public static RectInt32 FromPoints(PointInt32 a, PointInt32 b)
{
int left = Math.Min(a.X, b.X);
int top = Math.Min(a.Y, b.Y);
int right = Math.Max(a.X, b.X);
int bottom = Math.Max(a.Y, b.Y);
return(RectInt32.FromEdges(left, top, right, bottom));
}
public unsafe void Render(ISurfaceAllocator <ColorAlpha8> allocator, int dstWidth, int dstHeight, PointInt32 renderOffset, ref ISurface <ColorAlpha8> dst, out int?fill255Count)
{
int stride;
if ((allocator == null) && (dst == null))
{
throw new ArgumentException();
}
if (dst != null)
{
dst.Clear(ColorAlpha8.Transparent);
}
int x = renderOffset.X;
int y = renderOffset.Y;
int right = renderOffset.X + dstWidth;
int bottom = renderOffset.Y + dstHeight;
RectInt32 a = RectInt32.FromEdges(x, y, right, bottom);
int count = this.scans.Count;
int scansStartIndex = this.GetScansStartIndex(y, bottom);
Label_006C:
stride = -1;
byte *numPtr = null;
if (dst != null)
{
stride = dst.Stride;
numPtr = (byte *)dst.Scan0;
}
int num9 = 0;
for (int i = scansStartIndex; i < count; i++)
{
RectInt32 scanAt = this.GetScanAt(i);
if (scanAt.Y >= bottom)
{
break;
}
int left = Math.Max(x, scanAt.X);
int top = Math.Max(y, scanAt.Y);
int num14 = Math.Min(right, scanAt.X + scanAt.Width);
int num15 = Math.Min(bottom, scanAt.Y + scanAt.Height);
RectInt32 b = RectInt32.FromEdges(left, top, num14, num15);
if (RectInt32.Intersect(a, b).HasPositiveArea)
{
uint num18 = (uint)(num14 - left);
int num19 = left - renderOffset.X;
int num20 = num14 - renderOffset.X;
if (dst == null)
{
num9 += (int)((num15 - top) * num18);
}
else
{
byte *prgBuffer = numPtr + ((byte *)(((top - renderOffset.Y) * stride) + num19));
for (int j = top; j < num15; j++)
{
Memory.FillMemory(prgBuffer, 0xff, (ulong)num18);
prgBuffer += stride;
}
}
}
}
if (((dst != null) || (num9 == 0)) || (num9 == (dstWidth * dstHeight)))
{
if (dst == null)
{
fill255Count = new int?(num9);
}
else
{
fill255Count = 0;
}
}
else
{
dst = allocator.Allocate(dstWidth, dstHeight, AllocationOptions.Default);
goto Label_006C;
}
}