Improve gain/exposure controls

data/camera.ui

@@ -50,7 +50,7 @@
                         <child>
                           <object class="GtkButton" id="iso-controls-button">
                             <property name="valign">start</property>
-                            <property name="icon-name">iso-man-symbolic</property>
+                            <property name="icon-name">iso-auto-symbolic</property>
                             <style>
                               <class name="flat"/>
                               <class name="control"/>

src/io_pipeline.c

@@ -232,6 +232,7 @@ start_focus()
 static void
 update_controls()
 {
+        bool state_changed = false;
         // Don't update controls while capturing
         if (state_io.captures_remaining > 0) {
                 return;
@@ -247,6 +248,7 @@ update_controls()
                                               V4L2_CID_AUTOGAIN,
                                               !state_io.gain.manual_req);
                 state_io.gain.manual = state_io.gain.manual_req;
+                state_changed = true;
         }
 
         if ((state_io.gain.manual ||
@@ -256,6 +258,7 @@ update_controls()
                                                state_io.gain.control,
                                                state_io.gain.value_req);
                 state_io.gain.value = state_io.gain.value_req;
+                state_changed = true;
         }
 
         if (state_io.exposure.manual != state_io.exposure.manual_req) {
@@ -265,6 +268,7 @@ update_controls()
                                                       V4L2_EXPOSURE_MANUAL :
                                                       V4L2_EXPOSURE_AUTO);
                 state_io.exposure.manual = state_io.exposure.manual_req;
+                state_changed = true;
         }
 
         if (state_io.exposure.manual &&
@@ -273,6 +277,12 @@ update_controls()
                                                state_io.exposure.control,
                                                state_io.exposure.value_req);
                 state_io.exposure.value = state_io.exposure.value_req;
+                state_changed = true;
+        }
+
+        if (state_changed) {
+                pipeline_changed = true;
+                update_process_pipeline();
         }
 }
 
@@ -491,6 +501,9 @@ init_controls()
         } else {
                 state_io.blue.control = 0;
         }
+
+        pipeline_changed = true;
+        update_process_pipeline();
 }
 
 /*

src/main.c

@@ -157,6 +157,16 @@ update_io_pipeline()
 static bool
 update_state(const mp_state_main *new_state)
 {
+        if (state.exposure.manual != new_state->exposure.manual) {
+                const char *icon_name = new_state->exposure.manual ? "shutter-man-symbolic" : "shutter-auto-symbolic";
+                gtk_button_set_icon_name(GTK_BUTTON(shutter_button), icon_name);
+        }
+
+        if (state.gain.manual != new_state->gain.manual) {
+                const char *icon_name = new_state->gain.manual ? "iso-man-symbolic" : "iso-auto-symbolic";
+                gtk_button_set_icon_name(GTK_BUTTON(iso_button), icon_name);
+        }
+
         state.gain.control = new_state->gain.control;
         state.gain.auto_control = new_state->gain.auto_control;
         state.gain.value = new_state->gain.value;
@@ -191,8 +201,6 @@ update_state(const mp_state_main *new_state)
         gtk_widget_set_visible(iso_button, state.gain.control != 0);
         gtk_widget_set_visible(shutter_button, state.exposure.control != 0);
 
-        update_io_pipeline();
-
         return false;
 }
 
@@ -885,7 +893,7 @@ static void
 open_shutter_controls(GtkWidget *button, gpointer user_data)
 {
         float value =
-                ((float)state.exposure.value / (float)state.exposure.max) * 360.0f;
+                (float)state.exposure.value * 360.0f / (float)state.camera->current_mode->height;
         open_controls(button,
                       "Shutter",
                       1.0,