From 6d967bc1f9bec76a6eb2627079cd77b90cf0c5ab Mon Sep 17 00:00:00 2001
From: Alex X <alexey.khit@gmail.com>
Date: Thu, 16 May 2024 17:33:09 +0300
Subject: [PATCH] Improve ascii stream for any one symbol

---
 internal/mjpeg/README.md |  7 ++++---
 pkg/ascii/ascii.go       | 35 +++++++++++++++--------------------
 2 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/internal/mjpeg/README.md b/internal/mjpeg/README.md
index eabe62e0..e261d0d5 100644
--- a/internal/mjpeg/README.md
+++ b/internal/mjpeg/README.md
@@ -9,18 +9,19 @@
 - escape text param with urlencode
 - you can stream any camera or file from a disc
 
-**go2rtc.yaml** - transcoding to MJPEG, terminal size - 210x60, fps - 4
+**go2rtc.yaml** - transcoding to MJPEG, terminal size - 210x59 (16/9), fps - 10
 
 ```yaml
 streams:
-  macarena: ffmpeg:macarena.mp4#video=mjpeg#hardware#width=210#height=60#raw=-r 4
+  macarena: ffmpeg:macarena.mp4#video=mjpeg#hardware#width=210#height=59#raw=-r 10
 ```
 
 **API params**
 
 - `color` - foreground color, values: empty, `8`, `256`, `rgb`
 - `back` - background color, values: empty, `8`, `256`, `rgb`
-- `text` - character set, values: empty, one space, two spaces, anything you like (in order of brightness)
+- `text` - character set, values: empty, one char, `block`, list of chars (in order of brightness)
+  - example: `%20` (space), `block` (block elements), `ox` (two chars)
 
 **Examples**
 
diff --git a/pkg/ascii/ascii.go b/pkg/ascii/ascii.go
index 959ab265..c75d7f88 100644
--- a/pkg/ascii/ascii.go
+++ b/pkg/ascii/ascii.go
@@ -61,35 +61,30 @@ func NewWriter(w io.Writer, foreground, background, text string) io.Writer {
 		}
 	}
 
-	var ascii string
-	switch text {
-	case "":
-		ascii = ` .::--~~==++**##%%$@`
-	case " ":
-		a.text = func(r, g, b uint32) {
-			a.buf = append(a.buf, ' ')
+	if len(text) == 1 {
+		// fast 1 symbol version
+		a.text = func(_, _, _ uint32) {
+			a.buf = append(a.buf, text[0])
 		}
-	case "  ":
-		a.text = func(r, g, b uint32) {
-			a.buf = append(a.buf, ' ', ' ')
+	} else {
+		switch text {
+		case "":
+			text = ` .::--~~==++**##%%$@` // default for empty text
+		case "block":
+			text = " ░░▒▒▓▓█" // https://en.wikipedia.org/wiki/Block_Elements
 		}
-	case "block":
-		ascii = " ░░▒▒▓▓█" // https://en.wikipedia.org/wiki/Block_Elements
-	default:
-		ascii = text
-	}
-	if ascii != "" {
-		if runes := []rune(ascii); len(runes) != len(ascii) {
+
+		if runes := []rune(text); len(runes) != len(text) {
 			k := float32(len(runes)-1) / 255
 			a.text = func(r, g, b uint32) {
 				i := gray(r, g, b, k)
 				a.buf = utf8.AppendRune(a.buf, runes[i])
 			}
 		} else {
-			k := float32(len(ascii)-1) / 255
+			k := float32(len(text)-1) / 255
 			a.text = func(r, g, b uint32) {
 				i := gray(r, g, b, k)
-				a.buf = append(a.buf, ascii[i])
+				a.buf = append(a.buf, text[i])
 			}
 		}
 	}
@@ -130,7 +125,7 @@ func (a *writer) Write(p []byte) (n int, err error) {
 		a.buf = append(a.buf, '\n')
 	}
 
-	a.buf = append(a.buf, "\033[0m\n"...)
+	a.buf = append(a.buf, "\033[0m"...)
 
 	if n, err = a.wr.Write(a.buf); err == nil {
 		a.wr.(http.Flusher).Flush()