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         GdipFree(path_region);
 253         return Ok;
 254     }
 255
 256     left = GdipAlloc(sizeof(region_element));
 257     if (!left)
 258         goto out;
 259     *left = region->node;
 260
 261     stat = clone_element(&path_region->node, &right);
 262     if (stat != Ok)
 263         goto out;
 264
 265     fuse_region(region, left, right, mode);
 266
 267     GdipDeleteRegion(path_region);
 268     return Ok;
 269
 270 out:
 271     GdipFree(left);
 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         GdipFree(rect_region);
 300         return Ok;
 301     }
 302
 303     left = GdipAlloc(sizeof(region_element));
 304     if (!left)
 305         goto out;
 306     memcpy(left, &region->node, sizeof(region_element));
 307
 308     stat = clone_element(&rect_region->node, &right);
 309     if (stat != Ok)
 310         goto out;
 311
 312     fuse_region(region, left, right, mode);
 313
 314     GdipDeleteRegion(rect_region);
 315     return Ok;
 316
 317 out:
 318     GdipFree(left);
 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 /*****************************************************************************
 345  * GdipCombineRegionRegion [GDIPLUS.@]
 346  */
 347 GpStatus WINGDIPAPI GdipCombineRegionRegion(GpRegion *region1,
 348         GpRegion *region2, CombineMode mode)
 349 {
 350     region_element *left, *right = NULL;
 351     GpStatus stat;
 352     GpRegion *reg2copy;
 353
 354     TRACE("%p %p %d\n", region1, region2, mode);
 355
 356     if(!(region1 && region2))
 357         return InvalidParameter;
 358
 359     /* simply replace region data */
 360     if(mode == CombineModeReplace){
 361         stat = GdipCloneRegion(region2, &reg2copy);
 362         if(stat != Ok)  return stat;
 363
 364         delete_element(&region1->node);
 365         memcpy(region1, reg2copy, sizeof(GpRegion));
 366         GdipFree(reg2copy);
 367         return Ok;
 368     }
 369
 370     left  = GdipAlloc(sizeof(region_element));
 371     if (!left)
 372         return OutOfMemory;
 373
 374     *left = region1->node;
 375     stat = clone_element(&region2->node, &right);
 376     if (stat != Ok)
 377     {
 378         GdipFree(left);
 379         return OutOfMemory;
 380     }
 381
 382     fuse_region(region1, left, right, mode);
 383     region1->header.num_children += region2->header.num_children;
 384
 385     return Ok;
 386 }
 387
 388 /*****************************************************************************
 389  * GdipCreateRegion [GDIPLUS.@]
 390  */
 391 GpStatus WINGDIPAPI GdipCreateRegion(GpRegion **region)
 392 {
 393     TRACE("%p\n", region);
 394
 395     if(!region)
 396         return InvalidParameter;
 397
 398     *region = GdipAlloc(sizeof(GpRegion));
 399     if(!*region)
 400         return OutOfMemory;
 401
 402     return init_region(*region, RegionDataInfiniteRect);
 403 }
 404
 405 /*****************************************************************************
 406  * GdipCreateRegionPath [GDIPLUS.@]
 407  *
 408  * Creates a GpRegion from a GpPath
 409  *
 410  * PARAMS
 411  *  path    [I] path to base the region on
 412  *  region  [O] pointer to the newly allocated region
 413  *
 414  * RETURNS
 415  *  SUCCESS: Ok
 416  *  FAILURE: InvalidParameter
 417  *
 418  * NOTES
 419  *  If a path has no floating point points, its points will be stored as shorts
 420  *  (INTPATH)
 421  *
 422  *  If a path is empty, it is considered to be an INTPATH
 423  */
 424 GpStatus WINGDIPAPI GdipCreateRegionPath(GpPath *path, GpRegion **region)
 425 {
 426     region_element* element;
 427     GpPoint  *pointsi;
 428     GpPointF *pointsf;
 429
 430     GpStatus stat;
 431     DWORD flags = FLAGS_INTPATH;
 432     INT count, i;
 433
 434     TRACE("%p, %p\n", path, region);
 435
 436     if (!(path && region))
 437         return InvalidParameter;
 438
 439     *region = GdipAlloc(sizeof(GpRegion));
 440     if(!*region)
 441         return OutOfMemory;
 442     stat = init_region(*region, RegionDataPath);
 443     if (stat != Ok)
 444     {
