/* * Graphics paths (BeginPath, EndPath etc.) * * Copyright 1997, 1998 Martin Boehme */ #include #include #include #include "config.h" #if defined(HAVE_FLOAT_H) #include #endif #include "winbase.h" #include "wingdi.h" #include "winerror.h" #include "dc.h" #include "debugtools.h" #include "path.h" DEFAULT_DEBUG_CHANNEL(gdi) /* Notes on the implementation * * The implementation is based on dynamically resizable arrays of points and * flags. I dithered for a bit before deciding on this implementation, and * I had even done a bit of work on a linked list version before switching * to arrays. It's a bit of a tradeoff. When you use linked lists, the * implementation of FlattenPath is easier, because you can rip the * PT_BEZIERTO entries out of the middle of the list and link the * corresponding PT_LINETO entries in. However, when you use arrays, * PathToRegion becomes easier, since you can essentially just pass your array * of points to CreatePolyPolygonRgn. Also, if I'd used linked lists, I would * have had the extra effort of creating a chunk-based allocation scheme * in order to use memory effectively. That's why I finally decided to use * arrays. Note by the way that the array based implementation has the same * linear time complexity that linked lists would have since the arrays grow * exponentially. * * The points are stored in the path in device coordinates. This is * consistent with the way Windows does things (for instance, see the Win32 * SDK documentation for GetPath). * * The word "stroke" appears in several places (e.g. in the flag * GdiPath.newStroke). A stroke consists of a PT_MOVETO followed by one or * more PT_LINETOs or PT_BEZIERTOs, up to, but not including, the next * PT_MOVETO. Note that this is not the same as the definition of a figure; * a figure can contain several strokes. * * I modified the drawing functions (MoveTo, LineTo etc.) to test whether * the path is open and to call the corresponding function in path.c if this * is the case. A more elegant approach would be to modify the function * pointers in the DC_FUNCTIONS structure; however, this would be a lot more * complex. Also, the performance degradation caused by my approach in the * case where no path is open is so small that it cannot be measured. * * Martin Boehme */ /* FIXME: A lot of stuff isn't implemented yet. There is much more to come. */ #define NUM_ENTRIES_INITIAL 16 /* Initial size of points / flags arrays */ #define GROW_FACTOR_NUMER 2 /* Numerator of grow factor for the array */ #define GROW_FACTOR_DENOM 1 /* Denominator of grow factor */ static BOOL PATH_PathToRegion(const GdiPath *pPath, INT nPolyFillMode, HRGN *pHrgn); static void PATH_EmptyPath(GdiPath *pPath); static BOOL PATH_AddEntry(GdiPath *pPath, const POINT *pPoint, BYTE flags); static BOOL PATH_ReserveEntries(GdiPath *pPath, INT numEntries); static BOOL PATH_GetPathFromHDC(HDC hdc, GdiPath **ppPath); static BOOL PATH_DoArcPart(GdiPath *pPath, FLOAT_POINT corners[], double angleStart, double angleEnd, BOOL addMoveTo); static void PATH_ScaleNormalizedPoint(FLOAT_POINT corners[], double x, double y, POINT *pPoint); static void PATH_NormalizePoint(FLOAT_POINT corners[], const FLOAT_POINT *pPoint, double *pX, double *pY); /*********************************************************************** * BeginPath16 (GDI.512) */ BOOL16 WINAPI BeginPath16(HDC16 hdc) { return (BOOL16)BeginPath((HDC)hdc); } /*********************************************************************** * BeginPath (GDI32.9) */ BOOL WINAPI BeginPath(HDC hdc) { DC *dc = DC_GetDCPtr( hdc ); GdiPath *pPath; if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pBeginPath) return dc->funcs->pBeginPath(dc); pPath = &dc->w.path; /* If path is already open, do nothing */ if(pPath->state==PATH_Open) return TRUE; /* Make sure that path is empty */ PATH_EmptyPath(pPath); /* Initialize variables for new path */ pPath->newStroke=TRUE; pPath->state=PATH_Open; return TRUE; } /*********************************************************************** * EndPath16 (GDI.514) */ BOOL16 WINAPI EndPath16(HDC16 hdc) { return (BOOL16)EndPath((HDC)hdc); } /*********************************************************************** * EndPath (GDI32.78) */ BOOL WINAPI EndPath(HDC hdc) { DC *dc = DC_GetDCPtr( hdc ); GdiPath *pPath; if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pEndPath) return dc->funcs->pEndPath(dc); pPath = &dc->w.path; /* Check that path is currently being constructed */ if(pPath->state!