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Sweden-Number/objects/clipping.c

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/*
* DC clipping functions
*
* Copyright 1993 Alexandre Julliard
*/
static char Copyright[] = "Copyright Alexandre Julliard, 1993";
#include <stdio.h>
#include "gdi.h"
#include "metafile.h"
#include "stddebug.h"
/* #define DEBUG_CLIPPING */
/* #undef DEBUG_CLIPPING */
#include "debug.h"
/***********************************************************************
* CLIPPING_SetDeviceClipping
*
* Set the clip region of the physical device.
*/
static void CLIPPING_SetDeviceClipping( DC * dc )
{
RGNOBJ *obj = (RGNOBJ *) GDI_GetObjPtr(dc->w.hGCClipRgn, REGION_MAGIC);
if (!obj)
{
fprintf( stderr, "SetDeviceClipping: Rgn is 0. Please report this.\n");
exit(1);
}
if (obj->region.xrgn)
{
XSetRegion( display, dc->u.x.gc, obj->region.xrgn );
XSetClipOrigin( display, dc->u.x.gc, dc->w.DCOrgX, dc->w.DCOrgY );
}
else if (obj->region.pixmap)
{
XSetClipMask( display, dc->u.x.gc, obj->region.pixmap );
XSetClipOrigin( display, dc->u.x.gc,
dc->w.DCOrgX + obj->region.box.left,
dc->w.DCOrgY + obj->region.box.top );
}
else /* Clip everything */
{
XSetClipRectangles( display, dc->u.x.gc, 0, 0, NULL, 0, 0 );
}
}
/***********************************************************************
* CLIPPING_UpdateGCRegion
*
* Update the GC clip region when the ClipRgn or VisRgn have changed.
*/
void CLIPPING_UpdateGCRegion( DC * dc )
{
if (!dc->w.hGCClipRgn) dc->w.hGCClipRgn = CreateRectRgn( 0, 0, 0, 0 );
if (!dc->w.hVisRgn)
{
fprintf( stderr, "UpdateGCRegion: hVisRgn is zero. Please report this.\n" );
exit(1);
}
if (!dc->w.hClipRgn)
CombineRgn( dc->w.hGCClipRgn, dc->w.hVisRgn, 0, RGN_COPY );
else
CombineRgn( dc->w.hGCClipRgn, dc->w.hClipRgn, dc->w.hVisRgn, RGN_AND );
CLIPPING_SetDeviceClipping( dc );
}
/***********************************************************************
* SelectClipRgn (GDI.44)
*/
int SelectClipRgn( HDC hdc, HRGN hrgn )
{
int retval;
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
dprintf_clipping(stddeb, "SelectClipRgn: %d %d\n", hdc, hrgn );
if (hrgn)
{
if (!dc->w.hClipRgn) dc->w.hClipRgn = CreateRectRgn(0,0,0,0);
retval = CombineRgn( dc->w.hClipRgn, hrgn, 0, RGN_COPY );
}
else
{
if (dc->w.hClipRgn) DeleteObject( dc->w.hClipRgn );
dc->w.hClipRgn = 0;
retval = SIMPLEREGION; /* Clip region == whole DC */
}
CLIPPING_UpdateGCRegion( dc );
return retval;
}
/***********************************************************************
* SelectVisRgn (GDI.105)
*/
int SelectVisRgn( HDC hdc, HRGN hrgn )
{
int retval;
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc || !hrgn) return ERROR;
dprintf_clipping(stddeb, "SelectVisRgn: %d %d\n", hdc, hrgn );
retval = CombineRgn( dc->w.hVisRgn, hrgn, 0, RGN_COPY );
CLIPPING_UpdateGCRegion( dc );
return retval;
}
/***********************************************************************
* OffsetClipRgn (GDI.32)
*/
int OffsetClipRgn( HDC hdc, short x, short y )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc)
{
dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
if (!dc) return ERROR;
MF_MetaParam2(dc, META_OFFSETCLIPRGN, x, y);
return NULLREGION; /* ?? */
}
dprintf_clipping(stddeb, "OffsetClipRgn: %d %d,%d\n", hdc, x, y );
if (dc->w.hClipRgn)
{
int retval = OffsetRgn( dc->w.hClipRgn, x, y );
CLIPPING_UpdateGCRegion( dc );
return retval;
}
