temp/libcamera: fork for temporary downstream patches (MR 5162)

which are probably too experimental to ask Alpine to carry them, while being
very helpful for devices that pmOS targets. The explicit goal is to help
Libcamera development and drop the fork again.

For the dma heaps permissions see the ongoing debate in
https://lore.kernel.org/all/bb372250-e8b8-4458-bc99-dd8365b06991@redhat.com/
It's possible that Libcamera will switch to another solution in a future
release or that memory accounting issues around dma heaps will need to
get fixed in the kernel before the permissions can be set by default by
distros.

Regarding `libcamera: simple:` patches:
 - 0001-0003 can likely be dropped once the Libcamera SoftISP gains
   support for raw (bayer) streams passthrough (on top of converting to
   RGB or YUV formats).
 - 0004 will likely be needed until Megi downstream patches for the
   Pinephone get improved/upstreamed and Libcamera adopted accordingly.

With these patches libcamera and pipewire based applications should work
on the Librem5, Pinephone and - hopefully soon - devices like the OP6.

See https://gitlab.com/postmarketOS/pmaports/-/merge_requests/5162 for
more context.
[ci:skip-build]: already built successfully in CI

temp/libcamera/0001-libcamera-simple-Enable-softwareISP-for-the-librem5.patch

@@ -0,0 +1,26 @@
+From 278114dc6f3db69bacd80327516bc397dd1b881f Mon Sep 17 00:00:00 2001
+From: Robert Mader <robert.mader@collabora.com>
+Date: Mon, 22 Apr 2024 23:30:31 +0200
+Subject: [PATCH 1/4] libcamera: simple: Enable softwareISP for the librem5
+
+And - in theory - on similar devices.
+---
+ src/libcamera/pipeline/simple/simple.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
+index db3575c3..ac792b35 100644
+--- a/src/libcamera/pipeline/simple/simple.cpp
++++ b/src/libcamera/pipeline/simple/simple.cpp
+@@ -198,7 +198,7 @@ namespace {
+ 
+ static const SimplePipelineInfo supportedDevices[] = {
+ 	{ "dcmipp", {}, false },
+-	{ "imx7-csi", { { "pxp", 1 } }, false },
++	{ "imx7-csi", { { "pxp", 1 } }, true },
+ 	{ "j721e-csi2rx", {}, false },
+ 	{ "mtk-seninf", { { "mtk-mdp", 3 } }, false },
+ 	{ "mxc-isi", {}, false },
+-- 
+2.45.1
+

temp/libcamera/0001-qcam-Decrease-minimum-width-of-selector-dialog.patch

@@ -0,0 +1,32 @@
+From 08c1dd69b556b0325fe6cdfea4b28b4f2df90658 Mon Sep 17 00:00:00 2001
+From: Luca Weiss <luca@z3ntu.xyz>
+Date: Sat, 28 Jan 2023 17:24:03 +0100
+Subject: [PATCH] qcam: Decrease minimum width of selector dialog
+
+On phone screens the default width is too wide, so the OK button cannot
+be clicked.
+
+Fix this by decreasing the minimum size of the dialog so it fits nicely.
+
+Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
+---
+ src/apps/qcam/cam_select_dialog.cpp | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/apps/qcam/cam_select_dialog.cpp b/src/apps/qcam/cam_select_dialog.cpp
+index 3c8b12a9..2a600383 100644
+--- a/src/apps/qcam/cam_select_dialog.cpp
++++ b/src/apps/qcam/cam_select_dialog.cpp
+@@ -25,6 +25,9 @@ CameraSelectorDialog::CameraSelectorDialog(libcamera::CameraManager *cameraManag
+ 	/* Use a QFormLayout for the dialog. */
+ 	QFormLayout *layout = new QFormLayout(this);
+ 
++	/* Decrease minimum width of dialog to fit on narrow screens */
++	setMinimumSize(250, 100);
++
+ 	/* Setup the camera id combo-box. */
+ 	cameraIdComboBox_ = new QComboBox;
+ 	for (const auto &cam : cm_->cameras())
+-- 
+2.39.1
+