=PATH_Open) { SetLastError(ERROR_CAN_NOT_COMPLETE); return FALSE; } /* Set flag to indicate that path is finished */ pPath->state=PATH_Closed; return TRUE; } /*********************************************************************** * AbortPath16 (GDI.511) */ BOOL16 WINAPI AbortPath16(HDC16 hdc) { return (BOOL16)AbortPath((HDC)hdc); } /****************************************************************************** * AbortPath [GDI32.1] * Closes and discards paths from device context * * NOTES * Check that SetLastError is being called correctly * * PARAMS * hdc [I] Handle to device context * * RETURNS STD */ BOOL WINAPI AbortPath( HDC hdc ) { DC *dc = DC_GetDCPtr( hdc ); GdiPath *pPath; if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pAbortPath) return dc->funcs->pAbortPath(dc); pPath = &dc->w.path; /* Remove all entries from the path */ PATH_EmptyPath(pPath); return TRUE; } /*********************************************************************** * CloseFigure16 (GDI.513) */ BOOL16 WINAPI CloseFigure16(HDC16 hdc) { return (BOOL16)CloseFigure((HDC)hdc); } /*********************************************************************** * CloseFigure (GDI32.16) * * FIXME: Check that SetLastError is being called correctly */ BOOL WINAPI CloseFigure(HDC hdc) { DC *dc = DC_GetDCPtr( hdc ); GdiPath *pPath; if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pCloseFigure) return dc->funcs->pCloseFigure(dc); pPath = &dc->w.path; /* Check that path is open */ if(pPath->state!=PATH_Open) { SetLastError(ERROR_CAN_NOT_COMPLETE); return FALSE; } /* FIXME: Shouldn't we draw a line to the beginning of the figure? */ /* Set PT_CLOSEFIGURE on the last entry and start a new stroke */ if(pPath->numEntriesUsed) { pPath->pFlags[pPath->numEntriesUsed-1]|=PT_CLOSEFIGURE; pPath->newStroke=TRUE; } return TRUE; } /*********************************************************************** * GetPath16 (GDI.517) */ INT16 WINAPI GetPath16(HDC16 hdc, LPPOINT16 pPoints, LPBYTE pTypes, INT16 nSize) { FIXME("(%d,%p,%p): stub\n",hdc,pPoints,pTypes); return 0; } /*********************************************************************** * GetPath (GDI32.210) */ INT WINAPI GetPath(HDC hdc, LPPOINT pPoints, LPBYTE pTypes, INT nSize) { GdiPath *pPath; /* Get pointer to path */ if(!PATH_GetPathFromHDC(hdc, &pPath)) { SetLastError(ERROR_INVALID_PARAMETER); return -1; } /* Check that path is closed */ if(pPath->state!=PATH_Closed) { SetLastError(ERROR_CAN_NOT_COMPLETE); return -1; } if(nSize==0) return pPath->numEntriesUsed; else if(nSizenumEntriesUsed) { SetLastError(ERROR_INVALID_PARAMETER); return -1; } else { memcpy(pPoints, pPath->pPoints, sizeof(POINT)*pPath->numEntriesUsed); memcpy(pTypes, pPath->pFlags, sizeof(BYTE)*pPath->numEntriesUsed); /* Convert the points to logical coordinates */ if(!DPtoLP(hdc, pPoints, pPath->numEntriesUsed)) { /* FIXME: Is this the correct value? */ SetLastError(ERROR_CAN_NOT_COMPLETE); return -1; } return pPath->numEntriesUsed; } } /*********************************************************************** * PathToRegion16 (GDI.518) */ HRGN16 WINAPI PathToRegion16(HDC16 hdc) { return (HRGN16) PathToRegion((HDC) hdc); } /*********************************************************************** * PathToRegion (GDI32.261) * * FIXME * Check that SetLastError is being called correctly * * The documentation does not state this explicitly, but a test under Windows * shows that the region which is returned should be in device coordinates. */ HRGN WINAPI PathToRegion(HDC hdc) { GdiPath *pPath; HRGN hrgnRval; /* Get pointer to path */ if(!PATH_GetPathFromHDC(hdc, &pPath)) { SetLastError(ERROR_INVALID_PARAMETER); return 0; } /* Check that path is closed */ if(pPath->state!