/// <summary>
/// Initializes a new instance of the <see cref="JpegBlockPostProcessor"/> struct.
/// </summary>
public JpegBlockPostProcessor(IRawJpegData decoder, IJpegComponent component)
{
int qtIndex = component.QuantizationTableIndex;
this.DequantiazationTable = ZigZag.CreateDequantizationTable(ref decoder.QuantizationTables[qtIndex]);
this.subSamplingDivisors = component.SubSamplingDivisors;
this.SourceBlock = default(Block8x8F);
this.WorkspaceBlock1 = default(Block8x8F);
this.WorkspaceBlock2 = default(Block8x8F);
}
/// <summary>
/// Initializes a new instance of the <see cref="JpegBlockPostProcessor"/> struct.
/// </summary>
/// <param name="decoder">The raw jpeg data.</param>
/// <param name="component">The raw component.</param>
public JpegBlockPostProcessor(IRawJpegData decoder, IJpegComponent component)
{
int qtIndex = component.QuantizationTableIndex;
this.DequantiazationTable = ZigZag.CreateDequantizationTable(ref decoder.QuantizationTables[qtIndex]);
this.subSamplingDivisors = component.SubSamplingDivisors;
this.maximumValue = (int)MathF.Pow(2, decoder.Precision) - 1;
this.SourceBlock = default;
this.WorkspaceBlock1 = default;
this.WorkspaceBlock2 = default;
}
public unsafe void ZigZag_CreateDequantizationTable_MultiplicationShouldQuantize(int seed)
{
Block8x8F original = CreateRandomFloatBlock(-500, 500, seed);
Block8x8F qt = CreateRandomFloatBlock(0, 10, seed + 42);
var unzig = ZigZag.CreateUnzigTable();
Block8x8F zigQt = ZigZag.CreateDequantizationTable(ref qt);
Block8x8F expected = original;
Block8x8F actual = original;
ReferenceImplementations.DequantizeBlock(&expected, &qt, unzig.Data);
actual.MultiplyInplace(ref zigQt);
this.CompareBlocks(expected, actual, 0);
}