#include "ofxImageEffect.h" #define kOfxImageEffectActionIsIdentity "OfxImageEffectActionIsIdentity"
handle handle to the instance, cast to an OfxImageEffectHandle,inArgs has the following properties...
kOfxPropTime - the time at which to test for identitykOfxImageEffectPropFieldToRender - the field to test for identitykOfxImageEffectPropRenderWindow - the window (in \ref PixelCoordinates) to test for identity underkOfxImageEffectPropRenderScale - the scale factor being applied to the images being renderredoutArgs has the following properties which the plugin can set...
kOfxPropName this to the name of the clip that should be used if the effect is an identity transform, defaults to the empty stringkOfxPropTime the time to use from the indicated source clip as an identity image (allowing time slips to happen), defaults to the value in kOfxPropTime in inArgs
Sometimes an effect can pass through an input uprocessed, for example a blur effect with a blur size of 0. This action can be called by a host before it attempts to render an effect to determine if it can simply copy input directly to output without having to call the render action on the effect.
If the effect does not need to process any pixels, it should set the value of the kOfxPropName to the clip that the host should us as the output instead, and the kOfxPropTime property on outArgs to be the time at which the frame should be fetched from a clip.
outArgs indicate what frame from which clip to use instead
The default action is to call the render action on the effect.