dev 0.2.1 [ci skip]

Author: bigcat88

.pre-commit-config.yaml

@@ -31,6 +31,3 @@ repos:
      -  id: mypy
         files: pillow_heif/
         additional_dependencies: [pillow, cffi, pytest]
-
-default_language_version:
-    python: python3.9

docs/BUILDING.md

@@ -39,9 +39,10 @@ pip3 install --no-binary pillow_heif
 ```
 
 ### Windows
+By default, build script assumes that `vcpkg` builds libs in `C:\vcpkg\installed\x64-windows`.
+If not, then set `VCPKG_PREFIX` environment variable to your custom path, e.g. `setx VCPKG_PREFIX "D:\vcpkg\installed\x64-windows"`
 ```bat
 vcpkg install aom libheif --triplet=x64-windows
-VCPKG_PREFIX="path_to:vcpkg/installed/x64-windows"
 pip3 install --no-binary pillow_heif
 ```
 

libheif/build.py

@@ -1,6 +1,7 @@
 from os import getenv, path
 from subprocess import DEVNULL, PIPE, run
 from sys import platform
+from warnings import warn
 
 from cffi import FFI
 
@@ -35,6 +36,9 @@
         include_path_prefix = "/opt/local"
 elif platform.lower() == "win32":
     include_path_prefix = getenv("VCPKG_PREFIX")
+    if include_path_prefix is None:
+        include_path_prefix = "C:\\vcpkg\\installed\\x64-windows"
+        warn(f"VCPKG_PREFIX environment variable is not set. Assuming `VCPKG_PREFIX={include_path_prefix}`")
 else:
     include_path_prefix = build_libs.build_libs_linux()