feat: add raw endpoint

README.md

@@ -7,6 +7,7 @@ I use this toy project to stream my remarkable 2 (firmware 2.5) on my laptop usi
 [video that shows some features](https://www.youtube.com/watch?v=PzlQ2hEIdCc)
 
 Note: click on the video to take a screenshot. The screenshot is a png file with transparent background.
+
 ## Quick start
 
 You need ssh access to your remarkable
@@ -27,6 +28,9 @@ scp goMarkableStreamServer.arm remarkable:
 ssh remarkable './goMarkableStreamServer.arm'
 ```
 
+Note: The processus is fault tolerant and should resume automatically on sleep/wakup or network failure; therefore, you can, normally, launch the processus in background (with `nohup`)
+
+
 ### The client
 
 - Start the client: `RK_SERVER_ADDR=ip.of.remarkable:2000 ./goMarkableClient`
@@ -51,6 +55,7 @@ It is possible to tweak the configuration via environment variables:
 | RK_CLIENT_AUTOROTATE      | true            | activate autorotate (see below)
 | RK_CLIENT_PAPER_TEXTURE   | null            | a path to a texture
 | RK_CLIENT_COLORIZE        | false           | try to colorize the highliter
+
 ## Features
 
 ### Auto-rotate
@@ -99,7 +104,14 @@ ex:
 /tmp/screenshot.png: PNG image data, 1404 x 1872, 8-bit/color RGBA, non-interlaced
 ```
 
+### Raw picture
 
+the `/raw` endpoind exposes the raw picture without any treatment. It is possible to pipe the result into a thrid party tool such as imageMagick for example.
+
+This generates a pdf from the screen
+```shell
+curl http://localhost:8080/raw | convert -depth 8 -size 1404x1872+0 gray:- shot.pdf
+```
 
 ## How it works?
 

client/grabber.go

@@ -1,10 +1,12 @@
 package main
 
 import (
+	"bytes"
 	"context"
 	"encoding/gob"
 	"image"
 	"image/png"
+	"io"
 	"log"
 	"net/http"
 	"time"
@@ -140,3 +142,15 @@ func (g *grabber) getScreenshot(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 }
+
+func (g *grabber) getRaw(w http.ResponseWriter, r *http.Request) {
+	tick := time.Tick(1 * time.Second)
+	select {
+	case img := <-g.imageC:
+		w.Header().Add("Cntent-Type", "application/octet-stream")
+		io.Copy(w, bytes.NewReader(img.Pix))
+	case <-tick:
+		http.Error(w, "no content", http.StatusNoContent)
+		return
+	}
+}

client/main.go

@@ -57,6 +57,7 @@ func main() {
 	mux.HandleFunc("/favicon.ico", faviconHandler)
 	mux.HandleFunc("/screenshot", g.getScreenshot)
 	mux.HandleFunc("/gob", g.getGob)
+	mux.HandleFunc("/raw", g.getRaw)
 	mux.HandleFunc("/video", makeGzipHandler(mjpegStream))
 	log.Printf("listening on %v", c.BindAddr)
 	go func() {