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-rwxr-xr-xrfbregion.c826
1 files changed, 826 insertions, 0 deletions
diff --git a/rfbregion.c b/rfbregion.c
new file mode 100755
index 0000000..59b76c5
--- /dev/null
+++ b/rfbregion.c
@@ -0,0 +1,826 @@
+/* -=- sraRegion.c
+ * Copyright (c) 2001 James "Wez" Weatherall, Johannes E. Schindelin
+ *
+ * A general purpose region clipping library
+ * Only deals with rectangular regions, though.
+ */
+
+#include "rfb.h"
+#include "rfbregion.h"
+
+/* -=- Internal Span structure */
+
+struct sraRegion;
+
+typedef struct sraSpan {
+ struct sraSpan *_next;
+ struct sraSpan *_prev;
+ int start;
+ int end;
+ struct sraRegion *subspan;
+} sraSpan;
+
+typedef struct sraRegion {
+ sraSpan front;
+ sraSpan back;
+} sraSpanList;
+
+/* -=- Span routines */
+
+sraSpanList *sraSpanListDup(const sraSpanList *src);
+void sraSpanListDestroy(sraSpanList *list);
+
+sraSpan *
+sraSpanCreate(int start, int end, const sraSpanList *subspan) {
+ sraSpan *item = (sraSpan*)malloc(sizeof(sraSpan));
+ item->_next = item->_prev = NULL;
+ item->start = start;
+ item->end = end;
+ item->subspan = sraSpanListDup(subspan);
+ return item;
+}
+
+sraSpan *
+sraSpanDup(const sraSpan *src) {
+ sraSpan *span;
+ if (!src) return NULL;
+ span = sraSpanCreate(src->start, src->end, src->subspan);
+ return span;
+}
+
+void
+sraSpanInsertAfter(sraSpan *newspan, sraSpan *after) {
+ newspan->_next = after->_next;
+ newspan->_prev = after;
+ after->_next->_prev = newspan;
+ after->_next = newspan;
+}
+
+void
+sraSpanInsertBefore(sraSpan *newspan, sraSpan *before) {
+ newspan->_next = before;
+ newspan->_prev = before->_prev;
+ before->_prev->_next = newspan;
+ before->_prev = newspan;
+}
+
+void
+sraSpanRemove(sraSpan *span) {
+ span->_prev->_next = span->_next;
+ span->_next->_prev = span->_prev;
+}
+
+void
+sraSpanDestroy(sraSpan *span) {
+ if (span->subspan) sraSpanListDestroy(span->subspan);
+ free(span);
+}
+
+void
+sraSpanCheck(const sraSpan *span, const char *text) {
+ /* Check the span is valid! */
+ if (span->start == span->end) {
+ printf(text);
+ printf(":%d-%d\n", span->start, span->end);
+ exit(0);
+ }
+}
+
+/* -=- SpanList routines */
+
+void sraSpanPrint(const sraSpan *s);
+
+void
+sraSpanListPrint(const sraSpanList *l) {
+ sraSpan *curr;
+ if (!l) {
+ printf("NULL");
+ return;
+ }
+ curr = l->front._next;
+ printf("[");
+ while (curr != &(l->back)) {
+ sraSpanPrint(curr);
+ curr = curr->_next;
+ }
+ printf("]");
+}
+
+void
+sraSpanPrint(const sraSpan *s) {
+ printf("(%d-%d)", (s->start), (s->end));
+ if (s->subspan)
+ sraSpanListPrint(s->subspan);
+}
+
+sraSpanList *
+sraSpanListCreate() {
+ sraSpanList *item = (sraSpanList*)malloc(sizeof(sraSpanList));
+ item->front._next = &(item->back);
