graphics/painting.c

   1 /*
   2  * GDI drawing functions.
   3  *
   4  * Copyright 1993, 1994 Alexandre Julliard
   5  * Copyright 1997 Bertho A. Stultiens
   6  *           1999 Huw D M Davies
   7  */
   8
   9 #include <string.h>
  10 #include <stdlib.h>
  11
  12 #include "windef.h"
  13 #include "wingdi.h"
  14 #include "winerror.h"
  15 #include "gdi.h"
  16 #include "bitmap.h"
  17 #include "region.h"
  18 #include "path.h"
  19 #include "debugtools.h"
  20
  21 DEFAULT_DEBUG_CHANNEL(gdi);
  22
  23
  24 /***********************************************************************
  25  *           LineTo    (GDI.19)
  26  */
  27 BOOL16 WINAPI LineTo16( HDC16 hdc, INT16 x, INT16 y )
  28 {
  29     return LineTo( hdc, x, y );
  30 }
  31
  32
  33 /***********************************************************************
  34  *           LineTo    (GDI32.@)
  35  */
  36 BOOL WINAPI LineTo( HDC hdc, INT x, INT y )
  37 {
  38     DC * dc = DC_GetDCUpdate( hdc );
  39     BOOL ret;
  40
  41     if(!dc) return FALSE;
  42
  43     if(PATH_IsPathOpen(dc->path))
  44         ret = PATH_LineTo(dc, x, y);
  45     else
  46         ret = dc->funcs->pLineTo && dc->funcs->pLineTo(dc,x,y);
  47     if(ret) {
  48         dc->CursPosX = x;
  49         dc->CursPosY = y;
  50     }
  51     GDI_ReleaseObj( hdc );
  52     return ret;
  53 }
  54
  55
  56 /***********************************************************************
  57  *           MoveTo    (GDI.20)
  58  */
  59 DWORD WINAPI MoveTo16( HDC16 hdc, INT16 x, INT16 y )
  60 {
  61     POINT pt;
  62
  63     if (!MoveToEx( (HDC)hdc, x, y, &pt )) return 0;
  64     return MAKELONG(pt.x,pt.y);
  65 }
  66
  67
  68 /***********************************************************************
  69  *           MoveToEx    (GDI.483)
  70  */
  71 BOOL16 WINAPI MoveToEx16( HDC16 hdc, INT16 x, INT16 y, LPPOINT16 pt )
  72 {
  73     POINT pt32;
  74
  75     if (!MoveToEx( (HDC)hdc, (INT)x, (INT)y, &pt32 )) return FALSE;
  76     if (pt) CONV_POINT32TO16( &pt32, pt );
  77     return TRUE;
  78 }
  79
  80
  81 /***********************************************************************
  82  *           MoveToEx    (GDI32.@)
  83  */
  84 BOOL WINAPI MoveToEx( HDC hdc, INT x, INT y, LPPOINT pt )
  85 {
  86     BOOL ret = TRUE;
  87     DC * dc = DC_GetDCPtr( hdc );
  88
  89     if(!dc) return FALSE;
  90
  91     if(pt) {
  92         pt->x = dc->CursPosX;
  93         pt->y = dc->CursPosY;
  94     }
  95     dc->CursPosX = x;
  96     dc->CursPosY = y;
  97
  98     if(PATH_IsPathOpen(dc->path)) ret = PATH_MoveTo(dc);
  99     else if (dc->funcs->pMoveTo) ret = dc->funcs->pMoveTo(dc,x,y);
 100     GDI_ReleaseObj( hdc );
 101     return ret;
 102 }
 103
 104
 105 /***********************************************************************
 106  *           Arc    (GDI.23)
 107  */
 108 BOOL16 WINAPI Arc16( HDC16 hdc, INT16 left, INT16 top, INT16 right,
 109                      INT16 bottom, INT16 xstart, INT16 ystart,
 110                      INT16 xend, INT16 yend )
 111 {
 112     return Arc( (HDC)hdc, (INT)left, (INT)top, (INT)right,
 113                   (INT)bottom, (INT)xstart, (INT)ystart, (INT)xend,
 114                   (INT)yend );
 115 }
 116
 117
 118 /***********************************************************************
 119  *           Arc    (GDI32.@)
 120  */
 121 BOOL WINAPI Arc( HDC hdc, INT left, INT top, INT right,
 122                      INT bottom, INT xstart, INT ystart,
 123                      INT xend, INT yend )
 124 {
 125     BOOL ret = FALSE;
 126     DC * dc = DC_GetDCUpdate( hdc );
 127     if (dc)
 128     {
 129     if(PATH_IsPathOpen(dc->path))
 130             ret = PATH_Arc(dc, left, top, right, bottom, xstart, ystart, xend, yend,0);
 131         else if (dc->funcs->pArc)
 132             ret = dc->funcs->pArc(dc,left,top,right,bottom,xstart,ystart,xend,yend);
 133         GDI_ReleaseObj( hdc );
 134     }
 135     return ret;
 136 }
 137
 138 /***********************************************************************
 139  *           ArcTo    (GDI32.@)
 140  */
 141 BOOL WINAPI ArcTo( HDC hdc,
 142                      INT left,   INT top,
 143                      INT right,  INT bottom,
 144                      INT xstart, INT ystart,
 145                      INT xend,   INT yend )
 146 {
 147     BOOL result;
 148     DC * dc = DC_GetDCUpdate( hdc );
 149     if(!dc) return FALSE;
 150
 151     if(dc->funcs->pArcTo)
 152     {
 153         result = dc->funcs->pArcTo( dc, left, top, right, bottom,
 154                                   xstart, ystart, xend, yend );
 155         GDI_ReleaseObj( hdc );
 156         return result;
 157     }
 158     GDI_ReleaseObj( hdc );
 159     /*
 160      * Else emulate it.
 161      * According to the documentation, a line is drawn from the current
 162      * position to the starting point of the arc.
 163      */
 164     LineTo(hdc, xstart, ystart);
 165     /*
 166      * Then the arc is drawn.
 167      */
 168     result = Arc(hdc, left, top, right, bottom, xstart, ystart, xend, yend);
 169     /*
 170      * If no error occured, the current position is moved to the ending
 171      * point of the arc.
