330 lines
7.2 KiB
C
330 lines
7.2 KiB
C
/* Turn displayable rgb files to scRGB.
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*
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* Modified:
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* 15/11/94 JC
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* - memory leak fixed
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* - error message added
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* 16/11/94 JC
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* - partialed
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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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* - add 16-bit sRGB import
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* 11/12/12
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* - cut about to make sRGB2scRGB.c
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* 12/2/15
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* - add 16-bit alpha handling
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* 26/2/16
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* - look for RGB16 tag, not just ushort, for the 16-bit path
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* 24/11/17 lovell
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* - special path for 3 and 4 band images
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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 _VipssRGB2scRGB {
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VipsOperation parent_instance;
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VipsImage *in;
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VipsImage *out;
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} VipssRGB2scRGB;
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typedef VipsOperationClass VipssRGB2scRGBClass;
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G_DEFINE_TYPE( VipssRGB2scRGB, vips_sRGB2scRGB, VIPS_TYPE_OPERATION );
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/* Convert a buffer of 8-bit pixels.
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*/
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static void
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vips_sRGB2scRGB_line_8( float * restrict q, VipsPel * 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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if( extra_bands == 0 ) {
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for( i = 0; i < width; i++ ) {
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q[0] = vips_v2Y_8[p[0]];
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q[1] = vips_v2Y_8[p[1]];
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q[2] = vips_v2Y_8[p[2]];
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p += 3;
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q += 3;
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}
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}
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else if( extra_bands == 1 ) {
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for( i = 0; i < width; i++ ) {
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q[0] = vips_v2Y_8[p[0]];
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q[1] = vips_v2Y_8[p[1]];
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q[2] = vips_v2Y_8[p[2]];
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q[3] = p[3];
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p += 4;
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q += 4;
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}
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}
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else {
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for( i = 0; i < width; i++ ) {
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q[0] = vips_v2Y_8[p[0]];
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q[1] = vips_v2Y_8[p[1]];
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q[2] = vips_v2Y_8[p[2]];
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p += 3;
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q += 3;
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for( j = 0; j < extra_bands; j++ )
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q[j] = p[j];
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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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}
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/* Convert a buffer of 16-bit pixels.
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*/
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static void
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vips_sRGB2scRGB_line_16( float * restrict q, unsigned short * 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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if( extra_bands == 0 ) {
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for( i = 0; i < width; i++ ) {
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q[0] = vips_v2Y_16[p[0]];
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q[1] = vips_v2Y_16[p[1]];
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q[2] = vips_v2Y_16[p[2]];
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p += 3;
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q += 3;
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}
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}
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else if( extra_bands == 1 ) {
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for( i = 0; i < width; i++ ) {
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q[0] = vips_v2Y_16[p[0]];
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q[1] = vips_v2Y_16[p[1]];
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q[2] = vips_v2Y_16[p[2]];
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q[3] = p[3] / 256.0;
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p += 4;
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q += 4;
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}
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}
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else {
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for( i = 0; i < width; i++ ) {
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q[0] = vips_v2Y_16[p[0]];
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q[1] = vips_v2Y_16[p[1]];
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q[2] = vips_v2Y_16[p[2]];
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p += 3;
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q += 3;
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for( j = 0; j < extra_bands; j++ )
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q[j] = p[j] / 256.0;
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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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}
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static int
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vips_sRGB2scRGB_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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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_sRGB2scRGB_gen: work" );
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if( in->BandFmt == VIPS_FORMAT_UCHAR ) {
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vips_col_make_tables_RGB_8();
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for( y = 0; y < r->height; y++ ) {
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VipsPel *p = VIPS_REGION_ADDR( ir, r->left, r->top + y );
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float *q = (float *)
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VIPS_REGION_ADDR( or, r->left, r->top + y );
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vips_sRGB2scRGB_line_8( q, p, in->Bands - 3, r->width );
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}
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}
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else {
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vips_col_make_tables_RGB_16();
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for( y = 0; y < r->height; y++ ) {
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VipsPel *p = VIPS_REGION_ADDR( ir, r->left, r->top + y );
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float *q = (float *)
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VIPS_REGION_ADDR( or, r->left, r->top + y );
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vips_sRGB2scRGB_line_16( q, (unsigned short *) p,
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in->Bands - 3, r->width );
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}
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}
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VIPS_GATE_STOP( "vips_sRGB2scRGB_gen: work" );
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return( 0 );
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}
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static int
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vips_sRGB2scRGB_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipssRGB2scRGB *sRGB2scRGB = (VipssRGB2scRGB *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
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VipsImage *in;
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VipsImage *out;
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VipsBandFormat format;
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if( VIPS_OBJECT_CLASS( vips_sRGB2scRGB_parent_class )->
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build( object ) )
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return( -1 );
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in = sRGB2scRGB->in;
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if( vips_check_bands_atleast( class->nickname, in, 3 ) )
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return( -1 );
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format = in->Type == VIPS_INTERPRETATION_RGB16 ?
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VIPS_FORMAT_USHORT : VIPS_FORMAT_UCHAR;
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if( in->BandFmt != format ) {
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if( vips_cast( in, &t[0], format, NULL ) )
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return( -1 );
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}
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else {
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t[0] = in;
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g_object_ref( t[0] );
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}
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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 = VIPS_INTERPRETATION_scRGB;
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out->BandFmt = VIPS_FORMAT_FLOAT;
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if( vips_image_generate( out,
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vips_start_one, vips_sRGB2scRGB_gen, vips_stop_one,
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in, sRGB2scRGB ) ) {
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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_sRGB2scRGB_class_init( VipssRGB2scRGBClass *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 = "sRGB2scRGB";
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object_class->description = _( "convert an sRGB image to scRGB" );
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object_class->build = vips_sRGB2scRGB_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( VipssRGB2scRGB, 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( VipssRGB2scRGB, out ) );
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}
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static void
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vips_sRGB2scRGB_init( VipssRGB2scRGB *sRGB2scRGB )
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{
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}
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/**
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* vips_sRGB2scRGB: (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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* Convert an sRGB image to scRGB. The input image can be 8 or 16-bit.
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*
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* If the input image is tagged as #VIPS_INTERPRETATION_RGB16, any extra
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* channels after RGB are divided by 256. Thus, scRGB alpha is
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* always 0 - 255.99.
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*
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* See also: vips_scRGB2XYZ(), vips_scRGB2sRGB(), 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_sRGB2scRGB( 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( "sRGB2scRGB", ap, in, out );
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va_end( ap );
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return( result );
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}
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