From 469ea1773b13ba0b25bc4121047faf4cc0d3b108 Mon Sep 17 00:00:00 2001
From: Mimoja <git@mimoja.de>
Date: Thu, 2 Oct 2025 14:08:12 +0200
Subject: [PATCH 1/2] label: add a helper function to check if an area of the
 label is empty

Signed-off-by: Mimoja <git@mimoja.de>
---
 src/js/labels.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/js/labels.js b/src/js/labels.js
index 8d7068c..eb1d328 100644
--- a/src/js/labels.js
+++ b/src/js/labels.js
@@ -29,6 +29,16 @@ export default function (labelType) {
     };
 }
 
+function isCanvasEmpty(ctx, x, y, width, height) {
+    const imgData = ctx.getImageData(x, y, width, height);
+    for (let i = 0; i < imgData.data.length; i += 4) {
+        if (imgData.data[i]!=0xFF || imgData.data[i+1]!=0xFF || imgData.data[i+2]!=0xFF) {
+            return false; // Found a non-transparent pixel
+        }
+    }
+    return true; // All pixels are transparent
+}
+
 const template = {
     file: {
         type: 'pdf',

From de59cfd4ec41cbe0e89a6b9e8ddebe7bd3ef40bb Mon Sep 17 00:00:00 2001
From: Mimoja <git@mimoja.de>
Date: Thu, 2 Oct 2025 14:09:00 +0200
Subject: [PATCH 2/2] label/dhl: add positional support for the changed
 BAHNTRANSPORT icon

Signed-off-by: Mimoja <git@mimoja.de>
---
 src/js/labels.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/js/labels.js b/src/js/labels.js
index eb1d328..4583380 100644
--- a/src/js/labels.js
+++ b/src/js/labels.js
@@ -81,6 +81,13 @@ const dhlPrivat = {
             2802, 679, 234, 154,
             666, 465, 152, 100);
 
+        // We didnt render any bahntransport label yet, lets try the second common position
+        if (isCanvasEmpty(ctx, 666, 465, 152, 100)) {
+            ctx.drawImage(image,   // Bahntransport v2
+                2763, 540, 250, 154,
+                666, 465, 152, 100);
+        }
+
         ctx.drawImage(image,   // Sendungsdaten
             1964, 933, 1124, 152,
             0, 576, 890, 120);