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wine/graphics/painting.c
Huw D M Davies b8e94b6119 Move Bezier code out of x11drv into commmon GDI code; if any driver 
does not implement PolyBezier[To] the curve is approximated to lines
and drawn with Polyline.
Implement many GDI-Path recording functions (at least the win9x subset).
Implement FlattenPath and FillPath.
1999-12-20 04:14:48 +00:00

1123 lines
31 KiB
C
Raw Blame History

/*
* GDI drawing functions.
*
* Copyright 1993, 1994 Alexandre Julliard
* Copyright 1997 Bertho A. Stultiens
* 1999 Huw D M Davies
*/
#include <string.h>
#include "dc.h"
#include "bitmap.h"
#include "heap.h"
#include "monitor.h"
#include "cache.h"
#include "region.h"
#include "path.h"
#include "debugtools.h"
#include "winerror.h"
#include "winuser.h"
#include "wine/winuser16.h"
DEFAULT_DEBUG_CHANNEL(gdi)
/***********************************************************************
* LineTo16 (GDI.19)
*/
BOOL16 WINAPI LineTo16( HDC16 hdc, INT16 x, INT16 y )
{
return LineTo( hdc, x, y );
}
/***********************************************************************
* LineTo (GDI32.249)
*/
BOOL WINAPI LineTo( HDC hdc, INT x, INT y )
{
DC * dc = DC_GetDCPtr( hdc );
BOOL ret;
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
ret = PATH_LineTo(hdc, x, y);
else
ret = dc->funcs->pLineTo && dc->funcs->pLineTo(dc,x,y);
if(ret) {
dc->w.CursPosX = x;
dc->w.CursPosY = y;
}
return ret;
}
/***********************************************************************
* MoveTo16 (GDI.20)
*/
DWORD WINAPI MoveTo16( HDC16 hdc, INT16 x, INT16 y )
{
POINT16 pt;
if (!MoveToEx16(hdc,x,y,&pt))
return 0;
return MAKELONG(pt.x,pt.y);
}
/***********************************************************************
* MoveToEx16 (GDI.483)
*/
BOOL16 WINAPI MoveToEx16( HDC16 hdc, INT16 x, INT16 y, LPPOINT16 pt )
{
POINT pt32;
if (!MoveToEx( (HDC)hdc, (INT)x, (INT)y, &pt32 )) return FALSE;
if (pt) CONV_POINT32TO16( &pt32, pt );
return TRUE;
}
/***********************************************************************
* MoveToEx (GDI32.254)
*/
BOOL WINAPI MoveToEx( HDC hdc, INT x, INT y, LPPOINT pt )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(pt) {
pt->x = dc->w.CursPosX;
pt->y = dc->w.CursPosY;
}
dc->w.CursPosX = x;
dc->w.CursPosY = y;
if(PATH_IsPathOpen(dc->w.path))
return PATH_MoveTo(hdc);
if(dc->funcs->pMoveToEx)
return dc->funcs->pMoveToEx(dc,x,y,pt);
return FALSE;
}
/***********************************************************************
* Arc16 (GDI.23)
*/
BOOL16 WINAPI Arc16( HDC16 hdc, INT16 left, INT16 top, INT16 right,
INT16 bottom, INT16 xstart, INT16 ystart,
INT16 xend, INT16 yend )
{
return Arc( (HDC)hdc, (INT)left, (INT)top, (INT)right,
(INT)bottom, (INT)xstart, (INT)ystart, (INT)xend,
(INT)yend );
}
/***********************************************************************
* Arc (GDI32.7)
*/
BOOL WINAPI Arc( HDC hdc, INT left, INT top, INT right,
INT bottom, INT xstart, INT ystart,
INT xend, INT yend )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
return PATH_Arc(hdc, left, top, right, bottom, xstart, ystart, xend,
yend);
return dc->funcs->pArc &&
dc->funcs->pArc(dc,left,top,right,bottom,xstart,ystart,xend,yend);
}
/***********************************************************************
* ArcTo (GDI32.8)
*/
BOOL WINAPI ArcTo( HDC hdc,
INT left, INT top,
INT right, INT bottom,
INT xstart, INT ystart,
INT xend, INT yend )
{
BOOL result;
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(dc->funcs->pArcTo)
return dc->funcs->pArcTo( dc, left, top, right, bottom,
xstart, ystart, xend, yend );
/*
* Else emulate it.
