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 /*****************************************************************************
 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     status = GdipGetRegionHRgn(region, graphics, &hrgn);
 661     if(status != Ok)
 662         return status;
 663
 664     /* infinite */
 665     if(!hrgn){
 666         rect->X = rect->Y = -(REAL)(1 << 22);
 667         rect->Width = rect->Height = (REAL)(1 << 23);
 668         return Ok;
 669     }
 670
 671     if(!GetRgnBox(hrgn, &r)){
 672         DeleteObject(hrgn);
 673         return GenericError;
 674     }
 675
 676     rect->X = r.left;
 677     rect->Y = r.top;
 678     rect->Width  = r.right  - r.left;
 679     rect->Height = r.bottom - r.top;
 680
 681     return Ok;
 682 }
 683
 684 /*****************************************************************************
 685  * GdipGetRegionBoundsI [GDIPLUS.@]
 686  */
 687 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 688 {
 689     GpRectF rectf;
 690     GpStatus status;
 691
 692     TRACE("(%p, %p, %p)\n", region, graphics, rect);
 693
 694     if(!rect)
 695         return InvalidParameter;
 696
 697     status = GdipGetRegionBounds(region, graphics, &rectf);
 698     if(status == Ok){
 699         rect->X = roundr(rectf.X);
 700         rect->Y = roundr(rectf.X);
 701         rect->Width  = roundr(rectf.Width);
 702         rect->Height = roundr(rectf.Height);
 703     }
 704
 705     return status;
 706 }
 707
 708 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 709 {
 710     location[*offset] = write;
 711     (*offset)++;
 712 }
 713
 714 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 715 {
 716     ((FLOAT*)location)[*offset] = write;
 717     (*offset)++;
 718 }
 719
 720 static inline void write_packed_point(DWORD* location, INT* offset,
 721         const GpPointF* write)
 722 {
 723     packed_point point;
 724
 725     point.X = write->X;
 726     point.Y = write->Y;
 727     memcpy(location + *offset, &point, sizeof(packed_point));
 728     (*offset)++;
 729 }
 730
 731 static inline void write_path_types(DWORD* location, INT* offset,
 732         const GpPath* path)
 733 {
 734     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 735
 736     /* The unwritten parts of the DWORD (if any) must be cleared */
 737     if (path->pathdata.Count % sizeof(DWORD))
 738         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 739                 path->pathdata.Count,
 740                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 741     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 742 }
 743
 744 static void write_element(const region_element* element, DWORD *buffer,
 745         INT* filled)
 746 {
 747     write_dword(buffer, filled, element->type);
 748     switch (element->type)
 749     {
 750         case CombineModeReplace:
 751         case CombineModeIntersect:
 752         case CombineModeUnion:
 753         case CombineModeXor:
 754         case CombineModeExclude:
 755         case CombineModeComplement:
 756             write_element(element->elementdata.combine.left, buffer, filled);
 757             write_element(element->elementdata.combine.right, buffer, filled);
 758             break;
 759         case RegionDataRect:
 760             write_float(buffer, filled, element->elementdata.rect.X);
 761             write_float(buffer, filled, element->elementdata.rect.Y);
 762             write_float(buffer, filled, element->elementdata.rect.Width);
 763             write_float(buffer, filled, element->elementdata.rect.Height);
 764             break;
 765         case RegionDataPath:
 766         {
 767             INT i;
 768             const GpPath* path = element->elementdata.pathdata.path;
 769
 770             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 771                     sizeof(element->elementdata.pathdata.pathheader));
 772             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 773             switch (element->elementdata.pathdata.pathheader.flags)
 774             {
 775                 case FLAGS_NOFLAGS:
 776                     for (i = 0; i < path->pathdata.Count; i++)
 777                     {
 778                         write_float(buffer, filled, path->pathdata.Points[i].X);
 779                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 780                     }
 781                     break;
 782                 case FLAGS_INTPATH:
 783                     for (i = 0; i < path->pathdata.Count; i++)
 784                     {
 785                         write_packed_point(buffer, filled,
 786                                 &path->pathdata.Points[i]);
 787                     }
 788             }
 789             write_path_types(buffer, filled, path);
 790             break;
 791         }
 792         case RegionDataEmptyRect:
 793         case RegionDataInfiniteRect:
 794             break;
 795     }
 796 }
 797
 798 /*****************************************************************************
 799  * GdipGetRegionData [GDIPLUS.@]
 800  *
 801  * Returns the header, followed by combining ops and region elements.
