- curBand = newReg->numRects;
-
- /*
- * This algorithm proceeds one source-band (as opposed to a
- * destination band, which is determined by where the two regions
- * intersect) at a time. r1BandEnd and r2BandEnd serve to mark the
- * rectangle after the last one in the current band for their
- * respective regions.
- */
- r1BandEnd = r1;
- while ((r1BandEnd != r1End) && (r1BandEnd->y1 == r1->y1))
- {
- r1BandEnd++;
- }
-
- r2BandEnd = r2;
- while ((r2BandEnd != r2End) && (r2BandEnd->y1 == r2->y1))
- {
- r2BandEnd++;
- }
-
- /*
- * First handle the band that doesn't intersect, if any.
- *
- * Note that attention is restricted to one band in the
- * non-intersecting region at once, so if a region has n
- * bands between the current position and the next place it overlaps
- * the other, this entire loop will be passed through n times.
- */
- if (r1->y1 < r2->y1)
- {
- top = wxMax(r1->y1,ybot);
- bot = wxMin(r1->y2,r2->y1);
-
- if ((top != bot) && (nonOverlap1Func != NULL))
- {
- (* nonOverlap1Func) (newReg, r1, r1BandEnd, top, bot);
- }
-
- ytop = r2->y1;
- }
- else if (r2->y1 < r1->y1)
- {
- top = wxMax(r2->y1,ybot);
- bot = wxMin(r2->y2,r1->y1);
-
- if ((top != bot) && (nonOverlap2Func != NULL))
- {
- (* nonOverlap2Func) (newReg, r2, r2BandEnd, top, bot);
- }
-
- ytop = r1->y1;
- }
- else
- {
- ytop = r1->y1;
- }
-
- /*
- * If any rectangles got added to the region, try and coalesce them
- * with rectangles from the previous band. Note we could just do
- * this test in miCoalesce, but some machines incur a not
- * inconsiderable cost for function calls, so...
- */
- if (newReg->numRects != curBand)
- {
- prevBand = miCoalesce (newReg, prevBand, curBand);
- }
-
- /*
- * Now see if we've hit an intersecting band. The two bands only
- * intersect if ybot > ytop
- */
- ybot = wxMin(r1->y2, r2->y2);
- curBand = newReg->numRects;
- if (ybot > ytop)
- {
- (* overlapFunc) (newReg, r1, r1BandEnd, r2, r2BandEnd, ytop, ybot);
-
- }
-
- if (newReg->numRects != curBand)
- {
- prevBand = miCoalesce (newReg, prevBand, curBand);
- }
-
- /*
- * If we've finished with a band (y2 == ybot) we skip forward
- * in the region to the next band.
- */
- if (r1->y2 == ybot)
- {
- r1 = r1BandEnd;
- }
- if (r2->y2 == ybot)
- {
- r2 = r2BandEnd;
- }
+ curBand = newReg->numRects;
+
+ /*
+ * This algorithm proceeds one source-band (as opposed to a
+ * destination band, which is determined by where the two regions
+ * intersect) at a time. r1BandEnd and r2BandEnd serve to mark the
+ * rectangle after the last one in the current band for their
+ * respective regions.
+ */
+ r1BandEnd = r1;
+ while ((r1BandEnd != r1End) && (r1BandEnd->y1 == r1->y1))
+ {
+ r1BandEnd++;
+ }
+
+ r2BandEnd = r2;
+ while ((r2BandEnd != r2End) && (r2BandEnd->y1 == r2->y1))
+ {
+ r2BandEnd++;
+ }
+
+ /*
+ * First handle the band that doesn't intersect, if any.
+ *
+ * Note that attention is restricted to one band in the
+ * non-intersecting region at once, so if a region has n
+ * bands between the current position and the next place it overlaps
+ * the other, this entire loop will be passed through n times.
+ */
+ if (r1->y1 < r2->y1)
+ {
+ top = wxMax(r1->y1,ybot);
+ bot = wxMin(r1->y2,r2->y1);
+
+ if ((top != bot) && (nonOverlap1Func != NULL))
+ {
+ (* nonOverlap1Func) (newReg, r1, r1BandEnd, top, bot);
+ }
+
+ ytop = r2->y1;
+ }
+ else if (r2->y1 < r1->y1)
+ {
+ top = wxMax(r2->y1,ybot);
+ bot = wxMin(r2->y2,r1->y1);
+
+ if ((top != bot) && (nonOverlap2Func != NULL))
+ {
+ (* nonOverlap2Func) (newReg, r2, r2BandEnd, top, bot);
+ }
+
+ ytop = r1->y1;
+ }
+ else
+ {
+ ytop = r1->y1;
+ }
+
+ /*
+ * If any rectangles got added to the region, try and coalesce them
+ * with rectangles from the previous band. Note we could just do
+ * this test in miCoalesce, but some machines incur a not
+ * inconsiderable cost for function calls, so...
+ */
+ if (newReg->numRects != curBand)
+ {
+ prevBand = miCoalesce (newReg, prevBand, curBand);
+ }
+
+ /*
+ * Now see if we've hit an intersecting band. The two bands only
+ * intersect if ybot > ytop
+ */
+ ybot = wxMin(r1->y2, r2->y2);
+ curBand = newReg->numRects;
+ if (ybot > ytop)
+ {
+ (* overlapFunc) (newReg, r1, r1BandEnd, r2, r2BandEnd, ytop, ybot);
+
+ }
+
+ if (newReg->numRects != curBand)
+ {
+ prevBand = miCoalesce (newReg, prevBand, curBand);
+ }
+
+ /*
+ * If we've finished with a band (y2 == ybot) we skip forward
+ * in the region to the next band.
+ */
+ if (r1->y2 == ybot)
+ {
+ r1 = r1BandEnd;
+ }
+ if (r2->y2 == ybot)
+ {
+ r2 = r2BandEnd;
+ }
projects / wxWidgets.git / blobdiff