+ item->front._prev = NULL;
+ item->back._prev = &(item->front);
+ item->back._next = NULL;
+ return item;
+}
+
+sraSpanList *
+sraSpanListDup(const sraSpanList *src) {
+ sraSpanList *newlist;
+ sraSpan *newspan, *curr;
+
+ if (!src) return NULL;
+ newlist = sraSpanListCreate();
+ curr = src->front._next;
+ while (curr != &(src->back)) {
+ newspan = sraSpanDup(curr);
+ sraSpanInsertBefore(newspan, &(newlist->back));
+ curr = curr->_next;
+ }
+
+ return newlist;
+}
+
+void
+sraSpanListDestroy(sraSpanList *list) {
+ sraSpan *curr, *next;
+ while (list->front._next != &(list->back)) {
+ curr = list->front._next;
+ next = curr->_next;
+ sraSpanRemove(curr);
+ sraSpanDestroy(curr);
+ curr = next;
+ }
+ free(list);
+}
+
+void
+sraSpanListMakeEmpty(sraSpanList *list) {
+ sraSpan *curr, *next;
+ while (list->front._next != &(list->back)) {
+ curr = list->front._next;
+ next = curr->_next;
+ sraSpanRemove(curr);
+ sraSpanDestroy(curr);
+ curr = next;
+ }
+ list->front._next = &(list->back);
+ list->front._prev = NULL;
+ list->back._prev = &(list->front);
+ list->back._next = NULL;
+}
+
+Bool
+sraSpanListEqual(const sraSpanList *s1, const sraSpanList *s2) {
+ sraSpan *sp1, *sp2;
+
+ if (!s1) {
+ if (!s2) {
+ return 1;
+ } else {
+ printf("sraSpanListEqual:incompatible spans (only one NULL!)\n");
+ exit(1);
+ }
+ }
+
+ sp1 = s1->front._next;
+ sp2 = s2->front._next;
+ while ((sp1 != &(s1->back)) &&
+ (sp2 != &(s2->back))) {
+ if ((sp1->start != sp2->start) ||
+ (sp1->end != sp2->end) ||
+ (!sraSpanListEqual(sp1->subspan, sp2->subspan))) {
+ return 0;
+ }
+ sp1 = sp1->_next;
+ sp2 = sp2->_next;
+ }
+
+ if ((sp1 == &(s1->back)) && (sp2 == &(s2->back))) {
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+Bool
+sraSpanListEmpty(const sraSpanList *list) {
+ return (list->front._next == &(list->back));
+}
+
+unsigned long
+sraSpanListCount(const sraSpanList *list) {
+ sraSpan *curr = list->front._next;
+ unsigned long count = 0;
+ while (curr != &(list->back)) {
+ if (curr->subspan) {
+ count += sraSpanListCount(curr->subspan);
+ } else {
+ count += 1;
+ }
+ curr = curr->_next;
+ }
+ return count;
+}
+
+void
+sraSpanMergePrevious(sraSpan *dest) {
+ sraSpan *prev = dest->_prev;
+ while ((prev->end == dest->start) &&
+ (prev->_prev) &&
+ (sraSpanListEqual(prev->subspan, dest->subspan))) {
+ /*
+ printf("merge_prev:");
+ sraSpanPrint(prev);
+ printf(" & ");
+ sraSpanPrint(dest);
+ printf("\n");
+ */
+ dest->start = prev->start;
+ sraSpanRemove(prev);
+ sraSpanDestroy(prev);
+ prev = dest->_prev;
+ }
+}
+
+void
+sraSpanMergeNext(sraSpan *dest) {
+ sraSpan *next = dest->_next;
+ while ((next->start == dest->end) &&
+ (next->_next) &&
+ (sraSpanListEqual(next->subspan, dest->subspan))) {
+/*
