/// <summary>
/// Takes an array of bytes representing RGB pixels and outputs the data into a Color32 array.
/// </summary>
public static void BytesToColor32(TiffMetadata metadata, byte[] bytes, Color32[] buf)
{
short samplesPerPixel = metadata.SamplesPerPixel;
if (bytes.Length % samplesPerPixel != 0)
{
// TODO Throw exception
return;
}
int length = bytes.Length / samplesPerPixel;
if (buf.Length != length)
{
// TODO Throw exception
return;
}
// 8 bits per color sample, this will include blank and UNIT formats.
if (metadata.BitsPerSample == 8)
{
Color32 color;
for (int i = 0; i < length; i++)
{
// Greyscale image (1 sample per pixel).
if (samplesPerPixel == 1)
{
color = new Color32(bytes[i], bytes[i], bytes[i], 255);
}
// Color image, either with alpha (4 samples per pixel) or no alpha (3 samples per pixel).
else
{
int j = i * samplesPerPixel;
color = new Color32(bytes[j], bytes[j + 1], bytes[j + 2], (samplesPerPixel == 4) ? bytes[j + 3] : (byte)255);
}
buf[i] = color;
}
}
// TODO Add support for sample rates other than 8 bits per sample.
}
public TiffImage(string filePath)
{
// Store and check the filepath.
_filePath = filePath;
if (string.IsNullOrEmpty(_filePath))
{
throw new FileNotSpecifiedException("No file specified.");
}
// Attempt to open the TIFF image file.
_tiff = Tiff.Open(_filePath, "r");
if (_tiff == null)
{
throw new FileReadException($"Error reading TIFF from {filePath}");
}
// Extract the necessary metadata if the image was loaded sucessfully.
Metadata = new TiffMetadata(_tiff);
PrintInfo();
}
public static T ToColorImage <T>(TiffImage tiff) where T : ColorImage
{
TiffMetadata metadata = tiff.Metadata;
// Check image format.
if (metadata.BitsPerSample != 8)
{
// TODO Add support for sample rates other than 8 bits per sample.
throw new Exception($"Conversion from {metadata.BitsPerSample} bits per sample to color image is currently not supported");
}
// Create an Image object to store the result.
T result = (T)Activator.CreateInstance(typeof(T), metadata.Width, metadata.Height);
// Tiled encoding...
if (metadata.Tiled)
{
Vector2Int tilesAcrossImage = new Vector2Int(
Mathf.CeilToInt(metadata.Width / (float)metadata.TileWidth),
Mathf.CeilToInt(metadata.Height / (float)metadata.TileHeight)
);
// Byte array for buffering the bytes read from each tile.
byte[] tileBytes = new byte[metadata.TileSize];
// Color32 array for buffering the intensity values of each tile.
Color32[] values = new Color32[metadata.TileWidth * metadata.TileHeight];
// Iterate through each tile.
for (int ty = 0; ty < tilesAcrossImage.y; ty++)
{
// The y-coordinate of the tile's top row of pixels on the image.
int y = ty * metadata.TileHeight;
for (int tx = 0; tx < tilesAcrossImage.x; tx++)
{
// The x-coordinate of the tile's left column of pixels on the image.
int x = tx * metadata.TileWidth;
// Read bytes from tile and convert them to pixel values.
tiff.ReadTile(tileBytes, 0, x, y, 0, 0);
TiffUtils.BytesToColor32(metadata, tileBytes, values);
// Iterate through the intensity values in the tile.
for (int i = 0; i < values.Length; i++)
{
// Calculate the x and y coordinate relative to the tile
// based on the index of the pixel within the tile.
Vector2Int tilePixel = ImageUtils.IndexToCoordinates(i, metadata.TileWidth);
// Update the Image object with the pixel value.
result.SetPixel(tilePixel.x + x, tilePixel.y + y, values[i]);
}
}
}
}
// Scanline encoding...
else
{
// Byte array for buffering the bytes read from each scanline.
byte[] scanlineBytes = new byte[metadata.ScanlineSize];
// Color32 array for buffering the intensity values of each pixels in a scanline.
Color32[] values = new Color32[metadata.Width];
// Iterate through all the scanlines.
for (int y = 0; y < metadata.Height; y++)
{
// Read bytes from scanline and convert them to pixel values.
tiff.ReadScanline(scanlineBytes, y);
TiffUtils.BytesToColor32(metadata, scanlineBytes, values);
// Iterate through all the pixel values in the scanline.
for (int x = 0; x < metadata.Width; x++)
{
// Update the Image object with the pixel value.
result.SetPixel(x, y, values[x]);
}
}
}
return(result);
}
public static IntensityImage ToIntensityImage(TiffImage tiff)
{
TiffMetadata metadata = tiff.Metadata;
// Check image format.
if (metadata.SamplesPerPixel != 1)
{
throw new Exception("Color source cannot be converted into intensity image. Use ToRGBAImage() instead.");
}
// Create an Image object to store the result.
IntensityImage result = new IntensityImage(metadata.Width, metadata.Height);
// Tiled encoding...
if (metadata.Tiled)
{
Vector2Int tilesAcrossImage = new Vector2Int(
Mathf.CeilToInt(metadata.Width / (float)metadata.TileWidth),
Mathf.CeilToInt(metadata.Height / (float)metadata.TileHeight)
);
// Byte array for buffering the bytes read from each tile.
byte[] tileBytes = new byte[metadata.TileSize];
// Float array for buffering the intensity values of each tile.
float[] values = new float[metadata.TileWidth * metadata.TileHeight];
// Iterate through each tile.
for (int ty = 0; ty < tilesAcrossImage.y; ty++)
{
// The y-coordinate of the tile's top row of pixels on the image.
int y = ty * metadata.TileHeight;
for (int tx = 0; tx < tilesAcrossImage.x; tx++)
{
// The x-coordinate of the tile's left column of pixels on the image.
int x = tx * metadata.TileWidth;
// Read bytes from tile and convert them to pixel values.
tiff.ReadTile(tileBytes, 0, x, y, 0, 0);
TiffUtils.BytesToFloat(tileBytes, values);
// Iterate through the intensity values in the tile.
for (int i = 0; i < values.Length; i++)
{
// Calculate the x and y coordinate relative to the tile
// based on the index of the pixel within the tile.
Vector2Int tilePixel = ImageUtils.IndexToCoordinates(i, metadata.TileWidth);
// Update the Image object with the pixel value.
result.SetPixel(tilePixel.x + x, tilePixel.y + y, values[i]);
}
}
}
}
// Scanline encoding...
else
{
// Byte array for buffering the bytes read from each scanline.
byte[] scanlineBytes = new byte[metadata.ScanlineSize];
// Float array for buffering the intensity values of each pixels in a scanline.
float[] values = new float[metadata.Width];
// Iterate through all the scanlines.
for (int y = 0; y < metadata.Height; y++)
{
// Read bytes from scanline and convert them to pixel values.
tiff.ReadScanline(scanlineBytes, y);
TiffUtils.BytesToFloat(scanlineBytes, values);
// Iterate through all the pixel values in the scanline.
for (int x = 0; x < metadata.Width; x++)
{
// Update the Image object with the pixel value.
result.SetPixel(x, y, values[x]);
}
}
}
return(result);
}
