Testing: Send UI scale to lv2 uis

Signed-off-by: falkTX <falktx@falktx.com>

source/backend/CarlaBackend.h

@@ -1192,47 +1192,52 @@ typedef enum {
      */
     ENGINE_OPTION_PREVENT_BAD_BEHAVIOUR = 19,
 
+    /*!
+     * Set UI scaling used in frontend, so backend can do the same for plugin UIs.
+     */
+    ENGINE_OPTION_FRONTEND_UI_SCALE = 20,
+
     /*!
      * Set frontend winId, used to define as parent window for plugin UIs.
      */
-    ENGINE_OPTION_FRONTEND_WIN_ID = 20,
+    ENGINE_OPTION_FRONTEND_WIN_ID = 21,
 
 #if !defined(BUILD_BRIDGE_ALTERNATIVE_ARCH) && !defined(CARLA_OS_WIN)
     /*!
      * Set path to wine executable.
      */
-    ENGINE_OPTION_WINE_EXECUTABLE = 21,
+    ENGINE_OPTION_WINE_EXECUTABLE = 22,
 
     /*!
      * Enable automatic wineprefix detection.
      */
-    ENGINE_OPTION_WINE_AUTO_PREFIX = 22,
+    ENGINE_OPTION_WINE_AUTO_PREFIX = 23,
 
     /*!
      * Fallback wineprefix to use if automatic detection fails or is disabled, and WINEPREFIX is not set.
      */
-    ENGINE_OPTION_WINE_FALLBACK_PREFIX = 23,
+    ENGINE_OPTION_WINE_FALLBACK_PREFIX = 24,
 
     /*!
      * Enable realtime priority for Wine application and server threads.
      */
-    ENGINE_OPTION_WINE_RT_PRIO_ENABLED = 24,
+    ENGINE_OPTION_WINE_RT_PRIO_ENABLED = 25,
 
     /*!
      * Base realtime priority for Wine threads.
      */
-    ENGINE_OPTION_WINE_BASE_RT_PRIO = 25,
+    ENGINE_OPTION_WINE_BASE_RT_PRIO = 26,
 
     /*!
      * Wine server realtime priority.
      */
-    ENGINE_OPTION_WINE_SERVER_RT_PRIO = 26,
+    ENGINE_OPTION_WINE_SERVER_RT_PRIO = 27,
 #endif
 
     /*!
      * Capture console output into debug callbacks.
      */
-    ENGINE_OPTION_DEBUG_CONSOLE_OUTPUT = 27
+    ENGINE_OPTION_DEBUG_CONSOLE_OUTPUT = 28
 
 } EngineOption;
 

source/backend/CarlaEngine.hpp

@@ -228,6 +228,7 @@ struct CARLA_API EngineOptions {
     bool preferPluginBridges;
     bool preferUiBridges;
     bool uisAlwaysOnTop;
+    float uiScale;
 
     uint maxParameters;
     uint uiBridgesTimeout;

source/backend/CarlaStandalone.cpp

@@ -286,6 +286,8 @@ static void carla_engine_init_common(CarlaEngine* const engine)
 
     engine->setOption(CB::ENGINE_OPTION_PREVENT_BAD_BEHAVIOUR,    gStandalone.engineOptions.preventBadBehaviour ? 1 : 0,  nullptr);
 
+    engine->setOption(CB::ENGINE_OPTION_FRONTEND_UI_SCALE, static_cast<int>(gStandalone.engineOptions.uiScale * 1000.0f), nullptr);
+
     if (gStandalone.engineOptions.frontendWinId != 0)
     {
         char strBuf[STR_MAX+1];
@@ -690,6 +692,11 @@ void carla_set_engine_option(EngineOption option, int value, const char* valueSt
         gStandalone.engineOptions.preventBadBehaviour = (value != 0);
         break;
 
+    case CB::ENGINE_OPTION_FRONTEND_UI_SCALE:
+        CARLA_SAFE_ASSERT_RETURN(value > 0,);
+        gStandalone.engineOptions.uiScale = static_cast<float>(value) / 1000;
+        break;
+
     case CB::ENGINE_OPTION_FRONTEND_WIN_ID: {
         CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
         const long long winId(std::strtoll(valueStr, nullptr, 16));

source/backend/engine/CarlaEngine.cpp

@@ -1790,6 +1790,11 @@ void CarlaEngine::setOption(const EngineOption option, const int value, const ch
 #endif
     }   break;
 
