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authorDaniel Friesel <derf@finalrewind.org>2021-12-24 11:58:34 +0100
committerDaniel Friesel <derf@finalrewind.org>2021-12-24 11:58:34 +0100
commit2a9a7e2557407d5b0c7e6b9680828fb431776ff5 (patch)
treec3d3faa10d1450495fe7e1d9ba2fa8b30b1ba1c6 /src/options.c
parent7076b7a221768d5153130fe38d3b84f23d0a581d (diff)
Disable --auto-rotate in feh builds compiled wiht Imlib2 1.7.5+
Imlib2 v1.7.5 introduces automatic (and transparent) orientation adjustment based on EXIF orientation tags. This makes feh's --auto-rotate function both superfluous and erroneous: It doesn't know about Imlib2's adjustments, so it rotates an image which is already correctly oriented, leading to incorrect orientation. I am not aware of a simple run-time check for detecting whethen running Imlib2 < 1.7.5 or ≥ 1.7.5. For now, feh disables --auto-rotate entirely when compiled on a system with Imlib2 1.7.5+ and outputs a warning when the option is used. Rationale: The Imlib2 version available at run-time should in most cases be at least as recent as the Imlib2 version used at compile-time. So, while there may be cases where feh was compiled with Imlib2 1.7.4 and exhibits erroneous auto-rotate behaviour on an Imlib2 1.7.5 system, the inverse case (a feh with disabled auto-rotate support running on Imlib2 1.7.4) should be sufficiently rare. If it does occur, it can be remedied by compiling feh from source locally. Possible caveat: Imlib2 only adjusts for EXIF orientation when loading JPEG and TIFF images. If there are additional EXIF-aware file formats supported by feh, but not Imlib2, they lose auto-rotate support. Reference: GitHub issue #642
Diffstat (limited to 'src/options.c')
-rw-r--r--src/options.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/options.c b/src/options.c
index 4d1e527..71c65e2 100644
--- a/src/options.c
+++ b/src/options.c
@@ -758,7 +758,12 @@ static void feh_parse_option_array(int argc, char **argv, int finalrun)
opt.draw_exif = 1;
break;
case OPTION_auto_rotate:
+#if defined(IMLIB2_VERSION_MAJOR) && defined(IMLIB2_VERSION_MINOR) && defined(IMLIB2_VERSION_MICRO) && (IMLIB2_VERSION_MAJOR > 1 || IMLIB2_VERSION_MINOR > 7 || IMLIB2_VERSION_MICRO >= 5)
+ weprintf("This feh release was built with Imlib2 version %d.%d.%d, which transparently adjusts for image orientation according to EXIF data.", IMLIB2_VERSION_MAJOR, IMLIB2_VERSION_MINOR, IMLIB2_VERSION_MICRO);
+ weprintf("--auto-rotate would rotate an already correctly oriented image, resulting in incorrect orientation. It has been disabled in this build. Rebuild feh with Imlib2 <1.7.5 to enable --auto-rotate.");
+#else
opt.auto_rotate = 1;
+#endif
break;
#endif
case OPTION_no_xinerama: