dlls/gdi32/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  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <stdarg.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include "windef.h"
  31 #include "winbase.h"
  32 #include "wingdi.h"
  33 #include "winerror.h"
  34 #include "gdi_private.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(gdi);
  38
  39
  40 /***********************************************************************
  41  *           null driver fallback implementations
  42  */
  43
  44 BOOL nulldrv_AngleArc( PHYSDEV dev, INT x, INT y, DWORD radius, FLOAT start, FLOAT sweep )
  45 {
  46     INT x1 = GDI_ROUND( x + cos( start * M_PI / 180 ) * radius );
  47     INT y1 = GDI_ROUND( y - sin( start * M_PI / 180 ) * radius );
  48     INT x2 = GDI_ROUND( x + cos( (start + sweep) * M_PI / 180) * radius );
  49     INT y2 = GDI_ROUND( y - sin( (start + sweep) * M_PI / 180) * radius );
  50     INT arcdir = SetArcDirection( dev->hdc, sweep >= 0 ? AD_COUNTERCLOCKWISE : AD_CLOCKWISE );
  51     BOOL ret = ArcTo( dev->hdc, x - radius, y - radius, x + radius, y + radius, x1, y1, x2, y2 );
  52     SetArcDirection( dev->hdc, arcdir );
  53     return ret;
  54 }
  55
  56 BOOL nulldrv_ArcTo( PHYSDEV dev, INT left, INT top, INT right, INT bottom,
  57                     INT xstart, INT ystart, INT xend, INT yend )
  58 {
  59     INT width = abs( right - left );
  60     INT height = abs( bottom - top );
  61     double xradius = width / 2.0;
  62     double yradius = height / 2.0;
  63     double xcenter = right > left ? left + xradius : right + xradius;
  64     double ycenter = bottom > top ? top + yradius : bottom + yradius;
  65     double angle;
  66
  67     if (!height || !width) return FALSE;
  68     /* draw a line from the current position to the starting point of the arc, then draw the arc */
  69     angle = atan2( (ystart - ycenter) / height, (xstart - xcenter) / width );
  70     LineTo( dev->hdc, GDI_ROUND( xcenter + cos(angle) * xradius ),
  71             GDI_ROUND( ycenter + sin(angle) * yradius ));
  72     return Arc( dev->hdc, left, top, right, bottom, xstart, ystart, xend, yend );
  73 }
  74
  75 BOOL nulldrv_FillRgn( PHYSDEV dev, HRGN rgn, HBRUSH brush )
  76 {
  77     BOOL ret = FALSE;
  78     HBRUSH prev;
  79
  80     if ((prev = SelectObject( dev->hdc, brush )))
  81     {
  82         ret = PaintRgn( dev->hdc, rgn );
  83         SelectObject( dev->hdc, prev );
  84     }
  85     return ret;
  86 }
  87
  88 BOOL nulldrv_FrameRgn( PHYSDEV dev, HRGN rgn, HBRUSH brush, INT width, INT height )
  89 {
  90     BOOL ret = FALSE;
  91     HRGN tmp = CreateRectRgn( 0, 0, 0, 0 );
  92
  93     if (tmp)
  94     {
  95         if (REGION_FrameRgn( tmp, rgn, width, height )) ret = FillRgn( dev->hdc, tmp, brush );
  96         DeleteObject( tmp );
  97     }
  98     return ret;
  99 }
 100
 101 BOOL nulldrv_InvertRgn( PHYSDEV dev, HRGN rgn )
 102 {
 103     HBRUSH prev_brush = SelectObject( dev->hdc, GetStockObject(BLACK_BRUSH) );
 104     INT prev_rop = SetROP2( dev->hdc, R2_NOT );
 105     BOOL ret = PaintRgn( dev->hdc, rgn );
 106     SelectObject( dev->hdc, prev_brush );
 107     SetROP2( dev->hdc, prev_rop );
 108     return ret;
 109 }
 110
 111 BOOL nulldrv_PolyBezier( PHYSDEV dev, const POINT *points, DWORD count )
 112 {
 113     BOOL ret = FALSE;
 114     POINT *pts;
 115     INT n;
 116
 117     if ((pts = GDI_Bezier( points, count, &n )))
 118     {
 119         ret = Polyline( dev->hdc, pts, n );
 120         HeapFree( GetProcessHeap(), 0, pts );
 121     }
 122     return ret;
 123 }
 124
 125 BOOL nulldrv_PolyBezierTo( PHYSDEV dev, const POINT *points, DWORD count )
 126 {
 127     BOOL ret = FALSE;
 128     POINT *pts = HeapAlloc( GetProcessHeap(), 0, sizeof(POINT) * (count + 1) );
 129
 130     if (pts)
 131     {
 132         GetCurrentPositionEx( dev->hdc, &pts[0] );
 133         memcpy( pts + 1, points, sizeof(POINT) * count );
 134         ret = PolyBezier( dev->hdc, pts, count + 1 );
 135         HeapFree( GetProcessHeap(), 0, pts );
 136     }
 137     return ret;
 138 }
 139
 140 BOOL nulldrv_PolyDraw( PHYSDEV dev, const POINT *points, const BYTE *types, DWORD count )
 141 {
 142     POINT *line_pts = NULL, *bzr_pts = NULL, bzr[4];
 143     INT i, num_pts, num_bzr_pts, space, size;
 144
 145     /* check for valid point types */
 146     for (i = 0; i < count; i++)
 147     {
 148         switch (types[i])
 149         {
 150         case PT_MOVETO:
 151         case PT_LINETO | PT_CLOSEFIGURE:
 152         case PT_LINETO:
 153             break;
 154         case PT_BEZIERTO:
 155             if((i + 2 < count) && (types[i + 1] == PT_BEZIERTO) &&
 156                ((types[i + 2] & ~PT_CLOSEFIGURE) == PT_BEZIERTO))
 157             {
 158                 i += 2;
 159                 break;
 160             }
 161         default:
 162             return FALSE;
 163         }
 164     }
 165
 166     space = count + 300;
 167     line_pts = HeapAlloc( GetProcessHeap(), 0, space * sizeof(POINT) );
 168     num_pts = 1;
 169
 170     GetCurrentPositionEx( dev->hdc, &line_pts[0] );
 171     for (i = 0; i < count; i++)
 172     {
 173         switch (types[i])
 174         {
