Snapshot of libvterm library.
Change-Id: Ic9b0f76021b7800d53052192cb9bbe5d77d82043
diff --git a/src/rect.h b/src/rect.h
new file mode 100644
index 0000000..2114f24
--- /dev/null
+++ b/src/rect.h
@@ -0,0 +1,56 @@
+/*
+ * Some utility functions on VTermRect structures
+ */
+
+#define STRFrect "(%d,%d-%d,%d)"
+#define ARGSrect(r) (r).start_row, (r).start_col, (r).end_row, (r).end_col
+
+/* Expand dst to contain src as well */
+static void rect_expand(VTermRect *dst, VTermRect *src)
+{
+ if(dst->start_row > src->start_row) dst->start_row = src->start_row;
+ if(dst->start_col > src->start_col) dst->start_col = src->start_col;
+ if(dst->end_row < src->end_row) dst->end_row = src->end_row;
+ if(dst->end_col < src->end_col) dst->end_col = src->end_col;
+}
+
+/* Clip the dst to ensure it does not step outside of bounds */
+static void rect_clip(VTermRect *dst, VTermRect *bounds)
+{
+ if(dst->start_row < bounds->start_row) dst->start_row = bounds->start_row;
+ if(dst->start_col < bounds->start_col) dst->start_col = bounds->start_col;
+ if(dst->end_row > bounds->end_row) dst->end_row = bounds->end_row;
+ if(dst->end_col > bounds->end_col) dst->end_col = bounds->end_col;
+ /* Ensure it doesn't end up negatively-sized */
+ if(dst->end_row < dst->start_row) dst->end_row = dst->start_row;
+ if(dst->end_col < dst->start_col) dst->end_col = dst->start_col;
+}
+
+/* True if the two rectangles are equal */
+static int rect_equal(VTermRect *a, VTermRect *b)
+{
+ return (a->start_row == b->start_row) &&
+ (a->start_col == b->start_col) &&
+ (a->end_row == b->end_row) &&
+ (a->end_col == b->end_col);
+}
+
+/* True if small is contained entirely within big */
+static int rect_contains(VTermRect *big, VTermRect *small)
+{
+ if(small->start_row < big->start_row) return 0;
+ if(small->start_col < big->start_col) return 0;
+ if(small->end_row > big->end_row) return 0;
+ if(small->end_col > big->end_col) return 0;
+ return 1;
+}
+
+/* True if the rectangles overlap at all */
+static int rect_intersects(VTermRect *a, VTermRect *b)
+{
+ if(a->start_row > b->end_row || b->start_row > a->end_row)
+ return 0;
+ if(a->start_col > b->end_col || b->start_col > a->end_col)
+ return 0;
+ return 1;
+}