=PATH_Closed) { SetLastError(ERROR_CAN_NOT_COMPLETE); return 0; } /* FIXME: Should we empty the path even if conversion failed? */ if(PATH_PathToRegion(pPath, GetPolyFillMode(hdc), &hrgnRval)) PATH_EmptyPath(pPath); else hrgnRval=0; return hrgnRval; } /*********************************************************************** * FillPath16 (GDI.515) */ BOOL16 WINAPI FillPath16(HDC16 hdc) { return (BOOL16) FillPath((HDC) hdc); } /*********************************************************************** * FillPath (GDI32.100) * * FIXME * Check that SetLastError is being called correctly */ BOOL WINAPI FillPath(HDC hdc) { GdiPath *pPath; INT mapMode, graphicsMode; SIZE ptViewportExt, ptWindowExt; POINT ptViewportOrg, ptWindowOrg; XFORM xform; HRGN hrgn; DC *dc = DC_GetDCPtr( hdc ); if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pFillPath) return dc->funcs->pFillPath(dc); pPath = &dc->w.path; /* Check that path is closed */ if(pPath->state!=PATH_Closed) { SetLastError(ERROR_CAN_NOT_COMPLETE); return FALSE; } /* Construct a region from the path and fill it */ if(PATH_PathToRegion(pPath, GetPolyFillMode(hdc), &hrgn)) { /* Since PaintRgn interprets the region as being in logical coordinates * but the points we store for the path are already in device * coordinates, we have to set the mapping mode to MM_TEXT temporarily. * Using SaveDC to save information about the mapping mode / world * transform would be easier but would require more overhead, especially * now that SaveDC saves the current path. */ /* Save the information about the old mapping mode */ mapMode=GetMapMode(hdc); GetViewportExtEx(hdc, &ptViewportExt); GetViewportOrgEx(hdc, &ptViewportOrg); GetWindowExtEx(hdc, &ptWindowExt); GetWindowOrgEx(hdc, &ptWindowOrg); /* Save world transform * NB: The Windows documentation on world transforms would lead one to * believe that this has to be done only in GM_ADVANCED; however, my * tests show that resetting the graphics mode to GM_COMPATIBLE does * not reset the world transform. */ GetWorldTransform(hdc, &xform); /* Set MM_TEXT */ SetMapMode(hdc, MM_TEXT); SetViewportOrgEx(hdc, 0, 0, NULL); SetWindowOrgEx(hdc, 0, 0, NULL); /* Paint the region */ PaintRgn(hdc, hrgn); /* Restore the old mapping mode */ SetMapMode(hdc, mapMode); SetViewportExtEx(hdc, ptViewportExt.cx, ptViewportExt.cy, NULL); SetViewportOrgEx(hdc, ptViewportOrg.x, ptViewportOrg.y, NULL); SetWindowExtEx(hdc, ptWindowExt.cx, ptWindowExt.cy, NULL); SetWindowOrgEx(hdc, ptWindowOrg.x, ptWindowOrg.y, NULL); /* Go to GM_ADVANCED temporarily to restore the world transform */ graphicsMode=GetGraphicsMode(hdc); SetGraphicsMode(hdc, GM_ADVANCED); SetWorldTransform(hdc, &xform); SetGraphicsMode(hdc, graphicsMode); /* Empty the path */ PATH_EmptyPath(pPath); return TRUE; } else { /* FIXME: Should the path be emptied even if conversion failed? */ /* PATH_EmptyPath(pPath); */ return FALSE; } } /*********************************************************************** * SelectClipPath16 (GDI.519) */ BOOL16 WINAPI SelectClipPath16(HDC16 hdc, INT16 iMode) { return (BOOL16) SelectClipPath((HDC) hdc, iMode); } /*********************************************************************** * SelectClipPath (GDI32.296) * FIXME * Check that SetLastError is being called correctly */ BOOL WINAPI SelectClipPath(HDC hdc, INT iMode) { GdiPath *pPath; HRGN hrgnPath; BOOL success; DC *dc = DC_GetDCPtr( hdc ); if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pSelectClipPath) return dc->funcs->pSelectClipPath(dc, iMode); pPath = &dc->w.path; /* Check that path is closed */ if(pPath->state!