 802  *
 803  * PARAMS
 804  *  region  [I] region to retrieve from
 805  *  buffer  [O] buffer to hold the resulting data
 806  *  size    [I] size of the buffer
 807  *  needed  [O] (optional) how much data was written
 808  *
 809  * RETURNS
 810  *  SUCCESS: Ok
 811  *  FAILURE: InvalidParameter
 812  *
 813  * NOTES
 814  *  The header contains the size, a checksum, a version string, and the number
 815  *  of children. The size does not count itself or the checksum.
 816  *  Version is always something like 0xdbc01001 or 0xdbc01002
 817  *
 818  *  An element is a RECT, or PATH; Combining ops are stored as their
 819  *  CombineMode value. Special regions (infinite, empty) emit just their
 820  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 821  *  their code followed by a second header for the path followed by the actual
 822  *  path data. Followed by the flags for each point. The pathheader contains
 823  *  the size of the data to follow, a version number again, followed by a count
 824  *  of how many points, and any special flags which may apply. 0x4000 means its
 825  *  a path of shorts instead of FLOAT.
 826  *
 827  *  Combining Ops are stored in reverse order from when they were constructed;
 828  *  the output is a tree where the left side combining area is always taken
 829  *  first.
 830  */
 831 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 832         UINT *needed)
 833 {
 834     INT filled = 0;
 835
 836     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 837
 838     if (!(region && buffer && size))
 839         return InvalidParameter;
 840
 841     memcpy(buffer, &region->header, sizeof(region->header));
 842     filled += sizeof(region->header) / sizeof(DWORD);
 843     /* With few exceptions, everything written is DWORD aligned,
 844      * so use that as our base */
 845     write_element(&region->node, (DWORD*)buffer, &filled);
 846
 847     if (needed)
 848         *needed = filled * sizeof(DWORD);
 849
 850     return Ok;
 851 }
 852
 853 /*****************************************************************************
 854  * GdipGetRegionDataSize [GDIPLUS.@]
 855  */
 856 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 857 {
 858     TRACE("%p, %p\n", region, needed);
 859
 860     if (!(region && needed))
 861         return InvalidParameter;
 862
 863     /* header.size doesn't count header.size and header.checksum */
 864     *needed = region->header.size + sizeof(DWORD) * 2;
 865
 866     return Ok;
 867 }
 868
 869 static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
 870 {
 871     HDC new_hdc=NULL;
 872     GpStatus stat;
 873     INT save_state;
 874
 875     if (!graphics)
 876     {
 877         new_hdc = GetDC(0);
 878         if (!new_hdc)
 879             return OutOfMemory;
 880
 881         stat = GdipCreateFromHDC(new_hdc, &graphics);
 882         if (stat != Ok)
 883         {
 884             ReleaseDC(0, new_hdc);
 885             return stat;
 886         }
 887     }
 888
 889     save_state = SaveDC(graphics->hdc);
 890     EndPath(graphics->hdc);
 891
 892     SetPolyFillMode(graphics->hdc, (path->fill == FillModeAlternate ? ALTERNATE
 893                                                                     : WINDING));
 894
 895     stat = trace_path(graphics, path);
 896     if (stat == Ok)
 897     {
 898         *hrgn = PathToRegion(graphics->hdc);
 899         stat = *hrgn ? Ok : OutOfMemory;
 900     }
 901
 902     RestoreDC(graphics->hdc, save_state);
 903     if (new_hdc)
 904     {
 905         ReleaseDC(0, new_hdc);
 906         GdipDeleteGraphics(graphics);
 907     }
 908
 909     return stat;
 910 }
 911
 912 static GpStatus get_region_hrgn(struct region_element *element, GpGraphics *graphics, HRGN *hrgn)
 913 {
 914     switch (element->type)
 915     {
 916         case RegionDataInfiniteRect:
 917             *hrgn = NULL;
 918             return Ok;
 919         case RegionDataEmptyRect:
 920             *hrgn = CreateRectRgn(0, 0, 0, 0);
 921             return *hrgn ? Ok : OutOfMemory;
 922         case RegionDataPath:
 923             return get_path_hrgn(element->elementdata.pathdata.path, graphics, hrgn);
 924         case RegionDataRect:
 925         {
 926             GpPath* path;
 927             GpStatus stat;
 928             GpRectF* rc = &element->elementdata.rect;
 929
 930             stat = GdipCreatePath(FillModeAlternate, &path);
 931             if (stat != Ok)
 932                 return stat;
