libvips/libvips/foreign/ppmsave.c

833 lines
20 KiB
C

/* save to ppm
*
* 2/12/11
* - wrap a class around the ppm writer
* 13/11/19
* - redone with targets
* 18/6/20
* - add "bitdepth" param, cf. tiffsave
* 27/6/20
* - add ppmsave_target
* 20/11/20
* - byteswap on save, if necessary [ewelot]
* 2/12/20
* - don't add date with @strip [ewelot]
* 28/10/21
* - add @format, default type by filename
* 30/8/22
* - add ".pnm", save as image format [ewelot]
*/
/*
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
*/
/*
#define DEBUG_VERBOSE
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "pforeign.h"
#ifdef HAVE_PPM
typedef struct _VipsForeignSavePpm VipsForeignSavePpm;
typedef int (*VipsSavePpmFn)( VipsForeignSavePpm *, VipsImage *, VipsPel * );
struct _VipsForeignSavePpm {
VipsForeignSave parent_object;
VipsTarget *target;
VipsForeignPpmFormat format;
gboolean ascii;
int bitdepth;
VipsSavePpmFn fn;
/* Deprecated.
*/
gboolean squash;
};
typedef VipsForeignSaveClass VipsForeignSavePpmClass;
G_DEFINE_ABSTRACT_TYPE( VipsForeignSavePpm, vips_foreign_save_ppm,
VIPS_TYPE_FOREIGN_SAVE );
static void
vips_foreign_save_ppm_dispose( GObject *gobject )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) gobject;
VIPS_UNREF( ppm->target );
G_OBJECT_CLASS( vips_foreign_save_ppm_parent_class )->
dispose( gobject );
}
static int
vips_foreign_save_ppm_line_ascii( VipsForeignSavePpm *ppm,
VipsImage *image, VipsPel *p )
{
const int n_elements = image->Xsize * image->Bands;
int i;
for( i = 0; i < n_elements; i++ ) {
switch( image->BandFmt ) {
case VIPS_FORMAT_UCHAR:
vips_target_writef( ppm->target,
"%d ", p[i] );
break;
case VIPS_FORMAT_USHORT:
vips_target_writef( ppm->target,
"%d ", ((unsigned short *) p)[i] );
break;
case VIPS_FORMAT_UINT:
vips_target_writef( ppm->target,
"%d ", ((unsigned int *) p)[i] );
break;
default:
g_assert_not_reached();
}
}
if( vips_target_writes( ppm->target, "\n" ) )
return( -1 );
return( 0 );
}
static int
vips_foreign_save_ppm_line_ascii_1bit( VipsForeignSavePpm *ppm,
VipsImage *image, VipsPel *p )
{
int x;
for( x = 0; x < image->Xsize; x++ )
vips_target_writef( ppm->target, "%d ", p[x] ? 0 : 1 );
if( vips_target_writes( ppm->target, "\n" ) )
return( -1 );
return( 0 );
}
static int
vips_foreign_save_ppm_line_binary( VipsForeignSavePpm *ppm,
VipsImage *image, VipsPel *p )
{
if( vips_target_write( ppm->target,
p, VIPS_IMAGE_SIZEOF_LINE( image ) ) )
return( -1 );
return( 0 );
}
static int
vips_foreign_save_ppm_line_binary_1bit( VipsForeignSavePpm *ppm,
VipsImage *image, VipsPel *p )
{
int x;
int bits;
int n_bits;
bits = 0;
n_bits = 0;
for( x = 0; x < image->Xsize; x++ ) {
bits = VIPS_LSHIFT_INT( bits, 1 );
n_bits += 1;
bits |= p[x] > 128 ? 0 : 1;
if( n_bits == 8 ) {
if( VIPS_TARGET_PUTC( ppm->target, bits ) )
return( -1 );
bits = 0;
n_bits = 0;
}
}
/* Flush any remaining bits in this line.
