Provide more methods to line transformation / pixel handling

[leonbloy]

From hgonzalez@gmail.com on May 27, 2011 13:15:17

• Similar to tf_unpack: tf_paletteToRGB() , stripAlpha, etc
• Revise scaling with unpack and low bit detph
• Methods that convert to double in LineImage (keep them? refactor?)

Original issue: http://code.google.com/p/pngj/issues/detail?id=4

[leonbloy]

From hgonzalez@gmail.com on December 01, 2012 12:42:41

fix methods in LineImageHelper do work with int or bytes

[edamo]

Would like a simple getARGB(x, y) function (like awt BufferedImage.getRGB(x,y)) to return A,R,G,B regardless of png type (bitdepth, index etc).