// Compute a fixed color from a source and a target alpha
public static Color Blend(this IRecieveBlenderByte blender, Color start, Color blend)
{
var result = new byte[] { start.blue, start.green, start.red, start.alpha };
blender.BlendPixel(result, 0, blend);
return(new Color(result[2], result[1], result[0], result[3]));
}
public void blend_hline(int x1, int y, int x2, RGBA_Bytes sourceColor, byte cover)
{
if (sourceColor.alpha != 0)
{
int len = x2 - x1 + 1;
int bufferOffset;
byte[] buffer = GetPixelPointerXY(x1, y, out bufferOffset);
int alpha = (((int)(sourceColor.alpha) * (cover + 1)) >> 8);
if (alpha == base_mask)
{
recieveBlender.CopyPixels(buffer, bufferOffset, sourceColor, len);
}
else
{
do
{
recieveBlender.BlendPixel(buffer, bufferOffset, new RGBA_Bytes(sourceColor.red, sourceColor.green, sourceColor.blue, alpha));
bufferOffset += m_DistanceInBytesBetweenPixelsInclusive;
}while (--len != 0);
}
}
}
public static void BasedOnAlpha(IRecieveBlenderByte recieveBlender, byte[] destBuffer, int bufferOffset, RGBA_Bytes sourceColor)
{
//if (sourceColor.m_A != 0)
{
#if false // we blend regardless of the alpha so that we can get Light Opacity working (used this way we have addative and faster blending in one blender) LBB
if (sourceColor.m_A == base_mask)
{
Blender.CopyPixel(pDestBuffer, sourceColor);
}
else
#endif
{
recieveBlender.BlendPixel(destBuffer, bufferOffset, sourceColor);
}
}
}
public static void BasedOnAlphaAndCover(IRecieveBlenderByte recieveBlender, byte[] destBuffer, int bufferOffset, RGBA_Bytes sourceColor, int cover)
{
if (cover == 255)
{
BasedOnAlpha(recieveBlender, destBuffer, bufferOffset, sourceColor);
}
else
{
//if (sourceColor.m_A != 0)
{
sourceColor.alpha = (byte)((sourceColor.alpha * (cover + 1)) >> 8);
#if false // we blend regardless of the alpha so that we can get Light Opacity working (used this way we have additive and faster blending in one blender) LBB
if (sourceColor.m_A == base_mask)
{
Blender.CopyPixel(pDestBuffer, sourceColor);
}
else
#endif
{
recieveBlender.BlendPixel(destBuffer, bufferOffset, sourceColor);
}
}
}
}