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/*
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* Copyright (c) 1999 Greg Haerr <greg@censoft.com>
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* 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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#include "windows.h"
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#include "wintern.h"
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/*
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* Macro to distinguish cases of clipping.
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*/
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#define GAPVAL(leftgap, rightgap, topgap, bottomgap) \
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(((leftgap) << 3) + ((rightgap) << 2) + ((topgap) << 1) + (bottomgap))
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static BOOL MwExcludeClipRect(int minx,int miny,int maxx,int maxy,int *count,
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MWCLIPRECT *cliprects);
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static int MwSplitClipRect(MWCLIPRECT *srcrect, MWCLIPRECT *destrect,
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MWCOORD minx, MWCOORD miny, MWCOORD maxx, MWCOORD maxy);
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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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MWCLIPRECT *clip; /* first clip rectangle */
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int count; /* number of clip rectangles */
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MWCOORD diff; /* difference in coordinates */
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BOOL toomany; /* TRUE if too many clip rects */
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PRECT prc; /* client or window rectangle*/
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MWCLIPRECT cliprects[MAX_CLIPRECTS]; /* clip rectangles */
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if (wp->unmapcount)
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return;
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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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count = 1;
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clip = cliprects;
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clip->x = prc->left;
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clip->y = prc->top;
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clip->width = prc->right - prc->left;
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clip->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 - clip->x;
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if (diff > 0) {
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clip->width -= diff;
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clip->x = pwp->clirect.left;
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}
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diff = pwp->clirect.right - (clip->x + clip->width);
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if (diff < 0)
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clip->width += diff;
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diff = pwp->clirect.top - clip->y;
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if (diff > 0) {
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clip->height -= diff;
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clip->y = pwp->clirect.top;
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}
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diff = pwp->clirect.bottom - (clip->y + clip->height);
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if (diff < 0)
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clip->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 (clip->width <= 0 || clip->height <= 0) {
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GdSetClipRects(hdc->psd, 1, cliprects);
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return;
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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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* 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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toomany = FALSE;
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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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toomany |= MwExcludeClipRect(sibwp->winrect.left,
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sibwp->winrect.top, sibwp->winrect.right-1,
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sibwp->winrect.bottom-1, &count, cliprects);
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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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toomany |= MwExcludeClipRect(sibwp->winrect.left,
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sibwp->winrect.top, sibwp->winrect.right-1,
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sibwp->winrect.bottom-1, &count, cliprects);
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}
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}
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if (toomany) {
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/*GsError(GR_ERROR_TOO_MUCH_CLIPPING, wp->id);*/
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clip->x = 0;
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clip->y = 0;
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clip->width = -1;
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clip->height = -1;
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count = 1;
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}
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/*
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* Set the clip rectangles.
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*/
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GdSetClipRects(hdc->psd, count, cliprects);
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}
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static BOOL
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MwExcludeClipRect(int minx,int miny,int maxx,int maxy,int *count,
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MWCLIPRECT *cliprects)
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{
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int i; /* current index */
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int newcount; /* number of new rectangles */
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BOOL toomany = FALSE;/* TRUE if too many clip rects */
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newcount = *count;
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for (i = 0; i < *count; i++) {
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if (newcount > MAX_CLIPRECTS - 3) {
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toomany = TRUE;
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break;
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}
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newcount += MwSplitClipRect(&cliprects[i],
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&cliprects[newcount],
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minx, miny, maxx, maxy);
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}
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*count = newcount;
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return toomany;
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}
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/*
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* Check the specified clip rectangle against the specified rectangular
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* region, and reduce it or split it up into multiple clip rectangles
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* such that the specified region is not contained in any of the clip
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* rectangles. The source clip rectangle can be modified in place, and
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* in addition more clip rectangles can be generated, which are placed in
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* the indicated destination location. The maximum number of new clip
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* rectangles needed is 3. Returns the number of clip rectangles added.
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* If the source clip rectangle is totally obliterated, it is set to an
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* impossible region and 0 is returned. When splits are done, we prefer
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* to create wide regions instead of high regions.
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*/
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static int
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MwSplitClipRect(MWCLIPRECT *srcrect, MWCLIPRECT *destrect, MWCOORD minx,
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MWCOORD miny, MWCOORD maxx, MWCOORD maxy)
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{
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MWCOORD x;
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MWCOORD y;
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MWCOORD width;
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MWCOORD height;
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MWCOORD dx;
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MWCOORD dy;
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int gaps;
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/*
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* First see if there is any overlap at all.
