From 8b2945ceb8589b123575cfe2eb350a9464afc6af Mon Sep 17 00:00:00 2001
From: Tres Finocchiaro <tres.finocchiaro@gmail.com>
Date: Wed, 17 Apr 2024 23:08:06 -0400
Subject: [PATCH] Add "legacy" ESCPOS striping support (#1254)

epsonSlices: Restore 2.0.11 behavior; adds dotDensity: "double-legacy"
---
 js/qz-tray.js                               | 11 ++++++++++
 src/qz/printer/action/PrintRaw.java         |  3 +++
 src/qz/printer/action/raw/ImageWrapper.java | 24 ++++++++++++++++++---
 3 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/js/qz-tray.js b/js/qz-tray.js
index ee455d89a..4a31f5dce 100644
--- a/js/qz-tray.js
+++ b/js/qz-tray.js
@@ -853,6 +853,17 @@ var qz = (function() {
                     }
                 }
 
+                if(_qz.tools.versionCompare(2, 2, 4) < 0) {
+                    for(var i = 0; i < printData.length; i++) {
+                        if (printData[i].constructor === Object) {
+                            // dotDensity: "double-legacy|single-legacy" since 2.2.4.  Fallback to "double|single"
+                            if (printData[i].options && typeof printData[i].options.dotDensity === 'string') {
+                                printData[i].options.dotDensity = printData[i].options.dotDensity.toLowerCase().replace("-legacy", "");
+                            }
+                        }
+                    }
+                }
+
                 if (_qz.tools.isVersion(2, 0)) {
                     /*
                     2.0.x conversion
diff --git a/src/qz/printer/action/PrintRaw.java b/src/qz/printer/action/PrintRaw.java
index d5e728768..675a3edaf 100644
--- a/src/qz/printer/action/PrintRaw.java
+++ b/src/qz/printer/action/PrintRaw.java
@@ -285,6 +285,9 @@ private ImageWrapper getWrapper(BufferedImage img, JSONObject opt, PrintOptions.
                     case "single": density = 32; break;
                     case "double": density = 33; break;
                     case "triple": density = 39; break;
+                    // negative: legacy mode
+                    case "single-legacy": density = -32; break;
+                    case "double-legacy": density = -33; break;
                 }
             } else {
                 density = 32; //default
diff --git a/src/qz/printer/action/raw/ImageWrapper.java b/src/qz/printer/action/raw/ImageWrapper.java
index 3330ae3b4..7ea4514de 100644
--- a/src/qz/printer/action/raw/ImageWrapper.java
+++ b/src/qz/printer/action/raw/ImageWrapper.java
@@ -85,6 +85,8 @@ public class ImageWrapper {
     private boolean igpDots = false; // PGL only, toggle IGP/PGL default resolution of 72dpi
     private int dotDensity = 32;  // Generally 32 = Single (normal) 33 = Double (higher res) for ESC/POS.  Irrelevant for all other languages.
 
+    private boolean legacyMode = false; // Use newlines for ESC/POS spacing; simulates <=2.0.11 behavior
+
     /**
      * Creates a new
      * <code>ImageWrapper</code> from a
@@ -199,7 +201,8 @@ public int getDotDensity() {
     }
 
     public void setDotDensity(int dotDensity) {
-        this.dotDensity = dotDensity;
+        this.legacyMode = dotDensity < 0;
+        this.dotDensity = Math.abs(dotDensity);
     }
 
     public void setLogoId(String logoId) {
@@ -590,6 +593,11 @@ private void appendEpsonSlices(ByteArrayBuilder builder) {
         boolean stripe = dotDensity == 1;
         int bytesNeeded = (dotDensity <= 1 || stripe)? 1:3;
 
+        if(legacyMode) {
+            // Temporarily set line spacing to 24 dots
+            builder.append(new byte[] { 0x1B, 0x33, 24});
+        }
+
         int offset = 0; // keep track of chunk offset currently being written
         boolean zeroPass = true; // track if this segment get rewritten with 1 pixel offset, always true if not striping
 
@@ -631,11 +639,21 @@ private void appendEpsonSlices(ByteArrayBuilder builder) {
 
                 zeroPass = !zeroPass;
             } else {
-                //shift down for next segment
-                builder.append(new byte[] {0x1B, 0x4A, (byte)segmentHeight});
+                if(legacyMode) {
+                    // render a newline to bump the print head down
+                    builder.append(new byte[] {10});
+                } else {
+                    //shift down for next segment
+                    builder.append(new byte[] {0x1B, 0x4A, (byte)segmentHeight});
+                }
                 offset += 8 * bytesNeeded;
             }
         }
+
+        if(legacyMode) {
+            // Restore line spacing to 30 dots
+            builder.append(new byte[] { 0x1B, 0x33, 30});
+        }
     }
 
     private ArrayList<float[]> convertToCYMK() throws IOException {