libcamera: Move internal headers to include/libcamera/internal/

The libcamera internal headers are located in src/libcamera/include/.
The directory is added to the compiler headers search path with a meson
include_directories() directive, and internal headers are included with
(e.g. for the internal semaphore.h header)

  #include "semaphore.h"

All was well, until libcxx decided to implement the C++20
synchronization library. The __threading_support header gained a

  #include <semaphore.h>

to include the pthread's semaphore support. As include_directories()
adds src/libcamera/include/ to the compiler search path with -I, the
internal semaphore.h is included instead of the pthread version.
Needless to say, the compiler isn't happy.

Three options have been considered to fix this issue:

- Use -iquote instead of -I. The -iquote option instructs gcc to only
  consider the header search path for headers included with the ""
  version. Meson unfortunately doesn't support this option.

- Rename the internal semaphore.h header. This was deemed to be the
  beginning of a long whack-a-mole game, where namespace clashes with
  system libraries would appear over time (possibly dependent on
  particular system configurations) and would need to be constantly
  fixed.

- Move the internal headers to another directory to create a unique
  namespace through path components. This causes lots of churn in all
  the existing source files through the all project.

The first option would be best, but isn't available to us due to missing
support in meson. Even if -iquote support was added, we would need to
fix the problem before a new version of meson containing the required
support would be released.

The third option is thus the only practical solution available. Bite the
bullet, and do it, moving headers to include/libcamera/internal/.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 88 insertions, 0 deletions

diff --git a/include/libcamera/internal/camera_sensor.h b/include/libcamera/internal/camera_sensor.h
new file mode 100644
index 00000000..d79bd9ce
--- /dev/null
+++ b/include/libcamera/internal/camera_sensor.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_sensor.h - A camera sensor
+ */
+#ifndef __LIBCAMERA_CAMERA_SENSOR_H__
+#define __LIBCAMERA_CAMERA_SENSOR_H__
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <libcamera/controls.h>
+#include <libcamera/geometry.h>
+
+#include "libcamera/internal/formats.h"
+#include "libcamera/internal/log.h"
+
+namespace libcamera {
+
+class MediaEntity;
+class V4L2Subdevice;
+
+struct V4L2SubdeviceFormat;
+
+struct CameraSensorInfo {
+	std::string model;
+
+	uint32_t bitsPerPixel;
+
+	Size activeAreaSize;
+	Rectangle analogCrop;
+	Size outputSize;
+
+	uint64_t pixelRate;
+	uint32_t lineLength;
+};
+
+class CameraSensor : protected Loggable
+{
+public:
+	explicit CameraSensor(const MediaEntity *entity);
+	~CameraSensor();
+
+	CameraSensor(const CameraSensor &) = delete;
+	CameraSensor &operator=(const CameraSensor &) = delete;
+
+	int init();
+
+	const std::string &model() const { return model_; }
+	const MediaEntity *entity() const { return entity_; }
+	const std::vector<unsigned int> &mbusCodes() const { return mbusCodes_; }
+	const std::vector<Size> &sizes() const { return sizes_; }
+	const Size &resolution() const { return resolution_; }
+
+	V4L2SubdeviceFormat getFormat(const std::vector<unsigned int> &mbusCodes,
+				      const Size &size) const;
+	int setFormat(V4L2SubdeviceFormat *format);
+
+	const ControlInfoMap &controls() const;
+	ControlList getControls(const std::vector<uint32_t> &ids);
+	int setControls(ControlList *ctrls);
+
+	const ControlList &properties() const { return properties_; }
+	int sensorInfo(CameraSensorInfo *info) const;
+
+protected:
+	std::string logPrefix() const;
+
+private:
+	const MediaEntity *entity_;
+	std::unique_ptr<V4L2Subdevice> subdev_;
+	unsigned int pad_;
+
+	std::string model_;
+
+	ImageFormats formats_;
+	Size resolution_;
+	std::vector<unsigned int> mbusCodes_;
+	std::vector<Size> sizes_;
+
+	ControlList properties_;
+};
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_CAMERA_SENSOR_H__ */