345 lines
7.6 KiB
C
345 lines
7.6 KiB
C
/* @(#) Convert a signed or unsigned, char or short or int image into unsigned
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* @(#) char very quickly, by discarding the lower order bits. Signed values
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* @(#) are converted to unsigned by adding 128.
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* @(#)
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* @(#) int
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* @(#) im_msb(
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* @(#) IMAGE *in,
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* @(#) IMAGE *out
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* @(#) );
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* @(#)
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* @(#) As above, but also discard all but the specified band:
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* @(#)
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* @(#) int
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* @(#) im_msb(
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* @(#) IMAGE *in,
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* @(#) IMAGE *out,
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* @(#) int band
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* @(#) );
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*
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* Copyright: 2006, The Nottingham Trent University
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*
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* Author: Tom Vajzovic
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*
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* Written on: 2006-03-13
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* 27/9/06
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* - removed extra im_free() in im_copy() fallback
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* 4/10/06
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* - removed warning on uchar fallback: it happens a lot with nip2 and
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* isn't very serious
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/** HEADERS **/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H */
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#include <vips/intl.h>
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#include <stdlib.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC */
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/** MACROS **/
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/* BAND FORMAT TESTS */
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#define SIZEOF_BAND(band_fmt) ( \
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( IM_BANDFMT_UCHAR == (band_fmt) ) ? sizeof(unsigned char) \
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: ( IM_BANDFMT_CHAR == (band_fmt) ) ? sizeof(signed char) \
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: ( IM_BANDFMT_USHORT == (band_fmt) ) ? sizeof(unsigned short int) \
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: ( IM_BANDFMT_SHORT == (band_fmt) ) ? sizeof(signed short int) \
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: ( IM_BANDFMT_UINT == (band_fmt) ) ? sizeof(unsigned int) \
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: ( IM_BANDFMT_INT == (band_fmt) ) ? sizeof(signed int) \
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: ( IM_BANDFMT_FLOAT == (band_fmt) ) ? sizeof(float) \
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: ( IM_BANDFMT_DOUBLE == (band_fmt) ) ? sizeof(double) \
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: ( IM_BANDFMT_COMPLEX == (band_fmt) ) ? ( 2 * sizeof(float) ) \
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: ( 2 * sizeof(double) ) )
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#define BANDFMT_SHORT_CHAR(band_fmt) ( \
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IM_BANDFMT_SHORT == (band_fmt) \
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|| IM_BANDFMT_USHORT == (band_fmt) \
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|| IM_BANDFMT_CHAR == (band_fmt) \
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|| IM_BANDFMT_UCHAR == (band_fmt) )
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#define BANDFMT_ANY_INT(band_fmt) ( \
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IM_BANDFMT_INT == (band_fmt) \
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|| IM_BANDFMT_UINT == (band_fmt) \
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|| BANDFMT_SHORT_CHAR(band_fmt) )
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#define BANDFMT_UNSIGNED(band_fmt) ( \
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IM_BANDFMT_UINT == (band_fmt) \
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|| IM_BANDFMT_USHORT == (band_fmt) \
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|| IM_BANDFMT_UCHAR == (band_fmt) )
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/* IMAGE TESTS */
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#define IM_ANY_INT(im) BANDFMT_ANY_INT((im)-> BandFmt)
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#define IM_UNSIGNED(im) BANDFMT_UNSIGNED((im)-> BandFmt)
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#define IM_UNCODED(im) ( IM_CODING_NONE == (im)-> Coding )
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/** LOCAL FUNCTIONS DECLARATIONS **/
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static void byte_select (unsigned char *in, unsigned char *out, int n,
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size_t * params);
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static void byte_select_flip (unsigned char *in, unsigned char *out, int n,
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size_t * params);
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static void msb_labq (unsigned char *in, unsigned char *out, int n);
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/** EXPORTED FUNCTIONS **/
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int
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im_msb (IMAGE * in, IMAGE * out)
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{
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#define FUNCTION_NAME "im_msb"
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size_t *params;
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im_wrapone_fn func;
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#define index (params[0])
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#define width (params[1])
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#define repeat (params[2])
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if (im_piocheck (in, out))
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return -1;
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/* Stops a used-before-set warning.
