How to Extract a Pixel Array from a Go Image?

How to Get a Pixel Array from a Go Image

In Go, you can obtain a pixel array from an image loaded from a file using the image package. This array can be passed to the texImage2D method of the Contex from the /mobile/gl package.

To get a pixel array, follow these steps:

1. Load the image from a file:

   a, err := asset.Open("key.jpeg")
   if err != nil {
    log.Fatal(err)
   }
   defer a.Close()
   
   img, _, err := image.Decode(a)
   if err != nil {
    log.Fatal(err)
   }

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2. Create a bi-dimensional array to store the pixel values:

   var pixels [][]Pixel

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3. Iterate through the image pixels and extract their RGBA values:

   bounds := img.Bounds()
   width, height := bounds.Max.X, bounds.Max.Y
   for y := 0; y < height; y++ {
    var row []Pixel
    for x := 0; x < width; x++ {
        r, g, b, a := img.At(x, y).RGBA()
        pixel := rgbaToPixel(r, g, b, a)
        row = append(row, pixel)
    }
    pixels = append(pixels, row)
   }

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4. Convert the RGBA values to pixels:

   func rgbaToPixel(r uint32, g uint32, b uint32, a uint32) Pixel {
    return Pixel{int(r / 257), int(g / 257), int(b / 257), int(a / 257)}
   }

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5. Return the pixel array:

   return pixels

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The returned pixel array can be passed to the texImage2D method to display the image.

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