/// <summary>
/// BeforeRender - Make sure we have a Graphics object to render to.
/// If we don't have one, then create one to match the SvgWindow's
/// physical dimensions.
/// </summary>
private void RendererBeforeRender()
{
// Testing for null here allows "advanced" developers to create their own Graphics object for rendering
if (_graphics == null)
{
// Get the current SVGWindow's width and height
int innerWidth = (int)_svgWindow.InnerWidth;
int innerHeight = (int)_svgWindow.InnerHeight;
// Make sure we have an actual area to render to
if (innerWidth > 0 && innerHeight > 0)
{
// See if we already have a rasterImage that matches the current SVGWindow dimensions
if (_rasterImage == null || _rasterImage.Width != innerWidth || _rasterImage.Height != innerHeight)
{
// Nope, so create one
if (_rasterImage != null)
{
_rasterImage.Dispose();
_rasterImage = null;
}
_rasterImage = new Bitmap(innerWidth, innerHeight);
}
// Make a GraphicsWrapper object from the rasterImage and clear it to the background color
// _graphics = GdiGraphicsWrapper.FromImage(_rasterImage, _isStatic);
_graphics = GdiGraphicsImpl.FromImage(_rasterImage, _isStatic);
_graphics.Clear(_backColor);
_hitTestHelper = _graphics.HitTestHelper;
}
}
}
/// <summary>
/// AfterRender - Dispose of Graphics object created for rendering.
/// </summary>
private void OnAfterRender()
{
if (_ownsGraphics)
{
if (_graphics != null)
{
if (_hitTestHelper != null)
{
if (_hitTestHelper != _graphics.HitTestHelper)
{
_hitTestHelper.Dispose();
_hitTestHelper = _graphics.HitTestHelper;
}
}
_graphics.HitTestHelper = GdiHitTestHelper.NoHit; // Prevent disposal actual height test
_graphics.Dispose();
_graphics = null;
}
}
if (_hitTestHelper == null)
{
_hitTestHelper = GdiHitTestHelper.NoHit;
}
}
/// <summary>
/// Initializes a new instance of the GdiRenderer class.
/// </summary>
public GdiGraphicsRenderer(bool isStatic = false, bool disposeRaster = true)
{
_isStatic = isStatic;
_disposeRaster = disposeRaster;
_invalidRect = SvgRectF.Empty;
_backColor = Color.White;
_hitTestHelper = GdiHitTestHelper.NoHit;
_svgRenderer = new GdiRenderingHelper(this);
}
protected override void Dispose(bool disposing)
{
if (_hitTestHelper != null)
{
_hitTestHelper.Dispose();
}
_hitTestHelper = null;
base.Dispose(disposing);
}
private void Dispose(bool disposing)
{
if (_hitTestHelper != null)
{
_hitTestHelper.Dispose();
}
if (_disposeRaster && _rasterImage != null)
{
_rasterImage.Dispose();
}
if (_graphics != null)
{
_graphics.Dispose();
}
_graphics = null;
_rasterImage = null;
_hitTestHelper = null;
}
public void ClearAll()
{
if (_graphics != null)
{
_graphics.Dispose();
_graphics = null;
}
if (_rasterImage != null)
{
_rasterImage.Dispose();
_rasterImage = null;
}
if (_hitTestHelper != null)
{
_hitTestHelper.Dispose();
_hitTestHelper = null;
}
_hitTestHelper = GdiHitTestHelper.NoHit;
}