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Quartz (graphics layer) - Wikipedia, the free encyclopedia

Quartz (graphics layer)

From Wikipedia, the free encyclopedia

Quartz is the marketing name of the graphics layer of the Mac OS X operating system. Quartz is part of the Core Graphics framework. In Mac OS X 10.4, Core Image and Core Video extend Quartz to provide real-time video and graphics manipulation.

[edit] Capabilities

There are two components that make up Quartz: Quartz Compositor, a compositing windowing system that manages and composites off-screen window bitmaps to create the Mac OS X user interface; and Quartz 2D, a two dimensional text and graphics drawing library based on the paradigms of the Portable Document Format.

Quartz directly supports Aqua by displaying two-dimensional graphics to create the user interface, including on-the-fly rendering and anti-aliasing. Quartz can render text with sub-pixel precision; graphics are limited to more traditional anti-aliasing, which is the default mode of operation but can be turned off.

If available, Quartz makes use of AltiVec and supported GPUs to improve performance. This feature is marketed as Quartz Extreme. A separate technology called Quartz 2D Extreme accelerates Quartz 2D using the GPU. Quartz 2D Extreme was introduced in Mac OS X Tiger, but was disabled by default; Apple strongly cautioned against using it because of bugs which could cause visual anomalies and crashes. In the 10.4.3 maintenance update, Apple removed Quartz 2D Extreme, but it returned in 10.4.4, still disabled by default.

[edit] Use of PDF

It is widely stated that Quartz "uses PDF" internally, often by people making comparisons with the Display PostScript technology used in NeXTSTEP and OPENSTEP. Quartz's internal imaging model correlates well with the PDF imaging model making it easy to output PDF to multiple devices, but Quartz does not use PDF as an internal representation.

[edit] External links

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