hist hacking

TODO

@@ -4,6 +4,8 @@
 
 - check the order of decls in hist.h, is it sensible?
 
+  check the order in freq_flt as well
+
 - im_render() should be renamed as vips_sink_screen()? also vips_sink_disc()
   instead of vips_discsink()?
 

libvips/histograms_lut/im_identity.c

@@ -1,23 +1,4 @@
-/* @(#) Creates a image file with Xsize=256, Ysize=1, Bands=bands,
+/* identity LUTs
- * @(#) BandFmt=IM_BANDFMT_UCHAR, Type=IM_TYPE_HISTOGRAM;
- * @(#) 
- * @(#) The created image consist a n bands linear lut and is the basis 
- * @(#) for building up look-up tables.
- * @(#) 
- * @(#) int im_identity(lut, bands)
- * @(#) IMAGE *lut;
- * @(#) int bands;
- * @(#)
- * @(#) As above, but make a ushort LUT. ushort LUTs can be less than 65536
- * @(#) elements - sz is the number of elements required.
- * @(#)
- * @(#) int im_identity_ushort(lut, bands, sz)
- * @(#) IMAGE *lut;
- * @(#) int bands;
- * @(#) int sz;
- * @(#)
- * @(#) Returns -1 on error and 0 on success
- * @(#) 
  *
  * Copyright 1991, N. Dessipris.
  *
@@ -29,6 +10,8 @@
  *	- ANSIfied
  * 24/8/94 JC
  *	- im_identity_ushort() added
+ * 24/3/10
+ * 	- gtkdoc
  */
 
 /*
@@ -72,6 +55,21 @@
 #include <dmalloc.h>
 #endif /*WITH_DMALLOC*/
 
+/**
+ * im_identity:
+ * @lut: output image
+ * @bands: number of bands to create
+ *
+ * Creates a image file with Xsize=256, Ysize=1, Bands=@bands,
+ * BandFmt=IM_BANDFMT_UCHAR, Type=IM_TYPE_HISTOGRAM.
+ *
+ * The created image consist a @bands-bands linear lut and is the basis 
+ * for building up look-up tables.
+ *
+ * See also: im_identity_ushort().
+ *
+ * Returns: 0 on success, -1 on error
+ */
 int 
 im_identity( IMAGE *lut, int bands )
 {
@@ -115,6 +113,22 @@ im_identity( IMAGE *lut, int bands )
         return( 0 );
 }
 
+/**
+ * im_identity_ushort:
+ * @lut: output image
+ * @bands: number of bands to create
+ * @sz: size of LUT to create
+ *
+ * As im_identity(), but make a ushort LUT. ushort LUTs can be up to 65536
+ * elements - @sz is the number of elements required.
+ *
+ * The created image consist a @bands-bands linear lut and is the basis 
+ * for building up look-up tables.
+ *
+ * See also: im_identity().
+ *
+ * Returns: 0 on success, -1 on error
+ */
 int 
 im_identity_ushort( IMAGE *lut, int bands, int sz )
 {