2 * Graphics paths (BeginPath, EndPath etc.)
4 * Copyright 1997, 1998 Martin Boehme
12 #if defined(HAVE_FLOAT_H)
21 #include "debugtools.h"
24 DEFAULT_DEBUG_CHANNEL(gdi)
26 /* Notes on the implementation
28 * The implementation is based on dynamically resizable arrays of points and
29 * flags. I dithered for a bit before deciding on this implementation, and
30 * I had even done a bit of work on a linked list version before switching
31 * to arrays. It's a bit of a tradeoff. When you use linked lists, the
32 * implementation of FlattenPath is easier, because you can rip the
33 * PT_BEZIERTO entries out of the middle of the list and link the
34 * corresponding PT_LINETO entries in. However, when you use arrays,
35 * PathToRegion becomes easier, since you can essentially just pass your array
36 * of points to CreatePolyPolygonRgn. Also, if I'd used linked lists, I would
37 * have had the extra effort of creating a chunk-based allocation scheme
38 * in order to use memory effectively. That's why I finally decided to use
39 * arrays. Note by the way that the array based implementation has the same
40 * linear time complexity that linked lists would have since the arrays grow
43 * The points are stored in the path in device coordinates. This is
44 * consistent with the way Windows does things (for instance, see the Win32
45 * SDK documentation for GetPath).
47 * The word "stroke" appears in several places (e.g. in the flag
48 * GdiPath.newStroke). A stroke consists of a PT_MOVETO followed by one or
49 * more PT_LINETOs or PT_BEZIERTOs, up to, but not including, the next
50 * PT_MOVETO. Note that this is not the same as the definition of a figure;
51 * a figure can contain several strokes.
53 * I modified the drawing functions (MoveTo, LineTo etc.) to test whether
54 * the path is open and to call the corresponding function in path.c if this
55 * is the case. A more elegant approach would be to modify the function
56 * pointers in the DC_FUNCTIONS structure; however, this would be a lot more
57 * complex. Also, the performance degradation caused by my approach in the
58 * case where no path is open is so small that it cannot be measured.
63 /* FIXME: A lot of stuff isn't implemented yet. There is much more to come. */
65 #define NUM_ENTRIES_INITIAL 16 /* Initial size of points / flags arrays */
66 #define GROW_FACTOR_NUMER 2 /* Numerator of grow factor for the array */
67 #define GROW_FACTOR_DENOM 1 /* Denominator of grow factor */
70 static BOOL PATH_PathToRegion(GdiPath *pPath, INT nPolyFillMode,
72 static void PATH_EmptyPath(GdiPath *pPath);
73 static BOOL PATH_AddEntry(GdiPath *pPath, const POINT *pPoint,
75 static BOOL PATH_ReserveEntries(GdiPath *pPath, INT numEntries);
76 static BOOL PATH_GetPathFromHDC(HDC hdc, GdiPath **ppPath);
77 static BOOL PATH_DoArcPart(GdiPath *pPath, FLOAT_POINT corners[],
78 double angleStart, double angleEnd, BOOL addMoveTo);
79 static void PATH_ScaleNormalizedPoint(FLOAT_POINT corners[], double x,
80 double y, POINT *pPoint);
81 static void PATH_NormalizePoint(FLOAT_POINT corners[], const FLOAT_POINT
82 *pPoint, double *pX, double *pY);
85 /***********************************************************************
86 * BeginPath16 (GDI.512)
88 BOOL16 WINAPI BeginPath16(HDC16 hdc)
90 return (BOOL16)BeginPath((HDC)hdc);
94 /***********************************************************************
97 BOOL WINAPI BeginPath(HDC hdc)
99 DC *dc = DC_GetDCPtr( hdc );
103 SetLastError(ERROR_INVALID_HANDLE);
107 if(dc->funcs->pBeginPath)
108 return dc->funcs->pBeginPath(dc);
112 /* If path is already open, do nothing */
113 if(pPath->state==PATH_Open)
116 /* Make sure that path is empty */
117 PATH_EmptyPath(pPath);
119 /* Initialize variables for new path */
120 pPath->newStroke=TRUE;
121 pPath->state=PATH_Open;
127 /***********************************************************************
128 * EndPath16 (GDI.514)
130 BOOL16 WINAPI EndPath16(HDC16 hdc)
132 return (BOOL16)EndPath((HDC)hdc);
136 /***********************************************************************
139 BOOL WINAPI EndPath(HDC hdc)
141 DC *dc = DC_GetDCPtr( hdc );
145 SetLastError(ERROR_INVALID_HANDLE);
149 if(dc->funcs->pEndPath)
150 return dc->funcs->pEndPath(dc);
154 /* Check that path is currently being constructed */
155 if(pPath->state!=PATH_Open)
157 SetLastError(ERROR_CAN_NOT_COMPLETE);
161 /* Set flag to indicate that path is finished */
162 pPath->state=PATH_Closed;
168 /***********************************************************************
169 * AbortPath16 (GDI.511)
171 BOOL16 WINAPI AbortPath16(HDC16 hdc)
173 return (BOOL16)AbortPath((HDC)hdc);
177 /******************************************************************************
