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 format, const PIXELFORMATDESCRIPTOR *descr )
 494 {
 495     DC *dc;
 496     BOOL ret = TRUE;
 497
 498     TRACE("(%p,%d,%p)\n", hdc, format, descr);
 499
 500     if (!(dc = get_dc_ptr( hdc ))) return FALSE;
 501
 502     if (!dc->pixel_format) dc->pixel_format = format;
 503     else ret = (dc->pixel_format == format);
 504     release_dc_ptr( dc );
 505     return ret;
 506 }
 507
 508
 509 /******************************************************************************
 510  * GdiDescribePixelFormat [GDI32.@]
 511  *
 512  * Probably not the correct semantics, it's supposed to be an internal backend for DescribePixelFormat.
 513  */
 514 INT WINAPI GdiDescribePixelFormat( HDC hdc, INT format, UINT size, PIXELFORMATDESCRIPTOR *descr )
 515 {
 516     FIXME( "(%p,%d,%d,%p): stub\n", hdc, format, size, descr );
 517     return 0;
 518 }
 519
 520
 521 /******************************************************************************
 522  * GdiSwapBuffers [GDI32.@]
 523  *
 524  * Probably not the correct semantics, it's supposed to be an internal backend for SwapBuffers.
 525  */
 526 BOOL WINAPI GdiSwapBuffers( HDC hdc )
 527 {
 528     INT bRet = FALSE;
 529     DC * dc = get_dc_ptr( hdc );
 530
 531     TRACE("(%p)\n",hdc);
 532
 533     if (dc)
 534     {
 535         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pSwapBuffers );
 536         update_dc( dc );
 537         bRet = physdev->funcs->pSwapBuffers( physdev );
 538         release_dc_ptr( dc );
 539     }
 540     return bRet;
 541 }
 542
 543
 544 /***********************************************************************
 545  *           PaintRgn    (GDI32.@)
 546  */
 547 BOOL WINAPI PaintRgn( HDC hdc, HRGN hrgn )
 548 {
 549     BOOL ret = FALSE;
 550     DC * dc = get_dc_ptr( hdc );
 551
 552     if (dc)
 553     {
 554         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPaintRgn );
 555         update_dc( dc );
 556         ret = physdev->funcs->pPaintRgn( physdev, hrgn );
 557         release_dc_ptr( dc );
 558     }
 559     return ret;
 560 }
 561
 562
 563 /***********************************************************************
 564  *           FillRgn    (GDI32.@)
 565  */
 566 BOOL WINAPI FillRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush )
 567 {
 568     BOOL retval = FALSE;
 569     DC * dc = get_dc_ptr( hdc );
 570
 571     if (dc)
 572     {
 573         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pFillRgn );
 574         update_dc( dc );
 575         retval = physdev->funcs->pFillRgn( physdev, hrgn, hbrush );
 576         release_dc_ptr( dc );
 577     }
 578     return retval;
 579 }
 580
 581
 582 /***********************************************************************
 583  *           FrameRgn     (GDI32.@)
 584  */
 585 BOOL WINAPI FrameRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush,
 586                           INT nWidth, INT nHeight )
 587 {
 588     BOOL ret = FALSE;
 589     DC *dc = get_dc_ptr( hdc );
 590
 591     if (dc)
 592     {
 593         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pFrameRgn );
 594         update_dc( dc );
 595         ret = physdev->funcs->pFrameRgn( physdev, hrgn, hbrush, nWidth, nHeight );
 596         release_dc_ptr( dc );
 597     }
 598     return ret;
 599 }
 600
 601
 602 /***********************************************************************
 603  *           InvertRgn    (GDI32.@)
 604  */
 605 BOOL WINAPI InvertRgn( HDC hdc, HRGN hrgn )
 606 {
 607     BOOL ret = FALSE;
 608     DC *dc = get_dc_ptr( hdc );
