bug#38497: 27.0.50; Frame is not rendered when frame-resize-pixelwise it 't

[Ihor Radchenko]

> Maybe a conversion problem.  Does
>
>    ew->core.width = (frame_resize_pixelwise
>                   ? (Dimension) FRAME_PIXEL_WIDTH (f)
>                   : pixel_width);
>    ew->core.height = (frame_resize_pixelwise
>                    ? (Dimension) FRAME_PIXEL_HEIGHT (f)
>                    : pixel_height);
>
> yield better results?

It makes no difference.

> ... If not, can you tell me the four values here
> when it fails to redraw - that of FRAME_PIXEL_WIDTH (f), pixel_width,
> FRAME_PIXEL_HEIGHT (f) and pixel_height.

Not sure how to get those.
Anyway, the problem does not seem to be related to the code above.

> This one
>
> -              XtNwidthInc, (XtArgVal) (frame_resize_pixelwise ? 1 : cw),
> -              XtNheightInc, (XtArgVal) (frame_resize_pixelwise ? 1 : ch),
> +              XtNwidthInc, (XtArgVal) (cw),
> +              XtNheightInc, (XtArgVal) (ch),
>
> is more mysterious.  Why should 1 fail here?  What happens when you do
>
>    cw = frame_resize_pixelwise ? 1 : cw;
>    ch = frame_resize_pixelwise ? 1 : ch;
>    XtVaSetValues (wmshell,
>                XtNbaseWidth, (XtArgVal) base_width,
>                XtNbaseHeight, (XtArgVal) base_height,
>                XtNwidthInc, (XtArgVal) cw,
>                XtNheightInc, (XtArgVal) ch,
>                XtNminWidth, (XtArgVal) base_width,
>                XtNminHeight, (XtArgVal) base_height,
>                NULL);
>
> instead?

Actually, this piece of code seems to be a more specific reason
triggering the bug (see the relevant patch attached - that patch makes
the bug disappear). 

I tried your suggestion (no idea how it is different from original code
though). It makes no difference.

A possible hint to why this code fails to resize the frame is that my
WM resizes the frame as soon as it is created. It is not a gradual
resizing with mouse, but rather instant resize to pre-calculated size
(according to layout). I can sometimes even see the frame being created
with much smaller size for a split second followed by resizing it to
target size.

Best,
Ihor

diff --git a/src/widget.c b/src/widget.c
index e8eaf0fadf..4c00e35333 100644
--- a/src/widget.c
+++ b/src/widget.c
@@ -315,8 +315,8 @@ update_wm_hints (EmacsFrame ew)
   XtVaSetValues (wmshell,
                 XtNbaseWidth, (XtArgVal) base_width,
                 XtNbaseHeight, (XtArgVal) base_height,
-                XtNwidthInc, (XtArgVal) (frame_resize_pixelwise ? 1 : cw),
-                XtNheightInc, (XtArgVal) (frame_resize_pixelwise ? 1 : ch),
+                XtNwidthInc, (XtArgVal) (cw),
+                XtNheightInc, (XtArgVal) (ch),
                 XtNminWidth, (XtArgVal) base_width,
                 XtNminHeight, (XtArgVal) base_height,
                 NULL);




martin rudalics <rudalics@gmx.at> writes:

>  > The attached patch is the minimal patch making the rendering issue
>  > disappear.
>
> Thank you.
>
>  > Also, I cannot reproduce the issue when I try to configure
>  > emacs just with ./configure --with-x-toolkit=lucid. The options I used
>  > to compile emacs in my OS (I am using gentoo) are
>  >
>  > ./configure --prefix=/usr --build=x86_64-pc-linux-gnu
>  > --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
>  > --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
>  > --localstatedir=/var/lib --disable-silent-rules
>  > --docdir=/usr/share/doc/emacs-vcs-27.0.9999
>  > --htmldir=/usr/share/doc/emacs-vcs-27.0.9999/html --libdir=/usr/lib64
>  > --program-suffix=-emacs-27-vcs --includedir=/usr/include/emacs-27-vcs
>  > --infodir=/usr/share/info/emacs-27-vcs --localstatedir=/var
>  > --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
>  > --without-compress-install --without-hesiod --without-pop
>  > --with-dumping=pdumper --with-file-notification=inotify --enable-acl
>  > --with-dbus --with-modules --without-gameuser --with-libgmp --with-gpm
>  > --without-json --without-kerberos --without-kerberos5 --with-lcms2
>  > --with-xml2 --without-mailutils --without-selinux --with-gnutls
>  > --without-libsystemd --with-threads --without-wide-int --with-zlib
>  > --with-sound=alsa --with-x --without-ns --without-gconf
>  > --without-gsettings --without-toolkit-scroll-bars --with-gif --with-jpeg
>  > --with-png --with-rsvg --with-tiff --with-xpm --with-imagemagick
>  > --with-xft --with-cairo --without-harfbuzz --without-libotf
>
> Is it a good idea to build with xft _and_ cairo?  And what's bad
> about libotf?
>
>  > --without-m17n-flt --with-x-toolkit=lucid --with-xaw3d
>
> -  ew->core.width = (frame_resize_pixelwise
> -                 ? FRAME_PIXEL_WIDTH (f)
> -                 : pixel_width);
> -  ew->core.height = (frame_resize_pixelwise
> -                  ? FRAME_PIXEL_HEIGHT (f)
> -                  : pixel_height);
> +  ew->core.width = (pixel_width);
> +  ew->core.height = (pixel_height);
>
> Maybe a conversion problem.  Does
>
>    ew->core.width = (frame_resize_pixelwise
>                   ? (Dimension) FRAME_PIXEL_WIDTH (f)
>                   : pixel_width);
>    ew->core.height = (frame_resize_pixelwise
>                    ? (Dimension) FRAME_PIXEL_HEIGHT (f)
>                    : pixel_height);
>
> yield better results?  If not, can you tell me the four values here
> when it fails to redraw - that of FRAME_PIXEL_WIDTH (f), pixel_width,
> FRAME_PIXEL_HEIGHT (f) and pixel_height.
>
> This one
>
> -              XtNwidthInc, (XtArgVal) (frame_resize_pixelwise ? 1 : cw),
> -              XtNheightInc, (XtArgVal) (frame_resize_pixelwise ? 1 : ch),
> +              XtNwidthInc, (XtArgVal) (cw),
> +              XtNheightInc, (XtArgVal) (ch),
>
> is more mysterious.  Why should 1 fail here?  What happens when you do
>
>    cw = frame_resize_pixelwise ? 1 : cw;
>    ch = frame_resize_pixelwise ? 1 : ch;
>    XtVaSetValues (wmshell,
>                XtNbaseWidth, (XtArgVal) base_width,
>                XtNbaseHeight, (XtArgVal) base_height,
>                XtNwidthInc, (XtArgVal) cw,
>                XtNheightInc, (XtArgVal) ch,
>                XtNminWidth, (XtArgVal) base_width,
>                XtNminHeight, (XtArgVal) base_height,
>                NULL);
>
> instead?
>
> martin