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/*
* tkMacOSXRegion.c --
*
* Implements X window calls for manipulating regions
*
* Copyright (c) 1995-1996 Sun Microsystems, Inc.
* Copyright 2001, Apple Computer, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkMacOSXRegion.c,v 1.4 2004/10/26 14:16:12 dkf Exp $
*/
#include "tkInt.h"
#include "tkMacOSXInt.h"
#include "X11/X.h"
#include "X11/Xlib.h"
#include <Carbon/Carbon.h>
/*
#include <Windows.h>
#include <QDOffscreen.h>
*/
/*
* Temporary region that can be reused.
*/
static RgnHandle tmpRgn = NULL;
/*
*----------------------------------------------------------------------
*
* TkCreateRegion --
*
* Implements the equivelent of the X window function
* XCreateRegion. See X window documentation for more details.
*
* Results:
* Returns an allocated region handle.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
TkRegion
TkCreateRegion()
{
RgnHandle rgn;
rgn = NewRgn();
return (TkRegion) rgn;
}
/*
*----------------------------------------------------------------------
*
* TkDestroyRegion --
*
* Implements the equivelent of the X window function
* XDestroyRegion. See X window documentation for more details.
*
* Results:
* None.
*
* Side effects:
* Memory is freed.
*
*----------------------------------------------------------------------
*/
void
TkDestroyRegion(
TkRegion r)
{
RgnHandle rgn = (RgnHandle) r;
DisposeRgn(rgn);
}
/*
*----------------------------------------------------------------------
*
* TkIntersectRegion --
*
* Implements the equivilent of the X window function
* XIntersectRegion. See X window documentation for more details.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkIntersectRegion(
TkRegion sra,
TkRegion srb,
TkRegion dr_return)
{
RgnHandle srcRgnA = (RgnHandle) sra;
RgnHandle srcRgnB = (RgnHandle) srb;
RgnHandle destRgn = (RgnHandle) dr_return;
SectRgn(srcRgnA, srcRgnB, destRgn);
}
/*
*----------------------------------------------------------------------
*
* TkUnionRectWithRegion --
*
* Implements the equivelent of the X window function
* XUnionRectWithRegion. See X window documentation for more
* details.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkUnionRectWithRegion(
XRectangle* rectangle,
TkRegion src_region,
TkRegion dest_region_return)
{
RgnHandle srcRgn = (RgnHandle) src_region;
RgnHandle destRgn = (RgnHandle) dest_region_return;
if (tmpRgn == NULL) {
tmpRgn = NewRgn();
}
SetRectRgn(tmpRgn, rectangle->x, rectangle->y,
rectangle->x + rectangle->width, rectangle->y + rectangle->height);
UnionRgn(srcRgn, tmpRgn, destRgn);
}
/*
*----------------------------------------------------------------------
*
* TkRectInRegion --
*
* Implements the equivelent of the X window function
* XRectInRegion. See X window documentation for more details.
*
* Results:
* Returns one of: RectangleOut, RectangleIn, RectanglePart.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TkRectInRegion(
TkRegion region,
int x,
int y,
unsigned int width,
unsigned int height)
{
RgnHandle rgn = (RgnHandle) region;
RgnHandle rectRgn, destRgn;
int result;
rectRgn = NewRgn();
destRgn = NewRgn();
SetRectRgn(rectRgn, x, y, x + width, y + height);
SectRgn(rgn, rectRgn, destRgn);
if (EmptyRgn(destRgn)) {
result = RectangleOut;
} else if (EqualRgn(rgn, destRgn)) {
result = RectangleIn;
} else {
result = RectanglePart;
}
DisposeRgn(rectRgn);
DisposeRgn(destRgn);
return result;
}
/*
*----------------------------------------------------------------------
*
* TkClipBox --
*
* Implements the equivelent of the X window function XClipBox.
* See X window documentation for more details.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkClipBox(
TkRegion r,
XRectangle* rect_return)
{
RgnHandle rgn = (RgnHandle) r;
Rect rect;
GetRegionBounds(rgn,&rect);
rect_return->x = rect.left;
rect_return->y = rect.top;
rect_return->width = rect.right-rect.left;
rect_return->height = rect.bottom-rect.top;
}
/*
*----------------------------------------------------------------------
*
* TkSubtractRegion --
*
* Implements the equivilent of the X window function
* XSubtractRegion. See X window documentation for more details.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkSubtractRegion(
TkRegion sra,
TkRegion srb,
TkRegion dr_return)
{
RgnHandle srcRgnA = (RgnHandle) sra;
RgnHandle srcRgnB = (RgnHandle) srb;
RgnHandle destRgn = (RgnHandle) dr_return;
DiffRgn(srcRgnA, srcRgnB, destRgn);
}
/*
*----------------------------------------------------------------------
*
* TkpBuildRegionFromAlphaData --
*
* Set up a rectangle of the given region based on the supplied
* alpha data.
*
* Results:
* None
*
* Side effects:
* The region is updated, with extra pixels added to it.
*
*----------------------------------------------------------------------
*/
void
TkpBuildRegionFromAlphaData(
TkRegion region, /* Region to update. */
unsigned int x, /* Where in region to update. */
unsigned int y, /* Where in region to update. */
unsigned int width, /* Size of rectangle to update. */
unsigned int height, /* Size of rectangle to update. */
unsigned char *dataPtr, /* Data to read from. */
unsigned int pixelStride, /* num bytes from one piece of alpha
* data to the next in the line. */
unsigned int lineStride) /* num bytes from one line of alpha
* data to the next line. */
{
unsigned char *lineDataPtr;
unsigned int x1, y1, end;
XRectangle rect;
for (y1 = 0; y1 < height; y1++) {
lineDataPtr = dataPtr;
for (x1 = 0; x1 < width; x1 = end) {
/* search for first non-transparent pixel */
while ((x1 < width) && !*lineDataPtr) {
x1++;
lineDataPtr += pixelStride;
}
end = x1;
/* search for first transparent pixel */
while ((end < width) && *lineDataPtr) {
end++;
lineDataPtr += pixelStride;
}
if (end > x1) {
rect.x = x + x1;
rect.y = y + y1;
rect.width = end - x1;
rect.height = 1;
TkUnionRectWithRegion(&rect, region, region);
}
}
dataPtr += lineStride;
}
}
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