166 lines
3.8 KiB
C
166 lines
3.8 KiB
C
/* im_LabQ2Lab
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*
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* Copyright Kirk Martinez 2/5/1993
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*
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* Modified: 16/6/93
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* 7/6/93 JC
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* - adapted for partial v2
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* 16/11/94 JC
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* - adapted to new im_wrap_oneonebuf() function.
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* 9/2/95 JC
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* - new im_wrapone function
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* 22/5/95 JC
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* - changed char to unsigned char for RS/6000
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* - small tidies and speed-ups
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* 4/9/97 JC
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* - L* = 100.0 now handled correctly
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* 2/11/09
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* - gtkdoc
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* 20/9/12
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* - redo as a class
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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#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 <stdio.h>
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#include <vips/vips.h>
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#include "colour.h"
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typedef VipsColourCode VipsLabQ2Lab;
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typedef VipsColourCodeClass VipsLabQ2LabClass;
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G_DEFINE_TYPE( VipsLabQ2Lab, vips_LabQ2Lab, VIPS_TYPE_COLOUR_CODE );
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/* imb_LabQ2Lab: CONVERT n pels from packed 32bit Lab to float values
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* in a buffer
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* ARGS: VipsPel *inp pointer to first byte of Lab32 buffer
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* float *outbuf destination buffer
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* int n number of pels to process
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* (C) K.Martinez 2/5/93
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*/
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static void
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vips_LabQ2Lab_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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signed char *p = (signed char *) in[0];
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float *q = (float *) out;
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int l;
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int lsbs; /* for lsbs byte */
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int i; /* counter */
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/* Read input with a signed pointer to get signed ab easily.
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*/
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for( i = 0; i < width; i++ ) {
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/* Get extra bits.
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*/
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lsbs = ((unsigned char *) p)[3];
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/* Build L.
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*/
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l = ((unsigned char *)p)[0];
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l = (l << 2) | (lsbs >> 6);
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q[0] = (float) l * (100.0 / 1023.0);
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/* Build a.
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*/
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l = (p[1] << 3) | ((lsbs >> 3) & 0x7);
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q[1] = (float) l * 0.125;
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/* And b.
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*/
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l = (p[2] << 3) | (lsbs & 0x7);
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q[2] = (float) l * 0.125;
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p += 4;
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q += 3;
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}
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}
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void
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vips__LabQ2Lab_vec( float *out, VipsPel *in, int width )
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{
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vips_LabQ2Lab_line( NULL, (VipsPel *) out, &in, width );
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}
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static void
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vips_LabQ2Lab_class_init( VipsLabQ2LabClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
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object_class->nickname = "LabQ2Lab";
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object_class->description = _( "unpack a LabQ image to float Lab" );
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colour_class->process_line = vips_LabQ2Lab_line;
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}
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static void
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vips_LabQ2Lab_init( VipsLabQ2Lab *LabQ2Lab )
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{
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VipsColour *colour = VIPS_COLOUR( LabQ2Lab );
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VipsColourCode *code = VIPS_COLOUR_CODE( LabQ2Lab );
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colour->coding = VIPS_CODING_NONE;
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colour->interpretation = VIPS_INTERPRETATION_LAB;
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colour->format = VIPS_FORMAT_FLOAT;
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colour->bands = 3;
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code->input_coding = VIPS_CODING_LABQ;
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}
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/**
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* vips_LabQ2Lab:
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* @in: input image
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* @out: output image
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*
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* Unpack a LabQ (#IM_CODING_LABQ) image to a three-band float image.
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*
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* See also: im_LabQ2Lab(), im_LabQ2LabS(), im_rad2float().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_LabQ2Lab( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "LabQ2Lab", ap, in, out );
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va_end( ap );
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return( result );
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}
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