private void DecodeProgressiveDataInterleaved(ref JpegReader reader, JpegScanHeader scanHeader, Span <JpegArithmeticDecodingComponent> components)
{
foreach (JpegArithmeticDecodingComponent component in components)
{
if (component.DcTable is null || component.DcStatistics is null)
{
ThrowInvalidDataException();
}
}
JpegBlockAllocator allocator = _allocator;
JpegBitReader bitReader = new JpegBitReader(reader.RemainingBytes);
int mcusPerColumn = _mcusPerColumn;
int mcusPerLine = _mcusPerLine;
for (int rowMcu = 0; rowMcu < mcusPerColumn; rowMcu++)
{
for (int colMcu = 0; colMcu < mcusPerLine; colMcu++)
{
foreach (JpegArithmeticDecodingComponent component in components)
{
int index = component.ComponentIndex;
int h = component.HorizontalSamplingFactor;
int v = component.VerticalSamplingFactor;
int offsetX = colMcu * h;
int offsetY = rowMcu * v;
for (int y = 0; y < v; y++)
{
int blockOffsetY = offsetY + y;
for (int x = 0; x < h; x++)
{
ref JpegBlock8x8 blockRef = ref allocator.GetBlockReference(index, offsetX + x, blockOffsetY);
ReadBlockProgressiveDC(ref bitReader, component, scanHeader, ref blockRef);
}
}
}
if (!HandleRestart(ref bitReader, ref reader, ref scanHeader, ref MemoryMarshal.GetReference(components), components.Length))
{
return;
}
}
}
private void DecodeProgressiveDataInterleaved(ref JpegReader reader, JpegScanHeader scanHeader, Span <JpegHuffmanDecodingComponent> components)
{
JpegBlockAllocator allocator = _allocator;
JpegBitReader bitReader = new JpegBitReader(reader.RemainingBytes);
int mcusPerColumn = _mcusPerColumn;
int mcusPerLine = _mcusPerLine;
for (int rowMcu = 0; rowMcu < mcusPerColumn; rowMcu++)
{
for (int colMcu = 0; colMcu < mcusPerLine; colMcu++)
{
foreach (JpegHuffmanDecodingComponent component in components)
{
int index = component.ComponentIndex;
int h = component.HorizontalSamplingFactor;
int v = component.VerticalSamplingFactor;
int offsetX = colMcu * h;
int offsetY = rowMcu * v;
for (int y = 0; y < v; y++)
{
int blockOffsetY = offsetY + y;
for (int x = 0; x < h; x++)
{
ref JpegBlock8x8 blockRef = ref allocator.GetBlockReference(index, offsetX + x, blockOffsetY);
ReadBlockProgressiveDC(ref bitReader, component, scanHeader, ref blockRef);
}
}
}
if (!HandleRestart(ref bitReader, ref reader))
{
return;
}
}
}
private void ReadBlock(ref JpegBitReader reader, JpegArithmeticDecodingComponent component, ref JpegBlock8x8 destinationBlock)
{
ref short destinationRef = ref Unsafe.As <JpegBlock8x8, short>(ref destinationBlock);
private static void ReadBlockBaseline(ref JpegBitReader reader, JpegHuffmanDecodingComponent component, ref JpegBlock8x8 destinationBlock)
{
ref short destinationRef = ref Unsafe.As <JpegBlock8x8, short>(ref destinationBlock);
protected static void DequantizeBlockAndUnZigZag(JpegQuantizationTable quantizationTable, ref JpegBlock8x8 input, ref JpegBlock8x8F output)
{
Debug.Assert(!quantizationTable.IsEmpty);
ref ushort elementRef = ref MemoryMarshal.GetReference(quantizationTable.Elements);
