From 9a61719a820b98a64bfc52228e05721a043dc91b Mon Sep 17 00:00:00 2001
From: Jules Laplace <julescarbon@gmail.com>
Date: Tue, 21 Aug 2018 15:33:30 +0200
Subject: fade sequence

---
 .../modules/pix2pixhd/views/pix2pixhd.live.js      |  5 +++
 rpc/img_ops.py                                     | 37 ++++++++++++----------
 2 files changed, 26 insertions(+), 16 deletions(-)

diff --git a/app/client/modules/pix2pixhd/views/pix2pixhd.live.js b/app/client/modules/pix2pixhd/views/pix2pixhd.live.js
index 2c89459..8cef4bd 100644
--- a/app/client/modules/pix2pixhd/views/pix2pixhd.live.js
+++ b/app/client/modules/pix2pixhd/views/pix2pixhd.live.js
@@ -156,6 +156,11 @@ class Pix2PixHDLive extends Component {
                 name='sequence_skip'
                 min={0} max={100} type='int'
               />
+              <Slider live
+                title='fade sequence'
+                name='fade_sequence'
+                min={0} max={4.0} type='float'
+              />
               <Slider live
                 name='frame_delay'
                 min={0.0} max={2.0} type='float'
diff --git a/rpc/img_ops.py b/rpc/img_ops.py
index 6be1d0b..e25afb1 100644
--- a/rpc/img_ops.py
+++ b/rpc/img_ops.py
@@ -66,6 +66,13 @@ def process_image(opt, data_opt, im):
   img = np.add(array_a, array_b).astype('uint8')
   return img
 
+def mix(frac, a, b):
+  frac_a = frac
+  frac_b = 1.0 - frac_a
+  array_a = np.multiply(a.astype('float64'), frac_a)
+  array_b = np.multiply(b.astype('float64'), frac_b)
+  return np.add(array_a, array_b).astype('uint8')
+
 last_im = None
 def mix_next_image(opt, data_opt, rpc_client, im, i=0, sequence, sequence_i=0, skip_i=0):
   global last_im
@@ -115,12 +122,18 @@ def mix_next_image(opt, data_opt, rpc_client, im, i=0, sequence, sequence_i=0, s
     image_pil.save(tmp_path)
     os.rename(tmp_path, current_path)
 
+  recursive_frac = data_opt.recursive_frac
+  sequence_frac = data_opt.sequence_frac
+  if data_opt.sequence_skip > 0 and data_opt.fade_sequence > 0:
+    sequence_frac *= (1.0 - (skip_i * data_opt.fade_sequence) / (data_opt.sequence_skip - 1))
+    sequence_frac = max(0, min(sequence_frac, 1))
+
   if data_opt.recursive and last_im is not None:
-    if data_opt.sequence and len(sequence):
+    if data_opt.sequence and len(sequence) and sequence_frac > 0:
       A_img = Image.open(sequence_path).convert('RGB')
       A_im = np.asarray(A_img)
-      frac_a = data_opt.recursive_frac
-      frac_b = data_opt.sequence_frac
+      frac_a = recursive_frac
+      frac_b = sequence_frac
       frac_sum = frac_a + frac_b
       if frac_sum > 1.0:
         frac_a = frac_a / frac_sum
@@ -138,29 +151,21 @@ def mix_next_image(opt, data_opt, rpc_client, im, i=0, sequence, sequence_i=0, s
       next_im = array_abc.astype('uint8')
 
     else:
-      frac_a = data_opt.recursive_frac
-      frac_b = 1.0 - frac_a
-      array_a = np.multiply(last_im.astype('float64'), frac_a)
-      array_b = np.multiply(im.astype('float64'), frac_b)
-      next_im = np.add(array_a, array_b).astype('uint8')
+      next_im = mix(data_opt.recursive_frac, last_im, im)
 
     if data_opt.recurse_roll != 0:
       last_im = np.roll(im, data_opt.recurse_roll, axis=data_opt.recurse_roll_axis)
     else:
       last_im = next_im.copy().astype('uint8')
 
-  elif data_opt.sequence and len(sequence):
+  elif data_opt.sequence and len(sequence) and sequence_frac > 0:
     A_img = Image.open(sequence_path).convert('RGB')
     A_im = np.asarray(A_img)
-    frac_b = data_opt.sequence_frac
+    sequence_frac = data_opt.sequence_frac
     if data_opt.transition:
       t = lerp(math.sin(i / data_opt.transition_period * math.pi * 2.0 ) / 2.0 + 0.5, data_opt.transition_min, data_opt.transition_max)
-      frac_b *= 1.0 - t
-    frac_c = 1.0 - frac_b
-    array_b = np.multiply(A_im.astype('float64'), frac_b)
-    array_c = np.multiply(im.astype('float64'), frac_c)
-    array_bc = np.add(array_b, array_c)
-    next_im = array_bc.astype('uint8')
+      sequence_frac *= 1.0 - t
+    next_im = mix(sequence_frac, A_im, im)
 
   else:
     last_im = im.copy().astype('uint8')
-- 
cgit v1.2.3-70-g09d2