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     delete_element(right);
 272     GdipDeleteRegion(path_region);
 273     return stat;
 274 }
 275
 276 /*****************************************************************************
 277  * GdipCombineRegionRect [GDIPLUS.@]
 278  */
 279 GpStatus WINGDIPAPI GdipCombineRegionRect(GpRegion *region,
 280         GDIPCONST GpRectF *rect, CombineMode mode)
 281 {
 282     GpRegion *rect_region;
 283     region_element *left, *right = NULL;
 284     GpStatus stat;
 285
 286     TRACE("%p %p %d\n", region, rect, mode);
 287
 288     if (!(region && rect))
 289         return InvalidParameter;
 290
 291     stat = GdipCreateRegionRect(rect, &rect_region);
 292     if (stat != Ok)
 293         return stat;
 294
 295     /* simply replace region data */
 296     if(mode == CombineModeReplace){
 297         delete_element(&region->node);
 298         memcpy(region, rect_region, sizeof(GpRegion));
 299         return Ok;
 300     }
 301
 302     left = GdipAlloc(sizeof(region_element));
 303     if (!left)
 304         goto out;
 305     memcpy(left, &region->node, sizeof(region_element));
 306
 307     stat = clone_element(&rect_region->node, &right);
 308     if (stat != Ok)
 309         goto out;
 310
 311     fuse_region(region, left, right, mode);
 312
 313     GdipDeleteRegion(rect_region);
 314     return Ok;
 315
 316 out:
 317     GdipFree(left);
 318     delete_element(right);
 319     GdipDeleteRegion(rect_region);
 320     return stat;
 321 }
 322
 323 /*****************************************************************************
 324  * GdipCombineRegionRectI [GDIPLUS.@]
 325  */
 326 GpStatus WINGDIPAPI GdipCombineRegionRectI(GpRegion *region,
 327         GDIPCONST GpRect *rect, CombineMode mode)
 328 {
 329     GpRectF rectf;
 330
 331     TRACE("%p %p %d\n", region, rect, mode);
 332
 333     if (!rect)
 334         return InvalidParameter;
 335
 336     rectf.X = (REAL)rect->X;
 337     rectf.Y = (REAL)rect->Y;
 338     rectf.Height = (REAL)rect->Height;
 339     rectf.Width = (REAL)rect->Width;
 340
 341     return GdipCombineRegionRect(region, &rectf, mode);
 342 }
 343
 344 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
 345         GpRegion *region2, CombineMode mode)
 346 {
 347     region_element *left, *right = NULL;
 348     GpStatus stat;
 349     GpRegion *reg2copy;
 350
 351     TRACE("%p %p %d\n", region1, region2, mode);
 352
 353     if(!(region1 && region2))
 354         return InvalidParameter;
 355
 356     /* simply replace region data */
 357     if(mode == CombineModeReplace){
 358         stat = GdipCloneRegion(region2, &reg2copy);
 359         if(stat != Ok)  return stat;
 360
 361         delete_element(&region1->node);
 362         memcpy(region1, reg2copy, sizeof(GpRegion));
 363         GdipFree(reg2copy);
 364         return Ok;
 365     }
 366
 367     left  = GdipAlloc(sizeof(region_element));
 368     if (!left)
 369         return OutOfMemory;
 370
 371     *left = region1->node;
 372     stat = clone_element(&region2->node, &right);
 373     if (stat != Ok)
 374     {
 375         GdipFree(left);
 376         delete_element(right);
 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 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
 551         GpRegion **region)
 552 {
 553     GpRectF rectf;
 554
 555     TRACE("%p, %p\n", rect, region);
 556
 557     rectf.X = (REAL)rect->X;
 558     rectf.Y = (REAL)rect->Y;
 559     rectf.Width = (REAL)rect->Width;
 560     rectf.Height = (REAL)rect->Height;
 561
 562     return GdipCreateRegionRect(&rectf, region);
 563 }
 564
 565 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 566 {
 567     FIXME("(%p, %d, %p): stub\n", data, size, region);
 568
 569     *region = NULL;
 570     return NotImplemented;
 571 }
 572
 573 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 574 {
 575     FIXME("(%p, %p): stub\n", hrgn, region);
 576
 577     if(!hrgn || !region)
 578         return InvalidParameter;
 579
 580     *region = NULL;
 581     return NotImplemented;
 582 }
 583
 584 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 585 {
 586     TRACE("%p\n", region);
 587
 588     if (!region)
 589         return InvalidParameter;
 590
 591     delete_element(&region->node);
 592     GdipFree(region);
 593
 594     return Ok;
 595 }
 596
 597 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 598 {
 599     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 600
 601     return NotImplemented;
 602 }
 603
 604 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 605 {
 606     FIXME("(%p, %p, %p): stub\n", region, graphics, rect);
 607
 608     return NotImplemented;
 609 }
 610
 611 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 612 {
 613     location[*offset] = write;
 614     (*offset)++;
 615 }
 616
