public static Bitmap FromFile(string filename)
{
if (string.IsNullOrEmpty(filename))
{
return(null);
}
if (FileOperations.FileExists(filename))
{
if (FileOperations.FileExtensionIs(filename, ".png"))
{
int w = 0;
int h = 0;
IntPtr ppvBits;
IntPtr hBitmap = NativeMethods.LoadBitmapPNG(filename, ref w, ref h, out ppvBits);
if (hBitmap != IntPtr.Zero)
{
Bitmap result = new Bitmap(w, h, PixelFormat.Format32bppArgb);
BitmapData data = result.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
NativeMethods.RtlMoveMemory(data.Scan0, ppvBits, h * data.Stride); // copies the bitmap
result.UnlockBits(data);
NativeMethods.DeleteObject(hBitmap);
result = BitmapPainter.ConvertTo32Bit(result, true);
return(result);
}
}
if (FileOperations.FileExtensionIs(filename, ".jpg") || FileOperations.FileExtensionIs(filename, ".jpeg"))
{
int w = 0;
int h = 0;
IntPtr ppvBits;
IntPtr hBitmap = NativeMethods.LoadBitmapJPG(filename, ref w, ref h, out ppvBits);
if (hBitmap != IntPtr.Zero)
{
Bitmap result = new Bitmap(w, h, PixelFormat.Format24bppRgb);
BitmapData data = result.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
NativeMethods.RtlMoveMemory(data.Scan0, ppvBits, h * data.Stride); // copies the bitmap
result.UnlockBits(data);
NativeMethods.DeleteObject(hBitmap);
Bitmap realResult = BitmapPainter.ConvertTo32Bit(result, true);
return(realResult);
}
}
if (FileOperations.FileExtensionIs(filename, ".ico"))
{
Icon icon = new Icon(FileOperations.StripFileName(filename));
Bitmap result = icon.ToBitmap();
icon.Dispose();
return(result);
}
Bitmap image = null;
IntPtr zero = IntPtr.Zero;
int imageType;
if (NativeMethods.GdipLoadImageFromFile(FileOperations.StripFileName(filename), out zero) != 0)
{
return(null);
}
if (NativeMethods.GdipGetImageType(zero, out imageType) != 0)
{
return(null);
}
if (imageType == 1)
{
image = (Bitmap)typeof(System.Drawing.Bitmap).InvokeMember("FromGDIplus", BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.InvokeMethod, null, null, new object[] { zero });
}
if (!NativeMethods.IsAnimatedGIF(filename))
{
image = BitmapPainter.ConvertTo32Bit(image, true);
}
return(image);
}
else
{
return(null);
}
}