release memory between preview and export

js/kiri-driver-sla.js

@@ -292,11 +292,15 @@ let gs_kiri_sla = exports;
         }, (progress, message) => {
             online({progress: progress * 0.75 + 0.25, message});
         });
+
         ondone({
             width: 2560,
             height: 1440,
             file: file
         },[file]);
+
+        // release memory
+        print.images = null;
     };
 
     // runs in browser main

js/kiri-print.js

@@ -320,6 +320,7 @@ let gs_kiri_print = exports;
                 }
             });
         });
+
         return newout;
     };
 

js/kiri-work.js

@@ -20,7 +20,7 @@ function send(fn, data, onreply, async, zerocopy) {
     let seq = seqid++;
 
     running[seq] = {fn:onreply, async:async||false};
-
+    // console.log('send', data);
     worker.postMessage({
         seq: seq,
         task: fn,
@@ -56,7 +56,7 @@ KIRI.work = {
                 reply = e.data,
                 record = running[reply.seq],
                 onreply = record.fn;
-
+                // console.log('recv', reply.data)
             if (reply.done) {
                 delete running[reply.seq];
             }

js/kiri-worker.js

@@ -140,9 +140,9 @@ let dispatch = {
     },
 
     clear: function(data, send) {
+        currentPrint = null;
         if (!data.id) {
             cache = {};
-            currentPrint = null;
             send.done({ clear: true });
             return;
         }

js/kiri.js

@@ -1822,6 +1822,8 @@ self.kiri.copyright = exports.COPYRIGHT;
         updateSelectedInfo();
         switch (mode) {
             case VIEWS.ARRANGE:
+                KIRI.work.clear();
+                clearWidgetCache();
                 showLayerView(false);
                 updateSliderMax();
                 showModeActive(UI.modeArrange);