[PATCH 04/19] libcamera: software_isp: Define skeletons for IPA refactoring

[Milan Zamazal]

Software ISP image processing algorithms are currently defined in a
simplified way, different from other libcamera pipelines.  This is not
good for several reasons:

- It makes the software ISP code harder to understand due to its
  different structuring.
- Adding more algorithms may make the code harder to understand
  generally.
- Mass libcamera code changes may not be easily applicable to software
  ISP.
- Algorithm sharing with other pipelines is not easily possible.

This patch introduces basic software ISP IPA skeletons structured
similarly to the other pipelines.  The newly added files are currently
not used or compiled and the general skeleton structures don't contain
anything particular.  It is just a preparation step for a larger
refactoring and the code will be actually used and extended as needed in
followup patches.

Signed-off-by: Milan Zamazal <mzamazal at redhat.com>
---
 src/ipa/simple/algorithms/algorithm.h | 22 +++++++++++++++++
 src/ipa/simple/ipa_context.h          | 34 +++++++++++++++++++++++++++
 src/ipa/simple/module.h               | 30 +++++++++++++++++++++++
 3 files changed, 86 insertions(+)
 create mode 100644 src/ipa/simple/algorithms/algorithm.h
 create mode 100644 src/ipa/simple/ipa_context.h
 create mode 100644 src/ipa/simple/module.h

diff --git a/src/ipa/simple/algorithms/algorithm.h b/src/ipa/simple/algorithms/algorithm.h
new file mode 100644
index 00000000..41f63170
--- /dev/null
+++ b/src/ipa/simple/algorithms/algorithm.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2024 Red Hat, Inc.
+ *
+ * Software ISP control algorithm interface
+ */
+
+#pragma once
+
+#include <libipa/algorithm.h>
+
+#include "module.h"
+
+namespace libcamera {
+
+namespace ipa::soft {
+
+using Algorithm = libcamera::ipa::Algorithm<Module>;
+
+} /* namespace ipa::soft */
+
+} /* namespace libcamera */
diff --git a/src/ipa/simple/ipa_context.h b/src/ipa/simple/ipa_context.h
new file mode 100644
index 00000000..bc1235b6
--- /dev/null
+++ b/src/ipa/simple/ipa_context.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2024 Red Hat, Inc.
+ *
+ * Simple pipeline IPA Context
+ *
+ */
+
+#pragma once
+
+#include <libipa/fc_queue.h>
+
+namespace libcamera {
+
+namespace ipa::soft {
+
+struct IPASessionConfiguration {
+};
+
+struct IPAActiveState {
+};
+
+struct IPAFrameContext : public FrameContext {
+};
+
+struct IPAContext {
+	IPASessionConfiguration configuration;
+	IPAActiveState activeState;
+	FCQueue<IPAFrameContext> frameContexts;
+};
+
+} /* namespace ipa::soft */
+
+} /* namespace libcamera */
diff --git a/src/ipa/simple/module.h b/src/ipa/simple/module.h
new file mode 100644
index 00000000..21328ecd
--- /dev/null
+++ b/src/ipa/simple/module.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2024 Red Hat, Inc.
+ *
+ * Software ISP IPA Module
+ */
+
+#pragma once
+
+#include <libcamera/controls.h>
+
+#include <libcamera/ipa/core_ipa_interface.h>
+
+#include "libcamera/internal/software_isp/debayer_params.h"
+#include "libcamera/internal/software_isp/swisp_stats.h"
+
+#include <libipa/module.h>
+
+#include "ipa_context.h"
+
+namespace libcamera {
+
+namespace ipa::soft {
+
+using Module = ipa::Module<IPAContext, IPAFrameContext, ControlInfoMap,
+			   DebayerParams, SwIspStats>;
+
+} /* namespace ipa::soft */
+
+} /* namespace libcamera */
-- 
2.44.1