Tone curve histogram by crop area; see issue #648

rtengine/imagefloat.h

@@ -24,10 +24,9 @@
 
 #include <imageio.h>
 #include <rtengine.h>
-//#include <image16.h>
 
 namespace rtengine {
-
+    using namespace procparams;
 //enum TypeInterpolation { TI_Nearest, TI_Bilinear };
 
 class Image8;
@@ -90,6 +89,8 @@ class Imagefloat : public ImageIO, public IImagefloat {
         virtual float** getGPlane () { return g; }
         virtual float** getBPlane () { return b; }
 
+        void CalcCroppedHistogram(const ProcParams &params, float scale, LUTu & hist);
+
         void ExecCMSTransform(cmsHTRANSFORM hTransform, bool safe);
     };
 };