 609
 610     if (dc)
 611     {
 612         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pInvertRgn );
 613         update_dc( dc );
 614         ret = physdev->funcs->pInvertRgn( physdev, hrgn );
 615         release_dc_ptr( dc );
 616     }
 617     return ret;
 618 }
 619
 620
 621 /**********************************************************************
 622  *          Polyline   (GDI32.@)
 623  */
 624 BOOL WINAPI Polyline( HDC hdc, const POINT* pt, INT count )
 625 {
 626     BOOL ret = FALSE;
 627     DC * dc = get_dc_ptr( hdc );
 628
 629     if (dc)
 630     {
 631         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolyline );
 632         update_dc( dc );
 633         ret = physdev->funcs->pPolyline( physdev, pt, count );
 634         release_dc_ptr( dc );
 635     }
 636     return ret;
 637 }
 638
 639 /**********************************************************************
 640  *          PolylineTo   (GDI32.@)
 641  */
 642 BOOL WINAPI PolylineTo( HDC hdc, const POINT* pt, DWORD cCount )
 643 {
 644     DC * dc = get_dc_ptr( hdc );
 645     PHYSDEV physdev;
 646     BOOL ret;
 647
 648     if(!dc) return FALSE;
 649
 650     update_dc( dc );
 651     physdev = GET_DC_PHYSDEV( dc, pPolylineTo );
 652     ret = physdev->funcs->pPolylineTo( physdev, pt, cCount );
 653
 654     if (ret && cCount)
 655     {
 656         dc->CursPosX = pt[cCount-1].x;
 657         dc->CursPosY = pt[cCount-1].y;
 658     }
 659     release_dc_ptr( dc );
 660     return ret;
 661 }
 662
 663
 664 /**********************************************************************
 665  *          Polygon  (GDI32.@)
 666  */
 667 BOOL WINAPI Polygon( HDC hdc, const POINT* pt, INT count )
 668 {
 669     BOOL ret = FALSE;
 670     DC * dc = get_dc_ptr( hdc );
 671
 672     if (dc)
 673     {
 674         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolygon );
 675         update_dc( dc );
 676         ret = physdev->funcs->pPolygon( physdev, pt, count );
 677         release_dc_ptr( dc );
 678     }
 679     return ret;
 680 }
 681
 682
 683 /**********************************************************************
 684  *          PolyPolygon  (GDI32.@)
 685  */
 686 BOOL WINAPI PolyPolygon( HDC hdc, const POINT* pt, const INT* counts,
 687                              UINT polygons )
 688 {
 689     BOOL ret = FALSE;
 690     DC * dc = get_dc_ptr( hdc );
 691
 692     if (dc)
 693     {
 694         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolyPolygon );
 695         update_dc( dc );
 696         ret = physdev->funcs->pPolyPolygon( physdev, pt, counts, polygons );
 697         release_dc_ptr( dc );
 698     }
 699     return ret;
 700 }
 701
 702 /**********************************************************************
 703  *          PolyPolyline  (GDI32.@)
 704  */
 705 BOOL WINAPI PolyPolyline( HDC hdc, const POINT* pt, const DWORD* counts,
 706                             DWORD polylines )
 707 {
 708     BOOL ret = FALSE;
 709     DC * dc = get_dc_ptr( hdc );
 710
 711     if (dc)
 712     {
 713         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pPolyPolyline );
 714         update_dc( dc );
 715         ret = physdev->funcs->pPolyPolyline( physdev, pt, counts, polylines );
 716         release_dc_ptr( dc );
 717     }
 718     return ret;
 719 }
 720
 721 /**********************************************************************
 722  *          ExtFloodFill   (GDI32.@)
 723  */
 724 BOOL WINAPI ExtFloodFill( HDC hdc, INT x, INT y, COLORREF color,
 725                               UINT fillType )