 445         GdipDeleteRegion(*region);
 446         return stat;
 447     }
 448     element = &(*region)->node;
 449     count = path->pathdata.Count;
 450
 451     /* Test to see if the path is an Integer path */
 452     if (count)
 453     {
 454         pointsi = GdipAlloc(sizeof(GpPoint) * count);
 455         pointsf = GdipAlloc(sizeof(GpPointF) * count);
 456         if (!(pointsi && pointsf))
 457         {
 458             GdipFree(pointsi);
 459             GdipFree(pointsf);
 460             GdipDeleteRegion(*region);
 461             return OutOfMemory;
 462         }
 463
 464         stat = GdipGetPathPointsI(path, pointsi, count);
 465         if (stat != Ok)
 466         {
 467             GdipDeleteRegion(*region);
 468             return stat;
 469         }
 470         stat = GdipGetPathPoints(path, pointsf, count);
 471         if (stat != Ok)
 472         {
 473             GdipDeleteRegion(*region);
 474             return stat;
 475         }
 476
 477         for (i = 0; i < count; i++)
 478         {
 479             if (!(pointsi[i].X == pointsf[i].X &&
 480                   pointsi[i].Y == pointsf[i].Y ))
 481             {
 482                 flags = FLAGS_NOFLAGS;
 483                 break;
 484             }
 485         }
 486         GdipFree(pointsi);
 487         GdipFree(pointsf);
 488     }
 489
 490     stat = GdipClonePath(path, &element->elementdata.pathdata.path);
 491     if (stat != Ok)
 492     {
 493         GdipDeleteRegion(*region);
 494         return stat;
 495     }
 496
 497     /* 3 for headers, once again size doesn't count itself */
 498     element->elementdata.pathdata.pathheader.size = ((sizeof(DWORD) * 3));
 499     switch(flags)
 500     {
 501         /* Floats, sent out as floats */
 502         case FLAGS_NOFLAGS:
 503             element->elementdata.pathdata.pathheader.size +=
 504                 (sizeof(DWORD) * count * 2);
 505             break;
 506         /* INTs, sent out as packed shorts */
 507         case FLAGS_INTPATH:
 508             element->elementdata.pathdata.pathheader.size +=
 509                 (sizeof(DWORD) * count);
 510             break;
 511         default:
 512             FIXME("Unhandled flags (%08x). Expect wrong results.\n", flags);
 513     }
 514     element->elementdata.pathdata.pathheader.size += get_pathtypes_size(path);
 515     element->elementdata.pathdata.pathheader.magic = VERSION_MAGIC;
 516     element->elementdata.pathdata.pathheader.count = count;
 517     element->elementdata.pathdata.pathheader.flags = flags;
 518     (*region)->header.size = sizeheader_size + get_element_size(element);
 519
 520     return Ok;
 521 }
 522
 523 /*****************************************************************************
 524  * GdipCreateRegionRect [GDIPLUS.@]
 525  */
 526 GpStatus WINGDIPAPI GdipCreateRegionRect(GDIPCONST GpRectF *rect,
 527         GpRegion **region)
 528 {
 529     GpStatus stat;
 530
 531     TRACE("%p, %p\n", rect, region);
 532
 533     if (!(rect && region))
 534         return InvalidParameter;
 535
 536     *region = GdipAlloc(sizeof(GpRegion));
 537     stat = init_region(*region, RegionDataRect);
 538     if(stat != Ok)
 539     {
 540         GdipDeleteRegion(*region);
 541         return stat;
 542     }
 543
 544     (*region)->node.elementdata.rect.X = rect->X;
 545     (*region)->node.elementdata.rect.Y = rect->Y;
 546     (*region)->node.elementdata.rect.Width = rect->Width;
 547     (*region)->node.elementdata.rect.Height = rect->Height;
 548
 549     return Ok;
 550 }
 551
 552 /*****************************************************************************
 553  * GdipCreateRegionRectI [GDIPLUS.@]
 554  */
 555 GpStatus WINGDIPAPI GdipCreateRegionRectI(GDIPCONST GpRect *rect,
 556         GpRegion **region)
 557 {
 558     GpRectF rectf;
 559
 560     TRACE("%p, %p\n", rect, region);
 561
 562     rectf.X = (REAL)rect->X;
 563     rectf.Y = (REAL)rect->Y;
 564     rectf.Width = (REAL)rect->Width;
 565     rectf.Height = (REAL)rect->Height;
 566
 567     return GdipCreateRegionRect(&rectf, region);
 568 }
 569
