ipa: raspberrypi: Replace void cast with [[maybe_unused]]

The standard way in C++17 to specify that a function or function
argument may be unused it to specify the [[maybe_unused]] attribute.
Replace manual void casts to silence compiler warnings.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

5 files changed, 15 insertions, 23 deletions

diff --git a/src/ipa/raspberrypi/controller/algorithm.cpp b/src/ipa/raspberrypi/controller/algorithm.cpp
index 55cb2012..1b80e296 100644
--- a/src/ipa/raspberrypi/controller/algorithm.cpp
+++ b/src/ipa/raspberrypi/controller/algorithm.cpp
@@ -9,28 +9,24 @@
 
 using namespace RPi;
 
-void Algorithm::Read(boost::property_tree::ptree const &params)
+void Algorithm::Read([[maybe_unused]] boost::property_tree::ptree const &params)
 {
-	(void)params;
 }
 
 void Algorithm::Initialise() {}
 
-void Algorithm::SwitchMode(CameraMode const &camera_mode, Metadata *metadata)
+void Algorithm::SwitchMode([[maybe_unused]] CameraMode const &camera_mode,
+			   [[maybe_unused]] Metadata *metadata)
 {
-	(void)camera_mode;
-	(void)metadata;
 }
 
-void Algorithm::Prepare(Metadata *image_metadata)
+void Algorithm::Prepare([[maybe_unused]] Metadata *image_metadata)
 {
-	(void)image_metadata;
 }
 
-void Algorithm::Process(StatisticsPtr &stats, Metadata *image_metadata)
+void Algorithm::Process([[maybe_unused]] StatisticsPtr &stats,
+			[[maybe_unused]] Metadata *image_metadata)
 {
-	(void)stats;
-	(void)image_metadata;
 }
 
 // For registering algorithms with the system:
diff --git a/src/ipa/raspberrypi/controller/rpi/alsc.cpp b/src/ipa/raspberrypi/controller/rpi/alsc.cpp
index 9df713a3..0d0e0b0c 100644
--- a/src/ipa/raspberrypi/controller/rpi/alsc.cpp
+++ b/src/ipa/raspberrypi/controller/rpi/alsc.cpp
@@ -200,10 +200,9 @@ static bool compare_modes(CameraMode const &cm0, CameraMode const &cm1)
 	       top_diff > threshold_y || bottom_diff > threshold_y;
 }
 
-void Alsc::SwitchMode(CameraMode const &camera_mode, Metadata *metadata)
+void Alsc::SwitchMode(CameraMode const &camera_mode,
+		      [[maybe_unused]] Metadata *metadata)
 {
-	(void)metadata;
-
 	// We're going to start over with the tables if there's any "significant"
 	// change.
 	bool reset_tables = first_time_ || compare_modes(camera_mode_, camera_mode);
@@ -490,7 +489,7 @@ void compensate_lambdas_for_cal(double const cal_table[XY],
 		new_lambdas[i] /= min_new_lambda;
 }
 
-static void print_cal_table(double const C[XY])
+[[maybe_unused]] static void print_cal_table(double const C[XY])
 {
 	printf("table: [\n");
 	for (int j = 0; j < Y; j++) {
@@ -710,7 +709,6 @@ void Alsc::doAlsc()
 	resample_cal_table(cal_table_tmp, camera_mode_, cal_table_b);
 	// You could print out the cal tables for this image here, if you're
 	// tuning the algorithm...
-	(void)print_cal_table;
 	// Apply any calibration to the statistics, so the adaptive algorithm
 	// makes only the extra adjustments.
 	apply_cal_table(cal_table_r, Cr);
diff --git a/src/ipa/raspberrypi/controller/rpi/contrast.cpp b/src/ipa/raspberrypi/controller/rpi/contrast.cpp
index e4967990..c8d9ab61 100644
--- a/src/ipa/raspberrypi/controller/rpi/contrast.cpp
+++ b/src/ipa/raspberrypi/controller/rpi/contrast.cpp
@@ -137,9 +137,9 @@ Pwl apply_manual_contrast(Pwl const &gamma_curve, double brightness,
 	return new_gamma_curve;
 }
 
-void Contrast::Process(StatisticsPtr &stats, Metadata *image_metadata)
+void Contrast::Process(StatisticsPtr &stats,
+		       [[maybe_unused]] Metadata *image_metadata)
 {
-	(void)image_metadata;
 	double brightness = brightness_, contrast = contrast_;
 	Histogram histogram(stats->hist[0].g_hist, NUM_HISTOGRAM_BINS);
 	// We look at the histogram and adjust the gamma curve in the following
diff --git a/src/ipa/raspberrypi/controller/rpi/noise.cpp b/src/ipa/raspberrypi/controller/rpi/noise.cpp
index 2cafde3a..1b84ecb0 100644
--- a/src/ipa/raspberrypi/controller/rpi/noise.cpp
+++ b/src/ipa/raspberrypi/controller/rpi/noise.cpp
@@ -27,10 +27,9 @@ char const *Noise::Name() const
 	return NAME;
 }
 
-void Noise::SwitchMode(CameraMode const &camera_mode, Metadata *metadata)
+void Noise::SwitchMode(CameraMode const &camera_mode,
+		       [[maybe_unused]] Metadata *metadata)
 {
-	(void)metadata;
-
 	// For example, we would expect a 2x2 binned mode to have a "noise
 	// factor" of sqrt(2x2) = 2. (can't be less than one, right?)
 	mode_factor_ = std::max(1.0, camera_mode.noise_factor);
diff --git a/src/ipa/raspberrypi/controller/rpi/sharpen.cpp b/src/ipa/raspberrypi/controller/rpi/sharpen.cpp
index 2b701db5..356c1058 100644
--- a/src/ipa/raspberrypi/controller/rpi/sharpen.cpp
+++ b/src/ipa/raspberrypi/controller/rpi/sharpen.cpp
@@ -26,10 +26,9 @@ char const *Sharpen::Name() const
 	return NAME;
 }
 
-void Sharpen::SwitchMode(CameraMode const &camera_mode, Metadata *metadata)
+void Sharpen::SwitchMode(CameraMode const &camera_mode,
+			 [[maybe_unused]] Metadata *metadata)
 {
-	(void)metadata;
-
 	// can't be less than one, right?
 	mode_factor_ = std::max(1.0, camera_mode.noise_factor);
 }