 175         case PT_MOVETO:
 176             if (num_pts >= 2) Polyline( dev->hdc, line_pts, num_pts );
 177             num_pts = 0;
 178             line_pts[num_pts++] = points[i];
 179             break;
 180         case PT_LINETO:
 181         case (PT_LINETO | PT_CLOSEFIGURE):
 182             line_pts[num_pts++] = points[i];
 183             break;
 184         case PT_BEZIERTO:
 185             bzr[0].x = line_pts[num_pts - 1].x;
 186             bzr[0].y = line_pts[num_pts - 1].y;
 187             memcpy( &bzr[1], &points[i], 3 * sizeof(POINT) );
 188
 189             if ((bzr_pts = GDI_Bezier( bzr, 4, &num_bzr_pts )))
 190             {
 191                 size = num_pts + (count - i) + num_bzr_pts;
 192                 if (space < size)
 193                 {
 194                     space = size * 2;
 195                     line_pts = HeapReAlloc( GetProcessHeap(), 0, line_pts, space * sizeof(POINT) );
 196                 }
 197                 memcpy( &line_pts[num_pts], &bzr_pts[1], (num_bzr_pts - 1) * sizeof(POINT) );
 198                 num_pts += num_bzr_pts - 1;
 199                 HeapFree( GetProcessHeap(), 0, bzr_pts );
 200             }
 201             i += 2;
 202             break;
 203         }
 204         if (types[i] & PT_CLOSEFIGURE) line_pts[num_pts++] = line_pts[0];
 205     }
 206
 207     if (num_pts >= 2) Polyline( dev->hdc, line_pts, num_pts );
 208     MoveToEx( dev->hdc, line_pts[num_pts - 1].x, line_pts[num_pts - 1].y, NULL );
 209     HeapFree( GetProcessHeap(), 0, line_pts );
 210     return TRUE;
 211 }
 212
 213 BOOL nulldrv_PolylineTo( PHYSDEV dev, const POINT *points, INT count )
 214 {
 215     BOOL ret = FALSE;
 216     POINT *pts;
 217
 218     if (!count) return FALSE;
 219     if ((pts = HeapAlloc( GetProcessHeap(), 0, sizeof(POINT) * (count + 1) )))
 220     {
 221         GetCurrentPositionEx( dev->hdc, &pts[0] );
 222         memcpy( pts + 1, points, sizeof(POINT) * count );
 223         ret = Polyline( dev->hdc, pts, count + 1 );
 224         HeapFree( GetProcessHeap(), 0, pts );
 225     }
 226     return ret;
 227 }
 228
 229 /***********************************************************************
 230  *           LineTo    (GDI32.@)
 231  */
 232 BOOL WINAPI LineTo( HDC hdc, INT x, INT y )
 233 {
 234     DC * dc = get_dc_ptr( hdc );
 235     PHYSDEV physdev;
 236     BOOL ret;
 237
 238     if(!dc) return FALSE;
 239
 240     update_dc( dc );
 241     physdev = GET_DC_PHYSDEV( dc, pLineTo );
 242     ret = physdev->funcs->pLineTo( physdev, x, y );
 243
 244     if(ret) {
 245         dc->CursPosX = x;
 246         dc->CursPosY = y;
 247     }
 248     release_dc_ptr( dc );
 249     return ret;
 250 }
 251
 252
 253 /***********************************************************************
 254  *           MoveToEx    (GDI32.@)
 255  */
 256 BOOL WINAPI MoveToEx( HDC hdc, INT x, INT y, LPPOINT pt )
 257 {
 258     BOOL ret;
 259     PHYSDEV physdev;
 260     DC * dc = get_dc_ptr( hdc );
 261
 262     if(!dc) return FALSE;
 263
 264     if(pt) {
 265         pt->x = dc->CursPosX;
 266         pt->y = dc->CursPosY;
 267     }
 268     dc->CursPosX = x;
 269     dc->CursPosY = y;
 270
 271     physdev = GET_DC_PHYSDEV( dc, pMoveTo );
 272     ret = physdev->funcs->pMoveTo( physdev, x, y );
 273     release_dc_ptr( dc );
 274     return ret;
 275 }
 276
 277
 278 /***********************************************************************
 279  *           Arc    (GDI32.@)
 280  */
 281 BOOL WINAPI Arc( HDC hdc, INT left, INT top, INT right,
 282                      INT bottom, INT xstart, INT ystart,
 283                      INT xend, INT yend )
 284 {
 285     BOOL ret = FALSE;
 286     DC * dc = get_dc_ptr( hdc );
 287
 288     if (dc)
 289     {
 290         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pArc );
 291         update_dc( dc );
 292         ret = physdev->funcs->pArc( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
 293         release_dc_ptr( dc );
 294     }
 295     return ret;
 296 }
 297
 298 /***********************************************************************
 299  *           ArcTo    (GDI32.@)
 300  */
 301 BOOL WINAPI ArcTo( HDC hdc,
 302                      INT left,   INT top,
 303                      INT right,  INT bottom,
 304                      INT xstart, INT ystart,
 305                      INT xend,   INT yend )
 306 {
 307     double width = fabs(right-left),
 308         height = fabs(bottom-top),
 309         xradius = width/2,
 310         yradius = height/2,
 311         xcenter = right > left ? left+xradius : right+xradius,
 312         ycenter = bottom > top ? top+yradius : bottom+yradius,
 313         angle;
 314     PHYSDEV physdev;
 315     BOOL result;
 316     DC * dc = get_dc_ptr( hdc );
 317     if(!dc) return FALSE;
 318
 319     update_dc( dc );
 320     physdev = GET_DC_PHYSDEV( dc, pArcTo );
 321     result = physdev->funcs->pArcTo( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
 322
 323     if (result) {
 324         angle = atan2(((yend-ycenter)/height),
 325                       ((xend-xcenter)/width));
 326         dc->CursPosX = GDI_ROUND(xcenter+(cos(angle)*xradius));
