private void RenderAlphaBar()
{
_boxA.Lock();
var buf = _boxA.Buffer;
int w = _boxA.Width;
int h = _boxA.Height;
var info = new AlphaPixel(
(w + 1) / 2,
Utils.AlphaShades,
_chn[0],
_chn[1],
_chn[2],
1f
);
for (int i = 0; i < buf.Length; i += 4)
{
int idx = i / 4;
info.alpha = 1f - (float)(idx / w) / (float)h;
RenderAlphaPixel(info, buf, w, h, idx);
}
_boxA.Unlock();
}
private void RenderSampleBox()
{
_boxSample.Lock();
var buf = _boxSample.Buffer;
int w = _boxSample.Width;
int h = _boxSample.Height;
var info = new AlphaPixel(
w / 8,
Utils.AlphaShades,
_chn[0],
_chn[1],
_chn[2],
_chn[3]
);
for (int idx = 0; idx < buf.Length / 4; idx++)
{
RenderAlphaPixel(info, buf, w, h, idx);
}
_boxSample.Unlock();
}
//[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static void RenderAlphaPixel(AlphaPixel info, byte[] buf, int w, int h, int idx)
{
const int frame = ColorBox.Border;
int x = idx % w;
int y = idx / w;
int xOdd = (x / info.blockSize) % 2;
int yOdd = (y / info.blockSize) % 2;
float shade = info.shades[xOdd ^ yOdd];
float lum = 255f;
if (x < frame || x >= w - frame || y < frame || y >= h - frame)
{
lum = 255f * dimmed;
}
int i = idx * 4;
buf[i + (int)BGRA.Blue] = (byte)((shade + (info.blue - shade) * info.alpha) * lum);
buf[i + (int)BGRA.Green] = (byte)((shade + (info.green - shade) * info.alpha) * lum);
buf[i + (int)BGRA.Red] = (byte)((shade + (info.red - shade) * info.alpha) * lum);
buf[i + (int)BGRA.Alpha] = 255;
}
