for(; (cx+margin<font->image.w && used_pixels[cx]>cy); ++cx)
if(used_pixels[cx]-cy-padding>target_h)
target_h = used_pixels[cx]-cy-padding;
for(; (cx+margin<font->image.w && used_pixels[cx]>cy); ++cx)
if(used_pixels[cx]-cy-padding>target_h)
target_h = used_pixels[cx]-cy-padding;