2 * GDI drawing functions.
4 * Copyright 1993, 1994 Alexandre Julliard
5 * Copyright 1997 Bertho A. Stultiens
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.
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.
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
24 #include "wine/port.h"
34 #include "gdi_private.h"
35 #include "wine/debug.h"
37 WINE_DEFAULT_DEBUG_CHANNEL(gdi);
40 /***********************************************************************
41 * null driver fallback implementations
44 BOOL nulldrv_AngleArc( PHYSDEV dev, INT x, INT y, DWORD radius, FLOAT start, FLOAT sweep )
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 );
56 BOOL nulldrv_ArcTo( PHYSDEV dev, INT left, INT top, INT right, INT bottom,
57 INT xstart, INT ystart, INT xend, INT yend )
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;
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 );
75 BOOL nulldrv_FillRgn( PHYSDEV dev, HRGN rgn, HBRUSH brush )
80 if ((prev = SelectObject( dev->hdc, brush )))
82 ret = PaintRgn( dev->hdc, rgn );
83 SelectObject( dev->hdc, prev );
88 BOOL nulldrv_FrameRgn( PHYSDEV dev, HRGN rgn, HBRUSH brush, INT width, INT height )
91 HRGN tmp = CreateRectRgn( 0, 0, 0, 0 );
95 if (REGION_FrameRgn( tmp, rgn, width, height )) ret = FillRgn( dev->hdc, tmp, brush );
101 BOOL nulldrv_InvertRgn( PHYSDEV dev, HRGN rgn )
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 );
111 BOOL nulldrv_PolyBezier( PHYSDEV dev, const POINT *points, DWORD count )
117 if ((pts = GDI_Bezier( points, count, &n )))
119 ret = Polyline( dev->hdc, pts, n );
120 HeapFree( GetProcessHeap(), 0, pts );
125 BOOL nulldrv_PolyBezierTo( PHYSDEV dev, const POINT *points, DWORD count )
128 POINT *pts = HeapAlloc( GetProcessHeap(), 0, sizeof(POINT) * (count + 1) );
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 );
140 BOOL nulldrv_PolyDraw( PHYSDEV dev, const POINT *points, const BYTE *types, DWORD count )
142 POINT *line_pts = NULL, *bzr_pts = NULL, bzr[4];
143 INT i, num_pts, num_bzr_pts, space, size;
145 /* check for valid point types */
146 for (i = 0; i < count; i++)
151 case PT_LINETO | PT_CLOSEFIGURE:
155 if((i + 2 < count) && (types[i + 1] == PT_BEZIERTO) &&
156 ((types[i + 2] & ~PT_CLOSEFIGURE) == PT_BEZIERTO))
167 line_pts = HeapAlloc( GetProcessHeap(), 0, space * sizeof(POINT) );
170 GetCurrentPositionEx( dev->hdc, &line_pts[0] );
171 for (i = 0; i < count; i++)
176 if (num_pts >= 2) Polyline( dev->hdc, line_pts, num_pts );
178 line_pts[num_pts++] = points[i];
181 case (PT_LINETO | PT_CLOSEFIGURE):
182 line_pts[num_pts++] = points[i];
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) );
189 if ((bzr_pts = GDI_Bezier( bzr, 4, &num_bzr_pts )))
191 size = num_pts + (count - i) + num_bzr_pts;
195 line_pts = HeapReAlloc( GetProcessHeap(), 0, line_pts, space * sizeof(POINT) );
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 );
204 if (types[i] & PT_CLOSEFIGURE) line_pts[num_pts++] = line_pts[0];
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 );
213 BOOL nulldrv_PolylineTo( PHYSDEV dev, const POINT *points, INT count )
218 if (!count) return FALSE;
219 if ((pts = HeapAlloc( GetProcessHeap(), 0, sizeof(POINT) * (count + 1) )))
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 );
