1 files changed, 88 insertions, 0 deletions
diff --git a/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/VerticalClippingTest.kt b/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/VerticalClippingTest.kt
new file mode 100644
index 0000000000..2e340c09c2
--- /dev/null
+++ b/mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/VerticalClippingTest.kt
@@ -0,0 +1,88 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
+ * Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+package org.mozilla.geckoview.test
+
+import android.graphics.* // ktlint-disable no-wildcard-imports
+import android.graphics.Bitmap
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.MediumTest
+import org.hamcrest.Matchers
+import org.hamcrest.Matchers.equalTo
+import org.hamcrest.Matchers.notNullValue
+import org.junit.Assume.assumeThat
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mozilla.geckoview.GeckoResult
+import org.mozilla.geckoview.GeckoSession
+import org.mozilla.geckoview.GeckoSession.ContentDelegate
+import org.mozilla.geckoview.test.rule.GeckoSessionTestRule.AssertCalled
+import org.mozilla.geckoview.test.rule.GeckoSessionTestRule.WithDisplay
+
+private const val SCREEN_HEIGHT = 800
+private const val SCREEN_WIDTH = 800
+private const val BANNER_HEIGHT = SCREEN_HEIGHT * 0.1f // height: 10%
+
+@RunWith(AndroidJUnit4::class)
+@MediumTest
+class VerticalClippingTest : BaseSessionTest() {
+    private fun getComparisonScreenshot(bottomOffset: Int): Bitmap {
+        val screenshotFile = Bitmap.createBitmap(SCREEN_WIDTH, SCREEN_HEIGHT, Bitmap.Config.ARGB_8888)
+        val canvas = Canvas(screenshotFile)
+        val paint = Paint()
+
+        // Draw body
+        paint.color = Color.rgb(0, 0, 255)
+        canvas.drawRect(0f, 0f, SCREEN_WIDTH.toFloat(), SCREEN_HEIGHT.toFloat(), paint)
+
+        // Draw bottom banner
+        paint.color = Color.rgb(0, 255, 0)
+        canvas.drawRect(
+            0f,
+            SCREEN_HEIGHT - BANNER_HEIGHT - bottomOffset,
+            SCREEN_WIDTH.toFloat(),
+            (SCREEN_HEIGHT - bottomOffset).toFloat(),
+            paint,
+        )
+
+        return screenshotFile
+    }
+
+    private fun assertScreenshotResult(result: GeckoResult<Bitmap>, comparisonImage: Bitmap) {
+        sessionRule.waitForResult(result).let {
+            assertThat(
+                "Screenshot is not null",
+                it,
+                notNullValue(),
+            )
+            assertThat("Widths are the same", comparisonImage.width, equalTo(it.width))
+            assertThat("Heights are the same", comparisonImage.height, equalTo(it.height))
+            assertThat("Byte counts are the same", comparisonImage.byteCount, equalTo(it.byteCount))
+            assertThat("Configs are the same", comparisonImage.config, equalTo(it.config))
+            assertThat(
+                "Images are almost identical",
+                ScreenshotTest.Companion.imageElementDifference(comparisonImage, it),
+                Matchers.lessThanOrEqualTo(1),
+            )
+        }
+    }
+
+    @WithDisplay(height = SCREEN_HEIGHT, width = SCREEN_WIDTH)
+    @Test
+    fun verticalClippingSucceeds() {
+        // Disable failing test on Webrender. Bug 1670267
+        assumeThat(sessionRule.env.isWebrender, equalTo(false))
+        sessionRule.display?.setVerticalClipping(45)
+        mainSession.loadTestPath(FIXED_BOTTOM)
+        sessionRule.waitUntilCalled(object : ContentDelegate {
+            @AssertCalled(count = 1)
+            override fun onFirstContentfulPaint(session: GeckoSession) {
+            }
+        })
+
+        sessionRule.display?.let {
+            assertScreenshotResult(it.capturePixels(), getComparisonScreenshot(45))
+        }
+    }
+}