* According to the documentation, a line is drawn from the current
* position to the starting point of the arc.
*/
LineTo(hdc, xstart, ystart);
/*
* Then the arc is drawn.
*/
result = Arc(hdc,
left, top,
right, bottom,
xstart, ystart,
xend, yend);
/*
* If no error occured, the current position is moved to the ending
* point of the arc.
*/
if (result)
{
MoveToEx(hdc, xend, yend, NULL);
}
return result;
}
/***********************************************************************
* Pie16 (GDI.26)
*/
BOOL16 WINAPI Pie16( HDC16 hdc, INT16 left, INT16 top,
INT16 right, INT16 bottom, INT16 xstart, INT16 ystart,
INT16 xend, INT16 yend )
{
return Pie( (HDC)hdc, (INT)left, (INT)top, (INT)right,
(INT)bottom, (INT)xstart, (INT)ystart, (INT)xend,
(INT)yend );
}
/***********************************************************************
* Pie (GDI32.262)
*/
BOOL WINAPI Pie( HDC hdc, INT left, INT top,
INT right, INT bottom, INT xstart, INT ystart,
INT xend, INT yend )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path)) {
FIXME("-> Path: stub\n");
return FALSE;
}
return dc->funcs->pPie &&
dc->funcs->pPie(dc,left,top,right,bottom,xstart,ystart,xend,yend);
}
/***********************************************************************
* Chord16 (GDI.348)
*/
BOOL16 WINAPI Chord16( HDC16 hdc, INT16 left, INT16 top,
INT16 right, INT16 bottom, INT16 xstart, INT16 ystart,
INT16 xend, INT16 yend )
{
return Chord( hdc, left, top, right, bottom, xstart, ystart, xend, yend );
}
/***********************************************************************
* Chord (GDI32.14)
*/
BOOL WINAPI Chord( HDC hdc, INT left, INT top,
INT right, INT bottom, INT xstart, INT ystart,
INT xend, INT yend )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path)) {
FIXME("-> Path: stub\n");
return FALSE;
}
return dc->funcs->pChord &&
dc->funcs->pChord(dc,left,top,right,bottom,xstart,ystart,xend,yend);
}
/***********************************************************************
* Ellipse16 (GDI.24)
*/
BOOL16 WINAPI Ellipse16( HDC16 hdc, INT16 left, INT16 top,
INT16 right, INT16 bottom )
{
return Ellipse( hdc, left, top, right, bottom );
}
/***********************************************************************
* Ellipse (GDI32.75)
*/
BOOL WINAPI Ellipse( HDC hdc, INT left, INT top,
INT right, INT bottom )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path)) {
FIXME("-> Path: stub\n");
return FALSE;
}
return dc->funcs->pEllipse &&
dc->funcs->pEllipse(dc,left,top,right,bottom);
}
/***********************************************************************
* Rectangle16 (GDI.27)
*/
BOOL16 WINAPI Rectangle16( HDC16 hdc, INT16 left, INT16 top,
INT16 right, INT16 bottom )
{
return Rectangle( hdc, left, top, right, bottom );
}
/***********************************************************************
* Rectangle (GDI32.283)
*/
BOOL WINAPI Rectangle( HDC hdc, INT left, INT top,
INT right, INT bottom )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
return PATH_Rectangle(hdc, left, top, right, bottom);
return dc->funcs->pRectangle &&
dc->funcs->pRectangle(dc,left,top,right,bottom);
}
/***********************************************************************
* RoundRect16 (GDI.28)
*/
BOOL16 WINAPI RoundRect16( HDC16 hdc, INT16 left, INT16 top, INT16 right,
INT16 bottom, INT16 ell_width, INT16 ell_height )
{
return RoundRect( hdc, left, top, right, bottom, ell_width, ell_height );
}
/***********************************************************************
* RoundRect (GDI32.291)
*/
BOOL WINAPI RoundRect( HDC hdc, INT left, INT top, INT right,
INT bottom, INT ell_width, INT ell_height )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path)) {
