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// included by gdk2.pp
{$IFDEF read_interface_types}
PGdkRegionBox = ^TGdkRegionBox;
TGdkRegionBox = TGdkSegment;
{
clip region
}
PGdkRegion = ^TGdkRegion;
TGdkRegion = record
size : longint;
numRects : longint;
rects : PGdkRegionBox;
extents : TGdkRegionBox;
end;
{
used to allocate buffers for points and link
the buffers together
}
PPOINTBLOCK = ^TPOINTBLOCK;
TPOINTBLOCK = record
pts : array[0..(NUMPTSTOBUFFER)-1] of TGdkPoint;
next : PPOINTBLOCK;
end;
{$ENDIF read_interface_types}
//------------------------------------------------------------------------------
{$IFDEF read_interface_rest}
{ 1 if two BOXs overlap.
0 if two BOXs do not overlap.
Remember, x2 and y2 are not in the region
}
function gdkregion_EXTENTCHECK(r1, r2: PGdkRegionBox): boolean;
{
update region extents
}
procedure gdkregion_EXTENTS(r: PGdkRegionBox; idRect: PGdkRegion);
{
Check to see if there is enough memory in the present region.
}
function gdkregion_MEMCHECK(reg: PGdkRegion; var ARect, firstrect: PGdkRegionBox): boolean;
{ this routine checks to see if the previous rectangle is the same
or subsumes the new rectangle to add.
}
function gdkregion_CHECK_PREVIOUS(Reg: PGdkRegion; R: PGdkRegionBox;
Rx1,Ry1,Rx2,Ry2 : gint) : boolean;
{ add a rectangle to the given Region }
procedure gdkregion_ADDRECT(reg: PGdkRegion; r: PGdkRegionBox;
rx1, ry1, rx2, ry2: gint);
{ add a rectangle to the given Region }
procedure gdkregion_ADDRECTNOX(reg: PGdkRegion; r: PGdkRegionBox; rx1,ry1,rx2,ry2: gint);
{ }
function gdkregion_EMPTY_REGION(pReg: PGdkRegion): boolean;
{pReg->numRects = 0}
function gdkregion_REGION_NOT_EMPTY(pReg : PGdkRegion) : boolean;
function gdkregion_INBOX(r: TGdkRegionBox; x,y : gint) : boolean;
{$endif read_interface_rest}
//------------------------------------------------------------------------------
{$IFDEF read_implementation}
function gdkregion_EXTENTCHECK(r1, r2: PGdkRegionBox): boolean;
begin
gdkregion_EXTENTCHECK:=(r1^.x2 > r2^.x1) and (r1^.x1 < r2^.x2) and (r1^.y2 > r2^.y1)
and (r1^.y1 < r2^.y2)
end;
procedure gdkregion_EXTENTS(r: PGdkRegionBox; idRect: PGdkRegion);
begin
if (r^.x1 < idRect^.extents.x1) then idRect^.extents.x1 := r^.x1;
if r^.y1 < idRect^.extents.y1 then idRect^.extents.y1 := r^.y1;
if r^.x2 > idRect^.extents.x2 then idRect^.extents.x2 := r^.x2;
end;
function gdkregion_MEMCHECK(reg: PGdkRegion;
var ARect, firstrect: PGdkRegionBox): boolean;
begin
{$IFNDEF KYLIX}
if reg^.numRects >= reg^.size - 1 then begin
firstrect := PGdkRegionBox(g_renew (SizeOf(TGdkRegionBox), firstrect,
2 * reg^.size));
reg^.size:=reg^.size*2;
Arect:=@firstrect[reg^.numRects];
end;
Result:=true;
{$ENDIF}
end;
function gdkregion_CHECK_PREVIOUS(Reg: PGdkRegion; R: PGdkRegionBox;
Rx1,Ry1,Rx2,Ry2 : gint) : boolean;
begin
{$IFNDEF KYLIX}
gdkregion_CHECK_PREVIOUS:=
not (((((Reg^.numRects > 0) and ((R - 1)^.y1 = Ry1))
and ((R - 1)^.y2 = Ry2))
and ((R - 1)^.x1 <= Rx1))
and ((R - 1)^.x2 >= Rx2));
{$ENDIF}
end;
procedure gdkregion_ADDRECT(reg: PGdkRegion; r: PGdkRegionBox;
rx1, ry1, rx2, ry2: gint);
begin
if ((rx1 < rx2) and (ry1 < ry2)
and gdkregion_CHECK_PREVIOUS(reg, r, rx1, ry1, rx2, ry2)) then begin
r^.x1 := rx1;
r^.y1 := ry1;
r^.x2 := rx2;
r^.y2 := ry2;
end;
end;
procedure gdkregion_ADDRECTNOX(reg: PGdkRegion; r: PGdkRegionBox;
rx1,ry1,rx2,ry2: gint);
begin
if ((rx1 < rx2) and (ry1 < ry2)
and gdkregion_CHECK_PREVIOUS(reg, r, rx1, ry1, rx2, ry2)) then begin
r^.x1 := rx1;
r^.y1 := ry1;
r^.x2 := rx2;
r^.y2 := ry2;
inc(reg^.numRects);
end;
end;
function gdkregion_EMPTY_REGION(pReg: PGdkRegion): boolean;
begin
gdkregion_EMPTY_REGION:=pReg^.numRects=0;
end;
function gdkregion_REGION_NOT_EMPTY(pReg : PGdkRegion) : boolean;
begin
gdkregion_REGION_NOT_EMPTY:=pReg^.numRects<>0;
end;
function gdkregion_INBOX(r: TGdkRegionBox; x,y : gint) : boolean;
begin
gdkregion_INBOX:=(((r.x2 > x) and (r.x1 <= x)) and (r.y2 > y)) and (r.y1<= y);
end;
{$ENDIF}
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