178 * AbortPath [GDI32.1]
179 * Closes and discards paths from device context
182 * Check that SetLastError is being called correctly
185 * hdc [I] Handle to device context
189 BOOL WINAPI AbortPath( HDC hdc )
191 DC *dc = DC_GetDCPtr( hdc );
195 SetLastError(ERROR_INVALID_HANDLE);
199 if(dc->funcs->pAbortPath)
200 return dc->funcs->pAbortPath(dc);
204 /* Remove all entries from the path */
205 PATH_EmptyPath(pPath);
211 /***********************************************************************
212 * CloseFigure16 (GDI.513)
214 BOOL16 WINAPI CloseFigure16(HDC16 hdc)
216 return (BOOL16)CloseFigure((HDC)hdc);
220 /***********************************************************************
221 * CloseFigure (GDI32.16)
223 * FIXME: Check that SetLastError is being called correctly
225 BOOL WINAPI CloseFigure(HDC hdc)
227 DC *dc = DC_GetDCPtr( hdc );
231 SetLastError(ERROR_INVALID_HANDLE);
235 if(dc->funcs->pCloseFigure)
236 return dc->funcs->pCloseFigure(dc);
240 /* Check that path is open */
241 if(pPath->state!=PATH_Open)
243 SetLastError(ERROR_CAN_NOT_COMPLETE);
247 /* Set PT_CLOSEFIGURE on the last entry and start a new stroke */
248 if(pPath->numEntriesUsed)
250 pPath->pFlags[pPath->numEntriesUsed-1]|=PT_CLOSEFIGURE;
251 pPath->newStroke=TRUE;
258 /***********************************************************************
259 * GetPath16 (GDI.517)
261 INT16 WINAPI GetPath16(HDC16 hdc, LPPOINT16 pPoints, LPBYTE pTypes,
264 FIXME("(%d,%p,%p): stub\n",hdc,pPoints,pTypes);
270 /***********************************************************************
271 * GetPath (GDI32.210)
273 INT WINAPI GetPath(HDC hdc, LPPOINT pPoints, LPBYTE pTypes,
278 /* Get pointer to path */
279 if(!PATH_GetPathFromHDC(hdc, &pPath))
281 SetLastError(ERROR_INVALID_PARAMETER);
285 /* Check that path is closed */
286 if(pPath->state!=PATH_Closed)
288 SetLastError(ERROR_CAN_NOT_COMPLETE);
293 return pPath->numEntriesUsed;
294 else if(nSize<pPath->numEntriesUsed)
296 SetLastError(ERROR_INVALID_PARAMETER);
301 memcpy(pPoints, pPath->pPoints, sizeof(POINT)*pPath->numEntriesUsed);
302 memcpy(pTypes, pPath->pFlags, sizeof(BYTE)*pPath->numEntriesUsed);
304 /* Convert the points to logical coordinates */
305 if(!DPtoLP(hdc, pPoints, pPath->numEntriesUsed))
307 /* FIXME: Is this the correct value? */
308 SetLastError(ERROR_CAN_NOT_COMPLETE);
312 return pPath->numEntriesUsed;
316 /***********************************************************************
317 * PathToRegion16 (GDI.518)
319 HRGN16 WINAPI PathToRegion16(HDC16 hdc)
321 return (HRGN16) PathToRegion((HDC) hdc);
324 /***********************************************************************
325 * PathToRegion (GDI32.261)
328 * Check that SetLastError is being called correctly
330 * The documentation does not state this explicitly, but a test under Windows
331 * shows that the region which is returned should be in device coordinates.
333 HRGN WINAPI PathToRegion(HDC hdc)
338 /* Get pointer to path */
339 if(!PATH_GetPathFromHDC(hdc, &pPath))
341 SetLastError(ERROR_INVALID_PARAMETER);
345 /* Check that path is closed */
346 if(pPath->state!=PATH_Closed)
348 SetLastError(ERROR_CAN_NOT_COMPLETE);
352 /* FIXME: Should we empty the path even if conversion failed? */
353 if(PATH_PathToRegion(pPath, GetPolyFillMode(hdc), &hrgnRval))
354 PATH_EmptyPath(pPath);
361 static BOOL PATH_FillPath(HDC hdc, GdiPath *pPath)
363 INT mapMode, graphicsMode;
364 SIZE ptViewportExt, ptWindowExt;
365 POINT ptViewportOrg, ptWindowOrg;
369 /* Check that path is closed */
370 if(pPath->state!=PATH_Closed)
372 SetLastError(ERROR_CAN_NOT_COMPLETE);
376 /* Construct a region from the path and fill it */
377 if(PATH_PathToRegion(pPath, GetPolyFillMode(hdc), &hrgn))
379 /* Since PaintRgn interprets the region as being in logical coordinates
380 * but the points we store for the path are already in device
381 * coordinates, we have to set the mapping mode to MM_TEXT temporarily.
382 * Using SaveDC to save information about the mapping mode / world
383 * transform would be easier but would require more overhead, especially
384 * now that SaveDC saves the current path.
387 /* Save the information about the old mapping mode */
388 mapMode=GetMapMode(hdc);
389 GetViewportExtEx(hdc, &ptViewportExt);
390 GetViewportOrgEx(hdc, &ptViewportOrg);
391 GetWindowExtEx(hdc, &ptWindowExt);
392 GetWindowOrgEx(hdc, &ptWindowOrg);
394 /* Save world transform
395 * NB: The Windows documentation on world transforms would lead one to
396 * believe that this has to be done only in GM_ADVANCED; however, my
397 * tests show that resetting the graphics mode to GM_COMPATIBLE does
398 * not reset the world transform.