 933             stat = GdipAddPathRectangle(path, rc->X, rc->Y, rc->Width, rc->Height);
 934
 935             if (stat == Ok)
 936                 stat = get_path_hrgn(path, graphics, hrgn);
 937
 938             GdipDeletePath(path);
 939
 940             return stat;
 941         }
 942         case CombineModeIntersect:
 943         case CombineModeUnion:
 944         case CombineModeXor:
 945         case CombineModeExclude:
 946         case CombineModeComplement:
 947         {
 948             HRGN left, right;
 949             GpStatus stat;
 950             int ret;
 951
 952             stat = get_region_hrgn(element->elementdata.combine.left, graphics, &left);
 953             if (stat != Ok)
 954             {
 955                 *hrgn = NULL;
 956                 return stat;
 957             }
 958
 959             if (left == NULL)
 960             {
 961                 /* existing region is infinite */
 962                 switch (element->type)
 963                 {
 964                     case CombineModeIntersect:
 965                         return get_region_hrgn(element->elementdata.combine.right, graphics, hrgn);
 966                     case CombineModeXor: case CombineModeExclude:
 967                         FIXME("cannot exclude from an infinite region\n");
 968                         /* fall-through */
 969                     case CombineModeUnion: case CombineModeComplement:
 970                         *hrgn = NULL;
 971                         return Ok;
 972                 }
 973             }
 974
 975             stat = get_region_hrgn(element->elementdata.combine.right, graphics, &right);
 976             if (stat != Ok)
 977             {
 978                 DeleteObject(left);
 979                 *hrgn = NULL;
 980                 return stat;
 981             }
 982
 983             if (right == NULL)
 984             {
 985                 /* new region is infinite */
 986                 switch (element->type)
 987                 {
 988                     case CombineModeIntersect:
 989                         *hrgn = left;
 990                         return Ok;
 991                     case CombineModeXor: case CombineModeComplement:
 992                         FIXME("cannot exclude from an infinite region\n");
 993                         /* fall-through */
 994                     case CombineModeUnion: case CombineModeExclude:
 995                         DeleteObject(left);
 996                         *hrgn = NULL;
 997                         return Ok;
 998                 }
 999             }
1000
1001             switch (element->type)
1002             {
1003                 case CombineModeIntersect:
1004                     ret = CombineRgn(left, left, right, RGN_AND);
1005                     break;
1006                 case CombineModeUnion:
1007                     ret = CombineRgn(left, left, right, RGN_OR);
1008                     break;
1009                 case CombineModeXor:
1010                     ret = CombineRgn(left, left, right, RGN_XOR);
1011                     break;
1012                 case CombineModeExclude:
1013                     ret = CombineRgn(left, left, right, RGN_DIFF);
1014                     break;
1015                 case CombineModeComplement:
1016                     ret = CombineRgn(left, right, left, RGN_DIFF);
1017                     break;
1018                 default:
1019                     ret = ERROR;
1020             }
1021
1022             DeleteObject(right);
1023
1024             if (ret == ERROR)
1025             {
1026                 DeleteObject(left);
1027                 *hrgn = NULL;
1028                 return GenericError;
1029             }
1030
1031             *hrgn = left;
1032             return Ok;
1033         }
1034         default:
1035             FIXME("GdipGetRegionHRgn unimplemented for region type=%x\n", element->type);
1036             *hrgn = NULL;
1037             return NotImplemented;
1038     }
1039 }
1040
1041 /*****************************************************************************
1042  * GdipGetRegionHRgn [GDIPLUS.@]
1043  */
1044 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
1045 {
1046     TRACE("(%p, %p, %p)\n", region, graphics, hrgn);
1047
1048     if (!region || !hrgn)
1049         return InvalidParameter;
1050
1051     return get_region_hrgn(&region->node, graphics, hrgn);
1052 }
1053
1054 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1055 {
