region.h: helper functions for converting rect types

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/region.h

@@ -1,4 +1,5 @@
 #pragma once
+#include <xcb/xcb.h>
 #include <pixman.h>
 #include <stdio.h>
 #include "utils.h"
@@ -23,3 +24,24 @@ dump_region(const region_t *x) {
   for (int i = 0; i < nrects; i++)
     fprintf(stderr, "(%d, %d) - (%d, %d)\n", rects[i].x1, rects[i].y1, rects[i].x2, rects[i].y2);
 }
+
+/// Convert one xcb rectangle to our rectangle type
+static inline rect_t
+from_x_rect(const xcb_rectangle_t *rect) {
+  return (rect_t) {
+    .x1 = rect->x,
+    .y1 = rect->y,
+    .x2 = rect->x + rect->width,
+    .y2 = rect->y + rect->height,
+  };
+}
+
+/// Convert an array of xcb rectangles to our rectangle type
+/// Returning an array that needs to be freed
+static inline rect_t *
+from_x_rects(int nrects, const xcb_rectangle_t *rects) {
+  rect_t *ret = calloc(nrects, sizeof *ret);
+  for (int i = 0; i < nrects; i++)
+    ret[i] = from_x_rect(rects+i);
+  return ret;
+}