| Commit message (Collapse) | Author | Age | Files | Lines |
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- GLX backend: Add --glx-copy-front, which copies all unmodified regions
from front buffer to back buffer instead of redrawing the whole
screen. Unfortunately, probably because glCopyPixels() isn't usually
well-optimized on graphic cards, this option appears very unstable in
its effect: Over 20% boost in performance when only 1/4 of the screen
is modified, but 10% decrease when the whole screen is. Thus, not
enabled by default.
- GLX backend: Add glx_blur_dst(), to prepare for the background blur
feature. It currently is capable to modify background in the desired
way, but the core blur shader is absent. glConvolution2D() seemingly
relies entirely on CPU and has horrifying performance. I've hesitating
about whether I should use ARB assembly language or GLSL for the
shader.
- GLX backend: Invert y-axis GL matrix. It's upside-down previously
because that's what dcompmgr uses. Seemingly a "normal" y-axis is
required for glCopyPixels() to operate correctly.
- GLX backend: Fix some GLX_TEXTURE_RECTANGLE compatibility issues.
Still, not actually tested.
- Add benchmark mode (--benchmark & --benchmark-wid).
- Misc changes.
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- GLX backend: Use GL_SCISSOR_TEST instead of STENCIL_TEST if there's
only one rectangle in glx_set_clip(). Profiling with gDebugger shows a
10% performance improvement.
- Add .desktop installation rules. (#97)
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- GLX backend: Fix a bug that ARGB windows / shadows are rendered too
dark. Thanks to derhass in FreeNode/##opengl for help.
- GLX backend: Fix a problem that during window resize the content looks
jittering, by letting compton fetch pixmap sizes with XGetGeometry()
instead of relying on window width/height, which could be inaccurate
during window resize. Negative effect on performance. Thanks to M4he
for reporting. (#7)
- Add .desktop file. Thanks to quequotion for providing it. (#97)
- Avoid checking presence of window pixmap, because they may not exist
with very old X Composite implementations.
- Add workaround for a strange window restack issue when compton
receieves a ConfigureNotify with non-existent new above window.
- Add debugging function hexdump(). Extra sanity checks on various
places.
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- GLX backend: Fix a bug that window content does not get updated on
VirtualBox, by rebinding texture when window content changes. This may
have a negative effect on performance.
- GLX backend: Add --glx-no-stencil to restore the old clipping method,
just in case.
- GLX backend: Apply stricter checks on texture-pixmap binding.
- GLX backend: Fix a bug that glx_set_clip() behaves incorrectly when
None is passed in.
- GLX backend: Use glEnable()/glDisable() to toggle stencil tests, in
hope to increase performance.
- Move window pixmap/picture fetching to win_paint_win(), in hope to
increase performance.
- Intersect shadow painting region with its bounding rectangle, in hope
to increase performance.
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- Fix a bug that glx_bind_pixmap() doesn't work with mesa drivers.
Thanks to Janhouse and mkraemer for reporting. (#7)
- Use stencil buffer to attempt to eliminate potential double-paint
issue in glx_render(). X Fixes doesn't guarantee the rectangles in a
region do not overlap, and this may cause some regions to be painted
twice, which would be a problem if we are painting transparent things.
Now the target window must have a stencil buffer. Compiz uses its own
region implementation to deal with this, but as a lightweight
compositor we can't really do the same. It may have a positive or
negative effort over performance. Callgrind result indicates basically
no change in performance, but this may or may not be true.
- Correctly distinguish GL extensions and GLX extensions. Sorry. :-D
- Handle screen size. Thanks to tsmithe for reporting. (#7)
- Rename OpenGL backend to GLX backend, because, we might have a EGL
backend someday.
- Add configuration file option `backend` to specify backend. Add
`backend` to D-Bus `opts_get`.
- Add OpenGL shader compilation code, but currently unused.
- Minor adjustments.
- Known issue: Window content doesn't get updated in VirtualBox,
probably because its OpenGL implementation requires constant rebinding
of texture. But that's really slow...
- Known issue: Blur feature is still unimplemented in GLX backend.
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- Add experimental OpenGL backend (--opengl). --blur-background is
currently not possible with this backend, because I'm still trying to
find a proper way to do blur with OpenGL. Flipping backend on-the-fly
is really hard, so it isn't supported right now. No configuration file
option exists to enable this, because it isn't stable enough.
- Add `opengl-swc` VSync method that uses SGI_swap_control to control
buffer swap, with OpenGL backend. (#7)
- Fix a potential read-from-freed-memory issue in paint_all().