 172      */
 173     if (result) MoveToEx(hdc, xend, yend, NULL);
 174     return result;
 175 }
 176
 177 /***********************************************************************
 178  *           Pie    (GDI.26)
 179  */
 180 BOOL16 WINAPI Pie16( HDC16 hdc, INT16 left, INT16 top,
 181                      INT16 right, INT16 bottom, INT16 xstart, INT16 ystart,
 182                      INT16 xend, INT16 yend )
 183 {
 184     return Pie( (HDC)hdc, (INT)left, (INT)top, (INT)right,
 185                   (INT)bottom, (INT)xstart, (INT)ystart, (INT)xend,
 186                   (INT)yend );
 187 }
 188
 189
 190 /***********************************************************************
 191  *           Pie   (GDI32.@)
 192  */
 193 BOOL WINAPI Pie( HDC hdc, INT left, INT top,
 194                      INT right, INT bottom, INT xstart, INT ystart,
 195                      INT xend, INT yend )
 196 {
 197     BOOL ret = FALSE;
 198     DC * dc = DC_GetDCUpdate( hdc );
 199     if (!dc) return FALSE;
 200
 201     if(PATH_IsPathOpen(dc->path))
 202         ret = PATH_Arc(dc,left,top,right,bottom,xstart,ystart,xend,yend,2);
 203     else if(dc->funcs->pPie)
 204         ret = dc->funcs->pPie(dc,left,top,right,bottom,xstart,ystart,xend,yend);
 205
 206     GDI_ReleaseObj( hdc );
 207     return ret;
 208 }
 209
 210
 211 /***********************************************************************
 212  *           Chord    (GDI.348)
 213  */
 214 BOOL16 WINAPI Chord16( HDC16 hdc, INT16 left, INT16 top,
 215                        INT16 right, INT16 bottom, INT16 xstart, INT16 ystart,
 216                        INT16 xend, INT16 yend )
 217 {
 218     return Chord( hdc, left, top, right, bottom, xstart, ystart, xend, yend );
 219 }
 220
 221
 222 /***********************************************************************
 223  *           Chord    (GDI32.@)
 224  */
 225 BOOL WINAPI Chord( HDC hdc, INT left, INT top,
 226                        INT right, INT bottom, INT xstart, INT ystart,
 227                        INT xend, INT yend )
 228 {
 229     BOOL ret = FALSE;
 230     DC * dc = DC_GetDCUpdate( hdc );
 231     if (!dc) return FALSE;
 232
 233     if(PATH_IsPathOpen(dc->path))
 234         ret = PATH_Arc(dc,left,top,right,bottom,xstart,ystart,xend,yend,1);
 235     else if(dc->funcs->pChord)
 236         ret = dc->funcs->pChord(dc,left,top,right,bottom,xstart,ystart,xend,yend);
 237
 238     GDI_ReleaseObj( hdc );
 239     return ret;
 240 }
 241
 242
 243 /***********************************************************************
 244  *           Ellipse    (GDI.24)
 245  */
 246 BOOL16 WINAPI Ellipse16( HDC16 hdc, INT16 left, INT16 top,
 247                          INT16 right, INT16 bottom )
 248 {
 249     return Ellipse( hdc, left, top, right, bottom );
 250 }
 251
 252
 253 /***********************************************************************
 254  *           Ellipse    (GDI32.@)
 255  */
 256 BOOL WINAPI Ellipse( HDC hdc, INT left, INT top,
 257                          INT right, INT bottom )
 258 {
 259     BOOL ret = FALSE;
 260     DC * dc = DC_GetDCUpdate( hdc );
 261     if (!dc) return FALSE;
 262
 263     if(PATH_IsPathOpen(dc->path))
 264         ret = PATH_Ellipse(dc,left,top,right,bottom);
 265     else if (dc->funcs->pEllipse)
 266         ret = dc->funcs->pEllipse(dc,left,top,right,bottom);
 267
 268     GDI_ReleaseObj( hdc );
 269     return ret;
 270 }
 271
 272
 273 /***********************************************************************
 274  *           Rectangle    (GDI.27)
 275  */
 276 BOOL16 WINAPI Rectangle16( HDC16 hdc, INT16 left, INT16 top,
 277                            INT16 right, INT16 bottom )
 278 {
 279     return Rectangle( hdc, left, top, right, bottom );
 280 }
 281
 282
 283 /***********************************************************************
 284  *           Rectangle    (GDI32.@)
 285  */
 286 BOOL WINAPI Rectangle( HDC hdc, INT left, INT top,
 287                            INT right, INT bottom )
 288 {
 289     BOOL ret = FALSE;
 290     DC * dc = DC_GetDCUpdate( hdc );
 291     if (dc)
 292     {
 293     if(PATH_IsPathOpen(dc->path))
 294             ret = PATH_Rectangle(dc, left, top, right, bottom);
 295         else if (dc->funcs->pRectangle)
 296             ret = dc->funcs->pRectangle(dc,left,top,right,bottom);
 297         GDI_ReleaseObj( hdc );
 298     }
 299     return ret;
 300 }
 301
 302
 303 /***********************************************************************
 304  *           RoundRect    (GDI.28)
 305  */
 306 BOOL16 WINAPI RoundRect16( HDC16 hdc, INT16 left, INT16 top, INT16 right,
 307                            INT16 bottom, INT16 ell_width, INT16 ell_height )
 308 {
 309     return RoundRect( hdc, left, top, right, bottom, ell_width, ell_height );
 310 }
 311
 312
 313 /***********************************************************************
 314  *           RoundRect    (GDI32.@)
 315  */
 316 BOOL WINAPI RoundRect( HDC hdc, INT left, INT top, INT right,
 317                            INT bottom, INT ell_width, INT ell_height )
 318 {
 319     BOOL ret = FALSE;
 320     DC *dc = DC_GetDCUpdate( hdc );
 321
 322     if (dc)
 323     {
 324         if(PATH_IsPathOpen(dc->path))
 325             ret = PATH_RoundRect(dc,left,top,right,bottom,ell_width,ell_height);
 326         else if (dc->funcs->pRoundRect)