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* If not, then nothing to do.
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*/
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x = srcrect->x;
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y = srcrect->y;
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width = srcrect->width;
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height = srcrect->height;
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if ((minx > maxx) || (miny > maxy) || (maxx < x) || (maxy < y) ||
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(x + width <= minx) || (y + height <= miny))
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return 0;
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/*
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* There is an overlap. Calculate a value to differentiate
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* various cases, and then handle each case separately. The
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* cases are classified on whether there are gaps on the left,
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* right, top, and bottom sides of the clip rectangle.
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*/
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gaps = 0;
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if (x < minx)
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gaps |= GAPVAL(1, 0, 0, 0);
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if (x + width - 1 > maxx)
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gaps |= GAPVAL(0, 1, 0, 0);
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if (y < miny)
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gaps |= GAPVAL(0, 0, 1, 0);
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if (y + height - 1 > maxy)
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gaps |= GAPVAL(0, 0, 0, 1);
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switch (gaps) {
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case GAPVAL(0, 0, 0, 0): /* no gaps at all */
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srcrect->x = 0;
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srcrect->y = 0;
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srcrect->width = 0;
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srcrect->height = 0;
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return 0;
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case GAPVAL(0, 0, 0, 1): /* gap on bottom */
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dy = maxy - y + 1;
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srcrect->y += dy;
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srcrect->height -= dy;
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return 0;
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case GAPVAL(0, 0, 1, 0): /* gap on top */
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srcrect->height = miny - y;
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return 0;
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case GAPVAL(0, 0, 1, 1): /* gap on top, bottom */
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srcrect->height = miny - y;
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destrect->x = x;
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destrect->width = width;
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destrect->y = maxy + 1;
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destrect->height = y + height - maxy - 1;
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return 1;
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case GAPVAL(0, 1, 0, 0): /* gap on right */
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dx = maxx - x + 1;
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srcrect->x += dx;
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srcrect->width -= dx;
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return 0;
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case GAPVAL(0, 1, 0, 1): /* gap on right, bottom */
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dx = maxx - x + 1;
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srcrect->x += dx;
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srcrect->width -= dx;
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srcrect->height = maxy - y + 1;
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| 280 |
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destrect->x = x;
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destrect->width = width;
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| 282 |
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destrect->y = maxy + 1;
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| 283 |
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destrect->height = y + height - maxy - 1;
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return 1;
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case GAPVAL(0, 1, 1, 0): /* gap on right, top */
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dx = maxx - x + 1;
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srcrect->height = miny - y;
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| 289 |
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destrect->x = x + dx;
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| 290 |
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destrect->width = width - dx;
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| 291 |
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destrect->y = miny;
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| 292 |
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destrect->height = y + height - miny;
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| 293 |
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return 1;
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| 295 |
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case GAPVAL(0, 1, 1, 1): /* gap on right, top, bottom */
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| 296 |
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dx = maxx - x + 1;
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| 297 |
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srcrect->height = miny - y;
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| 298 |
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destrect->x = x;
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| 299 |
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destrect->width = width;
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| 300 |
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destrect->y = maxy + 1;
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| 301 |
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destrect->height = y + height - maxy - 1;
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| 302 |
