Add multi-frame handling.

- Exif of all frames are displayed in the Editor's Exif tab (without
separator)
- isHDR and isPixelShift is added to the data files stored in cache
- In the Editor panel, the QuickInfo frame display the HDR and
PixelShift information, as well as the number of frame and bit-depth for
HDR image
- the number of frame is provided by dcraw. If not set, it is provided
by the Exif's main IFD count
- the PixelShift information (for Pentax as of now) is provided by
looking at the Exif informations
- the HDR information is provided by the Exif information of the first
frame for Pentax raw files, or by the bitspersample, sampleformat and
compression tags for other files

TODO: add icons to the thumbnails to tag HDR and PixelShift files.

rtengine/imageformat.h

@@ -0,0 +1,54 @@
+/*
+ *  This file is part of RawTherapee.
+ *
+ *  Copyright (c) 20017 Jean-Christophe Frisch <natureh.510@gmail.com>
+ *
+ *  RawTherapee is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  RawTherapee is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef _IMAGEFORMAT_
+#define _IMAGEFORMAT_
+
+namespace rtengine
+{
+
+//NB: Update the associated strings in languages files when updating the following enum
+//    Look for "SAMPLEFORMAT_"
+typedef enum IIO_Sample_Format {
+    IIOSF_UNKNOWN        = 0,       // Unknown or Unsupported file type; Has to remain 0
+    //IIOSF_SIGNED_INT         ,    // Not yet supported
+    IIOSF_UNSIGNED_CHAR  = 1 << 0,
+    IIOSF_UNSIGNED_SHORT = 1 << 1,
+    //IIOSF_HALF               ,    // OpenEXR & NVidia's Half Float, not yet supported
+    IIOSF_LOGLUV24       = 1 << 2,
+    IIOSF_LOGLUV32       = 1 << 3,
+    IIOSF_FLOAT          = 1 << 4
+} IIOSampleFormat;
+
+typedef enum IIO_Sample_Arrangement {
+    IIOSA_UNKNOWN,       // Unknown or Unsupported file type
+    IIOSA_CHUNKY,
+    IIOSA_PLANAR
+} IIOSampleArrangement;
+
+typedef enum SensorType {
+    ST_NONE,   // use this value if the image is already demosaiced (i.e. not a raw file)
+    ST_BAYER,
+    ST_FUJI_XTRANS,
+    ST_FOVEON,
+    //ST_FUJI_EXR
+} eSensorType;
+
+}
+
+#endif