=PATH_Closed) { SetLastError(ERROR_CAN_NOT_COMPLETE); return FALSE; } /* Construct a region from the path */ if(PATH_PathToRegion(pPath, GetPolyFillMode(hdc), &hrgnPath)) { success = ExtSelectClipRgn( hdc, hrgnPath, iMode ) != ERROR; DeleteObject(hrgnPath); /* Empty the path */ if(success) PATH_EmptyPath(pPath); /* FIXME: Should this function delete the path even if it failed? */ return success; } else return FALSE; } /*********************************************************************** * Exported functions */ /* PATH_InitGdiPath * * Initializes the GdiPath structure. */ void PATH_InitGdiPath(GdiPath *pPath) { assert(pPath!=NULL); pPath->state=PATH_Null; pPath->pPoints=NULL; pPath->pFlags=NULL; pPath->numEntriesUsed=0; pPath->numEntriesAllocated=0; } /* PATH_DestroyGdiPath * * Destroys a GdiPath structure (frees the memory in the arrays). */ void PATH_DestroyGdiPath(GdiPath *pPath) { assert(pPath!=NULL); HeapFree( GetProcessHeap(), 0, pPath->pPoints ); HeapFree( GetProcessHeap(), 0, pPath->pFlags ); } /* PATH_AssignGdiPath * * Copies the GdiPath structure "pPathSrc" to "pPathDest". A deep copy is * performed, i.e. the contents of the pPoints and pFlags arrays are copied, * not just the pointers. Since this means that the arrays in pPathDest may * need to be resized, pPathDest should have been initialized using * PATH_InitGdiPath (in C++, this function would be an assignment operator, * not a copy constructor). * Returns TRUE if successful, else FALSE. */ BOOL PATH_AssignGdiPath(GdiPath *pPathDest, const GdiPath *pPathSrc) { assert(pPathDest!=NULL && pPathSrc!=NULL); /* Make sure destination arrays are big enough */ if(!PATH_ReserveEntries(pPathDest, pPathSrc->numEntriesUsed)) return FALSE; /* Perform the copy operation */ memcpy(pPathDest->pPoints, pPathSrc->pPoints, sizeof(POINT)*pPathSrc->numEntriesUsed); memcpy(pPathDest->pFlags, pPathSrc->pFlags, sizeof(BYTE)*pPathSrc->numEntriesUsed); pPathDest->state=pPathSrc->state; pPathDest->numEntriesUsed=pPathSrc->numEntriesUsed; pPathDest->newStroke=pPathSrc->newStroke; return TRUE; } /* PATH_MoveTo * * Should be called when a MoveTo is performed on a DC that has an * open path. This starts a new stroke. Returns TRUE if successful, else * FALSE. */ BOOL PATH_MoveTo(HDC hdc) { GdiPath *pPath; /* Get pointer to path */ if(!PATH_GetPathFromHDC(hdc, &pPath)) return FALSE; /* Check that path is open */ if(pPath->state!=PATH_Open) /* FIXME: Do we have to call SetLastError? */ return FALSE; /* Start a new stroke */ pPath->newStroke=TRUE; return TRUE; } /* PATH_LineTo * * Should be called when a LineTo is performed on a DC that has an * open path. This adds a PT_LINETO entry to the path (and possibly * a PT_MOVETO entry, if this is the first LineTo in a stroke). * Returns TRUE if successful, else FALSE. */ BOOL PATH_LineTo(HDC hdc, INT x, INT y) { GdiPath *pPath; POINT point, pointCurPos; /* Get pointer to path */ if(!PATH_GetPathFromHDC(hdc, &pPath)) return FALSE; /* Check that path is open */ if(pPath->state!=PATH_Open) return FALSE; /* Convert point to device coordinates */ point.x=x; point.y=y; if(!LPtoDP(hdc, &point, 1)) return FALSE; /* Add a PT_MOVETO if necessary */ if(pPath->newStroke) { pPath->newStroke=FALSE; if(!GetCurrentPositionEx(hdc, &pointCurPos) || !LPtoDP(hdc, &pointCurPos, 1)) return FALSE; if(!PATH_AddEntry(pPath, &pointCurPos, PT_MOVETO)) return FALSE; } /* Add a PT_LINETO entry */ return PATH_AddEntry(pPath, &point, PT_LINETO); } /* PATH_Rectangle * * Should be called when a call to Rectangle is performed on a DC that has * an open path. Returns TRUE if successful, else FALSE. */ BOOL PATH_Rectangle(HDC hdc, INT x1, INT y1, INT x2, INT y2) { GdiPath *pPath; POINT corners[2], pointTemp; INT temp; /* Get pointer to path */ if(!PATH_GetPathFromHDC(hdc, &pPath)) return FALSE; /* Check that path is open */ if(pPath->state!