229 /***********************************************************************
232 BOOL WINAPI LineTo( HDC hdc, INT x, INT y )
234 DC * dc = get_dc_ptr( hdc );
238 if(!dc) return FALSE;
241 physdev = GET_DC_PHYSDEV( dc, pLineTo );
242 ret = physdev->funcs->pLineTo( physdev, x, y );
248 release_dc_ptr( dc );
253 /***********************************************************************
256 BOOL WINAPI MoveToEx( HDC hdc, INT x, INT y, LPPOINT pt )
260 DC * dc = get_dc_ptr( hdc );
262 if(!dc) return FALSE;
265 pt->x = dc->CursPosX;
266 pt->y = dc->CursPosY;
271 physdev = GET_DC_PHYSDEV( dc, pMoveTo );
272 ret = physdev->funcs->pMoveTo( physdev, x, y );
273 release_dc_ptr( dc );
278 /***********************************************************************
281 BOOL WINAPI Arc( HDC hdc, INT left, INT top, INT right,
282 INT bottom, INT xstart, INT ystart,
287 DC * dc = get_dc_ptr( hdc );
289 if (!dc) return FALSE;
291 physdev = GET_DC_PHYSDEV( dc, pArc );
292 ret = physdev->funcs->pArc( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
293 release_dc_ptr( dc );
297 /***********************************************************************
300 BOOL WINAPI ArcTo( HDC hdc,
302 INT right, INT bottom,
303 INT xstart, INT ystart,
306 double width = fabs(right-left),
307 height = fabs(bottom-top),
310 xcenter = right > left ? left+xradius : right+xradius,
311 ycenter = bottom > top ? top+yradius : bottom+yradius,
315 DC * dc = get_dc_ptr( hdc );
316 if(!dc) return FALSE;
319 physdev = GET_DC_PHYSDEV( dc, pArcTo );
320 result = physdev->funcs->pArcTo( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
323 angle = atan2(((yend-ycenter)/height),
324 ((xend-xcenter)/width));
325 dc->CursPosX = GDI_ROUND(xcenter+(cos(angle)*xradius));
326 dc->CursPosY = GDI_ROUND(ycenter+(sin(angle)*yradius));
328 release_dc_ptr( dc );
333 /***********************************************************************
336 BOOL WINAPI Pie( HDC hdc, INT left, INT top,
337 INT right, INT bottom, INT xstart, INT ystart,
342 DC * dc = get_dc_ptr( hdc );
343 if (!dc) return FALSE;
346 physdev = GET_DC_PHYSDEV( dc, pPie );
347 ret = physdev->funcs->pPie( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
348 release_dc_ptr( dc );
353 /***********************************************************************
356 BOOL WINAPI Chord( HDC hdc, INT left, INT top,
357 INT right, INT bottom, INT xstart, INT ystart,
362 DC * dc = get_dc_ptr( hdc );
363 if (!dc) return FALSE;
366 physdev = GET_DC_PHYSDEV( dc, pChord );
367 ret = physdev->funcs->pChord( physdev, left, top, right, bottom, xstart, ystart, xend, yend );
368 release_dc_ptr( dc );
373 /***********************************************************************
376 BOOL WINAPI Ellipse( HDC hdc, INT left, INT top,
377 INT right, INT bottom )
381 DC * dc = get_dc_ptr( hdc );
382 if (!dc) return FALSE;
385 physdev = GET_DC_PHYSDEV( dc, pEllipse );
386 ret = physdev->funcs->pEllipse( physdev, left, top, right, bottom );
387 release_dc_ptr( dc );
392 /***********************************************************************
393 * Rectangle (GDI32.@)
395 BOOL WINAPI Rectangle( HDC hdc, INT left, INT top,
396 INT right, INT bottom )
400 DC * dc = get_dc_ptr( hdc );
402 if (!dc) return FALSE;
404 physdev = GET_DC_PHYSDEV( dc, pRectangle );
405 ret = physdev->funcs->pRectangle( physdev, left, top, right, bottom );
