/* * DC clipping functions * * Copyright 1993 Alexandre Julliard */ static char Copyright[] = "Copyright Alexandre Julliard, 1993"; #include #include "gdi.h" /*********************************************************************** * CLIPPING_SetDeviceClipping * * Set the clip region of the physical device. */ void CLIPPING_SetDeviceClipping( DC * dc ) { 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, dc->w.DCOrgX + obj->region.box.left, dc->w.DCOrgY + obj->region.box.top ); } else { XSetClipMask( XT_display, dc->u.x.gc, None ); XSetClipOrigin( XT_display, dc->u.x.gc, dc->w.DCOrgX, dc->w.DCOrgY ); } } /*********************************************************************** * CLIPPING_UpdateGCRegion * * Update the GC clip region when the ClipRgn or 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 ); } CLIPPING_SetDeviceClipping( dc ); } /*********************************************************************** * 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 = 0, prevRgn = 0, newRgn = 0; RGNOBJ *newObj, *prevObj; int retval; if (!*hrgn) { if (!(*hrgn = CreateRectRgn( 0, 0, dc->w.DCSizeX, dc->w.DCSizeY ))) goto Error; prevRgn = *hrgn; } if (!(newRgn = CreateRectRgn( 0, 0, 0, 0))) goto Error; if (!(tempRgn = CreateRectRgn( left, top, right, bottom ))) goto Error; retval = CombineRgn( newRgn, *hrgn, tempRgn, exclude ? RGN_DIFF : RGN_AND); if (retval == ERROR) goto Error; 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 ); if (*hrgn) DeleteObject( *hrgn ); *hrgn = newRgn; CLIPPING_UpdateGCRegion( dc ); return retval; Error: if (tempRgn) DeleteObject( tempRgn ); if (newRgn) DeleteObject( newRgn ); if (prevRgn) { DeleteObject( prevRgn ); *hrgn = 0; } return ERROR; } /*********************************************************************** * 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 { rect->top = rect->left = 0; rect->right = dc->w.DCSizeX; rect->bottom = dc->w.DCSizeY; 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; }