First pass at integrating pipeline with application

main.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "camera_config.h"
+#include "gtk/gtk.h"
+
+struct mp_main_state {
+    const struct mp_camera_config *camera;
+    MPCameraMode mode;
+
+    bool gain_is_manual;
+    int gain;
+    int gain_max;
+
+    bool exposure_is_manual;
+    int exposure;
+
+    bool has_auto_focus_continuous;
+    bool has_auto_focus_start;
+};
+
+void mp_main_update_state(const struct mp_main_state *state);
+
+void mp_main_set_preview(cairo_surface_t *image);
+void mp_main_capture_completed(const char *fname);
+
+int
+remap(int value, int input_min, int input_max, int output_min, int output_max);