+    case ENGINE_OPTION_FRONTEND_UI_SCALE:
+        CARLA_SAFE_ASSERT_RETURN(value > 0,);
+        pData->options.uiScale = static_cast<float>(value) / 1000;
+        break;
+
     case ENGINE_OPTION_FRONTEND_WIN_ID: {
         CARLA_SAFE_ASSERT_RETURN(valueStr != nullptr && valueStr[0] != '\0',);
         const long long winId(std::strtoll(valueStr, nullptr, 16));

source/backend/engine/CarlaEngineData.cpp

@@ -191,6 +191,7 @@ EngineOptions::EngineOptions() noexcept
       preferUiBridges(true),
 #endif
       uisAlwaysOnTop(true),
+      uiScale(1.0f),
       maxParameters(MAX_DEFAULT_PARAMETERS),
       uiBridgesTimeout(4000),
       audioBufferSize(512),

source/backend/plugin/CarlaPluginLV2.cpp

@@ -137,6 +137,7 @@ enum CarlaLv2URIDs {
     kUridCarlaAtomWorkerIn,
     kUridCarlaAtomWorkerResp,
     kUridCarlaTransientWindowId,
+    kUridCarlaUiScale,
     kUridCount
 };
 
@@ -315,6 +316,7 @@ struct CarlaPluginLV2Options {
         SequenceSize,
         SampleRate,
         TransientWinId,
+        UiScale,
         WindowTitle,
         Null,
         Count
@@ -326,6 +328,7 @@ struct CarlaPluginLV2Options {
     int sequenceSize;
     float sampleRate;
     int64_t transientWinId;
+    float uiScale;
     const char* windowTitle;
     LV2_Options_Option opts[Count];
 
@@ -336,6 +339,7 @@ struct CarlaPluginLV2Options {
           sequenceSize(MAX_DEFAULT_BUFFER_SIZE),
           sampleRate(0.0),
           transientWinId(0),
+          uiScale(1.0f),
           windowTitle(nullptr)
     {
         LV2_Options_Option& optMaxBlockLenth(opts[MaxBlockLenth]);
@@ -370,6 +374,14 @@ struct CarlaPluginLV2Options {
         optSequenceSize.type    = kUridAtomInt;
         optSequenceSize.value   = &sequenceSize;
 
+        LV2_Options_Option& optUiScale(opts[UiScale]);
+        optUiScale.context = LV2_OPTIONS_INSTANCE;
+        optUiScale.subject = 0;
+        optUiScale.key     = kUridParamSampleRate;
+        optUiScale.size    = sizeof(float);
+        optUiScale.type    = kUridAtomFloat;
+        optUiScale.value   = &uiScale;
+
         LV2_Options_Option& optSampleRate(opts[SampleRate]);
         optSampleRate.context = LV2_OPTIONS_INSTANCE;
         optSampleRate.subject = 0;
@@ -6604,6 +6616,8 @@ private:
             return kUridCarlaAtomWorkerResp;
         if (std::strcmp(uri, LV2_KXSTUDIO_PROPERTIES__TransientWindowId) == 0)
             return kUridCarlaTransientWindowId;
+        if (std::strcmp(uri, "urn:carla:scale") == 0)
+            return kUridCarlaUiScale;
 
         // Custom plugin types
         return ((CarlaPluginLV2*)handle)->getCustomURID(uri);
@@ -6732,6 +6746,8 @@ private:
             return URI_CARLA_ATOM_WORKER_RESP;
         case kUridCarlaTransientWindowId:
             return LV2_KXSTUDIO_PROPERTIES__TransientWindowId;
+        case kUridCarlaUiScale:
+            return "urn:carla:scale";
         }
 
         // Custom plugin types

source/bridges-ui/CarlaBridgeFormatLV2.cpp

@@ -97,6 +97,7 @@ enum CarlaLv2URIDs {
     kUridCarlaAtomWorkerIn,
     kUridCarlaAtomWorkerResp,
     kUridCarlaTransientWindowId,
+    kUridCarlaUiScale,
     kUridCount
 };
 
@@ -130,6 +131,7 @@ struct Lv2PluginOptions {
     enum OptIndex {
         SampleRate,
         TransientWinId,
+        UiScale,
         WindowTitle,
         Null,
         Count
@@ -137,12 +139,14 @@ struct Lv2PluginOptions {
 
     float sampleRate;
     int64_t transientWinId;
+    float uiScale;
     const char* windowTitle;
     LV2_Options_Option opts[Count];
 
