/// <summary>
/// Attempts to generate a transparency key from an r,g,b byte color.
/// </summary>
/// <param name="r">Red component</param>
/// <param name="g">Green component</param>
/// <param name="b">Blue component</param>
/// <returns></returns>
internal static DDCOLORKEY GenerateColorKey(byte r, byte g, byte b)
{
// This may not be perfect since we are going to have to average
// different bit depths together
var ddck = new DDCOLORKEY();
var ddsd2 = new DDSURFACEDESC2();
((DirectX7GraphicsEngine)(GraphicsEngine.Current)).DirectDraw.GetDisplayMode(ref ddsd2);
var bBitCount = CountBits(ddsd2.ddpfPixelFormat.lBBitMask);
var gBitCount = CountBits(ddsd2.ddpfPixelFormat.lGBitMask);
var rBitCount = CountBits(ddsd2.ddpfPixelFormat.lRBitMask);
var bBitMask = ddsd2.ddpfPixelFormat.lBBitMask;
var gBitMask = ddsd2.ddpfPixelFormat.lGBitMask >> bBitCount;
var rBitMask = ddsd2.ddpfPixelFormat.lRBitMask >> (gBitCount + bBitCount);
var bValue = (b / 255) * bBitMask;
var gValue = (g / 255) * gBitMask;
var rValue = (r / 255) * rBitMask;
ddck.low = (rValue << (gBitCount + bBitCount)) + (gValue << bBitCount) + bValue;
ddck.high = ddck.low;
return(ddck);
}
/// <summary>
/// Attempts to generate a transparency key from an r,g,b byte color.
/// </summary>
/// <param name="r">Red component</param>
/// <param name="g">Green component</param>
/// <param name="b">Blue component</param>
/// <returns></returns>
public static DDCOLORKEY GenerateColorKey(byte r, byte g, byte b)
{
// This may not be perfect since we are going to have to average
// different bit depths together
var ddck = new DDCOLORKEY();
var ddsd2 = new DDSURFACEDESC2();
ManagedDirectX.DirectDraw.GetDisplayMode(ref ddsd2);
var bBitCount = CountBits(ddsd2.ddpfPixelFormat.lBBitMask);
var gBitCount = CountBits(ddsd2.ddpfPixelFormat.lGBitMask);
var rBitCount = CountBits(ddsd2.ddpfPixelFormat.lRBitMask);
var bBitMask = ddsd2.ddpfPixelFormat.lBBitMask;
var gBitMask = ddsd2.ddpfPixelFormat.lGBitMask >> bBitCount;
var rBitMask = ddsd2.ddpfPixelFormat.lRBitMask >> (gBitCount + bBitCount);
var bValue = (b/255)*bBitMask;
var gValue = (g/255)*gBitMask;
var rValue = (r/255)*rBitMask;
ddck.low = (rValue << (gBitCount + bBitCount)) + (gValue << bBitCount) + bValue;
ddck.high = ddck.low;
return ddck;
}
internal ColorKey(DDCOLORKEY key)
{
High = key.high;
Low = key.low;
}
internal ColorKey(DDCOLORKEY key)
{
High = key.high;
Low = key.low;
}