 726 {
 727     BOOL ret = FALSE;
 728     DC * dc = get_dc_ptr( hdc );
 729
 730     if (dc)
 731     {
 732         PHYSDEV physdev = GET_DC_PHYSDEV( dc, pExtFloodFill );
 733
 734         update_dc( dc );
 735         ret = physdev->funcs->pExtFloodFill( physdev, x, y, color, fillType );
 736         release_dc_ptr( dc );
 737     }
 738     return ret;
 739 }
 740
 741
 742 /**********************************************************************
 743  *          FloodFill   (GDI32.@)
 744  */
 745 BOOL WINAPI FloodFill( HDC hdc, INT x, INT y, COLORREF color )
 746 {
 747     return ExtFloodFill( hdc, x, y, color, FLOODFILLBORDER );
 748 }
 749
 750
 751 /******************************************************************************
 752  * PolyBezier [GDI32.@]
 753  * Draws one or more Bezier curves
 754  *
 755  * PARAMS
 756  *    hDc     [I] Handle to device context
 757  *    lppt    [I] Pointer to endpoints and control points
 758  *    cPoints [I] Count of endpoints and control points
 759  *
 760  * RETURNS
 761  *    Success: TRUE
 762  *    Failure: FALSE
 763  */
 764 BOOL WINAPI PolyBezier( HDC hdc, const POINT* lppt, DWORD cPoints )
 765 {
 766     PHYSDEV physdev;
 767     BOOL ret;
 768     DC * dc;
 769
 770     /* cPoints must be 3 * n + 1 (where n>=1) */
 771     if (cPoints == 1 || (cPoints % 3) != 1) return FALSE;
 772
 773     dc = get_dc_ptr( hdc );
 774     if(!dc) return FALSE;
 775
 776     update_dc( dc );
 777     physdev = GET_DC_PHYSDEV( dc, pPolyBezier );
 778     ret = physdev->funcs->pPolyBezier( physdev, lppt, cPoints );
 779     release_dc_ptr( dc );
 780     return ret;
 781 }
 782
 783 /******************************************************************************
 784  * PolyBezierTo [GDI32.@]
 785  * Draws one or more Bezier curves
 786  *
 787  * PARAMS
 788  *    hDc     [I] Handle to device context
 789  *    lppt    [I] Pointer to endpoints and control points
 790  *    cPoints [I] Count of endpoints and control points
 791  *
 792  * RETURNS
 793  *    Success: TRUE
 794  *    Failure: FALSE
 795  */
 796 BOOL WINAPI PolyBezierTo( HDC hdc, const POINT* lppt, DWORD cPoints )
 797 {
 798     DC * dc;
 799     BOOL ret;
 800     PHYSDEV physdev;
 801
 802     /* cbPoints must be 3 * n (where n>=1) */
 803     if (!cPoints || (cPoints % 3) != 0) return FALSE;
 804
 805     dc = get_dc_ptr( hdc );
 806     if(!dc) return FALSE;
 807
 808     update_dc( dc );
 809     physdev = GET_DC_PHYSDEV( dc, pPolyBezierTo );
 810     ret = physdev->funcs->pPolyBezierTo( physdev, lppt, cPoints );
 811
 812     if(ret) {
 813         dc->CursPosX = lppt[cPoints-1].x;
 814         dc->CursPosY = lppt[cPoints-1].y;
 815     }
 816     release_dc_ptr( dc );
 817     return ret;
 818 }
 819
 820 /***********************************************************************
 821  *      AngleArc (GDI32.@)
 822  */
 823 BOOL WINAPI AngleArc(HDC hdc, INT x, INT y, DWORD dwRadius, FLOAT eStartAngle, FLOAT eSweepAngle)
 824 {
 825     PHYSDEV physdev;
 826     BOOL result;
 827     DC *dc;
 828
 829     if( (signed int)dwRadius < 0 )
 830         return FALSE;
 831
 832     dc = get_dc_ptr( hdc );
 833     if(!dc) return FALSE;
 834
 835     update_dc( dc );
 836     physdev = GET_DC_PHYSDEV( dc, pAngleArc );
 837     result = physdev->funcs->pAngleArc( physdev, x, y, dwRadius, eStartAngle, eSweepAngle );
 838
 839     if (result) {
 840         dc->CursPosX = GDI_ROUND( x + cos((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius );
 841         dc->CursPosY = GDI_ROUND( y - sin((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius );
