Remove resize handling in visual regression specs (#438)

test/screenshot.test.js

@@ -18,37 +18,6 @@ const SNAPSHOT_DIRECTORY = 'tmp/screenshot/branches';
 const MAIN_SNAPSHOTS_DIRECTORY = join(SNAPSHOT_DIRECTORY, 'main');
 const BRANCH_SNAPSHOTS_DIRECTORY = join(SNAPSHOT_DIRECTORY, branch);
 
-/**
- * Resizes an image to the given dimensions.
- *
- * @param {import('pngjs').PNGWithMetadata} image
- * @param {number} width
- * @param {number} height
- *
- * @return {import('pngjs').PNG}
- */
-function fillImageToSize(image, width, height) {
-  if (image.width === width && image.height === height) {
-    return image;
-  }
-
-  const resizedImage = new PNG({ width, height, fill: true });
-  PNG.bitblt(image, resizedImage, 0, 0, image.width, image.height, 0, 0);
-
-  for (let y = image.height; y < height; y += 1) {
-    for (let x = image.width; x < width; x += 1) {
-      // eslint-disable-next-line no-bitwise
-      const index = (resizedImage.width * y + x) << 2;
-      resizedImage.data[index] = 255; // Red
-      resizedImage.data[index + 1] = 255; // Green
-      resizedImage.data[index + 2] = 255; // Blue
-      resizedImage.data[index + 3] = 255; // Alpha (Opacity)
-    }
-  }
-
-  return resizedImage;
-}
-
 const skip = !!process.env.SKIP_VISUAL_REGRESSION_TEST;
 
 describe('screenshot visual regression', { skip, concurrency: true }, async () => {
@@ -68,18 +37,16 @@ describe('screenshot visual regression', { skip, concurrency: true }, async () =
       const mainPNG = PNG.sync.read(await readFile(join(MAIN_SNAPSHOTS_DIRECTORY, path)));
       const width = Math.max(branchPNG.width, mainPNG.width);
       const height = Math.max(branchPNG.height, mainPNG.height);
-      const resizedBranchPNG = fillImageToSize(branchPNG, width, height);
-      const resizedMainPNG = fillImageToSize(mainPNG, width, height);
       const diff = new PNG({ width, height });
-      const diffs = match(resizedBranchPNG.data, resizedMainPNG.data, diff.data, width, height, {
+      const diffs = match(branchPNG.data, mainPNG.data, diff.data, width, height, {
         threshold: 0.2,
       });
       if (diffs > 0) {
         const diffOutputBase = join(DIFF_DIRECTORY, path);
         await mkdir(DIFF_DIRECTORY, { recursive: true });
         await Promise.all([
-          writeFile(`${diffOutputBase}-local.png`, PNG.sync.write(resizedBranchPNG)),
-          writeFile(`${diffOutputBase}-remote.png`, PNG.sync.write(resizedMainPNG)),
+          writeFile(`${diffOutputBase}-local.png`, PNG.sync.write(branchPNG)),
+          writeFile(`${diffOutputBase}-remote.png`, PNG.sync.write(mainPNG)),
           writeFile(`${diffOutputBase}-diff.png`, PNG.sync.write(diff)),
         ]);
       }