internal static GlowBitmap Create(GlowDrawingContext drawingContext, GlowBitmapPart bitmapPart, Color color)
{
var orCreateAlphaMask =
GetOrCreateAlphaMask(bitmapPart);
var glowBitmap =
new GlowBitmap(
drawingContext.ScreenDC,
orCreateAlphaMask.Width,
orCreateAlphaMask.Height);
for (var i = 0; i < orCreateAlphaMask.DIBits.Length; i += BytesPerPixelBgra32)
{
var b = orCreateAlphaMask.DIBits[i + 3];
var val = PremultiplyAlpha(color.R, b);
var val2 = PremultiplyAlpha(color.G, b);
var val3 = PremultiplyAlpha(color.B, b);
Marshal.WriteByte(glowBitmap.DIBits, i, val3);
Marshal.WriteByte(glowBitmap.DIBits, i + 1, val2);
Marshal.WriteByte(glowBitmap.DIBits, i + 2, val);
Marshal.WriteByte(glowBitmap.DIBits, i + 3, b);
}
return(glowBitmap);
}
internal GlowDrawingContext(int width, int height)
{
ScreenDC = InteropMethods.GetDC(IntPtr.Zero);
if (ScreenDC == IntPtr.Zero)
{
return;
}
WindowDC = InteropMethods.CreateCompatibleDC(ScreenDC);
if (WindowDC == IntPtr.Zero)
{
return;
}
BackgroundDC = InteropMethods.CreateCompatibleDC(ScreenDC);
if (BackgroundDC == IntPtr.Zero)
{
return;
}
Blend.BlendOp = 0;
Blend.BlendFlags = 0;
Blend.SourceConstantAlpha = 255;
Blend.AlphaFormat = 1;
_windowBitmap = new GlowBitmap(ScreenDC, width, height);
InteropMethods.SelectObject(WindowDC, _windowBitmap.Handle);
}