FIXME("-> Path: stub\n");
return FALSE;
}
return dc->funcs->pRoundRect &&
dc->funcs->pRoundRect(dc,left,top,right,bottom,ell_width,ell_height);
}
/***********************************************************************
* SetPixel16 (GDI.31)
*/
COLORREF WINAPI SetPixel16( HDC16 hdc, INT16 x, INT16 y, COLORREF color )
{
return SetPixel( hdc, x, y, color );
}
/***********************************************************************
* SetPixel (GDI32.327)
*/
COLORREF WINAPI SetPixel( HDC hdc, INT x, INT y, COLORREF color )
{
DC * dc = DC_GetDCPtr( hdc );
if (!dc || !dc->funcs->pSetPixel) return 0;
return dc->funcs->pSetPixel(dc,x,y,color);
}
/***********************************************************************
* SetPixelV (GDI32.329)
*/
BOOL WINAPI SetPixelV( HDC hdc, INT x, INT y, COLORREF color )
{
DC * dc = DC_GetDCPtr( hdc );
if (!dc || !dc->funcs->pSetPixel) return FALSE;
dc->funcs->pSetPixel(dc,x,y,color);
return TRUE;
}
/***********************************************************************
* GetPixel16 (GDI.83)
*/
COLORREF WINAPI GetPixel16( HDC16 hdc, INT16 x, INT16 y )
{
return GetPixel( hdc, x, y );
}
/***********************************************************************
* GetPixel (GDI32.211)
*/
COLORREF WINAPI GetPixel( HDC hdc, INT x, INT y )
{
DC * dc = DC_GetDCPtr( hdc );
if (!dc) return 0;
#ifdef SOLITAIRE_SPEED_HACK
return 0;
#endif
/* FIXME: should this be in the graphics driver? */
if (!PtVisible( hdc, x, y )) return 0;
if (!dc || !dc->funcs->pGetPixel) return 0;
return dc->funcs->pGetPixel(dc,x,y);
}
/******************************************************************************
* ChoosePixelFormat [GDI32.13]
* Matches a pixel format to given format
*
* PARAMS
* hdc [I] Device context to search for best pixel match
* ppfd [I] Pixel format for which a match is sought
*
* RETURNS
* Success: Pixel format index closest to given format
* Failure: 0
*/
INT WINAPI ChoosePixelFormat( HDC hdc, const PIXELFORMATDESCRIPTOR* ppfd )
{
FIXME("(%d,%p): stub\n",hdc,ppfd);
return 1;
}
/******************************************************************************
* SetPixelFormat [GDI32.328]
* Sets pixel format of device context
*
* PARAMS
* hdc [I] Device context to search for best pixel match
* iPixelFormat [I] Pixel format index
* ppfd [I] Pixel format for which a match is sought
*
* RETURNS STD
*/
BOOL WINAPI SetPixelFormat( HDC hdc, int iPixelFormat,
const PIXELFORMATDESCRIPTOR* ppfd)
{
FIXME("(%d,%d,%p): stub\n",hdc,iPixelFormat,ppfd);
return TRUE;
}
/******************************************************************************
* GetPixelFormat [GDI32.212]
* Gets index of pixel format of DC
*
* PARAMETERS
* hdc [I] Device context whose pixel format index is sought
*
* RETURNS
* Success: Currently selected pixel format
* Failure: 0
*/
int WINAPI GetPixelFormat( HDC hdc )
{
FIXME("(%d): stub\n",hdc);
return 1;
}
/******************************************************************************
* DescribePixelFormat [GDI32.71]
* Gets info about pixel format from DC
*
* PARAMS
* hdc [I] Device context
* iPixelFormat [I] Pixel format selector
* nBytes [I] Size of buffer
* ppfd [O] Pointer to structure to receive pixel format data
*
* RETURNS
* Success: Maximum pixel format index of the device context
* Failure: 0
*/
int WINAPI DescribePixelFormat( HDC hdc, int iPixelFormat, UINT nBytes,
LPPIXELFORMATDESCRIPTOR ppfd )
{
FIXME("(%d,%d,%d,%p): stub\n",hdc,iPixelFormat,nBytes,ppfd);
ppfd->nSize = nBytes;
ppfd->nVersion = 1;
return 3;
}
/******************************************************************************
* SwapBuffers [GDI32.354]
* Exchanges front and back buffers of window
*
* PARAMS
