add ExposureProgram, LightSource and SubjectArea tags

TinyEXIF.cpp

@@ -148,6 +148,8 @@ public:
 	uint32_t GetData() const { return parse32(buf + offs + 8, alignIntel); }
 	uint32_t GetSubIFD() const { return tiff_header_start + GetData(); }
 
+	bool IsShort() const { return format == 3; }
+	bool IsLong() const { return format == 4; }
 	bool IsRational() const { return format == 5 || format == 10; }
 
 	bool Fetch(std::string& val) const {
@@ -163,13 +165,19 @@ public:
 		return true;
 	}
 	bool Fetch(uint16_t& val) const {
-		if (format != 3)
+		if (!IsShort())
 			return false;
 		val = parse16(buf + offs + 8, alignIntel);
 		return true;
 	}
+	bool Fetch(uint16_t& val, uint32_t idx) const {
+		if (!IsShort() || length <= idx)
+			return false;
+		val = parse16(buf + GetSubIFD() + idx*2, alignIntel);
+		return true;
+	}
 	bool Fetch(uint32_t& val) const {
-		if (format != 4)
+		if (!IsLong())
 			return false;
 		val = parse32(buf + offs + 8, alignIntel);
 		return true;
@@ -528,6 +536,11 @@ int EXIFInfo::parseFromEXIFSegment(const uint8_t* buf, unsigned len) {
 				parser.Fetch(FNumber);
 				break;
 
+			case 0x8822:
+				// Exposure Program
+				parser.Fetch(ExposureProgram);
+				break;
+
 			case 0x8827:
 				// ISO Speed Rating
 				parser.Fetch(ISOSpeedRatings);
@@ -568,8 +581,18 @@ int EXIFInfo::parseFromEXIFSegment(const uint8_t* buf, unsigned len) {
 				parser.Fetch(SubjectDistance);
 				break;
 
+			case 0x9207:
+				// Metering mode
+				parser.Fetch(MeteringMode);
+				break;
+
+			case 0x9208:
+				// Light source
+				parser.Fetch(LightSource);
+				break;
+
 			case 0x9209:
-				// Flash used
+				// Flash info
 				parser.Fetch(Flash);
 				break;
 
@@ -578,9 +601,13 @@ int EXIFInfo::parseFromEXIFSegment(const uint8_t* buf, unsigned len) {
 				parser.Fetch(FocalLength);
 				break;
 
-			case 0x9207:
+			case 0x9214:
-				// Metering mode
+				// Subject area
-				parser.Fetch(MeteringMode);
+				if (parser.IsShort() && parser.GetLength() > 1) {
+					SubjectArea.resize(parser.GetLength());
+					for (uint32_t i=0; i<parser.GetLength(); ++i)
+						parser.Fetch(SubjectArea[i], i);
+				}
 				break;
 
 			case 0x9291:
@@ -883,6 +910,7 @@ void EXIFInfo::clear() {
 	BitsPerSample     = 0;
 	ExposureTime      = 0;
 	FNumber           = 0;
+	ExposureProgram   = 0;
 	ISOSpeedRatings   = 0;
 	ShutterSpeedValue = 0;
 	ApertureValue     = 0;
@@ -892,7 +920,9 @@ void EXIFInfo::clear() {
 	FocalLength       = 0;
 	Flash             = 0;
 	MeteringMode      = 0;
+	LightSource       = 0;
 	ProjectionType    = 0;
+	SubjectArea.clear();
 
 	// LensInfo
 	LensInfo.FocalLengthMax = 0;

