[gegl] transform: add scaleratio and scalesize operation to be more user-friendly the scaleratio operation

[Michael Murà <mmure src gnome org>]

commit fbedc720da5432b19456b5f7547dafbd8c193d16
Author: Michael Murà <batolettre gmail com>
Date:   Fri Apr 27 17:35:42 2012 +0900

    transform: add scaleratio and scalesize operation to be more user-friendly the scaleratio operation is the same as the original scale the scale operation is to be removed with the next major version of GEGL

 operations/transform/Makefile.am   |    2 +
 operations/transform/module.c      |   14 +++++---
 operations/transform/scale-ratio.c |   49 +++++++++++++++++++++++++++++
 operations/transform/scale-size.c  |   59 ++++++++++++++++++++++++++++++++++++
 operations/transform/scale.c       |    3 ++
 5 files changed, 122 insertions(+), 5 deletions(-)
---
diff --git a/operations/transform/Makefile.am b/operations/transform/Makefile.am
index 218f30c..90012d7 100644
--- a/operations/transform/Makefile.am
+++ b/operations/transform/Makefile.am
@@ -14,6 +14,8 @@ transformops_la_SOURCES = \
 	reflect.c	\
 	rotate.c	\
 	scale.c		\
+	scale-ratio.c \
+	scale-size.c \
 	shear.c		\
 	transform.c	\
 	translate.c	\
diff --git a/operations/transform/module.c b/operations/transform/module.c
index 4ebf301..1833e95 100644
--- a/operations/transform/module.c
+++ b/operations/transform/module.c
@@ -39,11 +39,13 @@ gegl_module_query (GTypeModule *module)
   return &modinfo;
 }
 
-GType rotate_get_type    (void);
-GType scale_get_type     (void);
-GType shear_get_type     (void);
-GType translate_get_type (void);
-GType reflect_get_type (void);
+GType rotate_get_type      (void);
+GType scale_get_type       (void);
+GType scaleratio_get_type  (void);
+GType scalesize_get_type   (void);
+GType shear_get_type       (void);
+GType translate_get_type   (void);
+GType reflect_get_type     (void);
 GType transform_get_type   (void);
 
 G_MODULE_EXPORT gboolean
@@ -55,6 +57,8 @@ gegl_module_register (GTypeModule *module)
   dummy = op_affine_get_type ();
   dummy = rotate_get_type ();
   dummy = scale_get_type ();
+  dummy = scaleratio_get_type ();
+  dummy = scalesize_get_type ();
   dummy = shear_get_type ();
   dummy = translate_get_type ();
   dummy = reflect_get_type ();
diff --git a/operations/transform/scale-ratio.c b/operations/transform/scale-ratio.c
new file mode 100644
index 0000000..28d82d5
--- /dev/null
+++ b/operations/transform/scale-ratio.c
@@ -0,0 +1,49 @@
+/* This file is part of GEGL
+ *
+ * GEGL is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * GEGL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2006 Philip Lafleur
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+gegl_chant_double (x, -G_MAXDOUBLE, G_MAXDOUBLE, 1.0,
+                   _("Horizontal scale factor"))
+gegl_chant_double (y, -G_MAXDOUBLE, G_MAXDOUBLE, 1.0,
+                   _("Vertical scale factor"))
+
+#else
+
+#define GEGL_CHANT_NAME scaleratio
+#define GEGL_CHANT_DESCRIPTION _("Scales the buffer according to a ratio.")
+#define GEGL_CHANT_SELF "scale-ratio.c"
+#include "chant.h"
+
+#include <math.h>
+
+static void
+create_matrix (OpTransform *op,
+               GeglMatrix3 *matrix)
+{
+  GeglChantOperation *chant = GEGL_CHANT_OPERATION (op);
+
+  matrix->coeff [0][0] = chant->x;
+  matrix->coeff [1][1] = chant->y;
+}
+
+#endif
diff --git a/operations/transform/scale-size.c b/operations/transform/scale-size.c
new file mode 100644
index 0000000..a0395bd
--- /dev/null
+++ b/operations/transform/scale-size.c
@@ -0,0 +1,59 @@
+/* This file is part of GEGL
+ *
+ * GEGL is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * GEGL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2012 Michael Murà <batolettre gmail com>
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+gegl_chant_double (x, -G_MAXDOUBLE, G_MAXDOUBLE, 100.0,
+                   _("Horizontal size"))
+gegl_chant_double (y, -G_MAXDOUBLE, G_MAXDOUBLE, 100.0,
+                   _("Vertical size"))
+
+#else
+
+#define GEGL_CHANT_NAME scalesize
+#define GEGL_CHANT_DESCRIPTION _("Scales the buffer according to a size.")
+#define GEGL_CHANT_SELF "scale-size.c"
+#include "chant.h"
+
+#include <math.h>
+
+static void
+create_matrix (OpTransform *op,
+               GeglMatrix3 *matrix)
+{
+  GeglChantOperation *chant = GEGL_CHANT_OPERATION (op);
+  GeglOperation *operation  = GEGL_OPERATION (op);
+  GeglRectangle  in_rect = {0,0,0,0};
+
+  if (gegl_operation_source_get_bounding_box (operation, "input"))
+    in_rect = *gegl_operation_source_get_bounding_box (operation, "input");
+
+  if(in_rect.width < 1)
+    in_rect.width = 1;
+  if(in_rect.height < 1)
+    in_rect.height = 1;
+
+  matrix->coeff [0][0] = chant->x / (gdouble) in_rect.width;
+  matrix->coeff [1][1] = chant->y / (gdouble) in_rect.height;
+}
+
+#endif
diff --git a/operations/transform/scale.c b/operations/transform/scale.c
index acfe787..4aa064d 100644
--- a/operations/transform/scale.c
+++ b/operations/transform/scale.c
@@ -19,6 +19,9 @@
 #include "config.h"
 #include <glib/gi18n-lib.h>
 
+/*  This operation is deprecated and is to be removed with the next version of GEGL.
+ *  Use the scaleratio operation instead.
+ */
 
 #ifdef GEGL_CHANT_PROPERTIES