Added ability to configure ZBar options per symbol

README.rst

@@ -192,6 +192,30 @@ symbol types
    >>> decode(Image.open('pyzbar/tests/qrcode.png'), symbols=[ZBarSymbol.CODE128])
    []
 
+To change any of the other ZBar default settings found in `pyzbar.wrapper.ZBarConfig
+<https://github.com/NaturalHistoryMuseum/pyzbar/blob/master/pyzbar/wrapper.py>`__ just pass
+a config object to the ``decode`` method
+
+::
+
+    >>> from pyzbar.pyzbar import ZBarSymbol
+    >>> from pyzbar.pyzbar import ZBarConfig
+    >>> # Build config object
+    >>> config = {}
+    >>> config[ZBarSymbol.I25] = {ZBarConfig.CFG_MIN_LEN: 2}  # change min code length for I25 codes to 2 digits, ZBar defaults to 6
+    >>> decode(Image.open('pyzbar/tests/short_codeI25.png'), config=config)
+    [
+        Decoded(
+            data=b'75',
+            type='I25',
+            rect=Rect(left=1, top=0, width=52, height=56),
+            polygon=[
+                Point(x=1, y=1), Point(x=1, y=55), Point(x=53, y=56),
+                Point(x=53, y=0)
+            ]
+        )
+    ]
+
 Bounding boxes and polygons
 ---------------------------
 

pyzbar/pyzbar.py

@@ -167,13 +167,15 @@ def _pixel_data(image):
     return pixels, width, height
 
 
-def decode(image, symbols=None):
+def decode(image, symbols=None, config=None):
     """Decodes datamatrix barcodes in `image`.
 
     Args:
         image: `numpy.ndarray`, `PIL.Image` or tuple (pixels, width, height)
         symbols: iter(ZBarSymbol) the symbol types to decode; if `None`, uses
             `zbar`'s default behaviour, which is to decode all symbol types.
+        config: dict(ZBarSymbol: dict(ZBarConfig: value)) per-symbol config
+            options to change default ZBar settings
 
     Returns:
         :obj:`list` of :obj:`Decoded`: The values decoded from barcodes.
@@ -197,6 +199,15 @@ def decode(image, symbols=None):
                 zbar_image_scanner_set_config(
                     scanner, symbol, ZBarConfig.CFG_ENABLE, 1
                 )
+
+        # Set per-symbol config options for the scanner
+        if config:
+            for symbol, options in config.items():
+                for option, value in options.items():
+                    zbar_image_scanner_set_config(
+                        scanner, symbol, option, value
+                    )
+
         with _image() as img:
             zbar_image_set_format(img, _FOURCC['L800'])
             zbar_image_set_size(img, width, height)

pyzbar/tests/test_pyzbar.py

@@ -19,7 +19,7 @@
     cv2 = None
 
 from pyzbar.pyzbar import (
-    decode, Decoded, Rect, ZBarSymbol, EXTERNAL_DEPENDENCIES
+    decode, Decoded, Rect, ZBarSymbol, ZBarConfig, EXTERNAL_DEPENDENCIES
 )
 from pyzbar.pyzbar_error import PyZbarError
 
@@ -66,11 +66,19 @@ class TestDecode(unittest.TestCase):
             polygon=[(32, 352), (177, 366), (190, 222), (46, 208)])
     ]
 
+    EXPECTED_CODEI25 = [
+        Decoded(
+            data=b'75',
+            type='I25',
+            rect=Rect(left=1, top=0, width=52, height=56),
+            polygon=[(1, 1), (1, 55), (53, 56), (53, 0)])
+    ]
+
     def setUp(self):
-        self.code128, self.qrcode, self.qrcode_rotated, self.empty = (
+        self.code128, self.qrcode, self.qrcode_rotated, self.empty, self.codei25 = (
             Image.open(str(TESTDATA.joinpath(fname)))
             for fname in
-            ('code128.png', 'qrcode.png', 'qrcode_rotated.png', 'empty.png')
+            ('code128.png', 'qrcode.png', 'qrcode_rotated.png', 'empty.png', 'short_codeI25.png')
         )
         self.maxDiff = None
 
@@ -93,6 +101,13 @@ def test_decode_qrcode_rotated(self):
         res = decode(self.qrcode_rotated)
         self.assertEqual(self.EXPECTED_QRCODE_ROTATED, res)
 
+    def test_config(self):
+        "Read a 2-digit I25 barcode (ZBar defaults to min 6 digits for I25)"
+        config = {}
+        config[ZBarSymbol.I25] = {ZBarConfig.CFG_MIN_LEN: 2}
+        res = decode(self.codei25, config=config)
+        self.assertEqual(self.EXPECTED_CODEI25, res)
+
     def test_symbols(self):
         "Read only qrcodes in `qrcode.png`"
         res = decode(self.qrcode, symbols=[ZBarSymbol.QRCODE])