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destrect++;
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| 303 |
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destrect->x = x + dx;
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| 304 |
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destrect->width = width - dx;
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| 305 |
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destrect->y = miny;
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| 306 |
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destrect->height = maxy - miny + 1;
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| 307 |
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return 2;
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| 308 |
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| 309 |
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case GAPVAL(1, 0, 0, 0): /* gap on left */
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| 310 |
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srcrect->width = minx - x;
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| 311 |
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return 0;
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| 312 |
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| 313 |
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case GAPVAL(1, 0, 0, 1): /* gap on left, bottom */
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srcrect->width = minx - x;
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| 315 |
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srcrect->height = maxy - y + 1;
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| 316 |
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destrect->x = x;
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| 317 |
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destrect->width = width;
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| 318 |
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destrect->y = maxy + 1;
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| 319 |
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destrect->height = y + height - maxy - 1;
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| 320 |
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return 1;
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| 321 |
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| 322 |
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case GAPVAL(1, 0, 1, 0): /* gap on left, top */
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| 323 |
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srcrect->height = miny - y;
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| 324 |
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destrect->x = x;
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| 325 |
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destrect->width = minx - x;
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| 326 |
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destrect->y = miny;
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| 327 |
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destrect->height = y + height - miny;
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| 328 |
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return 1;
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| 329 |
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| 330 |
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case GAPVAL(1, 0, 1, 1): /* gap on left, top, bottom */
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| 331 |
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srcrect->height = miny - y;
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| 332 |
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destrect->x = x;
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| 333 |
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destrect->width = minx - x;
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| 334 |
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destrect->y = miny;
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| 335 |
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destrect->height = maxy - miny + 1;
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| 336 |
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destrect++;
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| 337 |
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destrect->x = x;
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| 338 |
|
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destrect->width = width;
|
| 339 |
|
|
destrect->y = maxy + 1;
|
| 340 |
|
|
destrect->height = y + height - maxy - 1;
|
| 341 |
|
|
return 2;
|
| 342 |
|
|
|
| 343 |
|
|
case GAPVAL(1, 1, 0, 0): /* gap on left, right */
|
| 344 |
|
|
destrect->x = maxx + 1;
|
| 345 |
|
|
destrect->width = x + width - maxx - 1;
|
| 346 |
|
|
destrect->y = y;
|
| 347 |
|
|
destrect->height = height;
|
| 348 |
|
|
srcrect->width = minx - x;
|
| 349 |
|
|
return 1;
|
| 350 |
|
|
|
| 351 |
|
|
case GAPVAL(1, 1, 0, 1): /* gap on left, right, bottom */
|
| 352 |
|
|
dy = maxy - y + 1;
|
| 353 |
|
|
srcrect->y += dy;
|
| 354 |
|
|
srcrect->height -= dy;
|
| 355 |
|
|
destrect->x = x;
|
| 356 |
|
|
destrect->width = minx - x;
|
| 357 |
|
|
destrect->y = y;
|
| 358 |
|
|
destrect->height = dy;
|
| 359 |
|
|
destrect++;
|
| 360 |
|
|
destrect->x = maxx + 1;
|
| 361 |
|
|
destrect->width = x + width - maxx - 1;
|
| 362 |
|
|
destrect->y = y;
|
| 363 |
|
|
destrect->height = dy;
|
| 364 |
|
|
return 2;
|
| 365 |
|
|
|
| 366 |
|
|
case GAPVAL(1, 1, 1, 0): /* gap on left, right, top */
|
| 367 |
|
|
srcrect->height = miny - y;
|
| 368 |
|
|
destrect->x = x;
|
| 369 |
|
|
destrect->width = minx - x;
|
| 370 |
|
|
destrect->y = miny;
|
| 371 |
|
|
destrect->height = y + height - miny;
|
| 372 |
|
|
destrect++;
|
| 373 |
|
|
destrect->x = maxx + 1;
|
| 374 |
|
|
destrect->width = x + width - maxx - 1;
|
| 375 |
|
|
destrect->y = miny;
|
| 376 |
|
|
destrect->height = y + height - miny;
|
| 377 |
|
|
return 2;
|
| 378 |
|
|
|
| 379 |
|
|
case GAPVAL(1, 1, 1, 1): /* gap on all sides */
|
| 380 |
|
|
srcrect->height = miny - y;
|
| 381 |
|
|
destrect->x = x;
|
| 382 |
|
|
destrect->width = minx - x;
|
| 383 |
|
|
destrect->y = miny;
|
| 384 |
|
|
destrect->height = maxy - miny + 1;
|
| 385 |
|
|
destrect++;
|
| 386 |
|
|
destrect->x = maxx + 1;
|
| 387 |
|
|
destrect->width = x + width - maxx - 1;
|
| 388 |
|
|
destrect->y = miny;
|
| 389 |
|
|
destrect->height = maxy - miny + 1;
|
| 390 |
|
|
destrect++;
|
| 391 |
|
|
destrect->x = x;
|
| 392 |
|
|
destrect->width = width;
|
| 393 |
|
|
destrect->y = maxy + 1;
|
| 394 |
|
|
destrect->height = y + height - maxy - 1;
|
| 395 |
|
|
return 3;
|
| 396 |
|
|
}
|
| 397 |
|
|
return 0; /* NOTREACHED */
|
| 398 |
|
|
}
|
