/*
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/*
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* Copyright (c) 2000 Greg Haerr <greg@censoft.com>
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* Copyright (c) 2000 Greg Haerr <greg@censoft.com>
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* Portions Copyright (c) 1991 David I. Bell
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* Portions Copyright (c) 1991 David I. Bell
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* Permission is granted to use, distribute, or modify this source,
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* Permission is granted to use, distribute, or modify this source,
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* provided that this copyright notice remains intact.
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* provided that this copyright notice remains intact.
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*
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*
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* DYNAMICREGIONS GsSetClipWindow
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* DYNAMICREGIONS GsSetClipWindow
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*/
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*/
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#include <stdio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include "serv.h"
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#include "serv.h"
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/*
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/*
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* Set the clip rectangles for a window taking into account other
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* Set the clip rectangles for a window taking into account other
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* windows that may be obscuring it. The windows that may be obscuring
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* windows that may be obscuring it. The windows that may be obscuring
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* this one are the siblings of each direct ancestor which are higher
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* this one are the siblings of each direct ancestor which are higher
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* in priority than those ancestors. Also, each parent limits the visible
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* in priority than those ancestors. Also, each parent limits the visible
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* area of the window. The clipping is not done if it is already up to
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* area of the window. The clipping is not done if it is already up to
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* date of if the window is not outputtable.
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* date of if the window is not outputtable.
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*/
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*/
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void
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void
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GsSetClipWindow(GR_WINDOW *wp, MWCLIPREGION *userregion, int flags)
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GsSetClipWindow(GR_WINDOW *wp, MWCLIPREGION *userregion, int flags)
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{
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{
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GR_WINDOW *orgwp; /* original window pointer */
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GR_WINDOW *orgwp; /* original window pointer */
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GR_WINDOW *pwp; /* parent window */
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GR_WINDOW *pwp; /* parent window */
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GR_WINDOW *sibwp; /* sibling windows */
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GR_WINDOW *sibwp; /* sibling windows */
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GR_COORD minx; /* minimum clip x coordinate */
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GR_COORD minx; /* minimum clip x coordinate */
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GR_COORD miny; /* minimum clip y coordinate */
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GR_COORD miny; /* minimum clip y coordinate */
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GR_COORD maxx; /* maximum clip x coordinate */
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GR_COORD maxx; /* maximum clip x coordinate */
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GR_COORD maxy; /* maximum clip y coordinate */
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GR_COORD maxy; /* maximum clip y coordinate */
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GR_COORD diff; /* difference in coordinates */
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GR_COORD diff; /* difference in coordinates */
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GR_SIZE bs; /* border size */
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GR_SIZE bs; /* border size */
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GR_COORD x, y, width, height;
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GR_COORD x, y, width, height;
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MWCLIPREGION *vis, *r;
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MWCLIPREGION *vis, *r;
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if (wp->unmapcount || !wp->output)
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if (wp->unmapcount || !wp->output)
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return;
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return;
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clipwp = wp;
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clipwp = wp;
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/*
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/*
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* Start with the rectangle for the complete window.
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* Start with the rectangle for the complete window.
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* We will then cut pieces out of it as needed.
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* We will then cut pieces out of it as needed.
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*/
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*/
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x = wp->x;
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x = wp->x;
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y = wp->y;
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y = wp->y;
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width = wp->width;
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width = wp->width;
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height = wp->height;
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height = wp->height;
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/*
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/*
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* First walk upwards through all parent windows,
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* First walk upwards through all parent windows,
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* and restrict the visible part of this window to the part
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* and restrict the visible part of this window to the part
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* that shows through all of those parent windows.
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* that shows through all of those parent windows.
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*/
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*/
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pwp = wp;
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pwp = wp;
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while (pwp != rootwp) {
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while (pwp != rootwp) {
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pwp = pwp->parent;
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pwp = pwp->parent;
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diff = pwp->x - x;
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diff = pwp->x - x;
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if (diff > 0) {
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if (diff > 0) {
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width -= diff;
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width -= diff;
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x = pwp->x;
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x = pwp->x;
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}
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}
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diff = (pwp->x + pwp->width) - (x + width);
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diff = (pwp->x + pwp->width) - (x + width);
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if (diff < 0)
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if (diff < 0)
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width += diff;
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width += diff;
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diff = pwp->y - y;
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diff = pwp->y - y;
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if (diff > 0) {
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if (diff > 0) {
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height -= diff;
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height -= diff;
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y = pwp->y;
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y = pwp->y;
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}
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}
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diff = (pwp->y + pwp->height) - (y + height);
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diff = (pwp->y + pwp->height) - (y + height);
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if (diff < 0)
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if (diff < 0)
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height += diff;
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height += diff;
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}
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}
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/*
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/*
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* If the window is completely clipped out of view, then
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* If the window is completely clipped out of view, then
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* set the clipping region to indicate that.
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* set the clipping region to indicate that.