 570 GpStatus WINGDIPAPI GdipCreateRegionRgnData(GDIPCONST BYTE *data, INT size, GpRegion **region)
 571 {
 572     FIXME("(%p, %d, %p): stub\n", data, size, region);
 573
 574     *region = NULL;
 575     return NotImplemented;
 576 }
 577
 578
 579 /******************************************************************************
 580  * GdipCreateRegionHrgn [GDIPLUS.@]
 581  */
 582 GpStatus WINGDIPAPI GdipCreateRegionHrgn(HRGN hrgn, GpRegion **region)
 583 {
 584     DWORD size;
 585     LPRGNDATA buf;
 586     LPRECT rect;
 587     GpStatus stat;
 588     GpPath* path;
 589     GpRegion* local;
 590     int i;
 591
 592     TRACE("(%p, %p)\n", hrgn, region);
 593
 594     if(!region || !(size = GetRegionData(hrgn, 0, NULL)))
 595         return InvalidParameter;
 596
 597     buf = GdipAlloc(size);
 598     if(!buf)
 599         return OutOfMemory;
 600
 601     if(!GetRegionData(hrgn, size, buf)){
 602         GdipFree(buf);
 603         return GenericError;
 604     }
 605
 606     if(buf->rdh.nCount == 0){
 607         if((stat = GdipCreateRegion(&local)) != Ok){
 608             GdipFree(buf);
 609             return stat;
 610         }
 611         if((stat = GdipSetEmpty(local)) != Ok){
 612             GdipFree(buf);
 613             GdipDeleteRegion(local);
 614             return stat;
 615         }
 616         *region = local;
 617         GdipFree(buf);
 618         return Ok;
 619     }
 620
 621     if((stat = GdipCreatePath(FillModeAlternate, &path)) != Ok){
 622         GdipFree(buf);
 623         return stat;
 624     }
 625
 626     rect = (LPRECT)buf->Buffer;
 627     for(i = 0; i < buf->rdh.nCount; i++){
 628         if((stat = GdipAddPathRectangle(path, (REAL)rect->left, (REAL)rect->top,
 629                         (REAL)(rect->right - rect->left), (REAL)(rect->bottom - rect->top))) != Ok){
 630             GdipFree(buf);
 631             GdipDeletePath(path);
 632             return stat;
 633         }
 634         rect++;
 635     }
 636
 637     stat = GdipCreateRegionPath(path, region);
 638
 639     GdipFree(buf);
 640     GdipDeletePath(path);
 641     return stat;
 642 }
 643
 644 /*****************************************************************************
 645  * GdipDeleteRegion [GDIPLUS.@]
 646  */
 647 GpStatus WINGDIPAPI GdipDeleteRegion(GpRegion *region)
 648 {
 649     TRACE("%p\n", region);
 650
 651     if (!region)
 652         return InvalidParameter;
 653
 654     delete_element(&region->node);
 655     GdipFree(region);
 656
 657     return Ok;
 658 }
 659
 660 /*****************************************************************************
 661  * GdipGetRegionBounds [GDIPLUS.@]
 662  */
 663 GpStatus WINGDIPAPI GdipGetRegionBounds(GpRegion *region, GpGraphics *graphics, GpRectF *rect)
 664 {
 665     HRGN hrgn;
 666     RECT r;
 667     GpStatus status;
 668
 669     TRACE("(%p, %p, %p)\n", region, graphics, rect);
 670
 671     if(!region || !graphics || !rect)
 672         return InvalidParameter;
 673
 674     /* Contrary to MSDN, native ignores the graphics transform. */
 675     status = GdipGetRegionHRgn(region, NULL, &hrgn);
 676     if(status != Ok)
 677         return status;
 678
 679     /* infinite */
 680     if(!hrgn){
 681         rect->X = rect->Y = -(REAL)(1 << 22);
 682         rect->Width = rect->Height = (REAL)(1 << 23);
 683         return Ok;
 684     }
 685
 686     if(!GetRgnBox(hrgn, &r)){
 687         DeleteObject(hrgn);
 688         return GenericError;
 689     }
 690
 691     rect->X = r.left;
 692     rect->Y = r.top;
 693     rect->Width  = r.right  - r.left;
 694     rect->Height = r.bottom - r.top;
 695
 696     return Ok;
 697 }
 698
 699 /*****************************************************************************
 700  * GdipGetRegionBoundsI [GDIPLUS.@]
 701  */
 702 GpStatus WINGDIPAPI GdipGetRegionBoundsI(GpRegion *region, GpGraphics *graphics, GpRect *rect)
 703 {
 704     GpRectF rectf;
 705     GpStatus status;
 706
 707     TRACE("(%p, %p, %p)\n", region, graphics, rect);
 708
 709     if(!rect)
 710         return InvalidParameter;
 711
