コード例 #1
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 2 => this.DecodeUpFilter(scanline, previousScanline),
 3 => this.DecodeAverageFilter(scanline, previousScanline, bytesPerPixel),
コード例 #2
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 4 => this.DecodePaethFilter(scanline, previousScanline, bytesPerPixel),
コード例 #3
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 0 => scanline,     // Skip filterType byte
 1 => this.DecodeSubFilter(scanline, bytesPerPixel),
 2 => this.DecodeUpFilter(scanline, previousScanline),