 617 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 618 {
 619     ((FLOAT*)location)[*offset] = write;
 620     (*offset)++;
 621 }
 622
 623 static inline void write_packed_point(DWORD* location, INT* offset,
 624         const GpPointF* write)
 625 {
 626     packed_point point;
 627
 628     point.X = write->X;
 629     point.Y = write->Y;
 630     memcpy(location + *offset, &point, sizeof(packed_point));
 631     (*offset)++;
 632 }
 633
 634 static inline void write_path_types(DWORD* location, INT* offset,
 635         const GpPath* path)
 636 {
 637     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 638
 639     /* The unwritten parts of the DWORD (if any) must be cleared */
 640     if (path->pathdata.Count % sizeof(DWORD))
 641         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 642                 path->pathdata.Count,
 643                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 644     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 645 }
 646
 647 static void write_element(const region_element* element, DWORD *buffer,
 648         INT* filled)
 649 {
 650     write_dword(buffer, filled, element->type);
 651     switch (element->type)
 652     {
 653         case CombineModeReplace:
 654         case CombineModeIntersect:
 655         case CombineModeUnion:
 656         case CombineModeXor:
 657         case CombineModeExclude:
 658         case CombineModeComplement:
 659             write_element(element->elementdata.combine.left, buffer, filled);
 660             write_element(element->elementdata.combine.right, buffer, filled);
 661             break;
 662         case RegionDataRect:
 663             write_float(buffer, filled, element->elementdata.rect.X);
 664             write_float(buffer, filled, element->elementdata.rect.Y);
 665             write_float(buffer, filled, element->elementdata.rect.Width);
 666             write_float(buffer, filled, element->elementdata.rect.Height);
 667             break;
 668         case RegionDataPath:
 669         {
 670             INT i;
 671             const GpPath* path = element->elementdata.pathdata.path;
 672
 673             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 674                     sizeof(element->elementdata.pathdata.pathheader));
 675             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 676             switch (element->elementdata.pathdata.pathheader.flags)
 677             {
 678                 case FLAGS_NOFLAGS:
 679                     for (i = 0; i < path->pathdata.Count; i++)
 680                     {
 681                         write_float(buffer, filled, path->pathdata.Points[i].X);
 682                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 683                     }
 684                     break;
 685                 case FLAGS_INTPATH:
 686                     for (i = 0; i < path->pathdata.Count; i++)
 687                     {
 688                         write_packed_point(buffer, filled,
 689                                 &path->pathdata.Points[i]);
 690                     }
 691             }
 692             write_path_types(buffer, filled, path);
 693             break;
 694         }
 695         case RegionDataEmptyRect:
 696         case RegionDataInfiniteRect:
 697             break;
 698     }
 699 }
 700
 701 /*****************************************************************************
 702  * GdipGetRegionData [GDIPLUS.@]
 703  *
 704  * Returns the header, followed by combining ops and region elements.
 705  *
 706  * PARAMS
 707  *  region  [I] region to retrieve from
 708  *  buffer  [O] buffer to hold the resulting data
 709  *  size    [I] size of the buffer
 710  *  needed  [O] (optional) how much data was written
 711  *
 712  * RETURNS
 713  *  SUCCESS: Ok
 714  *  FAILURE: InvalidParamter
 715  *
 716  * NOTES
 717  *  The header contains the size, a checksum, a version string, and the number
 718  *  of children. The size does not count itself or the checksum.
 719  *  Version is always something like 0xdbc01001 or 0xdbc01002
 720  *
 721  *  An element is a RECT, or PATH; Combining ops are stored as their
 722  *  CombineMode value. Special regions (infinite, empty) emit just their
 723  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 724  *  their code followed by a second header for the path followed by the actual
 725  *  path data. Followed by the flags for each point. The pathheader contains
 726  *  the size of the data to follow, a version number again, followed by a count
 727  *  of how many points, and any special flags which may apply. 0x4000 means its
 728  *  a path of shorts instead of FLOAT.
 729  *
 730  *  Combining Ops are stored in reverse order from when they were constructed;
 731  *  the output is a tree where the left side combining area is always taken
 732  *  first.