 712     status = GdipGetRegionBounds(region, graphics, &rectf);
 713     if(status == Ok){
 714         rect->X = roundr(rectf.X);
 715         rect->Y = roundr(rectf.X);
 716         rect->Width  = roundr(rectf.Width);
 717         rect->Height = roundr(rectf.Height);
 718     }
 719
 720     return status;
 721 }
 722
 723 static inline void write_dword(DWORD* location, INT* offset, const DWORD write)
 724 {
 725     location[*offset] = write;
 726     (*offset)++;
 727 }
 728
 729 static inline void write_float(DWORD* location, INT* offset, const FLOAT write)
 730 {
 731     ((FLOAT*)location)[*offset] = write;
 732     (*offset)++;
 733 }
 734
 735 static inline void write_packed_point(DWORD* location, INT* offset,
 736         const GpPointF* write)
 737 {
 738     packed_point point;
 739
 740     point.X = write->X;
 741     point.Y = write->Y;
 742     memcpy(location + *offset, &point, sizeof(packed_point));
 743     (*offset)++;
 744 }
 745
 746 static inline void write_path_types(DWORD* location, INT* offset,
 747         const GpPath* path)
 748 {
 749     memcpy(location + *offset, path->pathdata.Types, path->pathdata.Count);
 750
 751     /* The unwritten parts of the DWORD (if any) must be cleared */
 752     if (path->pathdata.Count % sizeof(DWORD))
 753         ZeroMemory(((BYTE*)location) + (*offset * sizeof(DWORD)) +
 754                 path->pathdata.Count,
 755                 sizeof(DWORD) - path->pathdata.Count % sizeof(DWORD));
 756     *offset += (get_pathtypes_size(path) / sizeof(DWORD));
 757 }
 758
 759 static void write_element(const region_element* element, DWORD *buffer,
 760         INT* filled)
 761 {
 762     write_dword(buffer, filled, element->type);
 763     switch (element->type)
 764     {
 765         case CombineModeReplace:
 766         case CombineModeIntersect:
 767         case CombineModeUnion:
 768         case CombineModeXor:
 769         case CombineModeExclude:
 770         case CombineModeComplement:
 771             write_element(element->elementdata.combine.left, buffer, filled);
 772             write_element(element->elementdata.combine.right, buffer, filled);
 773             break;
 774         case RegionDataRect:
 775             write_float(buffer, filled, element->elementdata.rect.X);
 776             write_float(buffer, filled, element->elementdata.rect.Y);
 777             write_float(buffer, filled, element->elementdata.rect.Width);
 778             write_float(buffer, filled, element->elementdata.rect.Height);
 779             break;
 780         case RegionDataPath:
 781         {
 782             INT i;
 783             const GpPath* path = element->elementdata.pathdata.path;
 784
 785             memcpy(buffer + *filled, &element->elementdata.pathdata.pathheader,
 786                     sizeof(element->elementdata.pathdata.pathheader));
 787             *filled += sizeof(element->elementdata.pathdata.pathheader) / sizeof(DWORD);
 788             switch (element->elementdata.pathdata.pathheader.flags)
 789             {
 790                 case FLAGS_NOFLAGS:
 791                     for (i = 0; i < path->pathdata.Count; i++)
 792                     {
 793                         write_float(buffer, filled, path->pathdata.Points[i].X);
 794                         write_float(buffer, filled, path->pathdata.Points[i].Y);
 795                     }
 796                     break;
 797                 case FLAGS_INTPATH:
 798                     for (i = 0; i < path->pathdata.Count; i++)
 799                     {
 800                         write_packed_point(buffer, filled,
 801                                 &path->pathdata.Points[i]);
 802                     }
 803             }
 804             write_path_types(buffer, filled, path);
 805             break;
 806         }
 807         case RegionDataEmptyRect:
 808         case RegionDataInfiniteRect:
 809             break;
 810     }
 811 }
 812
 813 /*****************************************************************************
 814  * GdipGetRegionData [GDIPLUS.@]
 815  *
 816  * Returns the header, followed by combining ops and region elements.
