Pipette and "On Preview Widgets" branch. See issue 227

The pipette part is already working quite nice but need to be finished. The widgets part needs more work...

rtengine/camconst.h

@@ -0,0 +1,61 @@
+/*
+ *  This file is part of RawTherapee.
+ */
+#ifndef __CAMCONST__
+#define __CAMCONST__
+
+#include <glibmm.h>
+#include <map>
+
+namespace rtengine {
+
+struct camera_const_levels {
+	int levels[4];
+};
+
+class CameraConst {
+  private:
+    Glib::ustring make_model;
+    short dcraw_matrix[12];
+    int raw_crop[4];
+    int raw_mask[8][4];
+    int white_max;
+    std::map<int, struct camera_const_levels> mLevels[2];
+    std::map<float, float> mApertureScaling;
+
+    CameraConst();
+    ~CameraConst();
+    static bool parseLevels(CameraConst *cc, int bw, void *ji);
+    static bool parseApertureScaling(CameraConst *cc, void *ji);
+    bool get_Levels(struct camera_const_levels & lvl, int bw, int iso, float fnumber);
+
+  public:
+    static CameraConst *parseEntry(void *cJSON, const char *make_model);
+    bool has_dcrawMatrix(void);
+    void update_dcrawMatrix(const short *other);
+    const short *get_dcrawMatrix(void);
+    bool has_rawCrop(void);
+    void get_rawCrop(int& left_margin, int& top_margin, int& width, int& height);
+    bool has_rawMask(int idx);
+    void get_rawMask(int idx, int& top, int& left, int& bottom, int& right);
+    int get_BlackLevel(int idx, int iso_speed);
+    int get_WhiteLevel(int idx, int iso_speed, float fnumber);
+    void update_Levels(const CameraConst *other);
+};
+
+class CameraConstantsStore {
+  private:
+    std::map<Glib::ustring, CameraConst *> mCameraConstants;
+
+    CameraConstantsStore();
+    bool parse_camera_constants_file(Glib::ustring filename);
+
+  public:
+    static void initCameraConstants(Glib::ustring baseDir, Glib::ustring userSettingsDir);
+    static CameraConstantsStore *getInstance(void);
+    CameraConst *get(const char make[], const char model[]);
+};
+
+}
+
+#endif