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→Design: While an ordered list (array) may be faster to look up than a hash map, there’s no mention that an array is used Tags: Mobile edit Mobile web edit |
→Design: Hi-DPI displays are a thing now with resolutions over 200 dpi. Tags: Mobile edit Mobile web edit |
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* ''Halftone phase'': In order to improve scrolling performance, DPS only drew the small portion of the window that became visible, shifting the rest of the image instead of re-drawing it. However this meant that the [[halftone]]s might not line up, producing visible lines and boxes in the display of graphics. DPS included additional code to properly handle these cases. Modern full-color displays with no halftones have made this idea mostly obsolete.
* ''Incremental updates'': In printing applications the PS code is interpreted until it gets a <code>showpage</code> at which point it is actually printed out. This is not suitable for a display situation where a large number of minor updates are needed all the time. DPS included modes to allow semi-realtime display as the instructions were received from the user programs.
* ''Bitmap font support'': DPS added the ability to map PS fonts onto hand-drawn [[bitmap font]]s and change from one to the other on the fly. Adobe PS's ability to display fonts on low resolution devices (significantly less than 300 [[Dots per inch|dpi]]) was very poor. For example, a NeXT screen used only 96 dpi. This PS limitation was worked around by using hand-built bitmap fonts to provide passable quality. Later implementations of PS (including compatible replacements like [[Ghostscript]]) provided [[anti-aliased]] fonts on grayscale or colour displays, which significantly improved quality. However, this development was too late to be of much use. Modern displays are still around 100 dpi{{update after}}, but have very much superior font quality without using bitmap fonts.
* ''Programming language support'': DPS introduced the concept of a "<code>pswrap</code>", which allowed [[Software developer|developers]] to wrap PostScript code into a [[C (programming language)|C language]] function which could then be called from an application.
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