406 release_dc_ptr( dc );
411 /***********************************************************************
412 * RoundRect (GDI32.@)
414 BOOL WINAPI RoundRect( HDC hdc, INT left, INT top, INT right,
415 INT bottom, INT ell_width, INT ell_height )
419 DC *dc = get_dc_ptr( hdc );
421 if (!dc) return FALSE;
423 physdev = GET_DC_PHYSDEV( dc, pRoundRect );
424 ret = physdev->funcs->pRoundRect( physdev, left, top, right, bottom, ell_width, ell_height );
425 release_dc_ptr( dc );
429 /***********************************************************************
432 COLORREF WINAPI SetPixel( HDC hdc, INT x, INT y, COLORREF color )
436 DC * dc = get_dc_ptr( hdc );
440 physdev = GET_DC_PHYSDEV( dc, pSetPixel );
441 ret = physdev->funcs->pSetPixel( physdev, x, y, color );
442 release_dc_ptr( dc );
446 /***********************************************************************
447 * SetPixelV (GDI32.@)
449 BOOL WINAPI SetPixelV( HDC hdc, INT x, INT y, COLORREF color )
452 DC * dc = get_dc_ptr( hdc );
454 if (!dc) return FALSE;
456 physdev = GET_DC_PHYSDEV( dc, pSetPixel );
457 physdev->funcs->pSetPixel( physdev, x, y, color );
458 release_dc_ptr( dc );
462 /***********************************************************************
465 COLORREF WINAPI GetPixel( HDC hdc, INT x, INT y )
469 DC * dc = get_dc_ptr( hdc );
471 if (!dc) return CLR_INVALID;
473 physdev = GET_DC_PHYSDEV( dc, pGetPixel );
474 ret = physdev->funcs->pGetPixel( physdev, x, y );
475 release_dc_ptr( dc );
480 /******************************************************************************
481 * GdiSetPixelFormat [GDI32.@]
483 * Probably not the correct semantics, it's supposed to be an internal backend for SetPixelFormat.
485 BOOL WINAPI GdiSetPixelFormat( HDC hdc, INT format, const PIXELFORMATDESCRIPTOR *descr )
490 TRACE("(%p,%d,%p)\n", hdc, format, descr);
492 if (!(dc = get_dc_ptr( hdc ))) return FALSE;
494 if (!dc->pixel_format) dc->pixel_format = format;
495 else ret = (dc->pixel_format == format);
496 release_dc_ptr( dc );
501 /******************************************************************************
502 * GdiDescribePixelFormat [GDI32.@]
504 * Probably not the correct semantics, it's supposed to be an internal backend for DescribePixelFormat.
506 INT WINAPI GdiDescribePixelFormat( HDC hdc, INT format, UINT size, PIXELFORMATDESCRIPTOR *descr )
508 FIXME( "(%p,%d,%d,%p): stub\n", hdc, format, size, descr );
513 /******************************************************************************
514 * GdiSwapBuffers [GDI32.@]
516 * Probably not the correct semantics, it's supposed to be an internal backend for SwapBuffers.
518 BOOL WINAPI GdiSwapBuffers( HDC hdc )
520 FIXME( "(%p): stub\n", hdc );
525 /***********************************************************************
528 BOOL WINAPI PaintRgn( HDC hdc, HRGN hrgn )
532 DC * dc = get_dc_ptr( hdc );
534 if (!dc) return FALSE;
536 physdev = GET_DC_PHYSDEV( dc, pPaintRgn );
537 ret = physdev->funcs->pPaintRgn( physdev, hrgn );
538 release_dc_ptr( dc );
543 /***********************************************************************
546 BOOL WINAPI FillRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush )
550 DC * dc = get_dc_ptr( hdc );
552 if (!dc) return FALSE;
554 physdev = GET_DC_PHYSDEV( dc, pFillRgn );
555 retval = physdev->funcs->pFillRgn( physdev, hrgn, hbrush );
556 release_dc_ptr( dc );
561 /***********************************************************************
564 BOOL WINAPI FrameRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush,
565 INT nWidth, INT nHeight )
569 DC *dc = get_dc_ptr( hdc );
571 if (!dc) return FALSE;
573 physdev = GET_DC_PHYSDEV( dc, pFrameRgn );
574 ret = physdev->funcs->pFrameRgn( physdev, hrgn, hbrush, nWidth, nHeight );
575 release_dc_ptr( dc );
580 /***********************************************************************
581 * InvertRgn (GDI32.@)
583 BOOL WINAPI InvertRgn( HDC hdc, HRGN hrgn )
587 DC *dc = get_dc_ptr( hdc );
589 if (!dc) return FALSE;
591 physdev = GET_DC_PHYSDEV( dc, pInvertRgn );
592 ret = physdev->funcs->pInvertRgn( physdev, hrgn );
593 release_dc_ptr( dc );
598 /**********************************************************************
601 BOOL WINAPI Polyline( HDC hdc, const POINT* pt, INT count )
605 DC * dc = get_dc_ptr( hdc );
607 if (!dc) return FALSE;
609 physdev = GET_DC_PHYSDEV( dc, pPolyline );
610 ret = physdev->funcs->pPolyline( physdev, pt, count );
611 release_dc_ptr( dc );
615 /**********************************************************************
616 * PolylineTo (GDI32.@)
618 BOOL WINAPI PolylineTo( HDC hdc, const POINT* pt, DWORD cCount )
620 DC * dc = get_dc_ptr( hdc );
624 if(!dc) return FALSE;
627 physdev = GET_DC_PHYSDEV( dc, pPolylineTo );
628 ret = physdev->funcs->pPolylineTo( physdev, pt, cCount );
632 dc->CursPosX = pt[cCount-1].x;
633 dc->CursPosY = pt[cCount-1].y;
635 release_dc_ptr( dc );
640 /**********************************************************************
643 BOOL WINAPI Polygon( HDC hdc, const POINT* pt, INT count )
647 DC * dc = get_dc_ptr( hdc );
649 if (!dc) return FALSE;
651 physdev = GET_DC_PHYSDEV( dc, pPolygon );
652 ret = physdev->funcs->pPolygon( physdev, pt, count );
653 release_dc_ptr( dc );
658 /**********************************************************************
659 * PolyPolygon (GDI32.@)
661 BOOL WINAPI PolyPolygon( HDC hdc, const POINT* pt, const INT* counts,
666 DC * dc = get_dc_ptr( hdc );
668 if (!dc) return FALSE;
670 physdev = GET_DC_PHYSDEV( dc, pPolyPolygon );
671 ret = physdev->funcs->pPolyPolygon( physdev, pt, counts, polygons );
672 release_dc_ptr( dc );
676 /**********************************************************************
677 * PolyPolyline (GDI32.@)
679 BOOL WINAPI PolyPolyline( HDC hdc, const POINT* pt, const DWORD* counts,
684 DC * dc = get_dc_ptr( hdc );
686 if (!dc) return FALSE;
688 physdev = GET_DC_PHYSDEV( dc, pPolyPolyline );
689 ret = physdev->funcs->pPolyPolyline( physdev, pt, counts, polylines );
690 release_dc_ptr( dc );
694 /**********************************************************************
695 * ExtFloodFill (GDI32.@)
697 BOOL WINAPI ExtFloodFill( HDC hdc, INT x, INT y, COLORREF color,
702 DC * dc = get_dc_ptr( hdc );
704 if (!dc) return FALSE;
706 physdev = GET_DC_PHYSDEV( dc, pExtFloodFill );
707 ret = physdev->funcs->pExtFloodFill( physdev, x, y, color, fillType );
708 release_dc_ptr( dc );
713 /**********************************************************************
714 * FloodFill (GDI32.@)
716 BOOL WINAPI FloodFill( HDC hdc, INT x, INT y, COLORREF color )
