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
);