Create Java infrastructure for UI Render Tests.

chrome/test/android/javatests/src/org/chromium/chrome/test/util/RenderUtils.java

Index: chrome/test/android/javatests/src/org/chromium/chrome/test/util/RenderUtils.java
diff --git a/chrome/test/android/javatests/src/org/chromium/chrome/test/util/RenderUtils.java b/chrome/test/android/javatests/src/org/chromium/chrome/test/util/RenderUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..13d6641fb3f3a303904c1d3e8af7c95412bebe30
--- /dev/null
+++ b/chrome/test/android/javatests/src/org/chromium/chrome/test/util/RenderUtils.java
@@ -0,0 +1,71 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.test.util;
+
+import android.app.Activity;
+import android.graphics.Bitmap;
+import android.graphics.Point;
+import android.os.Build;
+import android.os.Environment;
+import android.view.View;
+
+import org.chromium.ui.UiUtils;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+/**
+ * A collection of methods to aid in creating Render Tests - tests that render UI components.
+ */
+public class RenderUtils {

[jbudorick, 2016/07/01 15:34:22]

@RenderTest and any supporting java code should be in the same package.

[PEConn, 2016/07/01 16:46:13]

So the main reason I put RenderUtils in here instead of in base/ was because it
relied on UiUtils (in ui/). Should I move @RenderTest over to here then?

[jbudorick, 2016/07/01 16:49:22]

I'm not sure. I could certainly see the case for having @RenderTest in base/,
but if it lives there, I imagine that some of the supporting code (i.e.,
whatever doesn't depend on ui/) should also live there.

+
+    /**
+     * A class to contain all the TestClass level information associated with rendering views.
+     */
+    public static class ViewRenderer {
+        private final Activity mActivity;
+        private final String mTestClass;
+
+        public ViewRenderer(Activity activity, String testClass) {
+            mActivity = activity;
+            mTestClass = testClass;
+        }
+
+        public void save(View view, String desc) throws IOException {
+            renderViewToFile(mActivity, mTestClass, view, desc);
+        }
+    }
+
+    private static String imageName(Activity activity, String testClass, String desc) {
+        Point outSize = new Point();
+        activity.getWindowManager().getDefaultDisplay().getSize(outSize);
+        String orientation = outSize.x > outSize.y ? "land" : "port";
+        return String.format("%s.%s.%s.%s.png",
+                testClass, desc, Build.MODEL.replace(' ', '_'), orientation);
+    }
+
+    private static void renderViewToFile(Activity activity, String testClass, View view,
+            String desc) throws IOException {
+        renderViewToFile(view, imageName(activity, testClass, desc));
+    }
+
+    private static void renderViewToFile(View view, String filename) throws IOException {
+        Bitmap bm = UiUtils.generateScaledScreenshot(view, 0, Bitmap.Config.ARGB_8888);
+        saveBmp(bm, filename);
+    }
+
+    private static void saveBmp(Bitmap bmp, String filename) throws IOException {
+        File folder = new File(Environment.getExternalStorageDirectory() + "/render_tests");
+        if (!folder.exists()) {
+            folder.mkdir();
+        }
+
+        File file = new File(folder + "/" + filename);
+        FileOutputStream out = new FileOutputStream(file);
+        bmp.compress(Bitmap.CompressFormat.PNG, 100, out);
+        out.close();
+    }
+}