public void TestBitPacking_Single16BitFrame()
{
// 1 frame, 5x3
// 11111
// 10010
// 00000
// continuous bit stream: 11111100 1000000x
// continuous LE byte stream: 00111111 x0000001
const string expectedResult = "111111001000000";
var overlayPixels = SwapBytes(new byte[] // written in big endian for ease of reading
{
0x00, 0x10, 0x00, 0x10, 0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
});
// little endian test
{
const int pixelCount = 3 * 5;
byte[] packedBits = new byte[(int)(Math.Ceiling(pixelCount / 8.0))];
OverlayData.TestPack(overlayPixels, packedBits, 0, pixelCount, (ushort)0x00FF, false);
var actualResult = FormatBits(packedBits, false).Substring(0, pixelCount);
Assert.AreEqual(expectedResult, actualResult, "Error in packed bits for 16-bit case (little endian)");
}
// big endian test
{
const int pixelCount = 3 * 5;
byte[] packedBits = new byte[(int)(Math.Ceiling(pixelCount / 8.0))];
OverlayData.TestPack(overlayPixels, packedBits, 0, pixelCount, (ushort)0x00FF, true);
var actualResult = FormatBits(packedBits, true).Substring(0, pixelCount);
Assert.AreEqual(expectedResult, actualResult, "Error in packed bits for 16-bit case (big endian)");
}
}
public void TestBitPacking_Multiple16BitFrames()
{
// 7 frames, each 3x2 (cols, rows) = 42 bits = 6 bytes
// 111 111 111 111 111 111 111
// 000 001 010 011 100 101 110
// continuous bit stream: 11100011 10011110 10111011 11110011 11011111 10xxxxxx
// continuous LE byte stream: 11000111 01111001 11011101 11001111 11111011 xxxxxx01
const string expectedResult = "111000111001111010111011111100111101111110";
var overlayPixels = SwapBytes(new byte[] // written in big endian for convenience
{
// frame 1
0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// frame 2
0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
// frame 3
0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x00, 0x00, 0x10, 0x00, 0x00,
// frame 4
0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x00, 0x00, 0x10, 0x00, 0x10,
// frame 5
0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x10, 0x00, 0x00, 0x00, 0x00,
// frame 6
0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x10, 0x00, 0x00, 0x00, 0x10,
// frame 7
0x00, 0x10, 0x00, 0x10, 0x00, 0x10,
0x00, 0x10, 0x00, 0x10, 0x00, 0x00,
});
// little endian test
{
const bool bigEndian = false;
const int frames = 7;
const int pixelCount = 2 * 3;
byte[] packedBits = new byte[(int)(Math.Ceiling(frames * pixelCount / 8.0))];
// pack the individual frames in no specific order
OverlayData.TestPack(Subarray(overlayPixels, 2 * 0 * pixelCount, 2 * pixelCount), packedBits, 0 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 4 * pixelCount, 2 * pixelCount), packedBits, 4 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 1 * pixelCount, 2 * pixelCount), packedBits, 1 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 5 * pixelCount, 2 * pixelCount), packedBits, 5 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 2 * pixelCount, 2 * pixelCount), packedBits, 2 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 6 * pixelCount, 2 * pixelCount), packedBits, 6 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 3 * pixelCount, 2 * pixelCount), packedBits, 3 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
var actualResult = FormatBits(packedBits, bigEndian).Substring(0, frames * pixelCount);
Assert.AreEqual(expectedResult, actualResult, "Error in packed bits for multiframe 8-bit case (little endian)");
}
// big endian test
{
const bool bigEndian = true;
const int frames = 7;
const int pixelCount = 2 * 3;
byte[] packedBits = new byte[(int)(Math.Ceiling(frames * pixelCount / 8.0))];
// pack the individual frames in no specific order
OverlayData.TestPack(Subarray(overlayPixels, 2 * 0 * pixelCount, 2 * pixelCount), packedBits, 0 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 4 * pixelCount, 2 * pixelCount), packedBits, 4 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 1 * pixelCount, 2 * pixelCount), packedBits, 1 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 5 * pixelCount, 2 * pixelCount), packedBits, 5 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 2 * pixelCount, 2 * pixelCount), packedBits, 2 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 6 * pixelCount, 2 * pixelCount), packedBits, 6 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
OverlayData.TestPack(Subarray(overlayPixels, 2 * 3 * pixelCount, 2 * pixelCount), packedBits, 3 * pixelCount, pixelCount, (ushort)0x00FF, bigEndian);
var actualResult = FormatBits(packedBits, bigEndian).Substring(0, frames * pixelCount);
Assert.AreEqual(expectedResult, actualResult, "Error in packed bits for multiframe 8-bit case (big endian)");
}
}
