public void ditherImage(PixelProvider img, ColorReducer cr)
{
this.img = img;
int w = img.getWidth ();
int h = img.getHeight ();
int [] rgba = new int[4];
int [] rgbaReduced = new int[4];
int ofs;
//final int lastRow = h-1;
//final int lastColumn = w-1;
for (int y = 0; y < h; ++y)
for (int x = 0; x < w; ++x) {
ofs = img.ofs (x, y);
img.getPixelAt (ofs, rgba);
cr.reduceToClosest (rgba, rgbaReduced);
img.setPixelAt (ofs, rgbaReduced);
calcDiff (rgba, rgbaReduced);
//////////////////////////
// order, apply error to original pixels
// (x-1,y+1) = 3/16 , (x,y+1) = 5/16, (x+1,y+1) = 1/16, (x+1, y)=7/16
correctPixel (x - 1, y + 1, 3);
correctPixel (x, y + 1, 5);
correctPixel (x + 1, y + 1, 1);
correctPixel (x + 1, y, 7);
}
// no longer need img
this.img = null;
}
public void ditherImage(PixelProvider img, ColorReducer cr)
{
this.img = img;
int w = img.getWidth();
int h = img.getHeight();
int [] rgba = new int[4];
int [] rgbaReduced = new int[4];
int ofs;
//final int lastRow = h-1;
//final int lastColumn = w-1;
for (int y = 0; y < h; ++y)
{
for (int x = 0; x < w; ++x)
{
ofs = img.ofs(x, y);
img.getPixelAt(ofs, rgba);
cr.reduceToClosest(rgba, rgbaReduced);
img.setPixelAt(ofs, rgbaReduced);
calcDiff(rgba, rgbaReduced);
//////////////////////////
// order, apply error to original pixels
// (x-1,y+1) = 3/16 , (x,y+1) = 5/16, (x+1,y+1) = 1/16, (x+1, y)=7/16
correctPixel(x - 1, y + 1, 3);
correctPixel(x, y + 1, 5);
correctPixel(x + 1, y + 1, 1);
correctPixel(x + 1, y, 7);
}
}
// no longer need img
this.img = null;
}