400 GetWorldTransform(hdc, &xform);
403 SetMapMode(hdc, MM_TEXT);
404 SetViewportOrgEx(hdc, 0, 0, NULL);
405 SetWindowOrgEx(hdc, 0, 0, NULL);
407 /* Paint the region */
410 /* Restore the old mapping mode */
411 SetMapMode(hdc, mapMode);
412 SetViewportExtEx(hdc, ptViewportExt.cx, ptViewportExt.cy, NULL);
413 SetViewportOrgEx(hdc, ptViewportOrg.x, ptViewportOrg.y, NULL);
414 SetWindowExtEx(hdc, ptWindowExt.cx, ptWindowExt.cy, NULL);
415 SetWindowOrgEx(hdc, ptWindowOrg.x, ptWindowOrg.y, NULL);
417 /* Go to GM_ADVANCED temporarily to restore the world transform */
418 graphicsMode=GetGraphicsMode(hdc);
419 SetGraphicsMode(hdc, GM_ADVANCED);
420 SetWorldTransform(hdc, &xform);
421 SetGraphicsMode(hdc, graphicsMode);
427 /***********************************************************************
428 * FillPath16 (GDI.515)
430 BOOL16 WINAPI FillPath16(HDC16 hdc)
432 return (BOOL16) FillPath((HDC) hdc);
435 /***********************************************************************
436 * FillPath (GDI32.100)
439 * Check that SetLastError is being called correctly
441 BOOL WINAPI FillPath(HDC hdc)
443 DC *dc = DC_GetDCPtr( hdc );
446 SetLastError(ERROR_INVALID_HANDLE);
450 if(dc->funcs->pFillPath)
451 return dc->funcs->pFillPath(dc);
453 if(!PATH_FillPath(hdc, &dc->w.path))
456 /* FIXME: Should the path be emptied even if conversion failed? */
457 PATH_EmptyPath(&dc->w.path);
461 /***********************************************************************
462 * SelectClipPath16 (GDI.519)
464 BOOL16 WINAPI SelectClipPath16(HDC16 hdc, INT16 iMode)
466 return (BOOL16) SelectClipPath((HDC) hdc, iMode);
469 /***********************************************************************
470 * SelectClipPath (GDI32.296)
472 * Check that SetLastError is being called correctly
474 BOOL WINAPI SelectClipPath(HDC hdc, INT iMode)
479 DC *dc = DC_GetDCPtr( hdc );
482 SetLastError(ERROR_INVALID_HANDLE);
486 if(dc->funcs->pSelectClipPath)
487 return dc->funcs->pSelectClipPath(dc, iMode);
491 /* Check that path is closed */
492 if(pPath->state!=PATH_Closed)
494 SetLastError(ERROR_CAN_NOT_COMPLETE);
498 /* Construct a region from the path */
499 if(PATH_PathToRegion(pPath, GetPolyFillMode(hdc), &hrgnPath))
501 success = ExtSelectClipRgn( hdc, hrgnPath, iMode ) != ERROR;
502 DeleteObject(hrgnPath);
506 PATH_EmptyPath(pPath);
507 /* FIXME: Should this function delete the path even if it failed? */
516 /***********************************************************************
522 * Initializes the GdiPath structure.
524 void PATH_InitGdiPath(GdiPath *pPath)
528 pPath->state=PATH_Null;
531 pPath->numEntriesUsed=0;
532 pPath->numEntriesAllocated=0;
535 /* PATH_DestroyGdiPath
537 * Destroys a GdiPath structure (frees the memory in the arrays).
539 void PATH_DestroyGdiPath(GdiPath *pPath)
543 if (pPath->pPoints) HeapFree( GetProcessHeap(), 0, pPath->pPoints );
544 if (pPath->pFlags) HeapFree( GetProcessHeap(), 0, pPath->pFlags );
547 /* PATH_AssignGdiPath
549 * Copies the GdiPath structure "pPathSrc" to "pPathDest". A deep copy is
550 * performed, i.e. the contents of the pPoints and pFlags arrays are copied,
551 * not just the pointers. Since this means that the arrays in pPathDest may
552 * need to be resized, pPathDest should have been initialized using
553 * PATH_InitGdiPath (in C++, this function would be an assignment operator,
554 * not a copy constructor).
555 * Returns TRUE if successful, else FALSE.
557 BOOL PATH_AssignGdiPath(GdiPath *pPathDest, const GdiPath *pPathSrc)
559 assert(pPathDest!=NULL && pPathSrc!=NULL);
561 /* Make sure destination arrays are big enough */
562 if(!PATH_ReserveEntries(pPathDest, pPathSrc->numEntriesUsed))
565 /* Perform the copy operation */
566 memcpy(pPathDest->pPoints, pPathSrc->pPoints,
567 sizeof(POINT)*pPathSrc->numEntriesUsed);
568 memcpy(pPathDest->pFlags, pPathSrc->pFlags,
569 sizeof(BYTE)*pPathSrc->numEntriesUsed);
571 pPathDest->state=pPathSrc->state;
572 pPathDest->numEntriesUsed=pPathSrc->numEntriesUsed;
573 pPathDest->newStroke=pPathSrc->newStroke;
580 * Should be called when a MoveTo is performed on a DC that has an
581 * open path. This starts a new stroke. Returns TRUE if successful, else
584 BOOL PATH_MoveTo(HDC hdc)
588 /* Get pointer to path */
589 if(!PATH_GetPathFromHDC(hdc, &pPath))
592 /* Check that path is open */
593 if(pPath->state!=PATH_Open)
594 /* FIXME: Do we have to call SetLastError? */
597 /* Start a new stroke */
598 pPath->newStroke=TRUE;
605 * Should be called when a LineTo is performed on a DC that has an
606 * open path. This adds a PT_LINETO entry to the path (and possibly
607 * a PT_MOVETO entry, if this is the first LineTo in a stroke).
608 * Returns TRUE if successful, else FALSE.
