Merge pull request #92 from EmbroidePy/tatarize-spx

Spx Format (read)

Author: tatarize

pyembroidery/PyEmbroidery.py

@@ -50,6 +50,7 @@
 import pyembroidery.PngWriter as PngWriter
 import pyembroidery.SewReader as SewReader
 import pyembroidery.ShvReader as ShvReader
+import pyembroidery.SpxReader as SpxReader
 import pyembroidery.StcReader as StcReader
 import pyembroidery.StxReader as StxReader
 import pyembroidery.SvgWriter as SvgWriter
@@ -318,6 +319,14 @@ def supported_formats():
         "category": "embroidery",
         "reader": TapReader
     })
+    yield ({
+        "description": "Pfaff Embroidery Format",
+        "extension": "spx",
+        "extensions": ("spx"),
+        "mimetype": "application/x-spx",
+        "category": "embroidery",
+        "reader": SpxReader
+    })
     yield ({
         "description": "Data Stitch Embroidery Format",
         "extension": "stx",

pyembroidery/SpxReader.py

@@ -0,0 +1,17 @@
+from .ReadHelper import read_int_16be, read_int_8, signed8, signed16
+
+
+def read(f, out, settings=None):
+    f.seek(0x11E, 1)
+    while True:
+        b = bytearray(f.read(2))
+        if len(b) != 2:
+            break
+        dy = -signed16(read_int_16be(f))
+        dx = signed16(read_int_16be(f))
+        c = signed8(read_int_8(f))
+        dy -= c
+        b = bytearray(f.read(2))
+        if len(b) != 2:
+            break
+        out.stitch(dx, dy)