commit 4706031223f6809b40ef7d4c3f14103941621d57
Author: Richard Hughes <richard@hughsie.com>
Date:   Fri Apr 9 15:20:13 2021 +0100

    Write BMP data directly without using PIL
    
    This allows us to drop a build-time dep.

diff --git a/po/make-images b/po/make-images
index b1097bc2..c3cad9e7 100755
--- a/po/make-images
+++ b/po/make-images
@@ -18,7 +18,6 @@ import gi
 gi.require_version('Pango', '1.0')
 gi.require_version('PangoCairo', '1.0')
 from gi.repository import Pango, PangoCairo
-from PIL import Image
 
 def usage(return_code):
     """ print usage and exit with the supplied return code """
@@ -29,6 +28,32 @@ def usage(return_code):
     out.write("usage: make-images <label text> <mo file directory> <LINGUAS> <installdir>")
     sys.exit(return_code)
 
+def _cairo_surface_write_to_bmp(img: cairo.ImageSurface) -> bytes:
+
+    data = bytes(img.get_data())
+    return (
+        b"BM"
+        + struct.pack(
+            "<ihhiiiihhiiiiii",
+            54 + len(data),  # size of BMP file
+            0,  # unused
+            0,  # unused
+            54,  # pixel array offset
+            40,  # DIB header
+            img.get_width(),  # width
+            -img.get_height(),  # height (top down)
+            1,  # planes
+            32,  # BPP
+            0,  # no compression
+            len(data),  # size of the raw bitmap data
+            2835,  # 72DPI H
+            2835,  # 72DPI V
+            0,  # palette
+            0,  # all colors are important
+        )
+        + data
+    )
+
 class Rasterizer:
     """ Rasterize some text """
 
@@ -140,11 +165,8 @@ class Rasterizer:
                 os.mkdir(d, 0o755)
             d = os.path.split(filename)[0]
             make_dir(d)
-            img.write_to_png(filename)
-            pimg = Image.open(filename)
-            img = pimg.copy()
-            del pimg
-            img.save(filename)
+            with open(filename, "wb") as f:
+                f.write(_cairo_surface_write_to_bmp(img))
 
         for lang in self.languages:
             #print("lang:\"%s\" string:\"%s\"" % (lang, string))
diff --git a/po/test-deps b/po/test-deps
index f5276daa..27b4055b 100755
--- a/po/test-deps
+++ b/po/test-deps
@@ -34,12 +34,6 @@ except ValueError:
     print("Error: missing cairo gobject introspection library")
     err = 1
 
-try:
-    from PIL import Image
-except ImportError:
-    print("Error: missing dependency python pillow (python3-pil)")
-    err = 1
-
 try:
     import cairo
 except ImportError: