321 lines
7.0 KiB
C
321 lines
7.0 KiB
C
/* Turn scRGB files into displayable rgb.
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*
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* Author: J-P. Laurent
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* Modified:
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* 15/11/94 JC
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* - error message added
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* - out->Type set to IM_TYPE_RGB
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* - memory leak fixed
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* 16/11/94 JC
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* - uses im_wrapone()
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* 15/2/95 JC
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* - oops! now uses PEL, not float for output pointer
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* 2/1/96 JC
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* - sometimes produced incorrect result at extrema
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* - reformatted
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* - now uses IM_RINT() and clip()
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* 18/9/96 JC
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* - some speed-ups ... 3x faster
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* - slightly less accurate, but who cares
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* - added out-of-mem check for table build
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* 21/9/12
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* - redone as a class
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* - sRGB only, support for other RGBs is now via lcms
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* 6/11/12
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* - added 16-bit option
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* 11/12/12
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* - cut about to make scRGB2sRGB.c
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* 12/2/15
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* - add 16-bit alpha handling
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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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/* We can't use VipsColourCode as our parent class. We want to handle
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* alpha ourselves so we can get 16 -> 8 bit conversion right.
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*/
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typedef struct _VipsscRGB2sRGB {
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VipsOperation parent_instance;
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VipsImage *in;
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VipsImage *out;
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int depth;
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} VipsscRGB2sRGB;
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typedef VipsOperationClass VipsscRGB2sRGBClass;
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G_DEFINE_TYPE( VipsscRGB2sRGB, vips_scRGB2sRGB, VIPS_TYPE_OPERATION );
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/* Process a buffer of data.
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*/
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static void
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vips_scRGB2sRGB_line_8( VipsPel * restrict q, float * restrict p,
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int extra_bands, int width )
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{
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int i, j;
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for( i = 0; i < width; i++ ) {
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float R = p[0];
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float G = p[1];
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float B = p[2];
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int r, g, b;
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vips_col_scRGB2sRGB_8( R, G, B, &r, &g, &b, NULL );
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p += 3;
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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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for( j = 0; j < extra_bands; j++ )
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q[j] = VIPS_CLIP( 0, p[j], UCHAR_MAX );
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p += extra_bands;
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q += extra_bands;
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}
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}
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static void
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vips_scRGB2sRGB_line_16( unsigned short * restrict q, float * restrict p,
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int extra_bands, int width )
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{
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int i, j;
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for( i = 0; i < width; i++ ) {
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float R = p[0];
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float G = p[1];
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float B = p[2];
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int r, g, b;
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vips_col_scRGB2sRGB_16( R, G, B, &r, &g, &b, NULL );
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p += 3;
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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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for( j = 0; j < extra_bands; j++ )
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q[j] = VIPS_CLIP( 0, (int) (p[j] * 256.0), USHRT_MAX );
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p += extra_bands;
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q += extra_bands;
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}
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}
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static int
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vips_scRGB2sRGB_gen( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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VipsscRGB2sRGB *scRGB2sRGB = (VipsscRGB2sRGB *) b;
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VipsRect *r = &or->valid;
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VipsImage *in = ir->im;
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int y;
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if( vips_region_prepare( ir, r ) )
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return( -1 );
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VIPS_GATE_START( "vips_scRGB2sRGB_gen: work" );
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for( y = 0; y < r->height; y++ ) {
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float *p = (float *)
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VIPS_REGION_ADDR( ir, r->left, r->top + y );
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VipsPel *q = (VipsPel *)
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VIPS_REGION_ADDR( or, r->left, r->top + y );
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if( scRGB2sRGB->depth == 16 )
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vips_scRGB2sRGB_line_16( (unsigned short *) q, p,
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in->Bands - 3, r->width );
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else
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vips_scRGB2sRGB_line_8( q, p,
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in->Bands - 3, r->width );
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}
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VIPS_GATE_STOP( "vips_scRGB2sRGB_gen: work" );
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return( 0 );
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}
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static int
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vips_scRGB2sRGB_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsscRGB2sRGB *scRGB2sRGB = (VipsscRGB2sRGB *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
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VipsImage *in;
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VipsBandFormat format;
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VipsInterpretation interpretation;
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VipsImage *out;
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if( VIPS_OBJECT_CLASS( vips_scRGB2sRGB_parent_class )->build( object ) )
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return( -1 );
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in = scRGB2sRGB->in;
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if( vips_check_bands_atleast( class->nickname, in, 3 ) )
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return( -1 );
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switch( scRGB2sRGB->depth ) {
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case 16:
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interpretation = VIPS_INTERPRETATION_RGB16;
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format = VIPS_FORMAT_USHORT;
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break;
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case 8:
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interpretation = VIPS_INTERPRETATION_sRGB;
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format = VIPS_FORMAT_UCHAR;
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break;
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default:
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vips_error( class->nickname,
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"%s", _( "depth must be 8 or 16" ) );
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return( -1 );
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}
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if( vips_cast_float( in, &t[0], NULL ) )
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return( -1 );
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in = t[0];
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out = vips_image_new();
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if( vips_image_pipelinev( out,
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VIPS_DEMAND_STYLE_THINSTRIP, in, NULL ) ) {
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g_object_unref( out );
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return( -1 );
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}
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out->Type = interpretation;
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out->BandFmt = format;
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if( vips_image_generate( out,
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vips_start_one, vips_scRGB2sRGB_gen, vips_stop_one,
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in, scRGB2sRGB ) ) {
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g_object_unref( out );
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return( -1 );
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}
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g_object_set( object, "out", out, NULL );
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return( 0 );
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}
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static void
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vips_scRGB2sRGB_class_init( VipsscRGB2sRGBClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "scRGB2sRGB";
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object_class->description = _( "convert an scRGB image to sRGB" );
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object_class->build = vips_scRGB2sRGB_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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VIPS_ARG_IMAGE( class, "in", 1,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsscRGB2sRGB, in ) );
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VIPS_ARG_IMAGE( class, "out", 100,
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_( "Output" ),
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_( "Output image" ),
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VIPS_ARGUMENT_REQUIRED_OUTPUT,
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G_STRUCT_OFFSET( VipsscRGB2sRGB, out ) );
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VIPS_ARG_INT( class, "depth", 130,
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_( "Depth" ),
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_( "Output device space depth in bits" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsscRGB2sRGB, depth ),
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8, 16, 8 );
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}
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static void
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vips_scRGB2sRGB_init( VipsscRGB2sRGB *scRGB2sRGB )
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{
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scRGB2sRGB->depth = 8;
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}
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/**
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* vips_scRGB2sRGB: (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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* Optional arguments:
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*
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* * @depth: depth of output image in bits
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*
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* Convert an scRGB image to sRGB. Set @depth to 16 to get 16-bit output.
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*
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* If @depth is 16, any extra channels after RGB are
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* multiplied by 256.
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*
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* See also: vips_LabS2LabQ(), vips_sRGB2scRGB(), vips_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_scRGB2sRGB( 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( "scRGB2sRGB", ap, in, out );
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va_end( ap );
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return( result );
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}
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