/// <summary>
/// Tries to get the physical render target size and returns it converted to virtual space.
/// </summary>
/// <param name="dc"></param>
/// <param name="camera"></param>
/// <returns></returns>
public static bool TryGetOuterCamera(ICoreCanvas2D dc, out CameraTransform2D camera)
{
camera = default;
if (!TryGetRenderTargetInfo(dc, out var vinfo))
{
return(false);
}
if (vinfo == null)
{
return(false);
}
var w = vinfo.PixelsWidth;
var h = vinfo.PixelsHeight;
if (w <= 0 || h <= 0)
{
return(false);
}
// query for any in between transformations
if (dc is ITransformer2D xform)
{
// transform points from physical screen space to virtual space
Span <Point2> points = stackalloc Point2[3];
points[0] = (0, 0);
points[1] = (w, 0);
points[2] = (0, h);
xform.TransformInverse(points);
// create matrix from points
var dx = Point2.Normalize(points[1] - points[0], out var ww);
var dy = Point2.Normalize(points[2] - points[0], out var hh);
var m = new Matrix3x2(dx.X, dx.Y, dy.X, dy.Y, points[0].X, points[0].Y);
// create camera
camera = new CameraTransform2D(m, new Vector2(ww, hh), false);
}
else
{
camera = Create(Matrix3x2.Identity, new Vector2(w, h));
}
return(true);
}