*/
if( n_bits &&
VIPS_TARGET_PUTC( ppm->target, bits ) )
return( -1 );
return( 0 );
}
static int
vips_foreign_save_ppm_block( VipsRegion *region, VipsRect *area, void *a )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) a;
VipsImage *image = region->im;
int y;
for( y = 0; y < area->height; y++ ) {
VipsPel *p = VIPS_REGION_ADDR( region, 0, area->top + y );
if( ppm->fn( ppm, image, p ) )
return( -1 );
}
return( 0 );
}
static int
vips_foreign_save_ppm_build( VipsObject *object )
{
VipsForeignSave *save = (VipsForeignSave *) object;
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
VipsImage *image;
char *magic;
char *date;
VipsBandFormat target_format;
VipsInterpretation target_interpretation;
if( VIPS_OBJECT_CLASS( vips_foreign_save_ppm_parent_class )->
build( object ) )
return( -1 );
image = save->ready;
target_format = image->BandFmt;
target_interpretation = image->Type;
/* ppm types to set the defaults for bitdepth etc.
*
* pbm ... 1 band 1 bit
* pgm ... 1 band many bit
* ppm ... 3 band many bit
* pfm ... 1 or 3 bands, 32 bit
* pnm ... pick from input
*/
switch( ppm->format ) {
case VIPS_FOREIGN_PPM_FORMAT_PBM:
if( !vips_object_argument_isset( object, "bitdepth" ) )
ppm->bitdepth = 1;
target_interpretation = VIPS_INTERPRETATION_B_W;
break;
case VIPS_FOREIGN_PPM_FORMAT_PGM:
if( target_format == VIPS_FORMAT_USHORT )
target_interpretation = VIPS_INTERPRETATION_GREY16;
else
target_interpretation = VIPS_INTERPRETATION_B_W;
break;
case VIPS_FOREIGN_PPM_FORMAT_PPM:
if( target_format == VIPS_FORMAT_USHORT )
target_interpretation = VIPS_INTERPRETATION_RGB16;
else
target_interpretation = VIPS_INTERPRETATION_sRGB;
break;
case VIPS_FOREIGN_PPM_FORMAT_PFM:
target_format = VIPS_FORMAT_FLOAT;
break;
case VIPS_FOREIGN_PPM_FORMAT_PNM:
default:
/* Just use the input format and interpretation.
*/
break;
}
if( vips_cast( image, &t[0], target_format, NULL ) )
return( -1 );
image = t[0];
if( image->Type != target_interpretation ) {
if( vips_colourspace( image, &t[1],
target_interpretation, NULL ) )
return( -1 );
image = t[1];
}
/* Handle the deprecated squash parameter.
*/
if( vips_object_argument_isset( object, "squash" ) )
ppm->bitdepth = 1;
if( vips_check_uintorf( "vips2ppm", image ) ||
vips_check_bands_1or3( "vips2ppm", image ) ||
vips_check_uncoded( "vips2ppm", image ) ||
vips_image_pio_input( image ) )
return( -1 );
if( ppm->ascii &&
image->BandFmt == VIPS_FORMAT_FLOAT ) {
g_warning( "%s",
_( "float images must be binary -- disabling ascii" ) );
ppm->ascii = FALSE;
}
/* One bit images must come from a 8 bit, one band source.
*/
if( ppm->bitdepth &&
(image->Bands != 1 ||
image->BandFmt != VIPS_FORMAT_UCHAR) ) {
g_warning( "%s",
_( "can only save 1 band uchar images as 1 bit -- "
"disabling 1 bit save" ) );
ppm->bitdepth = 0;
}
magic = "unset";
if( image->BandFmt == VIPS_FORMAT_FLOAT &&
image->Bands == 3 )
magic = "PF";
else if( image->BandFmt == VIPS_FORMAT_FLOAT &&
image->Bands == 1 )
magic = "Pf";
else if( image->Bands == 1 &&
ppm->ascii &&
ppm->bitdepth )
magic = "P1";
else if( image->Bands == 1 &&
ppm->ascii )
magic = "P2";
else if( image->Bands == 1 &&
!ppm->ascii &&
ppm->bitdepth )
magic = "P4";
else if( image->Bands == 1 &&
!ppm->ascii )
magic = "P5";
else if( image->Bands == 3 &&
ppm->ascii )
magic = "P3";
else if( image->Bands == 3 &&
!ppm->ascii )
magic = "P6";
else
g_assert_not_reached();
vips_target_writef( ppm->target, "%s\n", magic );
if( !save->strip ) {
date = vips__get_iso8601();
vips_target_writef( ppm->target,
"#vips2ppm - %s\n", date );
g_free( date );
}
vips_target_writef( ppm->target,
"%d %d\n", image->Xsize, image->Ysize );
if( !ppm->bitdepth )
switch( image->BandFmt ) {
case VIPS_FORMAT_UCHAR:
vips_target_writef( ppm->target,
"%d\n", UCHAR_MAX );
break;
case VIPS_FORMAT_USHORT:
vips_target_writef( ppm->target,
"%d\n", USHRT_MAX );
break;
case VIPS_FORMAT_UINT:
vips_target_writef( ppm->target,
"%d\n", UINT_MAX );
break;
case VIPS_FORMAT_FLOAT:
{
double scale;
char buf[G_ASCII_DTOSTR_BUF_SIZE];
scale = 1;
if( vips_image_get_typeof( image, "pfm-scale" ) &&
!vips_image_get_double( image,
"pfm-scale", &scale ) )
;
if( !vips_amiMSBfirst() )
scale *= -1;
/* Need to be locale independent.