- Correctly reattach GLX context after fork.
- Dump error text in error(). Add GLX error code handling.
- Code clean-up.
- Known issues: Region operations take a lot of time in glx_render().
I'm hesitating about what to do.
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- Create OpenGL context only after initializing overlay, which fixes a
bug that --paint-on-overlay does not work with OpenGL VSync. Thanks to
tsmithe for reporting. (#7)
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- Add predefined matching target "argb" to match ARGB windows.
- Make it possible to enable focus tracking on-the-fly with D-Bus
method.
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- Fix an assertion failure that occurs when a window is reparented to
the root window then immediately to another window. Thanks to smlx for
reporting.
- Add extra debugging info for ReparentNotify.
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- #91: Use pkg-config to find drm.h to avoid issues on FreeBSD. Thanks
to hun7err for pointing out and providing patch.
- #89: Add default shadow exclusion rule for notify-osd. Thanks to
DanielRS.
- Check for abundant positional arguments.
- Use paint target window (root window / overlay window) instead of
ps->reg_win to create GLXContext. (May have negative effects on OpenGL
VSync.) Add new OpenGL helpers functions, to prepare for the new
OpenGL backend.
- Dump more info of a PropertyNotify with DEBUG_EVENTS.
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- Add on-the-fly VSync option modification via D-Bus, as requested by
kunitoki (#80). Expose parse_vsync(), create vsync_init() and
ensure_glx_context().
- Change default value of ps->drm_fd to -1.
- Update Makefile. Change the install/uninstall rules and add doc
installation, requested by hasufell in #85.
- Mark window not damaged in map_win(). It helps in reducing flickering
with inverted window color, but I'm not completely sure if it's safe.
- Avoid modifying w->invert_color when window is unmapped.
- Update documentation. Thanks to hasufell for pointing out.
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- Add "vsync-oml" VSync method, using GLX_OML_sync_control. Untested,
because it's not supported by my driver.
- Unredirect ps->reg_win, because DRI wiki says it's related to the
behavior of OpenGL VSync extensions.
- Add glFlush() and glXWaitX() calls, in hope they are slightly helpful
for VSync.
- Change a few functions to make error handling more graceful. Make some
errors fatal. Code clean-up.
- Add unused function make_text_prop().
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- Try to improve the performance of color inversion by applying clipping
region during color inversion. (#75)
- Validate pixmap on window unmap/destruction. Probably slightly helpful
for #52.
- Change the design of unmap_win() and destroy_win(), a bit.
- Add warning message to help messages about features disabled at
compile time, instead of dropping their description completely. (#85)
- Silence some warnings. Code clean-up.
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Conflicts:
src/compton.c
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- Add advanced window matching system, capable of matching against
arbitrary window properties as well as a series of internal
properties, with 4 additional operators (>, <, >=, <=) useful for
integer targets, and support of logical operators. The old matching
system is removed, but compatibility with the format is retained.
- As the new matching system is pretty complicated, and I have no past
experience in writing a parser, it's pretty possible that bugs are
present. It also has inferior performance, but I hope it doesn't
matter on modern CPUs.
- It's possible to disable matching system at compile time with NO_C2=1
now.
- Add ps->o.config_file to track which config file we have actually
read. Queryable via D-Bus.
- Parse -d in first pass in get_cfg() as c2 needs to query X to get
atoms during condition parsing.
- Fix a bug in wid_get_prop_adv() that 0 == rformat is not handled
correctly.
- Fix incompatibility with FreeBSD sed in dbus-examples/cdbus-driver.sh
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- Add recipe to generate .clang_complete in Makefile, used by Vim
clang_complete plugin.
- Add DEBUG_C2 for debugging condition string parsing. DEBUG_WINMATCH is
still used for match debugging.
- Rename win_on_wdata_change() to win_on_factor_change().
- Extra malloc() failure checks. Add const to matching cache members in
session_t. Code clean-up. Documentation update.
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- Fix a bug that root window is not repainted on wallpaper change unless
an Expose X event is received. Seemingly, if there's no mapped window
on a screen, X will not send an Expose event when the wallpaper
changes. Thanks to baskerville for reporting.
- Fix a X Pixmap leak when there's no existing wallpaper pixmap found.
- Fix a bug in mstrncpy() that null character is not added to the end of
the copied string.
- Make VSYNC_STRS public, for use in src/dbus.c. Adjust the type of
WINTYPES array. Add NUM_VSYNC.
