108 lines
2.9 KiB
JavaScript
108 lines
2.9 KiB
JavaScript
/* Any copyright is dedicated to the public domain.
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http://creativecommons.org/publicdomain/zero/1.0/ */
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// Test the getScreenshot property for mozbrowser
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"use strict";
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SimpleTest.waitForExplicitFinish();
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browserElementTestHelpers.setEnabledPref(true);
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function runTest() {
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var dppxPref = 'layout.css.devPixelsPerPx';
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var cssPixelWidth = 600;
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var cssPixelHeight = 400;
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var iframe1 = document.createElement('iframe');
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iframe1.setAttribute('width', cssPixelWidth);
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iframe1.setAttribute('height', cssPixelHeight);
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iframe1.setAttribute('mozbrowser', 'true');
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iframe1.src = 'data:text/html,<html><body>hello</body></html>';
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document.body.appendChild(iframe1);
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var images = [];
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function screenshotTaken(image) {
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images.push(image);
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if (images.length === 1) {
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ok(true, 'Got initial non blank screenshot');
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if (image.width !== cssPixelWidth || image.height !== cssPixelHeight) {
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ok(false, 'The pixel width of the image received is not correct');
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SimpleTest.finish();
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return;
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}
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ok(true, 'The pixel width of the image received is correct');
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SpecialPowers.pushPrefEnv(
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{'set': [['layout.css.devPixelsPerPx', 2]]}, takeScreenshot);
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}
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else if (images.length === 2) {
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ok(true, 'Got updated screenshot after source page changed');
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if (image.width !== cssPixelWidth * 2 ||
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image.height !== cssPixelHeight * 2) {
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ok(false, 'The pixel width of the 2dppx image received is not correct');
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SimpleTest.finish();
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return;
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}
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ok(true, 'The pixel width of the 2dppx image received is correct');
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SimpleTest.finish();
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}
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}
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function takeScreenshot() {
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function gotImage(e) {
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// |this| is the Image.
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URL.revokeObjectURL(this.src);
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if (e.type === 'error' || !this.width || !this.height) {
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tryAgain();
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return;
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}
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screenshotTaken(this);
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}
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function tryAgain() {
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if (--attempts === 0) {
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ok(false, 'Timed out waiting for correct screenshot');
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SimpleTest.finish();
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} else {
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setTimeout(function() {
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iframe1.getScreenshot(cssPixelWidth, cssPixelHeight).onsuccess =
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getScreenshotImageData;
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}, 200);
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}
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}
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function getScreenshotImageData(e) {
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var blob = e.target.result;
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if (blob.size === 0) {
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tryAgain();
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return;
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}
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var img = new Image();
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img.src = URL.createObjectURL(blob);
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img.onload = img.onerror = gotImage;
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}
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var attempts = 10;
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iframe1.getScreenshot(cssPixelWidth, cssPixelHeight).onsuccess =
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getScreenshotImageData;
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}
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function iframeLoadedHandler() {
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SpecialPowers.pushPrefEnv(
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{'set': [['layout.css.devPixelsPerPx', 1]]}, takeScreenshot);
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}
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iframe1.addEventListener('mozbrowserloadend', iframeLoadedHandler);
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}
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addEventListener('testready', runTest);
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