internal static Bitmap DecodeImage(BinaryReader reader, ImgInfo imgInfo)
{
// Used for reading those nasty variable length codes
var bReader = new BitReader(reader);
float[][,] img = new float[imgInfo.numOfComponents][, ];
imgInfo.deltaDc = new short[imgInfo.numOfComponents];
for (int ch = 0; ch < imgInfo.numOfComponents; ch++)
{
img[ch] = new float[imgInfo.height, imgInfo.width];
}
try
{
// Determine the width of height of the MCU, based on the read subsampling
// values from all channels (don't know if this is the correct way for all cases)
// but it works for the most common ones
var componentMax = imgInfo.components.Aggregate((a, b) =>
{
return(new Markers.ComponentInfo()
{
samplingFactorX = Math.Max(a.samplingFactorX, b.samplingFactorX),
samplingFactorY = Math.Max(a.samplingFactorY, b.samplingFactorY)
});
});
int sizeMcuX = blkSize * componentMax.samplingFactorX;
int sizeMcuY = blkSize * componentMax.samplingFactorY;
int numMcusX = (imgInfo.width + sizeMcuX - 1) / sizeMcuX;
int numMcusY = (imgInfo.height + sizeMcuY - 1) / sizeMcuY;
for (int mcu = 0; mcu < numMcusX * numMcusY; mcu = NextMcuPos(imgInfo, bReader, mcu, numMcusX, numMcusY))
{
// X and Y coordinates of current MCU
int mcuX = mcu % numMcusX;
int mcuY = mcu / numMcusX;
// Starting X and Y pixels of current MCU
int ofsX = mcuX * sizeMcuX;
int ofsY = mcuY * sizeMcuY;
for (int ch = 0; ch < imgInfo.numOfComponents; ch++)
{
int scaleX = componentMax.samplingFactorX / imgInfo.components[ch].samplingFactorX;
int scaleY = componentMax.samplingFactorY / imgInfo.components[ch].samplingFactorY;
for (int sy = 0; sy < imgInfo.components[ch].samplingFactorY; sy++)
{
for (int sx = 0; sx < imgInfo.components[ch].samplingFactorX; sx++)
{
DecodeBlock(bReader, imgInfo, img[ch], ch, ofsX + blkSize * sx, ofsY + blkSize * sy,
scaleX, scaleY);
}
}
}
if (bReader.PastEndOfFile)
{
break;
}
}
}
catch (Exception ex)
{
/*Logger.WriteLine(ex.Message);
* Logger.WriteLine(ex.StackTrace);*/
}
Color2[,] imagen = MergeChannels(imgInfo, img);
var bmp = new Bitmap(imgInfo.width, imgInfo.height);
var conv = new BmpData(bmp);
bReader.StopReading();
conv.SetImage(imagen);
return(bmp);
}
internal static Bitmap DecodeImage(BinaryReader reader, ImgInfo imgInfo)
{
// Used for reading those nasty variable length codes
BitReader bReader = new BitReader(reader);
float[][,] img = new float[imgInfo.numOfComponents][,];
imgInfo.deltaDc = new short[imgInfo.numOfComponents];
for (int ch = 0; ch < imgInfo.numOfComponents; ch++)
img[ch] = new float[imgInfo.height, imgInfo.width];
try
{
// Determine the width of height of the MCU, based on the read subsampling
// values from all channels (don't know if this is the correct way for all cases)
// but it works for the most common ones
var componentMax = imgInfo.components.Aggregate((a, b) =>
{
return new Markers.ComponentInfo()
{
samplingFactorX = Math.Max(a.samplingFactorX, b.samplingFactorX),
samplingFactorY = Math.Max(a.samplingFactorY, b.samplingFactorY)
};
});
int sizeMcuX = blkSize * componentMax.samplingFactorX;
int sizeMcuY = blkSize * componentMax.samplingFactorY;
int numMcusX = (imgInfo.width + sizeMcuX - 1) / sizeMcuX;
int numMcusY = (imgInfo.height + sizeMcuY - 1) / sizeMcuY;
for (int mcu = 0; mcu < numMcusX * numMcusY; mcu = NextMcuPos(imgInfo, bReader, mcu, numMcusX, numMcusY))
{
// X and Y coordinates of current MCU
int mcuX = mcu % numMcusX;
int mcuY = mcu / numMcusX;
// Starting X and Y pixels of current MCU
int ofsX = mcuX * sizeMcuX;
int ofsY = mcuY * sizeMcuY;
for (int ch = 0; ch < imgInfo.numOfComponents; ch++)
{
int scaleX = componentMax.samplingFactorX / imgInfo.components[ch].samplingFactorX;
int scaleY = componentMax.samplingFactorY / imgInfo.components[ch].samplingFactorY;
for (int sy = 0; sy < imgInfo.components[ch].samplingFactorY; sy++)
{
for (int sx = 0; sx < imgInfo.components[ch].samplingFactorX; sx++)
{
DecodeBlock(bReader, imgInfo, img[ch], ch, ofsX + blkSize * sx, ofsY + blkSize * sy,
scaleX, scaleY);
}
}
}
if (bReader.PastEndOfFile) break;
}
}
catch (Exception ex)
{
Logger.WriteLine(ex.Message);
Logger.WriteLine(ex.StackTrace);
}
Color2[,] imagen = MergeChannels(imgInfo, img);
Bitmap bmp = new Bitmap(imgInfo.width, imgInfo.height);
BmpData conv = new BmpData(bmp);
bReader.StopReading();
conv.SetImage(imagen);
return bmp;
}