610 BOOL PATH_LineTo(HDC hdc, INT x, INT y)
613 POINT point, pointCurPos;
615 /* Get pointer to path */
616 if(!PATH_GetPathFromHDC(hdc, &pPath))
619 /* Check that path is open */
620 if(pPath->state!=PATH_Open)
623 /* Convert point to device coordinates */
626 if(!LPtoDP(hdc, &point, 1))
629 /* Add a PT_MOVETO if necessary */
632 pPath->newStroke=FALSE;
633 if(!GetCurrentPositionEx(hdc, &pointCurPos) ||
634 !LPtoDP(hdc, &pointCurPos, 1))
636 if(!PATH_AddEntry(pPath, &pointCurPos, PT_MOVETO))
640 /* Add a PT_LINETO entry */
641 return PATH_AddEntry(pPath, &point, PT_LINETO);
646 * Should be called when a call to Rectangle is performed on a DC that has
647 * an open path. Returns TRUE if successful, else FALSE.
649 BOOL PATH_Rectangle(HDC hdc, INT x1, INT y1, INT x2, INT y2)
652 POINT corners[2], pointTemp;
655 /* Get pointer to path */
656 if(!PATH_GetPathFromHDC(hdc, &pPath))
659 /* Check that path is open */
660 if(pPath->state!=PATH_Open)
663 /* Convert points to device coordinates */
668 if(!LPtoDP(hdc, corners, 2))
671 /* Make sure first corner is top left and second corner is bottom right */
672 if(corners[0].x>corners[1].x)
675 corners[0].x=corners[1].x;
678 if(corners[0].y>corners[1].y)
681 corners[0].y=corners[1].y;
685 /* In GM_COMPATIBLE, don't include bottom and right edges */
686 if(GetGraphicsMode(hdc)==GM_COMPATIBLE)
692 /* Close any previous figure */
693 if(!CloseFigure(hdc))
695 /* The CloseFigure call shouldn't have failed */
700 /* Add four points to the path */
701 pointTemp.x=corners[1].x;
702 pointTemp.y=corners[0].y;
703 if(!PATH_AddEntry(pPath, &pointTemp, PT_MOVETO))
705 if(!PATH_AddEntry(pPath, corners, PT_LINETO))
707 pointTemp.x=corners[0].x;
708 pointTemp.y=corners[1].y;
709 if(!PATH_AddEntry(pPath, &pointTemp, PT_LINETO))
711 if(!PATH_AddEntry(pPath, corners+1, PT_LINETO))
714 /* Close the rectangle figure */
715 if(!CloseFigure(hdc))
717 /* The CloseFigure call shouldn't have failed */
727 * Should be called when a call to Ellipse is performed on a DC that has
728 * an open path. This adds four Bezier splines representing the ellipse
729 * to the path. Returns TRUE if successful, else FALSE.
731 BOOL PATH_Ellipse(HDC hdc, INT x1, INT y1, INT x2, INT y2)
733 /* TODO: This should probably be revised to call PATH_AngleArc */
734 /* (once it exists) */
735 return PATH_Arc(hdc, x1, y1, x2, y2, x1, (y1+y2)/2, x1, (y1+y2)/2);
740 * Should be called when a call to Arc is performed on a DC that has
741 * an open path. This adds up to five Bezier splines representing the arc
742 * to the path. Returns TRUE if successful, else FALSE.
744 BOOL PATH_Arc(HDC hdc, INT x1, INT y1, INT x2, INT y2,
745 INT xStart, INT yStart, INT xEnd, INT yEnd)
749 double angleStart, angleEnd, angleStartQuadrant, angleEndQuadrant=0.0;
750 /* Initialize angleEndQuadrant to silence gcc's warning */
752 FLOAT_POINT corners[2], pointStart, pointEnd;
756 /* FIXME: This function should check for all possible error returns */
757 /* FIXME: Do we have to respect newStroke? */
759 /* Get pointer to DC */
760 pDC=DC_GetDCPtr(hdc);
764 /* Get pointer to path */
765 if(!PATH_GetPathFromHDC(hdc, &pPath))
768 /* Check that path is open */
769 if(pPath->state!=PATH_Open)
772 /* FIXME: Do we have to close the current figure? */
774 /* Check for zero height / width */
775 /* FIXME: Only in GM_COMPATIBLE? */
779 /* Convert points to device coordinates */
780 corners[0].x=(FLOAT)x1;
781 corners[0].y=(FLOAT)y1;
782 corners[1].x=(FLOAT)x2;
783 corners[1].y=(FLOAT)y2;
784 pointStart.x=(FLOAT)xStart;
785 pointStart.y=(FLOAT)yStart;
786 pointEnd.x=(FLOAT)xEnd;
787 pointEnd.y=(FLOAT)yEnd;
788 INTERNAL_LPTODP_FLOAT(pDC, corners);
789 INTERNAL_LPTODP_FLOAT(pDC, corners+1);
790 INTERNAL_LPTODP_FLOAT(pDC, &pointStart);
791 INTERNAL_LPTODP_FLOAT(pDC, &pointEnd);
793 /* Make sure first corner is top left and second corner is bottom right */
794 if(corners[0].x>corners[1].x)
797 corners[0].x=corners[1].x;
800 if(corners[0].y>corners[1].y)
803 corners[0].y=corners[1].y;
807 /* Compute start and end angle */
808 PATH_NormalizePoint(corners, &pointStart, &x, &y);
809 angleStart=atan2(y, x);
810 PATH_NormalizePoint(corners, &pointEnd, &x, &y);
811 angleEnd=atan2(y, x);