 733  */
 734 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 735         UINT *needed)
 736 {
 737     INT filled = 0;
 738
 739     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 740
 741     if (!(region && buffer && size))
 742         return InvalidParameter;
 743
 744     memcpy(buffer, &region->header, sizeof(region->header));
 745     filled += sizeof(region->header) / sizeof(DWORD);
 746     /* With few exceptions, everything written is DWORD aligned,
 747      * so use that as our base */
 748     write_element(&region->node, (DWORD*)buffer, &filled);
 749
 750     if (needed)
 751         *needed = filled * sizeof(DWORD);
 752
 753     return Ok;
 754 }
 755
 756 /*****************************************************************************
 757  * GdipGetRegionDataSize [GDIPLUS.@]
 758  */
 759 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 760 {
 761     TRACE("%p, %p\n", region, needed);
 762
 763     if (!(region && needed))
 764         return InvalidParameter;
 765
 766     /* header.size doesn't count header.size and header.checksum */
 767     *needed = region->header.size + sizeof(DWORD) * 2;
 768
 769     return Ok;
 770 }
 771
 772 static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
 773 {
 774     HDC new_hdc=NULL;
 775     GpStatus stat;
 776     INT save_state;
 777
 778     if (!graphics)
 779     {
 780         new_hdc = GetDC(0);
 781         if (!new_hdc)
 782             return OutOfMemory;
 783
 784         stat = GdipCreateFromHDC(new_hdc, &graphics);
 785         if (stat != Ok)
 786         {
 787             ReleaseDC(0, new_hdc);
 788             return stat;
 789         }
 790     }
 791
 792     save_state = SaveDC(graphics->hdc);
 793     EndPath(graphics->hdc);
 794
 795     SetPolyFillMode(graphics->hdc, (path->fill == FillModeAlternate ? ALTERNATE
 796                                                                     : WINDING));
 797
 798     stat = trace_path(graphics, path);
 799     if (stat == Ok)
 800     {
 801         *hrgn = PathToRegion(graphics->hdc);
 802         stat = *hrgn ? Ok : OutOfMemory;
 803     }
 804
 805     RestoreDC(graphics->hdc, save_state);
 806     if (new_hdc)
 807     {
 808         ReleaseDC(0, new_hdc);
 809         GdipDeleteGraphics(graphics);
 810     }
 811
 812     return stat;
 813 }
 814
 815 static GpStatus get_region_hrgn(struct region_element *element, GpGraphics *graphics, HRGN *hrgn)
 816 {
 817     switch (element->type)
 818     {
 819         case RegionDataInfiniteRect:
 820             *hrgn = NULL;
 821             return Ok;
 822         case RegionDataEmptyRect:
 823             *hrgn = CreateRectRgn(0, 0, 0, 0);
 824             return *hrgn ? Ok : OutOfMemory;
 825         case RegionDataPath:
 826             return get_path_hrgn(element->elementdata.pathdata.path, graphics, hrgn);
 827         case RegionDataRect:
 828         {
 829             GpPath* path;
 830             GpStatus stat;
 831             GpRectF* rc = &element->elementdata.rect;
 832
 833             stat = GdipCreatePath(FillModeAlternate, &path);
 834             if (stat != Ok)
 835                 return stat;
 836             stat = GdipAddPathRectangle(path, rc->X, rc->Y, rc->Width, rc->Height);
 837
 838             if (stat == Ok)
 839                 stat = get_path_hrgn(path, graphics, hrgn);
 840
 841             GdipDeletePath(path);
 842
 843             return stat;
 844         }
 845         case CombineModeIntersect:
 846         case CombineModeUnion:
 847         case CombineModeXor:
 848         case CombineModeExclude:
 849         case CombineModeComplement:
 850         {
 851             HRGN left, right;
 852             GpStatus stat;
 853             int ret;
 854
 855             stat = get_region_hrgn(element->elementdata.combine.left, graphics, &left);
 856             if (stat != Ok)
 857             {
 858                 *hrgn = NULL;
 859                 return stat;
 860             }
 861
 862             if (left == NULL)
 863             {
 864                 /* existing region is infinite */
 865                 switch (element->type)
 866                 {
 867                     case CombineModeIntersect:
 868                         return get_region_hrgn(element->elementdata.combine.right, graphics, hrgn);
 869                     case CombineModeXor: case CombineModeExclude:
 870                         FIXME("cannot exclude from an infinite region\n");
 871                         /* fall-through */
 872                     case CombineModeUnion: case CombineModeComplement:
 873                         *hrgn = NULL;
 874                         return Ok;
 875                 }
 876             }
 877
 878             stat = get_region_hrgn(element->elementdata.combine.right, graphics, &right);
 879             if (stat != Ok)
 880             {
 881                 DeleteObject(left);
 882                 *hrgn = NULL;
 883                 return stat;
