gallium/util: implement util_format_is_yuv

This adds a helper to check if a pipe format is in YUV color space.
Drivers want to know about this, as YUV mostly needs special handling.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 88bfd72d0538c5ad10ae7bde1e6d276079ed6ec3..e497b4b3375a577710098b1fbc2bc2032d255aec 100644 (file)
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -557,6 +557,18 @@ util_format_is_depth_and_stencil(enum pipe_format format)
           util_format_has_stencil(desc);
 }
 
+static inline boolean
+util_format_is_yuv(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   assert(desc);
+   if (!desc) {
+      return FALSE;
+   }
+
+   return desc->colorspace == UTIL_FORMAT_COLORSPACE_YUV;
+}
 
 /**
  * Calculates the depth format type based upon the incoming format description.