813 /* Make sure the end angle is "on the right side" of the start angle */
814 if(GetArcDirection(hdc)==AD_CLOCKWISE)
816 if(angleEnd<=angleStart)
819 assert(angleEnd>=angleStart);
824 if(angleEnd>=angleStart)
827 assert(angleEnd<=angleStart);
831 /* In GM_COMPATIBLE, don't include bottom and right edges */
832 if(GetGraphicsMode(hdc)==GM_COMPATIBLE)
838 /* Add the arc to the path with one Bezier spline per quadrant that the
844 /* Determine the start and end angles for this quadrant */
847 angleStartQuadrant=angleStart;
848 if(GetArcDirection(hdc)==AD_CLOCKWISE)
849 angleEndQuadrant=(floor(angleStart/M_PI_2)+1.0)*M_PI_2;
851 angleEndQuadrant=(ceil(angleStart/M_PI_2)-1.0)*M_PI_2;
855 angleStartQuadrant=angleEndQuadrant;
856 if(GetArcDirection(hdc)==AD_CLOCKWISE)
857 angleEndQuadrant+=M_PI_2;
859 angleEndQuadrant-=M_PI_2;
862 /* Have we reached the last part of the arc? */
863 if((GetArcDirection(hdc)==AD_CLOCKWISE &&
864 angleEnd<angleEndQuadrant) ||
865 (GetArcDirection(hdc)==AD_COUNTERCLOCKWISE &&
866 angleEnd>angleEndQuadrant))
868 /* Adjust the end angle for this quadrant */
869 angleEndQuadrant=angleEnd;
873 /* Add the Bezier spline to the path */
874 PATH_DoArcPart(pPath, corners, angleStartQuadrant, angleEndQuadrant,
882 BOOL PATH_PolyBezierTo(HDC hdc, const POINT *pts, DWORD cbPoints)
888 if(!PATH_GetPathFromHDC(hdc, &pPath))
891 /* Check that path is open */
892 if(pPath->state!=PATH_Open)
895 /* Add a PT_MOVETO if necessary */
898 pPath->newStroke=FALSE;
899 if(!GetCurrentPositionEx(hdc, &pt) ||
900 !LPtoDP(hdc, &pt, 1))
902 if(!PATH_AddEntry(pPath, &pt, PT_MOVETO))
906 for(i = 0; i < cbPoints; i++) {
908 if(!LPtoDP(hdc, &pt, 1))
910 PATH_AddEntry(pPath, &pt, PT_BEZIERTO);
915 BOOL PATH_PolyBezier(HDC hdc, const POINT *pts, DWORD cbPoints)
921 if(!PATH_GetPathFromHDC(hdc, &pPath))
924 /* Check that path is open */
925 if(pPath->state!=PATH_Open)
928 for(i = 0; i < cbPoints; i++) {
930 if(!LPtoDP(hdc, &pt, 1))
932 PATH_AddEntry(pPath, &pt, (i == 0) ? PT_MOVETO : PT_BEZIERTO);
937 BOOL PATH_Polyline(HDC hdc, const POINT *pts, DWORD cbPoints)
943 if(!PATH_GetPathFromHDC(hdc, &pPath))
946 /* Check that path is open */
947 if(pPath->state!=PATH_Open)
950 for(i = 0; i < cbPoints; i++) {
952 if(!LPtoDP(hdc, &pt, 1))
954 PATH_AddEntry(pPath, &pt, (i == 0) ? PT_MOVETO : PT_LINETO);
959 BOOL PATH_PolylineTo(HDC hdc, const POINT *pts, DWORD cbPoints)
965 if(!PATH_GetPathFromHDC(hdc, &pPath))
968 /* Check that path is open */
969 if(pPath->state!=PATH_Open)
972 /* Add a PT_MOVETO if necessary */
975 pPath->newStroke=FALSE;
976 if(!GetCurrentPositionEx(hdc, &pt) ||
977 !LPtoDP(hdc, &pt, 1))
979 if(!PATH_AddEntry(pPath, &pt, PT_MOVETO))
983 for(i = 0; i < cbPoints; i++) {
985 if(!LPtoDP(hdc, &pt, 1))
987 PATH_AddEntry(pPath, &pt, PT_LINETO);
994 BOOL PATH_Polygon(HDC hdc, const POINT *pts, DWORD cbPoints)
1000 if(!PATH_GetPathFromHDC(hdc, &pPath))
1003 /* Check that path is open */
1004 if(pPath->state!=PATH_Open)
1007 for(i = 0; i < cbPoints; i++) {
1009 if(!LPtoDP(hdc, &pt, 1))
1011 PATH_AddEntry(pPath, &pt, (i == 0) ? PT_MOVETO :
1012 ((i == cbPoints-1) ? PT_LINETO | PT_CLOSEFIGURE :
1018 BOOL PATH_PolyPolygon( HDC hdc, const POINT* pts, const INT* counts,
1025 if(!PATH_GetPathFromHDC(hdc, &pPath))
1028 /* Check that path is open */
1029 if(pPath->state!=PATH_Open)
1032 for(i = 0, poly = 0; poly < polygons; poly++) {
1033 for(point = 0; point < counts[poly]; point++, i++) {
1035 if(!LPtoDP(hdc, &pt, 1))
1037 if(point == 0) startpt = pt;
1038 PATH_AddEntry(pPath, &pt, (point == 0) ? PT_MOVETO : PT_LINETO);
1040 /* win98 adds an extra line to close the figure for some reason */
1041 PATH_AddEntry(pPath, &startpt, PT_LINETO | PT_CLOSEFIGURE);
1046 BOOL PATH_PolyPolyline( HDC hdc, const POINT* pts, const DWORD* counts,
1053 if(!PATH_GetPathFromHDC(hdc, &pPath))
1056 /* Check that path is open */
1057 if(pPath->state!=PATH_Open)
1060 for(i = 0, poly = 0; poly < polylines; poly++) {
1061 for(point = 0; point < counts[poly]; point++, i++) {
1063 if(!LPtoDP(hdc, &pt, 1))
1065 PATH_AddEntry(pPath, &pt, (point == 0) ? PT_MOVETO : PT_LINETO);
1071 /***********************************************************************
1072 * Internal functions
1076 /* PATH_AddFlatBezier
