Handle malformed image parser errors in View Bit Plane (#2612)

src/core/operations/ViewBitPlane.mjs

@@ -52,9 +52,15 @@ class ViewBitPlane extends Operation {
         if (!isImage(input))
             throw new OperationError("Please enter a valid image file.");
 
-        const [colour, bit] = args,
+        const [colour, bit] = args;
-            parsedImage = await Jimp.read(input),
+        let parsedImage;
-            width = parsedImage.bitmap.width,
+        try {
+            parsedImage = await Jimp.read(input);
+        } catch (err) {
+            throw new OperationError(`Error loading image. (${err})`);
+        }
+
+        const width = parsedImage.bitmap.width,
             height = parsedImage.bitmap.height,
             colourIndex = COLOUR_OPTIONS.indexOf(colour),
             bitIndex = 7 - bit;

tests/operations/tests/Image.mjs

@@ -241,6 +241,21 @@ TestRegister.addTests([
             }
         ]
     },
+    {
+        name: "View Bit Plane: malformed PNG",
+        input: PNG_HEX.replace("49484452", "49424452"),
+        expectedOutput: "Error loading image. (Error: unrecognised content at end of stream)",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: ["None"]
+            },
+            {
+                op: "View Bit Plane",
+                args: ["Red", 0]
+            }
+        ]
+    },
     {
         name: "Randomize Colour Palette",
         "input": PNG_HEX,