优化Waveform渲染性能

Source/Arona/PeakFile/PeakFile.cpp

@@ -0,0 +1,66 @@
+#include "PeakFile.h"
+
+#include "PluginHost/Sampler.h"
+
+#define MID_TO_LOW (16 * 16)
+
+TArray<TArray<FSamplePeak>> GenPeakData(const TArray<TArray64<float>>& Data, int32 BlockSize)
+{
+	TArray<TArray<FSamplePeak>> Out;
+	Out.SetNum(Data.Num());
+	
+	for (int64 Channel = 0; Channel < Data.Num(); ++Channel)
+	{
+		const uint64 SourceNum = Data[Channel].Num();
+		uint64 BlockNum = SourceNum / BlockSize;
+		BlockNum += SourceNum % BlockSize ? 1 : 0;
+		
+		Out[Channel].SetNum(BlockNum);
+		uint64 Index = 0;
+		for (uint64 j = 0; j < BlockNum; j++)
+		{
+			float Max = FLT_MIN_EXP;
+			float Min = FLT_MAX;
+			
+			for (uint64 S = 0; S < BlockSize; ++S)
+			{
+				if (Index >= SourceNum) break;
+				const float& Sample = Data[Channel][Index];
+				if (Max < Sample) Max = Sample;
+				if (Min > Sample) Min = Sample;
+				++Index;
+			}
+			Out[Channel][j].Max = Max;
+			Out[Channel][j].Min = Min;
+		}
+	}
+	return Out;
+}
+
+void FWaveformRenderData::Generate(const TArray<TArray64<float>>& Data)
+{
+	Buffer = GenPeakData(Data, BlockSize);
+}
+
+FWaveform::FWaveform(int32 LevelNum, int32 MaxBlockSize)
+{
+	RenderData.SetNum(LevelNum);
+	int32 BeginBlock = MaxBlockSize;
+	for (int i = 0; i < LevelNum; ++i)
+	{
+		RenderData[i] = new FWaveformRenderData(BeginBlock);
+		BeginBlock /= 4;
+	}
+}
+
+FWaveform::~FWaveform()
+{
+	for (int i = 0; i < RenderData.Num(); ++i)
+		delete RenderData[i];
+}
+
+void FWaveform::UpdatePeak(const TArray<TArray64<float>>& SampleBuffer)
+{
+	for (int i = 0; i < RenderData.Num(); ++i)
+		RenderData[i]->Generate(SampleBuffer);
+}