Write BMP data directly without using PIL

This allows us to drop a build-time dep.

.lgtm.yml

@@ -8,7 +8,6 @@ extraction:
       - python3-gi
       - libarchive-tools
       - libcogl-pango-dev
-      - python3-pil
       - python3-pip
       - python3-setuptools
       - python3-wheel

contrib/PKGBUILD

@@ -9,7 +9,7 @@ arch=('i686' 'x86_64')
 url='https://github.com/fwupd/fwupd'
 license=('GPL2')
 depends=('libgusb' 'modemmanager' 'tpm2-tss')
-makedepends=('meson' 'valgrind' 'gobject-introspection' 'gtk-doc' 'python-pillow' 'git'
+makedepends=('meson' 'valgrind' 'gobject-introspection' 'gtk-doc' 'git'
              'python-cairo' 'noto-fonts' 'noto-fonts-cjk' 'python-gobject' 'vala'
              'curl' 'polkit' 'gcab' 'xz')
 

contrib/ci/dependencies.xml

@@ -1092,24 +1092,6 @@
       <package />
     </distro>
   </dependency>
-  <dependency type="build" id="python3-pil">
-    <distro id="arch">
-      <package>python-pillow</package>
-    </distro>
-    <distro id="fedora">
-      <package>python3-pillow</package>
-    </distro>
-    <distro id="debian">
-      <control />
-      <package variant="x86_64" />
-      <package variant="s390x" />
-      <package variant="i386" />
-    </distro>
-    <distro id="ubuntu">
-      <control />
-      <package variant="x86_64" />
-    </distro>
-  </dependency>
   <dependency type="build" id="python3-requests">
     <distro id="fedora">
       <package />

contrib/fwupd.spec.in

@@ -89,7 +89,7 @@ BuildRequires: libqmi-devel >= 1.22.0
 
 %if 0%{?have_uefi}
 BuildRequires: efivar-devel >= 33
-BuildRequires: python3 python3-cairo python3-gobject python3-pillow
+BuildRequires: python3 python3-cairo python3-gobject
 BuildRequires: pango-devel
 BuildRequires: cairo-devel cairo-gobject-devel
 BuildRequires: freetype

plugins/uefi-capsule/make-images.py

@@ -16,6 +16,8 @@ import argparse
 import tarfile
 import math
 import io
+import struct
+
 from typing import Dict, Optional, Any
 
 import cairo
@@ -24,7 +26,6 @@ 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 languages(podir: str):
@@ -60,6 +61,33 @@ class PotFile:
                     continue
 
 
+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
+    )
+
+
 def main(args) -> int:
 
     # open output archive
@@ -164,20 +192,14 @@ def main(args) -> int:
                 fs.foreach(do_write, None)
                 img.flush()
 
-                # write PNG
-                with io.BytesIO() as io_png:
-                    img.write_to_png(io_png)
-                    io_png.seek(0)
-
-                    # convert to BMP and add to archive
-                    with io.BytesIO() as io_bmp:
-                        pimg = Image.open(io_png)
-                        pimg.save(io_bmp, format="BMP")
-                        filename = "fwupd-{}-{}-{}.bmp".format(lang, width, height)
-                        tarinfo = tarfile.TarInfo(filename)
-                        tarinfo.size = io_bmp.tell()
-                        io_bmp.seek(0)
-                        tar.addfile(tarinfo, fileobj=io_bmp)
+                # convert to BMP and add to archive
+                with io.BytesIO() as io_bmp:
+                    io_bmp.write(_cairo_surface_write_to_bmp(img))
+                    filename = "fwupd-{}-{}-{}.bmp".format(lang, width, height)
+                    tarinfo = tarfile.TarInfo(filename)
+                    tarinfo.size = io_bmp.tell()
+                    io_bmp.seek(0)
+                    tar.addfile(tarinfo, fileobj=io_bmp)
 
     # success
     return 0

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:

snap/snapcraft.yaml

@@ -163,7 +163,6 @@ parts:
     stage-packages:
       - python3-gi
       - python3-gi-cairo
-      - python3-pil
     prime:
       - -etc
       - -usr