private static unsafe void PaintYuvFrame(Yuv444Frame yuv444Frame, StencilFrame stencilFrame,
int startX, int startY, int width, int height)
{
var yPtr = (byte *)stencilFrame.YPtr.ToPointer();
var uPtr = (byte *)stencilFrame.UPtr.ToPointer();
var vPtr = (byte *)stencilFrame.VPtr.ToPointer();
var alphaPtr = (byte *)stencilFrame.AlphaPtr.ToPointer();
for (var y = startY; y < startY + height; y += 1)
{
for (var x = startX; x < startX + width; x += 1)
{
var pixelIndex = stencilFrame.Width * y + x;
if (alphaPtr[pixelIndex] <= 0 || yuv444Frame.ColoredBytes[pixelIndex])
{
continue;
}
var stencilChromaIndex = (stencilFrame.Width / 2) * (y / 2) + (x / 2);
yuv444Frame.YBytes[pixelIndex] = yPtr[pixelIndex];
yuv444Frame.UBytes[pixelIndex] = uPtr[stencilChromaIndex];
yuv444Frame.VBytes[pixelIndex] = vPtr[stencilChromaIndex];
yuv444Frame.ColoredBytes[pixelIndex] = true;
}
}
}
public static Yuv444Frame PaintYuvFrame(int width, int height, StencilFrame[] stencilFrames)
{
var resultYuv444 = new Yuv444Frame(width, height);
foreach (var stencilFrame in stencilFrames)
{
PaintYuvFrame(resultYuv444, stencilFrame);
}
return(resultYuv444);
}
private static void PaintYuvFrame(Yuv444Frame yuv444Frame, StencilFrame stencilFrame)
{
for (var maskYIndex = 0; maskYIndex < 2; maskYIndex += 1)
{
for (var maskXIndex = 0; maskXIndex < 4; maskXIndex += 1)
{
var maskIndex = maskYIndex * 4 + maskXIndex;
var maskValue = stencilFrame.MaskTree & (1 << maskIndex);
var isPassed = maskValue == 0;
if (isPassed)
{
continue;
}
var startX = maskXIndex * stencilFrame.Width / 4;
var startY = maskYIndex * stencilFrame.Height / 2;
var width = stencilFrame.Width / 4;
var height = stencilFrame.Height / 2;
PaintYuvFrame(yuv444Frame, stencilFrame, startX, startY, width, height);
}
}
}