 327         dc->CursPosY = GDI_ROUND(ycenter+(sin(angle)*yradius));
 328     }
 329     release_dc_ptr( dc );
 330     return result;
 331 }
 332
 333
 334 /***********************************************************************
 335  *           Pie   (GDI32.@)
 336  */
 337 BOOL WINAPI Pie( HDC hdc, INT left, INT top,
 338                      INT right, INT bottom, INT xstart, INT ystart,
 339                      INT xend, INT yend )
 340 {
 341     BOOL ret;
 342     PHYSDEV physdev;
 343     DC * dc = get_dc_ptr( hdc );
 344     if (!dc) return FALSE;
 345
 346     update_dc( dc );
 347     physdev = GET_DC_PHYSDEV( dc, pPie );
 348     ret = physdev->funcs->pPie( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
 349     release_dc_ptr( dc );
 350     return ret;
 351 }
 352
 353
 354 /***********************************************************************
 355  *           Chord    (GDI32.@)
 356  */
 357 BOOL WINAPI Chord( HDC hdc, INT left, INT top,
 358                        INT right, INT bottom, INT xstart, INT ystart,
 359                        INT xend, INT yend )
 360 {
 361     BOOL ret;
 362     PHYSDEV physdev;
 363     DC * dc = get_dc_ptr( hdc );
 364     if (!dc) return FALSE;
 365
 366     update_dc( dc );
 367     physdev = GET_DC_PHYSDEV( dc, pChord );
 368     ret = physdev->funcs->pChord( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
 369     release_dc_ptr( dc );
 370     return ret;
 371 }
 372
 373
 374 /***********************************************************************
 375  *           Ellipse    (GDI32.@)
 376  */
 377 BOOL WINAPI Ellipse( HDC hdc, INT left, INT top,
 378                          INT right, INT bottom )
 379 {
 380     BOOL ret;
 381     PHYSDEV physdev;
 382     DC * dc = get_dc_ptr( hdc );
 383     if (!dc) return FALSE;
 384
 385     update_dc( dc );
 386     physdev = GET_DC_PHYSDEV( dc, pEllipse );
 387     ret = physdev->funcs->pEllipse( physdev, left, top, right, bottom );
 388     release_dc_ptr( dc );
 389     return ret;
 390 }
 391
 392
 393 /***********************************************************************
 394  *           Rectangle    (GDI32.@)
 395  */
 396 BOOL WINAPI Rectangle( HDC hdc, INT left, INT top,
 397                            INT right, INT bottom )
 398 {
 399     BOOL ret = FALSE;
 400     DC * dc = get_dc_ptr( hdc );
 401
 402     if (dc)
 403     {
 404         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pRectangle );
 405         update_dc( dc );
 406         ret = physdev->funcs->pRectangle( physdev, left, top, right, bottom );
 407         release_dc_ptr( dc );
 408     }
 409     return ret;
 410 }
 411
 412
 413 /***********************************************************************
 414  *           RoundRect    (GDI32.@)
 415  */
 416 BOOL WINAPI RoundRect( HDC hdc, INT left, INT top, INT right,
 417                            INT bottom, INT ell_width, INT ell_height )
 418 {
 419     BOOL ret = FALSE;
 420     DC *dc = get_dc_ptr( hdc );
 421
 422     if (dc)
 423     {
 424         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pRoundRect );
 425         update_dc( dc );
 426         ret = physdev->funcs->pRoundRect( physdev, left, top, right, bottom, ell_width, ell_height );
 427         release_dc_ptr( dc );
 428     }
 429     return ret;
 430 }
 431
 432 /***********************************************************************
 433  *           SetPixel    (GDI32.@)
 434  */
 435 COLORREF WINAPI SetPixel( HDC hdc, INT x, INT y, COLORREF color )
 436 {
 437     COLORREF ret = 0;
 438     DC * dc = get_dc_ptr( hdc );
 439
 440     if (dc)
 441     {
 442         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSetPixel );
 443         update_dc( dc );
 444         ret = physdev->funcs->pSetPixel( physdev, x, y, color );
 445         release_dc_ptr( dc );
 446     }
 447     return ret;
 448 }
 449
 450 /***********************************************************************
 451  *           SetPixelV    (GDI32.@)
 452  */
 453 BOOL WINAPI SetPixelV( HDC hdc, INT x, INT y, COLORREF color )
 454 {
 455     BOOL ret = FALSE;
 456     DC * dc = get_dc_ptr( hdc );
 457
 458     if (dc)
 459     {
 460         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSetPixel );
 461         update_dc( dc );
 462         physdev->funcs->pSetPixel( physdev, x, y, color );
 463         ret = TRUE;
 464         release_dc_ptr( dc );
 465     }
 466     return ret;
 467 }
 468
 469 /***********************************************************************
 470  *           GetPixel    (GDI32.@)
 471  */
 472 COLORREF WINAPI GetPixel( HDC hdc, INT x, INT y )
 473 {
 474     COLORREF ret = CLR_INVALID;
 475     DC * dc = get_dc_ptr( hdc );
 476
 477     if (dc)
 478     {
 479         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pGetPixel );
 480         update_dc( dc );
 481         ret = physdev->funcs->pGetPixel( physdev, x, y );
 482         release_dc_ptr( dc );
 483     }
 484     return ret;
 485 }
 486
 487
 488 /******************************************************************************
 489  * GdiSetPixelFormat [GDI32.@]
 490  *
 491  * Probably not the correct semantics, it's supposed to be an internal backend for SetPixelFormat.