=PATH_Open) return FALSE; /* Convert points to device coordinates */ corners[0].x=x1; corners[0].y=y1; corners[1].x=x2; corners[1].y=y2; if(!LPtoDP(hdc, corners, 2)) return FALSE; /* Make sure first corner is top left and second corner is bottom right */ if(corners[0].x>corners[1].x) { temp=corners[0].x; corners[0].x=corners[1].x; corners[1].x=temp; } if(corners[0].y>corners[1].y) { temp=corners[0].y; corners[0].y=corners[1].y; corners[1].y=temp; } /* In GM_COMPATIBLE, don't include bottom and right edges */ if(GetGraphicsMode(hdc)==GM_COMPATIBLE) { corners[1].x--; corners[1].y--; } /* Close any previous figure */ if(!CloseFigure(hdc)) { /* The CloseFigure call shouldn't have failed */ assert(FALSE); return FALSE; } /* Add four points to the path */ pointTemp.x=corners[1].x; pointTemp.y=corners[0].y; if(!PATH_AddEntry(pPath, &pointTemp, PT_MOVETO)) return FALSE; if(!PATH_AddEntry(pPath, corners, PT_LINETO)) return FALSE; pointTemp.x=corners[0].x; pointTemp.y=corners[1].y; if(!PATH_AddEntry(pPath, &pointTemp, PT_LINETO)) return FALSE; if(!PATH_AddEntry(pPath, corners+1, PT_LINETO)) return FALSE; /* Close the rectangle figure */ if(!CloseFigure(hdc)) { /* The CloseFigure call shouldn't have failed */ assert(FALSE); return FALSE; } return TRUE; } /* PATH_Ellipse * * Should be called when a call to Ellipse is performed on a DC that has * an open path. This adds four Bezier splines representing the ellipse * to the path. Returns TRUE if successful, else FALSE. */ BOOL PATH_Ellipse(HDC hdc, INT x1, INT y1, INT x2, INT y2) { /* TODO: This should probably be revised to call PATH_AngleArc */ /* (once it exists) */ return PATH_Arc(hdc, x1, y1, x2, y2, x1, (y1+y2)/2, x1, (y1+y2)/2); } /* PATH_Arc * * Should be called when a call to Arc is performed on a DC that has * an open path. This adds up to five Bezier splines representing the arc * to the path. Returns TRUE if successful, else FALSE. */ BOOL PATH_Arc(HDC hdc, INT x1, INT y1, INT x2, INT y2, INT xStart, INT yStart, INT xEnd, INT yEnd) { GdiPath *pPath; DC *pDC; double angleStart, angleEnd, angleStartQuadrant, angleEndQuadrant=0.0; /* Initialize angleEndQuadrant to silence gcc's warning */ double x, y; FLOAT_POINT corners[2], pointStart, pointEnd; BOOL start, end; INT temp; /* FIXME: This function should check for all possible error returns */ /* FIXME: Do we have to respect newStroke? */ /* Get pointer to DC */ pDC=DC_GetDCPtr(hdc); if(pDC==NULL) return FALSE; /* Get pointer to path */ if(!PATH_GetPathFromHDC(hdc, &pPath)) return FALSE; /* Check that path is open */ if(pPath->state!=PATH_Open) return FALSE; /* FIXME: Do we have to close the current figure? */ /* Check for zero height / width */ /* FIXME: Only in GM_COMPATIBLE? */ if(x1==x2 || y1==y2) return TRUE; /* Convert points to device coordinates */ corners[0].x=(FLOAT)x1; corners[0].y=(FLOAT)y1; corners[1].x=(FLOAT)x2; corners[1].y=(FLOAT)y2; pointStart.x=(FLOAT)xStart; pointStart.y=(FLOAT)yStart; pointEnd.x=(FLOAT)xEnd; pointEnd.y=(FLOAT)yEnd; INTERNAL_LPTODP_FLOAT(pDC, corners); INTERNAL_LPTODP_FLOAT(pDC, corners+1); INTERNAL_LPTODP_FLOAT(pDC, &pointStart); INTERNAL_LPTODP_FLOAT(pDC, &pointEnd); /* Make sure first corner is top left and second corner is bottom right */ if(corners[0].x>corners[1].x) { temp=corners[0].x; corners[0].x=corners[1].x; corners[1].x=temp; } if(corners[0].y>corners[1].y) { temp=corners[0].y; corners[0].y=corners[1].y; corners[1].y=temp; } /* Compute start and end angle */ PATH_NormalizePoint(corners, &pointStart, &x, &y); angleStart=atan2(y, x); PATH_NormalizePoint(corners, &pointEnd, &x, &y); angleEnd=atan2(y, x); /* Make sure the end angle is "on the right side" of the start angle */ if(GetArcDirection(hdc)==AD_CLOCKWISE) { if(angleEnd<=angleStart) { angleEnd+=2*M_PI; assert(angleEnd>=angleStart); } } else { if(angleEnd>=angleStart) { angleEnd-=2*M_PI; assert(angleEnd<=angleStart); } } /* In GM_COMPATIBLE, don't include bottom and right edges */ if(GetGraphicsMode(hdc)==GM_COMPATIBLE) { corners[1].x--; corners[1].y--; } /* Add the arc to the path with one Bezier spline per quadrant that the * arc spans */ start=TRUE; end=FALSE; do { /* Determine the start and end angles for this quadrant */ if(start) { angleStartQuadrant=angleStart; if(GetArcDirection(hdc)==AD_CLOCKWISE) angleEndQuadrant=(floor(angleStart/M_PI_2)+1.0)*M_PI_2; else angleEndQuadrant=(ceil(angleStart/M_PI_2)-1.0)*M_PI_2; } else { angleStartQuadrant=angleEndQuadrant; if(GetArcDirection(hdc)==AD_CLOCKWISE) angleEndQuadrant+=M_PI_2; else angleEndQuadrant-=M_PI_2; } /* Have we reached the last part of the arc? */ if((GetArcDirection(hdc)==AD_CLOCKWISE && angleEndangleEndQuadrant)) { /* Adjust the end angle for this quadrant */ angleEndQuadrant=angleEnd; end=TRUE; } /* Add the Bezier spline to the path */ PATH_DoArcPart(pPath, corners, angleStartQuadrant, angleEndQuadrant, start); start=FALSE; } while(!end); return TRUE; } BOOL PATH_PolyBezierTo(HDC hdc, const POINT *pts, DWORD cbPoints) { GdiPath *pPath; POINT pt; INT i; if(!PATH_GetPathFromHDC(hdc, &pPath)) return FALSE; /* Check that path is open */ if(pPath->state!=PATH_Open) return FALSE; /* Add a PT_MOVETO if necessary */ if(pPath->newStroke) { pPath->newStroke=FALSE; if(!GetCurrentPositionEx(hdc, &pt) || !LPtoDP(hdc, &pt, 1)) return FALSE; if(!PATH_AddEntry(pPath, &pt, PT_MOVETO)) return FALSE; } for(i = 0; i < cbPoints; i++) { pt = pts[i]; if(!LPtoDP(hdc, &pt, 1)) return FALSE; PATH_AddEntry(pPath, &pt, PT_BEZIERTO); } return TRUE; } /*********************************************************************** * Internal functions */ /* PATH_PathToRegion * * Creates a region from the specified path using the specified polygon * filling mode. The path is left unchanged. A handle to the region that * was created is stored in *pHrgn. If successful, TRUE is returned; if an * error occurs, SetLastError is called with the appropriate value and * FALSE is returned. */ static BOOL PATH_PathToRegion(const GdiPath *pPath, INT nPolyFillMode, HRGN *pHrgn) { int numStrokes, iStroke, i; INT *pNumPointsInStroke; HRGN hrgn; assert(pPath!=NULL); assert(pHrgn!=NULL); /* FIXME: What happens when number of points is zero? */ /* First pass: Find out how many strokes there are in the path */ /* FIXME: We could eliminate this with some bookkeeping in GdiPath */ numStrokes=0; for(i=0; inumEntriesUsed; i++) if((pPath->pFlags[i] & ~PT_CLOSEFIGURE) == PT_MOVETO) numStrokes++; /* Allocate memory for number-of-points-in-stroke array */ pNumPointsInStroke=(int *)HeapAlloc( GetProcessHeap(), 0, sizeof(int) * numStrokes ); if(!pNumPointsInStroke) { SetLastError(ERROR_NOT_ENOUGH_MEMORY); return FALSE; } /* Second pass: remember number of points in each polygon */ iStroke=-1; /* Will get incremented to 0 at beginning of first stroke */ for(i=0; inumEntriesUsed; i++) { /* Is this the beginning of a new stroke? */ if((pPath->pFlags[i] & ~PT_CLOSEFIGURE) == PT_MOVETO) { iStroke++; pNumPointsInStroke[iStroke]=0; } pNumPointsInStroke[iStroke]++; } /* Create a region from the strokes */ hrgn=CreatePolyPolygonRgn(pPath->pPoints, pNumPointsInStroke, numStrokes, nPolyFillMode); if(hrgn==(HRGN)0) { SetLastError(ERROR_NOT_ENOUGH_MEMORY); return FALSE; } /* Free memory for number-of-points-in-stroke array */ HeapFree( GetProcessHeap(), 0, pNumPointsInStroke ); /* Success! */ *pHrgn=hrgn; return TRUE; } /* PATH_EmptyPath * * Removes all entries from the path and sets the path state to PATH_Null. */ static void PATH_EmptyPath(GdiPath *pPath) { assert(pPath!=NULL); pPath->state=PATH_Null; pPath->numEntriesUsed=0; } /* PATH_AddEntry * * Adds an entry to the path. For "flags", pass either PT_MOVETO, PT_LINETO * or PT_BEZIERTO, optionally ORed with PT_CLOSEFIGURE. Returns TRUE if * successful, FALSE otherwise (e.g. if not enough memory was available). */ BOOL PATH_AddEntry(GdiPath *pPath, const POINT *pPoint, BYTE flags) { assert(pPath!