libcamera: software_isp: Add contrast control

This patch introduces support for applying runtime controls to software
ISP.  It enables the contrast control as the first control that can be
used.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/simple/algorithms/lut.cpp

@@ -24,6 +24,13 @@ LOG_DEFINE_CATEGORY(IPASoftLut)
 
 namespace ipa::soft::algorithms {
 
+int Lut::init(IPAContext &context,
+	      [[maybe_unused]] const YamlObject &tuningData)
+{
+	context.ctrlMap[&controls::Contrast] = ControlInfo(0.0f, 2.0f, 1.0f);
+	return 0;
+}
+
 int Lut::configure(IPAContext &context,
 		   [[maybe_unused]] const IPAConfigInfo &configInfo)
 {

src/ipa/simple/algorithms/lut.h

@@ -19,6 +19,7 @@ public:
 	Lut() = default;
 	~Lut() = default;
 
+	int init(IPAContext &context, const YamlObject &tuningData) override;
 	int configure(IPAContext &context, const IPAConfigInfo &configInfo) override;
 	void queueRequest(typename Module::Context &context,
 			  const uint32_t frame,