Bitmap matrix from Texture2D

Hi I'm trying to convert c# code that works with System.Drawing.Bitmap into Unity. What I'm trying to do is swap out all references to Bitmap with Texture2D.

I have the following method:

Code (CSharp):

1.  
2. /// <summary>
3.         ///
4.         /// Produces a binary Matrix with Dimensions
5.         /// For the threshold, we take the sum of  weighted R,g,b value. The sum of weights must be 1.
6.         /// The result fills the field bm;
7.         /// </summary>
8.         /// <param name="bitmap"> A Bitmap, which will be transformed to a binary Matrix</param>
9.         /// <returns>Returns a binaray boolean Matrix </returns>
10.         static Bitmap_p ConvertBitmap(Bitmap bitmap)
11.         {
12.  
13.             byte[] Result = new byte[bitmap.Width * bitmap.Height];
14.             BitmapData SourceData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
15.             unsafe
16.             {
17.                 byte* SourcePtr = (byte*)(void*)SourceData.Scan0;
18.  
19.                 int l = Result.Length;
20.                 Debug.Log(l);
21.                 for (int i = 0; i < l; i++)
22.                 {
23.                     //  if ((0.2126 * (double)SourcePtr[4 * i + 2] + 0.7153 * (double)SourcePtr[4 * i + 1] + 0.0721 * (double)SourcePtr[4 * i]) < Treshold*255)
24.                     if (((double)SourcePtr[4 * i + 2] + (double)SourcePtr[4 * i + 1] + (double)SourcePtr[4 * i]) < Treshold * 255 * 3)
25.                         Result[i] = 1;
26.                     else
27.                         Result[i] = 0;
28.                 }
29.             }
30.  
31.             bitmap.UnlockBits(SourceData);
32.             bm = new Bitmap_p(bitmap.Width, bitmap.Height);
33.             bm.data = Result;
34.  
35.             return bm;
36.         }
37.         }

I tried to do this:

Code (CSharp):

1.        
2.         static Bitmap_p ConvertBitmap(Texture2D texture)
3.         {
4.  
5.             byte[] original = texture.EncodeToPNG();
6.             byte[] result = new byte[texture.width * texture.height];
7.  
8.             for (int i = 0; i < original.Length; i++)
9.             {
10.                 if (((double)original[4 * i + 2] + (double)original[4 * i + 1] + (double)original[4 * i]) < Treshold * 255 * 3)
11.                     result[i] = 1;
12.                 else
13.                     result[i] = 0;
14.             }
15.  
16.             bm = new Bitmap_p(texture.width, texture.height);
17.             bm.data = result;
18.  
19.             return bm;
20.         }

but I'm getting array index out of bounds errors. I'm completely not used to working with pointers so I'm confused as heck. Also, perhaps `PixelFormat.Format32bppArgb` is a different format than EncodeToPNG? Can anyone help me along?

 

Got it.

Code (CSharp):

1.       static Bitmap_p ConvertTexture(Texture2D texture)
2.         {
3.             var original = texture.GetPixels32();
4.             byte[] result = new byte[texture.width * texture.height];
5.  
6.             for (int i = 0; i < original.Length; i++)
7.             {
8.                 if(original[i].r + original[i].g + original[i].b < Treshold * 255 * 3)
9.                 {
10.                     result[i] = 1;
11.                 }
12.                 else
13.                 {
14.                     result[i] = 0;
15.                 }
16.             }
17.  
18.             bm = new Bitmap_p(texture.width, texture.height){
19.                 data = result
20.             };
21.  
22.             return bm;
23.         }

Leaving this thread as it might be useful to others.