1079 static BOOL PATH_AddFlatBezier(GdiPath *pPath, POINT *pt, BOOL closed)
1084 pts = GDI_Bezier( pt, 4, &no );
1085 if(!pts) return FALSE;
1087 for(i = 1; i < no; i++)
1088 PATH_AddEntry(pPath, &pts[i],
1089 (i == no-1 && closed) ? PT_LINETO | PT_CLOSEFIGURE : PT_LINETO);
1090 HeapFree( GetProcessHeap(), 0, pts );
1096 * Replaces Beziers with line segments
1099 static BOOL PATH_FlattenPath(GdiPath *pPath)
1104 memset(&newPath, 0, sizeof(newPath));
1105 newPath.state = PATH_Open;
1106 for(srcpt = 0; srcpt < pPath->numEntriesUsed; srcpt++) {
1107 switch(pPath->pFlags[srcpt] & ~PT_CLOSEFIGURE) {
1110 PATH_AddEntry(&newPath, &pPath->pPoints[srcpt],
1111 pPath->pFlags[srcpt]);
1114 PATH_AddFlatBezier(&newPath, &pPath->pPoints[srcpt-1],
1115 pPath->pFlags[srcpt+2] & PT_CLOSEFIGURE);
1120 newPath.state = PATH_Closed;
1121 PATH_AssignGdiPath(pPath, &newPath);
1122 PATH_EmptyPath(&newPath);
1126 /* PATH_PathToRegion
1128 * Creates a region from the specified path using the specified polygon
1129 * filling mode. The path is left unchanged. A handle to the region that
1130 * was created is stored in *pHrgn. If successful, TRUE is returned; if an
1131 * error occurs, SetLastError is called with the appropriate value and
1132 * FALSE is returned.
1134 static BOOL PATH_PathToRegion(GdiPath *pPath, INT nPolyFillMode,
1137 int numStrokes, iStroke, i;
1138 INT *pNumPointsInStroke;
1141 assert(pPath!=NULL);
1142 assert(pHrgn!=NULL);
1144 PATH_FlattenPath(pPath);
1146 /* FIXME: What happens when number of points is zero? */
1148 /* First pass: Find out how many strokes there are in the path */
1149 /* FIXME: We could eliminate this with some bookkeeping in GdiPath */
1151 for(i=0; i<pPath->numEntriesUsed; i++)
1152 if((pPath->pFlags[i] & ~PT_CLOSEFIGURE) == PT_MOVETO)
1155 /* Allocate memory for number-of-points-in-stroke array */
1156 pNumPointsInStroke=(int *)HeapAlloc( GetProcessHeap(), 0,
1157 sizeof(int) * numStrokes );
1158 if(!pNumPointsInStroke)
1160 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
1164 /* Second pass: remember number of points in each polygon */
1165 iStroke=-1; /* Will get incremented to 0 at beginning of first stroke */
1166 for(i=0; i<pPath->numEntriesUsed; i++)
1168 /* Is this the beginning of a new stroke? */
1169 if((pPath->pFlags[i] & ~PT_CLOSEFIGURE) == PT_MOVETO)
1172 pNumPointsInStroke[iStroke]=0;
1175 pNumPointsInStroke[iStroke]++;
1178 /* Create a region from the strokes */
1179 hrgn=CreatePolyPolygonRgn(pPath->pPoints, pNumPointsInStroke,
1180 numStrokes, nPolyFillMode);
1183 SetLastError(ERROR_NOT_ENOUGH_MEMORY);
1187 /* Free memory for number-of-points-in-stroke array */
1188 HeapFree( GetProcessHeap(), 0, pNumPointsInStroke );
1197 * Removes all entries from the path and sets the path state to PATH_Null.
1199 static void PATH_EmptyPath(GdiPath *pPath)
1201 assert(pPath!=NULL);
1203 pPath->state=PATH_Null;
1204 pPath->numEntriesUsed=0;
1209 * Adds an entry to the path. For "flags", pass either PT_MOVETO, PT_LINETO
1210 * or PT_BEZIERTO, optionally ORed with PT_CLOSEFIGURE. Returns TRUE if
1211 * successful, FALSE otherwise (e.g. if not enough memory was available).
1213 BOOL PATH_AddEntry(GdiPath *pPath, const POINT *pPoint, BYTE flags)
1215 assert(pPath!=NULL);
1217 /* FIXME: If newStroke is true, perhaps we want to check that we're
1218 * getting a PT_MOVETO
1220 TRACE("(%ld,%ld) - %d\n", pPoint->x, pPoint->y, flags);
1222 /* Check that path is open */
1223 if(pPath->state!=PATH_Open)
1226 /* Reserve enough memory for an extra path entry */
1227 if(!PATH_ReserveEntries(pPath, pPath->numEntriesUsed+1))
1230 /* Store information in path entry */
1231 pPath->pPoints[pPath->numEntriesUsed]=*pPoint;
1232 pPath->pFlags[pPath->numEntriesUsed]=flags;
1234 /* If this is PT_CLOSEFIGURE, we have to start a new stroke next time */
1235 if((flags & PT_CLOSEFIGURE) == PT_CLOSEFIGURE)
1236 pPath->newStroke=TRUE;
1238 /* Increment entry count */
1239 pPath->numEntriesUsed++;
1244 /* PATH_ReserveEntries
1246 * Ensures that at least "numEntries" entries (for points and flags) have
1247 * been allocated; allocates larger arrays and copies the existing entries
1248 * to those arrays, if necessary. Returns TRUE if successful, else FALSE.
