renderer-canvas.js | Explore in Territory

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

(async function(testRunner) {
  let {page, session, dp} = await testRunner.startWithFrameControl(
      'Tests renderer: canvas.');

  await dp.Runtime.enable();
  await dp.HeadlessExperimental.enable();

  let RendererTestHelper =
      await testRunner.loadScript('../helpers/renderer-test-helper.js');
  let {httpInterceptor, frameNavigationHelper, virtualTimeController} =
      await (new RendererTestHelper(testRunner, dp, page)).init();

  httpInterceptor.addResponse(
      `http://example.com/`,
      `<html>
        <body>
          <canvas id="test_canvas" width="100" height="100"
                  style="position:absolute;left:0px;top:0px">
            Oops!  Canvas not supported!
          </canvas>
          <script>
            var context = document.getElementById("test_canvas").
                          getContext("2d");
            context.fillStyle = "rgb(255,0,0)";
            context.fillRect(25, 25, 50, 50);
          </script>
        </body>
      </html>`);


  await virtualTimeController.initialize(1000);
  await frameNavigationHelper.navigate('http://example.com/');
  await virtualTimeController.grantTime(500);
  const ctx = await virtualTimeController.captureScreenshot();
  const rgba = ctx.getImageData(0, 0, 1, 1).data;
  testRunner.log(`rgba @(0,0): ${rgba}`);
  // Expected rgba @(25,25): 255,0,0,255
  const rgba2 = ctx.getImageData(25, 25, 1, 1).data;
  testRunner.log(`rgba @(25,25): ${rgba2}`);
  testRunner.completeTest();
})
chromium/headless/test/data/protocol/sanity/renderer-canvas.js