*/
g_ascii_dtostr( buf, G_ASCII_DTOSTR_BUF_SIZE, scale );
vips_target_writes( ppm->target, buf );
vips_target_writes( ppm->target, "\n" );
}
break;
default:
g_assert_not_reached();
}
if( ppm->bitdepth )
ppm->fn = ppm->ascii ?
vips_foreign_save_ppm_line_ascii_1bit :
vips_foreign_save_ppm_line_binary_1bit;
else
ppm->fn = ppm->ascii ?
vips_foreign_save_ppm_line_ascii :
vips_foreign_save_ppm_line_binary;
/* 16 and 32-bit binary write might need byteswapping.
*/
if( !ppm->ascii &&
(image->BandFmt == VIPS_FORMAT_USHORT ||
image->BandFmt == VIPS_FORMAT_UINT) ) {
VipsImage *x;
if( vips__byteswap_bool( image, &x, !vips_amiMSBfirst() ) )
return( -1 );
image = x;
/* image must now be unreffed on exit.
*/
vips_object_local( VIPS_OBJECT( ppm->target ), image );
}
if( vips_sink_disc( image, vips_foreign_save_ppm_block, ppm ) )
return( -1 );
if( vips_target_end( ppm->target ) )
return( -1 );
return( 0 );
}
/* Save a bit of typing.
*/
#define UC VIPS_FORMAT_UCHAR
#define C VIPS_FORMAT_CHAR
#define US VIPS_FORMAT_USHORT
#define S VIPS_FORMAT_SHORT
#define UI VIPS_FORMAT_UINT
#define I VIPS_FORMAT_INT
#define F VIPS_FORMAT_FLOAT
#define X VIPS_FORMAT_COMPLEX
#define D VIPS_FORMAT_DOUBLE
#define DX VIPS_FORMAT_DPCOMPLEX
static VipsBandFormat bandfmt_ppm[10] = {
/* Band format: UC C US S UI I F X D DX */
/* Promotion: */ UC, UC, US, US, UI, UI, F, F, F, F
};
static void
vips_foreign_save_ppm_class_init( VipsForeignSavePpmClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignSaveClass *save_class = (VipsForeignSaveClass *) class;
gobject_class->dispose = vips_foreign_save_ppm_dispose;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "ppmsave_base";
object_class->description = _( "save to ppm" );
object_class->build = vips_foreign_save_ppm_build;
save_class->saveable = VIPS_SAVEABLE_RGB;
save_class->format_table = bandfmt_ppm;
VIPS_ARG_ENUM( class, "format", 2,
_( "Format" ),
_( "Format to save in" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSavePpm, format ),
VIPS_TYPE_FOREIGN_PPM_FORMAT,
VIPS_FOREIGN_PPM_FORMAT_PPM );
VIPS_ARG_BOOL( class, "ascii", 10,
_( "ASCII" ),
_( "Save as ascii" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSavePpm, ascii ),
FALSE );
VIPS_ARG_INT( class, "bitdepth", 15,
_( "Bit depth" ),
_( "Set to 1 to write as a 1 bit image" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignSavePpm, bitdepth ),
0, 1, 0 );
VIPS_ARG_BOOL( class, "squash", 11,
_( "Squash" ),
_( "Save as one bit" ),
VIPS_ARGUMENT_OPTIONAL_INPUT | VIPS_ARGUMENT_DEPRECATED,
G_STRUCT_OFFSET( VipsForeignSavePpm, squash ),
FALSE );
}
static void
vips_foreign_save_ppm_init( VipsForeignSavePpm *ppm )
{
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PPM;
}
typedef struct _VipsForeignSavePpmFile {
VipsForeignSavePpm parent_object;
char *filename;
} VipsForeignSavePpmFile;
typedef VipsForeignSavePpmClass VipsForeignSavePpmFileClass;
G_DEFINE_TYPE( VipsForeignSavePpmFile, vips_foreign_save_ppm_file,
vips_foreign_save_ppm_get_type() );
static int
vips_foreign_save_ppm_file_build( VipsObject *object )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) object;
VipsForeignSavePpmFile *file = (VipsForeignSavePpmFile *) object;
if( file->filename &&
!(ppm->target = vips_target_new_to_file( file->filename )) )
return( -1 );
if( vips_iscasepostfix( file->filename, ".pbm" ) )
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PBM;
else if( vips_iscasepostfix( file->filename, ".pgm" ) )
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PGM;
