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/* fast shrink by a power of two
*
* Copyright: 2006, Tom Vajzovic
*
* Author: Tom Vajzovic
*
* Written on: 2006-07-26
*
* 2006-12-17 tcv:
* - rewrite generator function macros to produce many smaller functions
* - remove post-shift-up functionality
* 2007-02-02 jc
* - added return 0; on success
* - FUNCTION_NAME updated
* 2/2/11
* - gtk-doc
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/** HEADERS **/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H */
#include <vips/intl.h>
#include <stdlib.h>
#include <string.h>
#include <vips/vips.h>
/** LOCAL FUNCTION DECLARATIONS **/
/* function prototype macro */
#define GEN_FUNC( SHIFT_MACRO, FROM_T, TO_T, SUM_T ) \
static int gen_ ## SHIFT_MACRO ## _ ## FROM_T ## _to_ ## TO_T ## _with_ ## SUM_T( \
REGION *to_make, void *seq, void *a, void *b );
/* macros to call function prototype macro for all possible combinations of types and macros */
#define GEN_FUNCS_TO( SIGN, FROM_T, TO_T ) \
GEN_FUNC( PRE_POST_SHIFT, FROM_T, TO_T, SIGN ## 64 ) \
GEN_FUNC( POST_SHIFT, FROM_T, TO_T, SIGN ## 64 ) \
GEN_FUNC( POST_SHIFT, FROM_T, TO_T, SIGN ## 32 ) \
GEN_FUNC( NO_SHIFT, FROM_T, TO_T, SIGN ## 32 )
#define GEN_FUNCS_FROM( SIGN, FROM_T ) \
GEN_FUNCS_TO( SIGN, FROM_T, SIGN ## 32 ) \
GEN_FUNCS_TO( SIGN, FROM_T, SIGN ## 16 ) \
GEN_FUNCS_TO( SIGN, FROM_T, SIGN ## 8 )
#define GEN_FUNCS_SIGN( SIGN ) \
GEN_FUNCS_FROM( SIGN, SIGN ## 32 ) \
GEN_FUNCS_FROM( SIGN, SIGN ## 16 ) \
GEN_FUNCS_FROM( SIGN, SIGN ## 8 )
GEN_FUNCS_SIGN( gint )
GEN_FUNCS_SIGN( guint )
/** FUNCTION DEFINITIONS **/
/**
* im_rightshift_size:
* @in: input image
* @out: output image
* @xshift: horizontal shrink
* @yshift: vertical shrink
* @band_fmt: output format
*
* Shrink @in by a pair of power-of-two factors, shifting to give
* output of the specified band format. This is faster than im_shrink().
*
* See also: im_shrink(), im_affinei().
*
* Returns: 0 on success, -1 on error
*/
int
im_rightshift_size( IMAGE *in, IMAGE *out, int xshift, int yshift, int band_fmt ){
#define FUNCTION_NAME "im_rightshift_size"
int *params;
int needbits;
int outbits;
if( im_piocheck( in, out ) )
return -1;
if( xshift < 0 || yshift < 0 ){
im_error( FUNCTION_NAME, "%s", _( "bad arguments" ) );
return -1;
}
if( ! xshift && ! yshift ){
im_warn( FUNCTION_NAME, "%s", _( "shift by zero: falling back to im_copy" ) );
return im_copy( in, out );
}
if( ! in-> Xsize >> xshift || ! in-> Ysize >> yshift ){
im_error( FUNCTION_NAME, "%s", _( "would result in zero size output image" ) );
return -1;
}
if( im_check_int( FUNCTION_NAME, in ) ||
im_check_uncoded( FUNCTION_NAME, in ) )
return -1;
if( vips_bandfmt_isuint( in->BandFmt ) != vips_bandfmt_isuint( band_fmt ) ) {
im_error( FUNCTION_NAME, "%s",
_( "image and band_fmt must match in sign" ) );
return -1;
}
outbits= im_bits_of_fmt( band_fmt );
if( -1 == outbits )
return -1;
needbits= im_bits_of_fmt( in-> BandFmt ) + xshift + yshift;
params= IM_ARRAY( out, 4, int );
if( ! params )
return -1;
params[ 0 ]= xshift; /* xshift */
params[ 1 ]= yshift; /* yshift */
if( im_cp_desc( out, in ) )
return -1;
out-> Xsize >>= xshift;
out-> Ysize >>= yshift;
out-> Xres/= ( 1 << xshift ); /* x scale */
out-> Yres/= ( 1 << yshift ); /* y scale */
out-> BandFmt= band_fmt;
if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) )
return -1;
#define RETURN_MACRO( MACRO, FROM_T, TO_T, SUM_T ) \
return im_generate( out, im_start_one, gen_ ## MACRO ## _ ## FROM_T ## _to_ ## TO_T ## _with_ ## SUM_T, im_stop_one, in, params );