- Add more targets for various D-Bus methods. Add "bad_target" D-Bus
error. Improve error handling. Add more helper functions to append
arguments to a D-Bus message. Add Introspect method to D-Bus
introspection reply.
- Add public declarations of things in the new condition format code to
common.h. Move definitions of some inline functions from compton.h to
common.h. Make some functions public. Move wid_get_prop_adv() to
compton.c. The primary code files of the new format src/c2.{c,h} will
be published when ready.
- Add support for dumping version string in Makefile (make version), to
make snapshot generation easier.
- Add repeated inclusion protection to common.h.
- Update documentation.
- Use gsed instead of sed in dbus-examples/cdbus-driver.sh if possible,
as some BSD systems does not come with GNU sed by default. Thanks to
DaChiChang for reporting.
- Code clean-up. Small type changes in register_cm() to silence
warnings. Quit on failure in parse_vsync(). Apply stricter checks in
force_repaint().
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- Add D-Bus support. Currently 7 methods are available: "reset" (same as
SIGUSR1), "list_win" (list the windows compton manages), "win_get"
(get a property of the window), "win_set" (set a property of the
window), "find_win" (find window based on client window / focus),
"opts_get" (get the value of a compton option), and "opts_set" (set
the value of a compton option), together with 4 signals: "win_added",
"win_destroyed", "win_mapped", "win_unmapped".
- D-Bus support depends on libdbus.
- As there are many items and my time is tight, no much tests are done.
Bugs to be expected.
- Create a new header file `common.h` that contains shared content.
- Fix some bugs in timeout handling.
- Update file headers in all source files.
- Re-enable --unredir-if-possible on multi-screen set-ups, as the user
could turn if off manually anyway.
- Check if the window is mapped in `repair_win()`.
- Add ps->track_atom_lst and its handlers, to prepare for the new
condition format.
- Known issue 1: "win_get", "win_set", "opts_get", "opts_set" support a
very limited number of targets only. New ones will be added gradually.
- Known issue 2: Accidental drop of D-Bus connection is not handled.
- Known issue 3: Introspection does not reveal all available methods,
because some methods have unpredictable prototypes. Still hesitating
about what to do...
- Known issue 4: Error handling is not finished yet. Compton does not
always reply with the correct error message (but it does print out the
correct error message, usually).
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- Fix a small bug that breaks --invert-color-include if no other
blacklists are present. Thanks to MaskRay and xiaq for reporting.
- Disable --unredir-if-possible for multi-screen setups.
- Fix a bug that causes --no-fading-openclose to have no effect in some
cases. Add w->in_openclose to keep track of window open/close state.
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- Add window color inversion (--invert-color-include). It means 2-3
times extra painting, so performance issues are likely to appear. I
hope I could find a faster way to invert colors.
- Rename some functions.
- Fix update of some window properties after window type/data change.
Hopefully this will be helpful for #73.
- Split win_build_picture() from win_blur_background().
- Correct memory leak of ps->focus_blacklist during reinitialization.
- Add win_upd_t and win_upd_run(), to reduce duplicate window property
updates. But is unused right now.
- Limited tests are done overall. Bugs to be expected.
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- Back to using select() for main loop. Thus we are not longer relying
on libevent.
- Add generic timeout system (untested) to prepare for D-Bus support.
- Drop troff man pages. Revise Makefile to improve documentation
building, fix double LDFLAGS inclusion, and re-add -lrt. This turns
asciidoc into a build time dependency.
- Change fading time calculation.
- Add --logpath and ostream_reopen() for debugging with -b.
- Drop unused lceil_ntimes() and other helper functions.
- Only very limited tests are done. Bugs to be expected.
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- (Hopefully) fix all incorrect handling of w->a.border_width in compton
(#77). Thanks to baskerville for reporting.
- Attempt to fix #73 by correcting a mistake that window data is fetched
from the wrong function. Thanks to zakkak.
- Add git commit/tag detection to Makefile for automatic versioning.
- Change -lGL linking order, to fix a segmentation fault caused by
something in nvidia-drivers under FreeBSD, mentioned in #74. Thanks
for the report from DachiChang.
- Link to -levent_core instead of -levent in Makefile. We might move to
libev soon, though.
- Increase SWOPTI_TOLERANCE to handle the extraordinary delay of
kqueue() under FreeBSD. Thanks for DachiChang's report.
- Add helper function dump_drawable() for debugging.
- Replace XInternAtom() calls with get_atom().
- Remove -lrt as it's unneeded.
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- Use libevent for main loop. I will explain the reasons in #56 later.
