/* compile with
 *
 * 	gcc -g -Wall try269.c `pkg-config vips --cflags --libs`
 *
 */

#include <stdio.h>

#include <vips/vips.h>

static int
wof_generate_packshot(VipsImage **out, VipsImage *product) {

  VipsImage *base = vips_image_new();
  VipsImage **t = (VipsImage **) vips_object_local_array(VIPS_OBJECT(base), 12);

  int width = product->Xsize;
  int height = product->Ysize;

  if (
    // resize product image in t[0]
    vips_resize( product, &t[0], 0.9, NULL ) ||

    // find pixels over 250 and feather slightly ... JPG compression arifacts
    // will typically be around this range
    //
    // bandand() ANDs all the tests together, ie. we find pixels where r AND g
    // AND b are all >250
    vips_more_const1( t[0], &t[1], 250.0, NULL ) ||
    vips_bandand( t[1], &t[2], NULL ) ||
    vips_gaussblur( t[2], &t[3], 1,
	    "precision", VIPS_PRECISION_INTEGER,
	    NULL ) ||

    /* Make the new background, and blend with our product shot.
     */
    !(t[4] = vips_image_new_from_image1( t[0], 230 )) ||
    vips_ifthenelse( t[3], t[4], t[0], &t[5],
            "blend", TRUE,
	    NULL ) ||

    /* Expand outwards with the new background colour.
     */
    vips_gravity( t[5], out, VIPS_COMPASS_DIRECTION_CENTRE, width, height,
	    "extend", VIPS_EXTEND_COPY,
	    NULL )

  ) {
    g_object_unref(base);
    return 1;
  }

  g_object_unref(base);

  return 0;
}

int
main( int argc, char **argv )
{
	int i;

	if( VIPS_INIT( argv[0] ) )
		vips_error_exit( NULL );

	for( i = 1; i < argc; i++ ) {
		VipsImage *in;
		VipsImage *x;

		printf( "loop %d ...\n", i );
		if( !(in = vips_image_new_from_file( argv[i],
			"access", VIPS_ACCESS_SEQUENTIAL,
			NULL )) )
			vips_error_exit( NULL );
		if( wof_generate_packshot( &x, in ) )
			vips_error_exit( NULL );
		if( vips_image_write_to_file( x, "x.jpg", NULL ) )
			vips_error_exit( NULL );
		g_object_unref( x );
		g_object_unref( in );
	}

	return( 0 );
}