From a761caf07978681398271b3ef3333d1a21443a39 Mon Sep 17 00:00:00 2001
From: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
Date: Tue, 8 Sep 2020 20:16:26 -0300
Subject: [PATCH] cogl/matrix: Add cogl_matrix_init_from_matrix initializer

It does a simple memcpy() to clone the entire structure. This will
be necessary for a smoother removal of ClutterMatrix.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1439
---
 cogl/cogl/cogl-matrix.c |  7 +++++++
 cogl/cogl/cogl-matrix.h | 11 +++++++++++
 2 files changed, 18 insertions(+)

diff --git a/cogl/cogl/cogl-matrix.c b/cogl/cogl/cogl-matrix.c
index 695887a70..7bd2af0b0 100644
--- a/cogl/cogl/cogl-matrix.c
+++ b/cogl/cogl/cogl-matrix.c
@@ -1700,6 +1700,13 @@ cogl_matrix_init_from_array (CoglMatrix *matrix, const float *array)
   _COGL_MATRIX_DEBUG_PRINT (matrix);
 }
 
+void
+cogl_matrix_init_from_matrix (CoglMatrix       *matrix,
+                              const CoglMatrix *source)
+{
+  memcpy (matrix, source, sizeof (CoglMatrix));
+}
+
 void
 _cogl_matrix_init_from_matrix_without_inverse (CoglMatrix *matrix,
                                                const CoglMatrix *src)
diff --git a/cogl/cogl/cogl-matrix.h b/cogl/cogl/cogl-matrix.h
index 5e0a5498e..2cfd95bbb 100644
--- a/cogl/cogl/cogl-matrix.h
+++ b/cogl/cogl/cogl-matrix.h
@@ -463,6 +463,17 @@ COGL_EXPORT void
 cogl_matrix_init_from_array (CoglMatrix *matrix,
                              const float *array);
 
+/**
+ * cogl_matrix_init_from_matrix:
+ * @matrix: A 4x4 transformation matrix
+ * @source: the #CoglMatrix to copy
+ *
+ * Initializes @matrix with the contents of @source
+ */
+COGL_EXPORT void
+cogl_matrix_init_from_matrix (CoglMatrix       *matrix,
+                              const CoglMatrix *source);
+
 /**
  * cogl_matrix_get_array:
  * @matrix: A 4x4 transformation matrix