 842     }
 843     release_dc_ptr( dc );
 844     return result;
 845 }
 846
 847 /***********************************************************************
 848  *      PolyDraw (GDI32.@)
 849  */
 850 BOOL WINAPI PolyDraw(HDC hdc, const POINT *lppt, const BYTE *lpbTypes,
 851                        DWORD cCount)
 852 {
 853     DC *dc = get_dc_ptr( hdc );
 854     PHYSDEV physdev;
 855     BOOL result;
 856
 857     if(!dc) return FALSE;
 858
 859     update_dc( dc );
 860     physdev = GET_DC_PHYSDEV( dc, pPolyDraw );
 861     result = physdev->funcs->pPolyDraw( physdev, lppt, lpbTypes, cCount );
 862     release_dc_ptr( dc );
 863     return result;
 864 }
 865
 866
 867 /**********************************************************************
 868  *           LineDDA   (GDI32.@)
 869  */
 870 BOOL WINAPI LineDDA(INT nXStart, INT nYStart, INT nXEnd, INT nYEnd,
 871                     LINEDDAPROC callback, LPARAM lParam )
 872 {
 873     INT xadd = 1, yadd = 1;
 874     INT err,erradd;
 875     INT cnt;
 876     INT dx = nXEnd - nXStart;
 877     INT dy = nYEnd - nYStart;
 878
 879     if (dx < 0)
 880     {
 881         dx = -dx;
 882         xadd = -1;
 883     }
 884     if (dy < 0)
 885     {
 886         dy = -dy;
 887         yadd = -1;
 888     }
 889     if (dx > dy)  /* line is "more horizontal" */
 890     {
 891         err = 2*dy - dx; erradd = 2*dy - 2*dx;
 892         for(cnt = 0;cnt < dx; cnt++)
 893         {
 894             callback(nXStart,nYStart,lParam);
 895             if (err > 0)
 896             {
 897                 nYStart += yadd;
 898                 err += erradd;
 899             }
 900             else err += 2*dy;
 901             nXStart += xadd;
 902         }
 903     }
 904     else   /* line is "more vertical" */
 905     {
 906         err = 2*dx - dy; erradd = 2*dx - 2*dy;
 907         for(cnt = 0;cnt < dy; cnt++)
 908         {
 909             callback(nXStart,nYStart,lParam);
 910             if (err > 0)
 911             {
 912                 nXStart += xadd;
 913                 err += erradd;
 914             }
 915             else err += 2*dx;
 916             nYStart += yadd;
 917         }
 918     }
 919     return TRUE;
 920 }
 921
 922
 923 /******************************************************************
 924  *
 925  *   *Very* simple bezier drawing code,
 926  *
 927  *   It uses a recursive algorithm to divide the curve in a series
 928  *   of straight line segments. Not ideal but sufficient for me.
 929  *   If you are in need for something better look for some incremental
 930  *   algorithm.
 931  *
 932  *   7 July 1998 Rein Klazes
 933  */
 934
 935  /*
 936   * some macro definitions for bezier drawing
 937   *
 938   * to avoid truncation errors the coordinates are
 939   * shifted upwards. When used in drawing they are
 940   * shifted down again, including correct rounding
 941   * and avoiding floating point arithmetic
 942   * 4 bits should allow 27 bits coordinates which I saw
 943   * somewhere in the win32 doc's
 944   *
 945   */
 946
 947 #define BEZIERSHIFTBITS 4
 948 #define BEZIERSHIFTUP(x)    ((x)<<BEZIERSHIFTBITS)
 949 #define BEZIERPIXEL        BEZIERSHIFTUP(1)
 950 #define BEZIERSHIFTDOWN(x)  (((x)+(1<<(BEZIERSHIFTBITS-1)))>>BEZIERSHIFTBITS)
 951 /* maximum depth of recursion */
 952 #define BEZIERMAXDEPTH  8
 953
 954 /* size of array to store points on */
 955 /* enough for one curve */
 956 #define BEZIER_INITBUFSIZE    (150)
 957
 958 /* calculate Bezier average, in this case the middle
 959  * correctly rounded...