* hdc [I] Device context whose buffers get swapped
*
* RETURNS STD
*/
BOOL WINAPI SwapBuffers( HDC hdc )
{
FIXME("(%d): stub\n",hdc);
return TRUE;
}
/***********************************************************************
* PaintRgn16 (GDI.43)
*/
BOOL16 WINAPI PaintRgn16( HDC16 hdc, HRGN16 hrgn )
{
return PaintRgn( hdc, hrgn );
}
/***********************************************************************
* PaintRgn (GDI32.259)
*/
BOOL WINAPI PaintRgn( HDC hdc, HRGN hrgn )
{
DC * dc = DC_GetDCPtr( hdc );
return dc && dc->funcs->pPaintRgn &&
dc->funcs->pPaintRgn(dc,hrgn);
}
/***********************************************************************
* FillRgn16 (GDI.40)
*/
BOOL16 WINAPI FillRgn16( HDC16 hdc, HRGN16 hrgn, HBRUSH16 hbrush )
{
return FillRgn( hdc, hrgn, hbrush );
}
/***********************************************************************
* FillRgn (GDI32.101)
*/
BOOL WINAPI FillRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush )
{
BOOL retval;
HBRUSH prevBrush;
DC * dc = DC_GetDCPtr( hdc );
if (!dc) return FALSE;
if(dc->funcs->pFillRgn)
return dc->funcs->pFillRgn(dc, hrgn, hbrush);
prevBrush = SelectObject( hdc, hbrush );
if (!prevBrush) return FALSE;
retval = PaintRgn( hdc, hrgn );
SelectObject( hdc, prevBrush );
return retval;
}
/***********************************************************************
* FrameRgn16 (GDI.41)
*/
BOOL16 WINAPI FrameRgn16( HDC16 hdc, HRGN16 hrgn, HBRUSH16 hbrush,
INT16 nWidth, INT16 nHeight )
{
return FrameRgn( hdc, hrgn, hbrush, nWidth, nHeight );
}
/***********************************************************************
* FrameRgn (GDI32.105)
*/
BOOL WINAPI FrameRgn( HDC hdc, HRGN hrgn, HBRUSH hbrush,
INT nWidth, INT nHeight )
{
HRGN tmp;
DC *dc = DC_GetDCPtr( hdc );
if(dc->funcs->pFrameRgn)
return dc->funcs->pFrameRgn( dc, hrgn, hbrush, nWidth, nHeight );
tmp = CreateRectRgn( 0, 0, 0, 0 );
if(!REGION_FrameRgn( tmp, hrgn, nWidth, nHeight )) return FALSE;
FillRgn( hdc, tmp, hbrush );
DeleteObject( tmp );
return TRUE;
}
/***********************************************************************
* InvertRgn16 (GDI.42)
*/
BOOL16 WINAPI InvertRgn16( HDC16 hdc, HRGN16 hrgn )
{
return InvertRgn( hdc, hrgn );
}
/***********************************************************************
* InvertRgn (GDI32.246)
*/
BOOL WINAPI InvertRgn( HDC hdc, HRGN hrgn )
{
HBRUSH prevBrush;
INT prevROP;
BOOL retval;
DC *dc = DC_GetDCPtr( hdc );
if(dc->funcs->pInvertRgn)
return dc->funcs->pInvertRgn( dc, hrgn );
prevBrush = SelectObject( hdc, GetStockObject(BLACK_BRUSH) );
prevROP = SetROP2( hdc, R2_NOT );
retval = PaintRgn( hdc, hrgn );
SelectObject( hdc, prevBrush );
SetROP2( hdc, prevROP );
return retval;
}
/**********************************************************************
* Polyline16 (GDI.37)
*/
BOOL16 WINAPI Polyline16( HDC16 hdc, const POINT16* pt, INT16 count )
{
register int i;
BOOL16 ret;
LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
count*sizeof(POINT) );
if (!pt32) return FALSE;
for (i=count;i--;) CONV_POINT16TO32(&(pt[i]),&(pt32[i]));
ret = Polyline(hdc,pt32,count);
HeapFree( GetProcessHeap(), 0, pt32 );
return ret;
}
/**********************************************************************
* Polyline (GDI32.276)
*/
BOOL WINAPI Polyline( HDC hdc, const POINT* pt, INT count )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
return PATH_Polyline(hdc, pt, count);
return dc->funcs->pPolyline &&
dc->funcs->pPolyline(dc,pt,count);
}
/**********************************************************************
* PolylineTo (GDI32.277)
*/
BOOL WINAPI PolylineTo( HDC hdc, const POINT* pt, DWORD cCount )
{
DC * dc = DC_GetDCPtr( hdc );
BOOL ret;