 817  *
 818  * PARAMS
 819  *  region  [I] region to retrieve from
 820  *  buffer  [O] buffer to hold the resulting data
 821  *  size    [I] size of the buffer
 822  *  needed  [O] (optional) how much data was written
 823  *
 824  * RETURNS
 825  *  SUCCESS: Ok
 826  *  FAILURE: InvalidParameter
 827  *
 828  * NOTES
 829  *  The header contains the size, a checksum, a version string, and the number
 830  *  of children. The size does not count itself or the checksum.
 831  *  Version is always something like 0xdbc01001 or 0xdbc01002
 832  *
 833  *  An element is a RECT, or PATH; Combining ops are stored as their
 834  *  CombineMode value. Special regions (infinite, empty) emit just their
 835  *  op-code; GpRectFs emit their code followed by their points; GpPaths emit
 836  *  their code followed by a second header for the path followed by the actual
 837  *  path data. Followed by the flags for each point. The pathheader contains
 838  *  the size of the data to follow, a version number again, followed by a count
 839  *  of how many points, and any special flags which may apply. 0x4000 means its
 840  *  a path of shorts instead of FLOAT.
 841  *
 842  *  Combining Ops are stored in reverse order from when they were constructed;
 843  *  the output is a tree where the left side combining area is always taken
 844  *  first.
 845  */
 846 GpStatus WINGDIPAPI GdipGetRegionData(GpRegion *region, BYTE *buffer, UINT size,
 847         UINT *needed)
 848 {
 849     INT filled = 0;
 850
 851     TRACE("%p, %p, %d, %p\n", region, buffer, size, needed);
 852
 853     if (!(region && buffer && size))
 854         return InvalidParameter;
 855
 856     memcpy(buffer, &region->header, sizeof(region->header));
 857     filled += sizeof(region->header) / sizeof(DWORD);
 858     /* With few exceptions, everything written is DWORD aligned,
 859      * so use that as our base */
 860     write_element(&region->node, (DWORD*)buffer, &filled);
 861
 862     if (needed)
 863         *needed = filled * sizeof(DWORD);
 864
 865     return Ok;
 866 }
 867
 868 /*****************************************************************************
 869  * GdipGetRegionDataSize [GDIPLUS.@]
 870  */
 871 GpStatus WINGDIPAPI GdipGetRegionDataSize(GpRegion *region, UINT *needed)
 872 {
 873     TRACE("%p, %p\n", region, needed);
 874
 875     if (!(region && needed))
 876         return InvalidParameter;
 877
 878     /* header.size doesn't count header.size and header.checksum */
 879     *needed = region->header.size + sizeof(DWORD) * 2;
 880
 881     return Ok;
 882 }
 883
 884 static GpStatus get_path_hrgn(GpPath *path, GpGraphics *graphics, HRGN *hrgn)
 885 {
 886     HDC new_hdc=NULL;
 887     GpStatus stat;
 888     INT save_state;
 889
 890     if (!graphics)
 891     {
 892         new_hdc = GetDC(0);
 893         if (!new_hdc)
 894             return OutOfMemory;
 895
 896         stat = GdipCreateFromHDC(new_hdc, &graphics);
 897         if (stat != Ok)
 898         {
 899             ReleaseDC(0, new_hdc);
 900             return stat;
 901         }
 902     }
 903
 904     save_state = SaveDC(graphics->hdc);
 905     EndPath(graphics->hdc);
 906
 907     SetPolyFillMode(graphics->hdc, (path->fill == FillModeAlternate ? ALTERNATE
 908                                                                     : WINDING));
 909
 910     stat = trace_path(graphics, path);
 911     if (stat == Ok)
 912     {
 913         *hrgn = PathToRegion(graphics->hdc);
 914         stat = *hrgn ? Ok : OutOfMemory;
 915     }
 916
 917     RestoreDC(graphics->hdc, save_state);
 918     if (new_hdc)
 919     {
 920         ReleaseDC(0, new_hdc);
 921         GdipDeleteGraphics(graphics);
 922     }
 923
 924     return stat;
 925 }
 926
 927 static GpStatus get_region_hrgn(struct region_element *element, GpGraphics *graphics, HRGN *hrgn)
 928 {
 929     switch (element->type)
 930     {
 931         case RegionDataInfiniteRect:
 932             *hrgn = NULL;
 933             return Ok;
 934         case RegionDataEmptyRect:
 935             *hrgn = CreateRectRgn(0, 0, 0, 0);
 936             return *hrgn ? Ok : OutOfMemory;