718 return ExtFloodFill( hdc, x, y, color, FLOODFILLBORDER );
722 /******************************************************************************
723 * PolyBezier [GDI32.@]
724 * Draws one or more Bezier curves
727 * hDc [I] Handle to device context
728 * lppt [I] Pointer to endpoints and control points
729 * cPoints [I] Count of endpoints and control points
735 BOOL WINAPI PolyBezier( HDC hdc, const POINT* lppt, DWORD cPoints )
741 /* cPoints must be 3 * n + 1 (where n>=1) */
742 if (cPoints == 1 || (cPoints % 3) != 1) return FALSE;
744 dc = get_dc_ptr( hdc );
745 if(!dc) return FALSE;
748 physdev = GET_DC_PHYSDEV( dc, pPolyBezier );
749 ret = physdev->funcs->pPolyBezier( physdev, lppt, cPoints );
750 release_dc_ptr( dc );
754 /******************************************************************************
755 * PolyBezierTo [GDI32.@]
756 * Draws one or more Bezier curves
759 * hDc [I] Handle to device context
760 * lppt [I] Pointer to endpoints and control points
761 * cPoints [I] Count of endpoints and control points
767 BOOL WINAPI PolyBezierTo( HDC hdc, const POINT* lppt, DWORD cPoints )
773 /* cbPoints must be 3 * n (where n>=1) */
774 if (!cPoints || (cPoints % 3) != 0) return FALSE;
776 dc = get_dc_ptr( hdc );
777 if(!dc) return FALSE;
780 physdev = GET_DC_PHYSDEV( dc, pPolyBezierTo );
781 ret = physdev->funcs->pPolyBezierTo( physdev, lppt, cPoints );
784 dc->CursPosX = lppt[cPoints-1].x;
785 dc->CursPosY = lppt[cPoints-1].y;
787 release_dc_ptr( dc );
791 /***********************************************************************
794 BOOL WINAPI AngleArc(HDC hdc, INT x, INT y, DWORD dwRadius, FLOAT eStartAngle, FLOAT eSweepAngle)
800 if( (signed int)dwRadius < 0 )
803 dc = get_dc_ptr( hdc );
804 if(!dc) return FALSE;
807 physdev = GET_DC_PHYSDEV( dc, pAngleArc );
808 result = physdev->funcs->pAngleArc( physdev, x, y, dwRadius, eStartAngle, eSweepAngle );
811 dc->CursPosX = GDI_ROUND( x + cos((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius );
812 dc->CursPosY = GDI_ROUND( y - sin((eStartAngle+eSweepAngle)*M_PI/180) * dwRadius );
814 release_dc_ptr( dc );
818 /***********************************************************************
821 BOOL WINAPI PolyDraw(HDC hdc, const POINT *lppt, const BYTE *lpbTypes,
824 DC *dc = get_dc_ptr( hdc );
828 if(!dc) return FALSE;
831 physdev = GET_DC_PHYSDEV( dc, pPolyDraw );
832 result = physdev->funcs->pPolyDraw( physdev, lppt, lpbTypes, cCount );
833 release_dc_ptr( dc );
838 /**********************************************************************
841 BOOL WINAPI LineDDA(INT nXStart, INT nYStart, INT nXEnd, INT nYEnd,
842 LINEDDAPROC callback, LPARAM lParam )
844 INT xadd = 1, yadd = 1;
847 INT dx = nXEnd - nXStart;
848 INT dy = nYEnd - nYStart;
860 if (dx > dy) /* line is "more horizontal" */
862 err = 2*dy - dx; erradd = 2*dy - 2*dx;
863 for(cnt = 0;cnt < dx; cnt++)
865 callback(nXStart,nYStart,lParam);
875 else /* line is "more vertical" */
877 err = 2*dx - dy; erradd = 2*dx - 2*dy;
878 for(cnt = 0;cnt < dy; cnt++)
880 callback(nXStart,nYStart,lParam);
894 /******************************************************************
896 * *Very* simple bezier drawing code,
898 * It uses a recursive algorithm to divide the curve in a series
899 * of straight line segments. Not ideal but sufficient for me.