The preferred libevent version is 2.x, yet 1.4.x should work as well.
- As a result, compton now should build fine on *BSD. Thanks to
DachiChang for the FreeBSD build issue report.
- Another consequence is we now use microsecond-level timing all the
way. Nanosecond-level code will be dropped soon. Start using long
instead of unsigned long to represent time in milliseconds, as both
can't hold the full epoch time in ms, anyway, and a signed type
requires less care in subtraction. Wrap the epoch time in ms to 15
days.
- Fix broken NO_VSYNC_DRM and NO_VSYNC_OPENGL compile-time options.
- Use git revision number for versioning in Makefile, and other small
improvements.
- Reorganize struct _win. Drop unused w->damaged_sequence. w->damaged is
turned to bool.
- Add type and format to winprop_t, as preparation for the new condition
format.
- Add w->shadow_force and w->focus_force, to prepare for D-Bus support.
- Rename wid_get_prop() to wid_get_prop_adv() with more options. Add
wrapper function wid_get_prop().
- Add some extra helper functions, for D-Bus support later.
- Make some functions return a bool value to indicate if it's
successful.
- Modify add_win(), use a static const structure to initialize the new
struct _win.
- Add some helper macros, like printf_err(f)(q). Make some errors fatal.
- Rename some types, constants, and functions. Code clean-up.
- Check for time disorder in paint_preprocess() when calculating fading
steps.
- Rename evpoll() to swopti_handle_timeout(), and partially rewrite it.
- Make -h / --help legal.
- Known issue: compton segfaults on FreeBSD with nvidia-drivers, unless
NO_VSYNC_OPENGL is used. Will look into it later. Thamls to DachiChang
for reporting.
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- Remove the region expansion design in win_blur_background(). I must be
sleep-walking when I wrote that!
- Improve performance of blurring when a window is opaque but its frame
is transparent.
- Adjust blur strength according to window opacity.
--blur-background-fixed restores the old behavior.
- Add "use_offset" parameter to a few functions for convenience. Code
clean-up.
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- Add window background blur support (--blur-background &
--blur-background-frame), with X Render convolution filter.
The performance sucks. The performance when the window is opaque but
frame is transparent could be improved, but there are two possible
ways and I'm hesitating.
- Known issue: The blurring effect looks very ungraceful during fading.
I could partially fix the problem, but it probably isn't easy to fix
it completely.
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- Move some long functions to ./src/compton.c .
- Fix a small potential issue in win_set_focused() when a window with
neither leader nor client window is focused.
- Add DEBUG_LEADER.
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- Add auxiliary window detection (--detect-transient &
--detect-client-leader). Thanks to SmilingHorse for inspiring me. The
implementation is not too speed-efficient, and bugs are to be
expected.
- Known issue: auxiliary window detection may not work too well with
windows that are never mapped, for example as client leader.
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- Add "focus" to the wintypes settings in compton.conf, to mark windows
of certain window types to be always focused. Replaces the ugly
is_normal_win().
- Add a ON/OFF/UNSET switch_t type, but it's unused currently.
- Mark client_win if the window client detection hasn't been performed
when we detect WM_STATE's presence in ev_property_notify(), for
performance.
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- Attempt to fix client window detection when WM_STATE property is not
yet set when the window is mapped. Thanks to kinclma1 for reporting.
- Apply stricter checks for whether window is mapped in
determine_evmask() and win_mark_client().
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- Note I'm not in the best state today (bad cold & sleep-deprived). This
commit is likely to introduce bugs.
- Attempt to fix client window detection failures happening when compton
searches for client window before it's ready.
- Fix build failure with <libpcre-8.20. Thanks to @pvanek for reporting
in #51.
- Move client window detection to a new function win_recheck_client().
- Add win_unmark_client(), which unmarks a client window.
- Rename a few functions.
- Split fetching of values of type-Window properties to a new function
wid_get_prop_window().
- Add extra safety checks and assert calls to various functions, to
expose potential bugs.
- Fix a memory leak that w->role is not freed on window destruction.
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- Add support of matching WM_WINDOW_ROLE value. Thanks to Vladimir A.
Pavlov!
- Thanks to Vladimir A. Pavlov for reporting the issues caused by
missing client window, fixed in the last commit!
- Fix a memory leak in wid_get_text_prop() and wid_get_name(). Xlib
documentation did not mention how to free the value XGetTextProperty()
returns, so my fix could lead to troubles.
- Set focus out in unmap_win(), and add w->leader, to prepare for
subsidiary window detection.