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*/
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params = NULL;
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if (IM_UNCODED (in))
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{
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if (!IM_ANY_INT (in))
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{
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im_error (FUNCTION_NAME, _("char, short or int only"));
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return -1;
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}
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params = IM_ARRAY (out, 3, size_t);
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if (!params)
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return -1;
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width = SIZEOF_BAND (in->BandFmt);
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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index = 0;
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#else
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index = width - 1;
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#endif
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repeat = in->Bands;
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if (IM_UNSIGNED (in))
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func = (im_wrapone_fn) byte_select;
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else
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func = (im_wrapone_fn) byte_select_flip;
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if (1 == width && (im_wrapone_fn) byte_select == func)
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{
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return im_copy (in, out);
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}
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}
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else if (IM_CODING_LABQ == in->Coding)
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func = (im_wrapone_fn) msb_labq;
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else
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{
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im_error (FUNCTION_NAME, _("unknown coding"));
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return -1;
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}
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if (im_cp_desc (out, in))
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return -1;
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out->Bbits = sizeof (unsigned char) << 3;
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out->BandFmt = IM_BANDFMT_UCHAR;
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out->Coding = IM_CODING_NONE;
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return im_wrapone (in, out, func, (void *) params, NULL);
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#undef index
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#undef width
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#undef repeat
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#undef FUNCTION_NAME
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}
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int
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im_msb_band (IMAGE * in, IMAGE * out, int band)
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{
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#define FUNCTION_NAME "im_msb_band"
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size_t *params;
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im_wrapone_fn func;
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#define index (params[0])
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#define width (params[1])
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#define repeat (params[2])
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if (band < 0)
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{
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im_error (FUNCTION_NAME, _("bad arguments"));
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return -1;
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}
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if (im_piocheck (in, out))
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return -1;
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params = IM_ARRAY (out, 3, size_t);
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if (!params)
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return -1;
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if (IM_UNCODED (in))
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{
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if (!IM_ANY_INT (in))
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{
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im_error (FUNCTION_NAME, _("char, short or int only"));
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return -1;
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}
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if (band >= in->Bands)
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{
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im_error (FUNCTION_NAME, _("image does not have that many bands"));
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return -1;
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}
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width = SIZEOF_BAND (in->BandFmt);
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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index = width * band;
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#else
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index = (width * (band + 1)) - 1;
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#endif
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width *= in->Bands;
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repeat = 1;
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if (IM_UNSIGNED (in))
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func = (im_wrapone_fn) byte_select;
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else
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func = (im_wrapone_fn) byte_select_flip;
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}
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else if (IM_CODING_LABQ == in->Coding)
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{
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if (band > 2)
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{
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im_error (FUNCTION_NAME, _("image does not have that many bands"));
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return -1;
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}
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width = 4;
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repeat = 1;
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index = band;
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if (band)
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func = (im_wrapone_fn) byte_select_flip;
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else
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func = (im_wrapone_fn) byte_select;
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}
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else
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{
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im_error (FUNCTION_NAME, _("unknown coding"));
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return -1;
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}
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if (im_cp_desc (out, in))
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return -1;
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out->Bands = 1;
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out->Bbits = sizeof (unsigned char) << 3;
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out->BandFmt = IM_BANDFMT_UCHAR;
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out->Coding = IM_CODING_NONE;
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return im_wrapone (in, out, func, (void *) params, NULL);
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#undef index
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#undef width
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#undef repeat
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#undef FUNCTION_NAME
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}
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/** LOCAL FUNCTIONS DEFINITIONS **/
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static void
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byte_select (unsigned char *in, unsigned char *out, int n, size_t * params)
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{
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#define index (params[0])
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#define width (params[1])
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#define repeat (params[2])
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unsigned char *stop = out + n * repeat;
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for (in += index; out < stop; in += width, ++out)
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*out = *in;
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#undef index
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#undef width
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#undef repeat
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}
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static void
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byte_select_flip (unsigned char *in, unsigned char *out, int n,
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size_t * params)
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{
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#define index (params[0])
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#define width (params[1])
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#define repeat (params[2])
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unsigned char *stop = out + n * repeat;
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for (in += index; out < stop; in += width, ++out)
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*out = 0x80 ^ *in;
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#undef index
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#undef width
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#undef repeat
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}
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static void
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msb_labq (unsigned char *in, unsigned char *out, int n)
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{
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unsigned char *stop = in + (n << 2);
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for (; in < stop; in += 4, out += 3)
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{
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out[0] = in[0];
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out[1] = 0x80 ^ in[1];
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out[2] = 0x80 ^ in[2];
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}
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}
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