- Display list
A display list (or display file) is a series of graphics commands that define an output image. The image is created (rendered) by executing the commands.
For a display device without a frame buffer, such as the old vector graphics displays, the commands were executed every fraction of a second to maintain and animate the output. In modern systems, the commands need only be executed when they have changed or in order to refresh the output (e.g., when restoring a minimized window).
A display list can represent both two- and three-dimensional scenes. Systems that make use of a display list to store the scene are called retained mode systems as opposed to immediate mode systems.
Perhaps the earliest popular systems with true display list was the Atari 8-bit family. The display list (actually called so in Atari terminology) is a series of instructions for ANTIC, the video co-processor used in these machines. This program, stored in the computer's memory and executed by ANTIC in real time, controls the GTIA video interface controller chip to create the actual screen display.
In some older computer systems such as the Commodore 64, a display list can be defined as a CPU-driven series of writes to certain display-mode, color-control, or other visual effect registers in the video device, rather than a series of rendering commands. Thus, one must create the displayed image using some other rendering process either before or while the display list is operating. In many cases, the image is also modified or re-rendered between frames, often with the display list turned off during this time. The image is then displayed in various ways depending on the exact way in which the display list is implemented.
Examples of display lists on these older machines might include effects such as the Amiga's HAM modes, Commodore 64/128's FLI mode, or Rainbow Processing on the ZX Spectrum.
Many hardcopy devices also make use of display lists to avoid the necessity of a frame buffer. As an example, a high-resolution PostScript printer printing A4 pages at 600 dpi would need in excess of a gigabyte of RAM for its framebuffer. By converting the PostScript or other page description language input into a series of graphics commands, the contents of a page can usually be represented in a more modest amount of memory. The commands can then be scan converted (or rasterized) into pixels and fed to the printer engine a few scan lines at a time.
Wikimedia Foundation. 2010.
См. также в других словарях:
Display List — [dt. »Bildvorrat«], eine Technik zum Beschleunigen der grafischen Darstellung in CAD Systemen. Mit dieser Technik werden die Vektoren, die für die Bildschirmdarstellung berechnet werden müssen, nicht bei jedem Aufbau des Bildschirms neu… … Universal-Lexikon
Display — may refer to: Display (horse) (1923–1944), an American thoroughbred racehorse Display (zoology), a form of animal behaviour Display advertising, type that typically contains text, i.e., copy, logos, images, location maps, etc. Display case, also… … Wikipedia
List of Sega arcade system boards — The following is a list of arcade system boards released by Sega. Contents 1 Sega G80 1.1 G80 Specifications 2 Sega System 1 2.1 System 1 Specifications … Wikipedia
List of 16-bit computer hardware palettes — This is a list of color palettes of some of the most popular 16 bit personal computers, roughly those manufactured from 1985 to 1995. All of them are based on RGB palettes; although some output in composite video, the internal logic to produce… … Wikipedia
List of 8-bit computer hardware palettes — For a full listing of computer s color palettes, see List of palettes This is a list of color palettes of some of the most popular early 8 bit personal computers and terminals, roughly those manufactured from 1975 to 1985. Although some of them… … Wikipedia
List of color palettes — This article is a list of the color palettes for notable computer graphics, terminals and video game consoles hardware.Only a sample and the palette s name are given here. More specific articles are linked from the name of each palette, for the… … Wikipedia
List of videogame consoles palettes — For a full listing of computer s color palettes, see List of palettes This is a list of the full color palettes for notable video game consoles hardware.For color palettes of early 8 bit personal computers, see the List of 8 bit computer hardware … Wikipedia
List of monochrome and RGB palettes — For a full listing of computer s color palettes, see List of palettes This list of monochrome and RGB palettes includes generic repertoires of colors (color palettes) to produce black and white and RGB color pictures by a computer s display… … Wikipedia
List of Lord Provosts of Glasgow — The Lord Provost of Glasgow is the convener of the City of Glasgow council. They are elected by the city councillors and serve not only as the chair of that body, but as a figurehead for the entire city. [cite news |title=Lord Provost… … Wikipedia
List of archaeological sites and dismantled stave churches — List of archeological sites and dismantled stave churches in northern Europe. The list is still not complete, and will be continually revised as traces of churches are found all the time.: Back to the main article stave church Denmark * Iceland * … Wikipedia