Added compile-time mozjpeg feature flag

src/PIL/features.py

@@ -127,6 +127,7 @@ def get_supported_codecs() -> list[str]:
     "fribidi": ("PIL._imagingft", "HAVE_FRIBIDI", "fribidi_version"),
     "harfbuzz": ("PIL._imagingft", "HAVE_HARFBUZZ", "harfbuzz_version"),
     "libjpeg_turbo": ("PIL._imaging", "HAVE_LIBJPEGTURBO", "libjpeg_turbo_version"),
+    "mozjpeg": ("PIL._imaging", "HAVE_MOZJPEG", "libjpeg_turbo_version"),
     "zlib_ng": ("PIL._imaging", "HAVE_ZLIBNG", "zlib_ng_version"),
     "libimagequant": ("PIL._imaging", "HAVE_LIBIMAGEQUANT", "imagequant_version"),
     "xcb": ("PIL._imaging", "HAVE_XCB", None),
@@ -300,7 +301,8 @@ def pilinfo(out: IO[str] | None = None, supported_formats: bool = True) -> None:
             if name == "jpg":
                 libjpeg_turbo_version = version_feature("libjpeg_turbo")
                 if libjpeg_turbo_version is not None:
-                    v = "libjpeg-turbo " + libjpeg_turbo_version
+                    v = "mozjpeg" if check_feature("mozjpeg") else "libjpeg-turbo"
+                    v += " " + libjpeg_turbo_version
             if v is None:
                 v = version(name)
             if v is not None:

src/_imaging.c

@@ -76,6 +76,9 @@
 
 #ifdef HAVE_LIBJPEG
 #include "jconfig.h"
+#ifdef LIBJPEG_TURBO_VERSION
+#include "jpeglib.h"
+#endif
 #endif
 
 #ifdef HAVE_LIBZ
@@ -4367,6 +4370,15 @@ setup_module(PyObject *m) {
     Py_INCREF(have_libjpegturbo);
     PyModule_AddObject(m, "HAVE_LIBJPEGTURBO", have_libjpegturbo);
 
+    PyObject *have_mozjpeg;
+#ifdef JPEG_C_PARAM_SUPPORTED
+    have_mozjpeg = Py_True;
+#else
+    have_mozjpeg = Py_False;
+#endif
+    Py_INCREF(have_mozjpeg);
+    PyModule_AddObject(m, "HAVE_MOZJPEG", have_mozjpeg);
+
     PyObject *have_libimagequant;
 #ifdef HAVE_LIBIMAGEQUANT
     have_libimagequant = Py_True;