public static ThumbData ReadFromFile(string path)
{
if (!System.IO.File.Exists(path))
{
throw new System.ApplicationException("ファイルが存在していません。");
}
ThumbData ret = new ThumbData();
Bitmap bmp = new Bitmap(path);
ret.width = bmp.Width;
ret.height = bmp.Height;
ret.aspect = ret.width / (float)ret.height;
Bitmap thumb = new Bitmap(bmp.GetThumbnailImage(WIDTH, HEIGHT, delegate(){ return(true); }, System.IntPtr.Zero));
Img::BitmapData bmpdat = thumb.LockBits(rect88, System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
long * d = (long *)ret.px;
long * M = (long *)(ret.px + PIXELS);
long * s = (long *)bmpdat.Scan0;
while (d < M)
{
*d++ = *s++;
}
thumb.UnlockBits(bmpdat);
thumb.Dispose();
bmp.Dispose();
return(ret);
}
/// <summary>
/// サムネイルの内容を更新します。
/// </summary>
public void Update()
{
System.TimeSpan span = new System.IO.FileInfo(filepath).LastWriteTimeUtc - this.lastwrite;
if (span.Ticks / System.TimeSpan.TicksPerSecond <= 2)
{
return;
}
this.data = ThumbData.ReadFromFile(filepath);
this.lastwrite = new System.IO.FileInfo(filepath).LastWriteTimeUtc;
}
//============================================================
// 比較
//============================================================
public static bool EqualAspect(Image img1, Image img2)
{
return(ThumbData.EqualAspect(img1.thm.data, img2.thm.data));
}
public static bool EqualAspect(ThumbData l, ThumbData r)
{
return(System.Math.Abs(l.aspect / r.aspect - 1) <= 0.01);
}