[PATCH 1/4] libipa: FrameContext: Move init() to FrameContext

[Jacopo Mondi]

The FCtQueue structure initializes a new FrameContext using its init()
function. In case of request underrun, where a FrameContext is
initialized without application's controls being supplied, the
FrameContext needs to be initialized to default values.

In order to allow the single IPAs to initialize a FrameContext to
the desired default values, move the init() function to the FrameContext
structure, which each IPA derives to a per-IPA type.

In this way each IPA can override the FrameContext::init() function
and initialize the FrameContext to the desired default values.

Signed-off-by: Jacopo Mondi <jacopo.mondi at ideasonboard.com>
---
 src/ipa/libipa/fc_queue.cpp    | 10 ++++++++++
 src/ipa/libipa/fc_queue.h      | 16 ++++++++--------
 src/ipa/rkisp1/ipa_context.cpp |  5 +++++
 src/ipa/rkisp1/ipa_context.h   |  2 ++
 4 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/src/ipa/libipa/fc_queue.cpp b/src/ipa/libipa/fc_queue.cpp
index 0365e9197748..fa2454fd5706 100644
--- a/src/ipa/libipa/fc_queue.cpp
+++ b/src/ipa/libipa/fc_queue.cpp
@@ -38,6 +38,16 @@ namespace ipa {
  * \brief The frame number
  */
 
+/**
+ * \fn FrameContext::init()
+ * \brief Initialize a frame context
+ * \param[in] frameNum The frame number to assign to this FrameContext
+ *
+ * This function initializes a frame context by assigning it a frame number.
+ * The single IPA modules are expected to override this function to initialize
+ * their derived FrameContext implementation to their desired default values.
+ */
+
 /**
  * \class FCQueue
  * \brief A support class for managing FrameContext instances in IPA modules
diff --git a/src/ipa/libipa/fc_queue.h b/src/ipa/libipa/fc_queue.h
index 24d9e82b727d..b1e8bc1485d4 100644
--- a/src/ipa/libipa/fc_queue.h
+++ b/src/ipa/libipa/fc_queue.h
@@ -22,6 +22,12 @@ template<typename FrameContext>
 class FCQueue;
 
 struct FrameContext {
+protected:
+	virtual void init(const uint32_t frameNum)
+	{
+		frame = frameNum;
+	}
+
 private:
 	template<typename T> friend class FCQueue;
 	uint32_t frame;
@@ -61,7 +67,7 @@ public:
 			LOG(FCQueue, Warning)
 				<< "Frame " << frame << " already initialised";
 		else
-			init(frameContext, frame);
+			frameContext.init(frame);
 
 		return frameContext;
 	}
@@ -98,18 +104,12 @@ public:
 		LOG(FCQueue, Warning)
 			<< "Obtained an uninitialised FrameContext for " << frame;
 
-		init(frameContext, frame);
+		frameContext.init(frame);
 
 		return frameContext;
 	}
 
 private:
-	void init(FrameContext &frameContext, const uint32_t frame)
-	{
-		frameContext = {};
-		frameContext.frame = frame;
-	}
-
 	std::vector<FrameContext> contexts_;
 };
 
diff --git a/src/ipa/rkisp1/ipa_context.cpp b/src/ipa/rkisp1/ipa_context.cpp
index 14d0c02a2b32..4e4fe5f4ae96 100644
--- a/src/ipa/rkisp1/ipa_context.cpp
+++ b/src/ipa/rkisp1/ipa_context.cpp
@@ -417,6 +417,11 @@ namespace libcamera::ipa::rkisp1 {
  * \brief Analogue gain multiplier
  */
 
+void IPAFrameContext::init(const uint32_t frameNum)
+{
+	FrameContext::init(frameNum);
+}
+
 /**
  * \struct IPAContext
  * \brief Global IPA context data shared between all algorithms
diff --git a/src/ipa/rkisp1/ipa_context.h b/src/ipa/rkisp1/ipa_context.h
index e274d9b01e1c..51e04bc30627 100644
--- a/src/ipa/rkisp1/ipa_context.h
+++ b/src/ipa/rkisp1/ipa_context.h
@@ -177,6 +177,8 @@ struct IPAFrameContext : public FrameContext {
 	struct {
 		Matrix<float, 3, 3> ccm;
 	} ccm;
+
+	void init(const uint32_t frame) override;
 };
 
 struct IPAContext {
-- 
2.47.0