[gimp] libgimpmath: add a boxed type and a GParamSpec for GimpMatrix3

[Michael Natterer <mitch src gnome org>]

commit 1e11a279b2edbc0f02e561f47d0347351b2ff5d9
Author: Michael Natterer <mitch gimp org>
Date:   Sun Mar 27 21:13:31 2011 +0200

    libgimpmath: add a boxed type and a GParamSpec for GimpMatrix3

 libgimpmath/gimpmath.def |    3 +
 libgimpmath/gimpmatrix.c |  177 ++++++++++++++++++++++++++++++++++++++++++++++
 libgimpmath/gimpmatrix.h |   33 +++++++++
 3 files changed, 213 insertions(+), 0 deletions(-)
---
diff --git a/libgimpmath/gimpmath.def b/libgimpmath/gimpmath.def
index 1aeea16..1a48940 100644
--- a/libgimpmath/gimpmath.def
+++ b/libgimpmath/gimpmath.def
@@ -4,6 +4,7 @@ EXPORTS
 	gimp_matrix2_mult
 	gimp_matrix3_affine
 	gimp_matrix3_determinant
+	gimp_matrix3_get_type
 	gimp_matrix3_identity
 	gimp_matrix3_invert
 	gimp_matrix3_is_affine
@@ -20,7 +21,9 @@ EXPORTS
 	gimp_matrix4_to_deg
 	gimp_md5_get_digest
 	gimp_param_matrix2_get_type
+	gimp_param_matrix3_get_type
 	gimp_param_spec_matrix2
+	gimp_param_spec_matrix3
 	gimp_vector2_add
 	gimp_vector2_add_val
 	gimp_vector2_cross_product
diff --git a/libgimpmath/gimpmatrix.c b/libgimpmath/gimpmatrix.c
index 9b8224a..594cdd3 100644
--- a/libgimpmath/gimpmatrix.c
+++ b/libgimpmath/gimpmatrix.c
@@ -264,6 +264,183 @@ gimp_matrix2_mult (const GimpMatrix2 *matrix1,
   *matrix2 = tmp;
 }
 