 327             ret = dc->funcs->pRoundRect(dc,left,top,right,bottom,ell_width,ell_height);
 328         GDI_ReleaseObj( hdc );
 329     }
 330     return ret;
 331 }
 332
 333 /***********************************************************************
 334  *           SetPixel    (GDI.31)
 335  */
 336 COLORREF WINAPI SetPixel16( HDC16 hdc, INT16 x, INT16 y, COLORREF color )
 337 {
 338     return SetPixel( hdc, x, y, color );
 339 }
 340
 341
 342 /***********************************************************************
 343  *           SetPixel    (GDI32.@)
 344  */
 345 COLORREF WINAPI SetPixel( HDC hdc, INT x, INT y, COLORREF color )
 346 {
 347     COLORREF ret = 0;
 348     DC * dc = DC_GetDCUpdate( hdc );
 349     if (dc)
 350     {
 351         if (dc->funcs->pSetPixel) ret = dc->funcs->pSetPixel(dc,x,y,color);
 352         GDI_ReleaseObj( hdc );
 353     }
 354     return ret;
 355 }
 356
 357 /***********************************************************************
 358  *           SetPixelV    (GDI32.@)
 359  */
 360 BOOL WINAPI SetPixelV( HDC hdc, INT x, INT y, COLORREF color )
 361 {
 362     BOOL ret = FALSE;
 363     DC * dc = DC_GetDCUpdate( hdc );
 364     if (dc)
 365     {
 366         if (dc->funcs->pSetPixel)
 367         {
 368             dc->funcs->pSetPixel(dc,x,y,color);
 369             ret = TRUE;
 370         }
 371         GDI_ReleaseObj( hdc );
 372     }
 373     return ret;
 374 }
 375
 376 /***********************************************************************
 377  *           GetPixel    (GDI.83)
 378  */
 379 COLORREF WINAPI GetPixel16( HDC16 hdc, INT16 x, INT16 y )
 380 {
 381     return GetPixel( hdc, x, y );
 382 }
 383
 384
 385 /***********************************************************************
 386  *           GetPixel    (GDI32.@)
 387  */
 388 COLORREF WINAPI GetPixel( HDC hdc, INT x, INT y )
 389 {
 390     COLORREF ret = CLR_INVALID;
 391     DC * dc = DC_GetDCUpdate( hdc );
 392
 393     if (dc)
 394     {
 395     /* FIXME: should this be in the graphics driver? */
 396         if (PtVisible( hdc, x, y ))
 397         {
 398             if (dc->funcs->pGetPixel) ret = dc->funcs->pGetPixel(dc,x,y);
 399         }
 400         GDI_ReleaseObj( hdc );
 401     }
 402     return ret;
 403 }
 404
 405
 406 /******************************************************************************
 407  * ChoosePixelFormat [GDI32.@]
 408  * Matches a pixel format to given format
 409  *
 410  * PARAMS
 411  *    hdc  [I] Device context to search for best pixel match
 412  *    ppfd [I] Pixel format for which a match is sought
 413  *
 414  * RETURNS
 415  *    Success: Pixel format index closest to given format
 416  *    Failure: 0
 417  */
 418 INT WINAPI ChoosePixelFormat( HDC hdc, const LPPIXELFORMATDESCRIPTOR ppfd )
 419 {
 420     INT ret = 0;
 421     DC * dc = DC_GetDCPtr( hdc );
 422
 423     TRACE("(%08x,%p)\n",hdc,ppfd);
 424
 425     if (!dc) return 0;
 426
 427     if (!dc->funcs->pChoosePixelFormat) FIXME(" :stub\n");
 428     else ret = dc->funcs->pChoosePixelFormat(dc,ppfd);
 429
 430     GDI_ReleaseObj( hdc );
 431     return ret;
 432 }
 433
 434
 435 /******************************************************************************
 436  * SetPixelFormat [GDI32.@]
 437  * Sets pixel format of device context
 438  *
 439  * PARAMS
 440  *    hdc          [I] Device context to search for best pixel match
 441  *    iPixelFormat [I] Pixel format index
 442  *    ppfd         [I] Pixel format for which a match is sought
 443  *
 444  * RETURNS STD
 445  */
 446 BOOL WINAPI SetPixelFormat( HDC hdc, INT iPixelFormat,
 447                             const PIXELFORMATDESCRIPTOR *ppfd)
 448 {
 449     INT bRet = FALSE;
 450     DC * dc = DC_GetDCPtr( hdc );
 451
 452     TRACE("(%d,%d,%p)\n",hdc,iPixelFormat,ppfd);
 453
 454     if (!dc) return 0;
 455
 456     if (!dc->funcs->pSetPixelFormat) FIXME(" :stub\n");
 457     else bRet = dc->funcs->pSetPixelFormat(dc,iPixelFormat,ppfd);
 458
 459     GDI_ReleaseObj( hdc );
 460     return bRet;
 461 }
 462
 463
 464 /******************************************************************************
 465  * GetPixelFormat [GDI32.@]
 466  * Gets index of pixel format of DC
 467  *
 468  * PARAMETERS
 469  *    hdc [I] Device context whose pixel format index is sought
 470  *
 471  * RETURNS
 472  *    Success: Currently selected pixel format
 473  *    Failure: 0
 474  */
 475 INT WINAPI GetPixelFormat( HDC hdc )
 476 {
 477     INT ret = 0;
 478     DC * dc = DC_GetDCPtr( hdc );
 479
 480     TRACE("(%08x)\n",hdc);
 481
 482     if (!dc) return 0;
 483
 484     if (!dc->funcs->pGetPixelFormat) FIXME(" :stub\n");
 485     else ret = dc->funcs->pGetPixelFormat(dc);
 486
 487     GDI_ReleaseObj( hdc );
 488     return ret;
 489 }
 490
 491
 492 /******************************************************************************
 493  * DescribePixelFormat [GDI32.@]
 494  * Gets info about pixel format from DC
 495  *
 496  * PARAMS
 497  *    hdc          [I] Device context
 498  *    iPixelFormat [I] Pixel format selector
 499  *    nBytes       [I] Size of buffer
 500  *    ppfd         [O] Pointer to structure to receive pixel format data
 501  *
 502  * RETURNS
 503  *    Success: Maximum pixel format index of the device context
 504  *    Failure: 0
 505  */
