1 files changed, 0 insertions, 185 deletions
diff --git a/src/ipa/raspberrypi/controller/rpi/contrast.cpp b/src/ipa/raspberrypi/controller/rpi/contrast.cpp
deleted file mode 100644
index ae55aad5..00000000
--- a/src/ipa/raspberrypi/controller/rpi/contrast.cpp
+++ /dev/null
@@ -1,185 +0,0 @@
-/* SPDX-License-Identifier: BSD-2-Clause */
-/*
- * Copyright (C) 2019, Raspberry Pi (Trading) Limited
- *
- * contrast.cpp - contrast (gamma) control algorithm
- */
-#include <stdint.h>
-
-#include <libcamera/base/log.h>
-
-#include "../contrast_status.h"
-#include "../histogram.hpp"
-
-#include "contrast.hpp"
-
-using namespace RPiController;
-using namespace libcamera;
-
-LOG_DEFINE_CATEGORY(RPiContrast)
-
-// This is a very simple control algorithm which simply retrieves the results of
-// AGC and AWB via their "status" metadata, and applies digital gain to the
-// colour channels in accordance with those instructions. We take care never to
-// apply less than unity gains, as that would cause fully saturated pixels to go
-// off-white.
-
-#define NAME "rpi.contrast"
-
-Contrast::Contrast(Controller *controller)
-	: ContrastAlgorithm(controller), brightness_(0.0), contrast_(1.0)
-{
-}
-
-char const *Contrast::Name() const
-{
-	return NAME;
-}
-
-void Contrast::Read(boost::property_tree::ptree const &params)
-{
-	// enable adaptive enhancement by default
-	config_.ce_enable = params.get<int>("ce_enable", 1);
-	// the point near the bottom of the histogram to move
-	config_.lo_histogram = params.get<double>("lo_histogram", 0.01);
-	// where in the range to try and move it to
-	config_.lo_level = params.get<double>("lo_level", 0.015);
-	// but don't move by more than this
-	config_.lo_max = params.get<double>("lo_max", 500);
-	// equivalent values for the top of the histogram...
-	config_.hi_histogram = params.get<double>("hi_histogram", 0.95);
-	config_.hi_level = params.get<double>("hi_level", 0.95);
-	config_.hi_max = params.get<double>("hi_max", 2000);
-	config_.gamma_curve.Read(params.get_child("gamma_curve"));
-}
-
-void Contrast::SetBrightness(double brightness)
-{
-	brightness_ = brightness;
-}
-
-void Contrast::SetContrast(double contrast)
-{
-	contrast_ = contrast;
-}
-
-static void fill_in_status(ContrastStatus &status, double brightness,
-			   double contrast, Pwl &gamma_curve)
-{
-	status.brightness = brightness;
-	status.contrast = contrast;
-	for (int i = 0; i < CONTRAST_NUM_POINTS - 1; i++) {
-		int x = i < 16 ? i * 1024
-			       : (i < 24 ? (i - 16) * 2048 + 16384
-					 : (i - 24) * 4096 + 32768);
-		status.points[i].x = x;
-		status.points[i].y = std::min(65535.0, gamma_curve.Eval(x));
-	}
-	status.points[CONTRAST_NUM_POINTS - 1].x = 65535;
-	status.points[CONTRAST_NUM_POINTS - 1].y = 65535;
-}
-
-void Contrast::Initialise()
-{
-	// Fill in some default values as Prepare will run before Process gets
-	// called.
-	fill_in_status(status_, brightness_, contrast_, config_.gamma_curve);
-}
-
-void Contrast::Prepare(Metadata *image_metadata)
-{
-	std::unique_lock<std::mutex> lock(mutex_);
-	image_metadata->Set("contrast.status", status_);
-}
-
-Pwl compute_stretch_curve(Histogram const &histogram,
-			  ContrastConfig const &config)
-{
-	Pwl enhance;
-	enhance.Append(0, 0);
-	// If the start of the histogram is rather empty, try to pull it down a
-	// bit.
