private static ImageFormat ToSystemImageFormat(PdfRendererImageFormat pdfRendererImageFormat)
{
switch (pdfRendererImageFormat)
{
case PdfRendererImageFormat.Bmp:
return(ImageFormat.Bmp);
case PdfRendererImageFormat.Gif:
return(ImageFormat.Gif);
case PdfRendererImageFormat.Jpeg:
return(ImageFormat.Jpeg);
case PdfRendererImageFormat.Png:
default:
return(ImageFormat.Png);
case PdfRendererImageFormat.Tiff:
return(ImageFormat.Tiff);
}
}
/// <summary>
/// <inheritdoc/>
/// </summary>
/// <param name="page"></param>
/// <param name="pageScale"></param>
/// <param name="imageFormat"></param>
/// <returns></returns>
public byte[] Render(Page page, double pageScale, PdfRendererImageFormat imageFormat = PdfRendererImageFormat.Png)
{
using (var ms = new MemoryStream())
using (var bitmap = new Bitmap((int)Math.Ceiling(page.Width * pageScale), (int)Math.Ceiling(page.Height * pageScale), PixelFormat.Format32bppRgb))
using (var currentGraphics = Graphics.FromImage(bitmap))
{
//bitmap.SetResolution(300, 300);
currentGraphics.SmoothingMode = SmoothingMode.HighQuality;
currentGraphics.CompositingQuality = CompositingQuality.HighQuality;
currentGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
currentGraphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
currentGraphics.Clear(Color.White);
// flip transform
currentGraphics.Transform = GetInitialMatrix(page.Rotation.Value, page.CropBox);
currentGraphics.TranslateTransform(0, -(float)page.Height, MatrixOrder.Append);
currentGraphics.ScaleTransform((float)pageScale, -(float)pageScale, MatrixOrder.Append);
foreach (var image in page.GetImages())
{
DrawImage(image, currentGraphics);
}
foreach (var path in page.ExperimentalAccess.Paths)
{
GraphicsPath gp = new GraphicsPath();
foreach (var subpath in path)
{
foreach (var command in subpath.Commands)
{
if (command is Move)
{
gp.StartFigure();
}
else if (command is Line line)
{
gp.AddLine((float)line.From.X, (float)line.From.Y, (float)line.To.X, (float)line.To.Y);
}
else if (command is BezierCurve curve)
{
gp.AddBezier((float)curve.StartPoint.X, (float)curve.StartPoint.Y,
(float)curve.FirstControlPoint.X, (float)curve.FirstControlPoint.Y,
(float)curve.SecondControlPoint.X, (float)curve.SecondControlPoint.Y,
(float)curve.EndPoint.X, (float)curve.EndPoint.Y);
}
else if (command is Close)
{
gp.CloseFigure();
}
else
{
throw new ArgumentException();
}
}
}
if (path.IsFilled)
{
gp.FillMode = ToSystemFillMode(path.FillingRule);
#pragma warning disable IDE0063 // Use simple 'using' statement
using (var brush = new SolidBrush(ToSystemColor(path.FillColor)))
#pragma warning restore IDE0063 // Use simple 'using' statement
{
currentGraphics.FillPath(brush, gp);
}
}
if (path.IsStroked)
{
try
{
#pragma warning disable IDE0063 // Use simple 'using' statement
using (var pen = new Pen(ToSystemColor(path.StrokeColor)))
#pragma warning restore IDE0063 // Use simple 'using' statement
{
currentGraphics.DrawPath(pen, gp);
}
}
catch (OutOfMemoryException)
{
//you will get an OutOfMemoryException if you try to use a LinearGradientBrush to fill a rectangle whose width or height is zero
var bounds = gp.GetBounds();
if (bounds.Width >= 1 && bounds.Height >= 1)
{
throw;
}
}
}
}
bitmap.Save(ms, ToSystemImageFormat(imageFormat));
return(ms.ToArray());
}
}
