From 3a20754ea69a49134fbb0d0626ef6d5c86b2dc59 Mon Sep 17 00:00:00 2001
From: mid-kid <esteve.varela@gmail.com>
Date: Tue, 14 Nov 2023 22:29:55 +0100
Subject: [PATCH] Allow printing *bigger* images

---
 init_printer.sh |  2 +-
 print_image.sh  | 11 +++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/init_printer.sh b/init_printer.sh
index d1472e3..6cbf0c8 100755
--- a/init_printer.sh
+++ b/init_printer.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 dev=/dev/usb/lp0
 
diff --git a/print_image.sh b/print_image.sh
index 6ca9e1d..65744b6 100755
--- a/print_image.sh
+++ b/print_image.sh
@@ -2,23 +2,26 @@
 set -e
 dev=/dev/usb/lp0
 
-image="$(magick "$1" -resize 512x -dither FloydSteinberg -remap pattern:gray50 pbm:- | base64)"
+image="$(magick "$1"'[0]' -resize 512x1662\> -dither FloydSteinberg -remap pattern:gray50 pbm:- | base64)"
 data_header="$(echo "$image" | base64 -d | sed -n '2p')"
 data="$(echo "$image" | base64 -d | tail -n +3 | base64)"
 
+hex_size32() {
+    printf '%08x' "$1" | sed -e 's/\(..\)\(..\)\(..\)\(..\)/\\x\4\\x\3\\x\2\\x\1/g'
+}
 hex_size() {
     printf '%04x' "$1" | sed -e 's/\(..\)\(..\)/\\x\2\\x\1/g'
 }
 
 size="$(echo "$data" | base64 -d | wc -c)"
-size="$(hex_size "$(("$size" + 10))")"
+size="$(hex_size32 "$(("$size" + 10))")"
 size_x="$(hex_size "$(echo "$data_header" | cut -d' ' -f 1)")"
 size_y="$(hex_size "$(echo "$data_header" | cut -d' ' -f 2)")"
 
 ./init_printer.sh
 
 # Upload graphics data
-printf '\x1D(L' > $dev
+printf '\x1D8L' > $dev
 printf "$size" > $dev
 printf '0p0' > $dev
 printf '\1\1' > $dev  # bx, by (1 or 2)
@@ -28,7 +31,7 @@ printf "$size_y" > $dev  # size y
 echo "$data" | base64 -d > $dev
 
 # Print graphics data
-printf '\x1D(L\2\0' > $dev
+printf '\x1D8L\2\0\0\0' > $dev
 printf '02' > $dev
 
 ./cut_paper.sh