Fixed compilation issue, added uint32 variant of max3

Author: kofa73

src/common/dttypes.h

@@ -27,7 +27,9 @@
 //#define NO_COLORMATRIX_NAN
 
 #include <float.h>
+#include <gmodule.h>
 #include <math.h>
+#include <stdint.h>
 
 // When included by a C++ file, restrict qualifiers are not allowed
 #ifdef __cplusplus
@@ -256,6 +258,11 @@ static inline int dt_is_valid_colormatrix(float matrix)
 
 #endif /* NO_COLORMATRIX_NAN */
 
+static inline uint32_t max3i(const uint32_t* array)
+{
+  return MAX(MAX(array[0], array[1]), array[2]);
+}
+
 static inline float max3f(const float* array)
 {
   return fmaxf(fmaxf(array[0], array[1]), array[2]);

src/iop/rgbcurve.c

@@ -891,7 +891,7 @@ static gboolean _area_draw_callback(GtkWidget *widget,
     float hist_max;
 
     if(autoscale == DT_S_SCALE_AUTOMATIC_RGB)
-      hist_max = max3f(self->histogram_max);
+      hist_max = max3i(self->histogram_max);
     else
       hist_max = self->histogram_max[ch];
 

src/iop/rgblevels.c

@@ -464,7 +464,7 @@ static gboolean _area_draw_callback(GtkWidget *widget,
     float hist_max;
 
     if(p->autoscale == DT_IOP_RGBLEVELS_LINKED_CHANNELS)
-      hist_max = max3f(self->histogram_max);
+      hist_max = max3i(self->histogram_max);
     else
       hist_max = self->histogram_max[ch];