add (prototype for) lower_resolution just for fun

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

1 files changed, 18 insertions, 0 deletions

diff --git a/src/curve.py b/src/curve.py
index c88b02d..c98f454 100644
--- a/src/curve.py
+++ b/src/curve.py
@@ -455,6 +455,24 @@ def manipulate(r, g = None, b = None):
             curve[i] = f(curve[i])
 
 
+# TODO document this elsewhere, and make it possible to have non-round x_colours
+def lower_resolution(x_colours, y_colours):
+    '''
+    Emulates low colour resolution
+    
+    @param  x_colours:int  The number of colours to emulate on the encoding axis
+    @param  y_colours:int  The number of colours to emulate on the output axis
+    '''
+    x_r = i_size / x_colours
+    y_r = o_size / y_colours
+    for curve in (r_curve, g_curve, b_curve):
+        for i in range(i_size):
+            x = int(x_r * int(i / x_r))
+            y = curve[x] * 2 ** 16
+            y = int(y_r * int(y / y_r))
+            curve[i] = y / 2 ** 16
+
+
 def start_over():
     '''
     Reverts all colours curves to identity mappings.