-	double hist_lo = histogram.Quantile(config.lo_histogram) *
-			 (65536 / NUM_HISTOGRAM_BINS);
-	double level_lo = config.lo_level * 65536;
-	LOG(RPiContrast, Debug)
-		<< "Move histogram point " << hist_lo << " to " << level_lo;
-	hist_lo = std::max(
-		level_lo,
-		std::min(65535.0, std::min(hist_lo, level_lo + config.lo_max)));
-	LOG(RPiContrast, Debug)
-		<< "Final values " << hist_lo << " -> " << level_lo;
-	enhance.Append(hist_lo, level_lo);
-	// Keep the mid-point (median) in the same place, though, to limit the
-	// apparent amount of global brightness shift.
-	double mid = histogram.Quantile(0.5) * (65536 / NUM_HISTOGRAM_BINS);
-	enhance.Append(mid, mid);
-
-	// If the top to the histogram is empty, try to pull the pixel values
-	// there up.
-	double hist_hi = histogram.Quantile(config.hi_histogram) *
-			 (65536 / NUM_HISTOGRAM_BINS);
-	double level_hi = config.hi_level * 65536;
-	LOG(RPiContrast, Debug)
-		<< "Move histogram point " << hist_hi << " to " << level_hi;
-	hist_hi = std::min(
-		level_hi,
-		std::max(0.0, std::max(hist_hi, level_hi - config.hi_max)));
-	LOG(RPiContrast, Debug)
-		<< "Final values " << hist_hi << " -> " << level_hi;
-	enhance.Append(hist_hi, level_hi);
-	enhance.Append(65535, 65535);
-	return enhance;
-}
-
-Pwl apply_manual_contrast(Pwl const &gamma_curve, double brightness,
-			  double contrast)
-{
-	Pwl new_gamma_curve;
-	LOG(RPiContrast, Debug)
-		<< "Manual brightness " << brightness << " contrast " << contrast;
-	gamma_curve.Map([&](double x, double y) {
-		new_gamma_curve.Append(
-			x, std::max(0.0, std::min(65535.0,
-						  (y - 32768) * contrast +
-							  32768 + brightness)));
-	});
-	return new_gamma_curve;
-}
-
-void Contrast::Process(StatisticsPtr &stats,
-		       [[maybe_unused]] Metadata *image_metadata)
-{
-	Histogram histogram(stats->hist[0].g_hist, NUM_HISTOGRAM_BINS);
-	// We look at the histogram and adjust the gamma curve in the following
-	// ways: 1. Adjust the gamma curve so as to pull the start of the
-	// histogram down, and possibly push the end up.
-	Pwl gamma_curve = config_.gamma_curve;
-	if (config_.ce_enable) {
-		if (config_.lo_max != 0 || config_.hi_max != 0)
-			gamma_curve = compute_stretch_curve(histogram, config_)
-					      .Compose(gamma_curve);
-		// We could apply other adjustments (e.g. partial equalisation)
-		// based on the histogram...?
-	}
-	// 2. Finally apply any manually selected brightness/contrast
-	// adjustment.
-	if (brightness_ != 0 || contrast_ != 1.0)
-		gamma_curve = apply_manual_contrast(gamma_curve, brightness_,
-						    contrast_);
-	// And fill in the status for output. Use more points towards the bottom
-	// of the curve.
-	ContrastStatus status;
-	fill_in_status(status, brightness_, contrast_, gamma_curve);
-	{
-		std::unique_lock<std::mutex> lock(mutex_);
-		status_ = status;
-	}
-}
-
-// Register algorithm with the system.
-static Algorithm *Create(Controller *controller)
-{
-	return (Algorithm *)new Contrast(controller);
-}
-static RegisterAlgorithm reg(NAME, &Create);