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gtkdoc for im_zerox

This commit is contained in:
John Cupitt 2010-11-11 16:40:54 +00:00
parent 297890cebd
commit 9643cc6606
1 changed files with 37 additions and 32 deletions
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69
libvips/morphology/im_zerox.c
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@ -1,16 +1,4 @@
/* @(#) Functions which detects the +ve and -ve edges of
* @(#) zero crossings of an image depending on the flag
* @(#) Function im_zerox() assumes that the imin file is an integer image
* @(#) either memory mapped or in a buffer.
* @(#) The output image is byte with
* @(#) zero crossing set to 255 and all othre values set to zero
* @(#)
* @(#) int im_zerox(pimin, pimout, flag)
* @(#) IMAGE *pimin, *pimout;
* @(#) int flag;
* @(#)
* @(#) All functions return 0 on success and -1 on error
* @(#)
/* detect zero-crossings
*
* Copyright: 1990, N. Dessipris.
*
@ -22,6 +10,9 @@
* - some bugs removed
* 11/5/06
* - small clean ups
* 11/11/10
* - small cleanups
* - gtkdoc
*/
/*
@ -64,7 +55,7 @@
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
#define loop( TYPE ) \
#define LOOP( TYPE ) { \
for( i = 0; i < ne; i++ ) { \
TYPE p1 = ((TYPE *)p)[i]; \
TYPE p2 = ((TYPE *)p)[i + ba]; \
@ -75,7 +66,8 @@
q[i] = 255; \
else \
q[i] = 0; \
}
} \
}
/* Zerox generate function.
*/
@ -112,43 +104,56 @@ zerox_gen( REGION *or, void *seq, void *a, void *b )
PEL *q = (PEL *) IM_REGION_ADDR( or, le, y );
switch( in->BandFmt ) {
case IM_BANDFMT_CHAR: loop( signed char ); break;
case IM_BANDFMT_SHORT: loop( signed short ); break;
case IM_BANDFMT_INT: loop( signed int ); break;
case IM_BANDFMT_FLOAT: loop( float ); break;
case IM_BANDFMT_DOUBLE: loop( double ); break;
case IM_BANDFMT_CHAR: LOOP( signed char ); break;
case IM_BANDFMT_SHORT: LOOP( signed short ); break;
case IM_BANDFMT_INT: LOOP( signed int ); break;
case IM_BANDFMT_FLOAT: LOOP( float ); break;
case IM_BANDFMT_DOUBLE: LOOP( double ); break;
default:
error_exit( "im_zerox: internal error" );
/*NOTREACHED*/
g_assert( 0 );
}
}
return( 0 );
}
/**
* im_zerox:
* @in: input image
* @out: output image
* @sign: detect positive or negative zero crossings
*
* im_zerox() detects the positive or negative zero crossings @in,
* depending on @sign. If @sign is -1, negative zero crossings are returned,
* if @sign is 1, positive zero crossings are returned.
*
* The output image is byte with zero crossing set to 255 and all other values
* set to zero. Input can have any number of channels, and be any non-complex
* type.
*
* See also: im_conv(), im_rot90.
*
* Returns: 0 on success, -1 on error
*/
int
im_zerox( IMAGE *in, IMAGE *out, int flag )
{
IMAGE *t1 = im_open_local( out, "im_zerox#1" , "p" );
IMAGE *t1;
if( !t1 )
return( -1 );
if( flag != -1 && flag != 1 ) {
im_error( "im_zerox", "%s", _( "flag not -1 or 1" ) );
return( -1 );
}
if( im_piocheck( in, t1 ) )
return( -1 );
if( vips_bandfmt_iscomplex( in->BandFmt ) ||
in->Coding != IM_CODING_NONE ) {
im_error( "im_zerox", "%s", _( "non-complex uncoded only" ) );
return( -1 );
}
if( in->Xsize < 2 ) {
im_error( "im_zerox", "%s", _( "image too narrow" ) );
return( -1 );
}
if( !(t1 = im_open_local( out, "im_zerox" , "p" )) ||
im_piocheck( in, t1 ) ||
im_check_uncoded( "im_zerox", in ) ||
im_check_noncomplex( "im_zerox", in ) )
return( -1 );
if( vips_bandfmt_isuint( in->BandFmt ) )
/* Unsigned type, therefore there will be no zero-crossings.
*/