public static void AlphaMerge(Texture2D rgbTex, Texture2D alphaTex)
{
int width = rgbTex.width;
int height = rgbTex.height;
if (width > 0 && height > 0 && alphaTex.width == width && alphaTex.height == height)
{
Color32[] rgbPixels = rgbTex.GetPixels32();
Color32[] alphaPixels = alphaTex.GetPixels32();
Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppRgb);
bitmap.MakeTransparent();
for (int i = 0; i < height; i++)
{
for (int j = 0; j < width; j++)
{
Color32 rgbPixel = rgbPixels[i * width + j];
Color32 alphaPixel = alphaPixels[i * width + j];
bitmap.SetPixel(j, height - 1 - i, System.Drawing.Color.FromArgb(alphaPixel.r, rgbPixel.r, rgbPixel.g, rgbPixel.b));
}
}
ImageTGA imageTga = new ImageTGA();
imageTga.Image = bitmap;
string path = Application.dataPath + AssetDatabase.GetAssetPath(rgbTex.GetInstanceID()).Substring("Assets".Length);
imageTga.SaveImage(path);
string alphaPath = Application.dataPath + AssetDatabase.GetAssetPath(alphaTex.GetInstanceID()).Substring("Assets".Length);
File.Delete(alphaPath);
}
}
public static void AlphaStrip(Texture2D tex)
{
int width = tex.width;
int height = tex.height;
Color32[] pixels = tex.GetPixels32();
Bitmap bitmapRgb = new Bitmap(width, height, PixelFormat.Format24bppRgb);
Bitmap bitmapAlpha = new Bitmap(width, height, PixelFormat.Format24bppRgb);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
Color32 pixel = pixels[y * width + x];
bitmapRgb.SetPixel(x, height - 1 - y, System.Drawing.Color.FromArgb(pixel.r, pixel.g, pixel.b));
bitmapAlpha.SetPixel(x, height - 1 - y, System.Drawing.Color.FromArgb(pixel.a, pixel.a, pixel.a));
}
}
ImageTGA imageTga = new ImageTGA();
imageTga.Image = bitmapRgb;
string rgbPath = Application.dataPath + AssetDatabase.GetAssetPath(tex.GetInstanceID()).Substring("Assets".Length);
imageTga.SaveImage(rgbPath);
imageTga.Image = bitmapAlpha;
string alphaPath = GetAlphaPath(rgbPath);
imageTga.SaveImage(alphaPath);
}