 492  */
 493 BOOL WINAPI GdiSetPixelFormat( HDC hdc, INT iPixelFormat, const PIXELFORMATDESCRIPTOR *ppfd)
 494 {
 495     INT bRet = FALSE;
 496     DC * dc = get_dc_ptr( hdc );
 497
 498     TRACE("(%p,%d,%p)\n",hdc,iPixelFormat,ppfd);
 499
 500     if (dc)
 501     {
 502         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSetPixelFormat );
 503         update_dc( dc );
 504         bRet = physdev->funcs->pSetPixelFormat( physdev, iPixelFormat, ppfd );
 505         release_dc_ptr( dc );
 506     }
 507     return bRet;
 508 }
 509
 510
 511 /******************************************************************************
 512  * GdiDescribePixelFormat [GDI32.@]
 513  *
 514  * Probably not the correct semantics, it's supposed to be an internal backend for DescribePixelFormat.
 515  */
 516 INT WINAPI GdiDescribePixelFormat( HDC hdc, INT iPixelFormat, UINT nBytes,
 517                                    LPPIXELFORMATDESCRIPTOR ppfd )
 518 {
 519     INT ret = 0;
 520     DC * dc = get_dc_ptr( hdc );
 521
 522     TRACE("(%p,%d,%d,%p): stub\n",hdc,iPixelFormat,nBytes,ppfd);
 523
 524     if (dc)
 525     {
 526         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pDescribePixelFormat );
 527         update_dc( dc );
 528         ret = physdev->funcs->pDescribePixelFormat( physdev, iPixelFormat, nBytes, ppfd );
 529         release_dc_ptr( dc );
 530     }
 531     return ret;
 532 }
 533
 534
 535 /******************************************************************************
 536  * GdiSwapBuffers [GDI32.@]
 537  *
 538  * Probably not the correct semantics, it's supposed to be an internal backend for SwapBuffers.
 539  */
 540 BOOL WINAPI GdiSwapBuffers( HDC hdc )
 541 {
 542     INT bRet = FALSE;
 543     DC * dc = get_dc_ptr( hdc );
 544
 545     TRACE("(%p)\n",hdc);
 546
 547     if (dc)
 548     {
 549         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSwapBuffers );
 550         update_dc( dc );
 551         bRet = physdev->funcs->pSwapBuffers( physdev );
 552         release_dc_ptr( dc );
 553     }
 554     return bRet;
 555 }
 556
 557
 558 /***********************************************************************
 559  *           PaintRgn    (GDI32.@)
 560  */
 561 BOOL WINAPI PaintRgn( HDC hdc, HRGN hrgn )
 562 {
 563     BOOL ret = FALSE;
 564     DC * dc = get_dc_ptr( hdc );
 565
 566     if (dc)
 567     {
 568         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPaintRgn );
 569         update_dc( dc );
 570         ret = physdev->funcs->pPaintRgn( physdev, hrgn );
 571         release_dc_ptr( dc );
 572     }
 573     return ret;
 574 }
 575
 576
 577 /***********************************************************************
 578  *           FillRgn    (GDI32.@)
 579  */
 580 BOOL WINAPI FillRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush )
 581 {
 582     BOOL retval = FALSE;
 583     DC * dc = get_dc_ptr( hdc );
 584
 585     if (dc)
 586     {
 587         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pFillRgn );
 588         update_dc( dc );
 589         retval = physdev->funcs->pFillRgn( physdev, hrgn, hbrush );
 590         release_dc_ptr( dc );
 591     }
 592     return retval;
 593 }
 594
 595
 596 /***********************************************************************
 597  *           FrameRgn     (GDI32.@)
 598  */
 599 BOOL WINAPI FrameRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush,
 600                           INT nWidth, INT nHeight )
 601 {
 602     BOOL ret = FALSE;
 603     DC *dc = get_dc_ptr( hdc );
 604
 605     if (dc)
 606     {
 607         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pFrameRgn );
 608         update_dc( dc );
 609         ret = physdev->funcs->pFrameRgn( physdev, hrgn, hbrush, nWidth, nHeight );
 610         release_dc_ptr( dc );
 611     }
 612     return ret;
 613 }
 614
 615
 616 /***********************************************************************
 617  *           InvertRgn    (GDI32.@)
 618  */
 619 BOOL WINAPI InvertRgn( HDC hdc, HRGN hrgn )
 620 {
 621     BOOL ret = FALSE;
 622     DC *dc = get_dc_ptr( hdc );
 623
 624     if (dc)
 625     {
 626         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pInvertRgn );
 627         update_dc( dc );
 628         ret = physdev->funcs->pInvertRgn( physdev, hrgn );
 629         release_dc_ptr( dc );
 630     }
 631     return ret;
 632 }
 633
 634
 635 /**********************************************************************
 636  *          Polyline   (GDI32.@)
 637  */
 638 BOOL WINAPI Polyline( HDC hdc, const POINT* pt, INT count )
 639 {
