PNG_FP_HALF      1357 3rdparty/libpng/pngwrite.c                ((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1);
PNG_FP_HALF      1385 3rdparty/libpng/pngwrite.c          tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF;