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HP-UX Starbase Device Drivers Manual - Vol1: HP 9000 Series 700 Computers > Chapter 3 The HCRX Family of Device Drivers

Special Device Characteristics

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Device Coordinate Addressing

For device coordinate operations, location (0, 0) is the upper-left corner of the window with X-axis values increasing to the right and Y-axis values increasing down.

Use this form of pixel addressing when calling high-level Starbase operations in terms of (x,y) device coordinates.

Figure 3-4 Device Coordinates

Device Coordinates

Dither Default

If the number of colors specified by fill_dither is 1, dithering is disabled. However, if the number of colors specified is greater than 1, the default dither cell size of 16 is used. Dithering is only used in depth 8 windows while in either the CMAP_FULL or CMAP_MONOTONIC color map mode, or in depth 12 windows in CMAP_FULL mode.

If the number of colors specified by fill_dither is 1, dithering is disabled. However, if the number of colors specified is greater than 1, a dither cell size of 16 is used. Dithering is only used in depth 8 windows while in either the CMAP_FULL or CMAP_MONOTONIC color map mode.

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