 640     BOOL ret = FALSE;
 641     DC * dc = get_dc_ptr( hdc );
 642
 643     if (dc)
 644     {
 645         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolyline );
 646         update_dc( dc );
 647         ret = physdev->funcs->pPolyline( physdev, pt, count );
 648         release_dc_ptr( dc );
 649     }
 650     return ret;
 651 }
 652
 653 /**********************************************************************
 654  *          PolylineTo   (GDI32.@)
 655  */
 656 BOOL WINAPI PolylineTo( HDC hdc, const POINT* pt, DWORD cCount )
 657 {
 658     DC * dc = get_dc_ptr( hdc );
 659     PHYSDEV physdev;
 660     BOOL ret;
 661
 662     if(!dc) return FALSE;
 663
 664     update_dc( dc );
 665     physdev = GET_DC_PHYSDEV( dc, pPolylineTo );
 666     ret = physdev->funcs->pPolylineTo( physdev, pt, cCount );
 667
 668     if (ret && cCount)
 669     {
 670         dc->CursPosX = pt[cCount-1].x;
 671         dc->CursPosY = pt[cCount-1].y;
 672     }
 673     release_dc_ptr( dc );
 674     return ret;
 675 }
 676
 677
 678 /**********************************************************************
 679  *          Polygon  (GDI32.@)
 680  */
 681 BOOL WINAPI Polygon( HDC hdc, const POINT* pt, INT count )
 682 {
 683     BOOL ret = FALSE;
 684     DC * dc = get_dc_ptr( hdc );
 685
 686     if (dc)
 687     {
 688         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolygon );
 689         update_dc( dc );
 690         ret = physdev->funcs->pPolygon( physdev, pt, count );
 691         release_dc_ptr( dc );
 692     }
 693     return ret;
 694 }
 695
 696
 697 /**********************************************************************
 698  *          PolyPolygon  (GDI32.@)
 699  */
 700 BOOL WINAPI PolyPolygon( HDC hdc, const POINT* pt, const INT* counts,
 701                              UINT polygons )
 702 {
 703     BOOL ret = FALSE;
 704     DC * dc = get_dc_ptr( hdc );
 705
 706     if (dc)
 707     {
 708         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolyPolygon );
 709         update_dc( dc );
 710         ret = physdev->funcs->pPolyPolygon( physdev, pt, counts, polygons );
 711         release_dc_ptr( dc );
 712     }
 713     return ret;
 714 }
 715
 716 /**********************************************************************
 717  *          PolyPolyline  (GDI32.@)
 718  */
 719 BOOL WINAPI PolyPolyline( HDC hdc, const POINT* pt, const DWORD* counts,
 720                             DWORD polylines )
 721 {
 722     BOOL ret = FALSE;
 723     DC * dc = get_dc_ptr( hdc );
 724
 725     if (dc)
 726     {
 727         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolyPolyline );
 728         update_dc( dc );
 729         ret = physdev->funcs->pPolyPolyline( physdev, pt, counts, polylines );
 730         release_dc_ptr( dc );
 731     }
 732     return ret;
 733 }
 734
 735 /**********************************************************************
 736  *          ExtFloodFill   (GDI32.@)
 737  */
 738 BOOL WINAPI ExtFloodFill( HDC hdc, INT x, INT y, COLORREF color,
 739                               UINT fillType )
 740 {
 741     BOOL ret = FALSE;
 742     DC * dc = get_dc_ptr( hdc );
 743
 744     if (dc)
 745     {
 746         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pExtFloodFill );
 747
 748         update_dc( dc );
 749         ret = physdev->funcs->pExtFloodFill( physdev, x, y, color, fillType );
 750         release_dc_ptr( dc );
 751     }
 752     return ret;
 753 }
 754
 755
 756 /**********************************************************************
 757  *          FloodFill   (GDI32.@)
 758  */
 759 BOOL WINAPI FloodFill( HDC hdc, INT x, INT y, COLORREF color )
 760 {
 761     return ExtFloodFill( hdc, x, y, color, FLOODFILLBORDER );
 762 }
 763
 764
 765 /******************************************************************************
 766  * PolyBezier [GDI32.@]
 767  * Draws one or more Bezier curves
 768  *
 769  * PARAMS
 770  *    hDc     [I] Handle to device context
 771  *    lppt    [I] Pointer to endpoints and control points
 772  *    cPoints [I] Count of endpoints and control points
 773  *
 774  * RETURNS
 775  *    Success: TRUE
 776  *    Failure: FALSE
 777  */
 778 BOOL WINAPI PolyBezier( HDC hdc, const POINT* lppt, DWORD cPoints )
 779 {
 780     PHYSDEV physdev;
 781     BOOL ret;
 782     DC * dc;
 783
 784     /* cPoints must be 3 * n + 1 (where n>=1) */
 785     if (cPoints == 1 || (cPoints % 3) != 1) return FALSE;
 786
 787     dc = get_dc_ptr( hdc );
 788     if(!dc) return FALSE;
 789
 790     update_dc( dc );
 791     physdev = GET_DC_PHYSDEV( dc, pPolyBezier );
