Starting with version 4.0, we use the Skia 2D graphics library to render PDF pages.
Methods Page.Save and Document.ConvertToTiff can be used to render pages or documents directly to single- or multipage raster images.
It is however also possible to render to a Skia surface. This is demonstrated by the following code samples.
Open PDF and select the first page
var pdf = new Document(new FileStream(path, FileMode.Open, FileAccess.Read));
var page = pdf.Pages[0];
Calculate the size of the image
const float cScale = 1.0f; // 72 dpi
var pageBox = page.CropBox ?? page.MediaBox;
int width = (int)Math.Round(pageBox.Width * cScale);
int height = (int)Math.Round(pageBox.Height * cScale);
if (pdfPage.Rotation % 180 != 0)
{
int tmp = width;
width = height;
height = tmp;
}