HP Visualize J5000 hp workstations - hp-ux 10.20 graphics administration guide - Page 62

Overlay Transparency on the HCRX-24[Z], HP VISUALIZE-24, and, The HCRX-24[Z]

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Overlay Transparency on the HCRX-24[Z], HP VISUALIZE-24, and HP VISUALIZE-48[XP] The HCRX-24[Z], HP VISUALIZE-24, and HP VISUALIZE-48[XP] have two visuals in the overlay planes, both depth-8 PseudoColor. The default overlay visual has 256 entries per colormap and no transparency. The second overlay visual has 255 entries per colormap and supports transparency in the same way as the CRX-24[Z]. As on the CRX-24[Z] and CRX-48Z, the screen option EnableOverlayTransparency can be used to include the transparent index in the colormap size (256 entries instead of 255). To allow applications to determine which visuals are in the overlay planes, both overlay visuals are listed in the SERVER_OVERLAY_VISUALS property attached to the root window. The default overlay visual has a transparent type of 0 (None) while the transparent 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. To look at the contents of this property, you would use code similar to the following: { typedef struct { VisualID overlayVisualID; Card32 transparentType;/* None, TransparentPixel, TransparentMask */ Card32 value; /* Either pixel value or pixel mask */ Card32 layer; } OverlayVisualPropertyRec; OverlayVisualPropertyRec *pOverlayVisuals, *pOVis; XVisualInfo getVis; XVisualInfo *pVisuals; Atom overlayVisualsAtom, actualType; ... /* Get the visuals for this screen and allocate. */ getVis.screen = screen; pVisuals = XGetVisualInfo(display, VisualScreenMask, &getVis, &nVisuals); pOverlayVisuals = (OverlayVisualPropertyRec *) malloc ( (size_t)nVisuals * sizeof(OverlayVisualPropertyRec) ); /* Get the overlay visual information for this screen. Obtain * this information from the SERVER_OVERLAY_VISUALS property. */ overlayVisualsAtom = XInternAtom(display, "SERVER_OVERLAY_VISUALS", True); if (overlayVisualsAtom != None) Page 62 Graphics Administration Guide for HP-UX 10.20

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Overlay Transparency on the HCRX-24[Z], HP VISUALIZE-24, and HP
VISUALIZE-48[XP]
The HCRX-24[Z], HP VISUALIZE-24, and HP VISUALIZE-48[XP] have two visuals in the overlay
planes, both depth-8 PseudoColor.
The default overlay visual has 256 entries per colormap and no transparency.
The second overlay visual has 255 entries per colormap and supports transparency in the same way as
the CRX-24[Z]. As on the CRX-24[Z] and CRX-48Z, the screen option EnableOverlayTransparency can
be used to include the transparent index in the colormap size (256 entries instead of 255).
To allow applications to determine which visuals are in the overlay planes, both overlay visuals are
listed in the SERVER_OVERLAY_VISUALS property attached to the root window. The default
overlay visual has a transparent type of 0 (None) while the transparent 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. To look at the contents of this
property, you would use code similar to the following:
{
typedef struct {
VisualID
overlayVisualID;
Card32
transparentType;/* None, TransparentPixel, TransparentMask */
Card32
value;
/* Either pixel value or pixel mask */
Card32
layer;
} OverlayVisualPropertyRec;
OverlayVisualPropertyRec
*pOverlayVisuals, *pOVis;
XVisualInfo
getVis;
XVisualInfo
*pVisuals;
Atom
overlayVisualsAtom, actualType;
...
/* Get the visuals for this screen and allocate. */
getVis.screen = screen;
pVisuals = XGetVisualInfo(display, VisualScreenMask, &getVis, &nVisuals);
pOverlayVisuals = (OverlayVisualPropertyRec *)
malloc ( (size_t)nVisuals * sizeof(OverlayVisualPropertyRec) );
/* Get the overlay visual information for this screen.
Obtain
* this information from the SERVER_OVERLAY_VISUALS property. */
overlayVisualsAtom = XInternAtom(display, "SERVER_OVERLAY_VISUALS", True);
if (overlayVisualsAtom != None)
Graphics Administration Guide for HP-UX 10.20
Page 62