[RFC PATCH v4 27/42] drm/colorop: define a new macro for_each_new_colorop_in_state

[Harry Wentland]

From: Alex Hung <alex.hung at amd.com>

Create a new macro for_each_new_colorop_in_state to access new
drm_colorop_state updated from uapi.

Signed-off-by: Alex Hung <alex.hung at amd.com>
---
 include/drm/drm_atomic.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 61e6b5553eec..a4c5ff99a515 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -979,6 +979,26 @@ void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
 			      (new_colorop_state) = (__state)->colorops[__i].new_state, 1))
 
 
+/**
+ * for_each_new_colorop_in_state - iterate over all colorops in an atomic update
+ * @__state: &struct drm_atomic_state pointer
+ * @colorop: &struct drm_colorop iteration cursor
+ * @new_colorop_state: &struct drm_colorop_state iteration cursor for the new state
+ * @__i: int iteration cursor, for macro-internal use
+ *
+ * This iterates over all colorops in an atomic update, tracking new state. This is
+ * useful is useful in places where the state delta needs to be considered, for
+ * example in atomic check functions.
+ */
+#define for_each_new_colorop_in_state(__state, colorop, new_colorop_state, __i) \
+	for ((__i) = 0;							\
+	     (__i) < (__state)->dev->mode_config.num_colorop;	\
+	     (__i)++)							\
+		for_each_if ((__state)->colorops[__i].ptr &&		\
+			     ((colorop) = (__state)->colorops[__i].ptr,	\
+			      (void)(colorop) /* Only to avoid unused-but-set-variable warning */, \
+			      (new_colorop_state) = (__state)->colorops[__i].new_state, 1))
+
 /**
  * for_each_oldnew_plane_in_state - iterate over all planes in an atomic update
  * @__state: &struct drm_atomic_state pointer
-- 
2.44.0