public KrecImage(int width,
int height,
int bytesPerLine,
float horizontalResolution,
float verticalResolution,
KrecImagePixelFormat pixelFormat,
[NotNull] byte[] imageData)
{
this.width = width;
this.height = height;
this.bytesPerLine = bytesPerLine;
this.horizontalResolution = horizontalResolution;
this.verticalResolution = verticalResolution;
format = pixelFormat;
this.imageData = imageData;
var bytesPerPixel = pixelFormat.BytesPerPixel();
if (bytesPerLine < bytesPerPixel * width)
{
throw new ArgumentException(
string.Format("Number of bytes per line ({0}) is less than needed for the specified image width ({1}) and pixel format ({2})",
bytesPerLine, width, pixelFormat));
}
if (imageData.Length < (height * bytesPerLine))
{
throw new ArgumentException(
string.Format("Pixel data array for image is too small (size = {0}) for given bytes per line ({1}) and height ({2})",
imageData.Length, bytesPerLine, height));
}
}
/// <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));
}