ipa: rkisp1: dpf: Store per-frame information in frame context

Rework the algorithm's usage of the active state, to store the value of
controls for the last queued request in the queueRequest() function, and
store a copy of the values in the corresponding frame context. The
latter is used in the prepare() function to populate the ISP parameters
with values corresponding to the right frame.

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

src/ipa/rkisp1/ipa_context.cpp

@@ -168,9 +168,6 @@ namespace libcamera::ipa::rkisp1 {
  *
  * \var IPAActiveState::dpf.denoise
  * \brief Indicates if denoise is activated
- *
- * \var IPAActiveState::dpf.updateParams
- * \brief Indicates if ISP parameters need to be updated
  */
 
 /**
@@ -251,6 +248,18 @@ namespace libcamera::ipa::rkisp1 {
  * compared to the previous frame
  */
 
+/**
+ * \var IPAFrameContext::dpf
+ * \brief Denoise Pre-Filter parameters for this frame
+ *
+ * \var IPAFrameContext::dpf.denoise
+ * \brief Indicates if denoise is activated
+ *
+ * \var IPAFrameContext::dpf.update
+ * \brief Indicates if the denoise pre-filter parameters have been updated
+ * compared to the previous frame
+ */
+
 /**
  * \var IPAFrameContext::sensor
  * \brief Sensor configuration that used been used for this frame