Création des Logiciels de gestion d'Entreprise, Création et référencement des sites web, Réseaux et Maintenance, Conception
Création des Logiciels de gestion d'Entreprise, Création et référencement des sites web, Réseaux et Maintenance, Conception
(Cross-posted from the Chromium Blog)
We’re happy to announce that WebGL is now on by default in Google Chrome’s beta channel, with some shiny new demos to show off what the technology can do.
WebGL is a 3D graphics API for JavaScript that developers can use to create fully 3D web apps. It is based on the OpenGL ES 2.0 API, which should be familiar to many 3D graphics developers. Google, Mozilla, Apple, Opera and graphics hardware vendors have been working together to standardize WebGL for over a year now, and since the spec is just about final at this point, we wanted to get our implementation out there for feedback.
While you may not find much WebGL content on the web, we expect developers to quickly create a lot of content given the power and familiarity of the API. To inspire developers and give users a taste of the kind of apps they can expect in the near future, we’ve worked with a few talented teams to build a few more 3D web apps:
Body Browser, a human anatomy explorer built by a team at Google as a 20% project
Nine Point Five, a 3D earthquake map by Dean McNamee
Music Visualizer, a jukebox that synchronizes 3D graphics to the beat of the music by Jacob Seidelin
You can find these and other demos in the new Chrome Experiments Gallery for WebGL demos. Now that WebGL is enabled in the beta channel, the Chrome Experiments team is looking for your cool WebGL app submissions to show off this slick technology, so don’t forget to submit your cool 3D apps!
By Kenneth Russell, Chromium Team2013, By: Seo MasterTwenty years ago this month, Tim Berners-Lee published his proposal for the World Wide Web. Since then, web browsers and web programming languages have come a long way. A few of us on the Chrome team decided to write an online guide for everyday users who are curious about the basics of how browsers and the web work, and how their evolution has changed the way we work and play online. Called "20 Things I Learned about Browsers and the Web," this online guidebook is illustrated by Christoph Niemann, and built in HTML5, JavaScript and CSS3, with our friends at Fi.
In building an online book app, HTML5, JavaScript and CSS3 gave us the ability to bring to life features that hearken back to what we love about books with the best aspects of the open web: the app works everywhere, and on any device with a modern browser. Here are a few features of the book experience that we’re particularly excited about:
This illustrated guidebook is best experienced in Chrome or any up-to-date, HTML5-compliant modern browser. We hope you enjoy the read as much as we did creating it, at www.20thingsilearned.com or goo.gl/20things.
chrome.tts.speak('Hello, world!');It’s also very easy to change the rate, pitch, and volume. Here’s an example that speaks more slowly:
chrome.tts.speak('Can you understand me now?', {rate: 0.6});How about powerful? To get even fancier and synchronize speech with your application, you can register to receive callbacks when the speech starts and finishes. When a TTS engine supports it, you can get callbacks for individual words too. You can also get a list of possible voices and ask for a particular voice – more on this below. All the details can be found in the TTS API docs, and we provide complete example code on the samples page.
chrome.tts.speak
. Your extension then takes care of synthesizing and outputting the speech – using any web technology you like, including HTML5 Audio, the new Web Audio API, or Native Client.printf
.Cross-posted from the Chromium Blog
As part of Google’s initiative to make the web faster, over the past few months we have released a number of tools to help site owners speed up their websites. We launched the Page Speed Firefox extension to evaluate the performance of web pages and to get suggestions on how to improve them, we introduced the Speed Tracer Chrome extension to help identify and fix performance problems in web applications, and we released a set of closure tools to help build rich web applications with fully optimized JavaScript code. While these tools have been incredibly successful in helping developers optimize their sites, as we’ve evaluated our progress, we continue to notice a single component of web pages is consistently responsible for the majority of the latency on pages across the web: images.
Most of the common image formats on the web today were established over a decade ago and are based on technology from around that time. Some engineers at Google decided to figure out if there was a way to further compress lossy images like JPEG to make them load faster, while still preserving quality and resolution. As part of this effort, we are releasing a developer preview of a new image format, WebP, that promises to significantly reduce the byte size of photos on the web, allowing web sites to load faster than before.
Images and photos make up about 65% of the bytes transmitted per web page today. They can significantly slow down a user’s web experience, especially on bandwidth-constrained networks such as a mobile network. Images on the web consist primarily of lossy formats such as JPEG, and to a lesser extent lossless formats such as PNG and GIF. Our team focused on improving compression of the lossy images, which constitute the larger percentage of images on the web today.
To improve on the compression that JPEG provides, we used an image compressor based on the VP8 codec that Google open-sourced in May 2010. We applied the techniques from VP8 video intra frame coding to push the envelope in still image coding. We also adapted a very lightweight container based on RIFF. While this container format contributes a minimal overhead of only 20 bytes per image, it is extensible to allow authors to save meta-data they would like to store.
While the benefits of a VP8 based image format were clear in theory, we needed to test them in the real world. In order to gauge the effectiveness of our efforts, we randomly picked about 1,000,000 images from the web (mostly JPEGs and some PNGs and GIFs) and re-encoded them to WebP without perceptibly compromising visual quality. This resulted in an average 39% reduction in file size. We expect that developers will achieve in practice even better file size reduction with WebP when starting from an uncompressed image.
To help you assess WebP’s performance with other formats, we have shared a selection of open-source and classic images along with file sizes so you can visually compare them on this site. We are also releasing a conversion tool that you can use to convert images to the WebP format. We’re looking forward to working with the browser and web developer community on the WebP spec and on adding native support for WebP. While WebP images can’t be viewed until browsers support the format, we are developing a patch for WebKit to provide native support for WebP in an upcoming release of Google Chrome. We plan to add support for a transparency layer, also known as alpha channel in a future update.
We’re excited to hear feedback from the developer community on our discussion group, so download the conversion tool, try it out on your favorite set of images, and let us know what you think.
By Richard Rabbat, WebP Team2013, By: Seo Master<audio>
to play music and sounds. <video>
element on the page. A facial detection JavaScript library then looks for movement and applies a CSS 3D transform to the elements on the page, making environment move with the user. This week, a lot.
Today we’re excited to announce the band Arcade Fire’s new project “The Wilderness Downtown,” an interactive HTML5 music experience that is being showcased on Google’s Chrome Experiments site. The project was created by writer/director Chris Milk with Arcade Fire and Google.
We put everything except the proverbial kitchen sink into this project: It features HTML5 audio, video, and canvas, animated windows with JavaScript controllers, mash-ups with Google Maps and Street View APIs, and an interactive drawing tool. You can take a look at how all this works by viewing the source code.
Check out the project or learn more about the techniques used to make it happen at www.chromeexperiments.com/arcadefire.
We hope you enjoy it.
Deroy |
Sergio |