From f1aa71a434bade3fc6ecb28c6816b0111d126e56 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Haoran=20S=2E=20Diao=20=28=E5=88=81=E6=B5=A9=E7=84=B6=29?=
 <0@hairydiode.xyz>
Date: Sun, 2 Jul 2023 04:35:10 -0700
Subject: did some optimizations to make things a lot faster at the cost of
 making bbrll only work with 1/0 inputs, and if the buffer is exactly some
 multiple of 2x4 large

---
 bbrll | 45 ++++++++++++++++++---------------------------
 1 file changed, 18 insertions(+), 27 deletions(-)

(limited to 'bbrll')

diff --git a/bbrll b/bbrll
index 661fd14..e94c1e8 100755
--- a/bbrll
+++ b/bbrll
@@ -43,6 +43,8 @@ function canvas() {
 
 #prints a single braille at $1=x $2=y
 function print_sin_braille() {
+#NOTE, for optimization purposes, this only works if the buffer consits of 1s
+#and 0s
 #bit to braille 
 #
 #0 3
@@ -51,42 +53,31 @@ function print_sin_braille() {
 #6 7
 #reverse 
 #(1,3)(0,3)(1,2)(1,1)(1,0)(0,2)(0,1)(0,0)
-	#converts anything other than ., and empty string, or space into 1, else
-	#0
-	prompt='s/[^\. ]/1/;s/^[^1]*$/0/'
 
-	b0=$( echo ${rawbuff[((0+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
-	b1=$( echo ${rawbuff[((1+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
-	b2=$( echo ${rawbuff[((2+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
-	b3=$( echo ${rawbuff[((0+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
-	b4=$( echo ${rawbuff[((1+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
-	b5=$( echo ${rawbuff[((2+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
-	b6=$( echo ${rawbuff[((3+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
-	b7=$( echo ${rawbuff[((3+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
-	#echo "2#$b7$b600$b5$b4$b3$b2$b1$b0"
+	b0=${rawbuff[((0+4*$2))]:((0+2*$1)):1}
+	b1=${rawbuff[((1+4*$2))]:((0+2*$1)):1}
+	b2=${rawbuff[((2+4*$2))]:((0+2*$1)):1}
+	b3=${rawbuff[((0+4*$2))]:((1+2*$1)):1}
+	b4=${rawbuff[((1+4*$2))]:((1+2*$1)):1}
+	b5=${rawbuff[((2+4*$2))]:((1+2*$1)):1}
+	b6=${rawbuff[((3+4*$2))]:((0+2*$1)):1}
+	b7=${rawbuff[((3+4*$2))]:((1+2*$1)):1}
+
+	#ors it with the utf-8 hex value of the empty braille character
 	#the two spaces assume aht the encoding is utf-8, convoluted bitwise OR
 	#and coversion between character and number stuff
-	echo "obase=16;$(( 2#$b7${b6}00$b5$b4$b3$b2$b1$b0 | 0x$(echo -n ⠀ |xxd -p -u)))" |bc | xxd --reverse -ps
+	echo "obase=16;$(( 2#$b7${b6}00$b5$b4$b3$b2$b1$b0 | 0xE2A080 ))"|bc | xxd --reverse -ps
 }
 
 function print_braille() {
 	#I do the lazy thing and just test the first line
 	w=${#rawbuff[0]}
 	h=${#rawbuff[@]}
-	#conver to braille coords, since bash rounds down, account for when
-	#there a braille character that will not be completely filled(it can
-	#handle this fine because of how the sed pattern was constructed in
-	#print_sin_braille)
-	if [ $((w % 2)) -gt 0 ]; then
-		w=$((w/2+1))
-	else
-		w=$((w/2))
-	fi
-	if [ $((h % 4)) -gt 0 ]; then
-		h=$((h/4+1))
-	else
-		h=$((h/4))
-	fi
+	#conver to braille coords, we do not want to try to print incomplete
+	#characters because they will break with our optimization, so rounding
+	#down is good
+	w=$((w/2))
+	h=$((h/4))
 	i=0
 	j=0
 	while [ $i -lt $h ]; do
-- 
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