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+/* $XFree86: xc/programs/Xserver/afb/afbclip.c,v 3.2 2001/10/28 03:32:57 tsi Exp $ */
+/***********************************************************
+
+Copyright (c) 1987 X Consortium
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of the X Consortium shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from the X Consortium.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+******************************************************************/
+/* $XConsortium: afbclip.c,v 5.6 94/04/17 20:28:19 dpw Exp $ */
+
+#include "X.h"
+#include "miscstruct.h"
+#include "pixmapstr.h"
+#include "scrnintstr.h"
+#include "regionstr.h"
+#include "gc.h"
+#include "maskbits.h"
+#include "mi.h"
+#include "afb.h"
+
+#define ADDRECT(reg,r,fr,rx1,ry1,rx2,ry2) \
+if (((rx1) < (rx2)) && ((ry1) < (ry2)) && \
+ (!((reg)->data->numRects && \
+ ((r-1)->y1 == (ry1)) && \
+ ((r-1)->y2 == (ry2)) && \
+ ((r-1)->x1 <= (rx1)) && \
+ ((r-1)->x2 >= (rx2))))) \
+{ \
+ if ((reg)->data->numRects == (reg)->data->size) \
+ { \
+ miRectAlloc(reg, 1); \
+ fr = REGION_BOXPTR(reg); \
+ r = fr + (reg)->data->numRects; \
+ } \
+ r->x1 = (rx1); \
+ r->y1 = (ry1); \
+ r->x2 = (rx2); \
+ r->y2 = (ry2); \
+ (reg)->data->numRects++; \
+ if(r->x1 < (reg)->extents.x1) \
+ (reg)->extents.x1 = r->x1; \
+ if(r->x2 > (reg)->extents.x2) \
+ (reg)->extents.x2 = r->x2; \
+ r++; \
+}
+
+/* Convert bitmap clip mask into clipping region.
+ * First, goes through each line and makes boxes by noting the transitions
+ * from 0 to 1 and 1 to 0.
+ * Then it coalesces the current line with the previous if they have boxes
+ * at the same X coordinates.
+ */
+RegionPtr
+afbPixmapToRegion(pPix)
+ PixmapPtr pPix;
+{
+ register RegionPtr pReg;
+ register PixelType *pw, w;
+ register int ib;
+ int width, h, base, rx1 = 0, crects;
+ PixelType *pwLineEnd;
+ int irectPrevStart, irectLineStart;
+ register BoxPtr prectO, prectN;
+ BoxPtr FirstRect, rects, prectLineStart;
+ Bool fInBox, fSame;
+ register PixelType mask0 = mask[0];
+ PixelType *pwLine;
+ int nWidth;
+
+ pReg = REGION_CREATE(pPix->drawable.pScreen, NULL, 1);
+ if(!pReg)
+ return NullRegion;
+ FirstRect = REGION_BOXPTR(pReg);
+ rects = FirstRect;
+
+ pwLine = (PixelType *) pPix->devPrivate.ptr;
+ nWidth = pPix->devKind / PGSZB;
+
+ width = pPix->drawable.width;
+ pReg->extents.x1 = width - 1;
+ pReg->extents.x2 = 0;
+ irectPrevStart = -1;
+ for(h = 0; h < pPix->drawable.height; h++) {
+ pw = pwLine;
+ pwLine += nWidth;
+ irectLineStart = rects - FirstRect;
+ /* If the Screen left most bit of the word is set, we're starting in
+ * a box */
+ if(*pw & mask0) {
+ fInBox = TRUE;
+ rx1 = 0;
+ }
+ else
+ fInBox = FALSE;
+ /* Process all words which are fully in the pixmap */
+ pwLineEnd = pw + (width >> PWSH);
+ for (base = 0; pw < pwLineEnd; base += PPW) {
+ w = *pw++;
+ if (fInBox) {
+ if (!~w)
+ continue;
+ } else {
+ if (!w)
+ continue;
+ }
+ for(ib = 0; ib < PPW; ib++) {
+ /* If the Screen left most bit of the word is set, we're
+ * starting a box */
+ if(w & mask0) {
+ if(!fInBox) {
+ rx1 = base + ib;
+ /* start new box */
+ fInBox = TRUE;
+ }
+ } else {
+ if(fInBox) {
+ /* end box */
+ ADDRECT(pReg, rects, FirstRect,
+ rx1, h, base + ib, h + 1);
+ fInBox = FALSE;
+ }
+ }
+ /* Shift the word VISUALLY left one. */
+ w = SCRLEFT(w, 1);
+ }
+ }
+ if(width & PIM) {
+ /* Process final partial word on line */
+ w = *pw++;
+ for(ib = 0; ib < (width & PIM); ib++) {
+ /* If the Screen left most bit of the word is set, we're
+ * starting a box */
+ if(w & mask0) {
+ if(!fInBox) {
+ rx1 = base + ib;
+ /* start new box */
+ fInBox = TRUE;
+ }
+ } else {
+ if(fInBox) {
+ /* end box */
+ ADDRECT(pReg, rects, FirstRect,
+ rx1, h, base + ib, h + 1);
+ fInBox = FALSE;
+ }
+ }
+ /* Shift the word VISUALLY left one. */
+ w = SCRLEFT(w, 1);
+ }
+ }
+ /* If scanline ended with last bit set, end the box */
+ if(fInBox) {
+ ADDRECT(pReg, rects, FirstRect,
+ rx1, h, base + (width & PIM), h + 1);
+ }
+ /* if all rectangles on this line have the same x-coords as
+ * those on the previous line, then add 1 to all the previous y2s and
+ * throw away all the rectangles from this line
+ */
+ fSame = FALSE;
+ if(irectPrevStart != -1) {
+ crects = irectLineStart - irectPrevStart;
+ if(crects == ((rects - FirstRect) - irectLineStart)) {
+ prectO = FirstRect + irectPrevStart;
+ prectN = prectLineStart = FirstRect + irectLineStart;
+ fSame = TRUE;
+ while(prectO < prectLineStart) {
+ if((prectO->x1 != prectN->x1) || (prectO->x2 != prectN->x2)) {
+ fSame = FALSE;
+ break;
+ }
+ prectO++;
+ prectN++;
+ }
+ if (fSame) {
+ prectO = FirstRect + irectPrevStart;
+ while(prectO < prectLineStart) {
+ prectO->y2 += 1;
+ prectO++;
+ }
+ rects -= crects;
+ pReg->data->numRects -= crects;
+ }
+ }
+ }
+ if(!fSame)
+ irectPrevStart = irectLineStart;
+ }
+ if (!pReg->data->numRects)
+ pReg->extents.x1 = pReg->extents.x2 = 0;
+ else
+ {
+ pReg->extents.y1 = REGION_BOXPTR(pReg)->y1;
+ pReg->extents.y2 = REGION_END(pReg)->y2;
+ if (pReg->data->numRects == 1) {
+ xfree(pReg->data);
+ pReg->data = (RegDataPtr)NULL;
+ }
+ }
+#ifdef DEBUG
+ if (!miValidRegion(pReg))
+ FatalError("Assertion failed file %s, line %d: expr\n", __FILE__, __LINE__);
+#endif
+ return(pReg);
+}
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