Add IBMeterControl

A bitmap meter control, that can be used for VUMeters. Use with IPeakAvgSender<1>
iPlug2 · Sep 26, 2022 · 7ec7dcb · 7ec7dcb
1 parent 3b9d61e
commit 7ec7dcb
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diff --git a/IGraphics/Controls/IControls.cpp b/IGraphics/Controls/IControls.cpp
@@ -1573,3 +1573,38 @@ void IBTextControl::Draw(IGraphics& g)
 {
   g.DrawBitmapedText(mBitmap, mRECT, mText, &mBlend, mStr.Get(), mVCentre, mMultiLine, mCharWidth, mCharHeight, mCharOffset);
 }
+
+void IBMeterControl::OnMsgFromDelegate(int msgTag, int dataSize, const void* pData)
+{
+  if (!IsDisabled() && msgTag == ISender<>::kUpdateMessage)
+  {
+    IByteStream stream(pData, dataSize);
+
+    int pos = 0;
+    ISenderData<1, std::pair<float, float>> d;
+    pos = stream.Get(&d, pos);
+
+    if (mResponse == EResponse::Log)
+    {
+      auto lowPointAbs = std::fabs(mLowRangeDB);
+      auto rangeDB = std::fabs(mHighRangeDB - mLowRangeDB);
+      for (auto c = d.chanOffset; c < (d.chanOffset + d.nChans); c++)
+      {
+        auto [peak, avg] = d.vals[c];
+        auto ampValue = AmpToDB(avg);
+        auto linearPos = (ampValue + lowPointAbs)/rangeDB;
+        SetValue(Clip(linearPos, 0., 1.), c);
+      }
+    }
+    else
+    {
+      for (auto c = d.chanOffset; c < (d.chanOffset + d.nChans); c++)
+      {
+        auto [peak, avg] = d.vals[c];
+        SetValue(Clip(avg, 0.f, 1.f), c);
+      }
+    }
+
+    SetDirty(false);
+  }
+}
diff --git a/IGraphics/Controls/IControls.h b/IGraphics/Controls/IControls.h
@@ -662,6 +662,47 @@ class IBTextControl : public ITextControl
   bool mVCentre;
 };
 
+/** A bitmap meter control, that can be used for VUMeters. Use with IPeakAvgSender<1> */
+class IBMeterControl : public IBitmapControl
+{
+public:
+  enum class EResponse {
+    Linear,
+    Log,
+  };
+
+  /** Constructs a bitmap meter control
+   * @param x The x position of the top left point in the control's bounds (width will be determined by bitmap's dimensions)
+   * @param y The y position of the top left point in the control's bounds (height will be determined by bitmap's dimensions)
+   * @param bitmap The bitmap resource for the control */
+  IBMeterControl(float x, float y, const IBitmap& bitmap, EResponse response = EResponse::Linear, float lowRangeDB = -72.f, float highRangeDB = 12.f)
+  : IBitmapControl(x, y, bitmap)
+  , mResponse(response)
+  , mLowRangeDB(lowRangeDB)
+  , mHighRangeDB(highRangeDB)
+  {}
+
+  /** Constructs a bitmap meter control
+   * @param bounds The control's bounds
+   * @param bitmap The bitmap resource for the control */
+  IBMeterControl(const IRECT& bounds, const IBitmap& bitmap, EResponse response = EResponse::Linear, float lowRangeDB = -72.f, float highRangeDB = 12.f)
+  : IBitmapControl(bounds, bitmap)
+  , mResponse(response)
+  , mLowRangeDB(lowRangeDB)
+  , mHighRangeDB(highRangeDB)
+  {}
+
+  virtual ~IBMeterControl() {}
+  void Draw(IGraphics& g) override { DrawBitmap(g); }
+  void OnRescale() override { mBitmap = GetUI()->GetScaledBitmap(mBitmap); }
+  void OnMsgFromDelegate(int msgTag, int dataSize, const void* pData) override;
+
+protected:
+  float mHighRangeDB;
+  float mLowRangeDB;
+  EResponse mResponse = EResponse::Linear;
+};
+
 END_IGRAPHICS_NAMESPACE
 END_IPLUG_NAMESPACE