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/*
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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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* 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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*
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* DYNAMICREGIONS MwSetClipWindow
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*/
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#include "windows.h"
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#include "wintern.h"
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/*
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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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* 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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* area of the window.
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*/
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void
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MwSetClipWindow(HDC hdc)
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{
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HWND wp = hdc->hwnd;
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HWND pwp; /* parent window */
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HWND sibwp; /* sibling windows */
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MWCOORD diff; /* difference in coordinates */
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PRECT prc; /* client or window rectangle*/
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MWCLIPREGION *vis, *r;
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MWCOORD x, y, width, height;
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/*
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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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*/
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prc = MwIsClientDC(hdc)? &wp->clirect: &wp->winrect;
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x = prc->left;
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y = prc->top;
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width = prc->right - prc->left;
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height = prc->bottom - prc->top;
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/*
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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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* that shows through all of those parent windows client areas.
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*/
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pwp = wp;
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while (pwp != rootwp) {
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pwp = pwp->parent;
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diff = pwp->clirect.left - x;
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if (diff > 0) {
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width -= diff;
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x = pwp->clirect.left;
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}
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diff = pwp->clirect.right - (x + width);
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if (diff < 0)
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width += diff;
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diff = pwp->clirect.top - y;
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if (diff > 0) {
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height -= diff;
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y = pwp->clirect.top;
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}
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diff = pwp->clirect.bottom - (y + height);
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if (diff < 0)
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height += diff;
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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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* set the clipping region to indicate that.
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*/
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if (width <= 0 || height <= 0) {
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GdSetClipRegion(hdc->psd, NULL);
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return;
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}
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/*
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* Allocate initial vis region to parent-clipped size of window
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*/
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vis = GdAllocRectRegion(x, y, x+width, y+height);
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/*
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* Allocate temp region
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*/
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r = GdAllocRegion();
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/*
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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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* 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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* our parents. When clipping the root window, search all children.
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*/
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pwp = wp;
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while (pwp != NULL) {
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wp = pwp;
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pwp = wp->parent;
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if(!pwp) {
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/* We're clipping the root window*/
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if(hdc->flags & DCX_CLIPCHILDREN)
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/* start with root's children*/
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sibwp = rootwp->children;
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else sibwp = NULL; /* no search*/
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wp = NULL; /* search all root's children*/
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} else {
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if(hdc->flags & DCX_CLIPSIBLINGS)
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sibwp = pwp->children;
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else sibwp = wp; /* no search*/
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}
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for (; sibwp != wp; sibwp = sibwp->siblings) {
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if (sibwp->unmapcount)
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continue;
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GdSetRectRegionIndirect(r, &sibwp->winrect);
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GdSubtractRegion(vis, vis, r);
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}
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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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break;
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}
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/*
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* If not the root window and we're going to be drawing
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* in the client area, clip all children. This is
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* required for non-special paint handling for child windows.
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* Non-client dc's don't clip children in order to get
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* proper border clipping in the case of border-clipped children.
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*/
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wp = hdc->hwnd;
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if(wp != rootwp && MwIsClientDC(hdc)) {
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for (sibwp=wp->children; sibwp; sibwp = sibwp->siblings) {
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if (sibwp->unmapcount)
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continue;
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GdSetRectRegionIndirect(r, &sibwp->winrect);
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GdSubtractRegion(vis, vis, r);
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}
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}
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#if UPDATEREGIONS
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/*
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* Intersect with update region, unless requested not to.
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*/
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if(!(hdc->flags & DCX_EXCLUDEUPDATE))
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GdIntersectRegion(vis, vis, wp->update);
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#endif
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/*
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* Intersect with user region, if set.
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*/
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if (hdc->region)
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GdIntersectRegion(vis, vis, hdc->region->rgn);
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/*
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* Set the clip region (later destroy handled by GdSetClipRegion)
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*/
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GdSetClipRegion(hdc->psd, vis);
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/*
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* Destroy temp region
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*/
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GdDestroyRegion(r);
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}
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