+ printf("merge_next:");
+ sraSpanPrint(dest);
+ printf(" & ");
+ sraSpanPrint(next);
+ printf("\n");
+ */
+ dest->end = next->end;
+ sraSpanRemove(next);
+ sraSpanDestroy(next);
+ next = dest->_next;
+ }
+}
+
+void
+sraSpanListOr(sraSpanList *dest, const sraSpanList *src) {
+ sraSpan *d_curr, *s_curr;
+ int s_start, s_end;
+
+ if (!dest) {
+ if (!src) {
+ return;
+ } else {
+ printf("sraSpanListOr:incompatible spans (only one NULL!)\n");
+ exit(1);
+ }
+ }
+
+ d_curr = dest->front._next;
+ s_curr = src->front._next;
+ s_start = s_curr->start;
+ s_end = s_curr->end;
+ while (s_curr != &(src->back)) {
+
+ /* - If we are at end of destination list OR
+ If the new span comes before the next destination one */
+ if ((d_curr == &(dest->back)) ||
+ (d_curr->start >= s_end)) {
+ /* - Add the span */
+ sraSpanInsertBefore(sraSpanCreate(s_start, s_end,
+ s_curr->subspan),
+ d_curr);
+ if (d_curr != &(dest->back))
+ sraSpanMergePrevious(d_curr);
+ s_curr = s_curr->_next;
+ s_start = s_curr->start;
+ s_end = s_curr->end;
+ } else {
+
+ /* - If the new span overlaps the existing one */
+ if ((s_start < d_curr->end) &&
+ (s_end > d_curr->start)) {
+
+ /* - Insert new span before the existing destination one? */
+ if (s_start < d_curr->start) {
+ sraSpanInsertBefore(sraSpanCreate(s_start,
+ d_curr->start,
+ s_curr->subspan),
+ d_curr);
+ sraSpanMergePrevious(d_curr);
+ }
+
+ /* Split the existing span if necessary */
+ if (s_end < d_curr->end) {
+ sraSpanInsertAfter(sraSpanCreate(s_end,
+ d_curr->end,
+ d_curr->subspan),
+ d_curr);
+ d_curr->end = s_end;
+ }
+ if (s_start > d_curr->start) {
+ sraSpanInsertBefore(sraSpanCreate(d_curr->start,
+ s_start,
+ d_curr->subspan),
+ d_curr);
+ d_curr->start = s_start;
+ }
+
+ /* Recursively OR subspans */
+ sraSpanListOr(d_curr->subspan, s_curr->subspan);
+
+ /* Merge this span with previous or next? */
+ if (d_curr->_prev != &(dest->front))
+ sraSpanMergePrevious(d_curr);
+ if (d_curr->_next != &(dest->back))
+ sraSpanMergeNext(d_curr);
+
+ /* Move onto the next pair to compare */
+ if (s_end > d_curr->end) {
+ s_start = d_curr->end;
+ d_curr = d_curr->_next;
+ } else {
+ s_curr = s_curr->_next;
+ s_start = s_curr->start;
+ s_end = s_curr->end;
+ }
+ } else {
+ /* - No overlap. Move to the next destination span */
+ d_curr = d_curr->_next;
+ }
+ }
+ }
+}
+
+Bool
+sraSpanListAnd(sraSpanList *dest, const sraSpanList *src) {
+ sraSpan *d_curr, *s_curr, *d_next;
+
+ if (!dest) {
+ if (!src) {
+ return 1;
+ } else {
+ printf("sraSpanListAnd:incompatible spans (only one NULL!)\n");
+ exit(1);
+ }
+ }
+
+ d_curr = dest->front._next;
+ s_curr = src->front._next;
+ while ((s_curr != &(src->back)) && (d_curr != &(dest->back))) {
+
+ /* - If we haven't reached a destination span yet then move on */
