private void ShowHashCommand_Executed(object sender, ExecutedRoutedEventArgs e)
{
const int hashLength = 32; // bits * bits / 8
const string table = "0123456789abcdef";
var hash = new byte[hashLength];
Blockhash.ComputeHash(new Bgr2432InputImage(this._screenImage), hash);
var s = new string('\0', hashLength * 2);
unsafe
{
fixed(char *c = s)
{
for (var i = 0; i < hashLength; i++)
{
c[i * 2] = table[hash[i] >> 4];
c[i * 2 + 1] = table[hash[i] & 0xf];
}
}
}
Clipboard.SetText(s);
MessageBox.Show(this, s, "画像ハッシュ");
}
/// <summary>
/// スクリーンショットを撮影し、最も近い選択肢画面を返す
/// </summary>
/// <returns>
/// 閾値より距離の小さい選択肢画面が見つかった場合、その <see cref="SelectionInfo"/> と、距離を返します。
/// 見つからなかった場合、 null と、見つかった中での最短距離を返します。
/// </returns>
private async Task <(SelectionInfo, int)> GetMostSimilarSelectionAsync()
{
// ハミング距離の閾値
// 各々の最短距離より十分に小さいので、距離がこれ以下のものがあれば、それを返す
const int threshold = 10;
var arrayPool = ArrayPool <byte> .Shared;
var hashArray = arrayPool.Rent(32);
var hash = new ArraySegment <byte>(hashArray, 0, 32);
var minDistance = int.MaxValue;
try
{
using (var screenshot = await this._wagahighOperator.CaptureContentAsync().ConfigureAwait(false))
{
Blockhash.ComputeHash(new Bgr2432InputImage(screenshot), hash);
}
foreach (var si in SelectionInfo.Selections)
{
var distance = Blockhash.GetDistance(hash, si.ScreenshotHash);
if (distance <= threshold)
{
return(si, distance);
}
if (distance < minDistance)
{
minDistance = distance;
}
}
}
finally
{
arrayPool.Return(hashArray);
}
return(null, minDistance);
}
private int OnExecute()
{
var hashLength = this.Bits * this.Bits / 8;
var inputLength = this.InputFiles.Length;
var results = new byte[hashLength * inputLength];
// 順番にハッシュを計算
var successAll = true;
for (var i = 0; i < this.InputFiles.Length; i++)
{
try
{
var span = new Span <byte>(results, hashLength * i, hashLength);
using (var image = Image.Load(this.InputFiles[i]))
{
Blockhash.ComputeHash(new Rgba32InputImage(image), span, this.Bits);
}
Console.WriteLine("{0}: {1}", i, ToHashString(span));
}
catch (Exception ex)
{
if (Debugger.IsAttached)
{
Debugger.Break();
}
Console.Error.WriteLine("{0}: {1}", i, ex);
successAll = false;
}
}
if (!successAll)
{
return(1);
}
// 最短距離を計算
if (inputLength > 1)
{
var minDistance = int.MaxValue;
for (var i = 0; i < inputLength; i++)
{
for (var j = 0; j < inputLength; j++)
{
if (i == j)
{
continue;
}
var bs1 = new ArraySegment <byte>(results, hashLength * i, hashLength);
var bs2 = new ArraySegment <byte>(results, hashLength * j, hashLength);
var distance = Blockhash.GetDistance(bs1, bs2);
if (distance < minDistance)
{
minDistance = distance;
}
}
}
Console.WriteLine("Min Distance: {0}", minDistance);
}
return(0);
}