 506 INT WINAPI DescribePixelFormat( HDC hdc, INT iPixelFormat, UINT nBytes,
 507                                 LPPIXELFORMATDESCRIPTOR ppfd )
 508 {
 509     INT ret = 0;
 510     DC * dc = DC_GetDCPtr( hdc );
 511
 512     TRACE("(%08x,%d,%d,%p): stub\n",hdc,iPixelFormat,nBytes,ppfd);
 513
 514     if (!dc) return 0;
 515
 516     if (!dc->funcs->pDescribePixelFormat)
 517     {
 518         FIXME(" :stub\n");
 519         ppfd->nSize = nBytes;
 520         ppfd->nVersion = 1;
 521         ret = 3;
 522     }
 523     else ret = dc->funcs->pDescribePixelFormat(dc,iPixelFormat,nBytes,ppfd);
 524
 525     GDI_ReleaseObj( hdc );
 526     return ret;
 527 }
 528
 529
 530 /******************************************************************************
 531  * SwapBuffers [GDI32.@]
 532  * Exchanges front and back buffers of window
 533  *
 534  * PARAMS
 535  *    hdc [I] Device context whose buffers get swapped
 536  *
 537  * RETURNS STD
 538  */
 539 BOOL WINAPI SwapBuffers( HDC hdc )
 540 {
 541     INT bRet = FALSE;
 542     DC * dc = DC_GetDCPtr( hdc );
 543
 544     TRACE("(%08x)\n",hdc);
 545
 546     if (!dc) return TRUE;
 547
 548     if (!dc->funcs->pSwapBuffers)
 549     {
 550         FIXME(" :stub\n");
 551         bRet = TRUE;
 552     }
 553     else bRet = dc->funcs->pSwapBuffers(dc);
 554
 555     GDI_ReleaseObj( hdc );
 556     return bRet;
 557 }
 558
 559
 560 /***********************************************************************
 561  *           PaintRgn    (GDI.43)
 562  */
 563 BOOL16 WINAPI PaintRgn16( HDC16 hdc, HRGN16 hrgn )
 564 {
 565     return PaintRgn( hdc, hrgn );
 566 }
 567
 568
 569 /***********************************************************************
 570  *           PaintRgn    (GDI32.@)
 571  */
 572 BOOL WINAPI PaintRgn( HDC hdc, HRGN hrgn )
 573 {
 574     BOOL ret = FALSE;
 575     DC * dc = DC_GetDCUpdate( hdc );
 576     if (dc)
 577     {
 578         if (dc->funcs->pPaintRgn) ret = dc->funcs->pPaintRgn(dc,hrgn);
 579         GDI_ReleaseObj( hdc );
 580     }
 581     return ret;
 582 }
 583
 584
 585 /***********************************************************************
 586  *           FillRgn    (GDI.40)
 587  */
 588 BOOL16 WINAPI FillRgn16( HDC16 hdc, HRGN16 hrgn, HBRUSH16 hbrush )
 589 {
 590     return FillRgn( hdc, hrgn, hbrush );
 591 }
 592
 593
 594 /***********************************************************************
 595  *           FillRgn    (GDI32.@)
 596  */
 597 BOOL WINAPI FillRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush )
 598 {
 599     BOOL retval = FALSE;
 600     HBRUSH prevBrush;
 601     DC * dc = DC_GetDCUpdate( hdc );
 602
 603     if (!dc) return FALSE;
 604     if(dc->funcs->pFillRgn)
 605         retval = dc->funcs->pFillRgn(dc, hrgn, hbrush);
 606     else if ((prevBrush = SelectObject( hdc, hbrush )))
 607     {
 608     retval = PaintRgn( hdc, hrgn );
 609     SelectObject( hdc, prevBrush );
 610     }
 611     GDI_ReleaseObj( hdc );
 612     return retval;
 613 }
 614
 615
 616 /***********************************************************************
 617  *           FrameRgn     (GDI.41)
 618  */
 619 BOOL16 WINAPI FrameRgn16( HDC16 hdc, HRGN16 hrgn, HBRUSH16 hbrush,
 620                           INT16 nWidth, INT16 nHeight )
 621 {
 622     return FrameRgn( hdc, hrgn, hbrush, nWidth, nHeight );
 623 }
 624
 625
 626 /***********************************************************************
 627  *           FrameRgn     (GDI32.@)
 628  */
 629 BOOL WINAPI FrameRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush,
 630                           INT nWidth, INT nHeight )
 631 {
 632     BOOL ret = FALSE;
 633     DC *dc = DC_GetDCUpdate( hdc );
 634
 635     if (!dc) return FALSE;
 636     if(dc->funcs->pFrameRgn)
 637         ret = dc->funcs->pFrameRgn( dc, hrgn, hbrush, nWidth, nHeight );
 638     else
 639     {
 640         HRGN tmp = CreateRectRgn( 0, 0, 0, 0 );
 641         if (tmp)
 642         {
 643             if (REGION_FrameRgn( tmp, hrgn, nWidth, nHeight ))
 644             {
 645                 FillRgn( hdc, tmp, hbrush );
 646                 ret = TRUE;
 647             }
 648             DeleteObject( tmp );
 649         }
 650     }
 651     GDI_ReleaseObj( hdc );
 652     return ret;
 653 }
 654
 655
 656 /***********************************************************************
 657  *           InvertRgn    (GDI.42)
 658  */
 659 BOOL16 WINAPI InvertRgn16( HDC16 hdc, HRGN16 hrgn )
 660 {
 661     return InvertRgn( hdc, hrgn );
 662 }
 663
 664
 665 /***********************************************************************
 666  *           InvertRgn    (GDI32.@)
 667  */
 668 BOOL WINAPI InvertRgn( HDC hdc, HRGN hrgn )
 669 {
 670     HBRUSH prevBrush;
 671     INT prevROP;
 672     BOOL retval;
 673     DC *dc = DC_GetDCUpdate( hdc );
 674     if (!dc) return FALSE;
 675
 676     if(dc->funcs->pInvertRgn)
 677         retval = dc->funcs->pInvertRgn( dc, hrgn );
 678     else
 679     {
 680     prevBrush = SelectObject( hdc, GetStockObject(BLACK_BRUSH) );
 681     prevROP = SetROP2( hdc, R2_NOT );
 682     retval = PaintRgn( hdc, hrgn );
 683     SelectObject( hdc, prevBrush );
 684     SetROP2( hdc, prevROP );
 685     }
 686     GDI_ReleaseObj( hdc );
 687     return retval;
 688 }
 689
 690 /**********************************************************************
