first commit

app.py

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+# app.py
+from io import BytesIO
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel, Field
+from typing import List
+from PIL import Image, ImageOps
+
+import treepoem
+from brother_ql.raster import BrotherQLRaster
+from brother_ql.conversion import convert
+from brother_ql.backends.helpers import send
+
+if not hasattr(Image, "ANTIALIAS"):
+    Image.ANTIALIAS = Image.Resampling.LANCZOS
+
+app = FastAPI(title="QL-1060N Stacked Barcode Printer")
+
+
+class PrintRequest(BaseModel):
+    data: str = Field(..., description="String to encode")
+    printer_ip: str = Field(
+        "192.168.178.49", description="Brother QL-1060N IP on your LAN"
+    )
+    model: str = Field("QL-1060N", description="Brother model")
+    label: str = Field("12", description="12 mm continuous tape")
+
+
+def make_barcode_image(data: str, symb: str) -> Image.Image:
+    """Generate a monochrome barcode image via BWIPP."""
+    if symb == "code128":
+        img = treepoem.generate_barcode(
+            barcode_type="code128",
+            data=data,
+            options={"includetext": True, "height": "0.3"},
+            scale=3,
+        )
+    else:  # rectangular DataMatrix
+        img = treepoem.generate_barcode(
+            barcode_type="datamatrixrectangular",
+            data=data,
+            options={},
+            # options={"columns": "16", "rows": "48"},
+            scale=3,
+        )
+    return img.convert("1")
+
+
+def compose_label(images: List[Image.Image]) -> Image.Image:
+    """
+    Horizontally stack each barcode image with padding,
+    on a single monochrome canvas.
+    """
+    border = 10  # white border around each barcode
+    spacing = 20  # gap between them
+
+    # add border
+    framed = [ImageOps.expand(img, border=border, fill="white") for img in images]
+    max_h = max(img.height for img in framed)
+    total_w = sum(img.width for img in framed) + spacing * (len(framed) - 1)
+
+    canvas = Image.new("1", (total_w, max_h), 1)
+    x = 0
+    for img in framed:
+        y = (max_h - img.height) // 2
+        canvas.paste(img, (x, y))
+        x += img.width + spacing
+
+    return canvas
+
+
+def send_to_printer(image: Image.Image, printer_ip: str, model: str, label: str):
+    """
+    Rasterize the PIL image for Brother QL and send it via network.
+    """
+    qlr = BrotherQLRaster(model)
+    qlr.exception_on_warning = True
+
+    instructions = convert(
+        qlr=qlr,
+        images=[image],
+        label=label,
+        rotate="90",
+        threshold=70.0,
+        dither=False,
+        compress=True,
+        cut=True,
+    )
+
+    send(
+        instructions=instructions,
+        printer_identifier=printer_ip,
+        backend_identifier="network",
+        blocking=True,
+    )
+
+
+@app.post("/print", summary="Print Code128 + DataMatrix side-by-side")
+def print_stacked(req: PrintRequest):
+    try:
+        code_img = make_barcode_image(req.data, "code128")
+        dm_img = make_barcode_image(req.data, "datamatrix_rect")
+        label_img = compose_label([code_img, dm_img])
+        send_to_printer(label_img, req.printer_ip, req.model, req.label)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+    return {
+        "status": "printed",
+        "model": req.model,
+        "label_width_mm": req.label,
+        "layout": "code128 + datamatrix side by side",
+    }