pipeline: ipa: raspberrypi: Refactor and move the Raspberry Pi code

Split the Raspberry Pi pipeline handler and IPA source code into common
and VC4/BCM2835 specific file structures.

For the pipeline handler, the common code files now live in
src/libcamera/pipeline/rpi/common/
and the VC4-specific files in src/libcamera/pipeline/rpi/vc4/.

For the IPA, the common code files now live in
src/ipa/rpi/{cam_helper,controller}/
and the vc4 specific files in src/ipa/rpi/vc4/. With this change, the
camera tuning files are now installed under share/libcamera/ipa/rpi/vc4/.

To build the pipeline and IPA, the meson configuration options have now
changed from "raspberrypi" to "rpi/vc4":

meson setup build -Dipas=rpi/vc4 -Dpipelines=rpi/vc4

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 0 insertions, 181 deletions

diff --git a/src/ipa/raspberrypi/controller/rpi/contrast.cpp b/src/ipa/raspberrypi/controller/rpi/contrast.cpp
deleted file mode 100644
index bee1eadd..00000000
--- a/src/ipa/raspberrypi/controller/rpi/contrast.cpp
+++ /dev/null
@@ -1,181 +0,0 @@
-/* SPDX-License-Identifier: BSD-2-Clause */
-/*
- * Copyright (C) 2019, Raspberry Pi Ltd
- *
- * contrast.cpp - contrast (gamma) control algorithm
- */
-#include <stdint.h>
-
-#include <libcamera/base/log.h>
-
-#include "../contrast_status.h"
-#include "../histogram.h"
-
-#include "contrast.h"
-
-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;
-}
-
-int Contrast::read(const libcamera::YamlObject &params)
-{
-	// enable adaptive enhancement by default
-	config_.ceEnable = params["ce_enable"].get<int>(1);
-	// the point near the bottom of the histogram to move
-	config_.loHistogram = params["lo_histogram"].get<double>(0.01);
-	// where in the range to try and move it to
-	config_.loLevel = params["lo_level"].get<double>(0.015);
-	// but don't move by more than this
-	config_.loMax = params["lo_max"].get<double>(500);
-	// equivalent values for the top of the histogram...
-	config_.hiHistogram = params["hi_histogram"].get<double>(0.95);
-	config_.hiLevel = params["hi_level"].get<double>(0.95);
-	config_.hiMax = params["hi_max"].get<double>(2000);
-	return config_.gammaCurve.read(params["gamma_curve"]);
-}
-
-void Contrast::setBrightness(double brightness)
-{
-	brightness_ = brightness;
-}
-
-void Contrast::setContrast(double contrast)
-{
-	contrast_ = contrast;
-}
-
-void Contrast::initialise()
-{
-	/*
-	 * Fill in some default values as Prepare will run before Process gets
-	 * called.
-	 */
-	status_.brightness = brightness_;
-	status_.contrast = contrast_;
-	status_.gammaCurve = config_.gammaCurve;
-}
-
-void Contrast::prepare(Metadata *imageMetadata)
-{
-	imageMetadata->set("contrast.status", status_);
-}
-
-Pwl computeStretchCurve(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 histLo = histogram.quantile(config.loHistogram) *
-			(65536 / histogram.bins());
-	double levelLo = config.loLevel * 65536;
-	LOG(RPiContrast, Debug)
-		<< "Move histogram point " << histLo << " to " << levelLo;
-	histLo = std::max(levelLo,
-			  std::min(65535.0, std::min(histLo, levelLo + config.loMax)));
-	LOG(RPiContrast, Debug)
-		<< "Final values " << histLo << " -> " << levelLo;
-	enhance.append(histLo, levelLo);
-	/*
-	 * 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 / histogram.bins());
-	enhance.append(mid, mid);
-
-	/*
-	 * If the top to the histogram is empty, try to pull the pixel values
-	 * there up.
-	 */
-	double histHi = histogram.quantile(config.hiHistogram) *
-			(65536 / histogram.bins());
-	double levelHi = config.hiLevel * 65536;
-	LOG(RPiContrast, Debug)
-		<< "Move histogram point " << histHi << " to " << levelHi;
-	histHi = std::min(levelHi,
-			  std::max(0.0, std::max(histHi, levelHi - config.hiMax)));
-	LOG(RPiContrast, Debug)
-		<< "Final values " << histHi << " -> " << levelHi;
-	enhance.append(histHi, levelHi);
-	enhance.append(65535, 65535);
-	return enhance;
-}
-
-Pwl applyManualContrast(Pwl const &gammaCurve, double brightness,
-			double contrast)
-{
-	Pwl newGammaCurve;
-	LOG(RPiContrast, Debug)
-		<< "Manual brightness " << brightness << " contrast " << contrast;
-	gammaCurve.map([&](double x, double y) {
-		newGammaCurve.append(
-			x, std::max(0.0, std::min(65535.0,
-						  (y - 32768) * contrast +
-							  32768 + brightness)));
-	});
-	return newGammaCurve;
-}
-
-void Contrast::process(StatisticsPtr &stats,
-		       [[maybe_unused]] Metadata *imageMetadata)
-{
-	Histogram &histogram = stats->yHist;
-	/*
-	 * 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 gammaCurve = config_.gammaCurve;
-	if (config_.ceEnable) {
-		if (config_.loMax != 0 || config_.hiMax != 0)
-			gammaCurve = computeStretchCurve(histogram, config_).compose(gammaCurve);
-		/*
-		 * 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)
-		gammaCurve = applyManualContrast(gammaCurve, brightness_, contrast_);
-	/*
-	 * And fill in the status for output. Use more points towards the bottom
-	 * of the curve.
-	 */
-	status_.brightness = brightness_;
-	status_.contrast = contrast_;
-	status_.gammaCurve = std::move(gammaCurve);
-}
-
-/* Register algorithm with the system. */
-static Algorithm *create(Controller *controller)
-{
-	return (Algorithm *)new Contrast(controller);
-}
-static RegisterAlgorithm reg(NAME, &create);