Merge commit '075acbb6ff'

* commit '075acbb6ff':
  lavu: Add a video section to Doxygen documentation

Merged-by: James Almer <jamrial@gmail.com>

libavutil/display.h

@@ -18,6 +18,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/**
+ * @file
+ * Display matrix
+ */
+
 #ifndef AVUTIL_DISPLAY_H
 #define AVUTIL_DISPLAY_H
 
@@ -25,15 +30,26 @@
 #include "common.h"
 
 /**
+ * @addtogroup lavu_video
+ * @{
+ *
+ * @defgroup lavu_video_display Display transformation matrix functions
+ * @{
+ */
+
+/**
+ * @addtogroup lavu_video_display
  * The display transformation matrix specifies an affine transformation that
  * should be applied to video frames for correct presentation. It is compatible
  * with the matrices stored in the ISO/IEC 14496-12 container format.
  *
  * The data is a 3x3 matrix represented as a 9-element array:
  *
+ * @code{.unparsed}
  *                                  | a b u |
  *   (a, b, u, c, d, v, x, y, w) -> | c d v |
  *                                  | x y w |
+ * @endcode
  *
  * All numbers are stored in native endianness, as 16.16 fixed-point values,
  * except for u, v and w, which are stored as 2.30 fixed-point values.
@@ -41,15 +57,21 @@
  * The transformation maps a point (p, q) in the source (pre-transformation)
  * frame to the point (p', q') in the destination (post-transformation) frame as
  * follows:
+ *
+ * @code{.unparsed}
  *               | a b u |
  *   (p, q, 1) . | c d v | = z * (p', q', 1)
  *               | x y w |
+ * @endcode
  *
  * The transformation can also be more explicitly written in components as
  * follows:
+ *
+ * @code{.unparsed}
  *   p' = (a * p + c * q + x) / z;
  *   q' = (b * p + d * q + y) / z;
  *   z  =  u * p + v * q + w
+ * @endcode
  */
 
 /**
@@ -84,4 +106,9 @@ void av_display_rotation_set(int32_t matrix[9], double angle);
  */
 void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip);
 
+/**
+ * @}
+ * @}
+ */
+
 #endif /* AVUTIL_DISPLAY_H */