 792     ret = physdev->funcs->pPolyBezier( physdev, lppt, cPoints );
 793     release_dc_ptr( dc );
 794     return ret;
 795 }
 796
 797 /******************************************************************************
 798  * PolyBezierTo [GDI32.@]
 799  * Draws one or more Bezier curves
 800  *
 801  * PARAMS
 802  *    hDc     [I] Handle to device context
 803  *    lppt    [I] Pointer to endpoints and control points
 804  *    cPoints [I] Count of endpoints and control points
 805  *
 806  * RETURNS
 807  *    Success: TRUE
 808  *    Failure: FALSE
 809  */
 810 BOOL WINAPI PolyBezierTo( HDC hdc, const POINT* lppt, DWORD cPoints )
 811 {
 812     DC * dc;
 813     BOOL ret;
 814     PHYSDEV physdev;
 815
 816     /* cbPoints must be 3 * n (where n>=1) */
 817     if (!cPoints || (cPoints % 3) != 0) return FALSE;
 818
 819     dc = get_dc_ptr( hdc );
 820     if(!dc) return FALSE;
 821
 822     update_dc( dc );
 823     physdev = GET_DC_PHYSDEV( dc, pPolyBezierTo );
 824     ret = physdev->funcs->pPolyBezierTo( physdev, lppt, cPoints );
 825
 826     if(ret) {
 827         dc->CursPosX = lppt[cPoints-1].x;
 828         dc->CursPosY = lppt[cPoints-1].y;
 829     }
 830     release_dc_ptr( dc );
 831     return ret;
 832 }
 833
 834 /***********************************************************************
 835  *      AngleArc (GDI32.@)
 836  */
 837 BOOL WINAPI AngleArc(HDC hdc, INT x, INT y, DWORD dwRadius, FLOAT eStartAngle, FLOAT eSweepAngle)
 838 {
 839     PHYSDEV physdev;
 840     BOOL result;
 841     DC *dc;
 842
 843     if( (signed int)dwRadius < 0 )
 844         return FALSE;
 845
 846     dc = get_dc_ptr( hdc );
 847     if(!dc) return FALSE;
 848
 849     update_dc( dc );
 850     physdev = GET_DC_PHYSDEV( dc, pAngleArc );
 851     result = physdev->funcs->pAngleArc( physdev, x, y, dwRadius, eStartAngle, eSweepAngle );
 852
 853     if (result) {
 854         dc->CursPosX = GDI_ROUND( x + cos((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius );
 855         dc->CursPosY = GDI_ROUND( y - sin((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius );
 856     }
 857     release_dc_ptr( dc );
 858     return result;
 859 }
 860
 861 /***********************************************************************
 862  *      PolyDraw (GDI32.@)
 863  */
 864 BOOL WINAPI PolyDraw(HDC hdc, const POINT *lppt, const BYTE *lpbTypes,
 865                        DWORD cCount)
 866 {
 867     DC *dc = get_dc_ptr( hdc );
 868     PHYSDEV physdev;
 869     BOOL result;
 870
 871     if(!dc) return FALSE;
 872
 873     update_dc( dc );
 874     physdev = GET_DC_PHYSDEV( dc, pPolyDraw );
 875     result = physdev->funcs->pPolyDraw( physdev, lppt, lpbTypes, cCount );
 876     release_dc_ptr( dc );
 877     return result;
 878 }
 879
 880
 881 /**********************************************************************
 882  *           LineDDA   (GDI32.@)
 883  */
 884 BOOL WINAPI LineDDA(INT nXStart, INT nYStart, INT nXEnd, INT nYEnd,
 885                     LINEDDAPROC callback, LPARAM lParam )
 886 {
 887     INT xadd = 1, yadd = 1;
 888     INT err,erradd;
 889     INT cnt;
 890     INT dx = nXEnd - nXStart;
 891     INT dy = nYEnd - nYStart;
 892
 893     if (dx < 0)
 894     {
 895         dx = -dx;
 896         xadd = -1;
 897     }
 898     if (dy < 0)
 899     {
 900         dy = -dy;
 901         yadd = -1;
 902     }
 903     if (dx > dy)  /* line is "more horizontal" */
 904     {
 905         err = 2*dy - dx; erradd = 2*dy - 2*dx;
 906         for(cnt = 0;cnt < dx; cnt++)
 907         {
 908             callback(nXStart,nYStart,lParam);
 909             if (err > 0)
 910             {
 911                 nYStart += yadd;
 912                 err += erradd;
 913             }
 914             else err += 2*dy;
 915             nXStart += xadd;
 916         }
 917     }
 918     else   /* line is "more vertical" */
 919     {
 920         err = 2*dx - dy; erradd = 2*dx - 2*dy;
 921         for(cnt = 0;cnt < dy; cnt++)
 922         {
 923             callback(nXStart,nYStart,lParam);
 924             if (err > 0)
 925             {
 926                 nXStart += xadd;
 927                 err += erradd;
 928             }
 929             else err += 2*dx;
 930             nYStart += yadd;
 931         }
 932     }
 933     return TRUE;
 934 }
 935
 936
 937 /******************************************************************
 938  *
 939  *   *Very* simple bezier drawing code,
 940  *
 941  *   It uses a recursive algorithm to divide the curve in a series
 942  *   of straight line segments. Not ideal but sufficient for me.
