public static bool ReadFromFile(string fileName, ref MemoryBlock memBlock, ref TiffImageInfo tiffInfo)
{
IntPtr tiff = Open(fileName, "r");
if (tiff == IntPtr.Zero)
{
throw new Exception("Unable to open TIFF file: " + fileName);
}
try
{
UInt16 i16buf = 0; // буфер для чтения параметров
GetIntField(tiff, FieldName.PLANARCONFIG, ref i16buf);
tiffInfo.config = (PlanarConfig)i16buf;
GetIntField(tiff, FieldName.BITSPERSAMPLE, ref tiffInfo.bps);
GetIntField(tiff, FieldName.SAMPLESPERPIXEL, ref tiffInfo.spp);
if ((tiffInfo.bps != 1 && tiffInfo.bps != 8) ||
tiffInfo.spp != 1 ||
tiffInfo.config != PlanarConfig.CONTIG)
{
throw new Exception("TIFF parameters do not meet requirements: bps = " + tiffInfo.bps + ", spp = " + tiffInfo.spp + ", config = " + tiffInfo.config);
}
GetIntField(tiff, FieldName.IMAGEWIDTH, ref tiffInfo.width);
GetIntField(tiff, FieldName.IMAGELENGTH, ref tiffInfo.height);
GetIntField(tiff, FieldName.PHOTOMETRIC, ref i16buf);
tiffInfo.photometric = (Photometric)i16buf;
if (tiffInfo.photometric != Photometric.MINISWHITE &&
tiffInfo.photometric != Photometric.MINISBLACK)
{
tiffInfo.photometric = Photometric.MINISBLACK;
}
if (memBlock == null)
{
memBlock = new MemoryBlock();
}
int nSize = (int)((tiffInfo.width * tiffInfo.height * tiffInfo.bps) / 8);
if (memBlock.SizeOf < nSize)
{
memBlock.Free();
memBlock.Alloc(nSize);
}
IntPtr pMemory = memBlock.ToPointer();
int scanSize = GetScanlineSize(tiff);
IntPtr bufPtr = Marshal.AllocHGlobal(scanSize);
byte[] oTemp = new byte[nSize];
try
{
for (int row = 0; row < tiffInfo.height; row++)
{
ReadScanline(tiff, bufPtr, row, 0);
int nDelta = (int)((tiffInfo.width * tiffInfo.bps) / 8 * row);
Marshal.Copy(bufPtr, oTemp, nDelta, scanSize);
}
Marshal.Copy(oTemp, 0, pMemory, nSize);
return true;
}
finally
{
Marshal.FreeHGlobal(bufPtr);
}
}
finally
{
Close(tiff);
}
}
public static bool ReadFromFile(string fileName, ref MemoryBlock memBlock, ref TiffImageInfo tiffInfo)
{
IntPtr tiff = Open(fileName, "r");
if (tiff == IntPtr.Zero)
{
throw new Exception("Unable to open TIFF file: " + fileName);
}
try
{
UInt16 i16buf = 0; // буфер для чтения параметров
GetIntField(tiff, FieldName.PLANARCONFIG, ref i16buf);
tiffInfo.config = (PlanarConfig)i16buf;
GetIntField(tiff, FieldName.BITSPERSAMPLE, ref tiffInfo.bps);
GetIntField(tiff, FieldName.SAMPLESPERPIXEL, ref tiffInfo.spp);
if ((tiffInfo.bps != 1 && tiffInfo.bps != 8) ||
tiffInfo.spp != 1 ||
tiffInfo.config != PlanarConfig.CONTIG)
{
throw new Exception("TIFF parameters do not meet requirements: bps = " + tiffInfo.bps + ", spp = " + tiffInfo.spp + ", config = " + tiffInfo.config);
}
GetIntField(tiff, FieldName.IMAGEWIDTH, ref tiffInfo.width);
GetIntField(tiff, FieldName.IMAGELENGTH, ref tiffInfo.height);
GetIntField(tiff, FieldName.PHOTOMETRIC, ref i16buf);
tiffInfo.photometric = (Photometric)i16buf;
if (tiffInfo.photometric != Photometric.MINISWHITE &&
tiffInfo.photometric != Photometric.MINISBLACK)
{
tiffInfo.photometric = Photometric.MINISBLACK;
}
if (memBlock == null)
{
memBlock = new MemoryBlock();
}
int nSize = (int)((tiffInfo.width * tiffInfo.height * tiffInfo.bps) / 8);
if (memBlock.SizeOf < nSize)
{
memBlock.Free();
memBlock.Alloc(nSize);
}
IntPtr pMemory = memBlock.ToPointer();
int scanSize = GetScanlineSize(tiff);
IntPtr bufPtr = Marshal.AllocHGlobal(scanSize);
byte[] oTemp = new byte[nSize];
try
{
for (int row = 0; row < tiffInfo.height; row++)
{
ReadScanline(tiff, bufPtr, row, 0);
int nDelta = (int)((tiffInfo.width * tiffInfo.bps) / 8 * row);
Marshal.Copy(bufPtr, oTemp, nDelta, scanSize);
}
Marshal.Copy(oTemp, 0, pMemory, nSize);
return(true);
}
finally
{
Marshal.FreeHGlobal(bufPtr);
}
}
finally
{
Close(tiff);
}
}