+
+static GimpMatrix3 * matrix3_copy                  (const GimpMatrix3 *matrix);
+
+/**
+ * gimp_matrix3_get_type:
+ *
+ * Reveals the object type
+ *
+ * Returns: the #GType for Matrix3 objects
+ *
+ * Since: GIMP 2.8
+ **/
+GType
+gimp_matrix3_get_type (void)
+{
+  static GType matrix_type = 0;
+
+  if (!matrix_type)
+    matrix_type = g_boxed_type_register_static ("GimpMatrix3",
+                                               (GBoxedCopyFunc) matrix3_copy,
+                                               (GBoxedFreeFunc) g_free);
+
+  return matrix_type;
+}
+
+
+/*
+ * GIMP_TYPE_PARAM_MATRIX3
+ */
+
+#define GIMP_PARAM_SPEC_MATRIX3(pspec) (G_TYPE_CHECK_INSTANCE_CAST ((pspec), GIMP_TYPE_PARAM_MATRIX3, GimpParamSpecMatrix3))
+
+static void   gimp_param_matrix3_class_init  (GParamSpecClass *class);
+static void   gimp_param_matrix3_init        (GParamSpec      *pspec);
+static void   gimp_param_matrix3_set_default (GParamSpec      *pspec,
+                                              GValue          *value);
+static gint   gimp_param_matrix3_values_cmp  (GParamSpec      *pspec,
+                                              const GValue    *value1,
+                                              const GValue    *value2);
+
+typedef struct _GimpParamSpecMatrix3 GimpParamSpecMatrix3;
+
+struct _GimpParamSpecMatrix3
+{
+  GParamSpecBoxed      parent_instance;
+
+  GimpMatrix3          default_value;
+};
+
+/**
+ * gimp_param_matrix3_get_type:
+ *
+ * Reveals the object type
+ *
+ * Returns: the #GType for a GimpMatrix3 object
+ *
+ * Since: GIMP 2.8
+ **/
+GType
+gimp_param_matrix3_get_type (void)
+{
+  static GType spec_type = 0;
+
+  if (!spec_type)
+    {
+      static const GTypeInfo type_info =
+      {
+        sizeof (GParamSpecClass),
+        NULL, NULL,
+        (GClassInitFunc) gimp_param_matrix3_class_init,
+        NULL, NULL,
+        sizeof (GimpParamSpecMatrix3),
+        0,
+        (GInstanceInitFunc) gimp_param_matrix3_init
+      };
+
+      spec_type = g_type_register_static (G_TYPE_PARAM_BOXED,
+                                          "GimpParamMatrix3",
+                                          &type_info, 0);
+    }
+
+  return spec_type;
+}
+
+static void
+gimp_param_matrix3_class_init (GParamSpecClass *class)
+{
+  class->value_type        = GIMP_TYPE_MATRIX3;
+  class->value_set_default = gimp_param_matrix3_set_default;
+  class->values_cmp        = gimp_param_matrix3_values_cmp;
+}
+
+static void
+gimp_param_matrix3_init (GParamSpec *pspec)
+{
+  GimpParamSpecMatrix3 *cspec = GIMP_PARAM_SPEC_MATRIX3 (pspec);
+
+  gimp_matrix3_identity (&cspec->default_value);
+}
+
+static void
+gimp_param_matrix3_set_default (GParamSpec *pspec,
+                                GValue     *value)
+{
+  GimpParamSpecMatrix3 *cspec = GIMP_PARAM_SPEC_MATRIX3 (pspec);
+
+  g_value_set_static_boxed (value, &cspec->default_value);
+}
+
+static gint
+gimp_param_matrix3_values_cmp (GParamSpec   *pspec,
+                               const GValue *value1,
+                               const GValue *value2)
+{
+  GimpMatrix3 *matrix1;
+  GimpMatrix3 *matrix2;
+  gint         i, j;
+
+  matrix1 = value1->data[0].v_pointer;
+  matrix2 = value2->data[0].v_pointer;
+
+  /*  try to return at least *something*, it's useless anyway...  */
+
+  if (! matrix1)
+    return matrix2 != NULL ? -1 : 0;
+  else if (! matrix2)
+    return matrix1 != NULL;
+
+  for (i = 0; i < 3; i++)
+    for (j = 0; j < 3; j++)
+      if (matrix1->coeff[i][j] != matrix2->coeff[i][j])
+        return 1;
+
+  return 0;
+}
+
+/**
+ * gimp_param_spec_matrix3:
+ * @name:          Canonical name of the param
+ * @nick:          Nickname of the param
+ * @blurb:         Brief desciption of param.
+ * @default_value: Value to use if none is assigned.
+ * @flags:         a combination of #GParamFlags
+ *
+ * Creates a param spec to hold a #GimpMatrix3 value.
+ * See g_param_spec_internal() for more information.
+ *
+ * Returns: a newly allocated #GParamSpec instance
+ *
+ * Since: GIMP 2.8
+ **/
+GParamSpec *
+gimp_param_spec_matrix3 (const gchar       *name,
+                         const gchar       *nick,
+                         const gchar       *blurb,
+                         const GimpMatrix3 *default_value,
+                         GParamFlags        flags)
+{
+  GimpParamSpecMatrix3 *cspec;
+
+  cspec = g_param_spec_internal (GIMP_TYPE_PARAM_MATRIX3,
+                                 name, nick, blurb, flags);
+
+  if (default_value)
+    cspec->default_value = *default_value;
+
+  return G_PARAM_SPEC (cspec);
+}
+
+
+static GimpMatrix3 *
+matrix3_copy (const GimpMatrix3 *matrix)
+{
+  return (GimpMatrix3 *) g_memdup (matrix, sizeof (GimpMatrix3));
+}
+
+
 /**
  * gimp_matrix3_identity:
  * @matrix: A matrix.
diff --git a/libgimpmath/gimpmatrix.h b/libgimpmath/gimpmatrix.h
index c55646c..2b36bc2 100644
--- a/libgimpmath/gimpmatrix.h
+++ b/libgimpmath/gimpmatrix.h
@@ -59,6 +59,11 @@ struct _GimpMatrix4
   gdouble coeff[4][4];
 };
 
+
+/*****************/
+/*  GimpMatrix2  */
+/*****************/
+
 #define GIMP_TYPE_MATRIX2               (gimp_matrix2_get_type ())
 #define GIMP_VALUE_HOLDS_MATRIX2(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_MATRIX2))
 
@@ -81,6 +86,29 @@ void          gimp_matrix2_identity        (GimpMatrix2       *matrix);
 void          gimp_matrix2_mult            (const GimpMatrix2 *matrix1,
                                             GimpMatrix2       *matrix2);
 
+
+/*****************/
+/*  GimpMatrix3  */
+/*****************/
+
+#define GIMP_TYPE_MATRIX3               (gimp_matrix3_get_type ())
+#define GIMP_VALUE_HOLDS_MATRIX3(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_MATRIX3))
+
+GType         gimp_matrix3_get_type        (void) G_GNUC_CONST;
+
+
+#define GIMP_TYPE_PARAM_MATRIX3            (gimp_param_matrix3_get_type ())
+#define GIMP_IS_PARAM_SPEC_MATRIX3(pspec)  (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_MATRIX3))
+
+GType         gimp_param_matrix3_get_type  (void) G_GNUC_CONST;
+
+GParamSpec *  gimp_param_spec_matrix3      (const gchar        *name,
+                                            const gchar        *nick,
+                                            const gchar        *blurb,
+                                            const GimpMatrix3  *default_value,
+                                            GParamFlags         flags);
+
+
 void          gimp_matrix3_identity        (GimpMatrix3       *matrix);
 void          gimp_matrix3_mult            (const GimpMatrix3 *matrix1,
                                             GimpMatrix3       *matrix2);
@@ -118,6 +146,11 @@ void          gimp_matrix3_transform_point (const GimpMatrix3 *matrix,
                                             gdouble           *newx,
                                             gdouble           *newy);
 
+
+/*****************/
+/*  GimpMatrix4  */
+
+/*****************/
 void          gimp_matrix4_to_deg          (const GimpMatrix4 *matrix,
                                             gdouble           *a,
                                             gdouble           *b,