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find hist of any image type 

... by casting to u8/u16.
This commit is contained in:
John Cupitt 2012-01-25 15:03:13 +00:00
parent e518427437
commit 21f9a7f69b
2 changed files with 26 additions and 4 deletions
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28
libvips/histograms_lut/im_histgr.c
View File

@ -19,7 +19,9 @@
* - number bands from zero
* 24/3/10
* - gtkdoc
* - small celanups
* - small cleanups
* 25/1/12
* - cast @in to u8/u16.
*/
/*
@ -281,6 +283,19 @@ find_ushort_hist_extract( REGION *reg,
return( 0 );
}
/* Save a bit of typing.
*/
#define UC IM_BANDFMT_UCHAR
#define US IM_BANDFMT_USHORT
#define UI IM_BANDFMT_UINT
/* Type mapping: go to uchar or ushort.
*/
static int bandfmt_histgr[10] = {
/* UC C US S UI I F X D DX */
UC, UC, US, US, US, US, US, US, US, US
};
/**
* im_histgr:
* @in: input image
@ -291,7 +306,7 @@ find_ushort_hist_extract( REGION *reg,
* one-band histogram), or for all bands (producing an n-band histogram) if
* @bandno is -1.
*
* @in must be u8 or u16. @out is always u32.
* @in is cast to u8 or u16. @out is always u32.
*
* See also: im_hist_indexed(), im_histeq().
*
@ -300,6 +315,7 @@ find_ushort_hist_extract( REGION *reg,
int
im_histgr( IMAGE *in, IMAGE *out, int bandno )
{
IMAGE *t;
int size; /* Length of hist */
int bands; /* Number of bands in output */
Histogram *mhist;
@ -310,12 +326,18 @@ im_histgr( IMAGE *in, IMAGE *out, int bandno )
/* Check images. PIO from in, WIO to out.
*/
if( im_check_uncoded( "im_histgr", in ) ||
im_check_u8or16( "im_histgr", in ) ||
im_check_bandno( "im_histgr", in, bandno ) ||
im_pincheck( in ) ||
im_outcheck( out ) )
return( -1 );
/* Cast in to u8/u16.
*/
if( !(t = im_open_local( out, "im_histgr", "p" )) ||
im_clip2fmt( in, t, bandfmt_histgr[in->BandFmt] ) )
return( -1 );
in = t;
/* Find the range of pixel values we must handle.
*/
size = in->BandFmt == IM_BANDFMT_UCHAR ? 256 : 65536;

2
libvips/histograms_lut/im_maplut.c
View File

@ -586,7 +586,7 @@ im_maplut( IMAGE *in, IMAGE *out, IMAGE *lut )
im_incheck( lut ) )
return( -1 );
/* Cast in to u8/u16.
/* Cast in to u8/u16/u32.
*/
if( !(t = im_open_local( out, "im_maplut", "p" )) ||
im_clip2fmt( in, t, bandfmt_maplut[in->BandFmt] ) )