+ if (d_curr->start >= s_curr->end) {
+ s_curr = s_curr->_next;
+ continue;
+ }
+
+ /* - If we are beyond the current destination span then remove it */
+ if (d_curr->end <= s_curr->start) {
+ sraSpan *next = d_curr->_next;
+ sraSpanRemove(d_curr);
+ sraSpanDestroy(d_curr);
+ d_curr = next;
+ continue;
+ }
+
+ /* - If we partially overlap a span then split it up or remove bits */
+ if (s_curr->start > d_curr->start) {
+ /* - The top bit of the span does not match */
+ d_curr->start = s_curr->start;
+ }
+ if (s_curr->end < d_curr->end) {
+ /* - The end of the span does not match */
+ sraSpanInsertAfter(sraSpanCreate(s_curr->end,
+ d_curr->end,
+ d_curr->subspan),
+ d_curr);
+ d_curr->end = s_curr->end;
+ }
+
+ /* - Now recursively process the affected span */
+ if (!sraSpanListAnd(d_curr->subspan, s_curr->subspan)) {
+ /* - The destination subspan is now empty, so we should remove it */
+ sraSpan *next = d_curr->_next;
+ sraSpanRemove(d_curr);
+ sraSpanDestroy(d_curr);
+ d_curr = next;
+ } else {
+ /* Merge this span with previous or next? */
+ if (d_curr->_prev != &(dest->front))
+ sraSpanMergePrevious(d_curr);
+
+ /* - Move on to the next span */
+ d_next = d_curr;
+ if (s_curr->end >= d_curr->end) {
+ d_next = d_curr->_next;
+ }
+ if (s_curr->end <= d_curr->end) {
+ s_curr = s_curr->_next;
+ }
+ d_curr = d_next;
+ }
+ }
+
+ while (d_curr != &(dest->back)) {
+ sraSpan *next = d_curr->_next;
+ sraSpanRemove(d_curr);
+ sraSpanDestroy(d_curr);
+ d_curr=next;
+ }
+
+ return !sraSpanListEmpty(dest);
+}
+
+Bool
+sraSpanListSubtract(sraSpanList *dest, const sraSpanList *src) {
+ sraSpan *d_curr, *s_curr;
+
+ if (!dest) {
+ if (!src) {
+ return 1;
+ } else {
+ printf("sraSpanListSubtract:incompatible spans (only one NULL!)\n");
+ exit(1);
+ }
+ }
+
+ d_curr = dest->front._next;
+ s_curr = src->front._next;
+ while ((s_curr != &(src->back)) && (d_curr != &(dest->back))) {
+
+ /* - If we haven't reached a destination span yet then move on */
+ if (d_curr->start >= s_curr->end) {
+ s_curr = s_curr->_next;
+ continue;
+ }
+
+ /* - If we are beyond the current destination span then skip it */
+ if (d_curr->end <= s_curr->start) {
+ d_curr = d_curr->_next;
+ continue;
+ }
+
+ /* - If we partially overlap the current span then split it up */
+ if (s_curr->start > d_curr->start) {
+ sraSpanInsertBefore(sraSpanCreate(d_curr->start,
+ s_curr->start,
+ d_curr->subspan),
+ d_curr);
+ d_curr->start = s_curr->start;
+ }
+ if (s_curr->end < d_curr->end) {
+ sraSpanInsertAfter(sraSpanCreate(s_curr->end,
+ d_curr->end,
+ d_curr->subspan),
+ d_curr);
+ d_curr->end = s_curr->end;
+ }
+
+ /* - Now recursively process the affected span */
+ if ((!d_curr->subspan) || !sraSpanListSubtract(d_curr->subspan, s_curr->subspan)) {