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
ret = PATH_PolylineTo(hdc, pt, cCount);
else if(dc->funcs->pPolylineTo)
ret = dc->funcs->pPolylineTo(dc, pt, cCount);
else { /* do it using Polyline */
POINT *pts = HeapAlloc( GetProcessHeap(), 0,
sizeof(POINT) * (cCount + 1) );
if(!pts) return FALSE;
pts[0].x = dc->w.CursPosX;
pts[0].y = dc->w.CursPosY;
memcpy( pts + 1, pt, sizeof(POINT) * cCount );
ret = Polyline( hdc, pts, cCount + 1 );
HeapFree( GetProcessHeap(), 0, pts );
}
if(ret) {
dc->w.CursPosX = pt[cCount-1].x;
dc->w.CursPosY = pt[cCount-1].y;
}
return ret;
}
/**********************************************************************
* Polygon16 (GDI.36)
*/
BOOL16 WINAPI Polygon16( HDC16 hdc, const POINT16* pt, INT16 count )
{
register int i;
BOOL ret;
LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
count*sizeof(POINT) );
if (!pt32) return FALSE;
for (i=count;i--;) CONV_POINT16TO32(&(pt[i]),&(pt32[i]));
ret = Polygon(hdc,pt32,count);
HeapFree( GetProcessHeap(), 0, pt32 );
return ret;
}
/**********************************************************************
* Polygon (GDI32.275)
*/
BOOL WINAPI Polygon( HDC hdc, const POINT* pt, INT count )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
return PATH_Polygon(hdc, pt, count);
return dc->funcs->pPolygon &&
dc->funcs->pPolygon(dc,pt,count);
}
/**********************************************************************
* PolyPolygon16 (GDI.450)
*/
BOOL16 WINAPI PolyPolygon16( HDC16 hdc, const POINT16* pt, const INT16* counts,
UINT16 polygons )
{
int i,nrpts;
LPPOINT pt32;
LPINT counts32;
BOOL16 ret;
nrpts=0;
for (i=polygons;i--;)
nrpts+=counts[i];
pt32 = (LPPOINT)HEAP_xalloc( GetProcessHeap(), 0, sizeof(POINT)*nrpts);
for (i=nrpts;i--;)
CONV_POINT16TO32(&(pt[i]),&(pt32[i]));
counts32 = (LPINT)HEAP_xalloc( GetProcessHeap(), 0,
polygons*sizeof(INT) );
for (i=polygons;i--;) counts32[i]=counts[i];
ret = PolyPolygon(hdc,pt32,counts32,polygons);
HeapFree( GetProcessHeap(), 0, counts32 );
HeapFree( GetProcessHeap(), 0, pt32 );
return ret;
}
/**********************************************************************
* PolyPolygon (GDI.450)
*/
BOOL WINAPI PolyPolygon( HDC hdc, const POINT* pt, const INT* counts,
UINT polygons )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
return PATH_PolyPolygon(hdc, pt, counts, polygons);
return dc->funcs->pPolyPolygon &&
dc->funcs->pPolyPolygon(dc,pt,counts,polygons);
}
/**********************************************************************
* PolyPolyline (GDI32.272)
*/
BOOL WINAPI PolyPolyline( HDC hdc, const POINT* pt, const DWORD* counts,
DWORD polylines )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
return PATH_PolyPolyline(hdc, pt, counts, polylines);
return dc->funcs->pPolyPolyline &&
dc->funcs->pPolyPolyline(dc,pt,counts,polylines);
}
/**********************************************************************
* ExtFloodFill16 (GDI.372)
*/
BOOL16 WINAPI ExtFloodFill16( HDC16 hdc, INT16 x, INT16 y, COLORREF color,
UINT16 fillType )
{
return ExtFloodFill( hdc, x, y, color, fillType );
}
/**********************************************************************
* ExtFloodFill (GDI32.96)
*/
BOOL WINAPI ExtFloodFill( HDC hdc, INT x, INT y, COLORREF color,
UINT fillType )
{
DC *dc = DC_GetDCPtr( hdc );
return dc && dc->funcs->pExtFloodFill &&
dc->funcs->pExtFloodFill(dc,x,y,color,fillType);
}
/**********************************************************************
* FloodFill16 (GDI.25)
*/
BOOL16 WINAPI FloodFill16( HDC16 hdc, INT16 x, INT16 y, COLORREF color )
{
return ExtFloodFill( hdc, x, y, color, FLOODFILLBORDER );
}
/**********************************************************************
* FloodFill (GDI32.104)
*/