temp/libcamera/0002-libcamera-simple-Force-disable-softwareISP-for-milli.patch

@@ -0,0 +1,43 @@
+From f430e03c6b155d0e841db33020d53cac566a420e Mon Sep 17 00:00:00 2001
+From: Robert Mader <robert.mader@collabora.com>
+Date: Thu, 9 May 2024 21:07:07 +0200
+Subject: [PATCH 2/4] libcamera: simple: Force-disable softwareISP for
+ millipixels
+
+As the later uses libcamera and requires raw-streams to get passed
+through. In the future, libcamera will likely support both - raw and
+swIsp - at the same time.
+---
+ src/libcamera/pipeline/simple/simple.cpp | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
+index ac792b35..0ccbfa90 100644
+--- a/src/libcamera/pipeline/simple/simple.cpp
++++ b/src/libcamera/pipeline/simple/simple.cpp
+@@ -7,6 +7,7 @@
+  */
+ 
+ #include <algorithm>
++#include <fstream>
+ #include <iterator>
+ #include <list>
+ #include <map>
+@@ -1546,6 +1547,14 @@ bool SimplePipelineHandler::match(DeviceEnumerator *enumerator)
+ 
+ 	swIspEnabled_ = info->swIspEnabled;
+ 
++	std::string comm_string;
++	std::ifstream("/proc/self/comm") >> comm_string;
++	if (comm_string == "millipixels") {
++		LOG(SimplePipeline, Warning)
++				<< "Detected millipixels, disabling swIsp";
++		swIspEnabled_ = false;
++	}
++
+ 	/* Locate the sensors. */
+ 	std::vector<MediaEntity *> sensors = locateSensors();
+ 	if (sensors.empty()) {
+-- 
+2.45.1
+

temp/libcamera/0003-libcamera-simple-Enable-softISP-for-the-Pinephone.patch

@@ -0,0 +1,32 @@
+From ac83a8feb2d7d9539456dd301c08f89f1cd08b7d Mon Sep 17 00:00:00 2001
+From: Robert Mader <robert.mader@collabora.com>
+Date: Wed, 1 May 2024 18:12:02 +0200
+Subject: [PATCH 3/4] libcamera: simple: Enable softISP for the Pinephone
+
+In theory the PP should be able to use the actual HW ISP, however in
+practice this does not work well yet - especially as the driver for the
+front camera in Megi differs heavily from the upstream one.
+
+Thus enable the swISP to make both cameras work reliably for now. This
+is essentially what Megapixels does as well. If the HW ISP situation
+improves, this can be dropped again.
+---
+ src/libcamera/pipeline/simple/simple.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
+index 0ccbfa90..71a44237 100644
+--- a/src/libcamera/pipeline/simple/simple.cpp
++++ b/src/libcamera/pipeline/simple/simple.cpp
+@@ -204,7 +204,7 @@ static const SimplePipelineInfo supportedDevices[] = {
+ 	{ "mtk-seninf", { { "mtk-mdp", 3 } }, false },
+ 	{ "mxc-isi", {}, false },
+ 	{ "qcom-camss", {}, true },
+-	{ "sun6i-csi", {}, false },
++	{ "sun6i-csi", {}, true },
+ };
+ 
+ } /* namespace */
+-- 
+2.45.1
+

