Implement Sony Pixel Shift for LibRaw

rtengine/dcraw.h

@@ -136,6 +136,15 @@ protected:
         ushort      *linebuf[_ltotal];
     };
 
+    /**
+     * Metadata for merged pixel-shift image.
+     */
+    struct MergedPixelshift
+    {
+        bool is_merged_pixelshift = false;
+        unsigned sub_frame_shot_select;
+    };
+
     int fuji_total_lines, fuji_total_blocks, fuji_block_width, fuji_bits, fuji_raw_type;
 
     ushort raw_height, raw_width, height, width, top_margin, left_margin;
@@ -162,6 +171,7 @@ protected:
     ThreeValBool RT_matrix_from_constant;
     std::string RT_software;
     double RT_baseline_exposure;
+    struct MergedPixelshift merged_pixelshift;
 
     struct PanasonicRW2Info {
         ushort bpp;