void CompressTo16Bit(Texture2D texture, string path)
{
var t0 = Time.realtimeSinceStartup;
var pixels = texture.GetPixels32(0);
// アルファチャネルを使っているか調べる
bool hasAlpha = true;
if (texture.format == TextureFormat.RGB24)
{
hasAlpha = false;
}
else
{
for (int i = 0; i < pixels.Length; i++)
{
if (pixels[i].a != 255)
{
hasAlpha = true;
break;
}
}
}
var width = texture.width;
var height = texture.height;
System.Func <Color32, Color32> func = null;
var format = (TextureFormat)int.MinValue; // 絶対不正値
if (hasAlpha)
{
// func = ColorReductionUtil.To1111; // デバグ用1bit化
// func = ColorReductionUtil.To3320; // デバグ用332bit化
func = ColorReductionUtil.To4444;
format = TextureFormat.ARGB4444;
}
else
{
// func = ColorReductionUtil.To1111; // デバグ用1bit化
// func = ColorReductionUtil.To3320; // デバグ用332bit化
func = ColorReductionUtil.To5650;
format = TextureFormat.RGB565;
}
// 全ミップレベルで回す
for (int i = 0; i < texture.mipmapCount; i++)
{
if (i != 0) // 一番上はすでに取ってあるので繰り返さない
{
pixels = texture.GetPixels32(i);
}
ColorReductionUtil.FloydSteinberg(pixels, func, width, height);
texture.SetPixels32(pixels, i);
width = Mathf.Max(1, width / 2); // 次のサイズへ
height = Mathf.Max(1, height / 2); // 次のサイズへ
}
EditorUtility.CompressTexture(texture, format, quality: 100);
var t1 = Time.realtimeSinceStartup;
Debug.Log("ColorReductionImporter: " + path + " t:" + (t1 - t0));
}
void CompressTo4444(Texture2D texture, string path, bool dither)
{
var pixels = texture.GetPixels32();
var width = texture.width;
var height = texture.height;
string postfix;
if (dither)
{
ColorReductionUtil.FloydSteinberg(pixels, ColorReductionUtil.To4444, width, height);
}
else
{
for (int i = 0; i < pixels.Length; i++)
{
pixels[i] = ColorReductionUtil.To4444(pixels[i]);
}
}
texture.SetPixels32(pixels);
EditorUtility.CompressTexture(texture, TextureFormat.ARGB4444, quality: 100);
}
