gegl r2274 - in trunk: . gegl/buffer

[ok svn gnome org]

Author: ok
Date: Mon May  5 21:49:18 2008
New Revision: 2274
URL: http://svn.gnome.org/viewvc/gegl?rev=2274&view=rev

Log:
* gegl/buffer/gegl-buffer.h: added new method gegl_buffer_clear()
* gegl/buffer/gegl-buffer-access.c: (gegl_buffer_clear):


Modified:
   trunk/ChangeLog
   trunk/gegl/buffer/gegl-buffer-access.c
   trunk/gegl/buffer/gegl-buffer.h

Modified: trunk/gegl/buffer/gegl-buffer-access.c
==============================================================================
--- trunk/gegl/buffer/gegl-buffer-access.c	(original)
+++ trunk/gegl/buffer/gegl-buffer-access.c	Mon May  5 21:49:18 2008
@@ -1203,6 +1203,41 @@
   g_free (temp);
 }
 
+void
+gegl_buffer_clear (GeglBuffer          *dst,
+                   const GeglRectangle *dst_rect)
+{
+  /* FIXME: make gegl_buffer_copy work with COW shared tiles when possible */
+
+  GeglRectangle dst_line;
+  const Babl   *format;
+  guchar       *temp;
+  guint         i;
+  gint          pxsize;
+
+  g_return_if_fail (GEGL_IS_BUFFER (dst));
+
+  if (!dst_rect)
+    {
+      dst_rect = gegl_buffer_get_extent (dst);
+    }
+
+  pxsize = dst->tile_storage->px_size;
+  format = dst->format;
+
+  dst_line = *dst_rect;
+  dst_line.height = 1;
+
+  temp = g_malloc0 (dst_line.width * pxsize);
+
+  for (i=0; i<dst_rect->height; i++)
+    {
+      gegl_buffer_set (dst, &dst_line, format, temp, GEGL_AUTO_ROWSTRIDE);
+      dst_line.y++;
+    }
+  g_free (temp);
+}
+
 GeglBuffer *
 gegl_buffer_dup (GeglBuffer *buffer)
 {

Modified: trunk/gegl/buffer/gegl-buffer.h
==============================================================================
--- trunk/gegl/buffer/gegl-buffer.h	(original)
+++ trunk/gegl/buffer/gegl-buffer.h	Mon May  5 21:49:18 2008
@@ -240,6 +240,18 @@
 
 
 /**
+ * gegl_buffer_clear:
+ * @buffer: a #GeglBuffer
+ * @roi: a rectangular region
+ *
+ * Clears the provided rectangular region by setting all the associated memory
+ * to 0
+ */
+void            gegl_buffer_clear             (GeglBuffer          *buffer,
+                                               const GeglRectangle *roi);
+
+
+/**
  * gegl_buffer_copy:
  * @src: source buffer.
  * @src_rect: source rectangle (or NULL to copy entire source buffer)