1 files changed, 112 insertions, 0 deletions
diff --git a/src/android/jpeg/exif.h b/src/android/jpeg/exif.h
new file mode 100644
index 00000000..446d53f3
--- /dev/null
+++ b/src/android/jpeg/exif.h
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2020, Google Inc.
+ *
+ * EXIF tag creator using libexif
+ */
+
+#pragma once
+
+#include <chrono>
+#include <string>
+#include <time.h>
+#include <vector>
+
+#include <libexif/exif-data.h>
+
+#include <libcamera/base/span.h>
+
+#include <libcamera/geometry.h>
+
+class Exif
+{
+public:
+	Exif();
+	~Exif();
+
+	enum Compression {
+		None = 1,
+		JPEG = 6,
+	};
+
+	enum Flash {
+		/* bit 0 */
+		Fired = 0x01,
+		/* bits 1 and 2 */
+		StrobeDetected = 0x04,
+		StrobeNotDetected = 0x06,
+		/* bits 3 and 4 */
+		ModeCompulsoryFiring = 0x08,
+		ModeCompulsorySuppression = 0x10,
+		ModeAuto = 0x18,
+		/* bit 5 */
+		FlashNotPresent = 0x20,
+		/* bit 6 */
+		RedEye = 0x40,
+	};
+
+	enum WhiteBalance {
+		Auto = 0,
+		Manual = 1,
+	};
+
+	enum StringEncoding {
+		NoEncoding = 0,
+		ASCII = 1,
+		Unicode = 2,
+	};
+
+	void setMake(const std::string &make);
+	void setModel(const std::string &model);
+
+	void setOrientation(int orientation);
+	void setSize(const libcamera::Size &size);
+	void setThumbnail(std::vector<unsigned char> &&thumbnail,
+			  Compression compression);
+	void setTimestamp(time_t timestamp, std::chrono::milliseconds msec);
+
+	void setGPSDateTimestamp(time_t timestamp);
+	void setGPSLocation(const double *coords);
+	void setGPSMethod(const std::string &method);
+
+	void setFocalLength(float length);
+	void setExposureTime(uint64_t nsec);
+	void setAperture(float size);
+	void setISO(uint16_t iso);
+	void setFlash(Flash flash);
+	void setWhiteBalance(WhiteBalance wb);
+
+	libcamera::Span<const uint8_t> data() const { return { exifData_, size_ }; }
+	[[nodiscard]] int generate();
+
+private:
+	ExifEntry *createEntry(ExifIfd ifd, ExifTag tag);
+	ExifEntry *createEntry(ExifIfd ifd, ExifTag tag, ExifFormat format,
+			       unsigned long components, unsigned int size);
+
+	void setByte(ExifIfd ifd, ExifTag tag, uint8_t item);
+	void setShort(ExifIfd ifd, ExifTag tag, uint16_t item);
+	void setLong(ExifIfd ifd, ExifTag tag, uint32_t item);
+	void setString(ExifIfd ifd, ExifTag tag, ExifFormat format,
+		       const std::string &item,
+		       StringEncoding encoding = NoEncoding);
+	void setRational(ExifIfd ifd, ExifTag tag, ExifRational item);
+	void setRational(ExifIfd ifd, ExifTag tag,
+			 libcamera::Span<const ExifRational> items);
+
+	std::tuple<int, int, int> degreesToDMS(double decimalDegrees);
+	void setGPSDMS(ExifIfd ifd, ExifTag tag, int deg, int min, int sec);
+
+	std::u16string utf8ToUtf16(const std::string &str);
+
+	bool valid_;
+
+	ExifData *data_;
+	ExifMem *mem_;
+	ExifByteOrder order_;
+
+	unsigned char *exifData_;
+	unsigned int size_;
+
+	std::vector<unsigned char> thumbnailData_;
+};