BOOL WINAPI FloodFill( HDC hdc, INT x, INT y, COLORREF color )
{
return ExtFloodFill( hdc, x, y, color, FLOODFILLBORDER );
}
/******************************************************************************
* PolyBezier16 [GDI.502]
*/
BOOL16 WINAPI PolyBezier16( HDC16 hDc, const POINT16* lppt, INT16 cPoints )
{
int i;
BOOL16 ret;
LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
cPoints*sizeof(POINT) );
if(!pt32) return FALSE;
for (i=cPoints;i--;) CONV_POINT16TO32(&(lppt[i]),&(pt32[i]));
ret= PolyBezier(hDc, pt32, cPoints);
HeapFree( GetProcessHeap(), 0, pt32 );
return ret;
}
/******************************************************************************
* PolyBezierTo16 [GDI.503]
*/
BOOL16 WINAPI PolyBezierTo16( HDC16 hDc, const POINT16* lppt, INT16 cPoints )
{
int i;
BOOL16 ret;
LPPOINT pt32 = (LPPOINT)HeapAlloc( GetProcessHeap(), 0,
cPoints*sizeof(POINT) );
if(!pt32) return FALSE;
for (i=cPoints;i--;) CONV_POINT16TO32(&(lppt[i]),&(pt32[i]));
ret= PolyBezierTo(hDc, pt32, cPoints);
HeapFree( GetProcessHeap(), 0, pt32 );
return ret;
}
/******************************************************************************
* PolyBezier [GDI32.268]
* Draws one or more Bezier curves
*
* PARAMS
* hDc [I] Handle to device context
* lppt [I] Pointer to endpoints and control points
* cPoints [I] Count of endpoints and control points
*
* RETURNS STD
*/
BOOL WINAPI PolyBezier( HDC hdc, const POINT* lppt, DWORD cPoints )
{
DC * dc = DC_GetDCPtr( hdc );
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
return PATH_PolyBezier(hdc, lppt, cPoints);
if(dc->funcs->pPolyBezier)
return dc->funcs->pPolyBezier(dc, lppt, cPoints);
/* We'll convert it into line segments and draw them using Polyline */
{
POINT *Pts;
INT nOut;
BOOL ret;
Pts = GDI_Bezier( lppt, cPoints, &nOut );
if(!Pts) return FALSE;
TRACE("Pts = %p, no = %d\n", Pts, nOut);
ret = Polyline( dc->hSelf, Pts, nOut );
HeapFree( GetProcessHeap(), 0, Pts );
return ret;
}
}
/******************************************************************************
* PolyBezierTo [GDI32.269]
* Draws one or more Bezier curves
*
* PARAMS
* hDc [I] Handle to device context
* lppt [I] Pointer to endpoints and control points
* cPoints [I] Count of endpoints and control points
*
* RETURNS STD
*/
BOOL WINAPI PolyBezierTo( HDC hdc, const POINT* lppt, DWORD cPoints )
{
DC * dc = DC_GetDCPtr( hdc );
BOOL ret;
if(!dc) return FALSE;
if(PATH_IsPathOpen(dc->w.path))
ret = PATH_PolyBezierTo(hdc, lppt, cPoints);
else if(dc->funcs->pPolyBezierTo)
ret = dc->funcs->pPolyBezierTo(dc, lppt, cPoints);
else { /* We'll do it using PolyBezier */
POINT *pt;
pt = HeapAlloc( GetProcessHeap(), 0, sizeof(POINT) * (cPoints + 1) );
if(!pt) return FALSE;
pt[0].x = dc->w.CursPosX;
pt[0].y = dc->w.CursPosY;
memcpy(pt + 1, lppt, sizeof(POINT) * cPoints);
ret = PolyBezier(dc->hSelf, pt, cPoints+1);
HeapFree( GetProcessHeap(), 0, pt );
}
if(ret) {
dc->w.CursPosX = lppt[cPoints-1].x;
dc->w.CursPosY = lppt[cPoints-1].y;
}
return ret;
}
/***************************************************************
* AngleArc (GDI32.5)
*
*/
BOOL WINAPI AngleArc(HDC hdc, INT x, INT y, DWORD dwRadius,
FLOAT eStartAngle, FLOAT eSweepAngle)
{
FIXME("AngleArc, stub\n");
return 0;
}
/***************************************************************
* PolyDraw (GDI32.270)
*
*/
BOOL WINAPI PolyDraw(HDC hdc, const POINT *lppt, const BYTE *lpbTypes,
DWORD cCount)
{
FIXME("PolyDraw, stub\n");
return 0;
}
/******************************************************************
*
* *Very* simple bezier drawing code,
*
* It uses a recursive algorithm to divide the curve in a series
* of straight line segements. Not ideal but for me sufficient.
