1 files changed, 49 insertions, 2 deletions

diff --git a/include/drm/drm_rect.h b/include/drm/drm_rect.h
index e7f4d24cdd00..46f09cf68458 100644
--- a/include/drm/drm_rect.h
+++ b/include/drm/drm_rect.h
@@ -39,12 +39,31 @@
  * @x2: horizontal ending coordinate (exclusive)
  * @y1: vertical starting coordinate (inclusive)
  * @y2: vertical ending coordinate (exclusive)
+ *
+ * Note that this must match the layout of struct drm_mode_rect or the damage
+ * helpers like drm_atomic_helper_damage_iter_init() break.
  */
 struct drm_rect {
 	int x1, y1, x2, y2;
 };
 
 /**
+ * DRM_RECT_INIT - initialize a rectangle from x/y/w/h
+ * @x: x coordinate
+ * @y: y coordinate
+ * @w: width
+ * @h: height
+ *
+ * RETURNS:
+ * A new rectangle of the specified size.
+ */
+#define DRM_RECT_INIT(x, y, w, h) ((struct drm_rect){ \
+		.x1 = (x), \
+		.y1 = (y), \
+		.x2 = (x) + (w), \
+		.y2 = (y) + (h) })
+
+/**
  * DRM_RECT_FMT - printf string for &struct drm_rect
  */
 #define DRM_RECT_FMT    "%dx%d%+d%+d"
@@ -110,7 +129,7 @@ static inline void drm_rect_adjust_size(struct drm_rect *r, int dw, int dh)
 
 /**
  * drm_rect_translate - translate the rectangle
- * @r: rectangle to be tranlated
+ * @r: rectangle to be translated
  * @dx: horizontal translation
  * @dy: vertical translation
  *
@@ -127,7 +146,7 @@ static inline void drm_rect_translate(struct drm_rect *r, int dx, int dy)
 
 /**
  * drm_rect_translate_to - translate the rectangle to an absolute position
- * @r: rectangle to be tranlated
+ * @r: rectangle to be translated
  * @x: horizontal position
  * @y: vertical position
  *
@@ -206,6 +225,34 @@ static inline bool drm_rect_equals(const struct drm_rect *r1,
 		r1->y1 == r2->y1 && r1->y2 == r2->y2;
 }
 
+/**
+ * drm_rect_fp_to_int - Convert a rect in 16.16 fixed point form to int form.
+ * @dst: rect to be stored the converted value
+ * @src: rect in 16.16 fixed point form
+ */
+static inline void drm_rect_fp_to_int(struct drm_rect *dst,
+				      const struct drm_rect *src)
+{
+	drm_rect_init(dst, src->x1 >> 16, src->y1 >> 16,
+		      drm_rect_width(src) >> 16,
+		      drm_rect_height(src) >> 16);
+}
+
+/**
+ * drm_rect_overlap - Check if two rectangles overlap
+ * @a: first rectangle
+ * @b: second rectangle
+ *
+ * RETURNS:
+ * %true if the rectangles overlap, %false otherwise.
+ */
+static inline bool drm_rect_overlap(const struct drm_rect *a,
+				    const struct drm_rect *b)
+{
+	return (a->x2 > b->x1 && b->x2 > a->x1 &&
+		a->y2 > b->y1 && b->y2 > a->y1);
+}
+
 bool drm_rect_intersect(struct drm_rect *r, const struct drm_rect *clip);
 bool drm_rect_clip_scaled(struct drm_rect *src, struct drm_rect *dst,
 			  const struct drm_rect *clip);