- STOP FLASH VIDEOS FROM MOVING AROUND CHROME FOR MAC SOFTWARE
- STOP FLASH VIDEOS FROM MOVING AROUND CHROME FOR MAC SERIES
- STOP FLASH VIDEOS FROM MOVING AROUND CHROME FOR MAC MAC
Figure 2: An element in its own layer ( open stand-alone)
The blue grid represents tiles, which you can think of as sub-units of a layer that Chrome uses to upload parts of a large layer at a time to the GPU.
Screenshot of composited layer render borders around the page's base layer These screenshots and examples are all taken from the latest Chrome Canary, Chrome 27 at the time of this writing. It very simply highlights where layers are on-screen. little cog icon) in Dev Tools, under the “rendering” heading. Let’s look at a couple examples to illustrate the layer concept.Ī very useful tool when studying layers in Chrome is the “show composited layer borders” flag in the settings (i.e. This is how 3D CSS works, and it’s also great for fast scrolling - but more on both of these later. Textures can be cheaply mapped to different positions and transformations by applying them to a really simple rectangular mesh. Once it’s on the GPU, you can map it to a mesh geometry - in video games or CAD programs, this technique is used to give skeletal 3D models “skin.” Chrome uses textures to get chunks of web page content onto the GPU. Quick aside on GPU terminology: what’s a texture? Think of it as a bitmap image that’s moved from main memory (i.e. I’ll just say “layer” from here on out to mean GraphicsLayer. The latter is most interesting to us here, because GraphicsLayers are what get uploaded to the GPU as textures. In Chrome there are actually several different types of layers: RenderLayers, which are responsible for subtrees of the DOM, and GraphicsLayers, which are responsible for subtrees of RenderLayers. The most important of these structures is a layer.
STOP FLASH VIDEOS FROM MOVING AROUND CHROME FOR MAC SERIES
When rendering a page, however, the browser has a series of intermediate representations that aren’t directly exposed to developers. Once a page is loaded and parsed, it's represented in the browser as a structure many web developers are familiar with: DOM. Consider yourself forewarned! From the DOM to the Screen Introducing Layers When trying to improve the performance of your own site it can be helpful to understand the layer model, but it’s also easy to shoot yourself in the foot: layers are useful constructs, but creating lots of them can introduce overhead throughout the graphics stack. Lastly, we’re peeking under the hood of the rendering engine and looking at features of it that have a big impact on performance.
STOP FLASH VIDEOS FROM MOVING AROUND CHROME FOR MAC MAC
On Mac and Linux only pages that need compositing for some of their content go down the accelerated path (see below for more on what would require compositing), but soon all pages will go down the accelerated path there, too.
As of this writing all pages go down the hardware accelerated path on Windows, ChromeOS, and Chrome for Android.
STOP FLASH VIDEOS FROM MOVING AROUND CHROME FOR MAC SOFTWARE
It’s important to understand that Chrome has had two different rendering paths for a while now: the hardware-accelerated path and the older software path. This article attempts to cover only stuff that’s unlikely to change, but no guarantees that it’ll all still apply in six months. The web platform and standards don’t codify this level of implementation detail, so there are no guarantees anything in this article will apply to other browsers, but knowledge of internals can nevertheless be useful for advanced debugging and performance tuning.Īlso, note that this entire article is discussing a core piece of Chrome’s rendering architecture that’s changing very fast. This article covers implementation details of Chrome, not web platform features. We’re talking about WebKit here, and more specifically we’re talking about the Chromium port of WebKit. not Canvas2D or WebGL), what does that term really mean? This article explains the basic model that underpins hardware accelerated rendering of web content in Chrome. When talking about a normal web page (i.e.
Modern browsers have changed the way rendering works in recent years to take advantage of graphics cards: this is often vaguely referred to as “hardware acceleration”. Rendering is the often obscure process of turning this representation of a page into a picture on the screen. For most web developers the fundamental model of a web page is the DOM.
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