Invert bitmap colors

Question

I have the following problem. I have a charting program, and it\'s design is black, but the charts (that I get from the server as images) are light (it actually uses only 5 colo

Answer 1

Manipulating a bitmap is much faster if you copy the image data into an int array by calling getPixels only once, and don't call any function inside the loop. Just manipulate the array, then call setPixels at the end.

Something like that:

int length = bitmap.getWidth()*bitmap.getHeight();
int[] array = new int[length];
bitmap.getPixels(array,0,bitmap.getWidth(),0,0,bitmap.getWidth(),bitmap.getHeight());
for (int i=0;i