* If you are in need for something better look for some incremental
* algorithm.
*
* 7 July 1998 Rein Klazes
*/
/*
* some macro definitions for bezier drawing
*
* to avoid trucation errors the coordinates are
* shifted upwards. When used in drawing they are
* shifted down again, including correct rounding
* and avoiding floating point arithmatic
* 4 bits should allow 27 bits coordinates which I saw
* somewere in the win32 doc's
*
*/
#define BEZIERSHIFTBITS 4
#define BEZIERSHIFTUP(x) ((x)<<BEZIERSHIFTBITS)
#define BEZIERPIXEL BEZIERSHIFTUP(1)
#define BEZIERSHIFTDOWN(x) (((x)+(1<<(BEZIERSHIFTBITS-1)))>>BEZIERSHIFTBITS)
/* maximum depth of recursion */
#define BEZIERMAXDEPTH 8
/* size of array to store points on */
/* enough for one curve */
#define BEZIER_INITBUFSIZE (150)
/* calculate Bezier average, in this case the middle
* correctly rounded...
* */
#define BEZIERMIDDLE(Mid, P1, P2) \
(Mid).x=((P1).x+(P2).x + 1)/2;\
(Mid).y=((P1).y+(P2).y + 1)/2;
/**********************************************************
* BezierCheck helper function to check
* that recursion can be terminated
* Points[0] and Points[3] are begin and endpoint
* Points[1] and Points[2] are control points
* level is the recursion depth
* returns true if the recusion can be terminated
*/
static BOOL BezierCheck( int level, POINT *Points)
{
INT dx, dy;
dx=Points[3].x-Points[0].x;
dy=Points[3].y-Points[0].y;
if(abs(dy)<=abs(dx)){/* shallow line */
/* check that control points are between begin and end */
if(Points[1].x < Points[0].x){
if(Points[1].x < Points[3].x)
return FALSE;
}else
if(Points[1].x > Points[3].x)
return FALSE;
if(Points[2].x < Points[0].x){
if(Points[2].x < Points[3].x)
return FALSE;
}else
if(Points[2].x > Points[3].x)
return FALSE;
dx=BEZIERSHIFTDOWN(dx);
if(!dx) return TRUE;
if(abs(Points[1].y-Points[0].y-(dy/dx)*
BEZIERSHIFTDOWN(Points[1].x-Points[0].x)) > BEZIERPIXEL ||
abs(Points[2].y-Points[0].y-(dy/dx)*
BEZIERSHIFTDOWN(Points[2].x-Points[0].x)) > BEZIERPIXEL )
return FALSE;
else
return TRUE;
}else{ /* steep line */
/* check that control points are between begin and end */
if(Points[1].y < Points[0].y){
if(Points[1].y < Points[3].y)
return FALSE;
}else
if(Points[1].y > Points[3].y)
return FALSE;
if(Points[2].y < Points[0].y){
if(Points[2].y < Points[3].y)
return FALSE;
}else
if(Points[2].y > Points[3].y)
return FALSE;
dy=BEZIERSHIFTDOWN(dy);
if(!dy) return TRUE;
if(abs(Points[1].x-Points[0].x-(dx/dy)*
BEZIERSHIFTDOWN(Points[1].y-Points[0].y)) > BEZIERPIXEL ||
abs(Points[2].x-Points[0].x-(dx/dy)*
BEZIERSHIFTDOWN(Points[2].y-Points[0].y)) > BEZIERPIXEL )
return FALSE;
else
return TRUE;
}
}
/* Helper for GDI_Bezier.