else return SIMPLEREGION; /* Clip region == client area */
}
/***********************************************************************
* OffsetVisRgn (GDI.102)
*/
int OffsetVisRgn( HDC hdc, short x, short y )
{
int retval;
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
dprintf_clipping(stddeb, "OffsetVisRgn: %d %d,%d\n", hdc, x, y );
retval = OffsetRgn( dc->w.hVisRgn, x, y );
CLIPPING_UpdateGCRegion( dc );
return retval;
}
/***********************************************************************
* CLIPPING_IntersectClipRect
*
* Helper function for {Intersect,Exclude}ClipRect
*/
static int CLIPPING_IntersectClipRect( DC * dc, short left, short top,
short right, short bottom, BOOL exclude)
{
HRGN tempRgn, newRgn;
int ret;
if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return ERROR;
if (!(tempRgn = CreateRectRgn( left, top, right, bottom )))
{
DeleteObject( newRgn );
return ERROR;
}
ret = CombineRgn( newRgn, dc->w.hClipRgn ? dc->w.hClipRgn : dc->w.hVisRgn,
tempRgn, exclude ? RGN_DIFF : RGN_AND);
DeleteObject( tempRgn );
if (ret != ERROR)
{
if (dc->w.hClipRgn) DeleteObject( dc->w.hClipRgn );
dc->w.hClipRgn = newRgn;
CLIPPING_UpdateGCRegion( dc );
}
else DeleteObject( newRgn );
return ret;
}
/***********************************************************************
* ExcludeClipRect (GDI.21)
*/
int ExcludeClipRect( HDC hdc, short left, short top,
short right, short bottom )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc)
{
dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
if (!dc) return ERROR;
MF_MetaParam4(dc, META_EXCLUDECLIPRECT, left, top, right, bottom);
return NULLREGION; /* ?? */
}
dprintf_clipping(stddeb, "ExcludeClipRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
return CLIPPING_IntersectClipRect( dc, left, top, right, bottom, TRUE );
}
/***********************************************************************
* IntersectClipRect (GDI.22)
*/
int IntersectClipRect( HDC hdc, short left, short top,
short right, short bottom )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc)
{
dc = (DC *)GDI_GetObjPtr(hdc, METAFILE_DC_MAGIC);
if (!dc) return ERROR;
MF_MetaParam4(dc, META_INTERSECTCLIPRECT, left, top, right, bottom);
return NULLREGION; /* ?? */
}
dprintf_clipping(stddeb, "IntersectClipRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
return CLIPPING_IntersectClipRect( dc, left, top, right, bottom, FALSE );
}
/***********************************************************************
* CLIPPING_IntersectVisRect
*
* Helper function for {Intersect,Exclude}VisRect
*/
static int CLIPPING_IntersectVisRect( DC * dc, short left, short top,
short right, short bottom, BOOL exclude )
{
HRGN tempRgn, newRgn;
int ret;
if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return ERROR;
if (!(tempRgn = CreateRectRgn( left, top, right, bottom )))
{
DeleteObject( newRgn );
return ERROR;
}
ret = CombineRgn( newRgn, dc->w.hVisRgn, tempRgn,
exclude ? RGN_DIFF : RGN_AND);
DeleteObject( tempRgn );
if (ret != ERROR)
{
RGNOBJ *newObj = (RGNOBJ*)GDI_GetObjPtr( newRgn, REGION_MAGIC);
RGNOBJ *prevObj = (RGNOBJ*)GDI_GetObjPtr( dc->w.hVisRgn, REGION_MAGIC);
if (newObj && prevObj) newObj->header.hNext = prevObj->header.hNext;
DeleteObject( dc->w.hVisRgn );
dc->w.hVisRgn = newRgn;
CLIPPING_UpdateGCRegion( dc );
}
else DeleteObject( newRgn );
return ret;
}
/***********************************************************************
