public virtual void Extract(sbyte[] segmentBytes, Com.Drew.Metadata.Metadata metadata, JpegSegmentType segmentType)
{
JpegDirectory directory = new JpegDirectory();
metadata.AddDirectory(directory);
// The value of TAG_COMPRESSION_TYPE is determined by the segment type found
directory.SetInt(JpegDirectory.TagCompressionType, segmentType.byteValue - JpegSegmentType.Sof0.byteValue);
SequentialReader reader = new SequentialByteArrayReader(segmentBytes);
try
{
directory.SetInt(JpegDirectory.TagDataPrecision, reader.GetUInt8());
directory.SetInt(JpegDirectory.TagImageHeight, reader.GetUInt16());
directory.SetInt(JpegDirectory.TagImageWidth, reader.GetUInt16());
short componentCount = reader.GetUInt8();
directory.SetInt(JpegDirectory.TagNumberOfComponents, componentCount);
// for each component, there are three bytes of data:
// 1 - Component ID: 1 = Y, 2 = Cb, 3 = Cr, 4 = I, 5 = Q
// 2 - Sampling factors: bit 0-3 vertical, 4-7 horizontal
// 3 - Quantization table number
for (int i = 0; i < (int)componentCount; i++)
{
int componentId = reader.GetUInt8();
int samplingFactorByte = reader.GetUInt8();
int quantizationTableNumber = reader.GetUInt8();
JpegComponent component = new JpegComponent(componentId, samplingFactorByte, quantizationTableNumber);
directory.SetObject(JpegDirectory.TagComponentData1 + i, component);
}
}
catch (IOException ex)
{
directory.AddError(ex.Message);
}
}
public virtual void Extract(sbyte[] segmentBytes, Com.Drew.Metadata.Metadata metadata, JpegSegmentType segmentType)
{
JpegDirectory directory = new JpegDirectory();
metadata.AddDirectory(directory);
// The value of TAG_COMPRESSION_TYPE is determined by the segment type found
directory.SetInt(JpegDirectory.TagCompressionType, segmentType.byteValue - JpegSegmentType.Sof0.byteValue);
SequentialReader reader = new SequentialByteArrayReader(segmentBytes);
try
{
directory.SetInt(JpegDirectory.TagDataPrecision, reader.GetUInt8());
directory.SetInt(JpegDirectory.TagImageHeight, reader.GetUInt16());
directory.SetInt(JpegDirectory.TagImageWidth, reader.GetUInt16());
short componentCount = reader.GetUInt8();
directory.SetInt(JpegDirectory.TagNumberOfComponents, componentCount);
// for each component, there are three bytes of data:
// 1 - Component ID: 1 = Y, 2 = Cb, 3 = Cr, 4 = I, 5 = Q
// 2 - Sampling factors: bit 0-3 vertical, 4-7 horizontal
// 3 - Quantization table number
for (int i = 0; i < (int)componentCount; i++)
{
int componentId = reader.GetUInt8();
int samplingFactorByte = reader.GetUInt8();
int quantizationTableNumber = reader.GetUInt8();
JpegComponent component = new JpegComponent(componentId, samplingFactorByte, quantizationTableNumber);
directory.SetObject(JpegDirectory.TagComponentData1 + i, component);
}
}
catch (IOException ex)
{
directory.AddError(ex.Message);
}
}
public virtual void TestGetComponentDescription()
{
JpegComponent component1 = new JpegComponent(1, unchecked ((int)(0x22)), 0);
_directory.SetObject(JpegDirectory.TagComponentData1, component1);
Sharpen.Tests.AreEqual("Y component: Quantization table 0, Sampling factors 2 horiz/2 vert", _directory.GetDescription(JpegDirectory.TagComponentData1));
Sharpen.Tests.AreEqual("Y component: Quantization table 0, Sampling factors 2 horiz/2 vert", _descriptor.GetComponentDataDescription(0));
}
public virtual void TestGetComponent()
{
JpegComponent component1 = new JpegComponent(1, 2, 3);
JpegComponent component2 = new JpegComponent(1, 2, 3);
JpegComponent component3 = new JpegComponent(1, 2, 3);
JpegComponent component4 = new JpegComponent(1, 2, 3);
_directory.SetObject(JpegDirectory.TagComponentData1, component1);
_directory.SetObject(JpegDirectory.TagComponentData2, component2);
_directory.SetObject(JpegDirectory.TagComponentData3, component3);
_directory.SetObject(JpegDirectory.TagComponentData4, component4);
// component numbers are zero-indexed for this method
NUnit.Framework.Assert.AreSame(component1, _directory.GetComponent(0));
NUnit.Framework.Assert.AreSame(component2, _directory.GetComponent(1));
NUnit.Framework.Assert.AreSame(component3, _directory.GetComponent(2));
NUnit.Framework.Assert.AreSame(component4, _directory.GetComponent(3));
}