Refactor Page.screenshot() api
This patch refactors Page.screenshot api, accoring to the discussion in #5: - Page.screenshot accepts single optional options object - Page.saveScreenshot is removed - Page.screenshot assumes 'png' screenshot if no type is set and no 'path' property is given Fixes #5.
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Andrey Lushnikov
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7d04d112da
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3b0bc0802d
@ -22,7 +22,6 @@
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- [page.evaluate(fun, args)](#pageevaluatefun-args)
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- [page.evaluateOnInitialized(fun, args)](#pageevaluateoninitializedfun-args)
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- [page.screenshot(type[, clipRect])](#pagescreenshottype-cliprect)
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- [page.saveScreenshot(filePath[, clipRect])](#pagesavescreenshotfilepath-cliprect)
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- [page.printToPDF(filePath[, options])](#pageprinttopdffilepath-options)
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- [page.plainText()](#pageplaintext)
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- [page.title()](#pagetitle)
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@ -157,11 +156,6 @@ Pages could be closed by `page.close()` method.
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- `height` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) height of clipping area
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- returns: [<Promise<Buffer>>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves to buffer with captured screenshot
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#### page.saveScreenshot(filePath[, clipRect])
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- `filePath` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) The file path to save image to. The screenshot type will be inferred from file extension
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- `clipRect` [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) Clip rect object which will be passed over to `page.screenshot` method.
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#### page.printToPDF(filePath[, options])
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- `filePath` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) The file path to save image to. The screenshot type will be inferred from file extension
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80
lib/Page.js
80
lib/Page.js
@ -387,20 +387,52 @@ class Page extends EventEmitter {
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}
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/**
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* @param {!Page.ScreenshotType} screenshotType
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* @param {?{x: number, y: number, width: number, height: number}} clipRect
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* @param {!Object=} options
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* @return {!Promise<!Buffer>}
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*/
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async screenshot(screenshotType, clipRect) {
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if (clipRect) {
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async screenshot(options) {
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var screenshotType = null;
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if (options.path) {
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var mimeType = mime.lookup(options.path);
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if (mimeType === 'image/png')
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screenshotType = 'png';
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else if (mimeType === 'image/jpeg')
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screenshotType = 'jpeg';
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else
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throw new Error('Unsupported screenshot mime type: ' + mimeType);
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}
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if (options.type) {
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if (screenshotType && options.type !== screenshotType)
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throw new Error(`Passed screenshot type '${options.type}' does not match to the type inferred from the file path: '${screenshotType}'`);
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if (options.type !== 'png' && options.type !== 'jpeg')
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throw new Error('Unknown screenshot type: ' + options.type);
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screenshotType = options.type;
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}
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if (!screenshotType)
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screenshotType = 'png';
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if (options.quality) {
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console.assert(screenshotType === 'jpeg', 'options.quality is unsupported for the ' + screenshotType + ' screenshots');
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console.assert(typeof options.quality === 'number', 'Expected options.quality to be a number but found ' + (typeof options.quality));
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console.assert(Number.isInteger(options.quality), 'Expected options.quality to be an integer');
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console.assert(options.quality >= 0 && options.quality <= 100, 'Expected options.quality to be between 0 and 100 (inclusive), got ' + options.quality);
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}
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if (options.clip) {
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console.assert(typeof options.clip.x === 'number', 'Expected options.clip.x to be a number but found ' + (typeof options.clip.x));
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console.assert(typeof options.clip.y === 'number', 'Expected options.clip.y to be a number but found ' + (typeof options.clip.y));
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console.assert(typeof options.clip.width === 'number', 'Expected options.clip.width to be a number but found ' + (typeof options.clip.width));
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console.assert(typeof options.clip.height === 'number', 'Expected options.clip.height to be a number but found ' + (typeof options.clip.height));
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}
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if (options.clip) {
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await Promise.all([
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this._client.send('Emulation.setVisibleSize', {
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width: Math.ceil(clipRect.width / this._screenDPI),
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height: Math.ceil(clipRect.height / this._screenDPI),
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width: Math.ceil(options.clip.width / this._screenDPI),
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height: Math.ceil(options.clip.height / this._screenDPI),
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}),
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this._client.send('Emulation.forceViewport', {
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x: clipRect.x / this._screenDPI,
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y: clipRect.y / this._screenDPI,
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x: options.clip.x / this._screenDPI,
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y: options.clip.y / this._screenDPI,
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scale: 1,
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})
