gegl r2295 - in trunk: . operations/workshop

[ok svn gnome org]

Author: ok
Date: Sat May 17 12:03:20 2008
New Revision: 2295
URL: http://svn.gnome.org/viewvc/gegl?rev=2295&view=rev

Log:
* operations/workshop/stroke.c: added operation that renders a stroked
path, using the path object, the actual rendering code currently
resides in the vector code and should probably be moved here.


Added:
   trunk/operations/workshop/stroke.c
Modified:
   trunk/ChangeLog

Added: trunk/operations/workshop/stroke.c
==============================================================================
--- (empty file)
+++ trunk/operations/workshop/stroke.c	Sat May 17 12:03:20 2008
@@ -0,0 +1,99 @@
+/* This file is an image processing operation for 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 Ãyvind KolÃs <pippin gimp org>
+ */
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+gegl_chant_vector (vector,   "Vector",
+                             "A GeglVector representing the path of the stroke")
+gegl_chant_color  (color,    "Color",      "rgba(0.1,0.2,0.3,1.0)",
+                             "Color of paint to use")
+gegl_chant_double (linewidth,"Linewidth",  0.0, 100.0, 3.0,
+                             "width of stroke")
+gegl_chant_double (hardness, "Hardness",   0.0, 1.0, 0.7,
+                             "hardness of brush, 0.0 for soft brush 1.0 for hard brush.")
+
+#else
+
+#define GEGL_CHANT_TYPE_SOURCE
+#define GEGL_CHANT_C_FILE "stroke.c"
+
+#include "gegl-plugin.h"
+
+/* the vector api isn't public yet */
+#include "property-types/gegl-vector.h"
+
+#include "gegl-chant.h"
+
+static void
+prepare (GeglOperation *operation)
+{
+  gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
+}
+
+static GeglRectangle
+get_bounding_box (GeglOperation *operation)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+  GeglRectangle defined = {0,0, 512,512};
+  gdouble x0,x1,y0,y1;
+
+  gegl_vector_get_bounds (o->vector, &x0, &x1, &y0, &y1);
+  defined.x = x0 - o->linewidth;
+  defined.y = y0 - o->linewidth;
+  defined.width = x1-x0 + o->linewidth * 2;
+  defined.height = y1-y0 + o->linewidth * 2;
+
+  return defined;
+}
+
+static gboolean
+process (GeglOperation       *operation,
+         GeglBuffer          *output,
+         const GeglRectangle *result)
+{
+  GeglChantO *o = GEGL_CHANT_PROPERTIES (operation);
+  GeglRectangle box = get_bounding_box (operation);
+
+  gegl_buffer_clear (output, &box);
+  gegl_vector_stroke (output, o->vector, o->color, o->linewidth, o->hardness);
+
+  return  TRUE;
+}
+
+
+static void
+gegl_chant_class_init (GeglChantClass *klass)
+{
+  GeglOperationClass       *operation_class;
+  GeglOperationSourceClass *source_class;
+
+  operation_class = GEGL_OPERATION_CLASS (klass);
+  source_class    = GEGL_OPERATION_SOURCE_CLASS (klass);
+
+  source_class->process = process;
+  operation_class->get_bounding_box = get_bounding_box;
+  operation_class->prepare = prepare;
+
+  operation_class->name        = "stroke";
+  operation_class->categories  = "render";
+  operation_class->description = "Renders a brush stroke";
+  operation_class->get_cached_region = NULL;
+}
+
+
+#endif