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Sweden-Number/objects/clipping.c

355 lines
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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"
/***********************************************************************
* CLIPPING_UpdateGCRegion
*
* Update the GC clip region when the ClipRgn of VisRgn have changed.
*/
static void CLIPPING_UpdateGCRegion( DC * dc )
{
if (!dc->w.hGCClipRgn) dc->w.hGCClipRgn = CreateRectRgn(0,0,0,0);
if (!dc->w.hVisRgn)
{
if (!dc->w.hClipRgn)
{
DeleteObject( dc->w.hGCClipRgn );
dc->w.hGCClipRgn = 0;
}
else
CombineRgn( dc->w.hGCClipRgn, dc->w.hClipRgn, 0, RGN_COPY );
}
else
{
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 );
}
if (dc->w.hGCClipRgn)
{
RGNOBJ *obj = (RGNOBJ *) GDI_GetObjPtr( dc->w.hGCClipRgn, REGION_MAGIC );
XSetClipMask( XT_display, dc->u.x.gc, obj->region.pixmap );
XSetClipOrigin( XT_display, dc->u.x.gc,
obj->region.box.left, obj->region.box.top );
}
else
{
XSetClipMask( XT_display, dc->u.x.gc, None );
XSetClipOrigin( XT_display, dc->u.x.gc, 0, 0 );
}
}
/***********************************************************************
* CLIPPING_SelectRgn
*
* Helper function for SelectClipRgn() and SelectVisRgn().
*/
static int CLIPPING_SelectRgn( DC * dc, HRGN * hrgnPrev, HRGN hrgn )
{
int retval;
if (hrgn)
{
if (!*hrgnPrev) *hrgnPrev = CreateRectRgn(0,0,0,0);
retval = CombineRgn( *hrgnPrev, hrgn, 0, RGN_COPY );
}
else
{
if (*hrgnPrev) DeleteObject( *hrgnPrev );
*hrgnPrev = 0;
retval = SIMPLEREGION; /* Clip region == client area */
}
CLIPPING_UpdateGCRegion( dc );
return retval;
}
/***********************************************************************
* SelectClipRgn (GDI.44)
*/
int SelectClipRgn( HDC hdc, HRGN hrgn )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "SelectClipRgn: %d %d\n", hdc, hrgn );
#endif
return CLIPPING_SelectRgn( dc, &dc->w.hClipRgn, hrgn );
}
/***********************************************************************
* SelectVisRgn (GDI.105)
*/
int SelectVisRgn( HDC hdc, HRGN hrgn )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "SelectVisRgn: %d %d\n", hdc, hrgn );
#endif
return CLIPPING_SelectRgn( dc, &dc->w.hVisRgn, hrgn );
}
/***********************************************************************
* OffsetClipRgn (GDI.32)
*/
int OffsetClipRgn( HDC hdc, short x, short y )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "OffsetClipRgn: %d %d,%d\n", hdc, x, y );
#endif
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 )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "OffsetVisRgn: %d %d,%d\n", hdc, x, y );
#endif
if (dc->w.hVisRgn)
{
int retval = OffsetRgn( dc->w.hVisRgn, x, y );
CLIPPING_UpdateGCRegion( dc );
return retval;
}
else return SIMPLEREGION; /* Clip region == client area */
}
/***********************************************************************
* CLIPPING_IntersectRect
*
* Helper function for {Intersect,Exclude}{Clip,Vis}Rect
*/
int CLIPPING_IntersectRect( DC * dc, HRGN * hrgn, short left, short top,
short right, short bottom, int exclude )
{
HRGN tempRgn, newRgn;
RGNOBJ *newObj, *prevObj;
int retval;
if (!*hrgn) return NULLREGION;
if (!(newRgn = CreateRectRgn( 0, 0, 0, 0))) return ERROR;
if (!(tempRgn = CreateRectRgn( left, top, right, bottom )))
{
DeleteObject( newRgn );
return ERROR;
}
retval = CombineRgn( newRgn, *hrgn, tempRgn, exclude ? RGN_DIFF : RGN_AND);
newObj = (RGNOBJ *) GDI_GetObjPtr( newRgn, REGION_MAGIC );
prevObj = (RGNOBJ *) GDI_GetObjPtr( *hrgn, REGION_MAGIC );
if (newObj && prevObj) newObj->header.hNext = prevObj->header.hNext;
DeleteObject( tempRgn );
DeleteObject( *hrgn );
*hrgn = newRgn;
CLIPPING_UpdateGCRegion( dc );
return retval;
}
/***********************************************************************
* 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) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "ExcludeClipRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
#endif
return CLIPPING_IntersectRect( dc, &dc->w.hClipRgn, left, top,
right, bottom, 1 );
}
/***********************************************************************
* 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) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "IntersectClipRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
#endif
return CLIPPING_IntersectRect( dc, &dc->w.hClipRgn, left, top,
right, bottom, 0 );
}
/***********************************************************************
* 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;
#ifdef DEBUG_CLIPPING
printf( "ExcludeVisRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
#endif
return CLIPPING_IntersectRect( dc, &dc->w.hVisRgn, left, top,
right, bottom, 1 );
}
/***********************************************************************
* 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;
#ifdef DEBUG_CLIPPING
printf( "IntersectVisRect: %d %dx%d,%dx%d\n",
hdc, left, top, right, bottom );
#endif
return CLIPPING_IntersectRect( dc, &dc->w.hVisRgn, left, top,
right, bottom, 0 );
}
/***********************************************************************
* PtVisible (GDI.103)
*/
BOOL PtVisible( HDC hdc, short x, short y )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "PtVisible: %d %d,%d\n", hdc, x, y );
#endif
if (!dc->w.hClipRgn) return FALSE;
return PtInRegion( dc->w.hClipRgn, x, y );
}
/***********************************************************************
* RectVisible (GDI.104)
*/
BOOL RectVisible( HDC hdc, LPRECT rect )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "RectVisible: %d %p\n", hdc, rect );
#endif
if (!dc->w.hClipRgn) return FALSE;
return RectInRegion( dc->w.hClipRgn, rect );
}
/***********************************************************************
* GetClipBox (GDI.77)
*/
int GetClipBox( HDC hdc, LPRECT rect )
{
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "GetClipBox: %d %p\n", hdc, rect );
#endif
if (dc->w.hGCClipRgn) return GetRgnBox( dc->w.hGCClipRgn, rect );
else
{
Window root;
int width, height, x, y, border, depth;
XGetGeometry( XT_display, dc->u.x.drawable, &root, &x, &y,
&width, &height, &border, &depth );
rect->top = rect->left = 0;
rect->right = width & 0xffff;
rect->bottom = height & 0xffff;
return SIMPLEREGION;
}
}
/***********************************************************************
* SaveVisRgn (GDI.129)
*/
HRGN SaveVisRgn( HDC hdc )
{
HRGN copy;
RGNOBJ *obj, *copyObj;
DC * dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC );
if (!dc) return 0;
#ifdef DEBUG_CLIPPING
printf( "SaveVisRgn: %d\n", hdc );
#endif
if (!dc->w.hVisRgn) return 0;
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) return ERROR;
#ifdef DEBUG_CLIPPING
printf( "RestoreVisRgn: %d\n", hdc );
#endif
if (!dc->w.hVisRgn) return ERROR;
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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