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  Libgdx change pixel's color  (Read 3154 times)
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Offline hugotheman

Senior Newbie





« Posted 2014-11-28 14:45:48 »

Hey, I'm using Libgdx and I want to take a texture, replace all occurances of a color with another specified color.

This is what I have so far, I'm just not sure on changing the colors (I'm very new to Pixmaps, so I'm sure there are errors everywhere):
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// e.g. replace all red pixels with green pixels: replaceColor(Assets.exampleTexture, 0xFF0000, 0x00FF00);
public Texture replaceColor(Texture texture, int c1, int c2) {
      TextureData textureData = texture.getTextureData();
      textureData.prepare();
      Pixmap pixmap = textureData.consumePixmap();
     
      ByteBuffer pixels = pixmap.getPixels();

      while(pixels.hasRemaining()) {
                     if(pixels.getInt() == c1) pixels.putInt(c2);
      }
     
      pixels.rewind();
     
      return new Texture(pixmap);
   }



Thanks. Smiley
Offline Springrbua
« Reply #1 - Posted 2014-11-28 15:06:21 »

You could iterate througth the PixMap using this code: 
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for (int x=0; x<pixmap.getWidth(); x++) {
    for (int y=0; y<pixmap.getHeight(); y++) {
         int color = pixmap.getPixel(x, y);
    }
}


The int color now holds the RGBA8888 Value of the Pixels color. 
To change it simply use:
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drawPixel(x, y, newColor)
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