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hist hacking

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This commit is contained in:
John Cupitt 2010-03-24 21:50:15 +00:00
parent f9f9c5192c
commit f30e7c113b
2 changed files with 36 additions and 20 deletions
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2
TODO
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@ -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()?

54
libvips/histograms_lut/im_identity.c
View File

@ -1,23 +1,4 @@
/* @(#) Creates a image file with Xsize=256, Ysize=1, Bands=bands,
* @(#) 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
* @(#)
/* identity LUTs
*
* 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 )
{