temp/libcamera/0004-libcamera-simple-Skip-hwISP-formats-if-swISP-is-acti.patch

@@ -0,0 +1,32 @@
+From 0e10f1da5892156dc31445918303dc5eb80f9d0f Mon Sep 17 00:00:00 2001
+From: Robert Mader <robert.mader@collabora.com>
+Date: Mon, 6 May 2024 21:21:57 +0200
+Subject: [PATCH 4/4] libcamera: simple: Skip hwISP formats if swISP is active
+
+On devices like the Pinephone libcamera will advertise support for
+formats provided by the HW ISP and the SW ISP at the same time. The
+reason why we enable the SW ISP in the first place is, however, that the
+HW ISP does not work reliable atm. Thus filter out formats from the HW
+ISP when the SW ISP is enabled, to ensure we use the later.
+---
+ src/libcamera/pipeline/simple/simple.cpp | 4 +---
+ 1 file changed, 1 insertion(+), 3 deletions(-)
+
+diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
+index 71a44237..36604a83 100644
+--- a/src/libcamera/pipeline/simple/simple.cpp
++++ b/src/libcamera/pipeline/simple/simple.cpp
+@@ -652,9 +652,7 @@ void SimpleCameraData::tryPipeline(unsigned int code, const Size &size)
+ 			config.outputFormats = swIsp_->formats(pixelFormat);
+ 			config.outputSizes = swIsp_->sizes(pixelFormat, format.size);
+ 			if (config.outputFormats.empty()) {
+-				/* Do not use swIsp for unsupported pixelFormat's. */
+-				config.outputFormats = { pixelFormat };
+-				config.outputSizes = config.captureSize;
++				continue;
+ 			}
+ 		} else {
+ 			config.outputFormats = { pixelFormat };
+-- 
+2.45.1
+

temp/libcamera/90-libcamera.rules

@@ -0,0 +1 @@
+SUBSYSTEM=="dma_heap",GROUP="video",MODE="0660"