#define RETURN_MACRO_OUTS( MACRO, SUM_SIZE, OUT_SIZE ) switch( in-> BandFmt ){ \
\
case IM_BANDFMT_CHAR: \
RETURN_MACRO( MACRO, gint8, gint ## OUT_SIZE, gint ## SUM_SIZE ) \
\
case IM_BANDFMT_UCHAR: \
RETURN_MACRO( MACRO, guint8, guint ## OUT_SIZE, guint ## SUM_SIZE ) \
\
case IM_BANDFMT_SHORT: \
RETURN_MACRO( MACRO, gint16, gint ## OUT_SIZE, gint ## SUM_SIZE ) \
\
case IM_BANDFMT_USHORT: \
RETURN_MACRO( MACRO, guint16, guint ## OUT_SIZE, guint ## SUM_SIZE ) \
\
case IM_BANDFMT_INT: \
RETURN_MACRO( MACRO, gint32, gint ## OUT_SIZE, gint ## SUM_SIZE ) \
\
case IM_BANDFMT_UINT: \
RETURN_MACRO( MACRO, guint32, guint ## OUT_SIZE, guint ## SUM_SIZE ) \
default: \
g_assert( 0 ); \
}
#define RETURN_MACRO_SUMSS( MACRO, SUM_SIZE ) switch( im_bits_of_fmt( out->BandFmt ) ){ \
case 32: \
RETURN_MACRO_OUTS( MACRO, SUM_SIZE, 32 ) \
case 16: \
RETURN_MACRO_OUTS( MACRO, SUM_SIZE, 16 ) \
case 8: \
RETURN_MACRO_OUTS( MACRO, SUM_SIZE, 8 ) \
}
if( needbits > 64 ){
params[ 2 ]= needbits - 64;
params[ 3 ]= 64 - outbits;
RETURN_MACRO_SUMSS( PRE_POST_SHIFT, 64 )
}
if( needbits > 32 ){
params[ 3 ]= needbits - outbits;
RETURN_MACRO_SUMSS( POST_SHIFT, 64 )
}
if( needbits > outbits ){
params[ 3 ]= needbits - outbits;
RETURN_MACRO_SUMSS( POST_SHIFT, 32 )
}
RETURN_MACRO_SUMSS( NO_SHIFT, 32 )
return 0;
#undef FUNCTION_NAME
}
/** LOCAL FUNCTION DEFINITIONS **/
/* macros used in the function creating macro */
#define PRE_POST_SHIFT() pixel+= from[ fx ] >> preshift; \
to[ tx ]= pixel >> postshift;
#define POST_SHIFT() pixel+= from[ fx ]; \
to[ tx ]= pixel >> postshift;
#define NO_SHIFT() pixel+= from[ fx ]; \
to[ tx ]= pixel;
/* function creating macro */
#undef GEN_FUNC
#define GEN_FUNC( SHIFT_MACRO, FROM_T, TO_T, SUM_T ) \
static int gen_ ## SHIFT_MACRO ## _ ## FROM_T ## _to_ ## TO_T ## _with_ ## SUM_T( \
REGION *to_make, void *seq, void *a, void *b ){ \
\
REGION *make_from = (REGION *) seq; \
int *params = (int *) b; \
int xshift= params[0]; \
int yshift= params[1]; \
int G_GNUC_UNUSED preshift= params[2]; \
int G_GNUC_UNUSED postshift= params[3]; \
Rect need= { \
to_make-> valid. left << xshift, \
to_make-> valid. top << yshift, \
to_make-> valid. width << xshift, \
to_make-> valid. height << yshift \
}; \
TO_T *to_start= (TO_T*) IM_REGION_ADDR( to_make, to_make-> valid. left, to_make-> valid. top ); \
TO_T *to, *ty_stop; \
SUM_T pixel; \
FROM_T *from_start, *from_row, *from, *fy_stop; \
\
int band, tx, fx; \
int tx_max= to_make-> valid. width * to_make-> im-> Bands; \
int fx_max= to_make-> im-> Bands << xshift; \
\
size_t t_skip= IM_REGION_LSKIP( to_make ) / sizeof( TO_T ); \
size_t f_skip; \
\
if( im_prepare( make_from, &need ) || ! im_rect_includesrect( &make_from-> valid, &need ) ) \
return -1; \
\
from_start= (FROM_T*) IM_REGION_ADDR( make_from, need. left, need. top ); \
f_skip= IM_REGION_LSKIP( make_from ) / sizeof( FROM_T ); \
\
for( band= 0; band < make_from-> im-> Bands; ++band ){ \
\
to= to_start + band; \
ty_stop= to + t_skip * to_make-> valid. height; \
\
from_row= from_start + band; \
\
for( ; to < ty_stop; to+= t_skip, from_row+= f_skip << yshift ) \
for( tx= 0; tx < tx_max; tx+= to_make-> im-> Bands ){ \
\
from= from_row + ( tx << xshift ); \
fy_stop= from + ( f_skip << yshift ); \
\
pixel= 0; \
\
for( ; from < fy_stop; from+= f_skip ) \
for( fx= 0; fx < fx_max; fx+= to_make-> im-> Bands ) \
SHIFT_MACRO() \
} \
} \
return 0; \
}
/* create functions for all possible combinations of types and macros */
GEN_FUNCS_SIGN( gint )
GEN_FUNCS_SIGN( guint )
|
