/// <summary>
/// Creates a row from raw samples data.
/// </summary>
/// <param name="row">Raw description of samples.<br/>
/// You can pass collection with more than sampleCount samples - only sampleCount samples
/// will be parsed and all remaining bytes will be ignored.</param>
/// <param name="sampleCount">The number of samples in row.</param>
/// <param name="bitsPerComponent">The number of bits per component.</param>
/// <param name="componentsPerSample">The number of components per sample.</param>
public SampleRow(byte[] row, int sampleCount, byte bitsPerComponent, byte componentsPerSample)
{
if (row == null)
throw new ArgumentNullException("row");
if (row.Length == 0)
throw new ArgumentException("row is empty");
if (sampleCount <= 0)
throw new ArgumentOutOfRangeException("sampleCount");
if (bitsPerComponent <= 0 || bitsPerComponent > 16)
throw new ArgumentOutOfRangeException("bitsPerComponent");
if (componentsPerSample <= 0 || componentsPerSample > 5)
throw new ArgumentOutOfRangeException("componentsPerSample");
m_bytes = row;
using (BitStream bitStream = new BitStream(row))
{
m_samples = new Sample[sampleCount];
for (int i = 0; i < sampleCount; ++i)
m_samples[i] = new Sample(bitStream, bitsPerComponent, componentsPerSample);
}
}
/// <summary>
/// Creates row from an array of components.
/// </summary>
/// <param name="sampleComponents">Array of color components.</param>
/// <param name="bitsPerComponent">The number of bits per component.</param>
/// <param name="componentsPerSample">The number of components per sample.</param>
/// <remarks>The difference between this constructor and
/// <see cref="M:BitMiracle.LibJpeg.SampleRow.#ctor(System.Byte[],System.Int32,System.Byte,System.Byte)">another one</see> -
/// this constructor accept an array of prepared color components whereas
/// another constructor accept raw bytes and parse them.
/// </remarks>
internal SampleRow(short[] sampleComponents, byte bitsPerComponent, byte componentsPerSample)
{
if (sampleComponents == null)
throw new ArgumentNullException("sampleComponents");
if (sampleComponents.Length == 0)
throw new ArgumentException("row is empty");
if (bitsPerComponent <= 0 || bitsPerComponent > 16)
throw new ArgumentOutOfRangeException("bitsPerComponent");
if (componentsPerSample <= 0 || componentsPerSample > 5)
throw new ArgumentOutOfRangeException("componentsPerSample");
int sampleCount = sampleComponents.Length / componentsPerSample;
m_samples = new Sample[sampleCount];
for (int i = 0; i < sampleCount; ++i)
{
short[] components = new short[componentsPerSample];
Buffer.BlockCopy(sampleComponents, i * componentsPerSample * sizeof(short), components, 0, componentsPerSample * sizeof(short));
m_samples[i] = new Sample(components, bitsPerComponent);
}
using (BitStream bits = new BitStream())
{
for (int i = 0; i < sampleCount; ++i)
{
for (int j = 0; j < componentsPerSample; ++j)
bits.Write(sampleComponents[i * componentsPerSample + j], bitsPerComponent);
}
m_bytes = new byte[bits.UnderlyingStream.Length];
bits.UnderlyingStream.Seek(0, System.IO.SeekOrigin.Begin);
bits.UnderlyingStream.Read(m_bytes, 0, (int)bits.UnderlyingStream.Length);
}
}