900 * If you are in need for something better look for some incremental
903 * 7 July 1998 Rein Klazes
907 * some macro definitions for bezier drawing
909 * to avoid truncation errors the coordinates are
910 * shifted upwards. When used in drawing they are
911 * shifted down again, including correct rounding
912 * and avoiding floating point arithmetic
913 * 4 bits should allow 27 bits coordinates which I saw
914 * somewhere in the win32 doc's
918 #define BEZIERSHIFTBITS 4
919 #define BEZIERSHIFTUP(x) ((x)<<BEZIERSHIFTBITS)
920 #define BEZIERPIXEL BEZIERSHIFTUP(1)
921 #define BEZIERSHIFTDOWN(x) (((x)+(1<<(BEZIERSHIFTBITS-1)))>>BEZIERSHIFTBITS)
922 /* maximum depth of recursion */
923 #define BEZIERMAXDEPTH 8
925 /* size of array to store points on */
926 /* enough for one curve */
927 #define BEZIER_INITBUFSIZE (150)
929 /* calculate Bezier average, in this case the middle
930 * correctly rounded...
933 #define BEZIERMIDDLE(Mid, P1, P2) \
934 (Mid).x=((P1).x+(P2).x + 1)/2;\
935 (Mid).y=((P1).y+(P2).y + 1)/2;
937 /**********************************************************
938 * BezierCheck helper function to check
939 * that recursion can be terminated
940 * Points[0] and Points[3] are begin and endpoint
941 * Points[1] and Points[2] are control points
942 * level is the recursion depth
943 * returns true if the recursion can be terminated
945 static BOOL BezierCheck( int level, POINT *Points)
948 dx=Points[3].x-Points[0].x;
949 dy=Points[3].y-Points[0].y;
950 if(abs(dy)<=abs(dx)){/* shallow line */
951 /* check that control points are between begin and end */
952 if(Points[1].x < Points[0].x){
953 if(Points[1].x < Points[3].x)
956 if(Points[1].x > Points[3].x)
958 if(Points[2].x < Points[0].x){
959 if(Points[2].x < Points[3].x)
962 if(Points[2].x > Points[3].x)
964 dx=BEZIERSHIFTDOWN(dx);
966 if(abs(Points[1].y-Points[0].y-(dy/dx)*
967 BEZIERSHIFTDOWN(Points[1].x-Points[0].x)) > BEZIERPIXEL ||
968 abs(Points[2].y-Points[0].y-(dy/dx)*
969 BEZIERSHIFTDOWN(Points[2].x-Points[0].x)) > BEZIERPIXEL )
973 }else{ /* steep line */
974 /* check that control points are between begin and end */
975 if(Points[1].y < Points[0].y){
976 if(Points[1].y < Points[3].y)
979 if(Points[1].y > Points[3].y)
981 if(Points[2].y < Points[0].y){
982 if(Points[2].y < Points[3].y)
985 if(Points[2].y > Points[3].y)
987 dy=BEZIERSHIFTDOWN(dy);
989 if(abs(Points[1].x-Points[0].x-(dx/dy)*
990 BEZIERSHIFTDOWN(Points[1].y-Points[0].y)) > BEZIERPIXEL ||
991 abs(Points[2].x-Points[0].x-(dx/dy)*
992 BEZIERSHIFTDOWN(Points[2].y-Points[0].y)) > BEZIERPIXEL )
999 /* Helper for GDI_Bezier.
1000 * Just handles one Bezier, so Points should point to four POINTs
1002 static void GDI_InternalBezier( POINT *Points, POINT **PtsOut, INT *dwOut,
1003 INT *nPtsOut, INT level )
1005 if(*nPtsOut == *dwOut) {
1007 *PtsOut = HeapReAlloc( GetProcessHeap(), 0, *PtsOut,
1008 *dwOut * sizeof(POINT) );
1011 if(!level || BezierCheck(level, Points)) {
1013 (*PtsOut)[0].x = BEZIERSHIFTDOWN(Points[0].x);
1014 (*PtsOut)[0].y = BEZIERSHIFTDOWN(Points[0].y);
1017 (*PtsOut)[*nPtsOut].x = BEZIERSHIFTDOWN(Points[3].x);
1018 (*PtsOut)[*nPtsOut].y = BEZIERSHIFTDOWN(Points[3].y);
1021 POINT Points2[4]; /* for the second recursive call */
1022 Points2[3]=Points[3];
1023 BEZIERMIDDLE(Points2[2], Points[2], Points[3]);
1024 BEZIERMIDDLE(Points2[0], Points[1], Points[2]);
1025 BEZIERMIDDLE(Points2[1],Points2[0],Points2[2]);
1027 BEZIERMIDDLE(Points[1], Points[0], Points[1]);
1028 BEZIERMIDDLE(Points[2], Points[1], Points2[0]);
1029 BEZIERMIDDLE(Points[3], Points[2], Points2[1]);
1031 Points2[0]=Points[3];
1033 /* do the two halves */
1034 GDI_InternalBezier(Points, PtsOut, dwOut, nPtsOut, level-1);
1035 GDI_InternalBezier(Points2, PtsOut, dwOut, nPtsOut, level-1);
1041 /***********************************************************************
1042 * GDI_Bezier [INTERNAL]
1043 * Calculate line segments that approximate -what microsoft calls- a bezier
1045 * The routine recursively divides the curve in two parts until a straight
1050 * Points [I] Ptr to count POINTs which are the end and control points
1051 * of the set of Bezier curves to flatten.
