/// <summary>
/// Get a bitmap of the current browsers Window.
/// Works on Visible or InVisible windows.
/// </summary>
/// <param name="xOffset"></param>
/// <param name="yOffset"></param>
/// <param name="width">Width length of returned bitmap in pixels</param>
/// <param name="height">Height length of returned bitmap in pixels</param>
/// <returns></returns>
/// <throws>ArgumentException if width or height is zero</throws>
public Bitmap GetBitmap(uint xOffset, uint yOffset, uint width, uint height)
{
if (width == 0)
throw new ArgumentException("width");
if (height == 0)
throw new ArgumentException("height");
// Use of the canvas technique was inspired by: the abduction! firefox plugin by Rowan Lewis
// https://addons.mozilla.org/en-US/firefox/addon/abduction/
// Some opertations fail without a proper JSContext.
using (AutoJSContext jsContext = new AutoJSContext())
{
GeckoCanvasElement canvas = (GeckoCanvasElement)m_browser.Document.CreateElement("canvas");
canvas.Width = width;
canvas.Height = height;
nsIDOMHTMLCanvasElement canvasPtr = (nsIDOMHTMLCanvasElement)canvas.DomObject;
nsIDOMCanvasRenderingContext2D context;
using (nsAString str = new nsAString("2d"))
{
context = (nsIDOMCanvasRenderingContext2D)canvasPtr.MozGetIPCContext(str);
}
using (nsAString color = new nsAString("rgb(255,255,255)"))
{
context.DrawWindow((nsIDOMWindow)m_browser.Window.DomWindow, xOffset, yOffset, width, height, color, 0);
}
string data = canvas.toDataURL("image/png");
byte[] bytes = Convert.FromBase64String(data.Substring("data:image/png;base64,".Length));
return (Bitmap)Bitmap.FromStream(new System.IO.MemoryStream(bytes));
}
}
/// <summary>
/// Inserts a rule at the specified position in the collection. The return value is the index in the list where the item was actually inserted,
/// or -1 if the rule contains syntax errors and could not be added to the collection.
/// </summary>
/// <param name="index"></param>
/// <param name="rule"></param>
public int Insert(int index, string rule)
{
if (IsReadOnly)
{
throw new InvalidOperationException("This collection is read-only.");
}
else if (index < 0 || index > Count)
{
throw new ArgumentOutOfRangeException("index");
}
else if (string.IsNullOrEmpty(rule))
{
return(-1);
}
const int NS_ERROR_DOM_SYNTAX_ERR = unchecked ((int)0x8053000c);
using (AutoJSContext context = new AutoJSContext())
{
index = (int)StyleSheet._DomStyleSheet.InsertRule(new nsAString(rule), (uint)index);
}
return(index);
}
public void EnableJavascriptDebugger()
{
if (m_javascriptDebuggingEnabled)
return;
using (var a = new AutoJSContext())
{
var jsd = Xpcom.GetService<jsdIDebuggerService>("@mozilla.org/js/jsd/debugger-service;1");
jsd.SetErrorHookAttribute(new JSErrorHandler(this));
nsIJSRuntimeService runtime = Xpcom.GetService<nsIJSRuntimeService>("@mozilla.org/js/xpc/RuntimeService;1");
jsd.ActivateDebugger(runtime.GetRuntimeAttribute());
Marshal.ReleaseComObject(runtime);
Marshal.ReleaseComObject(jsd);
}
m_javascriptDebuggingEnabled = true;
}
public string ToString()
{
// TODO if (!IsString)
// throw new NotImplementedException("JsVal.ToString() only supported when the type is String.");
using (AutoJSContext context = new AutoJSContext())
{
return Marshal.PtrToStringAnsi(JS_EncodeString(context.ContextPointer, Ptr));
}
}
