Add rendergraph capabilities for full support on QML

[acolombier]

Depends on #14887

[JoergAtGithub]

Please fix the Clazy warnings

[acolombier]

If you are referring to the one in src/qml/qmlconfigproxy.cpp, these are false positive due to the macro expansion, which expand emit (a Qt macro) to Q_EMIT, leading to a false detection of a missing emit macros (https://github.com/KDE/clazy/blob/master/docs/checks/README-incorrect-emit.md). This doesn't seem to happen with more recent version of clazy (it took me some time to reproduce locally...) but when downgrading to the one used in CI, I was able to confirm the problem.

Either we keep it like this or I can remove the macro but this will yield a lot of repetitive boilerplate code.

[Copilot]

Pull request overview

This PR expands Mixxx’s QML waveform rendering support by wiring rendergraph-based waveform renderers into the QML scene graph pipeline, adding QML-exposed waveform configuration, and improving rendergraph node invalidation/updates for waveform marks and digits.

Changes:

• Moves/extends waveform renderer capability reporting and option handling so QML can select supported renderer options (and pass options into renderer factories).
• Adds QML WaveformDisplay support for static track/position-driven rendering (in addition to group/player-driven rendering) plus an options property.
• Improves rendergraph update behavior for mark/digits nodes and refactors some waveform renderer initialization behavior.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
src/waveform/widgets/allshader/waveformwidget.h	Forward-decl rendergraph types; inlines supportedOptions() for QML access.
src/waveform/widgets/allshader/waveformwidget.cpp	Moves rendergraph includes to the .cpp; removes now-inlined supportedOptions().
src/waveform/visualplayposition.h	Adds key() accessor for identifying VisualPlayPosition instances.
src/waveform/renderers/waveformwidgetrenderer.h	Adjusts group vs. VisualPlayPosition switching; re-inits on changes.
src/waveform/renderers/waveformwidgetrenderer.cpp	Resets control proxies when no group; adds pre-render early return for missing track/samples source.
src/waveform/renderers/waveformrenderersignalbase.h	Adds virtual setOptions() hook (no-op default).
src/waveform/renderers/waveformrenderersignalbase.cpp	Tweaks EQ-enabled gating logic when EQ enable control is absent.
src/waveform/renderers/waveformrendererabstract.h	Adds cached last play marker position for update optimizations.
src/waveform/renderers/waveformrendererabstract.cpp	Initializes cached last play marker position.
src/waveform/renderers/allshader/waveformrendermark.h	Adds default “next mark position” override support.
src/waveform/renderers/allshader/waveformrendermark.cpp	Uses default next-mark sentinel; optimizes play marker geometry updates; improves until-mark time fallback.
src/waveform/renderers/allshader/digitsrenderer.cpp	Marks geometry/material dirty after digits updates/clears to ensure SG refresh.
src/qml/qmlwaveformrenderer.h	Passes options into factory create(); exposes supported options constants per renderer type.
src/qml/qmlwaveformrenderer.cpp	Implements new create() signatures; adds (currently stubbed) high-detail/textured selection path.
src/qml/qmlwaveformoverview.h	Adjusts signal signatures for Qt < 6.9 vs >= 6.9 compatibility.
src/qml/qmlwaveformdisplay.h	Adds QML properties for static track/position and renderer options; adds enums for waveform type/options.
src/qml/qmlwaveformdisplay.cpp	Implements static track/position handling; passes options to renderers; rebuilds scene graph on option changes.
src/qml/qmltrackproxy.h	Declares metatype for QmlTrackProxy* for QML/Qt meta-object usage.
src/qml/qmlconfigproxy.h	Adds waveform-related QML-facing config properties (type/options/visual gains/etc.).
src/qml/qmlconfigproxy.cpp	Implements waveform config property persistence via macros + custom waveformOptions setter.
res/qml/WaveformDisplay.qml	Updates QML to use new Config properties instead of invokable methods.

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[acolombier]

Addressed Copilot's comment when relevant. What do you think about the clazy situation @JoergAtGithub ?

[JoergAtGithub]

clazy is pass, pre-commit is what is failing here!

[acolombier]

Ah I hadn't noticed - thanks
It should be fixed now.

[JoergAtGithub]

The Clazy warnings are fixed in main now. Please rebase and squash the fixup!

[acolombier]

Done @JoergAtGithub !

[JoergAtGithub]

Thank you!