private void RenderMask(ISurface <ColorAlpha8> dstMask, PointInt32 renderOffset)
{
int width = dstMask.Width;
int height = dstMask.Height;
bool flag = false;
SizeInt32 size = new SizeInt32(width, height);
RectInt32 rectangle = new RectInt32(renderOffset, size);
if (!flag && this.matrix.HasInverse)
{
Matrix3x2Double inverse = this.matrix.Inverse;
PointDouble pt = inverse.Transform(rectangle.TopLeft);
PointDouble num7 = inverse.Transform(rectangle.TopRight);
PointDouble num8 = inverse.Transform(rectangle.BottomLeft);
PointDouble num9 = inverse.Transform(rectangle.BottomRight);
RectDouble srcCoverageBounds = this.srcCoverageBounds;
if ((srcCoverageBounds.Contains(pt) && srcCoverageBounds.Contains(num7)) && (srcCoverageBounds.Contains(num8) && srcCoverageBounds.Contains(num9)))
{
dstMask.Clear(ColorAlpha8.Opaque);
flag = true;
}
}
if (!flag)
{
GeometryRelation relation;
IDirect2DFactory perThread = Direct2DFactory.PerThread;
using (IRectangleGeometry geometry = perThread.CreateRectangleGeometry(rectangle))
{
base.ThrowIfCancellationRequested();
using (IRectangleGeometry geometry2 = perThread.CreateRectangleGeometry(this.srcCoverageBounds))
{
base.ThrowIfCancellationRequested();
relation = geometry.CompareWithGeometry(geometry2, new Matrix3x2Float?((Matrix3x2Float)this.matrix), null);
base.ThrowIfCancellationRequested();
}
}
switch (relation)
{
case GeometryRelation.IsContained:
dstMask.Clear(ColorAlpha8.Opaque);
flag = true;
break;
case GeometryRelation.Disjoint:
dstMask.Clear(ColorAlpha8.Transparent);
flag = true;
break;
}
}
if (!flag)
{
using (IDrawingContext context = DrawingContext.FromSurface(dstMask, FactorySource.PerThread))
{
base.ThrowIfCancellationRequested();
context.Clear(null);
context.AntialiasMode = AntialiasMode.PerPrimitive;
using (context.UseTranslateTransform((float)-renderOffset.X, (float)-renderOffset.Y, MatrixMultiplyOrder.Prepend))
{
using (context.UseTransformMultiply((Matrix3x2Float)this.matrix, MatrixMultiplyOrder.Prepend))
{
context.FillRectangle(this.srcCoverageBounds, whiteBrush);
}
}
}
}
}
public static PointDouble Clamp(RectDouble bounds, PointDouble point) => new PointDouble(DoubleUtil.Clamp(point.x, bounds.Left, bounds.Right), DoubleUtil.Clamp(point.y, bounds.Top, bounds.Bottom));