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 Graphics Administration Guide: HP 9000 Workstations and Servers > Chapter 4 X Windows, HP-UX 9.0x

CRX-24[Z] Device-Dependent Information
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Supported Visuals

The following visuals are supported:

  • Class PseudoColor Depth 8 Layer Image: supports DBE and MBX hardware double-buffering

  • Class PseudoColor Depth 8 Layer Overlay: supports DBE and MBX software double-buffering

  • Class DirectColor Depth 12 Layer Image: supports DBE and MBX hardware double-buffering

  • Class TrueColor Depth 12 Layer Image: supports DBE and MBX hardware double-buffering

  • Class DirectColor Depth 24 Layer Image: does not support DBE and MBX double-buffering

  • Class TrueColor Depth 24 Layer Image: does not support DBE and MBX double-buffering

Supported Environment Variables

The following environment variables are supported:

  • SWAP_BUFFERS_ON_VBLANK

  • HP_COUNT_TRANSPARENT_IN_OVERLAY_VISUAL

  • HPGCRX_IMAGETEXT_VIA_BITMAP

CRX-24[Z] Transparent Overlay Visuals

The default number of colormap entries in the overlay visual for the CRX-24[Z] is 255. Entry 255 is excluded because its value is hard-coded to transparent (that is, show the image planes).

This may have the following two consequences for X11 applications running in the overlay planes (the default visual):

  • Clients attempting to allocate 256 entries do not have their request granted.

  • Clients requesting (via XAllocNamedColor) the rgb.txt value of Transparent are not returned entry 255.

This default behavior can be changed by setting the environment variable HP_COUNT_TRANSPARENT_IN_OVERLAY_VISUAL to any value. When this option is enabled, the X server does the following:

  • Specifies that the overlay visual has 256 entries.

  • Creates the default colormap with entry 255 pre-allocated to Transparent. A client calling XAllocNamedColor for entry Transparent in the default colormap will be returned entry 255.

  • For all other colormaps, returns all 256 entries as allocable, but issues a warning message:

        Warning:  XCreateColormap is creating 256 entry cmaps in overlay visual.
        Though allocable, entry 255 is hard-coded to transparency.

    This warning is issued once per server execution.



Internal Color Graphics, Internal GrayScale Graphics, CRX, GRX, andDual-CRX Device-Dependent Information
  		 


CRX-48Z Device-Dependent Information  
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