#!/usr/bin/env python3 # Copyright © 2014 Mattias Andrée (maandree@member.fsf.org) # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # This module contains auxiliary functions. from curve import * def translate_to_integers(): ''' Translate the curves from float to integer @return :(r:list<int>, g:list<int>, b:list<int>) The red curve, the green curve and, the blue curve mapped to integers ''' R_curve, G_curve, B_curve = [0] * i_size, [0] * i_size, [0] * i_size for i_curve, o_curve in ((r_curve, R_curve), (g_curve, G_curve), (b_curve, B_curve)): for i in range(i_size): o_curve[i] = int(i_curve[i] * (o_size - 1) + 0.5) if clip_result: o_curve[i] = min(max(0, o_curve[i]), (o_size - 1)) return (R_curve, G_curve, B_curve) def ramps_to_function(r, g, b): ''' Convert a three colour curves to a function that applies those adjustments @param r:list<int> The red colour curves as [0, 65535] integers @param g:list<int> The green colour curves as [0, 65535] integers @param b:list<int> The blue colour curves as [0, 65535] integers @return :()→void Function to invoke to apply the curves that the parameters [r, g and b] represents ''' fp = lambda c : [y / 65535 for y in c] return functionise((fp(r), fp(g), fp(b))) def functionise(rgb): ''' Convert a three colour curves to a function that applies those adjustments @param rgb:(r:list<float>, g:list<float>, b:list<float>) The colour curves as [0, 1] values @return :()→void Function to invoke to apply the curves that the parameters [r, g and b] represents ''' def fcurve(R_curve, G_curve, B_curve): for curve, cur in curves(R_curve, G_curve, B_curve): for i in range(i_size): # Nearest neighbour y = int(curve[i] * (len(cur) - 1) + 0.5) # Truncation to actual neighbour y = min(max(0, y), len(cur) - 1) # Remapping curve[i] = cur[y] return lambda : fcurve(*rgb) def store(): ''' Store the current adjustments @return :(r:list<float>, g:list<float>, b:list<float>) The colour curves ''' return (r_curve[:], g_curve[:], b_curve[:]) def restore(rgb): ''' Discard any currently applied adjustments and apply stored adjustments @param rgb:(r:list<float>, g:list<float>, b:list<float>) The colour curves to restore ''' (r_curve[:], g_curve[:], b_curve[:]) = rgb