1056     TRACE("(%p, %p, %p)\n", region, graphics, res);
1057
1058     if(!region || !graphics || !res)
1059         return InvalidParameter;
1060
1061     *res = (region->node.type == RegionDataEmptyRect);
1062
1063     return Ok;
1064 }
1065
1066 /*****************************************************************************
1067  * GdipIsEqualRegion [GDIPLUS.@]
1068  */
1069 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
1070                                       BOOL *res)
1071 {
1072     HRGN hrgn1, hrgn2;
1073     GpStatus stat;
1074
1075     TRACE("(%p, %p, %p, %p)\n", region, region2, graphics, res);
1076
1077     if(!region || !region2 || !graphics || !res)
1078         return InvalidParameter;
1079
1080     stat = GdipGetRegionHRgn(region, graphics, &hrgn1);
1081     if(stat != Ok)
1082         return stat;
1083     stat = GdipGetRegionHRgn(region2, graphics, &hrgn2);
1084     if(stat != Ok){
1085         DeleteObject(hrgn1);
1086         return stat;
1087     }
1088
1089     *res = EqualRgn(hrgn1, hrgn2);
1090
1091     /* one of GpRegions is infinite */
1092     if(*res == ERROR)
1093         *res = (!hrgn1 && !hrgn2);
1094
1095     DeleteObject(hrgn1);
1096     DeleteObject(hrgn2);
1097
1098     return Ok;
1099 }
1100
1101 /*****************************************************************************
1102  * GdipIsInfiniteRegion [GDIPLUS.@]
1103  */
1104 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1105 {
1106     /* I think graphics is ignored here */
1107     TRACE("(%p, %p, %p)\n", region, graphics, res);
1108
1109     if(!region || !graphics || !res)
1110         return InvalidParameter;
1111
1112     *res = (region->node.type == RegionDataInfiniteRect);
1113
1114     return Ok;
1115 }
1116
1117 /*****************************************************************************
1118  * GdipSetEmpty [GDIPLUS.@]
1119  */
1120 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
1121 {
1122     GpStatus stat;
1123
1124     TRACE("%p\n", region);
1125
1126     if (!region)
1127         return InvalidParameter;
1128
1129     delete_element(&region->node);
1130     stat = init_region(region, RegionDataEmptyRect);
1131
1132     return stat;
1133 }
1134
1135 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
1136 {
1137     GpStatus stat;
1138
1139     TRACE("%p\n", region);
1140
1141     if (!region)
1142         return InvalidParameter;
1143
1144     delete_element(&region->node);
1145     stat = init_region(region, RegionDataInfiniteRect);
1146
1147     return stat;
1148 }
1149
1150 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
1151 {
1152     FIXME("(%p, %p): stub\n", region, matrix);
1153
1154     return NotImplemented;
1155 }
1156
1157 /* Translates GpRegion elements with specified offsets */
1158 static void translate_region_element(region_element* element, REAL dx, REAL dy)
1159 {
1160     INT i;
1161
1162     switch(element->type)
1163     {
1164         case RegionDataEmptyRect:
1165         case RegionDataInfiniteRect:
1166             return;
1167         case RegionDataRect:
1168             element->elementdata.rect.X += dx;
1169             element->elementdata.rect.Y += dy;
1170             return;
1171         case RegionDataPath:
1172             for(i = 0; i < element->elementdata.pathdata.path->pathdata.Count; i++){
1173                 element->elementdata.pathdata.path->pathdata.Points[i].X += dx;
1174                 element->elementdata.pathdata.path->pathdata.Points[i].Y += dy;
1175             }
1176             return;
1177         default:
1178             translate_region_element(element->elementdata.combine.left,  dx, dy);
1179             translate_region_element(element->elementdata.combine.right, dx, dy);
1180             return;
1181     }
1182 }
1183
1184 /*****************************************************************************
1185  * GdipTranslateRegion [GDIPLUS.@]
1186  */
1187 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
1188 {
1189     TRACE("(%p, %f, %f)\n", region, dx, dy);
1190
1191     if(!region)
1192         return InvalidParameter;
1193
1194     translate_region_element(&region->node, dx, dy);
1195
1196     return Ok;
1197 }
1198
1199 /*****************************************************************************
1200  * GdipTranslateRegionI [GDIPLUS.@]
1201  */
1202 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
1203 {
1204     TRACE("(%p, %d, %d)\n", region, dx, dy);
1205
1206     return GdipTranslateRegion(region, (REAL)dx, (REAL)dy);
1207 }