public async Task <string> StartProcessing(InstructionSet instructions)
{
string validationResult = Validate(instructions);
if (validationResult != null)
{
return(validationResult);
}
Size?dims = ImageHelper.GetDimensions(instructions.InputPath);
if (dims == null)
{
return(null);
}
string inputPath = instructions.InputPath;
int minZoom = instructions.MinimumZoom;
int maxZoom = instructions.MaximumZoom;
string outputDirectory = instructions.OutputDirectory;
string baseName = instructions.OutputName;
ImageFormat outputFormat = instructions.OutputFormat;
string outputExtension = outputFormat.GetFileExtension();
int outputSize = instructions.OutputSize;
return(await Task <string> .Run(() =>
{
try
{
int processed = 0;
for (int zoom = minZoom; zoom <= maxZoom; zoom++)
{
if (ProgressChanged != null)
{
ProgressChanged(this, new ProgressChangedEventArgs(processed, "Processing zoom " + zoom));
}
int tiles = 1 << zoom;
var input = new MagickImage(inputPath);
input.Resize(outputSize *tiles, outputSize *tiles);
var x = -1;
var y = 0;
foreach (var tile in input.CropToTiles(outputSize, outputSize))
{
x++;
y += x / tiles;
x %= tiles;
var outPath = Path.Combine(outputDirectory,
string.Format("{0}.{1}.{2}.{3}{4}", baseName, zoom, x, y, outputExtension));
if (!instructions.SkipExisting || !File.Exists(outPath))
{
tile.Write(outPath);
}
if (ProgressChanged != null)
{
ProgressChanged(this,
new ProgressChangedEventArgs(++processed, "Processing zoom " + zoom));
}
}
// RunMagick(string.Format(
// "\"{6}\" -resize {0}x{0} -crop {1}x{1} -set filename:tile \"%[fx:page.x/{1}].%[fx:page.y/{1}]\" " +
// "+repage +adjoin \"{2}/{3}.{4}.%[filename:tile]{5}\"", outputSize * tiles, outputSize,
// outputDirectory, baseName, zoom, outputExtension, inputPath));
}
}
catch (Exception e)
{
return e.Message;
}
return null;
}));
}
