ExcStatus SetParams(
const ImageColorSpec& colorSpec,
const ImageSamplingGeometry& geometry)
{
ImageEnumSampling m_enumSampling;
m_enumSampling = geometry.EnumSampling();
if(JC_YCBCR == m_color && JC_GRAY == u2j_cmap[colorSpec.EnumColorSpace()])
m_nchannels = 1;
m_color = u2j_cmap[colorSpec.EnumColorSpace()];
m_sampling = u2j_smap[m_enumSampling];
m_precision = colorSpec.DataRange()[0].BitDepth() + 1;
m_size.width = geometry.RefGridRect().Width();
m_size.height = geometry.RefGridRect().Height();
return ExcStatusOk;
} // JPEGDecoder::SetParams()
ExcStatus ReadHeader(
ImageColorSpec& colorSpec,
ImageSamplingGeometry& geometry)
{
int i;
Point origin;
RectSize size;
Rect refgrid;
JERRCODE jerr;
jerr = CJPEGDecoder::ReadHeader(&m_size.width, &m_size.height, &m_nchannels, &m_color, &m_sampling, &m_precision);
if(JPEG_OK != jerr)
return ExcStatusFail;
origin.SetX(0);
origin.SetY(0);
size.SetWidth(m_size.width);
size.SetHeight(m_size.height);
refgrid.SetOrigin(origin);
refgrid.SetSize(size);
geometry.SetRefGridRect(refgrid);
geometry.ReAlloc(m_nchannels);
geometry.SetEnumSampling(j2u_smap[m_sampling]);
colorSpec.ReAlloc(m_nchannels);
colorSpec.SetColorSpecMethod(UIC::Enumerated);
colorSpec.SetComponentToColorMap(UIC::Direct);
colorSpec.SetEnumColorSpace(j2u_cmap[m_color]);
if(m_precision <= 8)
{
for(i = 0; i < m_nchannels; i++)
colorSpec.DataRange()[i].SetAsRange8u((1 << m_precision) - 1);
}
else
{
for(i = 0; i < m_nchannels; i++)
colorSpec.DataRange()[i].SetAsRange16u((1 << m_precision) - 1);
}
return ExcStatusOk;
}
IM_ERROR ReadImageBMP(
BaseStreamInput& in,
PARAMS_BMP&,
CIppImage& image)
{
int i;
Image imageCn;
IppiSize roi;
ImageDataPtr dataPtr;
ImageDataOrder dataOrder;
ImageColorSpec colorSpec;
ImageSamplingGeometry geometry;
BMPDecoder decoder;
if(ExcStatusOk != decoder.Init())
return IE_INIT;
if(ExcStatusOk != decoder.AttachStream(in))
return IE_ASTREAM;
if(ExcStatusOk != decoder.ReadHeader(colorSpec,geometry))
return IE_RHEADER;
int nOfComponents = geometry.NOfComponents();
dataOrder.SetDataType(T8u);
dataOrder.ReAlloc(Interleaved, nOfComponents);
dataOrder.PixelStep()[0] = nOfComponents;
dataOrder.LineStep() [0] = geometry.RefGridRect().Width() * nOfComponents + BYTES_PAD(geometry.RefGridRect().Width(), nOfComponents, 1);
imageCn.ColorSpec().ReAlloc(nOfComponents);
imageCn.ColorSpec().SetColorSpecMethod(Enumerated);
imageCn.ColorSpec().SetComponentToColorMap(Direct);
for(i = 0; i < nOfComponents; i++)
imageCn.ColorSpec().DataRange()[i].SetAsRange8u(255);
ImageEnumColorSpace in_color;
ImageEnumColorSpace out_color;
in_color = colorSpec.EnumColorSpace();
out_color = in_color;
imageCn.ColorSpec().SetEnumColorSpace(out_color);
image.Color((IM_COLOR)image.UicToIppColor(out_color));
roi.width = geometry.RefGridRect().Width();
roi.height = geometry.RefGridRect().Height();
if(0 != image.Alloc(roi,nOfComponents,8,1))
return IE_ALLOC;
dataPtr.p8u = image;
imageCn.Buffer().Attach(&dataPtr,dataOrder,geometry);
if(ExcStatusOk != decoder.ReadData(imageCn.Buffer().DataPtr(),dataOrder))
return IE_RDATA;
return IE_OK;
} // ReadImageBMP()