+ /* - The destination subspan is now empty, so we should remove it */
+ sraSpan *next = d_curr->_next;
+ sraSpanRemove(d_curr);
+ sraSpanDestroy(d_curr);
+ d_curr = next;
+ } else {
+ /* Merge this span with previous or next? */
+ if (d_curr->_prev != &(dest->front))
+ sraSpanMergePrevious(d_curr);
+ if (d_curr->_next != &(dest->back))
+ sraSpanMergeNext(d_curr);
+
+ /* - Move on to the next span */
+ if (s_curr->end > d_curr->end) {
+ d_curr = d_curr->_next;
+ } else {
+ s_curr = s_curr->_next;
+ }
+ }
+ }
+
+ return !sraSpanListEmpty(dest);
+}
+
+/* -=- Region routines */
+
+sraRegion *
+sraRgnCreate() {
+ return (sraRegion*)sraSpanListCreate();
+}
+
+sraRegion *
+sraRgnCreateRect(int x1, int y1, int x2, int y2) {
+ sraSpanList *vlist, *hlist;
+ sraSpan *vspan, *hspan;
+
+ /* - Build the horizontal portion of the span */
+ hlist = sraSpanListCreate();
+ hspan = sraSpanCreate(x1, x2, NULL);
+ sraSpanInsertAfter(hspan, &(hlist->front));
+
+ /* - Build the vertical portion of the span */
+ vlist = sraSpanListCreate();
+ vspan = sraSpanCreate(y1, y2, hlist);
+ sraSpanInsertAfter(vspan, &(vlist->front));
+
+ sraSpanListDestroy(hlist);
+
+ return (sraRegion*)vlist;
+}
+
+sraRegion *
+sraRgnCreateRgn(const sraRegion *src) {
+ return (sraRegion*)sraSpanListDup((sraSpanList*)src);
+}
+
+void
+sraRgnDestroy(sraRegion *rgn) {
+ sraSpanListDestroy((sraSpanList*)rgn);
+}
+
+void
+sraRgnMakeEmpty(sraRegion *rgn) {
+ sraSpanListMakeEmpty((sraSpanList*)rgn);
+}
+
+/* -=- Boolean Region ops */
+
+Bool
+sraRgnAnd(sraRegion *dst, const sraRegion *src) {
+ return sraSpanListAnd((sraSpanList*)dst, (sraSpanList*)src);
+}
+
+void
+sraRgnOr(sraRegion *dst, const sraRegion *src) {
+ sraSpanListOr((sraSpanList*)dst, (sraSpanList*)src);
+}
+
+Bool
+sraRgnSubtract(sraRegion *dst, const sraRegion *src) {
+ return sraSpanListSubtract((sraSpanList*)dst, (sraSpanList*)src);
+}
+
+void
+sraRgnOffset(sraRegion *dst, int dx, int dy) {
+ sraSpan *vcurr, *hcurr;
+
+ vcurr = ((sraSpanList*)dst)->front._next;
+ while (vcurr != &(((sraSpanList*)dst)->back)) {
+ vcurr->start += dy;
+ vcurr->end += dy;
+
+ hcurr = vcurr->subspan->front._next;
+ while (hcurr != &(vcurr->subspan->back)) {
+ hcurr->start += dx;
+ hcurr->end += dx;
+ hcurr = hcurr->_next;
+ }
+
+ vcurr = vcurr->_next;
+ }
+}
+
+Bool
+sraRgnPopRect(sraRegion *rgn, sraRect *rect, unsigned long flags) {
+ sraSpan *vcurr, *hcurr;
+ sraSpan *vend, *hend;
+ Bool right2left = flags & 2;
+ Bool bottom2top = flags & 1;
+
+ /* - Pick correct order */
+ if (bottom2top) {
+ vcurr = ((sraSpanList*)rgn)->back._prev;
+ vend = &(((sraSpanList*)rgn)->front);
+ } else {
+ vcurr = ((sraSpanList*)rgn)->front._next;
+ vend = &(((sraSpanList*)rgn)->back);
+ }
+
