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Minor scan decoder optimization

pull/549/head
James Jackson-South 8 years ago
parent
3ef94802ce
commit
a20f5f7236
1 changed files with 6 additions and 11 deletions
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  1. 17
      src/ImageSharp/Formats/Jpeg/PdfJsPort/Components/PdfJsScanDecoder.cs

17
src/ImageSharp/Formats/Jpeg/PdfJsPort/Components/PdfJsScanDecoder.cs
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@ -396,7 +396,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
int blockRow = mcu / component.WidthInBlocks;
int blockCol = mcu % component.WidthInBlocks;
int offset = component.GetBlockBufferOffset(blockRow, blockCol);
this.DecodeACFirst(component, ref blockDataRef, offset, ref acHuffmanTable, stream);
this.DecodeACFirst(ref blockDataRef, offset, ref acHuffmanTable, stream);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
@ -407,7 +407,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
int blockRow = (mcuRow * component.VerticalSamplingFactor) + row;
int blockCol = (mcuCol * component.HorizontalSamplingFactor) + col;
int offset = component.GetBlockBufferOffset(blockRow, blockCol);
this.DecodeACFirst(component, ref blockDataRef, offset, ref acHuffmanTable, stream);
this.DecodeACFirst(ref blockDataRef, offset, ref acHuffmanTable, stream);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
@ -416,7 +416,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
int blockRow = mcu / component.WidthInBlocks;
int blockCol = mcu % component.WidthInBlocks;
int offset = component.GetBlockBufferOffset(blockRow, blockCol);
this.DecodeACSuccessive(component, ref blockDataRef, offset, ref acHuffmanTable, stream);
this.DecodeACSuccessive(ref blockDataRef, offset, ref acHuffmanTable, stream);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
@ -427,7 +427,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
int blockRow = (mcuRow * component.VerticalSamplingFactor) + row;
int blockCol = (mcuCol * component.HorizontalSamplingFactor) + col;
int offset = component.GetBlockBufferOffset(blockRow, blockCol);
this.DecodeACSuccessive(component, ref blockDataRef, offset, ref acHuffmanTable, stream);
this.DecodeACSuccessive(ref blockDataRef, offset, ref acHuffmanTable, stream);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
@ -574,11 +574,6 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
k += r;
if (k > 63)
{
break;
}
byte z = this.dctZigZag[k];
short re = (short)this.ReceiveAndExtend(s, stream);
Unsafe.Add(ref blockDataRef, offset + z) = re;
@ -611,7 +606,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
Unsafe.Add(ref blockDataRef, offset) |= (short)(bit << this.successiveState);
}
private void DecodeACFirst(PdfJsFrameComponent component, ref short blockDataRef, int offset, ref PdfJsHuffmanTable acHuffmanTable, DoubleBufferedStreamReader stream)
private void DecodeACFirst(ref short blockDataRef, int offset, ref PdfJsHuffmanTable acHuffmanTable, DoubleBufferedStreamReader stream)
{
if (this.eobrun > 0)
{
@ -652,7 +647,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort.Components
}
}
private void DecodeACSuccessive(PdfJsFrameComponent component, ref short blockDataRef, int offset, ref PdfJsHuffmanTable acHuffmanTable, DoubleBufferedStreamReader stream)
private void DecodeACSuccessive(ref short blockDataRef, int offset, ref PdfJsHuffmanTable acHuffmanTable, DoubleBufferedStreamReader stream)
{
int k = this.specStart;
int e = this.specEnd;

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