public Bitmap CreateBarCode(
string inputPath,
BarCodeParameters parameters,
FfmpegWrapper ffmpeg,
CancellationToken cancellationToken,
IProgress <double> progress = null)
{
Bitmap finalBitmap = null;
Graphics finalBitmapGraphics = null;
Graphics GetDrawingSurface(int width, int height)
{
if (finalBitmap == null)
{
finalBitmap = new Bitmap(width, height);
finalBitmapGraphics = Graphics.FromImage(finalBitmap);
}
return(finalBitmapGraphics);
}
var barCount = (int)Math.Round((double)parameters.Width / parameters.BarWidth);
var source = ffmpeg.GetImagesFromMedia(inputPath, barCount, cancellationToken);
int?finalBitmapHeight = null;
int x = 0;
foreach (var image in source)
{
if (finalBitmapHeight == null)
{
finalBitmapHeight = parameters.Height ?? image.Height;
}
var surface = GetDrawingSurface(parameters.Width, finalBitmapHeight.Value);
surface.DrawImage(image, x, 0, parameters.BarWidth, finalBitmapHeight.Value);
x += parameters.BarWidth;
progress?.Report((double)x / parameters.Width);
image.Dispose();
}
finalBitmapGraphics?.Dispose();
return(finalBitmap);
}
GetValidatedParameters()
{
var inputPath = inputPathTextBox.Text.Trim(new[] { '"' });
if (!File.Exists(inputPath))
{
throw new Exception("The input file does not exist.");
}
var outputPath = outputPathTextBox.Text.Trim(new[] { '"' });
void ValidateOutputPath(ref string path)
{
if (string.IsNullOrWhiteSpace(path))
{
path = "output.png";
}
if (!Path.HasExtension(path))
{
path += ".png";
}
if (path.Any(x => Path.GetInvalidPathChars().Contains(x)))
{
throw new Exception("The output path is invalid.");
}
if (File.Exists(path))
{
var promptResult = MessageBox.Show(this,
$"The file '{path}' already exists. Do you want to overwrite it?",
"Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
if (promptResult != DialogResult.Yes)
{
throw new OperationCanceledException();
}
}
}
ValidateOutputPath(ref outputPath);
string smoothedOutputPath = null;
if (smoothCheckBox.Checked)
{
var name = $"{Path.GetFileNameWithoutExtension(outputPath)}_smoothed{Path.GetExtension(outputPath)}";
smoothedOutputPath = Path.Combine(Path.GetDirectoryName(outputPath), name);
ValidateOutputPath(ref smoothedOutputPath);
}
if (!int.TryParse(barWidthTextBox.Text, out var barWidth) || barWidth <= 0)
{
throw new Exception("Invalid bar width.");
}
if (!int.TryParse(imageWidthTextBox.Text, out var imageWidth) || imageWidth <= 0)
{
throw new Exception("Invalid output width.");
}
int?imageHeight = null;
if (!useInputHeightForOutputCheckBox.Checked)
{
if (int.TryParse(imageHeightTextBox.Text, out var nonNullableImageHeight) && nonNullableImageHeight > 0)
{
imageHeight = nonNullableImageHeight;
}
else
{
throw new Exception("Invalid output height.");
}
}
var parameters = new BarCodeParameters()
{
BarWidth = barWidth,
Width = imageWidth,
Height = imageHeight
};
return(inputPath, outputPath, smoothedOutputPath, parameters);
}