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Reduced number of memory allocations

pull/1068/head
Sergio Pedri 6 years ago
parent
0e61f0ea85
commit
71cf6e84a7
1 changed files with 41 additions and 38 deletions
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  1. 79
      src/ImageSharp/Processing/Processors/Effects/OilPaintingProcessor{TPixel}.cs

79
src/ImageSharp/Processing/Processors/Effects/OilPaintingProcessor{TPixel}.cs
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@ -72,6 +72,15 @@ namespace SixLabors.ImageSharp.Processing.Processors.Effects
int length = vectorSpan.Length;
ref Vector4 vectorSpanRef = ref MemoryMarshal.GetReference(vectorSpan);
// Rent the shared buffer only once per parallel item
IMemoryOwner<float> bins = configuration.MemoryAllocator.Allocate<float>(levels * 4);
ref float binsRef = ref bins.GetReference();
ref int intensityBinRef = ref Unsafe.As<float, int>(ref binsRef);
ref float redBinRef = ref Unsafe.Add(ref binsRef, levels);
ref float blueBinRef = ref Unsafe.Add(ref redBinRef, levels);
ref float greenBinRef = ref Unsafe.Add(ref blueBinRef, levels);
for (int y = rows.Min; y < rows.Max; y++)
{
Span<TPixel> sourceRow = source.GetPixelRowSpan(y);
@ -83,56 +92,50 @@ namespace SixLabors.ImageSharp.Processing.Processors.Effects
int maxIntensity = 0;
int maxIndex = 0;
using (IMemoryOwner<float> bins = configuration.MemoryAllocator.Allocate<float>(levels * 4, AllocationOptions.Clean))
{
ref float binsRef = ref bins.GetReference();
ref int intensityBinRef = ref Unsafe.As<float, int>(ref binsRef);
ref float redBinRef = ref Unsafe.Add(ref binsRef, levels);
ref float blueBinRef = ref Unsafe.Add(ref redBinRef, levels);
ref float greenBinRef = ref Unsafe.Add(ref blueBinRef, levels);
// Clear the current shared buffer before processing each target pixel
bins.Memory.Span.Clear();
for (int fy = 0; fy <= radius; fy++)
{
int fyr = fy - radius;
int offsetY = y + fyr;
for (int fy = 0; fy <= radius; fy++)
{
int fyr = fy - radius;
int offsetY = y + fyr;
offsetY = offsetY.Clamp(0, maxY);
offsetY = offsetY.Clamp(0, maxY);
Span<TPixel> sourceOffsetRow = source.GetPixelRowSpan(offsetY);
Span<TPixel> sourceOffsetRow = source.GetPixelRowSpan(offsetY);
for (int fx = 0; fx <= radius; fx++)
{
int fxr = fx - radius;
int offsetX = x + fxr;
offsetX = offsetX.Clamp(0, maxX);
for (int fx = 0; fx <= radius; fx++)
{
int fxr = fx - radius;
int offsetX = x + fxr;
offsetX = offsetX.Clamp(0, maxX);
var vector = sourceOffsetRow[offsetX].ToVector4();
var vector = sourceOffsetRow[offsetX].ToVector4();
float sourceRed = vector.X;
float sourceBlue = vector.Z;
float sourceGreen = vector.Y;
float sourceRed = vector.X;
float sourceBlue = vector.Z;
float sourceGreen = vector.Y;
int currentIntensity = (int)MathF.Round((sourceBlue + sourceGreen + sourceRed) / 3F * (levels - 1));
int currentIntensity = (int)MathF.Round((sourceBlue + sourceGreen + sourceRed) / 3F * (levels - 1));
Unsafe.Add(ref intensityBinRef, currentIntensity)++;
Unsafe.Add(ref redBinRef, currentIntensity) += sourceRed;
Unsafe.Add(ref blueBinRef, currentIntensity) += sourceBlue;
Unsafe.Add(ref greenBinRef, currentIntensity) += sourceGreen;
Unsafe.Add(ref intensityBinRef, currentIntensity)++;
Unsafe.Add(ref redBinRef, currentIntensity) += sourceRed;
Unsafe.Add(ref blueBinRef, currentIntensity) += sourceBlue;
Unsafe.Add(ref greenBinRef, currentIntensity) += sourceGreen;
if (Unsafe.Add(ref intensityBinRef, currentIntensity) > maxIntensity)
{
maxIntensity = Unsafe.Add(ref intensityBinRef, currentIntensity);
maxIndex = currentIntensity;
}
if (Unsafe.Add(ref intensityBinRef, currentIntensity) > maxIntensity)
{
maxIntensity = Unsafe.Add(ref intensityBinRef, currentIntensity);
maxIndex = currentIntensity;
}
}
float red = MathF.Abs(Unsafe.Add(ref redBinRef, maxIndex) / maxIntensity);
float blue = MathF.Abs(Unsafe.Add(ref blueBinRef, maxIndex) / maxIntensity);
float green = MathF.Abs(Unsafe.Add(ref greenBinRef, maxIndex) / maxIntensity);
float alpha = sourceRow[x].ToVector4().W;
float red = MathF.Abs(Unsafe.Add(ref redBinRef, maxIndex) / maxIntensity);
float blue = MathF.Abs(Unsafe.Add(ref blueBinRef, maxIndex) / maxIntensity);
float green = MathF.Abs(Unsafe.Add(ref greenBinRef, maxIndex) / maxIntensity);
float alpha = sourceRow[x].ToVector4().W;
Unsafe.Add(ref vectorSpanRef, x) = new Vector4(red, green, blue, alpha);
}
Unsafe.Add(ref vectorSpanRef, x) = new Vector4(red, green, blue, alpha);
}
}

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