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]);
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@ -408,32 +440,18 @@ class Page extends EventEmitter {
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var result = await this._client.send('Page.captureScreenshot', {
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fromSurface: true,
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format: screenshotType,
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quality: options.quality
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});
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if (clipRect) {
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if (options.clip) {
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await Promise.all([
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this.setViewportSize(this.viewportSize()),
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this._client.send('Emulation.resetViewport')
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]);
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}
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return new Buffer(result.data, 'base64');
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}
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/**
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* @param {string} filePath
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* @param {?{x: number, y: number, width: number, height: number}} clipRect
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* @return {!Promise}
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*/
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async saveScreenshot(filePath, clipRect) {
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var mimeType = mime.lookup(filePath);
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var screenshotType = null;
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if (mimeType === 'image/png')
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screenshotType = Page.ScreenshotTypes.PNG;
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else if (mimeType === 'image/jpeg')
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screenshotType = Page.ScreenshotTypes.JPG;
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if (!screenshotType)
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throw new Error(`Cannot render to file ${filePath} - unsupported mimeType ${mimeType}`);
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var buffer = await this.screenshot(screenshotType, clipRect);
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fs.writeFileSync(filePath, buffer);
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var buffer = new Buffer(result.data, 'base64');
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if (options.path)
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fs.writeFileSync(options.path, buffer);
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return buffer;
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}
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/**
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@ -522,12 +540,6 @@ class InPageCallback {
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}
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}
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/** @enum {string} */
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Page.ScreenshotTypes = {
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PNG: 'png',
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JPG: 'jpeg',
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};
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/** @enum {string} */
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Page.PaperFormats = {
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Letter: {width: 8.5, height: 11},
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@ -285,15 +285,6 @@ class WebPage {
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* {string} fileName
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*/
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render(fileName) {
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var clipRect = null;
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if (this.clipRect && (this.clipRect.left || this.clipRect.top || this.clipRect.width || this.clipRect.height)) {
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clipRect = {
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x: this.clipRect.left,
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y: this.clipRect.top,
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width: this.clipRect.width,
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height: this.clipRect.height
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};
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}
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if (fileName.endsWith('pdf')) {
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var options = {};
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var paperSize = this.paperSize || {};
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@ -304,6 +295,16 @@ class WebPage {
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options.height = paperSize.height;
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await(this._page.printToPDF(fileName, options));
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} else {
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var options = {};
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if (this.clipRect && (this.clipRect.left || this.clipRect.top || this.clipRect.width || this.clipRect.height)) {
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options.clipRect = {
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x: this.clipRect.left,
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y: this.clipRect.top,
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width: this.clipRect.width,
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height: this.clipRect.height
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};
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}
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options.path = fileName;
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await(this._page.saveScreenshot(fileName, clipRect));
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}
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}
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@ -55,17 +55,19 @@ describe('GoldenTests', function() {
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imageTest('screenshot-sanity.png', async function() {
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await page.setViewportSize({width: 500, height: 500});
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await page.navigate(STATIC_PREFIX + '/grid.html');
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return page.screenshot('png');
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return await page.screenshot();
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});
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imageTest('screenshot-clip-rect.png', async function() {
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await page.setViewportSize({width: 500, height: 500});
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await page.navigate(STATIC_PREFIX + '/grid.html');
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return page.screenshot('png', {
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return await page.screenshot({
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clip: {
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x: 50,
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y: 100,
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width: 150,
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height: 100
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}
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});
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});
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});
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