| Presto | |
|---|---|
 | |
| Developer | Opera SoftwareASA |
| Stable release | |
| Written in | C++[2] |
| Operating system | Linux (non-free repositories) andWindows |
| Type | Application framework,Browser engine |
| License | Proprietary |
| Website | dev |
Presto was thebrowser engine of theOpera web browser from the release of Opera 7 on 28 January 2003, until the release of Opera 15 on 2 July 2013, at which time Opera switched to using theBlink engine that was originally created forChromium.[3] Presto was also used to power theOpera Mini andOpera Mobile browsers.
Presto is a dynamic engine.Web pages can be re-rendered completely or partially in response toDOM events. Its releases saw a number ofbug fixes and optimizations to improve the speed of theECMAScript (JavaScript) engine. It is proprietary and only available as a part of the Opera browsers.
A succession of ECMAScript engines have been used with Opera. (For the origin of their names, seeCultural notes below.) Pre-Presto versions of Opera used the Linear A engine. Opera versions based on the Corefork of Presto,Opera 7.0 through 9.27, used the Linear B engine.[4] The Futhark engine is used in some versions on the Core 2 fork of Presto, namely Opera 9.5 to Opera 10.10.[5] When released it was the fastest engine around, but in 2008 a new generation of ECMAScript engines fromGoogle (V8),Mozilla (SpiderMonkey), andApple (JavaScriptCore) took one more step, introducing native code generation. This opened up for potential heavy computations on the client side and Futhark, though still fast and efficient, was unable to keep up.[original research?]
In early 2009, Opera introduced the Carakan engine. It featured register-basedbytecode, native code generation, automatic object classification, and overall performance improvements.[6][7] Early access in the Opera 10.50 pre-alpha showed that it is as fast as the fastest competitors, being the winner in 2 out of the 3 most usedbenchmarks.[8]
| Presto Version | ECMAScript engine | Browser code name | Opera Browser | Opera Mobile | Other use | New features |
|---|---|---|---|---|---|---|
| pre Presto | unnamed | unnamed | 3.0 | The first version to support JavaScript[9] | ||
| pre Presto | Linear A | Elektra/unnamed[10][note 1] | 4.0 | |||
| 1.0 | Linear B | unnamed | 7.0 | a completely new rendering engine,Favicon support[11] | ||
| 8.5 | "Bolton" version: 1st completely free download version (ad-free toolbar) | |||||
| 2.0 | Merlin | 9.0 | Internet Channel[12] | Canvas,Acid2 Test: passed, Rich text editing, XSLT, and XPath | ||
| 2.1 | Futhark | Kestrel | 9.5 | 9.5[13] | Nintendo DSi Browser | SVG Tiny 1.2, SVG as CSS, SVG as <img>, Audio object |
| 2.1.1 | 9.6 | Scope API,[14] SVG asFavicon | ||||
| 2.2 | Peregrine | 9.7[15] | ||||
| 2.2.15 | 10.0 10.1 | 9.8[16] | Acid3 test: 100/100, pixel-perfect, Web fonts, CSS Selectors API,RGBA &HSLA opacity,TLS 1.2.,[17] FPS in SVG, SVG fonts in HTML | |||
| 2.3 | Opera Devices SDK 10 | CSS3 : border-image, border-radius (rounded corners), box-shadow, transitions; HTML5: <audio> and <video> elements | ||||
| 2.4 | 10 | CSS2.1: visibility:collapse; CSS3 : transforms; HTML5: <canvas> shadows, Web Database,Web Storage, window.btoa, and window.atob | ||||
| 2.5.24 | Carakan | Evenes | 10.5 | 10.1 | Opera Mini server | CSS3: multiple backgrounds; HTML5: <canvas> Text |
| 2.6.30 | 10.6 | WebM; HTML5:AppCache,Geolocation,Web Workers[18] | ||||
| 2.7.62 | Kjevik | 11.0 | 11.0 | Extensions,WebSocket | ||
| 2.8.131 | Barracuda | 11.1 | 11.1 | Opera Mini server 4.27 | WebP,File API, CSS3 gradients (only for thebackground andbackground-image properties): -o-linear-gradient(), -o-repeating-linear-gradient(); Support for<color-stop> added. | |
| 2.9.168 | Swordfish | 11.5 | Session history management, classList (DOMTokenList) | |||
| 2.9.201 | 11.50 for Android | ECMAscript strict mode | ||||
| 2.10.229 | Tunny | 11.6 | 11.6 | HTML5 Parser, full support toCSS Gradients, Typed Arrays, CSS unit "rem" | ||
| 2.10.254 | Wahoo | 12.0 | WebGL andhardware acceleration[19] | |||
| 2.10.289 | 12.0 | |||||
| 2.11.355 | Marlin | 12.1 for Android | SPDY, CSS3 Flexbox[20] | |||
| 2.12.388 | 12.10–12.18 |
The source code for version 12.15 was leaked toGitHub on February 11, 2016.[27] It remained unnoticed until January 12, 2017 and was taken down two days later in response to aDMCA request.[28][29]Opera Software has confirmed the authenticity of the source code.[30]
The ECMAScript engines used with Opera have been named after ancient and traditional writing scripts, including undecipheredLinear A, Ancient GreekLinear B, RunicFuthark, andJavanese Carakan.[6]
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