[gegl] gegl:color: Add format property

[Daniel Sabo <daniels src gnome org>]

commit dbc98dae34b00cf769a1d9aa1209f5042855dffe
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Mon Sep 30 00:45:37 2013 -0700

    gegl:color: Add format property

 operations/common/color.c     |   30 +++++++++++++++++-------------
 tests/xml/data/hdr-color.xml  |    1 +
 tests/xml/data/rgb-params.xml |    2 ++
 3 files changed, 20 insertions(+), 13 deletions(-)
---
diff --git a/operations/common/color.c b/operations/common/color.c
index f5d756c..57613c1 100644
--- a/operations/common/color.c
+++ b/operations/common/color.c
@@ -23,17 +23,27 @@
 
 gegl_chant_color (value, _("Color"), "black",
                   _("The color to render (defaults to 'black')"))
+
+gegl_chant_format (format, _("Babl Format"),
+                   _("The babl format of the output"))
+
 #else
 
 #define GEGL_CHANT_TYPE_POINT_RENDER
 #define GEGL_CHANT_C_FILE           "color.c"
 
 #include "gegl-chant.h"
+#include <gegl-utils.h>
 
 static void
 gegl_color_op_prepare (GeglOperation *operation)
 {
-  gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+
+  if (o->format)
+    gegl_operation_set_format (operation, "output", o->format);
+  else
+    gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
 }
 
 static GeglRectangle
@@ -50,21 +60,15 @@ gegl_color_op_process (GeglOperation       *operation,
                        gint                 level)
 {
   GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
-  gfloat     *out_pixel = out_buf;
-  gfloat      color[4];
+  const Babl *out_format = gegl_operation_get_format (operation, "output");
+  gint        pixel_size = babl_format_get_bytes_per_pixel (out_format);
+  void       *out_color  = alloca(pixel_size);
 
-  gegl_color_get_pixel (o->value, babl_format ("RGBA float"), color);
+  gegl_color_get_pixel (o->value, out_format, out_color);
 
-  while (n_pixels--)
-    {
-      out_pixel[0]=color[0];
-      out_pixel[1]=color[1];
-      out_pixel[2]=color[2];
-      out_pixel[3]=color[3];
+  gegl_memset_pattern (out_buf, out_color, pixel_size, n_pixels);
 
-      out_pixel += 4;
-    }
-  return  TRUE;
+  return TRUE;
 }
 
 
diff --git a/tests/xml/data/hdr-color.xml b/tests/xml/data/hdr-color.xml
index 537ebf6..9d1ee87 100644
--- a/tests/xml/data/hdr-color.xml
+++ b/tests/xml/data/hdr-color.xml
@@ -11,6 +11,7 @@
   <node operation='gegl:color'>
       <params>
         <param name='value'>rgb(100.0000, 100.0000, 100.0000)</param>
+        <param name='format'></param>
       </params>
   </node>
 </gegl>
diff --git a/tests/xml/data/rgb-params.xml b/tests/xml/data/rgb-params.xml
index db7eb55..2120e10 100644
--- a/tests/xml/data/rgb-params.xml
+++ b/tests/xml/data/rgb-params.xml
@@ -21,6 +21,7 @@
       <node operation='gegl:color'>
           <params>
             <param name='value'>rgb(0.0000, 5.0000, 1.0000)</param>
+            <param name='format'></param>
           </params>
       </node>
   </node>
@@ -35,6 +36,7 @@
   <node operation='gegl:color'>
       <params>
         <param name='value'>rgb(0.0000, 5.0000, 1.0000)</param>
+        <param name='format'></param>
       </params>
   </node>
 </gegl>