Added method MidiMessage::isMidiNoteBlack()

modules/juce_audio_basics/midi/juce_MidiMessage.cpp

@@ -941,6 +941,11 @@ double MidiMessage::getMidiNoteInHertz (int noteNumber, const double frequencyOf
     return frequencyOfA * pow (2.0, (noteNumber - 69) / 12.0);
 }
 
+bool MidiMessage::isMidiNoteBlack (int noteNumber) noexcept
+{
+    return ((1 << (noteNumber % 12)) & 0x054a) != 0;
+}
+
 const char* MidiMessage::getGMInstrumentName (const int n)
 {
     static const char* names[] =

modules/juce_audio_basics/midi/juce_MidiMessage.h

@@ -889,6 +889,9 @@ public:
     */
     static double getMidiNoteInHertz (int noteNumber, const double frequencyOfA = 440.0) noexcept;
 
+    /** Returns true if the given midi note number is a black key. */
+    static bool isMidiNoteBlack (int noteNumber) noexcept;
+
     /** Returns the standard name of a GM instrument, or nullptr if unknown for this index.
 
         @param midiInstrumentNumber     the program number 0 to 127

modules/juce_audio_utils/gui/juce_MidiKeyboardComponent.cpp

@@ -211,19 +211,11 @@ void MidiKeyboardComponent::getKeyPosition (int midiNoteNumber, const float keyW
                                      5.0f, 6 - blackNoteWidth * 0.3f,
                                      6.0f };
 
-    static const float widths[] = { 1.0f, blackNoteWidth,
-                                    1.0f, blackNoteWidth,
-                                    1.0f,
-                                    1.0f, blackNoteWidth,
-                                    1.0f, blackNoteWidth,
-                                    1.0f, blackNoteWidth,
-                                    1.0f };
-
     const int octave = midiNoteNumber / 12;
     const int note   = midiNoteNumber % 12;
 
     x = roundToInt (octave * 7.0f * keyWidth_ + notePos [note] * keyWidth_);
-    w = roundToInt (widths [note] * keyWidth_);
+    w = roundToInt (MidiMessage::isMidiNoteBlack (note) ? blackNoteWidth * keyWidth_ : keyWidth_);
 }
 
 void MidiKeyboardComponent::getKeyPos (int midiNoteNumber, int& x, int& w) const