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*/
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*/
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if (width <= 0 || height <= 0) {
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if (width <= 0 || height <= 0) {
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GdSetClipRegion(clipwp->psd, NULL);
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GdSetClipRegion(clipwp->psd, NULL);
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return;
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return;
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}
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}
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/*
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/*
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* Allocate region to clipped size of window
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* Allocate region to clipped size of window
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*/
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*/
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vis = GdAllocRectRegion(x, y, x+width, y+height);
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vis = GdAllocRectRegion(x, y, x+width, y+height);
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/*
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/*
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* Allocate temp region
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* Allocate temp region
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*/
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*/
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r = GdAllocRegion();
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r = GdAllocRegion();
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/*
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/*
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* Now examine all windows that obscure this window, and
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* Now examine all windows that obscure this window, and
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* for each obscuration, break up the clip rectangles into
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* for each obscuration, break up the clip rectangles into
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* the smaller pieces that are still visible. The windows
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* the smaller pieces that are still visible. The windows
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* that can obscure us are the earlier siblings of all of
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* that can obscure us are the earlier siblings of all of
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* our parents.
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* our parents.
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*/
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*/
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orgwp = wp;
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orgwp = wp;
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pwp = wp;
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pwp = wp;
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while (pwp != NULL) {
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while (pwp != NULL) {
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wp = pwp;
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wp = pwp;
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pwp = wp->parent;
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pwp = wp->parent;
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if(!pwp) {
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if(!pwp) {
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/* We're clipping the root window*/
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/* We're clipping the root window*/
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if (!(flags & GR_MODE_EXCLUDECHILDREN))
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if (!(flags & GR_MODE_EXCLUDECHILDREN))
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/* start with root's children*/
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/* start with root's children*/
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sibwp = rootwp->children;
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sibwp = rootwp->children;
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else sibwp = NULL; /* no search*/
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else sibwp = NULL; /* no search*/
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wp = NULL; /* search all root's children*/
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wp = NULL; /* search all root's children*/
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} else {
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} else {
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sibwp = pwp->children; /* clip siblings*/
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sibwp = pwp->children; /* clip siblings*/
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}
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}
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for (; sibwp != wp; sibwp = sibwp->siblings) {
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for (; sibwp != wp; sibwp = sibwp->siblings) {
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if (sibwp->unmapcount || !sibwp->output)
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if (sibwp->unmapcount || !sibwp->output)
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continue;
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continue;
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bs = sibwp->bordersize;
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bs = sibwp->bordersize;
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minx = sibwp->x - bs;
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minx = sibwp->x - bs;
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miny = sibwp->y - bs;
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miny = sibwp->y - bs;
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maxx = sibwp->x + sibwp->width + bs;
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maxx = sibwp->x + sibwp->width + bs;
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maxy = sibwp->y + sibwp->height + bs;
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maxy = sibwp->y + sibwp->height + bs;
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GdSetRectRegion(r, minx, miny, maxx, maxy);
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GdSetRectRegion(r, minx, miny, maxx, maxy);
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GdSubtractRegion(vis, vis, r);
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GdSubtractRegion(vis, vis, r);
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}
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}
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/* if not clipping the root window, stop when you reach it*/
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/* if not clipping the root window, stop when you reach it*/
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if (pwp == rootwp)
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if (pwp == rootwp)
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break;
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break;
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}
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}
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wp = orgwp;
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wp = orgwp;
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/*
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/*
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* If not the root window, clip all children.
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* If not the root window, clip all children.
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* (Root window's children are are clipped above)
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* (Root window's children are are clipped above)
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*/
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*/
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if(wp != rootwp && !(flags & GR_MODE_EXCLUDECHILDREN)) {
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if(wp != rootwp && !(flags & GR_MODE_EXCLUDECHILDREN)) {
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for (sibwp=wp->children; sibwp; sibwp = sibwp->siblings) {
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for (sibwp=wp->children; sibwp; sibwp = sibwp->siblings) {
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if (sibwp->unmapcount || !sibwp->output)
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if (sibwp->unmapcount || !sibwp->output)
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continue;
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continue;
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bs = sibwp->bordersize;
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bs = sibwp->bordersize;
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minx = sibwp->x - bs;
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minx = sibwp->x - bs;
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miny = sibwp->y - bs;
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miny = sibwp->y - bs;
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maxx = sibwp->x + sibwp->width + bs;
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maxx = sibwp->x + sibwp->width + bs;
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maxy = sibwp->y + sibwp->height + bs;
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maxy = sibwp->y + sibwp->height + bs;
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GdSetRectRegion(r, minx, miny, maxx, maxy);
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GdSetRectRegion(r, minx, miny, maxx, maxy);
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GdSubtractRegion(vis, vis, r);
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GdSubtractRegion(vis, vis, r);
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}
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}
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}
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}
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/*
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/*
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* Intersect with user region, if set.
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* Intersect with user region, if set.
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*/
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*/
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if (userregion) {
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if (userregion) {
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/* temporarily offset region by window coordinates*/
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/* temporarily offset region by window coordinates*/
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GdOffsetRegion(userregion, wp->x, wp->y);
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GdOffsetRegion(userregion, wp->x, wp->y);
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GdIntersectRegion(vis, vis, userregion);
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GdIntersectRegion(vis, vis, userregion);
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GdOffsetRegion(userregion, -wp->x, -wp->y);
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GdOffsetRegion(userregion, -wp->x, -wp->y);
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}
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}
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/*
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/*
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* Set the clip region (later destroy handled by GdSetClipRegion)
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* Set the clip region (later destroy handled by GdSetClipRegion)
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*/
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*/
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GdSetClipRegion(clipwp->psd, vis);
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GdSetClipRegion(clipwp->psd, vis);
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/*
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/*
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* Destroy temp region
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* Destroy temp region
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*/
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*/
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GdDestroyRegion(r);
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GdDestroyRegion(r);
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}
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}
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