gtk4: Update to 4.20.3

[lazka]

media backend modules got removed upstream and gstreamer is always linked now

rendering is broken, so can't be merged.

GDK_DISABLE=dcomp fixes some of it. video rending is broken still

<Company> lazka: yeah, I got halfway towards the D3D renderer, ie we manage to get dcomp working now but not d3d yet
<Company> so now we have gl on dcomp, which is a kinda bad combination
<Company> it might be worthwhile to skip 4.20 on Windows - or maybe patch out dcomp to get closer to the old rendering code
[...]
<Company> lazka: oh widget-factory - I think that's a GStreamer issue where the D3D12 code gets vp9 with alpha wrong, but I never got around to investigating that

theora BBB video is also broken, but h264 works.

[otaxhu]

Hi, I tested 4.20.2 tag in a Windows 10 VM and it works using Cairo backend and no extra arguments/env-variables, I found no rendering issues and no bugged shadows as displayed by this link you mentioned wingtk/gvsbuild#1641

Video player is not working though. I've never used the video player personally, so I don't know which commit is the most recent good one in order to do a git bisect, but if you have found the regression commit, please let me know :-)

Information displayed in Inspector's "Global" tab

General Information

Name	Value
Operating System	Windows 10 22H2
GTK Version	4.20.2
GDK Backend	Windows
GSK Renderer	Cairo
Pango Fontmap	win32
Media Backend	gstreamer
Input Method	ime
Accessibility backend	test

Application

Name	Value
Application ID	org.gtk.Demo4
Resource Path	/org/gtk/Demo4

Environment

Name	Value
Prefix	C:\msys64\ucrt64
Environment	LC_CTYPE=es_MX.UTF-8 PRINTER=Microsoft Print to PDF XDG_DATA_DIRS=C:\msys64\ucrt64\share;C:\msys64\usr\local\share;C:\msys64\usr\share\

Display

Name	Value
Display	1\WinSta0\Default
RGBA Visual	✓
Composited	✓

Monitors

Name	Value
Monitor 0	(Tipo de monitor estándar) Monitor genérico que no es PnP
Description	(NULL)
Connector	(NULL)
Geometry	1024 × 768 at 0, 0
Pixels	1024 × 768
Size	271 × 203 mm²
Resolution	96,1 dpi
Refresh Rate	64,00 Hz

Seats

Name	Value
Seat 0	Pointer, Keyboard
System Aggregated Keyboard	keyboard
Layouts	Español (México) Español (México)*
System Aggregated Pointer	mouse

OpenGL

Name	Value
GL Renderer	None
	libEGL no disponible

Vulkan

Name	Value
Vulkan Device	None
	Could not create a Vulkan instance: The requested version of Vulkan is not supported by the driver or is otherwise incompatible for implementation-specific reasons. (VK_ERROR_INCOMPATIBLE_DRIVER)

[lazka]

The rendering issues are with opengl and d3d. But good to know that cairo works fine.

[otaxhu]

I remember GTK with GSK_RENDERER set to vulkan or gl never rendering properly on Windows, from way before 4.18, I thought that was a hardware issue with my laptop, that's why I always add something like this to all of the GTK Windows apps I've written.

#if defined(G_OS_WIN32)
if (g_getenv("GSK_RENDERER") == NULL)
{
  g_setenv("GSK_RENDERER", "cairo");
}
#endif

[taozuhong]

The PR should be merged, because the D3DRenderer will not port to the old version.

Or skip this version, move to GTK 4.24 directly.

[taozuhong]

@lazka GTK 4.20.3 is released.

[kleisauke]

It looks like this patch was upstreamed via commit https://gitlab.gnome.org/GNOME/gtk/-/commit/f071763fd69e8924c497b9b21e43ef8e80718eff. MR https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/9185 will likely backport this to 4.20.x.

[otaxhu]

Hi again, this PR should be merged, gvsbuild repository already updated to gtk 4.20.3 and fixed the problems with the shadows (allegedly), maybe we could bring those changes to here.

wingtk/gvsbuild#1675

[lazka]

ok, I'll have a look tomorrow.

[danyeaw]

Actually I referenced the changes that were already here to disable dcomp. I also opened https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/9185 to bring in the cairo fix upstream.

I'm not sure what the video rendering problem is that was referenced.

[lazka]

If we merge this then some video rendering will be broken (see gtk4-widget-factory), though I don't know if there are many users using video rendering in gtk like this. On the other hand we are more closely following upstream. I'm fine with merging, if there are no objections.

[otaxhu]

All seems alright, tested both GL and Cairo and both rendered good, couldn't test Vulkan because didn't have the hardware, but I think it should work as well.

For context, GTK Windows apps with gtk 4.18 (and previous versions) using GL renderer looked like this, I don't exactly have a Windows screenshot, but looked exactly like this. (See this issue)

[otaxhu]

I found that the video player problem dates back to September 2024, see the image attached to the comment.

https://gitlab.gnome.org/GNOME/gtk/-/issues/6721#note_2215021

No issue has been reported upstream in that timespan, so I think it is fine to merge this and hope that this will be resolved in the future.

[taozuhong]

I've built the GTK 4.20.3 package on windows 25H2 with MSYS2, it works fine.