 884             }
 885
 886             if (right == NULL)
 887             {
 888                 /* new region is infinite */
 889                 switch (element->type)
 890                 {
 891                     case CombineModeIntersect:
 892                         *hrgn = left;
 893                         return Ok;
 894                     case CombineModeXor: case CombineModeComplement:
 895                         FIXME("cannot exclude from an infinite region\n");
 896                         /* fall-through */
 897                     case CombineModeUnion: case CombineModeExclude:
 898                         DeleteObject(left);
 899                         *hrgn = NULL;
 900                         return Ok;
 901                 }
 902             }
 903
 904             switch (element->type)
 905             {
 906                 case CombineModeIntersect:
 907                     ret = CombineRgn(left, left, right, RGN_AND);
 908                     break;
 909                 case CombineModeUnion:
 910                     ret = CombineRgn(left, left, right, RGN_OR);
 911                     break;
 912                 case CombineModeXor:
 913                     ret = CombineRgn(left, left, right, RGN_XOR);
 914                     break;
 915                 case CombineModeExclude:
 916                     ret = CombineRgn(left, left, right, RGN_DIFF);
 917                     break;
 918                 case CombineModeComplement:
 919                     ret = CombineRgn(left, right, left, RGN_DIFF);
 920                     break;
 921                 default:
 922                     ret = ERROR;
 923             }
 924
 925             DeleteObject(right);
 926
 927             if (ret == ERROR)
 928             {
 929                 DeleteObject(left);
 930                 *hrgn = NULL;
 931                 return GenericError;
 932             }
 933
 934             *hrgn = left;
 935             return Ok;
 936         }
 937         default:
 938             FIXME("GdipGetRegionHRgn unimplemented for region type=%x\n", element->type);
 939             *hrgn = NULL;
 940             return NotImplemented;
 941     }
 942 }
 943
 944 /*****************************************************************************
 945  * GdipGetRegionHRgn [GDIPLUS.@]
 946  */
 947 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
 948 {
 949     TRACE("(%p, %p, %p)\n", region, graphics, hrgn);
 950
 951     if (!region || !hrgn)
 952         return InvalidParameter;
 953
 954     return get_region_hrgn(&region->node, graphics, hrgn);
 955 }
 956
 957 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 958 {
 959     TRACE("(%p, %p, %p)\n", region, graphics, res);
 960
 961     if(!region || !graphics || !res)
 962         return InvalidParameter;
 963
 964     *res = (region->node.type == RegionDataEmptyRect);
 965
 966     return Ok;
 967 }
 968
 969 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
 970                                       BOOL *res)
 971 {
 972     FIXME("(%p, %p, %p, %p): stub\n", region, region2, graphics, res);
 973
 974     return NotImplemented;
 975 }
 976
 977 /*****************************************************************************
 978  * GdipIsInfiniteRegion [GDIPLUS.@]
 979  */
 980 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
 981 {
 982     /* I think graphics is ignored here */
 983     TRACE("(%p, %p, %p)\n", region, graphics, res);
 984
 985     if(!region || !graphics || !res)
 986         return InvalidParameter;
 987
 988     *res = (region->node.type == RegionDataInfiniteRect);
 989
 990     return Ok;
 991 }
 992
 993 /*****************************************************************************
 994  * GdipSetEmpty [GDIPLUS.@]
 995  */
 996 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
 997 {
 998     GpStatus stat;
 999
1000     TRACE("%p\n", region);
1001
1002     if (!region)
1003         return InvalidParameter;
1004
1005     delete_element(&region->node);
1006     stat = init_region(region, RegionDataEmptyRect);
1007
1008     return stat;
1009 }
1010
1011 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
1012 {
1013     GpStatus stat;
1014
1015     TRACE("%p\n", region);
1016
1017     if (!region)
1018         return InvalidParameter;
1019
1020     delete_element(&region->node);
1021     stat = init_region(region, RegionDataInfiniteRect);
1022
1023     return stat;
1024 }
1025
1026 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
1027 {
1028     FIXME("(%p, %p): stub\n", region, matrix);
1029
1030     return NotImplemented;
1031 }
1032
1033 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
1034 {
1035     FIXME("(%p, %f, %f): stub\n", region, dx, dy);
1036
1037     return NotImplemented;
1038 }
1039
1040 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
1041 {
1042     FIXME("(%p, %d, %d): stub\n", region, dx, dy);
1043
1044     return NotImplemented;
1045 }