Computing the combined color of two colors (Over operator)

Question

This is for an Android application. Let\'s say that I have two colors with alpha

int color1 = 0x12345678  // aarrggbb
int color2 = 0x87654321

Answer 1

I think what you want might be PorterDuff.Mode.Multiply

... used with PorterDuffColorFilter.

EDIT: Actually maybe you want mode DST_OVER for destination color "over" source color.