- Abstract update of a single string window property to
win_get_prop_str().
- Change wid_get_name() to rely on wid_get_text_prop() as much as
possible.
- Correct a typo in win_get_prop_str() that could cause unnecessary
update of shadow state and window focus.
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- Make inactive_dim opacity change according to window opacity by
default, so it looks better when fading. --inactive-dim-fixed restores
the old behavior.
- Make client window default to the window itself. Add w->wmwin to
represent whether the window looks like a WM window instead. A side
effect is, the window type of WM windows are changed from unknown to
normal, making it necessary to use --mark-wmwin-active to avoid
considering them unfocused.
- Add check of PointerRoot to recheck_focus() to avoid BadWindow errors
when the root window is focused.
- Add a few macros to simplify debugging code.
- Add DEBUG_FRAME.
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- Add --focus-exclude, which should be used with a list of conditions to
set certain windows to always be considered focused.
- Change focus determination process, with a newly added w->focused_real
that reflects whether the window is actually focused, while w->focused
represents whether compton considers it focused. The primary
difference is now when a window considered focused because of
--mark-wmwin-focused or --mark-ovredir-focused receives a FocusOut
event, it's still considered focused by compton.
- Change opacity target and dim state calculation so that it's done at
most once every paint.
- Split window opacity property fetching from calc_opacity() to a new
function win_update_opacity_prop().
- Silence a warning in wid_get_prop_wintype().
- Rename a few functions. Code clean-up.
- My time is very limited currently, few tests are done, so this commit
may very well introduce bugs.
- Known issue: Dim picture opacity does not change based on window
opacity, causing somehow annoying effects when a window fades off.
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- Fix a bug that causes wrong focus detection result in Awesome and
maybe other window managers, when --use-ewmh-active-win is enabled and
_NET_ACTIVE_WINDOW changes before the newly-focused window is mapped.
- Fix a typo that causes more than one window to stay focused after a
window destruction with --use-ewmh-active-win.
- Fix a bug that find_clientwin() incorrectly returns a window when
window ID 0 is passed to it.
- Check for window ID 0 in update_ewmh_active_win().
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- Fix a bug that causes wrong file path being displayed on configuration
file parsing error.
- Continue dropping unused parameters and silence clang warnings.
- Add conky shadow exclusion rule to compton.sample.conf.
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- Create a session_t structure, to get rid of most global variables and
let information pass in/out mostly through parameters. Huge changes,
so bugs may very well appear. I'm worried about resource leakages, in
particular.
- Add gcc attributes on various functions.
- Add Doxygen configuration.
- Replace much Xlib Bool with C99 bool.
- Add and adjust some comments.
- Drop unused parameters from some functions.
- Cache default Visual and Depth, mainly to shorten code.
- Rename some types, variables, and functions.
- Add win_ev_stop() and set_ignore_next() for convenience.
- Modify wid_get_prop_wintype() and wid_get_opacity_prop() to use
wid_get_prop().
- Rename --respect-attr-shadow to --respect-prop-shadow.
- Fix a memory leak in --respect-prop-shadow.
- Many other small changes.
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- Form a function ev_window_name() for all window name detection in
debugging code.
- Add unredir-if-possible to configuration file options.
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- Fix a bug that client window event masks are not restored in
map_win(), causing further property changes to be ignored, for
example.
- Misc changes.
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- Optionally unredirect windows when there's a fullscreen opaque window on
the top of the stack (--unredir-if-possible). Experimental. Known
issues:
* Screen flickers when redirecting/unredirecting windows.
--paint-on-overlay seemingly minimizes it (Thanks for hints from
mutter), but still noticeable.
* It probably does not play well with vdpau in some cases.
- A debug option DEBUG_REDIR is added.
- Fix a bug that reg_ignore are not expired when a CirculateNotify is
received.
- Add extra safe guards in some places, which could be bad for
performance.
- Remove some abundant code.
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- Add support for reading _COMPTON_SHADOW property from windows
(--respect-attr-shadow). Presently the only defined behavior is, if
_COMPTON_SHADOW is set on the highest ancestor below root window of a
window (usually the WM frame), it's format is 32-bit, type is CADINAL,
value is 0, the window will not get a shadow. The format and behavior
could change in the future without prior notification.
- Fix an issue in fork_after() that may cause some streams to remain
open. My mistake.
- Attempt to reduce determine_shadow() calls from map_win() by
separating some raw handler functions out.
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- Fix a bug that causes rendering issues if a opaque window changes
shape.
