From fc46087ce9c451acded2692bcb9064ba7a716e60 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Tue, 27 Jun 2023 15:49:47 +0200
Subject: [PATCH] scripts: generate-alt-random: set P2=1 when emitting sixels

P2=1 means "empty sixels remain at their current color". This is
usually the case with modern sixel encoders.
---
 scripts/generate-alt-random-writes.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/generate-alt-random-writes.py b/scripts/generate-alt-random-writes.py
index 812b0213..789d64e0 100755
--- a/scripts/generate-alt-random-writes.py
+++ b/scripts/generate-alt-random-writes.py
@@ -207,8 +207,8 @@ def main():
             six_height, six_width = last_size
             six_rows = (six_height + 5) // 6  # Round up; each sixel is 6 pixels
 
-            # Begin sixel
-            out.write('\033Pq')
+            # Begin sixel (with P2=1 - empty sixels are transparent)
+            out.write('\033P;1q')
 
             # Sixel size. Without this, sixels will be
             # auto-resized on cell-boundaries.