* Just handles one Bezier, so Points should point to four POINTs
*/
static void GDI_InternalBezier( POINT *Points, POINT **PtsOut, INT *dwOut,
INT *nPtsOut, INT level )
{
if(*nPtsOut == *dwOut) {
*dwOut *= 2;
*PtsOut = HeapReAlloc( GetProcessHeap(), 0, *PtsOut,
*dwOut * sizeof(POINT) );
}
if(!level || BezierCheck(level, Points)) {
if(*nPtsOut == 0) {
(*PtsOut)[0].x = BEZIERSHIFTDOWN(Points[0].x);
(*PtsOut)[0].y = BEZIERSHIFTDOWN(Points[0].y);
*nPtsOut = 1;
}
(*PtsOut)[*nPtsOut].x = BEZIERSHIFTDOWN(Points[3].x);
(*PtsOut)[*nPtsOut].y = BEZIERSHIFTDOWN(Points[3].y);
(*nPtsOut) ++;
} else {
POINT Points2[4]; /* for the second recursive call */
Points2[3]=Points[3];
BEZIERMIDDLE(Points2[2], Points[2], Points[3]);
BEZIERMIDDLE(Points2[0], Points[1], Points[2]);
BEZIERMIDDLE(Points2[1],Points2[0],Points2[2]);
BEZIERMIDDLE(Points[1], Points[0], Points[1]);
BEZIERMIDDLE(Points[2], Points[1], Points2[0]);
BEZIERMIDDLE(Points[3], Points[2], Points2[1]);
Points2[0]=Points[3];
/* do the two halves */
GDI_InternalBezier(Points, PtsOut, dwOut, nPtsOut, level-1);
GDI_InternalBezier(Points2, PtsOut, dwOut, nPtsOut, level-1);
}
}
/***********************************************************************
* GDI_Bezier [INTERNAL]
* Calculate line segments that approximate -what microsoft calls- a bezier
* curve.
* The routine recursively divides the curve in two parts until a straight
* line can be drawn
*
* PARAMS
*
* Points [I] Ptr to count POINTs which are the end and control points
* of the set of Bezier curves to flatten.
* count [I] Number of Points. Must be 3n+1.
* nPtsOut [O] Will contain no of points that have been produced (i.e. no. of
* lines+1).
*
* RETURNS
*
* Ptr to an array of POINTs that contain the lines that approximinate the
* Beziers. The array is allocated on the process heap and it is the caller's
* responsibility to HeapFree it. [this is not a particularly nice interface
* but since we can't know in advance how many points will generate, the
* alternative would be to call the function twice, once to determine the size
* and a second time to do the work - I decided this was too much of a pain].
*/
POINT *GDI_Bezier( const POINT *Points, INT count, INT *nPtsOut )
{
POINT *out;
INT Bezier, dwOut = BEZIER_INITBUFSIZE, i;
if((count - 1) % 3 != 0) {
ERR("Invalid no. of points\n");
return NULL;
}
*nPtsOut = 0;
out = HeapAlloc( GetProcessHeap(), 0, dwOut * sizeof(POINT));
for(Bezier = 0; Bezier < (count-1)/3; Bezier++) {
POINT ptBuf[4];
memcpy(ptBuf, Points + Bezier * 3, sizeof(POINT) * 4);
for(i = 0; i < 4; i++) {
ptBuf[i].x = BEZIERSHIFTUP(ptBuf[i].x);
ptBuf[i].y = BEZIERSHIFTUP(ptBuf[i].y);
}
GDI_InternalBezier( ptBuf, &out, &dwOut, nPtsOut, BEZIERMAXDEPTH );
}
TRACE("Produced %d points\n", *nPtsOut);
return out;
}
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