- Remove abundant handling code in paint_preprocess() when generating
border_size as border_size() is no longer relying on
XFixesCreateRegionFromWindow() right now by default.
- Add extra code to print backtrace in DEBUG_ALLOC_REG.
- Move initialization of fade_time closer to first paint.
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- Fix a bug that window content and some borders are not rendered if the
window has no border on particular sides when -e (frame-opacity) is
enabled, introduced in 66d3f30978. Just as what I said in the commit
message of the commit, "bugs are to be expected". :-S
- Fix a potential segfault in win_match().
- Slightly update CPackConfig.cmake to add dependency to libdrm.
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- Silence a FORTIFY_SOURCE warning. Thanks to @smlx for reporting.
- Add -O2 -D_FORTIFY_SOURCE=2 to default CFLAGS in Makefile.
- Use a cleaner way to resolve the writing-to-freed-memory issue
mentioned in last commit.
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- Add support for using _NET_WM_ACTIVE_WINDOW to track focus (rather
than using FocusIn/Out events) as --use-ewmh-active-win.
- Add wid_get_attr() and use it in place of XGetWindowProperty() in
various places.
- Remove dpy parameter from find_win() and find_toplevel() as it's unused.
- Fix a writing-to-freed-memory issue in paint_preprocess().
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- Change focus detection to filter FocusIn/Out events in an alternative
way. Could break things, and may be revoked in the future.
- Change --mark-ovredir-focused's semantics. Now it determines whether a
window is to be unconditionally focused by checking if its client
window is the window itself. This resolves a problem in window
managers that set frame windows to be override-redirected (Fluxbox and
i3?). Yes, I know it's bad to change semantics in this way.
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- Fix a XserverRegion leak introduced in b78ab316fd. I hope this is the
reason of the slowdowns many users reported. Thanks to xrestop!
- Cache the screen region as a variable.
- Add debugging code for region allocation.
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- Merge @daBrado's focus event debugging code. Thanks!
- Use macro to reduce code redundancy in various functions.
- Move focus event validation from ev_focus_out() to a separate
function.
- Add logic in ev_handle() to increase the chance of successful window
name detection if compton is not reading window names normally (i.e.
if there's no --shadow-exclude), when DEBUG_EVENTS is on.
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- Correct design mistakes in win_get_region_noframe(). I must be
sleepwalking when I wrote that thing!
- Intersect border_size with window region rectangle because Openbox is
offering wrong window shapes larger than the window rectangle for shaped
windows. Shame on you, Openbox.
- Change logic in reg_ignore calculation as border_size is now
intersected with window rectangle and we don't need to do this here
again.
- Rewrite window painting with frame opacity part in win_paint_win() to
deal with absurd frame widths WM offers. Again, Openbox, this is your
fault.
- As I'm in a pretty bad state (continuously working on compton for 10+
hours without rest...), all these changes are not well tested, and
bugs are to be expected.
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- Run XSync() before the final paint to catch VBlank better. Stolen from
Xfwm4 VSync patch.
- Add --vsync-aggressive that sends out the final painting request
earlier, simulating xfwm4 VSync patch. But this thing does have the
possibility of breaking VSync, I think...
- Change handling of ConfigureNotify to avoid freeing w->extents and
w->border_size if possible.
- Change logic in paint_prepreprocess() to use win_get_region() for
border_size generation instead of border_size() if the window is not
shaped to try to avoid some BadRegion error messages when a window
loses its border_size then is unmapped, about which Adys complained in
#25.
- Detect if w->border_size is None before using it in various places.
Practically the effect is pretty limited because
XFixesCreateRegionFromWindow() usually returns an invalid X ID instead
of None on error.
- Fix a bug that rounded corner detection could fail if the window size
is changed by a ConfigureNotify immediately.
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- Try to reduce regenerations of reg_ignore. Highly experimental and
could lead to very obscure bugs. More testing needed.
- Introduce to_paint in struct _win to keep track of whether this window
was painted last time.
- Drop CAN_DO_USABLE support. Its usage looks pretty limited.
- Fix a bug that possibly causes rendering issues on frame width changes
if frame_opacity is enabled.
- Detect other borders (instead of only top border) when determining
frame opacity.
- Change the type of w->mode from int to an enumeration type.
- Ignore ShapeNotify if the window is not mapped, to avoid loss of
w->border_size in some cases, which breaks the fading out process of
shaped windows.
- Stop rendering a window if its picture is lost and it's unmapped, to
avoid a series of X errors and possible rendering problems.
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