 960  * */
 961
 962 #define BEZIERMIDDLE(Mid, P1, P2) \
 963     (Mid).x=((P1).x+(P2).x + 1)/2;\
 964     (Mid).y=((P1).y+(P2).y + 1)/2;
 965
 966 /**********************************************************
 967 * BezierCheck helper function to check
 968 * that recursion can be terminated
 969 *       Points[0] and Points[3] are begin and endpoint
 970 *       Points[1] and Points[2] are control points
 971 *       level is the recursion depth
 972 *       returns true if the recursion can be terminated
 973 */
 974 static BOOL BezierCheck( int level, POINT *Points)
 975 {
 976     INT dx, dy;
 977     dx=Points[3].x-Points[0].x;
 978     dy=Points[3].y-Points[0].y;
 979     if(abs(dy)<=abs(dx)){/* shallow line */
 980         /* check that control points are between begin and end */
 981         if(Points[1].x < Points[0].x){
 982             if(Points[1].x < Points[3].x)
 983                 return FALSE;
 984         }else
 985             if(Points[1].x > Points[3].x)
 986                 return FALSE;
 987         if(Points[2].x < Points[0].x){
 988             if(Points[2].x < Points[3].x)
 989                 return FALSE;
 990         }else
 991             if(Points[2].x > Points[3].x)
 992                 return FALSE;
 993         dx=BEZIERSHIFTDOWN(dx);
 994         if(!dx) return TRUE;
 995         if(abs(Points[1].y-Points[0].y-(dy/dx)*
 996                 BEZIERSHIFTDOWN(Points[1].x-Points[0].x)) > BEZIERPIXEL ||
 997            abs(Points[2].y-Points[0].y-(dy/dx)*
 998                    BEZIERSHIFTDOWN(Points[2].x-Points[0].x)) > BEZIERPIXEL )
 999             return FALSE;
1000         else
1001             return TRUE;
1002     }else{ /* steep line */
1003         /* check that control points are between begin and end */
1004         if(Points[1].y < Points[0].y){
1005             if(Points[1].y < Points[3].y)
1006                 return FALSE;
1007         }else
1008             if(Points[1].y > Points[3].y)
1009                 return FALSE;
1010         if(Points[2].y < Points[0].y){
1011             if(Points[2].y < Points[3].y)
1012                 return FALSE;
1013         }else
1014             if(Points[2].y > Points[3].y)
1015                 return FALSE;
1016         dy=BEZIERSHIFTDOWN(dy);
1017         if(!dy) return TRUE;
1018         if(abs(Points[1].x-Points[0].x-(dx/dy)*
1019                 BEZIERSHIFTDOWN(Points[1].y-Points[0].y)) > BEZIERPIXEL ||
1020            abs(Points[2].x-Points[0].x-(dx/dy)*
1021                    BEZIERSHIFTDOWN(Points[2].y-Points[0].y)) > BEZIERPIXEL )
1022             return FALSE;
1023         else
1024             return TRUE;
1025     }
1026 }
1027
1028 /* Helper for GDI_Bezier.
1029  * Just handles one Bezier, so Points should point to four POINTs
1030  */
1031 static void GDI_InternalBezier( POINT *Points, POINT **PtsOut, INT *dwOut,
1032                                 INT *nPtsOut, INT level )
1033 {
1034     if(*nPtsOut == *dwOut) {
1035         *dwOut *= 2;
1036         *PtsOut = HeapReAlloc( GetProcessHeap(), 0, *PtsOut,
1037                                *dwOut * sizeof(POINT) );
1038     }
1039
1040     if(!level || BezierCheck(level, Points)) {
1041         if(*nPtsOut == 0) {
1042             (*PtsOut)[0].x = BEZIERSHIFTDOWN(Points[0].x);
1043             (*PtsOut)[0].y = BEZIERSHIFTDOWN(Points[0].y);
1044             *nPtsOut = 1;
1045         }
1046         (*PtsOut)[*nPtsOut].x = BEZIERSHIFTDOWN(Points[3].x);
1047         (*PtsOut)[*nPtsOut].y = BEZIERSHIFTDOWN(Points[3].y);
1048         (*nPtsOut) ++;
1049     } else {
1050         POINT Points2[4]; /* for the second recursive call */
1051         Points2[3]=Points[3];
1052         BEZIERMIDDLE(Points2[2], Points[2], Points[3]);
1053         BEZIERMIDDLE(Points2[0], Points[1], Points[2]);
1054         BEZIERMIDDLE(Points2[1],Points2[0],Points2[2]);
1055
1056         BEZIERMIDDLE(Points[1], Points[0],  Points[1]);
1057         BEZIERMIDDLE(Points[2], Points[1], Points2[0]);
1058         BEZIERMIDDLE(Points[3], Points[2], Points2[1]);
1059
1060         Points2[0]=Points[3];
1061
1062         /* do the two halves */
1063         GDI_InternalBezier(Points, PtsOut, dwOut, nPtsOut, level-1);
1064         GDI_InternalBezier(Points2, PtsOut, dwOut, nPtsOut, level-1);
1065     }
1066 }
1067
1068
1069
1070 /***********************************************************************
1071  *           GDI_Bezier   [INTERNAL]
1072  *   Calculate line segments that approximate -what microsoft calls- a bezier
1073  *   curve.
