Imaging Property Types
The
imagingProperty
parameter of the functions
QTVRGetImagingProperty
and
QTVRSetImagingProperty
specifies the type of imaging property of a panoramic node whose value you want to get or set. These constants define the available imaging properties:
enum {
kQTVRImagingCorrection = 1,
kQTVRImagingQuality = 2,
kQTVRImagingDirectDraw = 3,
kQTVRImagingCurrentMode = 100
};
#define kQTVRImagingDefaultValue 0x80000000
Constant descriptions
-
kQTVRImagingCorrection
-
The correction mode property. This property determines the type of image correction to be applied when imaging a panoramic view. The acceptable values for this property type are described in
"Correction Modes"
.
-
kQTVRImagingQuality
-
The imaging quality property. This property determines the quality of the output image. The acceptable values for this property type are described in
"Quality Properties"
.
-
kQTVRImagingDirectDraw
-
The direct-drawing property. This property determines the immediate destination of an image. The value of this property (as specified by the
propertyValue
parameter) is interpreted as a Boolean value. If the value is
true
, then images are computed and drawn directly to the final destination without first being drawn in the prescreen buffer maintained by QuickTime VR. This value provides the fastest overall frame rate but may result in relatively slower individual frame drawing for high-quality, high-resolution images on lower performance systems. If the value of this property is
false
, then images are computed and drawn first into the prescreen buffer and then to the final destination. This value provides the shortest imaging time for each individual frame but results in a reduced overall frame rate.
-
kQTVRImagingCurrentMode
-
The current imaging mode property. When you pass this property selector to the
QTVRGetImagingProperty
function, it returns, in the
propertyValue
parameter, the current imaging mode (that is, either
kQTVRStatic
or
kQTVRMotion
). If the
kQTVRImagingDefaultValue
bit is set, the default imaging mode is returned. You can get but not set the value of this property. You might want to determine the current imaging mode in an imaging callback procedure if what you draw depends on the current imaging mode.
-
kQTVRImagingDefaultValue
-
The default value specifier. You can OR this value with any of the imaging property types to get or set the default value of that property type.
The
kQTVRImagingDirectDraw
property cannot always be supported. During updates, QuickTime VR's warping engine might ignore a value of
true
and draw the image first into the prescreen buffer and then into the final destination.
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