add basic, not terribly glossy MIDI region export

[ardour.git] / gtk2_ardour / volume_controller.cc

diff --git a/gtk2_ardour/volume_controller.cc b/gtk2_ardour/volume_controller.cc
index ca5b0abaa274bad494bdce9ebcc9b0cbaad191ce..c72a31036a1adac47cc7bc3414aa315e9865ec6b 100644 (file)
--- a/gtk2_ardour/volume_controller.cc
+++ b/gtk2_ardour/volume_controller.cc
@@ -130,7 +130,7 @@ VolumeController::to_display_value (double control_value)
        if (_linear) {
                v = (control_value - _controllable->lower ()) / (_controllable->upper() - _controllable->lower());
        } else {
-               v = gain_to_slider_position_with_max (control_value, ARDOUR::Config->get_max_gain());
+               v = gain_to_slider_position_with_max (control_value, _controllable->upper());
        }
 
        return v;
@@ -139,29 +139,92 @@ VolumeController::to_display_value (double control_value)
 double
 VolumeController::adjust (double control_delta)
 {
-       double v = _controllable->get_value ();
-       double abs_delta = fabs (control_delta);
-
-       /* convert to linear/fractional slider position domain */
-       v = gain_to_slider_position_with_max (v, ARDOUR::Config->get_max_gain());
-       /* adjust in this domain */
-       v += control_delta;
-       /* clamp in this domain */
-       v = std::max (0.0, std::min (1.0, v));
-       /* convert back to gain coefficient domain */
-       v = slider_position_to_gain_with_max (v, ARDOUR::Config->get_max_gain());
-       /* clamp in this domain */
-       v = std::max (_controllable->lower(), std::min (_controllable->upper(), v));
-
-       /* now round to some precision in the dB domain */
-       v = accurate_coefficient_to_dB (v);
-
-       if (abs_delta <= 0.01) {
-               v -= fmod (v, 0.05);
+       double v;
+
+       if (!_linear) {
+
+               /* we map back into the linear/fractional slider position,
+                * because this kind of control goes all the way down
+                * to -inf dB, and we want this occur in a reasonable way in
+                * terms of user interaction. if we leave the adjustment in the
+                * gain coefficient domain (or dB domain), the lower end of the
+                * control range (getting close to -inf dB) takes forever.
+                */
+
+               /* convert to linear/fractional slider position domain */
+               v = gain_to_slider_position_with_max (_controllable->get_value (), _controllable->upper());
+               /* increment in this domain */
+               v += control_delta;
+               /* clamp to appropriate range for linear/fractional slider domain */
+               v = std::max (0.0, std::min (1.0, v));
+               /* convert back to gain coefficient domain */
+               v = slider_position_to_gain_with_max (v, _controllable->upper());
+               /* clamp in controller domain */
+               v = std::max (_controllable->lower(), std::min (_controllable->upper(), v));
+               /* convert to dB domain */
+               v = accurate_coefficient_to_dB (v);
+               /* round up/down to nearest 0.1dB */
+               if (control_delta > 0.0) {
+                       v = ceil (v * 10.0) / 10.0;
+               } else {
+                       v = floor (v * 10.0) / 10.0;
+               }
+               /* and return it */
+               return dB_to_coefficient (v);
        } else {
-               v -= fmod (v, 0.1);
-       } 
+               double mult;
+
+               if (control_delta < 0.0) {
+                       mult = -1.0;
+               } else {
+                       mult = 1.0;
+               }
+
+               if (fabs (control_delta) < 0.05) {
+                       control_delta = mult * 0.05;
+               } else  {
+                       control_delta = mult * 0.1;
+               }
+
+               v = _controllable->get_value();
+
+               if (v == 0.0) {
+                       /* if we don't special case this, we can't escape from
+                          the -infinity dB black hole.
+                       */
+                       if (control_delta > 0.0) {
+                               v = dB_to_coefficient (-100 + control_delta);
+                       }
+               } else {
+                       static const double dB_minus_200 = dB_to_coefficient (-200.0);
+                       static const double dB_minus_100 = dB_to_coefficient (-100.0);
+                       static const double dB_minus_50 = dB_to_coefficient (-50.0);
+                       static const double dB_minus_20 = dB_to_coefficient (-20.0);
+
+                       if (control_delta < 0 && v < dB_minus_200) {
+                               v = 0.0;
+                       } else {
+
+                               /* non-linear scaling as the dB level gets low 
+                                  so that we can hit -inf and get back out of
+                                  it appropriately.
+                               */
+
+                               if (v < dB_minus_100) {
+                                       control_delta *= 1000.0;
+                               } else if (v < dB_minus_50) {
+                                       control_delta *= 100.0;
+                               } else if (v < dB_minus_20) {
+                                       control_delta *= 10.0;
+                               }
+
+                               v = accurate_coefficient_to_dB (v);
+                               v += control_delta;
+                               v = dB_to_coefficient (v);
+                       }
+               }
+
+               return std::max (_controllable->lower(), std::min (_controllable->upper(), v));
+       }
 
-       /* and return it */
-       return dB_to_coefficient (v);
 }