=NULL); /* FIXME: If newStroke is true, perhaps we want to check that we're * getting a PT_MOVETO */ /* Check that path is open */ if(pPath->state!=PATH_Open) return FALSE; /* Reserve enough memory for an extra path entry */ if(!PATH_ReserveEntries(pPath, pPath->numEntriesUsed+1)) return FALSE; /* Store information in path entry */ pPath->pPoints[pPath->numEntriesUsed]=*pPoint; pPath->pFlags[pPath->numEntriesUsed]=flags; /* If this is PT_CLOSEFIGURE, we have to start a new stroke next time */ if((flags & PT_CLOSEFIGURE) == PT_CLOSEFIGURE) pPath->newStroke=TRUE; /* Increment entry count */ pPath->numEntriesUsed++; return TRUE; } /* PATH_ReserveEntries * * Ensures that at least "numEntries" entries (for points and flags) have * been allocated; allocates larger arrays and copies the existing entries * to those arrays, if necessary. Returns TRUE if successful, else FALSE. */ static BOOL PATH_ReserveEntries(GdiPath *pPath, INT numEntries) { INT numEntriesToAllocate; POINT *pPointsNew; BYTE *pFlagsNew; assert(pPath!=NULL); assert(numEntries>=0); /* Do we have to allocate more memory? */ if(numEntries > pPath->numEntriesAllocated) { /* Find number of entries to allocate. We let the size of the array * grow exponentially, since that will guarantee linear time * complexity. */ if(pPath->numEntriesAllocated) { numEntriesToAllocate=pPath->numEntriesAllocated; while(numEntriesToAllocatepPoints) { assert(pPath->pFlags); memcpy(pPointsNew, pPath->pPoints, sizeof(POINT)*pPath->numEntriesUsed); memcpy(pFlagsNew, pPath->pFlags, sizeof(BYTE)*pPath->numEntriesUsed); HeapFree( GetProcessHeap(), 0, pPath->pPoints ); HeapFree( GetProcessHeap(), 0, pPath->pFlags ); } pPath->pPoints=pPointsNew; pPath->pFlags=pFlagsNew; pPath->numEntriesAllocated=numEntriesToAllocate; } return TRUE; } /* PATH_GetPathFromHDC * * Retrieves a pointer to the GdiPath structure contained in an HDC and * places it in *ppPath. TRUE is returned if successful, FALSE otherwise. */ static BOOL PATH_GetPathFromHDC(HDC hdc, GdiPath **ppPath) { DC *pDC; pDC=DC_GetDCPtr(hdc); if(pDC) { *ppPath=&pDC->w.path; return TRUE; } else return FALSE; } /* PATH_DoArcPart * * Creates a Bezier spline that corresponds to part of an arc and appends the * corresponding points to the path. The start and end angles are passed in * "angleStart" and "angleEnd"; these angles should span a quarter circle * at most. If "addMoveTo" is true, a PT_MOVETO entry for the first control * point is added to the path; otherwise, it is assumed that the current * position is equal to the first control point. */ static BOOL PATH_DoArcPart(GdiPath *pPath, FLOAT_POINT corners[], double angleStart, double angleEnd, BOOL addMoveTo) { double halfAngle, a; double xNorm[4], yNorm[4]; POINT point; int i; assert(fabs(angleEnd-angleStart)<=M_PI_2); /* FIXME: Is there an easier way of computing this? */ /* Compute control points */ halfAngle=(angleEnd-angleStart)/2.0; if(fabs(halfAngle)>1e-8) { a=4.0/3.0*(1-cos(halfAngle))/sin(halfAngle); xNorm[0]=cos(angleStart); yNorm[0]=sin(angleStart); xNorm[1]=xNorm[0] - a*yNorm[0]; yNorm[1]=yNorm[0] + a*xNorm[0]; xNorm[3]=cos(angleEnd); yNorm[3]=sin(angleEnd); xNorm[2]=xNorm[3] + a*yNorm[3]; yNorm[2]=yNorm[3] - a*xNorm[3]; } else for(i=0; i<4; i++) { xNorm[i]=cos(angleStart); yNorm[i]=sin(angleStart); } /* Add starting point to path if desired */ if(addMoveTo) { PATH_ScaleNormalizedPoint(corners, xNorm[0], yNorm[0], &point); if(!PATH_AddEntry(pPath, &point, PT_MOVETO)) return FALSE; } /* Add remaining control points */ for(i=1; i<4; i++) { PATH_ScaleNormalizedPoint(corners, xNorm[i], yNorm[i], &point); if(!PATH_AddEntry(pPath, &point, PT_BEZIERTO)) return FALSE; } return TRUE; } /* PATH_ScaleNormalizedPoint * * Scales a normalized point (x, y) with respect to the box whose corners are * passed in "corners". The point is stored in "*pPoint". The normalized * coordinates (-1.0, -1.0) correspond to corners[0], the coordinates * (1.0, 1.0) correspond