1250 static BOOL PATH_ReserveEntries(GdiPath *pPath, INT numEntries)
1252 INT numEntriesToAllocate;
1256 assert(pPath!=NULL);
1257 assert(numEntries>=0);
1259 /* Do we have to allocate more memory? */
1260 if(numEntries > pPath->numEntriesAllocated)
1262 /* Find number of entries to allocate. We let the size of the array
1263 * grow exponentially, since that will guarantee linear time
1265 if(pPath->numEntriesAllocated)
1267 numEntriesToAllocate=pPath->numEntriesAllocated;
1268 while(numEntriesToAllocate<numEntries)
1269 numEntriesToAllocate=numEntriesToAllocate*GROW_FACTOR_NUMER/
1273 numEntriesToAllocate=numEntries;
1275 /* Allocate new arrays */
1276 pPointsNew=(POINT *)HeapAlloc( GetProcessHeap(), 0,
1277 numEntriesToAllocate * sizeof(POINT) );
1280 pFlagsNew=(BYTE *)HeapAlloc( GetProcessHeap(), 0,
1281 numEntriesToAllocate * sizeof(BYTE) );
1284 HeapFree( GetProcessHeap(), 0, pPointsNew );
1288 /* Copy old arrays to new arrays and discard old arrays */
1291 assert(pPath->pFlags);
1293 memcpy(pPointsNew, pPath->pPoints,
1294 sizeof(POINT)*pPath->numEntriesUsed);
1295 memcpy(pFlagsNew, pPath->pFlags,
1296 sizeof(BYTE)*pPath->numEntriesUsed);
1298 HeapFree( GetProcessHeap(), 0, pPath->pPoints );
1299 HeapFree( GetProcessHeap(), 0, pPath->pFlags );
1301 pPath->pPoints=pPointsNew;
1302 pPath->pFlags=pFlagsNew;
1303 pPath->numEntriesAllocated=numEntriesToAllocate;
1309 /* PATH_GetPathFromHDC
1311 * Retrieves a pointer to the GdiPath structure contained in an HDC and
1312 * places it in *ppPath. TRUE is returned if successful, FALSE otherwise.
1314 static BOOL PATH_GetPathFromHDC(HDC hdc, GdiPath **ppPath)
1318 pDC=DC_GetDCPtr(hdc);
1321 *ppPath=&pDC->w.path;
1330 * Creates a Bezier spline that corresponds to part of an arc and appends the
1331 * corresponding points to the path. The start and end angles are passed in
1332 * "angleStart" and "angleEnd"; these angles should span a quarter circle
1333 * at most. If "addMoveTo" is true, a PT_MOVETO entry for the first control
1334 * point is added to the path; otherwise, it is assumed that the current
1335 * position is equal to the first control point.
1337 static BOOL PATH_DoArcPart(GdiPath *pPath, FLOAT_POINT corners[],
1338 double angleStart, double angleEnd, BOOL addMoveTo)
1340 double halfAngle, a;
1341 double xNorm[4], yNorm[4];
1345 assert(fabs(angleEnd-angleStart)<=M_PI_2);
1347 /* FIXME: Is there an easier way of computing this? */
1349 /* Compute control points */
1350 halfAngle=(angleEnd-angleStart)/2.0;
1351 if(fabs(halfAngle)>1e-8)
1353 a=4.0/3.0*(1-cos(halfAngle))/sin(halfAngle);
1354 xNorm[0]=cos(angleStart);
1355 yNorm[0]=sin(angleStart);
1356 xNorm[1]=xNorm[0] - a*yNorm[0];
1357 yNorm[1]=yNorm[0] + a*xNorm[0];
1358 xNorm[3]=cos(angleEnd);
1359 yNorm[3]=sin(angleEnd);
1360 xNorm[2]=xNorm[3] + a*yNorm[3];
1361 yNorm[2]=yNorm[3] - a*xNorm[3];
1366 xNorm[i]=cos(angleStart);
1367 yNorm[i]=sin(angleStart);
1370 /* Add starting point to path if desired */
1373 PATH_ScaleNormalizedPoint(corners, xNorm[0], yNorm[0], &point);
1374 if(!PATH_AddEntry(pPath, &point, PT_MOVETO))
1378 /* Add remaining control points */
1381 PATH_ScaleNormalizedPoint(corners, xNorm[i], yNorm[i], &point);
1382 if(!PATH_AddEntry(pPath, &point, PT_BEZIERTO))
1389 /* PATH_ScaleNormalizedPoint
1391 * Scales a normalized point (x, y) with respect to the box whose corners are
1392 * passed in "corners". The point is stored in "*pPoint". The normalized
1393 * coordinates (-1.0, -1.0) correspond to corners[0], the coordinates
1394 * (1.0, 1.0) correspond to corners[1].
1396 static void PATH_ScaleNormalizedPoint(FLOAT_POINT corners[], double x,
1397 double y, POINT *pPoint)
1399 pPoint->x=GDI_ROUND( (double)corners[0].x +
1400 (double)(corners[1].x-corners[0].x)*0.5*(x+1.0) );
1401 pPoint->y=GDI_ROUND( (double)corners[0].y +
1402 (double)(corners[1].y-corners[0].y)*0.5*(y+1.0) );
1405 /* PATH_NormalizePoint
1407 * Normalizes a point with respect to the box whose corners are passed in
1408 * "corners". The normalized coordinates are stored in "*pX" and "*pY".