 691  *          Polyline  (GDI.37)
 692  */
 693 BOOL16 WINAPI Polyline16( HDC16 hdc, const POINT16* pt, INT16 count )
 694 {
 695     register int i;
 696     BOOL16 ret;
 697     LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
 698                                            count*sizeof(POINT) );
 699
 700     if (!pt32) return FALSE;
 701     for (i=count;i--;) CONV_POINT16TO32(&(pt[i]),&(pt32[i]));
 702     ret = Polyline(hdc,pt32,count);
 703     HeapFree( GetProcessHeap(), 0, pt32 );
 704     return ret;
 705 }
 706
 707
 708 /**********************************************************************
 709  *          Polyline   (GDI32.@)
 710  */
 711 BOOL WINAPI Polyline( HDC hdc, const POINT* pt, INT count )
 712 {
 713     BOOL ret = FALSE;
 714     DC * dc = DC_GetDCUpdate( hdc );
 715     if (dc)
 716     {
 717         if (PATH_IsPathOpen(dc->path)) ret = PATH_Polyline(dc, pt, count);
 718         else if (dc->funcs->pPolyline) ret = dc->funcs->pPolyline(dc,pt,count);
 719         GDI_ReleaseObj( hdc );
 720     }
 721     return ret;
 722 }
 723
 724 /**********************************************************************
 725  *          PolylineTo   (GDI32.@)
 726  */
 727 BOOL WINAPI PolylineTo( HDC hdc, const POINT* pt, DWORD cCount )
 728 {
 729     DC * dc = DC_GetDCUpdate( hdc );
 730     BOOL ret = FALSE;
 731
 732     if(!dc) return FALSE;
 733
 734     if(PATH_IsPathOpen(dc->path))
 735         ret = PATH_PolylineTo(dc, pt, cCount);
 736
 737     else if(dc->funcs->pPolylineTo)
 738         ret = dc->funcs->pPolylineTo(dc, pt, cCount);
 739
 740     else { /* do it using Polyline */
 741         POINT *pts = HeapAlloc( GetProcessHeap(), 0,
 742                                 sizeof(POINT) * (cCount + 1) );
 743         if (pts)
 744         {
 745         pts[0].x = dc->CursPosX;
 746         pts[0].y = dc->CursPosY;
 747         memcpy( pts + 1, pt, sizeof(POINT) * cCount );
 748         ret = Polyline( hdc, pts, cCount + 1 );
 749         HeapFree( GetProcessHeap(), 0, pts );
 750     }
 751     }
 752     if(ret) {
 753         dc->CursPosX = pt[cCount-1].x;
 754         dc->CursPosY = pt[cCount-1].y;
 755     }
 756     GDI_ReleaseObj( hdc );
 757     return ret;
 758 }
 759
 760 /**********************************************************************
 761  *          Polygon  (GDI.36)
 762  */
 763 BOOL16 WINAPI Polygon16( HDC16 hdc, const POINT16* pt, INT16 count )
 764 {
 765     register int i;
 766     BOOL ret;
 767     LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
 768                                            count*sizeof(POINT) );
 769
 770     if (!pt32) return FALSE;
 771     for (i=count;i--;) CONV_POINT16TO32(&(pt[i]),&(pt32[i]));
 772     ret = Polygon(hdc,pt32,count);
 773     HeapFree( GetProcessHeap(), 0, pt32 );
 774     return ret;
 775 }
 776
 777
 778 /**********************************************************************
 779  *          Polygon  (GDI32.@)
 780  */
 781 BOOL WINAPI Polygon( HDC hdc, const POINT* pt, INT count )
 782 {
 783     BOOL ret = FALSE;
 784     DC * dc = DC_GetDCUpdate( hdc );
 785     if (dc)
 786     {
 787         if (PATH_IsPathOpen(dc->path)) ret = PATH_Polygon(dc, pt, count);
 788         else if (dc->funcs->pPolygon) ret = dc->funcs->pPolygon(dc,pt,count);
 789         GDI_ReleaseObj( hdc );
 790     }
 791     return ret;
 792 }
 793
 794
 795 /**********************************************************************
 796  *          PolyPolygon (GDI.450)
 797  */
 798 BOOL16 WINAPI PolyPolygon16( HDC16 hdc, const POINT16* pt, const INT16* counts,
 799                              UINT16 polygons )
 800 {
 801     int         i,nrpts;
 802     LPPOINT     pt32;
 803     LPINT       counts32;
 804     BOOL16      ret;
 805
 806     nrpts=0;
 807     for (i=polygons;i--;)
 808         nrpts+=counts[i];
 809     pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0, sizeof(POINT)*nrpts);
 810     if(pt32 == NULL) return FALSE;
 811     for (i=nrpts;i--;)
 812         CONV_POINT16TO32(&(pt[i]),&(pt32[i]));
 813     counts32 = (LPINT)HeapAlloc( GetProcessHeap(), 0, polygons*sizeof(INT) );
 814     if(counts32 == NULL) {
 815         HeapFree( GetProcessHeap(), 0, pt32 );
 816         return FALSE;
 817     }
 818     for (i=polygons;i--;) counts32[i]=counts[i];
 819
 820     ret = PolyPolygon(hdc,pt32,counts32,polygons);
 821     HeapFree( GetProcessHeap(), 0, counts32 );
 822     HeapFree( GetProcessHeap(), 0, pt32 );
 823     return ret;
 824 }
 825
 826 /**********************************************************************
 827  *          PolyPolygon  (GDI32.@)
 828  */
 829 BOOL WINAPI PolyPolygon( HDC hdc, const POINT* pt, const INT* counts,
 830                              UINT polygons )
 831 {
 832     BOOL ret = FALSE;
 833     DC * dc = DC_GetDCUpdate( hdc );
 834     if (dc)
 835     {
 836         if (PATH_IsPathOpen(dc->path)) ret = PATH_PolyPolygon(dc, pt, counts, polygons);
 837         else if (dc->funcs->pPolyPolygon) ret = dc->funcs->pPolyPolygon(dc,pt,counts,polygons);
 838         GDI_ReleaseObj( hdc );
 839     }
 840     return ret;
 841 }
 842
 843 /**********************************************************************
 844  *          PolyPolyline  (GDI32.@)
 845  */
 846 BOOL WINAPI PolyPolyline( HDC hdc, const POINT* pt, const DWORD* counts,
 847                             DWORD polylines )
