public override void Write(byte[] buffer, int offset, int count)
{
if (_disposed)
{
throw new ObjectDisposedException();
}
if (!_canWrite)
{
throw new NotSupportedException();
}
// argument validation in interop layer
int bytesWritten;
lock (_nativeFileStream)
{
// we check for count being != 0 because we want to handle negative cases
// as well in the interop layer
while (count != 0)
{
bytesWritten = _nativeFileStream.Write(buffer, offset, count, NativeFileStream.TimeoutDefault);
if (bytesWritten == 0)
{
throw new IOException();
}
offset += bytesWritten;
count -= bytesWritten;
}
}
}
internal static void CompareImage(Image from, Image to, string file = null)
{
// Check that description is identical to original image loaded from the disk.
Assert.AreEqual(from.Description, to.Description, "Image description is different for image [{0}]", file);
// Check that number of buffers are identical.
Assert.AreEqual(from.PixelBuffer.Count, to.PixelBuffer.Count, "PixelBuffer size is different for image [{0}]", file);
// Compare each pixel buffer
for (int j = 0; j < from.PixelBuffer.Count; j++)
{
var srcPixelBuffer = from.PixelBuffer[j];
var dstPixelBuffer = to.PixelBuffer[j];
// Check only row and slice pitch
Assert.AreEqual(srcPixelBuffer.RowStride, dstPixelBuffer.RowStride, "RowPitch is different for index [{0}], image [{1}]", j, file);
Assert.AreEqual(srcPixelBuffer.BufferStride, dstPixelBuffer.BufferStride, "SlicePitch is different for index [{0}], image [{1}]", j, file);
var isSameBuffer = Utilities.CompareMemory(srcPixelBuffer.DataPointer, dstPixelBuffer.DataPointer, srcPixelBuffer.BufferStride);
if (!isSameBuffer)
{
var stream = new NativeFileStream("test_from.dds", NativeFileMode.Create, NativeFileAccess.Write, NativeFileShare.Write);
stream.Write(srcPixelBuffer.DataPointer, 0, srcPixelBuffer.BufferStride);
stream.Close();
stream = new NativeFileStream("test_to.dds", NativeFileMode.Create, NativeFileAccess.Write, NativeFileShare.Write);
stream.Write(dstPixelBuffer.DataPointer, 0, dstPixelBuffer.BufferStride);
stream.Close();
}
Assert.True(isSameBuffer, "Content of PixelBuffer is different for index [{0}], image [{1}]", j, file);
}
}
