move translate_to_integers and ramps_to_function to aux.py

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/src/aux.py b/src/aux.py
new file mode 100644
index 0000000..ec94549
--- /dev/null
+++ b/src/aux.py
@@ -0,0 +1,56 @@
+#!/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/>.
+
+from curve import *
+
+
+def translate_to_integers():
+    '''
+    Translate the curves from float to integer
+    
+    @param  :(list<int>, list<int>, 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:int     The red colour curves as [0, 65535] integers
+    @param   g:int     The green colour curves as [0, 65535] integers
+    @param   b: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
+    '''
+    r = [y / 65535 for y in r]
+    g = [y / 65535 for y in g]
+    b = [y / 65535 for y in b]
+    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):
+                y = int(curve[i] * (len(cur) - 1) + 0.5)
+                y = min(max(0, y), len(cur) - 1)
+                curve[i] = cur[y]
+    return lambda : fcurve(r, g, b)
+