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//
// (C) CharLS Team 2014, all rights reserved. See the accompanying "License.txt" for licensed use.
//
#include "jpegstreamwriter.h"
#include "util.h"
#include "jpegmarkersegment.h"
#include "jpegimagedatasegment.h"
#include "jpegmarkercode.h"
#include "jpegstreamreader.h"
#include <vector>
using namespace std;
using namespace charls;
namespace
{
bool IsDefault(const JlsCustomParameters& custom)
{
if (custom.MAXVAL != 0)
return false;
if (custom.T1 != 0)
return false;
if (custom.T2 != 0)
return false;
if (custom.T3 != 0)
return false;
if (custom.RESET != 0)
return false;
return true;
}
}
JpegStreamWriter::JpegStreamWriter() :
_bCompare(false),
_data(),
_byteOffset(0),
_lastCompenentIndex(0)
{
}
void JpegStreamWriter::AddColorTransform(ColorTransformation transformation)
{
AddSegment(JpegMarkerSegment::CreateColorTransformSegment(transformation));
}
size_t JpegStreamWriter::Write(const ByteStreamInfo& info)
{
_data = info;
WriteMarker(JpegMarkerCode::StartOfImage);
for (size_t i = 0; i < _segments.size(); ++i)
{
_segments[i]->Serialize(*this);
}
//_bCompare = false;
WriteMarker(JpegMarkerCode::EndOfImage);
return _byteOffset;
}
void JpegStreamWriter::AddScan(const ByteStreamInfo& info, const JlsParameters& params)
{
if (!IsDefault(params.custom))
{
AddSegment(JpegMarkerSegment::CreateJpegLSExtendedParametersSegment(params.custom));
}
else if (params.bitsPerSample > 12)
{
JlsCustomParameters preset = ComputeDefault((1 << params.bitsPerSample) - 1, params.allowedLossyError);
AddSegment(JpegMarkerSegment::CreateJpegLSExtendedParametersSegment(preset));
}
// Note: it is a common practice to start to count components by index 1.
_lastCompenentIndex += 1;
int componentCount = params.interleaveMode == InterleaveMode::None ? 1 : params.components;
AddSegment(JpegMarkerSegment::CreateStartOfScanSegment(_lastCompenentIndex, componentCount, params.allowedLossyError, params.interleaveMode));
AddSegment(make_unique<JpegImageDataSegment>(info, params, componentCount));
}
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