private Bitmap RenderHtml(Size maxSize, string html, Dictionary<string, Image> images)
{
// encode the HTML page text to bytes
byte[] htmlData = Encoding.UTF8.GetBytes(html);
using (HTMLite hLite = new HTMLite())
{
// this callback is used to load images
hLite.UriHandler = (uri, type) => LoadUri(uri, type, images);
// load the HTML page data
hLite.LoadHtmlFromMemory("content.html", htmlData);
// set the HTML page size to the maximum size
Size size = maxSize;
hLite.Measure(size.Width, size.Height);
// detect the actual size
var bounds = hLite.GetRootElement().Select("#bounds");
if (bounds.Count > 0)
{
size = bounds[0].Bounds.Size;
size.Width += bounds[0].Bounds.Left * 2;
size.Height += bounds[0].Bounds.Top * 2;
}
hLite.Measure(size.Width, size.Height);
// render the HTML page to the image
Bitmap img = new Bitmap(size.Width, size.Height, pixFormat);
using (Graphics g = Graphics.FromImage(img))
{
g.Clear(Color.Transparent);
hLite.Render(g, 0, 0, img.Width, img.Height);
}
return img;
}
}
private byte[] LoadUri(string uri, HTMLite.ResourceType type, Dictionary<string, Image> images)
{
Image img;
if (images.TryGetValue(uri, out img))
{
// serialize the image to a stream of bytes
using (MemoryStream ms = new MemoryStream())
{
lock (gdiLock)
{
img.Save(ms, imgFormat);
}
byte[] data = ms.ToArray();
return data;
}
}
return null;
}