1410 static void PATH_NormalizePoint(FLOAT_POINT corners[],
1411 const FLOAT_POINT *pPoint,
1412 double *pX, double *pY)
1414 *pX=(double)(pPoint->x-corners[0].x)/(double)(corners[1].x-corners[0].x) *
1416 *pY=(double)(pPoint->y-corners[0].y)/(double)(corners[1].y-corners[0].y) *
1420 /*******************************************************************
1421 * FlattenPath16 [GDI.516]
1425 BOOL16 WINAPI FlattenPath16(HDC16 hdc)
1427 return (BOOL16) FlattenPath((HDC) hdc);
1430 /*******************************************************************
1431 * FlattenPath [GDI32.103]
1435 BOOL WINAPI FlattenPath(HDC hdc)
1437 DC *dc = DC_GetDCPtr( hdc );
1439 TRACE("%08x\n", hdc);
1442 SetLastError(ERROR_INVALID_HANDLE);
1446 if(dc->funcs->pFlattenPath)
1447 return dc->funcs->pFlattenPath(dc);
1449 pPath = &dc->w.path;
1450 if(pPath->state != PATH_Closed)
1452 return PATH_FlattenPath(pPath);
1456 static BOOL PATH_StrokePath(HDC hdc, GdiPath *pPath)
1459 POINT ptLastMove = {0,0};
1461 if(pPath->state != PATH_Closed)
1465 SetMapMode(hdc, MM_TEXT);
1466 SetViewportOrgEx(hdc, 0, 0, NULL);
1467 SetWindowOrgEx(hdc, 0, 0, NULL);
1468 for(i = 0; i < pPath->numEntriesUsed; i++) {
1469 switch(pPath->pFlags[i]) {
1471 TRACE("Got PT_MOVETO (%ld, %ld)\n",
1472 pPath->pPoints[i].x, pPath->pPoints[i].y);
1473 MoveToEx(hdc, pPath->pPoints[i].x, pPath->pPoints[i].y, NULL);
1474 ptLastMove = pPath->pPoints[i];
1477 case (PT_LINETO | PT_CLOSEFIGURE):
1478 TRACE("Got PT_LINETO (%ld, %ld)\n",
1479 pPath->pPoints[i].x, pPath->pPoints[i].y);
1480 LineTo(hdc, pPath->pPoints[i].x, pPath->pPoints[i].y);
1483 TRACE("Got PT_BEZIERTO\n");
1484 if(pPath->pFlags[i+1] != PT_BEZIERTO ||
1485 (pPath->pFlags[i+2] & ~PT_CLOSEFIGURE) != PT_BEZIERTO) {
1486 ERR("Path didn't contain 3 successive PT_BEZIERTOs\n");
1489 PolyBezierTo(hdc, &pPath->pPoints[i], 3);
1493 ERR("Got path flag %d\n", (INT)pPath->pFlags[i]);
1496 if(pPath->pFlags[i] & PT_CLOSEFIGURE)
1497 LineTo(hdc, ptLastMove.x, ptLastMove.y);
1504 /*******************************************************************
1505 * StrokeAndFillPath16 [GDI.520]
1509 BOOL16 WINAPI StrokeAndFillPath16(HDC16 hdc)
1511 return (BOOL16) StrokeAndFillPath((HDC) hdc);
1514 /*******************************************************************
1515 * StrokeAndFillPath [GDI32.352]
1519 BOOL WINAPI StrokeAndFillPath(HDC hdc)
1521 DC *dc = DC_GetDCPtr( hdc );
1525 SetLastError(ERROR_INVALID_HANDLE);
1529 if(dc->funcs->pStrokeAndFillPath)
1530 return dc->funcs->pStrokeAndFillPath(dc);
1532 bRet = PATH_FillPath(hdc, &dc->w.path);
1533 if(bRet) bRet = PATH_StrokePath(hdc, &dc->w.path);
1534 if(bRet) PATH_EmptyPath(&dc->w.path);
1538 /*******************************************************************
1539 * StrokePath16 [GDI.521]
1543 BOOL16 WINAPI StrokePath16(HDC16 hdc)
1545 return (BOOL16) StrokePath((HDC) hdc);
1548 /*******************************************************************
1549 * StrokePath [GDI32.353]
1553 BOOL WINAPI StrokePath(HDC hdc)
1555 DC *dc = DC_GetDCPtr( hdc );
1558 TRACE("(%08x)\n", hdc);
1560 SetLastError(ERROR_INVALID_HANDLE);
1564 if(dc->funcs->pStrokePath)
1565 return dc->funcs->pStrokePath(dc);
1567 pPath = &dc->w.path;
1568 PATH_StrokePath(hdc, pPath);
1569 PATH_EmptyPath(pPath);
1573 /*******************************************************************
1574 * WidenPath16 [GDI.522]
1578 BOOL16 WINAPI WidenPath16(HDC16 hdc)
1580 return (BOOL16) WidenPath((HDC) hdc);
1583 /*******************************************************************
1584 * WidenPath [GDI32.360]
1588 BOOL WINAPI WidenPath(HDC hdc)
1590 DC *dc = DC_GetDCPtr( hdc );
1593 SetLastError(ERROR_INVALID_HANDLE);
1597 if(dc->funcs->pWidenPath)
1598 return dc->funcs->pWidenPath(dc);