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 );
}
/**
* vips_value_get_area:
* @value: get from this value
* @length: (allow-none): optionally return length here
*
* Get the pointer from an area. Don't touch count (area is static).
*
* Returns: (transfer none): The pointer held by @value.
*/
void *
vips_value_get_area( const GValue *value, size_t *length )
{
VipsArea *area;
area = g_value_get_boxed( value );
return( vips_area_get_data( area, length, NULL, NULL, NULL ) );
}
/**
* vips_array_double_new:
* @array: (array length=n): array of double
* @n: number of doubles
*
* Allocate a new array of doubles and copy @array into it. Free with
* vips_area_unref().
*
* See also: #VipsArea.
*
* Returns: (transfer full): A new #VipsArrayDouble.
*/
VipsArrayDouble *
vips_array_double_new( const double *array, int n )
{
VipsArea *area;
double *array_copy;
printf( "hello, world!\n" );
area = vips_area_new_array( G_TYPE_DOUBLE, sizeof( double ), n );
array_copy = vips_area_get_data( area, NULL, NULL, NULL, NULL );
memcpy( array_copy, array, n * sizeof( double ) );
return( area );
}