 986                 /* new region is infinite */
 987                 switch (element->type)
 988                 {
 989                     case CombineModeIntersect:
 990                         *hrgn = left;
 991                         return Ok;
 992                     case CombineModeXor: case CombineModeComplement:
 993                         FIXME("cannot exclude from an infinite region\n");
 994                         /* fall-through */
 995                     case CombineModeUnion: case CombineModeExclude:
 996                         DeleteObject(left);
 997                         *hrgn = NULL;
 998                         return Ok;
 999                 }
1000             }
1001
1002             switch (element->type)
1003             {
1004                 case CombineModeIntersect:
1005                     ret = CombineRgn(left, left, right, RGN_AND);
1006                     break;
1007                 case CombineModeUnion:
1008                     ret = CombineRgn(left, left, right, RGN_OR);
1009                     break;
1010                 case CombineModeXor:
1011                     ret = CombineRgn(left, left, right, RGN_XOR);
1012                     break;
1013                 case CombineModeExclude:
1014                     ret = CombineRgn(left, left, right, RGN_DIFF);
1015                     break;
1016                 case CombineModeComplement:
1017                     ret = CombineRgn(left, right, left, RGN_DIFF);
1018                     break;
1019                 default:
1020                     ret = ERROR;
1021             }
1022
1023             DeleteObject(right);
1024
1025             if (ret == ERROR)
1026             {
1027                 DeleteObject(left);
1028                 *hrgn = NULL;
1029                 return GenericError;
1030             }
1031
1032             *hrgn = left;
1033             return Ok;
1034         }
1035         default:
1036             FIXME("GdipGetRegionHRgn unimplemented for region type=%x\n", element->type);
1037             *hrgn = NULL;
1038             return NotImplemented;
1039     }
1040 }
1041
1042 /*****************************************************************************
1043  * GdipGetRegionHRgn [GDIPLUS.@]
1044  */
1045 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
1046 {
1047     TRACE("(%p, %p, %p)\n", region, graphics, hrgn);
1048
1049     if (!region || !hrgn)
1050         return InvalidParameter;
1051
1052     return get_region_hrgn(&region->node, graphics, hrgn);
1053 }
1054
1055 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1056 {
1057     TRACE("(%p, %p, %p)\n", region, graphics, res);
1058
1059     if(!region || !graphics || !res)
1060         return InvalidParameter;
1061
1062     *res = (region->node.type == RegionDataEmptyRect);
1063
1064     return Ok;
1065 }
1066
1067 /*****************************************************************************
1068  * GdipIsEqualRegion [GDIPLUS.@]
1069  */
1070 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
1071                                       BOOL *res)
1072 {
1073     HRGN hrgn1, hrgn2;
1074     GpStatus stat;
1075
1076     TRACE("(%p, %p, %p, %p)\n", region, region2, graphics, res);
1077
1078     if(!region || !region2 || !graphics || !res)
1079         return InvalidParameter;
1080
1081     stat = GdipGetRegionHRgn(region, graphics, &hrgn1);
1082     if(stat != Ok)
1083         return stat;
1084     stat = GdipGetRegionHRgn(region2, graphics, &hrgn2);
1085     if(stat != Ok){
1086         DeleteObject(hrgn1);
1087         return stat;
1088     }
1089
1090     *res = EqualRgn(hrgn1, hrgn2);
1091
1092     /* one of GpRegions is infinite */
1093     if(*res == ERROR)
1094         *res = (!hrgn1 && !hrgn2);
1095
1096     DeleteObject(hrgn1);
1097     DeleteObject(hrgn2);
1098
1099     return Ok;
1100 }
1101
1102 /*****************************************************************************
1103  * GdipIsInfiniteRegion [GDIPLUS.@]
1104  */
1105 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1106 {
1107     /* I think graphics is ignored here */
1108     TRACE("(%p, %p, %p)\n", region, graphics, res);
1109
1110     if(!region || !graphics || !res)
1111         return InvalidParameter;
1112
1113     *res = (region->node.type == RegionDataInfiniteRect);
1114
1115     return Ok;
1116 }
1117
1118 /*****************************************************************************
1119  * GdipSetEmpty [GDIPLUS.@]
1120  */
1121 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
1122 {
1123     GpStatus stat;
1124
1125     TRACE("%p\n", region);
1126
1127     if (!region)
1128         return InvalidParameter;
1129
1130     delete_element(&region->node);
1131     stat = init_region(region, RegionDataEmptyRect);
1132
1133     return stat;
1134 }
1135
1136 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
1137 {
1138     GpStatus stat;
1139
1140     TRACE("%p\n", region);
1141
1142     if (!region)
1143         return InvalidParameter;
1144
1145     delete_element(&region->node);
1146     stat = init_region(region, RegionDataInfiniteRect);
1147
1148     return stat;
1149 }
1150
1151 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
1152 {
1153     FIXME("(%p, %p): stub\n", region, matrix);
1154
1155     return NotImplemented;
1156 }
1157
1158 /* Translates GpRegion elements with specified offsets */
1159 static void translate_region_element(region_element* element, REAL dx, REAL dy)
1160 {
1161     INT i;
1162
1163     switch(element->type)
1164     {
1165         case RegionDataEmptyRect:
1166         case RegionDataInfiniteRect:
1167             return;
1168         case RegionDataRect:
1169             element->elementdata.rect.X += dx;
1170             element->elementdata.rect.Y += dy;
1171             return;
1172         case RegionDataPath:
1173             for(i = 0; i < element->elementdata.pathdata.path->pathdata.Count; i++){
1174                 element->elementdata.pathdata.path->pathdata.Points[i].X += dx;
1175                 element->elementdata.pathdata.path->pathdata.Points[i].Y += dy;
1176             }
1177             return;
1178         default:
1179             translate_region_element(element->elementdata.combine.left,  dx, dy);
1180             translate_region_element(element->elementdata.combine.right, dx, dy);
1181             return;
1182     }
1183 }
1184
1185 /*****************************************************************************
1186  * GdipTranslateRegion [GDIPLUS.@]
1187  */
1188 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
1189 {
1190     TRACE("(%p, %f, %f)\n", region, dx, dy);
1191
1192     if(!region)
1193         return InvalidParameter;
1194
1195     translate_region_element(&region->node, dx, dy);
1196
1197     return Ok;
1198 }
1199
1200 /*****************************************************************************
1201  * GdipTranslateRegionI [GDIPLUS.@]
1202  */
1203 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
1204 {
1205     TRACE("(%p, %d, %d)\n", region, dx, dy);
1206
1207     return GdipTranslateRegion(region, (REAL)dx, (REAL)dy);
1208 }