1052 * count [I] Number of Points. Must be 3n+1.
1053 * nPtsOut [O] Will contain no of points that have been produced (i.e. no. of
1058 * Ptr to an array of POINTs that contain the lines that approximate the
1059 * Beziers. The array is allocated on the process heap and it is the caller's
1060 * responsibility to HeapFree it. [this is not a particularly nice interface
1061 * but since we can't know in advance how many points we will generate, the
1062 * alternative would be to call the function twice, once to determine the size
1063 * and a second time to do the work - I decided this was too much of a pain].
1065 POINT *GDI_Bezier( const POINT *Points, INT count, INT *nPtsOut )
1068 INT Bezier, dwOut = BEZIER_INITBUFSIZE, i;
1070 if (count == 1 || (count - 1) % 3 != 0) {
1071 ERR("Invalid no. of points %d\n", count);
1075 out = HeapAlloc( GetProcessHeap(), 0, dwOut * sizeof(POINT));
1076 for(Bezier = 0; Bezier < (count-1)/3; Bezier++) {
1078 memcpy(ptBuf, Points + Bezier * 3, sizeof(POINT) * 4);
1079 for(i = 0; i < 4; i++) {
1080 ptBuf[i].x = BEZIERSHIFTUP(ptBuf[i].x);
1081 ptBuf[i].y = BEZIERSHIFTUP(ptBuf[i].y);
1083 GDI_InternalBezier( ptBuf, &out, &dwOut, nPtsOut, BEZIERMAXDEPTH );
1085 TRACE("Produced %d points\n", *nPtsOut);
1089 /******************************************************************************
1090 * GdiGradientFill (GDI32.@)
1092 BOOL WINAPI GdiGradientFill( HDC hdc, TRIVERTEX *vert_array, ULONG nvert,
1093 void *grad_array, ULONG ngrad, ULONG mode )
1100 TRACE("%p vert_array:%p nvert:%d grad_array:%p ngrad:%d\n", hdc, vert_array, nvert, grad_array, ngrad);
1102 if (!vert_array || !nvert || !grad_array || !ngrad || mode > GRADIENT_FILL_TRIANGLE)
1104 SetLastError( ERROR_INVALID_PARAMETER );
1107 for (i = 0; i < ngrad * (mode == GRADIENT_FILL_TRIANGLE ? 3 : 2); i++)
1108 if (((ULONG *)grad_array)[i] >= nvert) return FALSE;
1110 if (!(dc = get_dc_ptr( hdc )))
1112 SetLastError( ERROR_INVALID_PARAMETER );
1116 physdev = GET_DC_PHYSDEV( dc, pGradientFill );
1117 ret = physdev->funcs->pGradientFill( physdev, vert_array, nvert, grad_array, ngrad, mode );
1118 release_dc_ptr( dc );
1122 /******************************************************************************
1123 * GdiDrawStream (GDI32.@)
1126 BOOL WINAPI GdiDrawStream( HDC hdc, ULONG in, void * pvin )
1128 FIXME("stub: %p, %d, %p\n", hdc, in, pvin);