else if( vips_iscasepostfix( file->filename, ".pfm" ) )
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PFM;
else if( vips_iscasepostfix( file->filename, ".pnm" ) )
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PNM;
return( VIPS_OBJECT_CLASS( vips_foreign_save_ppm_file_parent_class )->
build( object ) );
}
static void
vips_foreign_save_ppm_file_class_init( VipsForeignSavePpmFileClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "ppmsave";
object_class->description = _( "save image to ppm file" );
object_class->build = vips_foreign_save_ppm_file_build;
foreign_class->suffs = vips__ppm_suffs;
VIPS_ARG_STRING( class, "filename", 1,
_( "Filename" ),
_( "Filename to save to" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignSavePpmFile, filename ),
NULL );
}
static void
vips_foreign_save_ppm_file_init( VipsForeignSavePpmFile *file )
{
}
typedef struct _VipsForeignSavePpmTarget {
VipsForeignSavePpm parent_object;
VipsTarget *target;
} VipsForeignSavePpmTarget;
typedef VipsForeignSavePpmClass VipsForeignSavePpmTargetClass;
G_DEFINE_TYPE( VipsForeignSavePpmTarget, vips_foreign_save_ppm_target,
vips_foreign_save_ppm_get_type() );
static int
vips_foreign_save_ppm_target_build( VipsObject *object )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) object;
VipsForeignSavePpmTarget *target =
(VipsForeignSavePpmTarget *) object;
if( target->target ) {
ppm->target = target->target;
g_object_ref( ppm->target );
}
return( VIPS_OBJECT_CLASS(
vips_foreign_save_ppm_target_parent_class )->
build( object ) );
}
static void
vips_foreign_save_ppm_target_class_init(
VipsForeignSavePpmTargetClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "ppmsave_target";
object_class->build = vips_foreign_save_ppm_target_build;
foreign_class->suffs = vips__save_ppm_suffs;
VIPS_ARG_OBJECT( class, "target", 1,
_( "Target" ),
_( "Target to save to" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignSavePpmTarget, target ),
VIPS_TYPE_TARGET );
}
static void
vips_foreign_save_ppm_target_init( VipsForeignSavePpmTarget *target )
{
}
typedef VipsForeignSavePpmTarget VipsForeignSavePbmTarget;
typedef VipsForeignSavePpmTargetClass VipsForeignSavePbmTargetClass;
G_DEFINE_TYPE( VipsForeignSavePbmTarget, vips_foreign_save_pbm_target,
vips_foreign_save_ppm_target_get_type() );
static void
vips_foreign_save_pbm_target_class_init(
VipsForeignSavePbmTargetClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsOperationClass *operation_class = (VipsOperationClass *) class;
object_class->nickname = "pbmsave_target";
object_class->description = _( "save image in pbm format" );
foreign_class->suffs = vips__save_pbm_suffs;
/* Hide from UI.
*/
operation_class->flags |= VIPS_OPERATION_DEPRECATED;
}
static void
vips_foreign_save_pbm_target_init( VipsForeignSavePbmTarget *target )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) target;
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PBM;
}
typedef VipsForeignSavePpmTarget VipsForeignSavePgmTarget;
typedef VipsForeignSavePpmTargetClass VipsForeignSavePgmTargetClass;
G_DEFINE_TYPE( VipsForeignSavePgmTarget, vips_foreign_save_pgm_target,
vips_foreign_save_ppm_target_get_type() );
static void
vips_foreign_save_pgm_target_class_init(
VipsForeignSavePgmTargetClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsOperationClass *operation_class = (VipsOperationClass *) class;
object_class->nickname = "pgmsave_target";
object_class->description = _( "save image in pgm format" );
foreign_class->suffs = vips__save_pgm_suffs;
/* Hide from UI.
