private void OnGUI()
{
var newLog10 = GUILayout.SelectionGrid(_log10, _algorithmButtons, 2, EditorStyles.miniButtonMid);
if (newLog10 != _log10)
{
_log10 = newLog10;
_histogramData = CalculateHistogram(_pixels, 256);
_histogramTexture = null;
}
_selection = GUILayout.SelectionGrid(_selection, _buttons, 5, EditorStyles.miniButtonMid);
var rect = EditorGUILayout.GetControlRect(GUILayout.ExpandWidth(true), GUILayout.ExpandHeight(true));
if ((_histogramTexture == null || _histogramTexture[_selection] == null) && _histogramData != null)
{
if (_histogramTexture == null)
{
_histogramTexture = new Texture2D[5];
}
_histogramTexture[_selection] = GenerateTexture(256, 256, _histogramData, _selection == 0 || _selection == 1, _selection == 0 || _selection == 2, _selection == 0 || _selection == 3, _selection == 4);
}
else if (_histogramTexture == null && _histogramData == null)
{
GUILayout.Label("select texture");
}
else if (_histogramTexture != null && _histogramTexture[_selection] != null)
{
EditorGUI.DrawTextureTransparent(rect, _histogramTexture[_selection]);
}
}
private HistogramRawData CalculateHistogram(Color32[] pixels, int height)
{
var length = pixels.Length;
var r = new long[256];
var g = new long[256];
var b = new long[256];
var a = new long[256];
foreach (var pixel in pixels)
{
r[pixel.r] = r[pixel.r] + 1;
g[pixel.g] = g[pixel.g] + 1;
b[pixel.b] = b[pixel.b] + 1;
a[pixel.a] = a[pixel.a] + 1;
}
var rTotal = 0.0;
var gTotal = 0.0;
var bTotal = 0.0;
var aTotal = 0.0;
for (var i = 0; i < 256; i++)
{
rTotal = Math.Max(rTotal, r[i]);
gTotal = Math.Max(gTotal, g[i]);
bTotal = Math.Max(bTotal, b[i]);
aTotal = Math.Max(aTotal, a[i]);
}
if (_log10 == 1)
{
rTotal = Math.Log10(rTotal);
gTotal = Math.Log10(gTotal);
bTotal = Math.Log10(bTotal);
aTotal = Math.Log10(aTotal);
}
var rawData = new HistogramRawData();
for (var i = 0; i < 256; i++)
{
var rd = _log10 == 1 ? Math.Log10(r[i]) : r[i];
var gd = _log10 == 1 ? Math.Log10(g[i]) : g[i];
var bd = _log10 == 1 ? Math.Log10(b[i]) : b[i];
var ad = _log10 == 1 ? Math.Log10(a[i]) : a[i];
rawData.R[i] = rd / rTotal;
rawData.G[i] = gd / gTotal;
rawData.B[i] = bd / bTotal;
rawData.A[i] = ad / aTotal;
}
return(rawData);
}
private Texture2D GenerateTexture(int width, int height, HistogramRawData rawData, bool r, bool g, bool b, bool a)
{
var texture = new Texture2D(width, height);
for (var i = 0; i < rawData.R.Length; i++)
{
for (var y = 0; y < height; y++)
{
texture.SetPixel(i, y, new Color(.1f, .1f, .1f, 1));
}
if (r)
{
var size = (int)(rawData.R[i] * height);
for (var y = 0; y < size; y++)
{
var pixel = texture.GetPixel(i, y);
pixel.r = 1;
pixel.a = 1;
texture.SetPixel(i, y, pixel);
}
}
if (g)
{
var size = (int)(rawData.G[i] * height);
for (var y = 0; y < size; y++)
{
var pixel = texture.GetPixel(i, y);
pixel.g = 1;
pixel.a = 1;
texture.SetPixel(i, y, pixel);
}
}
if (b)
{
var size = (int)(rawData.B[i] * height);
for (var y = 0; y < size; y++)
{
var pixel = texture.GetPixel(i, y);
pixel.b = 1;
pixel.a = 1;
texture.SetPixel(i, y, pixel);
}
}
if (a)
{
var size = (int)(rawData.A[i] * height);
for (var y = 0; y < size; y++)
{
var pixel = texture.GetPixel(i, y);
pixel.r = pixel.a;
pixel.g = pixel.a;
pixel.b = pixel.a;
pixel.a = 1;
texture.SetPixel(i, y, pixel);
}
}
}
texture.Apply();
return(texture);
}