 943  *   If you are in need for something better look for some incremental
 944  *   algorithm.
 945  *
 946  *   7 July 1998 Rein Klazes
 947  */
 948
 949  /*
 950   * some macro definitions for bezier drawing
 951   *
 952   * to avoid truncation errors the coordinates are
 953   * shifted upwards. When used in drawing they are
 954   * shifted down again, including correct rounding
 955   * and avoiding floating point arithmetic
 956   * 4 bits should allow 27 bits coordinates which I saw
 957   * somewhere in the win32 doc's
 958   *
 959   */
 960
 961 #define BEZIERSHIFTBITS 4
 962 #define BEZIERSHIFTUP(x)    ((x)<<BEZIERSHIFTBITS)
 963 #define BEZIERPIXEL        BEZIERSHIFTUP(1)
 964 #define BEZIERSHIFTDOWN(x)  (((x)+(1<<(BEZIERSHIFTBITS-1)))>>BEZIERSHIFTBITS)
 965 /* maximum depth of recursion */
 966 #define BEZIERMAXDEPTH  8
 967
 968 /* size of array to store points on */
 969 /* enough for one curve */
 970 #define BEZIER_INITBUFSIZE    (150)
 971
 972 /* calculate Bezier average, in this case the middle
 973  * correctly rounded...
 974  * */
 975
 976 #define BEZIERMIDDLE(Mid, P1, P2) \
 977     (Mid).x=((P1).x+(P2).x + 1)/2;\
 978     (Mid).y=((P1).y+(P2).y + 1)/2;
 979
 980 /**********************************************************
 981 * BezierCheck helper function to check
 982 * that recursion can be terminated
 983 *       Points[0] and Points[3] are begin and endpoint
 984 *       Points[1] and Points[2] are control points
 985 *       level is the recursion depth
 986 *       returns true if the recursion can be terminated
 987 */
 988 static BOOL BezierCheck( int level, POINT *Points)
 989 {
 990     INT dx, dy;
 991     dx=Points[3].x-Points[0].x;
 992     dy=Points[3].y-Points[0].y;
 993     if(abs(dy)<=abs(dx)){/* shallow line */
 994         /* check that control points are between begin and end */
 995         if(Points[1].x < Points[0].x){
 996             if(Points[1].x < Points[3].x)
 997                 return FALSE;
 998         }else
 999             if(Points[1].x > Points[3].x)
1000                 return FALSE;
1001         if(Points[2].x < Points[0].x){
1002             if(Points[2].x < Points[3].x)
1003                 return FALSE;
1004         }else
1005             if(Points[2].x > Points[3].x)
1006                 return FALSE;
1007         dx=BEZIERSHIFTDOWN(dx);
1008         if(!dx) return TRUE;
1009         if(abs(Points[1].y-Points[0].y-(dy/dx)*
1010                 BEZIERSHIFTDOWN(Points[1].x-Points[0].x)) > BEZIERPIXEL ||
1011            abs(Points[2].y-Points[0].y-(dy/dx)*
1012                    BEZIERSHIFTDOWN(Points[2].x-Points[0].x)) > BEZIERPIXEL )
1013             return FALSE;
1014         else
1015             return TRUE;
1016     }else{ /* steep line */
1017         /* check that control points are between begin and end */
1018         if(Points[1].y < Points[0].y){
1019             if(Points[1].y < Points[3].y)
1020                 return FALSE;
1021         }else
1022             if(Points[1].y > Points[3].y)
1023                 return FALSE;
1024         if(Points[2].y < Points[0].y){
1025             if(Points[2].y < Points[3].y)
1026                 return FALSE;
1027         }else
1028             if(Points[2].y > Points[3].y)
1029                 return FALSE;
1030         dy=BEZIERSHIFTDOWN(dy);
1031         if(!dy) return TRUE;
1032         if(abs(Points[1].x-Points[0].x-(dx/dy)*
1033                 BEZIERSHIFTDOWN(Points[1].y-Points[0].y)) > BEZIERPIXEL ||
1034            abs(Points[2].x-Points[0].x-(dx/dy)*
1035                    BEZIERSHIFTDOWN(Points[2].y-Points[0].y)) > BEZIERPIXEL )
1036             return FALSE;
1037         else
1038             return TRUE;
1039     }
1040 }
1041
1042 /* Helper for GDI_Bezier.