 848 {
 849     BOOL ret = FALSE;
 850     DC * dc = DC_GetDCUpdate( hdc );
 851     if (dc)
 852     {
 853         if (PATH_IsPathOpen(dc->path)) ret = PATH_PolyPolyline(dc, pt, counts, polylines);
 854         else if (dc->funcs->pPolyPolyline) ret = dc->funcs->pPolyPolyline(dc,pt,counts,polylines);
 855         GDI_ReleaseObj( hdc );
 856     }
 857     return ret;
 858 }
 859
 860 /**********************************************************************
 861  *          ExtFloodFill   (GDI.372)
 862  */
 863 BOOL16 WINAPI ExtFloodFill16( HDC16 hdc, INT16 x, INT16 y, COLORREF color,
 864                               UINT16 fillType )
 865 {
 866     return ExtFloodFill( hdc, x, y, color, fillType );
 867 }
 868
 869
 870 /**********************************************************************
 871  *          ExtFloodFill   (GDI32.@)
 872  */
 873 BOOL WINAPI ExtFloodFill( HDC hdc, INT x, INT y, COLORREF color,
 874                               UINT fillType )
 875 {
 876     BOOL ret = FALSE;
 877     DC * dc = DC_GetDCUpdate( hdc );
 878     if (dc)
 879     {
 880         if (dc->funcs->pExtFloodFill) ret = dc->funcs->pExtFloodFill(dc,x,y,color,fillType);
 881         GDI_ReleaseObj( hdc );
 882     }
 883     return ret;
 884 }
 885
 886
 887 /**********************************************************************
 888  *          FloodFill   (GDI.25)
 889  */
 890 BOOL16 WINAPI FloodFill16( HDC16 hdc, INT16 x, INT16 y, COLORREF color )
 891 {
 892     return ExtFloodFill( hdc, x, y, color, FLOODFILLBORDER );
 893 }
 894
 895
 896 /**********************************************************************
 897  *          FloodFill   (GDI32.@)
 898  */
 899 BOOL WINAPI FloodFill( HDC hdc, INT x, INT y, COLORREF color )
 900 {
 901     return ExtFloodFill( hdc, x, y, color, FLOODFILLBORDER );
 902 }
 903
 904
 905 /******************************************************************************
 906  * PolyBezier [GDI.502]
 907  */
 908 BOOL16 WINAPI PolyBezier16( HDC16 hDc, const POINT16* lppt, INT16 cPoints )
 909 {
 910     int i;
 911     BOOL16 ret;
 912     LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
 913                                            cPoints*sizeof(POINT) );
 914     if(!pt32) return FALSE;
 915     for (i=cPoints;i--;) CONV_POINT16TO32(&(lppt[i]),&(pt32[i]));
 916     ret= PolyBezier(hDc, pt32, cPoints);
 917     HeapFree( GetProcessHeap(), 0, pt32 );
 918     return ret;
 919 }
 920
 921 /******************************************************************************
 922  * PolyBezierTo [GDI.503]
 923  */
 924 BOOL16 WINAPI PolyBezierTo16( HDC16 hDc, const POINT16* lppt, INT16 cPoints )
 925 {
 926     int i;
 927     BOOL16 ret;
 928     LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
 929                                            cPoints*sizeof(POINT) );
 930     if(!pt32) return FALSE;
 931     for (i=cPoints;i--;) CONV_POINT16TO32(&(lppt[i]),&(pt32[i]));
 932     ret= PolyBezierTo(hDc, pt32, cPoints);
 933     HeapFree( GetProcessHeap(), 0, pt32 );
 934     return ret;
 935 }
 936
 937 /******************************************************************************
 938  * PolyBezier [GDI32.@]
 939  * Draws one or more Bezier curves
 940  *
 941  * PARAMS
 942  *    hDc     [I] Handle to device context
 943  *    lppt    [I] Pointer to endpoints and control points
 944  *    cPoints [I] Count of endpoints and control points
 945  *
 946  * RETURNS STD
 947  */
 948 BOOL WINAPI PolyBezier( HDC hdc, const POINT* lppt, DWORD cPoints )
 949 {
 950     BOOL ret = FALSE;
 951     DC * dc = DC_GetDCUpdate( hdc );
 952
 953     if(!dc) return FALSE;
 954
 955     if(PATH_IsPathOpen(dc->path))
 956         ret = PATH_PolyBezier(dc, lppt, cPoints);
 957     else if (dc->funcs->pPolyBezier)
 958         ret = dc->funcs->pPolyBezier(dc, lppt, cPoints);
 959     else  /* We'll convert it into line segments and draw them using Polyline */
 960     {
 961         POINT *Pts;
 962         INT nOut;
 963
 964         if ((Pts = GDI_Bezier( lppt, cPoints, &nOut )))
 965         {
 966             TRACE("Pts = %p, no = %d\n", Pts, nOut);
 967             ret = Polyline( dc->hSelf, Pts, nOut );
 968             HeapFree( GetProcessHeap(), 0, Pts );
 969         }
 970     }
 971
 972     GDI_ReleaseObj( hdc );
 973     return ret;
 974 }
 975
 976 /******************************************************************************
 977  * PolyBezierTo [GDI32.@]
 978  * Draws one or more Bezier curves
 979  *
 980  * PARAMS
 981  *    hDc     [I] Handle to device context
 982  *    lppt    [I] Pointer to endpoints and control points
 983  *    cPoints [I] Count of endpoints and control points
 984  *
 985  * RETURNS STD
 986  */
 987 BOOL WINAPI PolyBezierTo( HDC hdc, const POINT* lppt, DWORD cPoints )
 988 {
 989     DC * dc = DC_GetDCUpdate( hdc );
 990     BOOL ret;
 991
 992     if(!dc) return FALSE;
 993
 994     if(PATH_IsPathOpen(dc->path))
 995         ret = PATH_PolyBezierTo(dc, lppt, cPoints);
 996     else if(dc->funcs->pPolyBezierTo)
 997         ret = dc->funcs->pPolyBezierTo(dc, lppt, cPoints);
 998     else { /* We'll do it using PolyBezier */
 999         POINT *pt;
1000         pt = HeapAlloc( GetProcessHeap(), 0, sizeof(POINT) * (cPoints + 1) );
1001         if(!pt) return FALSE;
1002         pt[0].x = dc->CursPosX;