TinyEXIF.h

@@ -35,6 +35,7 @@
 #define __TINYEXIF_H__
 
 #include <string>
+#include <vector>
 
 #ifdef _MSC_VER
 #   ifdef TINYEXIF_EXPORT
@@ -124,6 +125,16 @@ public:
 	std::string Copyright;              // File copyright information
 	double ExposureTime;                // Exposure time in seconds
 	double FNumber;                     // F/stop
+	uint16_t ExposureProgram;           // Exposure program
+	                                    // 0: not defined
+	                                    // 1: manual
+	                                    // 2: normal program
+	                                    // 3: aperture priority
+	                                    // 4: shutter priority
+	                                    // 5: creative program
+	                                    // 6: action program
+	                                    // 7: portrait mode
+	                                    // 8: landscape mode
 	uint16_t ISOSpeedRatings;           // ISO speed
 	double ShutterSpeedValue;           // Shutter speed (reciprocal of exposure time)
 	double ApertureValue;               // The lens aperture
@@ -131,17 +142,61 @@ public:
 	double ExposureBiasValue;           // Exposure bias value in EV
 	double SubjectDistance;             // Distance to focus point in meters
 	double FocalLength;                 // Focal length of lens in millimeters
-	uint16_t Flash;                     // 0: no flash, >0: flash used
+	uint16_t Flash;                     // Flash info
+	                                    // Flash used (Flash&1)
+	                                    // 0: no flash, >0: flash used
+	                                    // Flash returned light status ((Flash & 6) >> 1)
+	                                    // 0: no strobe return detection function
+	                                    // 1: reserved
+	                                    // 2: strobe return light not detected
+	                                    // 3: strobe return light detected
+	                                    // Flash mode ((Flash & 24) >> 3)
+	                                    // 0: unknown
+	                                    // 1: compulsory flash firing
+	                                    // 2: compulsory flash suppression
+	                                    // 3: auto mode
+	                                    // Flash function ((Flash & 32) >> 5)
+	                                    // 0: flash function present, >0: no flash function
+	                                    // Flash red-eye ((Flash & 64) >> 6)
+	                                    // 0: no red-eye reduction mode or unknown, >0: red-eye reduction supported
 	uint16_t MeteringMode;              // Metering mode
+	                                    // 0: unknown
 	                                    // 1: average
 	                                    // 2: center weighted average
 	                                    // 3: spot
 	                                    // 4: multi-spot
-									    // 5: multi-segment
+	                                    // 5: pattern
+	                                    // 6: partial
+	uint16_t LightSource;               // Kind of light source
+	                                    // 0: unknown
+	                                    // 1: daylight
+	                                    // 2: fluorescent
+	                                    // 3: tungsten (incandescent light)
+	                                    // 4: flash
+	                                    // 9: fine weather
+	                                    // 10: cloudy weather
+	                                    // 11: shade
+	                                    // 12: daylight fluorescent (D 5700 - 7100K)
+	                                    // 13: day white fluorescent (N 4600 - 5400K)
+	                                    // 14: cool white fluorescent (W 3900 - 4500K)
+	                                    // 15: white fluorescent (WW 3200 - 3700K)
+	                                    // 17: standard light A
+	                                    // 18: standard light B
+	                                    // 19: standard light C
+										// 20: D55
+										// 21: D65
+										// 22: D75
+										// 23: D50
+	                                    // 24: ISO studio tungsten
 	uint16_t ProjectionType;            // Projection type
 									    // 0: unknown projection
 									    // 1: perspective projection
 									    // 2: equirectangular/spherical projection
+	std::vector<uint16_t> SubjectArea;  // Location and area of the main subject in the overall scene expressed in relation to the upper left as origin, prior to rotation
+	                                    // 0: unknown
+	                                    // 2: location of the main subject as coordinates (first value is the X coordinate and second is the Y coordinate)
+	                                    // 3: area of the main subject as a circle (first value is the center X coordinate, second is the center Y coordinate, and third is the diameter)
+	                                    // 4: area of the main subject as a rectangle (first value is the center X coordinate, second is the center Y coordinate, third is the width of the area, and fourth is the height of the area)
 	struct LensInfo_t {                 // Lens information
 		double FStopMin;                // Min aperture (f-stop)
 		double FStopMax;                // Max aperture (f-stop)