fix: loadImage should handle file URL

__test__/loadimage.spec.ts

@@ -1,6 +1,7 @@
 import { join } from 'node:path'
 import fs from 'node:fs'
 import { readFile } from 'node:fs/promises'
+import { URL, pathToFileURL } from 'node:url'
 
 import test from 'ava'
 
@@ -30,6 +31,14 @@ test('should load remote url', async (t) => {
     'https://raw.githubusercontent.com/Brooooooklyn/canvas/462fce53afeaee6d6b4ae5d1b407c17e2359ff7e/example/anime-girl.png',
   )
   t.is(img instanceof Image, true)
+  t.is(
+    (await loadImage(
+      new URL(
+        'https://raw.githubusercontent.com/Brooooooklyn/canvas/462fce53afeaee6d6b4ae5d1b407c17e2359ff7e/example/anime-girl.png',
+      ),
+    )) instanceof Image,
+    true,
+  )
 })
 
 test('should load arrayBuffer', async (t) => {
@@ -68,3 +77,10 @@ test('should load issue-672 img', async (t) => {
   t.is(img.width, 297)
   t.is(img.height, 465)
 })
+
+test('should load file url', async (t) => {
+  const url = new URL('__test__/javascript.png', pathToFileURL(__dirname))
+  const img = await loadImage(url)
+  t.is(img.width, 512)
+  t.is(img.height, 512)
+})

load-image.js

@@ -1,5 +1,6 @@
 const fs = require('fs')
 const { Readable } = require('stream')
+const { URL } = require('url')
 
 const { Image } = require('./js-binding')
 
@@ -33,13 +34,13 @@ module.exports = async function loadImage(source, options = {}) {
     return createImage(data, options.alt)
   }
   // if source is a string or URL instance
-  if (typeof source === 'string' || source instanceof URL) {
+  if (typeof source === 'string') {
     // if the source exists as a file, construct image from that file
-    if (await exists(source)) {
+    if ((!source.startsWith('http') && !source.startsWith('https')) && await exists(source)) {
       return createImage(source, options.alt)
     } else {
       // the source is a remote url here
-      source = !(source instanceof URL) ? new URL(source) : source
+      source = new URL(source)
       // attempt to download the remote source and construct image
       const data = await new Promise((resolve, reject) =>
         makeRequest(
@@ -54,6 +55,24 @@ module.exports = async function loadImage(source, options = {}) {
     }
   }
 
+  if (source instanceof URL) {
+    if (source.protocol === 'file:') {
+      // remove the leading slash on windows
+      return createImage(process.platform === 'win32' ? source.pathname.substring(1) : source.pathname, options.alt)
+    } else {
+      const data = await new Promise((resolve, reject) =>
+        makeRequest(
+          source,
+          resolve,
+          reject,
+          typeof options.maxRedirects === 'number' && options.maxRedirects >= 0 ? options.maxRedirects : MAX_REDIRECTS,
+          options.requestOptions,
+        ),
+      )
+      return createImage(data, options.alt)
+    }
+  }
+
   // throw error as don't support that source
   throw new TypeError('unsupported image source')
 }