1003         pt[0].y = dc->CursPosY;
1004         memcpy(pt + 1, lppt, sizeof(POINT) * cPoints);
1005         ret = PolyBezier(dc->hSelf, pt, cPoints+1);
1006         HeapFree( GetProcessHeap(), 0, pt );
1007     }
1008     if(ret) {
1009         dc->CursPosX = lppt[cPoints-1].x;
1010         dc->CursPosY = lppt[cPoints-1].y;
1011     }
1012     GDI_ReleaseObj( hdc );
1013     return ret;
1014 }
1015
1016 /***********************************************************************
1017  *      AngleArc (GDI32.@)
1018  */
1019 BOOL WINAPI AngleArc(HDC hdc, INT x, INT y, DWORD dwRadius, FLOAT eStartAngle, FLOAT eSweepAngle)
1020 {
1021     INT x1,y1,x2,y2, arcdir;
1022     BOOL result;
1023     DC *dc;
1024
1025     if( (signed int)dwRadius < 0 )
1026         return FALSE;
1027
1028     dc = DC_GetDCUpdate( hdc );
1029     if(!dc) return FALSE;
1030
1031     if(dc->funcs->pAngleArc)
1032     {
1033         result = dc->funcs->pAngleArc( dc, x, y, dwRadius, eStartAngle, eSweepAngle );
1034
1035         GDI_ReleaseObj( hdc );
1036         return result;
1037     }
1038     GDI_ReleaseObj( hdc );
1039
1040     /* AngleArc always works counterclockwise */
1041     arcdir = GetArcDirection( hdc );
1042     SetArcDirection( hdc, AD_COUNTERCLOCKWISE );
1043
1044     x1 = x + cos(eStartAngle*M_PI/180) * dwRadius;
1045     y1 = y - sin(eStartAngle*M_PI/180) * dwRadius;
1046     x2 = x + cos((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius;
1047     y2 = x - sin((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius;
1048
1049     LineTo( hdc, x1, y1 );
1050     if( eSweepAngle >= 0 )
1051         result = Arc( hdc, x-dwRadius, y-dwRadius, x+dwRadius, y+dwRadius,
1052                       x1, y1, x2, y2 );
1053     else
1054         result = Arc( hdc, x-dwRadius, y-dwRadius, x+dwRadius, y+dwRadius,
1055                       x2, y2, x1, y1 );
1056
1057     if( result ) MoveToEx( hdc, x2, y2, NULL );
1058     SetArcDirection( hdc, arcdir );
1059     return result;
1060 }
1061
1062 /***********************************************************************
1063  *      PolyDraw (GDI32.@)
1064  */
1065 BOOL WINAPI PolyDraw(HDC hdc, const POINT *lppt, const BYTE *lpbTypes,
1066                        DWORD cCount)
1067 {
1068     DC *dc;
1069     BOOL result;
1070     POINT lastmove;
1071     int i;
1072
1073     dc = DC_GetDCUpdate( hdc );
1074     if(!dc) return FALSE;
1075
1076     if(dc->funcs->pPolyDraw)
1077     {
1078         result = dc->funcs->pPolyDraw( dc, lppt, lpbTypes, cCount );
1079         GDI_ReleaseObj( hdc );
1080         return result;
1081     }
1082     GDI_ReleaseObj( hdc );
1083
1084     /* check for each bezierto if there are two more points */
1085     for( i = 0; i < cCount; i++ )
1086         if( lpbTypes[i] != PT_MOVETO &&
1087             lpbTypes[i] & PT_BEZIERTO )
1088         {
1089             if( cCount < i+3 )
1090                 return FALSE;
1091             else
1092                 i += 2;
1093         }
1094
1095     /* if no moveto occurs, we will close the figure here */
1096     lastmove.x = dc->CursPosX;
1097     lastmove.y = dc->CursPosY;
1098
1099     /* now let's draw */
1100     for( i = 0; i < cCount; i++ )
1101     {
1102         if( lpbTypes[i] == PT_MOVETO )
1103         {
1104             MoveToEx( hdc, lppt[i].x, lppt[i].y, NULL );
1105             lastmove.x = dc->CursPosX;
1106             lastmove.y = dc->CursPosY;
1107         }
1108         else if( lpbTypes[i] & PT_LINETO )
1109             LineTo( hdc, lppt[i].x, lppt[i].y );
1110         else if( lpbTypes[i] & PT_BEZIERTO )
1111         {
1112             PolyBezierTo( hdc, &lppt[i], 3 );
1113             i += 2;
1114         }
1115         else
1116             return FALSE;
1117
1118         if( lpbTypes[i] & PT_CLOSEFIGURE )
1119         {
1120             if( PATH_IsPathOpen( dc->path ) )
1121                 CloseFigure( hdc );
1122             else
1123                 LineTo( hdc, lastmove.x, lastmove.y );
1124         }
1125     }
1126
1127     return TRUE;
1128 }
1129
1130 /******************************************************************
1131  *
1132  *   *Very* simple bezier drawing code,
1133  *
1134  *   It uses a recursive algorithm to divide the curve in a series
1135  *   of straight line segements. Not ideal but for me sufficient.
1136  *   If you are in need for something better look for some incremental
1137  *   algorithm.
1138  *
1139  *   7 July 1998 Rein Klazes
1140  */
1141
1142  /*
1143   * some macro definitions for bezier drawing
1144   *
1145   * to avoid trucation errors the coordinates are
1146   * shifted upwards. When used in drawing they are
1147   * shifted down again, including correct rounding
1148   * and avoiding floating point arithmatic
1149   * 4 bits should allow 27 bits coordinates which I saw
1150   * somewere in the win32 doc's
1151   *
1152   */
1153
1154 #define BEZIERSHIFTBITS 4
1155 #define BEZIERSHIFTUP(x)    ((x)<<BEZIERSHIFTBITS)
1156 #define BEZIERPIXEL        BEZIERSHIFTUP(1)
1157 #define BEZIERSHIFTDOWN(x)  (((x)+(1<<(BEZIERSHIFTBITS-1)))>>BEZIERSHIFTBITS)
1158 /* maximum depth of recursion */
1159 #define BEZIERMAXDEPTH  8
1160
1161 /* size of array to store points on */
1162 /* enough for one curve */
1163 #define BEZIER_INITBUFSIZE    (150)
1164
1165 /* calculate Bezier average, in this case the middle
1166  * correctly rounded...
