Ati Firegl X1/T2/X3 Configuration Hints; Overlay Visuals And Overlay Transparency; Colormaps; Gamma Correction - HP c3700 - Workstation Administration Manual

Graphics administration guide

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configuring X Windows on HP-UX (other graphics cards)

ATI FireGL X1/T2/X3 configuration hints

FireGL devices support both depth 8 PseudoColor and depth 24

TrueColor overlay visuals. The depth 8 PseudoColor visuals with

transparency are enabled by default for compatibility with previous

devices. An opaque depth 8 PseudoColor visual can be enabled by setting

the EnableOpaqueOverlayVisual screen option described in the previous

section. This option is useful for applications that require allocation of

all 256 entries in the colormap with no index mapping to transparency.

The SERVER_OVERLAY_VISUALS property is attached to the root

window. The default overlay visual has a transparent type of "1"

(TransparentPixel). If you need an overlay colormap that supports

transparency, create the colormap using the visual that has

transparency in its SERVER_OVERLAY_VISUALS property. See the

Fire GL-UX configuration hints section for a code fragment .

The depth 24 TrueColor overlay visual is enabled by setting the

TrueColorOverlay screen option described in the previous section. To

make the TrueColor overlay visual the default, also set the

DefaultVisualTrueColor screen option. The

SERVER_OVERLAY_VISUALS property will not report this visual.

Overlay visuals are disabled completely when a Single Logical Screen

configuration is enabled, or when using a display with at width of greater

than 1920 pixels.

FireGL devices have a colormap per window for windows created in the

overlay visuals. There is a single colormap in the image planes. The

image colormap is reserved for gamma correction and is not directly

available to X clients.

Chapter 3

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