public void Init()
{
this.WidthInBlocks = (int)MathF.Ceiling(
MathF.Ceiling(this.Frame.SamplesPerLine / 8F) * this.HorizontalSamplingFactor / this.Frame.MaxHorizontalFactor);
this.HeightInBlocks = (int)MathF.Ceiling(
MathF.Ceiling(this.Frame.Scanlines / 8F) * this.VerticalSamplingFactor / this.Frame.MaxVerticalFactor);
int blocksPerLineForMcu = this.Frame.McusPerLine * this.HorizontalSamplingFactor;
int blocksPerColumnForMcu = this.Frame.McusPerColumn * this.VerticalSamplingFactor;
this.SizeInBlocks = new Size(blocksPerLineForMcu, blocksPerColumnForMcu);
JpegComponent c0 = this.Frame.Components[0];
this.SubSamplingDivisors = c0.SamplingFactors.DivideBy(this.SamplingFactors);
if (this.SubSamplingDivisors.Width == 0 || this.SubSamplingDivisors.Height == 0)
{
JpegThrowHelper.ThrowBadSampling();
}
int totalNumberOfBlocks = blocksPerColumnForMcu * (blocksPerLineForMcu + 1);
int width = this.WidthInBlocks + 1;
int height = totalNumberOfBlocks / width;
var buf = MemoryGroup <Block8x8> .Allocate(width *height, height);
this.SpectralBlocks = new Buffer2D <Block8x8>(buf, width, height);
}
/// <summary>
/// Allocates the frame component blocks.
/// </summary>
public void InitComponents()
{
this.McusPerLine = (int)MathF.Ceiling(this.SamplesPerLine / 8F / this.MaxHorizontalFactor);
this.McusPerColumn = (int)MathF.Ceiling(this.Scanlines / 8F / this.MaxVerticalFactor);
for (int i = 0; i < this.ComponentCount; i++)
{
JpegComponent component = this.Components[i];
component.Init();
}
}
