public static unsafe void DrawCorner(FrameData.Section s, byte *dest, int destX, int destY, int destStride)
{
var src = (byte *)s.Pixels.ToPointer();
int srcStride = s.Width * s.BytesPerPixel;
for (int y = 0; y < s.Height; y++)
{
for (int x = 0; x < s.Width; x++)
{
for (int i = 0; i < s.BytesPerPixel; i++)
{
dest[(y + destY) * destStride + (x + destX) * s.BytesPerPixel + i]
= src[y * srcStride + x * s.BytesPerPixel + i];
}
}
}
}
public static unsafe void DrawVerticalSide(FrameData.Section s, byte *dest, int destXStart, int destYStart, int writeHeight, int destStride)
{
var src = (byte *)s.Pixels.ToPointer();
int srcStride = s.Width * s.BytesPerPixel;
if (s.Repeating)
{
int repeatCount = (writeHeight + s.Height - 1) / s.Height;
var interp = new SimpleResampler(s.Height * repeatCount, writeHeight);
int prevDestIndex = 0;
var averager = new PixelAverager(s.BytesPerPixel);
for (int y = 0; y < s.Height * repeatCount; y++)
{
int destY = interp.Map(y);
for (int x = 0; x < s.Width; x++)
{
int destIndex = (x + destXStart) * s.BytesPerPixel + (destY + destYStart) * destStride;
if (prevDestIndex != destIndex && averager.Count != 0)
{
averager.WriteAverage(dest + prevDestIndex);
}
prevDestIndex = destIndex;
averager.Add(src + (y % s.Height) * srcStride + x * s.BytesPerPixel);
}
averager.WriteAverage(dest + prevDestIndex);
}
}
else if (writeHeight > s.Height)
{
var extrapolater = new FastUpsampler(s.Height, writeHeight);
for (int y = 0; y < writeHeight; y++)
{
extrapolater.Map(y, out int sampleYa, out int sampleYb);
for (int x = 0; x < s.Width; x++)
{
for (int i = 0; i < s.BytesPerPixel; i++)
{
dest[(y + destYStart) * destStride + (x + destXStart) * s.BytesPerPixel + i] = (byte)((
src[sampleYa * srcStride + x * s.BytesPerPixel + i] +
src[sampleYb * srcStride + x * s.BytesPerPixel + i]) / 2);
}
}
}
}
else
{
var interp = new SimpleResampler(s.Height, writeHeight);
int prevDestIndex = 0;
var averager = new PixelAverager(s.BytesPerPixel);
for (int y = 0; y < s.Height; y++)
{
int destY = interp.Map(y);
for (int x = 0; x < s.Width; x++)
{
int destIndex = (x + destXStart) * s.BytesPerPixel + (destY + destYStart) * destStride;
if (prevDestIndex != destIndex && averager.Count != 0)
{
averager.WriteAverage(dest + prevDestIndex);
}
prevDestIndex = destIndex;
averager.Add(src + y * srcStride + x * s.BytesPerPixel);
}
averager.WriteAverage(dest + prevDestIndex);
}
}
}