*/
operation_class->flags |= VIPS_OPERATION_DEPRECATED;
}
static void
vips_foreign_save_pgm_target_init( VipsForeignSavePgmTarget *target )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) target;
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PGM;
}
typedef VipsForeignSavePpmTarget VipsForeignSavePfmTarget;
typedef VipsForeignSavePpmTargetClass VipsForeignSavePfmTargetClass;
G_DEFINE_TYPE( VipsForeignSavePfmTarget, vips_foreign_save_pfm_target,
vips_foreign_save_ppm_target_get_type() );
static void
vips_foreign_save_pfm_target_class_init(
VipsForeignSavePfmTargetClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsOperationClass *operation_class = (VipsOperationClass *) class;
object_class->nickname = "pfmsave_target";
object_class->description = _( "save image in pfm format" );
foreign_class->suffs = vips__save_pfm_suffs;
/* Hide from UI.
*/
operation_class->flags |= VIPS_OPERATION_DEPRECATED;
}
static void
vips_foreign_save_pfm_target_init( VipsForeignSavePfmTarget *target )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) target;
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PFM;
}
typedef VipsForeignSavePpmTarget VipsForeignSavePnmTarget;
typedef VipsForeignSavePpmTargetClass VipsForeignSavePnmTargetClass;
G_DEFINE_TYPE( VipsForeignSavePnmTarget, vips_foreign_save_pnm_target,
vips_foreign_save_ppm_target_get_type() );
static void
vips_foreign_save_pnm_target_class_init(
VipsForeignSavePfmTargetClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsOperationClass *operation_class = (VipsOperationClass *) class;
object_class->nickname = "pnmsave_target";
object_class->description = _( "save image in pnm format" );
foreign_class->suffs = vips__save_pnm_suffs;
/* Hide from UI.
*/
operation_class->flags |= VIPS_OPERATION_DEPRECATED;
}
static void
vips_foreign_save_pnm_target_init( VipsForeignSavePfmTarget *target )
{
VipsForeignSavePpm *ppm = (VipsForeignSavePpm *) target;
ppm->format = VIPS_FOREIGN_PPM_FORMAT_PNM;
}
#endif /*HAVE_PPM*/
/**
* vips_ppmsave: (method)
* @in: image to save
* @filename: file to write to
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @format: #VipsForeignPpmFormat, format to save in
* * @ascii: %gboolean, save as ASCII rather than binary
* * @bitdepth: %gint, bitdepth to save at
*
* Write a VIPS image to a file as PPM. It can write 1, 8, 16 or
* 32 bit unsigned integer images, float images, colour or monochrome,
* stored as binary or ASCII.
* Integer images of more than 8 bits can only be stored in ASCII.
*
* When writing float (PFM) images the scale factor is set from the
* "pfm-scale" metadata.
*
* Set @ascii to %TRUE to write as human-readable ASCII. Normally data is
* written in binary.
*
* Set @bitdepth to 1 to write a one-bit image.
*
* @format defaults to the sub-type for this filename suffix.
*
* See also: vips_image_write_to_file().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_ppmsave( VipsImage *in, const char *filename, ... )
{
va_list ap;
int result;
va_start( ap, filename );
result = vips_call_split( "ppmsave", ap, in, filename );
va_end( ap );
return( result );
}
/**
* vips_ppmsave_target: (method)
* @in: image to save
* @target: save image to this target
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @format: #VipsForeignPpmFormat, format to save in
* * @ascii: %gboolean, save as ASCII rather than binary
* * @bitdepth: %gint, bitdepth to save at
*
* As vips_ppmsave(), but save to a target.
*
* See also: vips_ppmsave().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_ppmsave_target( VipsImage *in, VipsTarget *target, ... )
{
va_list ap;
int result;
va_start( ap, target );
result = vips_call_split( "ppmsave_target", ap, in, target );
va_end( ap );
return( result );
}