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/* Add an appropriate alpha band.
*/
/*
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 <stdlib.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "pconversion.h"
typedef struct _VipsAddAlpha {
VipsConversion parent_instance;
VipsImage *in;
} VipsAddAlpha;
typedef VipsConversionClass VipsAddAlphaClass;
G_DEFINE_TYPE(VipsAddAlpha, vips_addalpha, VIPS_TYPE_CONVERSION);
static int
vips_addalpha_build(VipsObject *object)
{
VipsAddAlpha *addalpha = (VipsAddAlpha *) object;
VipsConversion *conversion = VIPS_CONVERSION(object);
VipsImage **t = (VipsImage **) vips_object_local_array(object, 2);
double max_alpha = vips_interpretation_max_alpha(addalpha->in->Type);
if (VIPS_OBJECT_CLASS(vips_addalpha_parent_class)->build(object))
return -1;
if (vips_bandjoin_const1(addalpha->in, &t[0], max_alpha, NULL) ||
vips_image_write(t[0], conversion->out))
return -1;
return 0;
}
static void
vips_addalpha_class_init(VipsAddAlphaClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS(class);
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS(class);
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS(class);
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "addalpha";
vobject_class->description = _("append an alpha channel");
vobject_class->build = vips_addalpha_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
VIPS_ARG_IMAGE(class, "in", 0,
_("Input"),
_("Input image"),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET(VipsAddAlpha, in));
}
static void
vips_addalpha_init(VipsAddAlpha *addalpha)
{
}
/**
* vips_addalpha: (method)
* @in: input image
* @out: (out): output image
* @...: %NULL-terminated list of optional named arguments
*
* Append an alpha channel.
*
* See also: vips_image_hasalpha().
*
* Returns: 0 on success, -1 on error
*/
int
vips_addalpha(VipsImage *in, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("addalpha", ap, in, out);
va_end(ap);
return result;
}
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