Author: akv
Date: 2012-09-04 23:55:49 +0200 (Tue, 04 Sep 2012)
New Revision: 4278
Modified:
trunk/librawstudio/rs-curve.c
trunk/librawstudio/rs-curve.h
Log:
Copied code from application.c to rs-curve.c to calculate the best values to
set endpoints of curve - attempt to make a auto levels. Might need some work...
Modified: trunk/librawstudio/rs-curve.c
===================================================================
--- trunk/librawstudio/rs-curve.c 2012-09-04 21:16:39 UTC (rev 4277)
+++ trunk/librawstudio/rs-curve.c 2012-09-04 21:55:49 UTC (rev 4278)
@@ -1074,6 +1074,46 @@
curve->bg_buffer = NULL;
}
+
+/* Added by Anders Kvist */
+void
+rs_curve_auto_adjust_ends(GtkWidget *widget) {
+
+ RSCurveWidget *curve = RS_CURVE_WIDGET(widget);
+
+ gint i = 0;
+ gdouble black_threshold = 0.003; // Percent underexposed pixels
+ gdouble white_threshold = 0.01; // Percent overexposed pixels
+ gdouble blackpoint;
+ gdouble whitepoint;
+ guint total = 0;
+
+ guint *hist;
+ hist = curve->histogram_data;
+
+ // calculate black point
+ while(i < 256) {
+ total += hist[i]+hist[i]+hist[i];
+ if ((total) > ((250*250)/100*black_threshold))
+ break;
+ i++;
+ }
+ blackpoint = (gdouble) i / (gdouble) 255;
+
+ // calculate white point
+ i = 255;
+ while(i) {
+ total += hist[i]+hist[i]+hist[i];
+ if ((total) > ((250*250)/100*white_threshold))
+ break;
+ i--;
+ }
+ whitepoint = (gdouble) i / (gdouble) 255;
+
+ rs_curve_widget_move_knot(RS_CURVE_WIDGET(widget),0,blackpoint,0.0);
+ rs_curve_widget_move_knot(RS_CURVE_WIDGET(widget),-1,whitepoint,1.0);
+}
+
#ifdef RS_CURVE_TEST
void
Modified: trunk/librawstudio/rs-curve.h
===================================================================
--- trunk/librawstudio/rs-curve.h 2012-09-04 21:16:39 UTC (rev 4277)
+++ trunk/librawstudio/rs-curve.h 2012-09-04 21:55:49 UTC (rev 4278)
@@ -152,6 +152,9 @@
extern void
rs_curve_set_histogram_data(RSCurveWidget *curve, const gint *input);
+extern void
+rs_curve_auto_adjust_ends(GtkWidget *widget);
+
#define RS_CURVE_TYPE_WIDGET (rs_curve_widget_get_type ())
#define RS_CURVE_WIDGET(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj),
RS_CURVE_TYPE_WIDGET, RSCurveWidget))
#define RS_CURVE_WIDGET_CLASS(obj) (G_TYPE_CHECK_CLASS_CAST ((obj),
RS_CURVE_WIDGET, RSCurveWidgetClass))
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