* ExcludeVisRect (GDI.73)
*/
int ExcludeVisRect( HDC hdc, short left, short top, short right, short bottom )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
dprintf_clipping(stddeb, "ExcludeVisRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
return CLIPPING_IntersectVisRect( dc, left, top, right, bottom, TRUE );
}
/***********************************************************************
* IntersectVisRect (GDI.98)
*/
int IntersectVisRect( HDC hdc, short left, short top,
short right, short bottom )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
dprintf_clipping(stddeb, "IntersectVisRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
return CLIPPING_IntersectVisRect( dc, left, top, right, bottom, FALSE );
}
/***********************************************************************
* PtVisible (GDI.103)
*/
BOOL PtVisible( HDC hdc, short x, short y )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
dprintf_clipping(stddeb, "PtVisible: %d %d,%d\n", hdc, x, y );
if (!dc->w.hGCClipRgn) return FALSE;
return PtInRegion( dc->w.hGCClipRgn, XLPTODP(dc,x), YLPTODP(dc,y) );
}
/***********************************************************************
* RectVisible (GDI.104)
*/
BOOL RectVisible( HDC hdc, LPRECT rect )
{
RECT tmpRect;
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return FALSE;
dprintf_clipping(stddeb,"RectVisible: %d %p\n", hdc, rect );
if (!dc->w.hGCClipRgn) return FALSE;
tmpRect.left = XLPTODP(dc, rect->left);
tmpRect.top = YLPTODP(dc, rect->top);
tmpRect.right = XLPTODP(dc, rect->right);
tmpRect.bottom = YLPTODP(dc, rect->bottom);
return RectInRegion( dc->w.hGCClipRgn, &tmpRect );
}
/***********************************************************************
* GetClipBox (GDI.77)
*/
int GetClipBox( HDC hdc, LPRECT rect )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
dprintf_clipping(stddeb, "GetClipBox: %d %p\n", hdc, rect );
return GetRgnBox( dc->w.hGCClipRgn, rect );
}
/***********************************************************************
* SaveVisRgn (GDI.129)
*/
HRGN SaveVisRgn( HDC hdc )
{
HRGN copy;
RGNOBJ *obj, *copyObj;
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return 0;
dprintf_clipping(stddeb, "SaveVisRgn: %d\n", hdc );
if (!dc->w.hVisRgn)
{
fprintf( stderr, "SaveVisRgn: hVisRgn is zero. Please report this.\n" );
exit(1);
}
if (!(obj = (RGNOBJ *) GDI_GetObjPtr( dc->w.hVisRgn, REGION_MAGIC )))
return 0;
if (!(copy = CreateRectRgn( 0, 0, 0, 0 ))) return 0;
CombineRgn( copy, dc->w.hVisRgn, 0, RGN_COPY );
if (!(copyObj = (RGNOBJ *) GDI_GetObjPtr( copy, REGION_MAGIC )))
return 0;
copyObj->header.hNext = obj->header.hNext;
obj->header.hNext = copy;
return copy;
}
/***********************************************************************
* RestoreVisRgn (GDI.130)
*/
int RestoreVisRgn( HDC hdc )
{
HRGN saved;
RGNOBJ *obj, *savedObj;
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc || !dc->w.hVisRgn) return ERROR;
dprintf_clipping(stddeb, "RestoreVisRgn: %d\n", hdc );
if (!(obj = (RGNOBJ *) GDI_GetObjPtr( dc->w.hVisRgn, REGION_MAGIC )))
return ERROR;
if (!(saved = obj->header.hNext)) return ERROR;
if (!(savedObj = (RGNOBJ *) GDI_GetObjPtr( saved, REGION_MAGIC )))
return ERROR;
DeleteObject( dc->w.hVisRgn );
dc->w.hVisRgn = saved;
CLIPPING_UpdateGCRegion( dc );
return savedObj->region.type;
}
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