/// <summary>
/// Apply an opacity mask based on the alpha values of a brush.
/// </summary>
public void ApplyOpacityMask(Brush brush)
{
if (brush == null)
{
return;
}
Color[,] colors = TextureGenerator.RenderBrushToColorArray(brush, width, height);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
double opacity = ColorOperations.ByteToDouble(colors[x, y].A);
frameBuffer[x, y] = ColorOperations.PreMultipliedOpacityScale(frameBuffer[x, y], opacity);
}
}
}
/// <summary>
/// Clip the regions specified by the Geometry out of the frame buffer.
/// </summary>
public void ApplyClip(Geometry clip)
{
if (clip == null)
{
return;
}
Color[,] clipColors = TextureGenerator.RenderBrushToColorArray(GetClipBrush(clip), width, height);
// Clipping is anti-aliased. Need tolerance around clip edges.
Color[,] tolColors = TextureGenerator.RenderBrushToColorArray(GetClipTolerance(clip), width, height);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
double opacity = ColorOperations.ByteToDouble(clipColors[x, y].A);
frameBuffer[x, y] = ColorOperations.PreMultipliedOpacityScale(frameBuffer[x, y], opacity);
Color tolerance = new Color();
tolerance.A = tolerance.R = tolerance.G = tolerance.B = tolColors[x, y].A;
toleranceBuffer[x, y] = ColorOperations.Add(toleranceBuffer[x, y], tolerance);
}
}
}