public void ToByteArray_CorrectFrame()
{
Bill bill = SampleData.CreateExample4();
bill.Format.OutputSize = OutputSize.A4PortraitSheet;
using MetafileCanvas canvas = new MetafileCanvas(QRBill.A4PortraitWidth, QRBill.A4PortraitHeight, "Helvetica, Arial, \"Liberation Sans\"");
QRBill.Draw(bill, canvas);
EmfMetaInfo metaInfo = new EmfMetaInfo(canvas.ToByteArray());
Assert.Equal(257, metaInfo.NumRecords);
var scale = metaInfo.Dpi / 25.4f;
// Returns the frame in pixels
var frame = metaInfo.GetFrame();
Assert.Equal(0, frame.Left);
Assert.Equal(0, frame.Top);
int expectedWidth = (int)(QRBill.A4PortraitWidth * scale);
Assert.InRange(frame.Right, expectedWidth - 2, expectedWidth + 2);
int expectedHeight = (int)(QRBill.A4PortraitHeight * scale);
Assert.InRange(frame.Bottom, expectedHeight - 2, expectedHeight + 2);
}
private static ConversionResult Convert(Stream stream, IReadOnlyDictionary <string, object> context)
{
// copy metafile to buffer
using MemoryStream buffer = new MemoryStream();
stream.CopyTo(buffer);
// retrieve DPI from metafile
EmfMetaInfo metaInfo = new EmfMetaInfo(buffer.ToArray());
int sourceDpi = metaInfo.Dpi;
// read metafile
buffer.Position = 0;
using Metafile metafile = (Metafile)Image.FromStream(buffer);
// compute bitmap size (300 dpi, independent of source DPI)
var pageUnit = GraphicsUnit.Pixel;
var metafileBounds = metafile.GetBounds(ref pageUnit);
float scale = 300f / sourceDpi;
var bitmapRect = new Rectangle(0, 0, (int)Math.Round(metafileBounds.Width * scale), (int)Math.Round(metafileBounds.Height * scale));
// create bitmap and fill with white background
using Bitmap bitmap = new Bitmap(bitmapRect.Width, bitmapRect.Height, PixelFormat.Format24bppRgb);
bitmap.SetResolution(300, 300);
using Graphics graphics = Graphics.FromImage(bitmap);
graphics.FillRectangle(Brushes.White, bitmapRect);
// draw metafile to bitmap
graphics.DrawImage(metafile, bitmapRect, metafileBounds, pageUnit);
// save bitmap as PNG
MemoryStream result = new MemoryStream();
bitmap.Save(result, ImageFormat.Png);
// return PNG
return(new ConversionResult(null, "png", result));
}