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using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using BCnEncoder.Shared;
namespace BCnEncoder.Decoder
{
internal interface IBcBlockDecoder<TRawBlock> where TRawBlock : unmanaged
{
TRawBlock[] Decode(ReadOnlyMemory<byte> data, OperationContext context);
TRawBlock DecodeBlock(ReadOnlySpan<byte> data);
}
internal interface IBcLdrBlockDecoder : IBcBlockDecoder<RawBlock4X4Rgba32>, IBcLdrDecoder {}
internal interface IBcHdrBlockDecoder : IBcBlockDecoder<RawBlock4X4RgbFloat>, IBcHdrDecoder {}
internal abstract class BaseLdrBlockDecoder<TEncodedBlock> : BaseBcBlockDecoder<TEncodedBlock, RawBlock4X4Rgba32>, IBcLdrBlockDecoder
where TEncodedBlock : unmanaged
{
/// <inheritdoc />
public byte[] Decode(ReadOnlyMemory<byte> data, int width, int height, OperationContext context)
{
var blocks = Decode(data, context);
return ImageToBlocks.ColorsFromRawBlocks(blocks, width, height).CopyAsBytes();
}
/// <inheritdoc />
public ColorRgba32[] DecodeColor(ReadOnlyMemory<byte> data, int width, int height, OperationContext context)
{
var blocks = Decode(data, context);
return ImageToBlocks.ColorsFromRawBlocks(blocks, width, height);
}
}
internal abstract class BaseHdrBlockDecoder<TEncodedBlock> : BaseBcBlockDecoder<TEncodedBlock, RawBlock4X4RgbFloat>, IBcHdrBlockDecoder
where TEncodedBlock : unmanaged
{
/// <inheritdoc />
public byte[] Decode(ReadOnlyMemory<byte> data, int width, int height, OperationContext context)
{
var blocks = Decode(data, context);
return ImageToBlocks.ColorsFromRawBlocks(blocks, width, height).ConvertTo<ColorRgbFloat, ColorRgbaFloat>().CopyAsBytes();
}
/// <inheritdoc />
public ColorRgbaFloat[] DecodeColor(ReadOnlyMemory<byte> data, int width, int height, OperationContext context)
{
var blocks = Decode(data, context);
return ImageToBlocks.ColorsFromRawBlocks(blocks, width, height).ConvertTo<ColorRgbFloat, ColorRgbaFloat>();
}
}
internal abstract class BaseBcBlockDecoder<TEncodedBlock, TRawBlock> : IBcBlockDecoder<TRawBlock>
where TEncodedBlock : unmanaged
where TRawBlock : unmanaged
{
private static readonly object lockObj = new object();
public TRawBlock[] Decode(ReadOnlyMemory<byte> data, OperationContext context)
{
if (data.Length % Unsafe.SizeOf<TEncodedBlock>() != 0)
{
throw new InvalidDataException("Given data does not align with the block length.");
}
var blockCount = data.Length / Unsafe.SizeOf<TEncodedBlock>();
var output = new TRawBlock[blockCount];
if (context.IsParallel)
{
var options = new ParallelOptions
{
CancellationToken = context.CancellationToken,
MaxDegreeOfParallelism = context.TaskCount
};
Parallel.For(0, blockCount, options, i =>
{
var encodedBlocks = MemoryMarshal.Cast<byte, TEncodedBlock>(data.Span);
output[i] = DecodeBlock(encodedBlocks[i]);
if (context.Progress != null)
{
lock (lockObj)
{
context.Progress.Report(1);
}
}
});
}
else
{
var encodedBlocks = MemoryMarshal.Cast<byte, TEncodedBlock>(data.Span);
for (var i = 0; i < blockCount; i++)
{
context.CancellationToken.ThrowIfCancellationRequested();
output[i] = DecodeBlock(encodedBlocks[i]);
context.Progress?.Report(1);
}
}
return output;
}
public TRawBlock DecodeBlock(ReadOnlySpan<byte> data)
{
var encodedBlock = MemoryMarshal.Cast<byte, TEncodedBlock>(data)[0];
return DecodeBlock(encodedBlock);
}
protected abstract TRawBlock DecodeBlock(TEncodedBlock block);
}
internal class Bc1NoAlphaDecoder : BaseLdrBlockDecoder<Bc1Block>
{
protected override RawBlock4X4Rgba32 DecodeBlock(Bc1Block block)
{
return block.Decode(false);
}
}
internal class Bc1ADecoder : BaseLdrBlockDecoder<Bc1Block>
{
protected override RawBlock4X4Rgba32 DecodeBlock(Bc1Block block)
{
return block.Decode(true);
}
}
internal class Bc2Decoder : BaseLdrBlockDecoder<Bc2Block>
{
protected override RawBlock4X4Rgba32 DecodeBlock(Bc2Block block)
{
return block.Decode();
}
}
internal class Bc3Decoder : BaseLdrBlockDecoder<Bc3Block>
{
protected override RawBlock4X4Rgba32 DecodeBlock(Bc3Block block)
{
return block.Decode();
}
}
internal class Bc4Decoder : BaseLdrBlockDecoder<Bc4Block>
{
private readonly ColorComponent component;
public Bc4Decoder(ColorComponent component)
{
this.component = component;
}
protected override RawBlock4X4Rgba32 DecodeBlock(Bc4Block block)
{
return block.Decode(component);
}
}
internal class Bc5Decoder : BaseLdrBlockDecoder<Bc5Block>
{
private readonly ColorComponent component1;
private readonly ColorComponent component2;
public Bc5Decoder(ColorComponent component1, ColorComponent component2)
{
this.component1 = component1;
this.component2 = component2;
}
protected override RawBlock4X4Rgba32 DecodeBlock(Bc5Block block)
{
return block.Decode(component1, component2);
}
}
internal class Bc6UDecoder : BaseHdrBlockDecoder<Bc6Block>
{
protected override RawBlock4X4RgbFloat DecodeBlock(Bc6Block block)
{
return block.Decode(false);
}
}
internal class Bc6SDecoder : BaseHdrBlockDecoder<Bc6Block>
{
protected override RawBlock4X4RgbFloat DecodeBlock(Bc6Block block)
{
return block.Decode(true);
}
}
internal class Bc7Decoder : BaseLdrBlockDecoder<Bc7Block>
{
protected override RawBlock4X4Rgba32 DecodeBlock(Bc7Block block)
{
return block.Decode();
}
}
internal class AtcDecoder : BaseLdrBlockDecoder<AtcBlock>
{
protected override RawBlock4X4Rgba32 DecodeBlock(AtcBlock block)
{
return block.Decode();
}
}
internal class AtcExplicitAlphaDecoder : BaseLdrBlockDecoder<AtcExplicitAlphaBlock>
{
protected override RawBlock4X4Rgba32 DecodeBlock(AtcExplicitAlphaBlock block)
{
return block.Decode();
}
}
internal class AtcInterpolatedAlphaDecoder : BaseLdrBlockDecoder<AtcInterpolatedAlphaBlock>
{
protected override RawBlock4X4Rgba32 DecodeBlock(AtcInterpolatedAlphaBlock block)
{
return block.Decode();
}
}
}