static int
read_image( Read *read, VipsImage *out )
{
VipsImage **t = (VipsImage **)
vips_object_local_array( VIPS_OBJECT( out ), 3 );
guint64 length;
void *data;
int fd;
webp_decoder decoder;
/* libwebp makes streaming very hard. We have to read to a full memory
* buffer, then copy to out.
*
* mmap the input file, it's slightly quicker.
*/
t[0] = vips_image_new_buffer();
if( read_header( read, t[0] ) )
return( -1 );
if( vips_image_write_prepare( t[0] ) )
return( -1 );
if( !(fd = vips__open_image_read( read->filename )) )
return( -1 );
if( (length = vips_file_length( fd )) < 0 ) {
vips_tracked_close( fd );
return( -1 );
}
if( !(data = vips__mmap( fd, FALSE, length, 0 )) ) {
vips_tracked_close( fd );
return( -1 );
}
if( t[0]->Bands == 3 )
decoder = WebPDecodeRGBInto;
else
decoder = WebPDecodeRGBAInto;
if( !decoder( (uint8_t *) data, length,
VIPS_IMAGE_ADDR( t[0], 0, 0 ),
VIPS_IMAGE_SIZEOF_IMAGE( t[0] ),
VIPS_IMAGE_SIZEOF_LINE( t[0] ) ) ) {
vips__munmap( data, length );
vips_tracked_close( fd );
vips_error( "webp2vips", "%s", _( "unable to read pixels" ) );
return( -1 );
}
vips__munmap( data, length );
vips_tracked_close( fd );
if( vips_image_write( t[0], out ) )
return( -1 );
return( 0 );
}
static int
read_free( Read *read )
{
VIPS_FREEF( WebPIDelete, read->idec );
WebPFreeDecBuffer( &read->config.output );
if( read->fd > 0 &&
read->data &&
read->length > 0 ) {
vips__munmap( read->data, read->length );
read->data = NULL;
read->length = 0;
}
VIPS_FREEF( vips_tracked_close, read->fd );
VIPS_FREE( read->filename );
VIPS_FREE( read );
return( 0 );
}
static int
vips_window_unmap( VipsWindow *window )
{
/* unmap the old window
*/
if( window->baseaddr ) {
if( vips__munmap( window->baseaddr, window->length ) )
return( -1 );
#ifdef DEBUG_TOTAL
g_mutex_lock( vips__global_lock );
total_mmap_usage -= window->length;
assert( total_mmap_usage >= 0 );
g_mutex_unlock( vips__global_lock );
#endif /*DEBUG_TOTAL*/
window->data = NULL;
window->baseaddr = NULL;
window->length = 0;
}
return( 0 );
}