temp/libcamera/APKBUILD

@@ -0,0 +1,157 @@
+# Forked from Alpine for temporary downstream patches
+
+pkgname=libcamera
+pkgver=9999
+_pkgver=0.3.0
+pkgrel=0
+pkgdesc="Linux camera framework"
+url="https://libcamera.org/"
+arch="all"
+license="LGPL-2.1-or-later AND GPL-2.0-or-later"
+depends_dev="
+	eudev-dev
+	glib-dev
+	gnutls-dev
+	gst-plugins-bad-dev
+	qt5-qtbase-dev
+	"
+# upstream calls 'date' with a non-POSIX option so we pull in coreutils
+makedepends="$depends_dev
+	coreutils
+	doxygen
+	graphviz
+	gtest-dev
+	libevent-dev
+	libunwind-dev
+	linux-headers
+	meson
+	py3-jinja2
+	py3-ply
+	py3-sphinx
+	py3-yaml
+	qt5-qttools-dev
+	yaml-dev
+	"
+subpackages="
+	$pkgname-dbg
+	$pkgname-dev
+	$pkgname-doc
+	qcam
+	$pkgname-gstreamer
+	$pkgname-v4l2
+	$pkgname-tools
+	"
+source="https://gitlab.freedesktop.org/camera/libcamera/-/archive/v$_pkgver/libcamera-v$_pkgver.tar.gz
+	0001-qcam-Decrease-minimum-width-of-selector-dialog.patch
+	0001-libcamera-simple-Enable-softwareISP-for-the-librem5.patch
+	0002-libcamera-simple-Force-disable-softwareISP-for-milli.patch
+	0003-libcamera-simple-Enable-softISP-for-the-Pinephone.patch
+	0004-libcamera-simple-Skip-hwISP-formats-if-swISP-is-acti.patch
+	qcam.desktop
+	90-libcamera.rules
+	"
+builddir="$srcdir/$pkgname-v$_pkgver"
+# gstreamer tests fail
+# manual strip because ipa .sign files depend on the file contents- have to re-sign after strip
+options="!strip !check"
+
+case "$CARCH" in
+arm*|aarch64)
+	subpackages="$subpackages $pkgname-raspberrypi"
+	;;
+esac
+
+case "$CARCH" in
+ppc64le|s390x|riscv64|loongarch64)
+	# doesn't install any ipa
+	;;
+*)
+	depends="$pkgname-ipa=$pkgver-r$pkgrel"
+	subpackages="$subpackages $pkgname-ipa"
+	;;
+esac
+
+build() {
+	abuild-meson \
+		-Dv4l2=true \
+		-Dwerror=false \
+		. output
+	meson compile -C output
+}
+
+check() {
+	meson test --no-rebuild -C output --print-errorlogs
+}
+
+package() {
+	DESTDIR="$pkgdir" meson install --no-rebuild -C output
+	install -Dm644 -t "$pkgdir"/usr/share/applications "$srcdir"/qcam.desktop
+
+	# manual strip first..
+	scanelf --recursive \
+		--nobanner \
+		--etype "ET_DYN,ET_EXEC" \
+		--format "%F" \
+		"$pkgdir" \
+		| while read -r file; do
+			strip "$file"
+	done
+
+	install -Dm644 "$srcdir"/90-libcamera.rules \
+		-t "$pkgdir"/lib/udev/rules.d/
+}
+
+ipa() {
+	depends=""
+	amove usr/lib/libcamera
+	# then sign ipa's
+	local ipa
+	for ipa in "$subpkgdir"/usr/lib/libcamera/ipa*.so; do
+		msg "signing $ipa"
+		"$builddir"/src/ipa/ipa-sign.sh \
+			"$(find "$builddir"/output -type f -iname "*ipa-priv-key.pem")" \
+			"$ipa" \
+			"$ipa".sign
+	done
+}
+
+qcam() {
+	depends=""
+	amove usr/bin/qcam
+
+	amove usr/share/applications/qcam.desktop
+}
+
+gstreamer() {
+	depends=""
+	amove usr/lib/gstreamer-1.0
+}
+
+v4l2() {
+	depends=""
+	amove usr/libexec/libcamera/v4l2-compat.so
+}
+
+raspberrypi() {
+	depends=""
+	amove usr/share/libcamera/ipa/rpi
+	amove usr/libexec/libcamera/raspberrypi_ipa_proxy
+	amove usr/share/libcamera/pipeline/rpi/vc4
+}
+
+tools() {
+	depends=""
+	amove usr/bin/cam
+	amove usr/bin/lc-compliance
+}
+
+sha512sums="
+d232593b6cc7f2b772e8cd0b6751fee00ddbde256328c4cf7162726d4766149afca36411075e2b55a8a009d52758f01874ff08b947b508dbe5e3059fa4a92c86  libcamera-v0.3.0.tar.gz
+69d6e29d764f752feed453b9c0f61c81cdb506eb14893d0d99d0d6834f369f1e816c2381dfab5ad1a744a3d11211af02d75dc041ecc87c7e4f73e2bd34c666c2  0001-qcam-Decrease-minimum-width-of-selector-dialog.patch
+495bc434fe188d0b83c88325657946e57b0a31d34d5249d8ea02fbfb4025ff15080a5da6bf61866eeffa63dad9b2b9a7b8abb456a306da8925c39775eda339bb  0001-libcamera-simple-Enable-softwareISP-for-the-librem5.patch
+26b274c32c9fc0d8220f58c7e37f6c0c9e590b2ff07adbc908b4c38ae4b7104639bb8ecf57b2faa15d2fae932d0021b51ad6a31a8762a05d3f876d55f0fef242  0002-libcamera-simple-Force-disable-softwareISP-for-milli.patch
+68b66432d3e60adc7329713b1362d023244516b697fbcb67112d9aad1367d2c65a100470b1ab6747074ca2717ec18e848b3888b382f75be1646e182894c6a37c  0003-libcamera-simple-Enable-softISP-for-the-Pinephone.patch
+4bfc5c35cf6bc8f1695744486a43695efa7bef5ce1c3bc93bda227832d08394f3bb0115863f7a30a8adfc4c93af293cdd5063fdb78f8d850f4d0c2ac7b1ff123  0004-libcamera-simple-Skip-hwISP-formats-if-swISP-is-acti.patch
+22167a4eceb6d1b40b0b7c45fdf116c71684f5340de7f767535cb8e160ad9d2ae0f00cb3d461f73a344520a48a4641cf46226841d78bee06bfbfd2a91337f754  qcam.desktop
+444a0a52b374751c388f807b6adcc63b36488547adaa5fb70b606dc5646132b1a893a76254236b5c80f3a6d041a4597d413e050af0323cd05626d758190838e2  90-libcamera.rules
+"

temp/libcamera/qcam.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=QCam
+GenericName=Camera Demo App
+Comment=Take photos with camera exposed by libcamera
+Exec=qcam
+Type=Application
+Terminal=false
+StartupNotify=true