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/*
* tkWinRegion.c --
*
* Tk Region emulation code.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkWinRegion.c 1.7 96/05/03 11:05:54
*/
#include "tkWinInt.h"
/*
*----------------------------------------------------------------------
*
* TkCreateRegion --
*
* Construct an empty region.
*
* Results:
* Returns a new region handle.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
TkRegion
TkCreateRegion()
{
RECT rect;
memset(&rect, 0, sizeof(RECT));
return (TkRegion) CreateRectRgnIndirect(&rect);
}
/*
*----------------------------------------------------------------------
*
* TkDestroyRegion --
*
* Destroy the specified region.
*
* Results:
* None.
*
* Side effects:
* Frees the storage associated with the specified region.
*
*----------------------------------------------------------------------
*/
void
TkDestroyRegion(r)
TkRegion r;
{
DeleteObject((HRGN) r);
}
/*
*----------------------------------------------------------------------
*
* TkClipBox --
*
* Computes the bounding box of a region.
*
* Results:
* Sets rect_return to the bounding box of the region.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkClipBox(r, rect_return)
TkRegion r;
XRectangle* rect_return;
{
RECT rect;
GetRgnBox((HRGN)r, &rect);
rect_return->x = (short) rect.left;
rect_return->y = (short) rect.top;
rect_return->width = (short) (rect.right - rect.left);
rect_return->height = (short) (rect.bottom - rect.top);
}
/*
*----------------------------------------------------------------------
*
* TkIntersectRegion --
*
* Compute the intersection of two regions.
*
* Results:
* Returns the result in the dr_return region.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkIntersectRegion(sra, srb, dr_return)
TkRegion sra;
TkRegion srb;
TkRegion dr_return;
{
CombineRgn((HRGN) dr_return, (HRGN) sra, (HRGN) srb, RGN_AND);
}
/*
*----------------------------------------------------------------------
*
* TkUnionRectWithRegion --
*
* Create the union of a source region and a rectangle.
*
* Results:
* Returns the result in the dr_return region.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkUnionRectWithRegion(rectangle, src_region, dest_region_return)
XRectangle* rectangle;
TkRegion src_region;
TkRegion dest_region_return;
{
HRGN rectRgn = CreateRectRgn(rectangle->x, rectangle->y,
rectangle->x + rectangle->width, rectangle->y + rectangle->height);
CombineRgn((HRGN) dest_region_return, (HRGN) src_region,
(HRGN) rectRgn, RGN_OR);
DeleteObject(rectRgn);
}
/*
*----------------------------------------------------------------------
*
* TkRectInRegion --
*
* Test whether a given rectangle overlaps with a region.
*
* Results:
* Returns RectanglePart or RectangleOut. Note that this is
* not a complete implementation since it doesn't test for
* RectangleIn.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TkRectInRegion(r, x, y, width, height)
TkRegion r;
int x;
int y;
unsigned int width;
unsigned int height;
{
RECT rect;
rect.top = y;
rect.left = x;
rect.bottom = y+height;
rect.right = x+width;
return RectInRegion((HRGN)r, &rect) ? RectanglePart : RectangleOut;
}
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