LV2 options for UI theme

Inform plugins about host theme (fg, bg colors) and UI scale-factor.
The latter follows an implementation already present in Carla and DPF.
These extension use proposed official URLs.

diff --git a/libs/ardour/ardour/lv2_plugin.h b/libs/ardour/ardour/lv2_plugin.h
index 734a8d7e213b14b7746c069ce2b94db1f171e014..6c9fea54f58e0b90f4d01f175bbff747e2a10e26 100644 (file)
--- a/libs/ardour/ardour/lv2_plugin.h
+++ b/libs/ardour/ardour/lv2_plugin.h
@@ -175,6 +175,17 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
        Variant                    get_property_value (uint32_t) const;
        void                       announce_property_values();
 
+       /* LV2 Option Options */
+       static void set_global_ui_background_color (uint32_t c) {
+               _ui_background_color = c;
+       }
+       static void set_global_ui_foreground_color (uint32_t c) {
+               _ui_foreground_color = c;
+       }
+       static void set_global_ui_scale_factor (float s) {
+               _ui_scale_factor = s;
+       }
+
   private:
        struct Impl;
        Impl*         _impl;
@@ -298,7 +309,6 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
                if (chn > 15) return UINT32_MAX;
                return _bankpatch[chn];
        }
-
 #endif
 
        typedef struct {
@@ -320,7 +330,10 @@ class LIBARDOUR_API LV2Plugin : public ARDOUR::Plugin, public ARDOUR::Workee
 #endif
 
        // Options passed to plugin
-       int32_t _seq_size;
+       int32_t         _seq_size;
+       static uint32_t _ui_background_color;
+       static uint32_t _ui_foreground_color;
+       static float    _ui_scale_factor;
 
        mutable unsigned _state_version;
 

diff --git a/libs/ardour/lv2_plugin.cc b/libs/ardour/lv2_plugin.cc
index 140c5f5d1f05bf35fb3b51c40700315f85c9303a..48e3901ecc3a046adfb0bf2ae0ca514a37c507e3 100644 (file)
--- a/libs/ardour/lv2_plugin.cc
+++ b/libs/ardour/lv2_plugin.cc
@@ -128,7 +128,10 @@ using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 
-bool LV2Plugin::force_state_save = false;
+bool     LV2Plugin::force_state_save = false;
+uint32_t LV2Plugin::_ui_background_color = 0x000000ff; // RGBA
+uint32_t LV2Plugin::_ui_foreground_color = 0xffffffff; // RGBA
+float    LV2Plugin::_ui_scale_factor = 1.0;
 
 class LV2World : boost::noncopyable {
 public:
@@ -501,7 +504,9 @@ LV2Plugin::init(const void* c_plugin, samplecnt_t rate)
        _features[n_features++]  = &_bankpatch_feature;
 #endif
 
-       LV2_URID atom_Int = _uri_map.uri_to_id(LV2_ATOM__Int);
+       LV2_URID atom_Int   = _uri_map.uri_to_id(LV2_ATOM__Int);
+       LV2_URID atom_Float = _uri_map.uri_to_id(LV2_ATOM__Float);
+
        static const int32_t _min_block_length = 1;   // may happen during split-cycles
        static const int32_t _max_block_length = 8192; // max possible (with all engines and during export)
        static const int32_t rt_policy = PBD_SCHED_FIFO;
@@ -526,6 +531,12 @@ LV2Plugin::init(const void* c_plugin, samplecnt_t rate)
                  sizeof(int32_t), atom_Int, &rt_policy },
                { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://ardour.org/lv2/threads/#schedPriority"),
                  sizeof(int32_t), atom_Int, &rt_priority },
+               { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://lv2plug.in/ns/extensions/ui#backgroundColor"),
+                 sizeof(int32_t), atom_Int, &_ui_background_color },
+               { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://lv2plug.in/ns/extensions/ui#foregroundColor"),
+                 sizeof(int32_t), atom_Int, &_ui_foreground_color },
+               { LV2_OPTIONS_INSTANCE, 0, _uri_map.uri_to_id("http://lv2plug.in/ns/extensions/ui#scaleFactor"),
+                 sizeof(int32_t), atom_Float, &_ui_scale_factor },
                { LV2_OPTIONS_INSTANCE, 0, 0, 0, 0, NULL }
        };