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/* im_system_image(): run a command on an image, get an image result
*
* 8/1/09
* - from im_system()
* 2/2/10
* - gtkdoc
*/
/*
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /*HAVE_UNISTD_H*/
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <vips/vips.h>
#define IM_MAX_STRSIZE (4096)
static int
system_image( IMAGE *im,
IMAGE *in_image, char *out_name, const char *cmd_format,
char **log )
{
const char *in_name = in_image->filename;
FILE *fp;
char line[IM_MAX_STRSIZE];
char txt[IM_MAX_STRSIZE];
VipsBuf buf = VIPS_BUF_STATIC( txt );
int result;
if( im_copy( im, in_image ) ||
!(fp = im_popenf( cmd_format, "r", in_name, out_name )) )
return( -1 );
while( fgets( line, IM_MAX_STRSIZE, fp ) )
if( !vips_buf_appends( &buf, line ) )
break;
if( (result = pclose( fp )) )
im_error( "im_system_image",
_( "command failed: \"%s\"" ), cmd_format );
if( log )
*log = im_strdup( NULL, vips_buf_all( &buf ) );
return( result );
}
/**
* im_system_image:
* @im: image to run command on
* @in_format: write input file like this
* @out_format: write output filename like this
* @cmd_format: command to run
* @log: stdout of command is returned here
*
* im_system_image() runs a command, passing an image in and getting an image
* back. The command's stdout is returned in @log.
*
* First, @im is written to a file. The filename is formed by substituting
* something like "vips-49857-1" for the first %%s in @in_format, then
* prepending "/tmp". If the environment variable TMPDIR is defined, it
* can be used to set a different temporary directory. If @in_format is
* something like "%%s.png", the file will be written in PNG format.
*
* On Windows, if the environment variable TMPDIR is not defined, VIPS calls
* GetTempPath() to get the user's preferred temporary area. If that fails, it
* defaults to C:\temp.
*
* Next an output filename is created in the same way using @out_format. The
* command string to run is made by substituting the first %%s in @cmd_format
* for the name of the input file and the second %%s for the output filename.
*
* The command is executed with popen() and the output captured in @log. If
* the command fails, the temporary files are deleted and im_system_image()
* returns NULL. @log is still set.
*
* If the command succeeds, the input file is deleted, the output file opened,
* and returned. Closing the output image will automatically delete the file.
*
* In all cases, @log must be freed with im_free().
*
* For example, this call will run the ImageMagick convert program on an
* image, using JPEG files to pass images into and out of the convert command.
*
* |[
* im_system_image( in, out,
* "%s.jpg", "%s.jpg", "convert %s -swirl 45 %s",
* &log )
* ]|
*
* See also: im_system().
*
* Returns: (transfer full): an image on success, NULL on error
*/
IMAGE *
im_system_image( IMAGE *im,
const char *in_format, const char *out_format, const char *cmd_format,
char **log )
{
IMAGE *in_image;
char *out_name;
IMAGE *out;
if( log )
*log = NULL;
if( !(in_image = im__open_temp( in_format )) )
return( NULL );
if( !(out_name = im__temp_name( out_format )) ) {
im_close( in_image );
return( NULL );
}
if( system_image( im, in_image, out_name, cmd_format, log ) ) {
im_close( in_image );
g_free( out_name );
g_unlink( out_name );
return( NULL );
}
im_close( in_image );
if( !(out = im_open( out_name, "r" )) ) {
g_free( out_name );
g_unlink( out_name );
return( NULL );
}
g_free( out_name );
vips_image_set_delete_on_close( out, TRUE );
return( out );
}
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