public RendererResult Render(Input input)
{
#pragma warning disable CS0420 // A reference to a volatile field will not be treated as volatile
var cacheInfo = new HtmlRendererCache.Info(
input.Content,
input.Foreground,
input.Background,
input.Font,
input.ZoomScale * ExtensionSettings.Instance.CustomZoomScale,
CacheVersion);
if (cache.TryGetImage(cacheInfo, out rendererResult))
{
return(rendererResult.Value);
}
#pragma warning restore CS0420 // A reference to a volatile field will not be treated as volatile
documentCompleted = false;
mathJaxRenderingDone = false;
objectForScripting.ClearErrors();
rendererResult = null;
webBrowser.DocumentText = GetHtmlSource(input);
currentContent = input.Content;
//wait until document is loaded
while (!documentCompleted)
{
Thread.Sleep(WaitingIntervalMs);
}
RenderInternal(input);
//wait until result image is ready
while (!rendererResult.HasValue)
{
Thread.Sleep(WaitingIntervalMs);
}
return(rendererResult.Value);
}
private unsafe void RenderInternal(Input input)
{
if (webBrowser.InvokeRequired)
{
//wait until MathJax is done with rendering
while (!mathJaxRenderingDone)
{
Thread.Sleep(WaitingIntervalMs);
}
webBrowser.Invoke(new Action <Input>(RenderInternal), input);
}
else
{
webBrowser.Width = (int)(input.ZoomScale * ExtensionSettings.Instance.CustomZoomScale * DefaultBrowserWidth);
webBrowser.Height = (int)(input.ZoomScale * ExtensionSettings.Instance.CustomZoomScale * DefaultBrowserHeight);
const int ExtraMargin = 4;
var myDiv = webBrowser.Document.GetElementById("myDiv");
var width = (myDiv.OffsetRectangle.X + myDiv.ScrollRectangle.Width) + ExtraMargin;
var height = (myDiv.OffsetRectangle.Y + myDiv.ScrollRectangle.Height) + ExtraMargin;
webBrowser.Width = width;
webBrowser.Height = height;
webBrowser.Document.BackColor = Color.Transparent;
const PixelFormat pixelFormat = PixelFormat.Format32bppArgb;
using (var bitmap = new Bitmap(width, height, pixelFormat))
{
if (webBrowser.Document.DomDocument is IViewObject viewObject)
{
var webBrowserRectangle = new TagRECT(myDiv.OffsetRectangle);
var bitmapRectangle = new TagRECT(0, 0, width, height);
using (var gr = Graphics.FromImage(bitmap))
{
var hdc = gr.GetHdc();
try
{
int hr = viewObject.Draw(1 /*DVASPECT_CONTENT*/,
-1, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero,
hdc,
ref bitmapRectangle,
ref webBrowserRectangle,
IntPtr.Zero, 0);
}
finally
{
gr.ReleaseHdc();
}
}
var background = BGRA.From(input.Background);
using (var croppedBitmap = CropToContent(bitmap, background))
{
MakeBackgroundTransparent(croppedBitmap, background);
var bitmapSource = ResourcesManager.CreateBitmapSourceWithCurrentDpi(croppedBitmap);
var cacheInfo = new HtmlRendererCache.Info(
currentContent,
input.Foreground,
input.Background,
input.Font,
input.ZoomScale * ExtensionSettings.Instance.CustomZoomScale,
CacheVersion);
var errors = objectForScripting.Errors.Count == 0 ? Array.Empty <string>() : objectForScripting.Errors.ToArray();
var cachedImagePath = errors.Length == 0 ? cache.Add(cacheInfo, croppedBitmap) : null;
rendererResult = new RendererResult(bitmapSource, cachedImagePath, errors);
}
}
}
}
}