/// <summary>
/// Extracts the rectangular part of the image
/// </summary>
/// <param name="x">Left border of part</param>
/// <param name="y">Top border of part</param>
/// <param name="rectWidth">Width of part</param>
/// <param name="rectHeight">Height of part</param>
/// <returns>Part of image</returns>
public KrecImage GetSubregion(int x, int y, int rectWidth, int rectHeight)
{
var sourceBytesPerLine = bytesPerLine;
var bytesPerPixel = format.BytesPerPixel();
var newBytesPerLine = KrecImage.CalculateStride(rectWidth, format);
var newImageData = new byte[rectHeight * newBytesPerLine];
var sourceImageData = imageData;
var sourceIdxDelta = y * sourceBytesPerLine + x * bytesPerPixel;
for (int rowIdx = 0, sourceIdx = sourceIdxDelta, targetIdx = 0;
rowIdx < rectHeight;
rowIdx++, sourceIdx += sourceBytesPerLine, targetIdx += newBytesPerLine)
{
Array.Copy(sourceImageData, sourceIdx, newImageData, targetIdx, rectWidth * bytesPerPixel);
}
return(new KrecImage(rectWidth, rectHeight, newBytesPerLine,
horizontalResolution, verticalResolution, format, newImageData));
}
public KrecImage(KrecImage source, byte[] newImageData)
: this(source, newImageData, source.Format)
{
}
public KrecImage(KrecImage source, byte[] newImageData, KrecImagePixelFormat newKrecImagePixelFormat)
: this(source.Width, source.Height, source.BytesPerLine, source.HorizontalResolution,
source.VerticalResolution, newKrecImagePixelFormat, newImageData)
{
}