+ if (vcurr != vend) {
+ rect->y1 = vcurr->start;
+ rect->y2 = vcurr->end;
+
+ /* - Pick correct order */
+ if (right2left) {
+ hcurr = vcurr->subspan->back._prev;
+ hend = &(vcurr->subspan->front);
+ } else {
+ hcurr = vcurr->subspan->front._next;
+ hend = &(vcurr->subspan->back);
+ }
+
+ if (hcurr != hend) {
+ rect->x1 = hcurr->start;
+ rect->x2 = hcurr->end;
+
+ sraSpanRemove(hcurr);
+ sraSpanDestroy(hcurr);
+
+ if (sraSpanListEmpty(vcurr->subspan)) {
+ sraSpanRemove(vcurr);
+ sraSpanDestroy(vcurr);
+ }
+
+#if 0
+ printf("poprect:(%dx%d)-(%dx%d)\n",
+ rect->x1, rect->y1, rect->x2, rect->y2);
+#endif
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+unsigned long
+sraRgnCountRects(const sraRegion *rgn) {
+ unsigned long count = sraSpanListCount((sraSpanList*)rgn);
+ return count;
+}
+
+Bool
+sraRgnEmpty(const sraRegion *rgn) {
+ return sraSpanListEmpty((sraSpanList*)rgn);
+}
+
+/* iterator stuff */
+sraRectangleIterator *sraRgnGetIterator(sraRegion *s)
+{
+ /* these values have to be multiples of 4 */
+#define DEFSIZE 4
+#define DEFSTEP 8
+ sraRectangleIterator *i =
+ (sraRectangleIterator*)malloc(sizeof(sraRectangleIterator));
+ if(!i)
+ return(0);
+
+ /* we have to recurse eventually. So, the first sPtr is the pointer to
+ the sraSpan in the first level. the second sPtr is the pointer to
+ the sraRegion.back. The third and fourth sPtr are for the second
+ recursion level and so on. */
+ i->sPtrs = (sraSpan**)malloc(sizeof(sraSpan*)*DEFSIZE);
+ if(!i->sPtrs) {
+ free(i);
+ return(0);
+ }
+ i->ptrSize = DEFSIZE;
+ i->sPtrs[0] = &(s->front);
+ i->sPtrs[1] = &(s->back);
+ i->ptrPos = 0;
+ i->reverseX = 0;
+ i->reverseY = 0;
+ return(i);
+}
+
+sraRectangleIterator *sraRgnGetReverseIterator(sraRegion *s,Bool reverseX,Bool reverseY)
+{
+ sraRectangleIterator *i = sraRgnGetIterator(s);
+ if(reverseY) {
+ i->sPtrs[1] = &(s->front);
+ i->sPtrs[0] = &(s->back);
+ }
+ i->reverseX = reverseX;
+ i->reverseY = reverseY;
+ return(i);
+}
+
+Bool sraReverse(sraRectangleIterator *i)
+{
+ return( ((i->ptrPos&2) && i->reverseX) ||
+ (!(i->ptrPos&2) && i->reverseY));
+}
+
+sraSpan* sraNextSpan(sraRectangleIterator *i)
+{
+ if(sraReverse(i))
+ return(i->sPtrs[i->ptrPos]->_prev);
+ else
+ return(i->sPtrs[i->ptrPos]->_next);
+}
+
+Bool sraRgnIteratorNext(sraRectangleIterator* i,sraRect* r)
+{
+ /* is the subspan finished? */
+ while(sraNextSpan(i) == i->sPtrs[i->ptrPos+1]) {
+ i->ptrPos -= 2;
+ if(i->ptrPos < 0) /* the end */
+ return(0);
+ }
+
+ i->sPtrs[i->ptrPos] = sraNextSpan(i);
+
+ /* is this a new subspan? */
+ while(i->sPtrs[i->ptrPos]->subspan) {
+ if(i->ptrPos+2 > i->ptrSize) { /* array is too small */
+ i->ptrSize += DEFSTEP;
+ i->sPtrs = (sraSpan**)realloc(i->sPtrs, sizeof(sraSpan*)*i->ptrSize);
+ }
+ i->ptrPos =+ 2;