1074  *   The routine recursively divides the curve in two parts until a straight
1075  *   line can be drawn
1076  *
1077  *  PARAMS
1078  *
1079  *  Points  [I] Ptr to count POINTs which are the end and control points
1080  *              of the set of Bezier curves to flatten.
1081  *  count   [I] Number of Points.  Must be 3n+1.
1082  *  nPtsOut [O] Will contain no of points that have been produced (i.e. no. of
1083  *              lines+1).
1084  *
1085  *  RETURNS
1086  *
1087  *  Ptr to an array of POINTs that contain the lines that approximate the
1088  *  Beziers.  The array is allocated on the process heap and it is the caller's
1089  *  responsibility to HeapFree it. [this is not a particularly nice interface
1090  *  but since we can't know in advance how many points we will generate, the
1091  *  alternative would be to call the function twice, once to determine the size
1092  *  and a second time to do the work - I decided this was too much of a pain].
1093  */
1094 POINT *GDI_Bezier( const POINT *Points, INT count, INT *nPtsOut )
1095 {
1096     POINT *out;
1097     INT Bezier, dwOut = BEZIER_INITBUFSIZE, i;
1098
1099     if (count == 1 || (count - 1) % 3 != 0) {
1100         ERR("Invalid no. of points %d\n", count);
1101         return NULL;
1102     }
1103     *nPtsOut = 0;
1104     out = HeapAlloc( GetProcessHeap(), 0, dwOut * sizeof(POINT));
1105     for(Bezier = 0; Bezier < (count-1)/3; Bezier++) {
1106         POINT ptBuf[4];
1107         memcpy(ptBuf, Points + Bezier * 3, sizeof(POINT) * 4);
1108         for(i = 0; i < 4; i++) {
1109             ptBuf[i].x = BEZIERSHIFTUP(ptBuf[i].x);
1110             ptBuf[i].y = BEZIERSHIFTUP(ptBuf[i].y);
1111         }
1112         GDI_InternalBezier( ptBuf, &out, &dwOut, nPtsOut, BEZIERMAXDEPTH );
1113     }
1114     TRACE("Produced %d points\n", *nPtsOut);
1115     return out;
1116 }
1117
1118 /******************************************************************************
1119  *           GdiGradientFill   (GDI32.@)
1120  */
1121 BOOL WINAPI GdiGradientFill( HDC hdc, TRIVERTEX *vert_array, ULONG nvert,
1122                              void *grad_array, ULONG ngrad, ULONG mode )
1123 {
1124     DC *dc;
1125     PHYSDEV physdev;
1126     BOOL ret;
1127     ULONG i;
1128
1129     TRACE("%p vert_array:%p nvert:%d grad_array:%p ngrad:%d\n", hdc, vert_array, nvert, grad_array, ngrad);
1130
1131     if (!vert_array || !nvert || !grad_array || !ngrad || mode > GRADIENT_FILL_TRIANGLE)
1132     {
1133         SetLastError( ERROR_INVALID_PARAMETER );
1134         return FALSE;
1135     }
1136     for (i = 0; i < ngrad * (mode == GRADIENT_FILL_TRIANGLE ? 3 : 2); i++)
1137         if (((ULONG *)grad_array)[i] >= nvert) return FALSE;
1138
1139     if (!(dc = get_dc_ptr( hdc )))
1140     {
1141         SetLastError( ERROR_INVALID_PARAMETER );
1142         return FALSE;
1143     }
1144     update_dc( dc );
1145     physdev = GET_DC_PHYSDEV( dc, pGradientFill );
1146     ret = physdev->funcs->pGradientFill( physdev, vert_array, nvert, grad_array, ngrad, mode );
1147     release_dc_ptr( dc );
1148     return ret;
1149 }
1150
1151 /******************************************************************************
1152  *           GdiDrawStream   (GDI32.@)
1153  *
1154  */
1155 BOOL WINAPI GdiDrawStream( HDC hdc, ULONG in, void * pvin )
1156 {
1157     FIXME("stub: %p, %d, %p\n", hdc, in, pvin);
1158     return FALSE;
1159 }