From 5f89406b7bebba9a172cd36f94ed384263ac1f6d Mon Sep 17 00:00:00 2001
From: Kiko Beats <josefrancisco.verdu@gmail.com>
Date: Tue, 19 Mar 2024 12:01:01 +0100
Subject: [PATCH] perf(screenshot): use sampling for `is-white` (#570)

* test(screenshot): add is-white assertion

* perf: use sampling

* test: update snapshot
---
 packages/goto/test/unit/evasions/index.js      |   2 +-
 packages/screenshot/src/is-white-screenshot.js |   8 ++++++--
 .../screenshot/test/fixtures/no-white-5k.jpg   | Bin 0 -> 405478 bytes
 .../screenshot/test/fixtures/no-white-5k.png   | Bin 0 -> 257738 bytes
 packages/screenshot/test/fixtures/white-5k.jpg | Bin 0 -> 405393 bytes
 packages/screenshot/test/fixtures/white-5k.png | Bin 0 -> 257734 bytes
 .../screenshot/test/is-white-screenshot.js     |  16 ++++++++++++++++
 7 files changed, 23 insertions(+), 3 deletions(-)
 create mode 100644 packages/screenshot/test/fixtures/no-white-5k.jpg
 create mode 100644 packages/screenshot/test/fixtures/no-white-5k.png
 create mode 100644 packages/screenshot/test/fixtures/white-5k.jpg
 create mode 100644 packages/screenshot/test/fixtures/white-5k.png
 create mode 100644 packages/screenshot/test/is-white-screenshot.js

diff --git a/packages/goto/test/unit/evasions/index.js b/packages/goto/test/unit/evasions/index.js
index 0cd63d7ca7..340a3d3cd8 100644
--- a/packages/goto/test/unit/evasions/index.js
+++ b/packages/goto/test/unit/evasions/index.js
@@ -152,7 +152,7 @@ test('media codecs are present', async t => {
       }
     })
 
-  t.deepEqual(await videoCodecs(), { ogg: 'probably', h264: 'probably', webm: 'probably' })
+  t.deepEqual(await videoCodecs(), { ogg: '', h264: 'probably', webm: 'probably' })
 
   t.deepEqual(await audioCodecs(), {
     ogg: 'probably',
diff --git a/packages/screenshot/src/is-white-screenshot.js b/packages/screenshot/src/is-white-screenshot.js
index d219ebef10..55506274f5 100644
--- a/packages/screenshot/src/is-white-screenshot.js
+++ b/packages/screenshot/src/is-white-screenshot.js
@@ -8,8 +8,12 @@ module.exports = async buffer => {
   const height = image.getHeight()
   const width = image.getWidth()
 
-  for (let i = 0; i < height; i++) {
-    for (let j = 0; j < width; j++) {
+  const samplePercentage = 0.25 // Sample 25% of the image
+  const sampleSize = Math.floor(width * height * samplePercentage) // Calculate sample size based on percentage
+  const stepSize = Math.max(1, Math.floor((width * height) / sampleSize)) // Calculate step size based on sample size
+
+  for (let i = 0; i < height; i += stepSize) {
+    for (let j = 0; j < width; j += stepSize) {
       if (firstPixel !== image.getPixelColor(j, i)) return false
     }
   }
diff --git a/packages/screenshot/test/fixtures/no-white-5k.jpg b/packages/screenshot/test/fixtures/no-white-5k.jpg
new file mode 100644
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diff --git a/packages/screenshot/test/is-white-screenshot.js b/packages/screenshot/test/is-white-screenshot.js
new file mode 100644
index 0000000000..f9aac9764a
--- /dev/null
+++ b/packages/screenshot/test/is-white-screenshot.js
@@ -0,0 +1,16 @@
+'use strict'
+
+const test = require('ava')
+const { readFile } = require('fs/promises')
+
+const isWhite = require('../src/is-white-screenshot')
+
+test('true', async t => {
+  t.true(await isWhite(await readFile('./test/fixtures/white-5k.jpg')))
+  t.true(await isWhite(await readFile('./test/fixtures/white-5k.png')))
+})
+
+test('false', async t => {
+  t.false(await isWhite(await readFile('./test/fixtures/no-white-5k.jpg')))
+  t.false(await isWhite(await readFile('./test/fixtures/no-white-5k.png')))
+})