Integrated Color Graphics Device-Dependent Information; Supported Visuals; Supported Screen Options; Colormaps And Colormap Management - HP b2600 Administration Manual

Integrated Color Graphics Device-Dependent Information

This sections includes information on Integrated Color Graphics and Color Graphics cards.

Supported Visuals

For color displays:
• Class PseudoColor Depth 8 -
supports DBE and MBX software double-buffering
• Class TrueColor Depth 8 -
supports DBE and MBX software double-buffering
For grayscale displays, only one visual is supported:
• Class GrayScale Depth 8 -
supports DBE and MBX software double-buffering

Supported Screen Options

The following Screen Options are supported:
• DisableColorRecovery
• 3BitCenterColor
• ImageTextViaBitMap

Colormaps and Colormap Management

Color Graphics devices have two hardware colormaps (color lookup tables), each with 256 entries. The
X server controls the allocation and contents of these hardware colormaps.
Default Colormap Management Scheme
Many applications use the default X11 colormap. A technicolor effect in the windows using the default
colormap occurs when a non-default colormap is downloaded in the hardware colormap that had
previously contained the default colormap.
Because so many applications use the default X11 colormap, including the window manager, and
because Color Graphics devices have two hardware colormaps, the default behavior on this device is to
dedicate one hardware colormap to always hold the default X11 colormap. The second hardware
colormap is available to applications that use colormaps other than the default.
The default behavior can cause technicolor if two or more applications are using different, non-default
colormaps. For example, Application A uses the default X11 colormap, Application B uses a different
colormap, and Application C uses a third colormap. If applications A, B, and C are all executed
simultaneously on a Model 712, application A would look correct. Either application B or C would have
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Graphics Administration Guide for HP-UX 10.20