private static Byte[] GetImageData(nsIDOMHTMLCanvasElement canvasElement)
{
String data = XpcomStringHelper.Get(canvasElement.ToDataURLAs, "image/png", String.Empty);
if (String.IsNullOrWhiteSpace(data))
{
return null;
}
#if USE_IOSERVICE
var ioService = Xpcom.GetService<nsIIOService>(Xpcom.NS_IOSERVICE_CONTRACTID);
nsIChannel channel = ioService.NewChannel(data, null, null);
nsIInputStream stream = channel.Open();
try
{
Byte[] imageData = null;
stream.ReadSegments(
delegate(nsIInputStream inStream, IntPtr closure, IntPtr segment, UInt32 offset, UInt32 count, ref UInt32 writeCount)
{
var buffer = new Byte[count];
Marshal.Copy(segment, buffer, 0, buffer.Length);
writeCount = count;
Array.Resize(ref imageData, (imageData != null ? imageData.Length : 0) + buffer.Length);
Array.Copy(buffer, 0, imageData, imageData.Length - buffer.Length, buffer.Length);
return nsResult.NS_OK;
},
IntPtr.Zero, UInt32.MaxValue);
return imageData;
}
finally
{
stream.Close();
Marshal.ReleaseComObject(stream);
Marshal.ReleaseComObject(channel);
Marshal.ReleaseComObject(ioService);
}
#else
const String dataPrefix = "data:image/png;base64,";
if (!data.StartsWith(dataPrefix))
{
return null;
}
String base64Data = data.Substring(dataPrefix.Length);
Byte[] imageData = Convert.FromBase64String(base64Data);
return imageData;
#endif
}
/// <summary>
/// Get byte array with png image of the current browsers Window.
/// Wpf methods on windows platform don't use a Bitmap :-/
/// Not captures plugin (Flash,etc...) windows
/// </summary>
/// <param name="xOffset"></param>
/// <param name="yOffset"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <returns></returns>
public byte[] CanvasGetPngImage(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(bytes);
}
}
public void TexSubImage2D(UInt32 target, Int32 level, Int32 xoffset, Int32 yoffset, UInt32 format, UInt32 type, nsIDOMHTMLCanvasElement canvas)
{
this.CallVoidMethod("texSubImage2D", target, level, xoffset, yoffset, format, type, canvas);
}
public void TexImage2D(UInt32 target, Int32 level, UInt32 internalformat, UInt32 format, UInt32 type, nsIDOMHTMLCanvasElement canvas)
{
this.CallVoidMethod("texImage2D", target, level, internalformat, format, type, canvas);
}
public GeckoCanvasElement(object element) : base(element as nsIDOMHTMLElement)
{
this.DOMHTMLElement = element as nsIDOMHTMLCanvasElement;
}
internal GeckoCanvasElement(nsIDOMHTMLCanvasElement element) : base(element)
{
this.DOMHTMLElement = element;
}
public GeckoCanvasElement(object element) : base(element as nsIDOMHTMLElement)
{
this.DOMHTMLElement = element as nsIDOMHTMLCanvasElement;
}
internal GeckoCanvasElement(nsIDOMHTMLCanvasElement element) : base(element)
{
this.DOMHTMLElement = element;
}
private static void DrawWindow(nsIDOMHTMLCanvasElement canvasElement, nsIDOMWindow domWindow, Color bgColor, CaptureFlags captureFlags)
{
var context = (nsIDOMCanvasRenderingContext2D)canvasElement.GetContext("2d", JsVal.JSVAL_NULL);
String cssBgColor = String.Format(CssColorFormatInfo.CurrentInfo, "{0:rgba}", bgColor);
context.DrawWindow(domWindow, 0, 0, canvasElement.Width, canvasElement.Height, cssBgColor, (UInt32)captureFlags);
}
