C++ (Cpp) vips_pngsave_buffer Examples

Example #1

File: dzsave.c Project: eeertekin/libvips

static int
write_blank( VipsForeignSaveDz *dz )
{
	VipsImage *x, *t;
	int n;
	VipsArea *ones;
	double *d;
	int i;
	void *buf;
	size_t len;
	GsfOutput *out; 

	if( vips_black( &x, dz->tile_size, dz->tile_size, NULL ) ) 
		return( -1 );

	vips_area_get_data( (VipsArea *) dz->background, NULL, &n, NULL, NULL );
	ones = vips_area_new_array( G_TYPE_DOUBLE, sizeof( double ), n );
	d = (double *) vips_area_get_data( ones, NULL, NULL, NULL, NULL );
	for( i = 0; i < n; i++ )
		d[i] = 1.0; 
	if( vips_linear( x, &t, 
		d, 
		(double *) vips_area_get_data( (VipsArea *) dz->background, 
			NULL, NULL, NULL, NULL ),
		n, NULL ) ) {
		vips_area_unref( ones );
		g_object_unref( x );
		return( -1 );
	}
	vips_area_unref( ones );
	g_object_unref( x );
	x = t;

	if( vips_pngsave_buffer( x, &buf, &len, NULL ) ) {
		g_object_unref( x );
		return( -1 );
	}
	g_object_unref( x );

	out = vips_gsf_path( dz->tree, "blank.png", NULL ); 
	gsf_output_write( out, len, buf );
	gsf_output_close( out );
	g_object_unref( out );

	g_free( buf );

	return( 0 );
}

Example #2

File: im_vips2png.c Project: ChiaraCaiazza/collageMaker

int
im_vips2bufpng( IMAGE *in, IMAGE *out,
	int compression, int interlace, char **obuf, size_t *olen )
{
	if( vips_pngsave_buffer( in, (void **) obuf, olen, 
		"compression", compression, 
		"interlace", interlace, 
		NULL ) )
		return( -1 );

	if( out )
		im_add_callback( out, "close", 
			(im_callback_fn) vips_free, obuf, NULL ); 

	return( 0 );
}

Example #3

File: writer.c Project: ZeroPivot/ruby-vips

static VALUE
png_buf_internal(VALUE obj, VALUE compression, VALUE interlace)
{
    char *buf;
    size_t length;
    GetImg(obj, data, im);

#if ATLEAST_VIPS( 7, 28 )
    if (vips_pngsave_buffer(im, &buf, &length,
        "compression", NUM2INT(compression),
	"interlace", NUM2INT(interlace),
	NULL))
        vips_lib_error();
#elif ATLEAST_VIPS( 7, 23 )
    if (im_vips2bufpng(im, NULL, NUM2INT(compression), NUM2INT(interlace),
        &buf, &length)) 
        vips_lib_error();
#else
    rb_raise(eVIPSError, "This method is not implemented in your version of VIPS");
#endif

    return rb_tainted_str_new(buf, length);
}