ipa: rkisp1: Convert to use the FCQueue

Establish a queue of FrameContexts using the new FCQueue and use it to
supply the FrameContext to the algorithms.

The algorithms on the RKISP1 do not use this yet themselves, but are
able to do so after the introduction of this patch.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/ipa/rkisp1/ipa_context.cpp

@@ -205,8 +205,7 @@ namespace libcamera::ipa::rkisp1 {
  * \struct IPAFrameContext
  * \brief Per-frame context for algorithms
  *
- * This structure is currently unused and will be replaced by a real per-frame
- * context.
+ * \todo Populate the frame context for all algorithms
  */
 
 /**
@@ -219,7 +218,8 @@ namespace libcamera::ipa::rkisp1 {
  * \var IPAContext::activeState
  * \brief The IPA active state, storing the latest state for all algorithms
  *
- * \todo Introduce per-frame contexts
+ * \var IPAContext::frameContexts
+ * \brief Ring buffer of per-frame contexts
  */
 
 } /* namespace libcamera::ipa::rkisp1 */