 937         case RegionDataPath:
 938             return get_path_hrgn(element->elementdata.pathdata.path, graphics, hrgn);
 939         case RegionDataRect:
 940         {
 941             GpPath* path;
 942             GpStatus stat;
 943             GpRectF* rc = &element->elementdata.rect;
 944
 945             stat = GdipCreatePath(FillModeAlternate, &path);
 946             if (stat != Ok)
 947                 return stat;
 948             stat = GdipAddPathRectangle(path, rc->X, rc->Y, rc->Width, rc->Height);
 949
 950             if (stat == Ok)
 951                 stat = get_path_hrgn(path, graphics, hrgn);
 952
 953             GdipDeletePath(path);
 954
 955             return stat;
 956         }
 957         case CombineModeIntersect:
 958         case CombineModeUnion:
 959         case CombineModeXor:
 960         case CombineModeExclude:
 961         case CombineModeComplement:
 962         {
 963             HRGN left, right;
 964             GpStatus stat;
 965             int ret;
 966
 967             stat = get_region_hrgn(element->elementdata.combine.left, graphics, &left);
 968             if (stat != Ok)
 969             {
 970                 *hrgn = NULL;
 971                 return stat;
 972             }
 973
 974             if (left == NULL)
 975             {
 976                 /* existing region is infinite */
 977                 switch (element->type)
 978                 {
 979                     case CombineModeIntersect:
 980                         return get_region_hrgn(element->elementdata.combine.right, graphics, hrgn);
 981                     case CombineModeXor: case CombineModeExclude:
 982                         FIXME("cannot exclude from an infinite region\n");
 983                         /* fall-through */
 984                     case CombineModeUnion: case CombineModeComplement:
 985                         *hrgn = NULL;
 986                         return Ok;
 987                 }
 988             }
 989
 990             stat = get_region_hrgn(element->elementdata.combine.right, graphics, &right);
 991             if (stat != Ok)
 992             {
 993                 DeleteObject(left);
 994                 *hrgn = NULL;
 995                 return stat;
 996             }
 997
 998             if (right == NULL)
 999             {
1000                 /* new region is infinite */
1001                 switch (element->type)
1002                 {
1003                     case CombineModeIntersect:
1004                         *hrgn = left;
1005                         return Ok;
1006                     case CombineModeXor: case CombineModeComplement:
1007                         FIXME("cannot exclude from an infinite region\n");
1008                         /* fall-through */
1009                     case CombineModeUnion: case CombineModeExclude:
1010                         DeleteObject(left);
1011                         *hrgn = NULL;
1012                         return Ok;
1013                 }
1014             }
1015
1016             switch (element->type)
1017             {
1018                 case CombineModeIntersect:
1019                     ret = CombineRgn(left, left, right, RGN_AND);
1020                     break;
1021                 case CombineModeUnion:
1022                     ret = CombineRgn(left, left, right, RGN_OR);
1023                     break;
1024                 case CombineModeXor:
1025                     ret = CombineRgn(left, left, right, RGN_XOR);
1026                     break;
1027                 case CombineModeExclude:
1028                     ret = CombineRgn(left, left, right, RGN_DIFF);
1029                     break;
1030                 case CombineModeComplement:
1031                     ret = CombineRgn(left, right, left, RGN_DIFF);
1032                     break;
1033                 default:
1034                     ret = ERROR;
1035             }
1036
1037             DeleteObject(right);
1038
1039             if (ret == ERROR)
1040             {
1041                 DeleteObject(left);
1042                 *hrgn = NULL;
