141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/* Turn XYZ to scRGB colourspace.
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*
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* 11/12/12
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* - from Yxy2XYZ.c
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* 1/7/13
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* - remove any ICC profile
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* 25/11/14
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* - oh argh, revert the above
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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 <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <math.h>
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#include <vips/vips.h>
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#include "pcolour.h"
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typedef VipsColourTransform VipsXYZ2scRGB;
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typedef VipsColourTransformClass VipsXYZ2scRGBClass;
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G_DEFINE_TYPE( VipsXYZ2scRGB, vips_XYZ2scRGB, VIPS_TYPE_COLOUR_TRANSFORM );
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/* We used to have the comment:
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* We've converted to sRGB without a profile. We must remove any ICC
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* profile left over from import or there will be a mismatch between
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* pixel values and the attached profile.
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But this isn't right, we often call things sRGB that we know are not true
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sRGB, for example:
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vips sharpen k2.jpg x.jpg
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sharpen will treat k2 as being in sRGB space even if that image has a
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profile. If we drop the profile, x.jpg is suddenly untagged.
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*/
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void
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vips_XYZ2scRGB_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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float * restrict p = (float *) in[0];
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float * restrict q = (float *) out;
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int i;
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for( i = 0; i < width; i++ ) {
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float X = p[0];
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float Y = p[1];
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float Z = p[2];
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float R, G, B;
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p += 3;
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vips_col_XYZ2scRGB( X, Y, Z, &R, &G, &B );
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q[0] = R;
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q[1] = G;
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q[2] = B;
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q += 3;
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}
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}
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static void
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vips_XYZ2scRGB_class_init( VipsXYZ2scRGBClass *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 = "XYZ2scRGB";
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object_class->description = _( "transform XYZ to scRGB" );
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colour_class->process_line = vips_XYZ2scRGB_line;
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}
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static void
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vips_XYZ2scRGB_init( VipsXYZ2scRGB *XYZ2scRGB )
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{
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VipsColour *colour = VIPS_COLOUR( XYZ2scRGB );
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colour->interpretation = VIPS_INTERPRETATION_scRGB;
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}
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/**
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* vips_XYZ2scRGB: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Turn XYZ to scRGB.
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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_XYZ2scRGB( 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( "XYZ2scRGB", ap, in, out );
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va_end( ap );
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return( result );
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}
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