     Lv2PluginOptions() noexcept
         : sampleRate(static_cast<float>(gInitialSampleRate)),
           transientWinId(0),
+          uiScale(1.0f),
           windowTitle(kNullWindowTitle)
     {
         LV2_Options_Option& optSampleRate(opts[SampleRate]);
@@ -153,6 +157,14 @@ struct Lv2PluginOptions {
         optSampleRate.type    = kUridAtomFloat;
         optSampleRate.value   = &sampleRate;
 
+        LV2_Options_Option& optUiScale(opts[UiScale]);
+        optUiScale.context = LV2_OPTIONS_INSTANCE;
+        optUiScale.subject = 0;
+        optUiScale.key     = kUridParamSampleRate;
+        optUiScale.size    = sizeof(float);
+        optUiScale.type    = kUridCarlaUiScale;
+        optUiScale.value   = &uiScale;
+
         LV2_Options_Option& optTransientWinId(opts[TransientWinId]);
         optTransientWinId.context = LV2_OPTIONS_INSTANCE;
         optTransientWinId.subject = 0;

source/frontend/carla_backend.py

@@ -862,29 +862,32 @@ ENGINE_OPTION_PATH_RESOURCES = 18
 # @note: Linux only
 ENGINE_OPTION_PREVENT_BAD_BEHAVIOUR = 19
 
+# Set UI scaling used in frontend, so backend can do the same for plugin UIs.
+ENGINE_OPTION_FRONTEND_UI_SCALE = 20
+
 # Set frontend winId, used to define as parent window for plugin UIs.
-ENGINE_OPTION_FRONTEND_WIN_ID = 20
+ENGINE_OPTION_FRONTEND_WIN_ID = 21
 
 # Set path to wine executable.
-ENGINE_OPTION_WINE_EXECUTABLE = 21
+ENGINE_OPTION_WINE_EXECUTABLE = 22
 
 # Enable automatic wineprefix detection.
-ENGINE_OPTION_WINE_AUTO_PREFIX = 22
+ENGINE_OPTION_WINE_AUTO_PREFIX = 23
 
 # Fallback wineprefix to use if automatic detection fails or is disabled, and WINEPREFIX is not set.
-ENGINE_OPTION_WINE_FALLBACK_PREFIX = 23
+ENGINE_OPTION_WINE_FALLBACK_PREFIX = 24
 
 # Enable realtime priority for Wine application and server threads.
-ENGINE_OPTION_WINE_RT_PRIO_ENABLED = 24
+ENGINE_OPTION_WINE_RT_PRIO_ENABLED = 25
 
 # Base realtime priority for Wine threads.
-ENGINE_OPTION_WINE_BASE_RT_PRIO = 25
+ENGINE_OPTION_WINE_BASE_RT_PRIO = 26
 
 # Wine server realtime priority.
-ENGINE_OPTION_WINE_SERVER_RT_PRIO = 26
+ENGINE_OPTION_WINE_SERVER_RT_PRIO = 27
 
 # Capture console output into debug callbacks
-ENGINE_OPTION_DEBUG_CONSOLE_OUTPUT = 27
+ENGINE_OPTION_DEBUG_CONSOLE_OUTPUT = 28
 
 # ------------------------------------------------------------------------------------------------------------
 # Engine Process Mode

source/frontend/carla_host.py

@@ -2329,6 +2329,8 @@ class HostWindow(QMainWindow):
         self.refreshTransport(True)
         QMainWindow.showEvent(self, event)
 
+        self.host.set_engine_option(ENGINE_OPTION_FRONTEND_UI_SCALE, int(self.devicePixelRatioF() * 1000), "")
+
         # set our gui as parent for all plugins UIs
         if self.host.manageUIs and not (self.host.isControl or self.host.isPlugin):
             if MACOS:

source/utils/CarlaBackendUtils.hpp

@@ -337,6 +337,8 @@ const char* EngineOption2Str(const EngineOption option) noexcept
         return "ENGINE_OPTION_PATH_RESOURCES";
     case ENGINE_OPTION_PREVENT_BAD_BEHAVIOUR:
         return "ENGINE_OPTION_PREVENT_BAD_BEHAVIOUR";
+    case ENGINE_OPTION_FRONTEND_UI_SCALE:
+        return "ENGINE_OPTION_FRONTEND_UI_SCALE";
     case ENGINE_OPTION_FRONTEND_WIN_ID:
         return "ENGINE_OPTION_FRONTEND_WIN_ID";
 #if !defined(BUILD_BRIDGE_ALTERNATIVE_ARCH) && !defined(CARLA_OS_WIN)