private static CachedBitmapInfo GetOrCreateAlphaMask(GlowBitmapPart bitmapPart)
{
if (_transparencyMasks[(int)bitmapPart] == null)
{
var bitmapImage = new BitmapImage(new Uri($"pack://application:,,,/HandyControl;Component/Resources/Images/GlowWindow/{bitmapPart}.png"));
var array = new byte[BytesPerPixelBgra32 * bitmapImage.PixelWidth * bitmapImage.PixelHeight];
var stride = BytesPerPixelBgra32 * bitmapImage.PixelWidth;
bitmapImage.CopyPixels(array, stride, 0);
_transparencyMasks[(int)bitmapPart] =
new CachedBitmapInfo(
array,
bitmapImage.PixelWidth,
bitmapImage.PixelHeight);
}
return(_transparencyMasks[(int)bitmapPart]);
}
/// <summary>
/// 工厂方法：用设定的颜色和位置创建一个 GlowBitmap 对象。
/// </summary>
/// <param name="drawingContext"></param>
/// <param name="bitmapPart"></param>
/// <param name="color"></param>
/// <returns></returns>
public static GlowEdgeBitmap Create(GlowEdgeDrawingContext dc, GlowEdgeBitmapParts part, Color color)
{
CachedBitmapInfo mast = GetOrCreateAlphaMast(part);
GlowEdgeBitmap glowEdgeBitmap = new GlowEdgeBitmap(dc.ScreenDC, mast.Width, mast.Height);
// 创建数据
for (int i = 0; i < mast.DIBits.Length; i += BytesPerPixelBgra32)
{
byte a = mast.DIBits[i + 3];
byte r = PremultiplyAlpha(color.R, a);
byte g = PremultiplyAlpha(color.G, a);
byte b = PremultiplyAlpha(color.B, a);
Marshal.WriteByte(glowEdgeBitmap.DIBits, i, b);
Marshal.WriteByte(glowEdgeBitmap.DIBits, i + 1, g);
Marshal.WriteByte(glowEdgeBitmap.DIBits, i + 2, r);
Marshal.WriteByte(glowEdgeBitmap.DIBits, i + 3, a);
}
return(glowEdgeBitmap);
}
/// <summary>
/// 读取图片的 Alpha 通道作为阴影的 Alpha 通道
/// </summary>
/// <param name="part"></param>
/// <returns></returns>
private static CachedBitmapInfo GetOrCreateAlphaMast(GlowEdgeBitmapParts part)
{
int index = (int)part;
if (_transparencyMasks[index] == null)
{
BitmapImage mastImage =
new BitmapImage(
new Uri($"pack://application:,,,/WindowCustomizeTest;Component/GlowWindowCore/Resource/{part}.png" /*, UriKind.Relative*/));
byte[] pixels = new byte[BytesPerPixelBgra32 * mastImage.PixelWidth * mastImage.PixelHeight];
int stride = BytesPerPixelBgra32 * mastImage.PixelWidth;
mastImage.CopyPixels(pixels, stride, 0);
mastImage.Freeze();
_transparencyMasks[index] =
new CachedBitmapInfo(pixels, mastImage.PixelWidth, mastImage.PixelHeight);
}
return(_transparencyMasks[index]);
}
private static void CreateAlphaMask()
{
// run once
if (alphaMasks[0] != null)
{
return;
}
string assembly = typeof(GlowBitmap).Assembly.GetName().Name;
for (int i = 0; i < 12; i++)
{
string path = String.Format("Images/{0}.png", (BitmapPart)i);
var uri = new Uri(String.Format("pack://application:,,,/{0};component/{1}", assembly, path), UriKind.Absolute);
var bitmapImage = new BitmapImage(uri);
byte[] array = new byte[4 * bitmapImage.PixelWidth * bitmapImage.PixelHeight];
int stride = 4 * bitmapImage.PixelWidth;
bitmapImage.CopyPixels(array, stride, 0);
alphaMasks[i] = new CachedBitmapInfo(array, bitmapImage.PixelWidth, bitmapImage.PixelHeight);
}
}
} // ctor
public static GlowBitmap FromImage(int imagePos, Color color)
{
CreateAlphaMask();
CachedBitmapInfo alphaMask = alphaMasks[imagePos];
IntPtr hdc = NativeMethods.GetDC(IntPtr.Zero);
var glowBitmap = new GlowBitmap(hdc, alphaMask.Width, alphaMask.Height);
for (int i = 0; i < alphaMask.DIBits.Length; i += 4)
{
byte alpha = alphaMask.DIBits[i + 3];
byte red = (byte)((double)(color.R * alpha) / 255.0);
byte green = (byte)((double)(color.G * alpha) / 255.0);
byte blue = (byte)((double)(color.B * alpha) / 255.0);
Marshal.WriteByte(glowBitmap.DIBits, i, blue);
Marshal.WriteByte(glowBitmap.DIBits, i + 1, green);
Marshal.WriteByte(glowBitmap.DIBits, i + 2, red);
Marshal.WriteByte(glowBitmap.DIBits, i + 3, alpha);
}
NativeMethods.ReleaseDC(IntPtr.Zero, hdc);
return(glowBitmap);
} // ctor static