+ if(sraReverse(i)) {
+ i->sPtrs[i->ptrPos] = i->sPtrs[i->ptrPos-2]->subspan->back._prev;
+ i->sPtrs[i->ptrPos+1] = &(i->sPtrs[i->ptrPos-2]->subspan->front);
+ } else {
+ i->sPtrs[i->ptrPos] = i->sPtrs[i->ptrPos-2]->subspan->front._next;
+ i->sPtrs[i->ptrPos+1] = &(i->sPtrs[i->ptrPos-2]->subspan->back);
+ }
+ }
+
+ if((i->ptrPos%4)!=2) {
+ fprintf(stderr,"sraRgnIteratorNext: offset is wrong (%d%%4!=2)\n",i->ptrPos);
+ exit(-1);
+ }
+
+ r->y1 = i->sPtrs[i->ptrPos-2]->start;
+ r->y2 = i->sPtrs[i->ptrPos-2]->end;
+ r->x1 = i->sPtrs[i->ptrPos]->start;
+ r->x2 = i->sPtrs[i->ptrPos]->end;
+
+ return(-1);
+}
+
+void sraRgnReleaseIterator(sraRectangleIterator* i)
+{
+ free(i->sPtrs);
+ free(i);
+}
+
+void
+sraRgnPrint(const sraRegion *rgn) {
+ sraSpanListPrint((sraSpanList*)rgn);
+}
+
+Bool
+sraClipRect(int *x, int *y, int *w, int *h,
+ int cx, int cy, int cw, int ch) {
+ if (*x < cx) {
+ *w -= (cx-*x);
+ *x = cx;
+ }
+ if (*y < cy) {
+ *h -= (cy-*y);
+ *y = cy;
+ }
+ if (*x+*w > cx+cw) {
+ *w = (cx+cw)-*x;
+ }
+ if (*y+*h > cy+ch) {
+ *h = (cy+ch)-*y;
+ }
+ return (*w>0) && (*h>0);
+}
+
+/* test */
+
+#ifdef SRA_TEST
+/* pipe the output to sort|uniq -u and you'll get the errors. */
+int main(int argc, char** argv)
+{
+ sraRegionPtr region, region1, region2;
+ sraRectangleIterator* i;
+ sraRect rect;
+ Bool b;
+
+ region = sraRgnCreateRect(10, 10, 600, 300);
+ region1 = sraRgnCreateRect(40, 50, 350, 200);
+ region2 = sraRgnCreateRect(0, 0, 20, 40);
+
+ sraRgnPrint(region);
+ printf("\n[(10-300)[(10-600)]]\n\n");
+
+ b = sraRgnSubtract(region, region1);
+ printf("%s ",b?"true":"false");
+ sraRgnPrint(region);
+ printf("\ntrue [(10-50)[(10-600)](50-200)[(10-40)(350-600)](200-300)[(10-600)]]\n\n");
+
+ sraRgnOr(region, region2);
+ printf("%ld\n6\n\n", sraRgnCountRects(region));
+
+ i = sraRgnGetIterator(region);
+ while(sraRgnIteratorNext(i, &rect))
+ printf("%dx%d+%d+%d ",
+ rect.x2-rect.x1,rect.y2-rect.y1,
+ rect.x1,rect.y1);
+ sraRgnReleaseIterator(i);
+ printf("\n20x10+0+0 600x30+0+10 590x10+10+40 30x150+10+50 250x150+350+50 590x100+10+200\n\n");
+
+ i = sraRgnGetReverseIterator(region,1,0);
+ while(sraRgnIteratorNext(i, &rect))
+ printf("%dx%d+%d+%d ",
+ rect.x2-rect.x1,rect.y2-rect.y1,
+ rect.x1,rect.y1);
+ sraRgnReleaseIterator(i);
+ printf("\n20x10+0+0 600x30+0+10 590x10+10+40 250x150+350+50 30x150+10+50 590x100+10+200\n\n");
+
+ i = sraRgnGetReverseIterator(region,1,1);
+ while(sraRgnIteratorNext(i, &rect))
+ printf("%dx%d+%d+%d ",
+ rect.x2-rect.x1,rect.y2-rect.y1,
+ rect.x1,rect.y1);
+ sraRgnReleaseIterator(i);
+ printf("\n590x100+10+200 250x150+350+50 30x150+10+50 590x10+10+40 600x30+0+10 20x10+0+0\n\n");
+
+ return(0);
+}
+#endif
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