1043                 return GenericError;
1044             }
1045
1046             *hrgn = left;
1047             return Ok;
1048         }
1049         default:
1050             FIXME("GdipGetRegionHRgn unimplemented for region type=%x\n", element->type);
1051             *hrgn = NULL;
1052             return NotImplemented;
1053     }
1054 }
1055
1056 /*****************************************************************************
1057  * GdipGetRegionHRgn [GDIPLUS.@]
1058  */
1059 GpStatus WINGDIPAPI GdipGetRegionHRgn(GpRegion *region, GpGraphics *graphics, HRGN *hrgn)
1060 {
1061     TRACE("(%p, %p, %p)\n", region, graphics, hrgn);
1062
1063     if (!region || !hrgn)
1064         return InvalidParameter;
1065
1066     return get_region_hrgn(&region->node, graphics, hrgn);
1067 }
1068
1069 GpStatus WINGDIPAPI GdipIsEmptyRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1070 {
1071     TRACE("(%p, %p, %p)\n", region, graphics, res);
1072
1073     if(!region || !graphics || !res)
1074         return InvalidParameter;
1075
1076     *res = (region->node.type == RegionDataEmptyRect);
1077
1078     return Ok;
1079 }
1080
1081 /*****************************************************************************
1082  * GdipIsEqualRegion [GDIPLUS.@]
1083  */
1084 GpStatus WINGDIPAPI GdipIsEqualRegion(GpRegion *region, GpRegion *region2, GpGraphics *graphics,
1085                                       BOOL *res)
1086 {
1087     HRGN hrgn1, hrgn2;
1088     GpStatus stat;
1089
1090     TRACE("(%p, %p, %p, %p)\n", region, region2, graphics, res);
1091
1092     if(!region || !region2 || !graphics || !res)
1093         return InvalidParameter;
1094
1095     stat = GdipGetRegionHRgn(region, graphics, &hrgn1);
1096     if(stat != Ok)
1097         return stat;
1098     stat = GdipGetRegionHRgn(region2, graphics, &hrgn2);
1099     if(stat != Ok){
1100         DeleteObject(hrgn1);
1101         return stat;
1102     }
1103
1104     *res = EqualRgn(hrgn1, hrgn2);
1105
1106     /* one of GpRegions is infinite */
1107     if(*res == ERROR)
1108         *res = (!hrgn1 && !hrgn2);
1109
1110     DeleteObject(hrgn1);
1111     DeleteObject(hrgn2);
1112
1113     return Ok;
1114 }
1115
1116 /*****************************************************************************
1117  * GdipIsInfiniteRegion [GDIPLUS.@]
1118  */
1119 GpStatus WINGDIPAPI GdipIsInfiniteRegion(GpRegion *region, GpGraphics *graphics, BOOL *res)
1120 {
1121     /* I think graphics is ignored here */
1122     TRACE("(%p, %p, %p)\n", region, graphics, res);
1123
1124     if(!region || !graphics || !res)
1125         return InvalidParameter;
1126
1127     *res = (region->node.type == RegionDataInfiniteRect);
1128
1129     return Ok;
1130 }
1131
1132 /*****************************************************************************
1133  * GdipIsVisibleRegionRect [GDIPLUS.@]
1134  */
1135 GpStatus WINGDIPAPI GdipIsVisibleRegionRect(GpRegion* region, REAL x, REAL y, REAL w, REAL h, GpGraphics *graphics, BOOL *res)
1136 {
1137     HRGN hrgn;
1138     GpStatus stat;
1139     RECT rect;
1140
1141     TRACE("(%p, %.2f, %.2f, %.2f, %.2f, %p, %p)\n", region, x, y, w, h, graphics, res);
1142
1143     if(!region || !res)
1144         return InvalidParameter;
1145
1146     if((stat = GdipGetRegionHRgn(region, NULL, &hrgn)) != Ok)
1147         return stat;
1148
1149     /* infinite */
1150     if(!hrgn){
1151         *res = TRUE;
1152         return Ok;
1153     }
1154
1155     rect.left = ceilr(x);
1156     rect.top = ceilr(y);
1157     rect.right = ceilr(x + w);
1158     rect.bottom = ceilr(y + h);
1159
1160     *res = RectInRegion(hrgn, &rect);
1161
1162     DeleteObject(hrgn);
1163
1164     return Ok;
1165 }
1166
1167 /*****************************************************************************
1168  * GdipIsVisibleRegionRectI [GDIPLUS.@]
1169  */
1170 GpStatus WINGDIPAPI GdipIsVisibleRegionRectI(GpRegion* region, INT x, INT y, INT w, INT h, GpGraphics *graphics, BOOL *res)
1171 {
1172     TRACE("(%p, %d, %d, %d, %d, %p, %p)\n", region, x, y, w, h, graphics, res);
1173     if(!region || !res)
1174         return InvalidParameter;
1175