to corners[1]. */ static void PATH_ScaleNormalizedPoint(FLOAT_POINT corners[], double x, double y, POINT *pPoint) { pPoint->x=GDI_ROUND( (double)corners[0].x + (double)(corners[1].x-corners[0].x)*0.5*(x+1.0) ); pPoint->y=GDI_ROUND( (double)corners[0].y + (double)(corners[1].y-corners[0].y)*0.5*(y+1.0) ); } /* PATH_NormalizePoint * * Normalizes a point with respect to the box whose corners are passed in * "corners". The normalized coordinates are stored in "*pX" and "*pY". */ static void PATH_NormalizePoint(FLOAT_POINT corners[], const FLOAT_POINT *pPoint, double *pX, double *pY) { *pX=(double)(pPoint->x-corners[0].x)/(double)(corners[1].x-corners[0].x) * 2.0 - 1.0; *pY=(double)(pPoint->y-corners[0].y)/(double)(corners[1].y-corners[0].y) * 2.0 - 1.0; } /******************************************************************* * FlattenPath16 [GDI.516] * * */ BOOL16 WINAPI FlattenPath16(HDC16 hdc) { return (BOOL16) FlattenPath((HDC) hdc); } /******************************************************************* * FlattenPath [GDI32.103] * * */ BOOL WINAPI FlattenPath(HDC hdc) { DC *dc = DC_GetDCPtr( hdc ); if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pFlattenPath) return dc->funcs->pFlattenPath(dc); FIXME("stub\n"); return 0; } /******************************************************************* * StrokeAndFillPath16 [GDI.520] * * */ BOOL16 WINAPI StrokeAndFillPath16(HDC16 hdc) { return (BOOL16) StrokeAndFillPath((HDC) hdc); } /******************************************************************* * StrokeAndFillPath [GDI32.352] * * */ BOOL WINAPI StrokeAndFillPath(HDC hdc) { DC *dc = DC_GetDCPtr( hdc ); if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pStrokeAndFillPath) return dc->funcs->pStrokeAndFillPath(dc); FIXME("stub\n"); return StrokePath(hdc); } /******************************************************************* * StrokePath16 [GDI.521] * * */ BOOL16 WINAPI StrokePath16(HDC16 hdc) { return (BOOL16) StrokePath((HDC) hdc); } /******************************************************************* * StrokePath [GDI32.353] * * */ BOOL WINAPI StrokePath(HDC hdc) { DC *dc = DC_GetDCPtr( hdc ); GdiPath *pPath; INT i; POINT ptLastMove = {0,0}; TRACE("(%08x)\n", hdc); if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pStrokePath) return dc->funcs->pStrokePath(dc); pPath = &dc->w.path; if(pPath->state != PATH_Closed) return FALSE; SaveDC(hdc); SetMapMode(hdc, MM_TEXT); SetViewportOrgEx(hdc, 0, 0, NULL); SetWindowOrgEx(hdc, 0, 0, NULL); for(i = 0; i < pPath->numEntriesUsed; i++) { switch(pPath->pFlags[i]) { case PT_MOVETO: TRACE("Got PT_MOVETO (%ld, %ld)\n", pPath->pPoints[i].x, pPath->pPoints[i].y); MoveToEx(hdc, pPath->pPoints[i].x, pPath->pPoints[i].y, NULL); ptLastMove = pPath->pPoints[i]; break; case PT_LINETO: case (PT_LINETO | PT_CLOSEFIGURE): TRACE("Got PT_LINETO (%ld, %ld)\n", pPath->pPoints[i].x, pPath->pPoints[i].y); LineTo(hdc, pPath->pPoints[i].x, pPath->pPoints[i].y); break; case PT_BEZIERTO: TRACE("Got PT_BEZIERTO\n"); if(pPath->pFlags[i+1] != PT_BEZIERTO || (pPath->pFlags[i+2] & ~PT_CLOSEFIGURE) != PT_BEZIERTO) { ERR("Path didn't contain 3 successive PT_BEZIERTOs\n"); return FALSE; } PolyBezierTo(hdc, &pPath->pPoints[i], 3); i += 2; break; default: ERR("Got path flag %d\n", (INT)pPath->pFlags[i]); return FALSE; } if(pPath->pFlags[i] & PT_CLOSEFIGURE) LineTo(hdc, ptLastMove.x, ptLastMove.y); } RestoreDC(hdc, -1); PATH_EmptyPath(pPath); return TRUE; } /******************************************************************* * WidenPath16 [GDI.522] * * */ BOOL16 WINAPI WidenPath16(HDC16 hdc) { return (BOOL16) WidenPath((HDC) hdc); } /******************************************************************* * WidenPath [GDI32.360] * * */ BOOL WINAPI WidenPath(HDC hdc) { DC *dc = DC_GetDCPtr( hdc ); if(!dc) { SetLastError(ERROR_INVALID_HANDLE); return FALSE; } if(dc->funcs->pWidenPath) return dc->funcs->pWidenPath(dc); FIXME("stub\n"); return 0; }