优化Waveform渲染性能

Source/Arona/UI/Widget/Pattern/SSamplePatternInstance.cpp

@@ -0,0 +1,51 @@
+#include "SSamplePatternInstance.h"
+
+#include "Pattern/SamplePatternInstance.h"
+#include "UI/Widget/Thumbnail.h"
+#include "UI/Widget/WaveformViewer.h"
+
+FSamplePatternInstanceWaveformHandle::FSamplePatternInstanceWaveformHandle(SSamplePatternInstance* InPatternInstance):
+	PatternInstanceWidget(InPatternInstance)
+{
+}
+
+TArrayView<const FSamplePeak> FSamplePatternInstanceWaveformHandle::GetWaveform(int32 SizeX)
+{
+	FSamplePatternInstance* Instance = (FSamplePatternInstance*)PatternInstanceWidget->GetPatternInstance();
+	TRange<AudioFrame> FrameViewRange = PatternInstanceWidget->GetFrameViewRange();
+	const FSampler* Sampler = Instance->GetInstanceOwner()->GetSampler();
+	const TRange<AudioFrame>& TimeRange = Instance->TimeRange;
+	
+	if (!RenderData)
+	{
+		RenderData = new FWaveform(7, 256 * 128);
+		RenderData->UpdatePeak(Sampler->GetSampleBuffer());
+		const float MemSize = RenderData->GetMemSize();
+		UE_LOG(LogTemp, Warning, TEXT("Waveform MemSize: %f MB"), MemSize / 1024 / 1024);
+	}
+	const AudioFrame InstancePos = Instance->GetMidiPos();
+	FrameViewRange = TRange<AudioFrame>(FrameViewRange.GetLowerBoundValue() - InstancePos, FrameViewRange.GetUpperBoundValue() - InstancePos);
+	const AudioFrame BeginFrame = FMath::Max(TimeRange.GetLowerBoundValue(), FrameViewRange.GetLowerBoundValue());
+	const AudioFrame EndFrame = FMath::Min(TimeRange.GetUpperBoundValue(), FrameViewRange.GetUpperBoundValue());
+	return RenderData->GetPeakFromRange(0, SizeX, BeginFrame, EndFrame);
+}
+
+SSamplePatternInstance::SSamplePatternInstance()
+{
+	WaveformHandle = MakeShared<FSamplePatternInstanceWaveformHandle>(this);
+}
+
+TSharedRef<SWidget> SSamplePatternInstance::GetViewWidget()
+{
+	return SAssignNew(WaveformViewer, SWaveformViewer)
+	.WaveformHandle(WaveformHandle);
+}
+
+void SSamplePatternInstance::RequestUpdate()
+{
+}
+
+FReply SSamplePatternInstance::OpenPatternMenu()
+{
+	return FReply::Handled();
+}