account for mask pixeldensity

Author: Papershine

src/image/p5.Image.js

@@ -883,6 +883,11 @@ p5.Image = class {
     if (p5Image instanceof p5.Renderer) {
       maskScaleFactor = p5Image._pInst._pixelDensity;
     }
+    if (p5Image instanceof p5.Image) {
+      maskScaleFactor = p5Image._pixelDensity;
+    }
+    console.log('mask density ' + maskScaleFactor + ' image density ' + imgScaleFactor);
+    maskScaleFactor /= imgScaleFactor;
 
     const copyArgs = [
       p5Image,