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Source/Components/Displays/SamplePainter.h

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+/*
+  ==============================================================================
+
+    SamplePainter.h
+    Created: 19 Sep 2023 3:02:14pm
+    Author:  binya
+
+  ==============================================================================
+*/
+
+#pragma once
+#include <JuceHeader.h>
+
+#include "../../Sampler/CustomSamplerVoice.h"
+#include "../../Utilities/ComponentUtils.h"
+
+/** A custom component that paints a waveform of a sample. A cache is used to help render large
+    waveforms with minimal overhead. Additionally, a method is provided to append to the path for real-time recording.
+*/
+class SamplePainter final : public CustomComponent, public ValueListener<int>
+{
+public:
+    explicit SamplePainter(ListenableAtomic<int>& primaryVisibleChannel, float resolutionScale = 0.25f, UIDummyParam* dummyParam = nullptr);
+    ~SamplePainter() override;
+
+    /** This adds (does not remove) to the path along the given start and end samples */
+    void appendToPath(int startSample, int endSample);
+
+    void setSample(const juce::AudioBuffer<float>& sampleBuffer);
+    void setSample(const juce::AudioBuffer<float>& sampleBuffer, int viewStartSample, int viewEndSample);
+    void setSampleView(int viewStartSample, int viewEndSample);
+
+    /** Change gain and repaint */
+    void setGain(float newGain);
+
+    /** Change mono display and repaint */
+    void setMono(bool isMono);
+
+private:
+    void paint(juce::Graphics& g) override;
+    void resized() override;
+    void enablementChanged() override;
+    void colourChanged() override;
+    juce::String getCustomHelpText() override;
+
+    /** Whether sample by sample display is active */
+    bool isSampleBySample() const;
+
+    /** Get the channel number of the sample at the given x and y coordinates (within a snap amount) */
+    int getChannel(int x, int y) const;
+
+    void mouseDown(const juce::MouseEvent& event) override;
+    void mouseUp(const juce::MouseEvent& event) override;
+
+    void valueChanged(ListenableValue<int>& source, int newValue) override;
+
+    /** Downsample a range of a buffer. If average is true, the values are averaged, otherwise the max value is taken (across a
+        a single channel if channel is set, or across all channels if channel is -1). 
+    */
+    void downsample(const juce::AudioBuffer<float>& buffer, bool average, int start, int numSamples, float& outMin, float& outMax);
+    void updateCaches(int start, int end);
+    void recalculateIntervals();
+
+    //==============================================================================
+    const juce::AudioBuffer<float>* sample{ nullptr };
+    int sampleSize{ 0 };
+
+    int viewStart{ 0 }, viewEnd{ 0 };
+    float gain{ 1.f };
+    bool mono{ false };
+
+    float resolutionScale{ 1.f };
+    float resolution{ 0.f };
+    int numPoints{ 0 };
+    float intervalWidth{ 0.f };
+
+    /** An intermediate buffer */
+    juce::AudioBuffer<float> sampleData;
+    juce::AudioBuffer<float> downsampleBuffer;
+
+    /** The cache is a down-sampled version of the sample that is used to speed up rendering */
+    juce::AudioBuffer<float> cache1Data, cache2Data;
+    juce::AudioBuffer<float> cache1DataMono, cache2DataMono;
+    static constexpr int cache1Amount{ 100 }, cache2Amount{ 5000 };
+
+    const int SAMPLE_BY_SAMPLE_THRESHOLD{ 150 };
+
+    /** Which channel has full opacity */
+    ListenableAtomic<int>& primaryChannel;
+    UIDummyParam* dummyParam{ nullptr };
+
+    /** Set when a mouse down has occurred on a channel */
+    int selectingChannel{ -1 };
+
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SamplePainter)
+};