1176     return GdipIsVisibleRegionRect(region, (REAL)x, (REAL)y, (REAL)w, (REAL)h, graphics, res);
1177 }
1178
1179 /*****************************************************************************
1180  * GdipIsVisibleRegionPoint [GDIPLUS.@]
1181  */
1182 GpStatus WINGDIPAPI GdipIsVisibleRegionPoint(GpRegion* region, REAL x, REAL y, GpGraphics *graphics, BOOL *res)
1183 {
1184     HRGN hrgn;
1185     GpStatus stat;
1186
1187     TRACE("(%p, %.2f, %.2f, %p, %p)\n", region, x, y, graphics, res);
1188
1189     if(!region || !res)
1190         return InvalidParameter;
1191
1192     if((stat = GdipGetRegionHRgn(region, NULL, &hrgn)) != Ok)
1193         return stat;
1194
1195     /* infinite */
1196     if(!hrgn){
1197         *res = TRUE;
1198         return Ok;
1199     }
1200
1201     *res = PtInRegion(hrgn, roundr(x), roundr(y));
1202
1203     DeleteObject(hrgn);
1204
1205     return Ok;
1206 }
1207
1208 /*****************************************************************************
1209  * GdipIsVisibleRegionPointI [GDIPLUS.@]
1210  */
1211 GpStatus WINGDIPAPI GdipIsVisibleRegionPointI(GpRegion* region, INT x, INT y, GpGraphics *graphics, BOOL *res)
1212 {
1213     TRACE("(%p, %d, %d, %p, %p)\n", region, x, y, graphics, res);
1214
1215     return GdipIsVisibleRegionPoint(region, (REAL)x, (REAL)y, graphics, res);
1216 }
1217
1218 /*****************************************************************************
1219  * GdipSetEmpty [GDIPLUS.@]
1220  */
1221 GpStatus WINGDIPAPI GdipSetEmpty(GpRegion *region)
1222 {
1223     GpStatus stat;
1224
1225     TRACE("%p\n", region);
1226
1227     if (!region)
1228         return InvalidParameter;
1229
1230     delete_element(&region->node);
1231     stat = init_region(region, RegionDataEmptyRect);
1232
1233     return stat;
1234 }
1235
1236 GpStatus WINGDIPAPI GdipSetInfinite(GpRegion *region)
1237 {
1238     GpStatus stat;
1239
1240     TRACE("%p\n", region);
1241
1242     if (!region)
1243         return InvalidParameter;
1244
1245     delete_element(&region->node);
1246     stat = init_region(region, RegionDataInfiniteRect);
1247
1248     return stat;
1249 }
1250
1251 GpStatus WINGDIPAPI GdipTransformRegion(GpRegion *region, GpMatrix *matrix)
1252 {
1253     FIXME("(%p, %p): stub\n", region, matrix);
1254
1255     return NotImplemented;
1256 }
1257
1258 /* Translates GpRegion elements with specified offsets */
1259 static void translate_region_element(region_element* element, REAL dx, REAL dy)
1260 {
1261     INT i;
1262
1263     switch(element->type)
1264     {
1265         case RegionDataEmptyRect:
1266         case RegionDataInfiniteRect:
1267             return;
1268         case RegionDataRect:
1269             element->elementdata.rect.X += dx;
1270             element->elementdata.rect.Y += dy;
1271             return;
1272         case RegionDataPath:
1273             for(i = 0; i < element->elementdata.pathdata.path->pathdata.Count; i++){
1274                 element->elementdata.pathdata.path->pathdata.Points[i].X += dx;
1275                 element->elementdata.pathdata.path->pathdata.Points[i].Y += dy;
1276             }
1277             return;
1278         default:
1279             translate_region_element(element->elementdata.combine.left,  dx, dy);
1280             translate_region_element(element->elementdata.combine.right, dx, dy);
1281             return;
1282     }
1283 }
1284
1285 /*****************************************************************************
1286  * GdipTranslateRegion [GDIPLUS.@]
1287  */
1288 GpStatus WINGDIPAPI GdipTranslateRegion(GpRegion *region, REAL dx, REAL dy)
1289 {
1290     TRACE("(%p, %f, %f)\n", region, dx, dy);
1291
1292     if(!region)
1293         return InvalidParameter;
1294
1295     translate_region_element(&region->node, dx, dy);
1296
1297     return Ok;
1298 }
1299
1300 /*****************************************************************************
1301  * GdipTranslateRegionI [GDIPLUS.@]
1302  */
1303 GpStatus WINGDIPAPI GdipTranslateRegionI(GpRegion *region, INT dx, INT dy)
1304 {
1305     TRACE("(%p, %d, %d)\n", region, dx, dy);
1306
1307     return GdipTranslateRegion(region, (REAL)dx, (REAL)dy);
1308 }