1043  * Just handles one Bezier, so Points should point to four POINTs
1044  */
1045 static void GDI_InternalBezier( POINT *Points, POINT **PtsOut, INT *dwOut,
1046                                 INT *nPtsOut, INT level )
1047 {
1048     if(*nPtsOut == *dwOut) {
1049         *dwOut *= 2;
1050         *PtsOut = HeapReAlloc( GetProcessHeap(), 0, *PtsOut,
1051                                *dwOut * sizeof(POINT) );
1052     }
1053
1054     if(!level || BezierCheck(level, Points)) {
1055         if(*nPtsOut == 0) {
1056             (*PtsOut)[0].x = BEZIERSHIFTDOWN(Points[0].x);
1057             (*PtsOut)[0].y = BEZIERSHIFTDOWN(Points[0].y);
1058             *nPtsOut = 1;
1059         }
1060         (*PtsOut)[*nPtsOut].x = BEZIERSHIFTDOWN(Points[3].x);
1061         (*PtsOut)[*nPtsOut].y = BEZIERSHIFTDOWN(Points[3].y);
1062         (*nPtsOut) ++;
1063     } else {
1064         POINT Points2[4]; /* for the second recursive call */
1065         Points2[3]=Points[3];
1066         BEZIERMIDDLE(Points2[2], Points[2], Points[3]);
1067         BEZIERMIDDLE(Points2[0], Points[1], Points[2]);
1068         BEZIERMIDDLE(Points2[1],Points2[0],Points2[2]);
1069
1070         BEZIERMIDDLE(Points[1], Points[0],  Points[1]);
1071         BEZIERMIDDLE(Points[2], Points[1], Points2[0]);
1072         BEZIERMIDDLE(Points[3], Points[2], Points2[1]);
1073
1074         Points2[0]=Points[3];
1075
1076         /* do the two halves */
1077         GDI_InternalBezier(Points, PtsOut, dwOut, nPtsOut, level-1);
1078         GDI_InternalBezier(Points2, PtsOut, dwOut, nPtsOut, level-1);
1079     }
1080 }
1081
1082
1083
1084 /***********************************************************************
1085  *           GDI_Bezier   [INTERNAL]
1086  *   Calculate line segments that approximate -what microsoft calls- a bezier
1087  *   curve.
1088  *   The routine recursively divides the curve in two parts until a straight
1089  *   line can be drawn
1090  *
1091  *  PARAMS
1092  *
1093  *  Points  [I] Ptr to count POINTs which are the end and control points
1094  *              of the set of Bezier curves to flatten.
1095  *  count   [I] Number of Points.  Must be 3n+1.
1096  *  nPtsOut [O] Will contain no of points that have been produced (i.e. no. of
1097  *              lines+1).
1098  *
1099  *  RETURNS
1100  *
1101  *  Ptr to an array of POINTs that contain the lines that approximate the
1102  *  Beziers.  The array is allocated on the process heap and it is the caller's
1103  *  responsibility to HeapFree it. [this is not a particularly nice interface
1104  *  but since we can't know in advance how many points we will generate, the
1105  *  alternative would be to call the function twice, once to determine the size
1106  *  and a second time to do the work - I decided this was too much of a pain].
1107  */
1108 POINT *GDI_Bezier( const POINT *Points, INT count, INT *nPtsOut )
1109 {
1110     POINT *out;
1111     INT Bezier, dwOut = BEZIER_INITBUFSIZE, i;
1112
1113     if (count == 1 || (count - 1) % 3 != 0) {
1114         ERR("Invalid no. of points %d\n", count);
1115         return NULL;
1116     }
1117     *nPtsOut = 0;
1118     out = HeapAlloc( GetProcessHeap(), 0, dwOut * sizeof(POINT));
1119     for(Bezier = 0; Bezier < (count-1)/3; Bezier++) {
1120         POINT ptBuf[4];
1121         memcpy(ptBuf, Points + Bezier * 3, sizeof(POINT) * 4);
1122         for(i = 0; i < 4; i++) {
1123             ptBuf[i].x = BEZIERSHIFTUP(ptBuf[i].x);
1124             ptBuf[i].y = BEZIERSHIFTUP(ptBuf[i].y);
1125         }
1126         GDI_InternalBezier( ptBuf, &out, &dwOut, nPtsOut, BEZIERMAXDEPTH );
1127     }
1128     TRACE("Produced %d points\n", *nPtsOut);
1129     return out;
1130 }
1131
1132 /******************************************************************************
1133  *           GdiGradientFill   (GDI32.@)
1134  */
1135 BOOL WINAPI GdiGradientFill( HDC hdc, TRIVERTEX *vert_array, ULONG nvert,
1136                              void *grad_array, ULONG ngrad, ULONG mode )
1137 {
1138     DC *dc;
1139     PHYSDEV physdev;
1140     BOOL ret;
1141     ULONG i;
1142
1143     TRACE("%p vert_array:%p nvert:%d grad_array:%p ngrad:%d\n", hdc, vert_array, nvert, grad_array, ngrad);
1144
1145     if (!vert_array || !nvert || !grad_array || !ngrad || mode > GRADIENT_FILL_TRIANGLE)
1146     {
1147         SetLastError( ERROR_INVALID_PARAMETER );
1148         return FALSE;
1149     }
1150     for (i = 0; i < ngrad * (mode == GRADIENT_FILL_TRIANGLE ? 3 : 2); i++)
1151         if (((ULONG *)grad_array)[i] >= nvert) return FALSE;
1152
1153     if (!(dc = get_dc_ptr( hdc )))
1154     {
1155         SetLastError( ERROR_INVALID_PARAMETER );
1156         return FALSE;
1157     }
1158     update_dc( dc );
1159     physdev = GET_DC_PHYSDEV( dc, pGradientFill );
1160     ret = physdev->funcs->pGradientFill( physdev, vert_array, nvert, grad_array, ngrad, mode );
1161     release_dc_ptr( dc );
1162     return ret;
1163 }
1164
1165 /******************************************************************************
1166  *           GdiDrawStream   (GDI32.@)
1167  *
1168  */
1169 BOOL WINAPI GdiDrawStream( HDC hdc, ULONG in, void * pvin )
1170 {
1171     FIXME("stub: %p, %d, %p\n", hdc, in, pvin);
1172     return FALSE;
1173 }