1167  * */
1168
1169 #define BEZIERMIDDLE(Mid, P1, P2) \
1170     (Mid).x=((P1).x+(P2).x + 1)/2;\
1171     (Mid).y=((P1).y+(P2).y + 1)/2;
1172
1173 /**********************************************************
1174 * BezierCheck helper function to check
1175 * that recursion can be terminated
1176 *       Points[0] and Points[3] are begin and endpoint
1177 *       Points[1] and Points[2] are control points
1178 *       level is the recursion depth
1179 *       returns true if the recusion can be terminated
1180 */
1181 static BOOL BezierCheck( int level, POINT *Points)
1182 {
1183     INT dx, dy;
1184     dx=Points[3].x-Points[0].x;
1185     dy=Points[3].y-Points[0].y;
1186     if(abs(dy)<=abs(dx)){/* shallow line */
1187         /* check that control points are between begin and end */
1188         if(Points[1].x < Points[0].x){
1189             if(Points[1].x < Points[3].x)
1190                 return FALSE;
1191         }else
1192             if(Points[1].x > Points[3].x)
1193                 return FALSE;
1194         if(Points[2].x < Points[0].x){
1195             if(Points[2].x < Points[3].x)
1196                 return FALSE;
1197         }else
1198             if(Points[2].x > Points[3].x)
1199                 return FALSE;
1200         dx=BEZIERSHIFTDOWN(dx);
1201         if(!dx) return TRUE;
1202         if(abs(Points[1].y-Points[0].y-(dy/dx)*
1203                 BEZIERSHIFTDOWN(Points[1].x-Points[0].x)) > BEZIERPIXEL ||
1204            abs(Points[2].y-Points[0].y-(dy/dx)*
1205                    BEZIERSHIFTDOWN(Points[2].x-Points[0].x)) > BEZIERPIXEL )
1206             return FALSE;
1207         else
1208             return TRUE;
1209     }else{ /* steep line */
1210         /* check that control points are between begin and end */
1211         if(Points[1].y < Points[0].y){
1212             if(Points[1].y < Points[3].y)
1213                 return FALSE;
1214         }else
1215             if(Points[1].y > Points[3].y)
1216                 return FALSE;
1217         if(Points[2].y < Points[0].y){
1218             if(Points[2].y < Points[3].y)
1219                 return FALSE;
1220         }else
1221             if(Points[2].y > Points[3].y)
1222                 return FALSE;
1223         dy=BEZIERSHIFTDOWN(dy);
1224         if(!dy) return TRUE;
1225         if(abs(Points[1].x-Points[0].x-(dx/dy)*
1226                 BEZIERSHIFTDOWN(Points[1].y-Points[0].y)) > BEZIERPIXEL ||
1227            abs(Points[2].x-Points[0].x-(dx/dy)*
1228                    BEZIERSHIFTDOWN(Points[2].y-Points[0].y)) > BEZIERPIXEL )
1229             return FALSE;
1230         else
1231             return TRUE;
1232     }
1233 }
1234
1235 /* Helper for GDI_Bezier.
1236  * Just handles one Bezier, so Points should point to four POINTs
1237  */
1238 static void GDI_InternalBezier( POINT *Points, POINT **PtsOut, INT *dwOut,
1239                                 INT *nPtsOut, INT level )
1240 {
1241     if(*nPtsOut == *dwOut) {
1242         *dwOut *= 2;
1243         *PtsOut = HeapReAlloc( GetProcessHeap(), 0, *PtsOut,
1244                                *dwOut * sizeof(POINT) );
1245     }
1246
1247     if(!level || BezierCheck(level, Points)) {
1248         if(*nPtsOut == 0) {
1249             (*PtsOut)[0].x = BEZIERSHIFTDOWN(Points[0].x);
1250             (*PtsOut)[0].y = BEZIERSHIFTDOWN(Points[0].y);
1251             *nPtsOut = 1;
1252         }
1253         (*PtsOut)[*nPtsOut].x = BEZIERSHIFTDOWN(Points[3].x);
1254         (*PtsOut)[*nPtsOut].y = BEZIERSHIFTDOWN(Points[3].y);
1255         (*nPtsOut) ++;
1256     } else {
1257         POINT Points2[4]; /* for the second recursive call */
1258         Points2[3]=Points[3];
1259         BEZIERMIDDLE(Points2[2], Points[2], Points[3]);
1260         BEZIERMIDDLE(Points2[0], Points[1], Points[2]);
1261         BEZIERMIDDLE(Points2[1],Points2[0],Points2[2]);
1262
1263         BEZIERMIDDLE(Points[1], Points[0],  Points[1]);
1264         BEZIERMIDDLE(Points[2], Points[1], Points2[0]);
1265         BEZIERMIDDLE(Points[3], Points[2], Points2[1]);
1266
1267         Points2[0]=Points[3];
1268
1269         /* do the two halves */
1270         GDI_InternalBezier(Points, PtsOut, dwOut, nPtsOut, level-1);
1271         GDI_InternalBezier(Points2, PtsOut, dwOut, nPtsOut, level-1);
1272     }
1273 }
1274
1275
1276
1277 /***********************************************************************
1278  *           GDI_Bezier   [INTERNAL]
1279  *   Calculate line segments that approximate -what microsoft calls- a bezier
1280  *   curve.
1281  *   The routine recursively divides the curve in two parts until a straight
1282  *   line can be drawn
1283  *
1284  *  PARAMS
1285  *
1286  *  Points  [I] Ptr to count POINTs which are the end and control points
1287  *              of the set of Bezier curves to flatten.
1288  *  count   [I] Number of Points.  Must be 3n+1.
1289  *  nPtsOut [O] Will contain no of points that have been produced (i.e. no. of
1290  *              lines+1).
1291  *
1292  *  RETURNS
1293  *
1294  *  Ptr to an array of POINTs that contain the lines that approximinate the
1295  *  Beziers.  The array is allocated on the process heap and it is the caller's
1296  *  responsibility to HeapFree it. [this is not a particularly nice interface
1297  *  but since we can't know in advance how many points will generate, the
1298  *  alternative would be to call the function twice, once to determine the size
1299  *  and a second time to do the work - I decided this was too much of a pain].
1300  */
1301 POINT *GDI_Bezier( const POINT *Points, INT count, INT *nPtsOut )
1302 {
1303     POINT *out;
1304     INT Bezier, dwOut = BEZIER_INITBUFSIZE, i;
1305
1306     if((count - 1) % 3 != 0) {
1307         ERR("Invalid no. of points\n");
1308         return NULL;
1309     }
1310     *nPtsOut = 0;
1311     out = HeapAlloc( GetProcessHeap(), 0, dwOut * sizeof(POINT));
1312     for(Bezier = 0; Bezier < (count-1)/3; Bezier++) {
1313         POINT ptBuf[4];
1314         memcpy(ptBuf, Points + Bezier * 3, sizeof(POINT) * 4);
1315         for(i = 0; i < 4; i++) {
1316             ptBuf[i].x = BEZIERSHIFTUP(ptBuf[i].x);
1317             ptBuf[i].y = BEZIERSHIFTUP(ptBuf[i].y);
1318         }
1319         GDI_InternalBezier( ptBuf, &out, &dwOut, nPtsOut, BEZIERMAXDEPTH );
1320     }
1321     TRACE("Produced %d points\n", *nPtsOut);
1322     return out;
1323 }