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/* Turn displayable rgb files to scRGB.
*
* Modified:
* 15/11/94 JC
* - memory leak fixed
* - error message added
* 16/11/94 JC
* - partialed
* 21/9/12
* - redone as a class
* - sRGB only, support for other RGBs is now via lcms
* 6/11/12
* - add 16-bit sRGB import
* 11/12/12
* - cut about to make sRGB2scRGB.c
* 12/2/15
* - add 16-bit alpha handling
* 26/2/16
* - look for RGB16 tag, not just ushort, for the 16-bit path
* 24/11/17 lovell
* - special path for 3 and 4 band images
* 16/4/25
* - move on top of ColourCode
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "pcolour.h"
typedef VipsColourCode VipssRGB2scRGB;
typedef VipsColourCodeClass VipssRGB2scRGBClass;
G_DEFINE_TYPE(VipssRGB2scRGB, vips_sRGB2scRGB, VIPS_TYPE_COLOUR_CODE);
static void
vips_sRGB2scRGB_line(VipsColour *colour, VipsPel *out, VipsPel **in, int width)
{
if (colour->in[0]->BandFmt == VIPS_FORMAT_UCHAR) {
float *restrict q;
VipsPel *restrict p;
q = (float *) out;
p = in[0];
for (int i = 0; i < width; i++) {
q[0] = vips_v2Y_8[p[0]];
q[1] = vips_v2Y_8[p[1]];
q[2] = vips_v2Y_8[p[2]];
p += 3;
q += 3;
}
}
else if (colour->in[0]->BandFmt == VIPS_FORMAT_USHORT) {
float *restrict q;
unsigned short *restrict p;
q = (float *) out;
p = (unsigned short *) in[0];
for (int i = 0; i < width; i++) {
q[0] = vips_v2Y_16[p[0]];
q[1] = vips_v2Y_16[p[1]];
q[2] = vips_v2Y_16[p[2]];
p += 3;
q += 3;
}
}
else
g_assert_not_reached();
}
static int
vips_sRGB2scRGB_build(VipsObject *object)
{
VipsColour *colour = (VipsColour *) object;
VipsColourCode *code = (VipsColourCode *) object;
// input image we want
if (vips_object_argument_isset(object, "in") &&
code->in->Type == VIPS_INTERPRETATION_RGB16) {
vips_col_make_tables_RGB_16();
code->input_format = VIPS_FORMAT_USHORT;
}
else {
vips_col_make_tables_RGB_8();
code->input_format = VIPS_FORMAT_UCHAR;
}
colour->input_bands = 3;
// output image we make
colour->interpretation = VIPS_INTERPRETATION_scRGB;
colour->format = VIPS_FORMAT_FLOAT;
colour->bands = 3;
return VIPS_OBJECT_CLASS(vips_sRGB2scRGB_parent_class)->build(object);
}
static void
vips_sRGB2scRGB_class_init(VipssRGB2scRGBClass *class)
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS(class);
object_class->nickname = "sRGB2scRGB";
object_class->description = _("convert an sRGB image to scRGB");
object_class->build = vips_sRGB2scRGB_build;
colour_class->process_line = vips_sRGB2scRGB_line;
}
static void
vips_sRGB2scRGB_init(VipssRGB2scRGB *sRGB2scRGB)
{
}
/**
* vips_sRGB2scRGB: (method)
* @in: input image
* @out: (out): output image
* @...: `NULL`-terminated list of optional named arguments
*
* Convert an sRGB image to scRGB.
*
* RGB16 images are also handled.
*
* ::: seealso
* [method@Image.scRGB2XYZ], [method@Image.scRGB2sRGB],
* [method@Image.rad2float].
*
* Returns: 0 on success, -1 on error.
*/
int
vips_sRGB2scRGB(VipsImage *in, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("sRGB2scRGB", ap, in, out);
va_end(ap);
return result;
}
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