This is a new opt-in flag for map settings/render context/layouts.
If set, then when applying clipping paths for selective masking,
we always use global ("entire map") paths, instead of calculating
local clipping paths per rendered feature. This results in
considerably more complex vector exports in all current Qt versions,
but gives us a way to force this IF/when a future Qt version adds
optimisations which make global masks desirable.
These are the symbol layer classes where there's no special logic
required relating to feature rendering and features are rendered
one-by-one, with no sub symbols.
Optimise the logic used when the new geometry backend for
selective masking is in effect:
Whenever its SAFE, instead of calculating an "entire map" clipping
path and then applying this for every feature being rendered,
we now defer the calculation of the clipping path until we
are rendering individual features. Then, we create a clipping path
which contains ONLY the mask paths which are within the area
being drawn over.
This avoids having the entire map clipping path being used for
EVERY feature being rendered, which results in huge PDF/SVG
exports when masks are in effect, and instead results in
clipping paths which are confined just to a sensible area
around each rendered feature.
In some complex test projects this reduces the PDF export
size by a factor of 0.01!! (and results in PDFs/SVGs which
open much quicker in viewers and editors, and don't grind
their operation to a halt).
And API mechanism to propagate these from layout exports down
to the render context
Gives us a place to specify fine-tuned control over masking
settings for map renders
Add QgsAbstractGeometry::simplifyByDistance, which is a direct
port of GEOS Douglas Peucker algorithm.
This is a trivial algorithm to implement, and we benefit from
avoiding the conversion to/from GEOS geometries.
Avoid calling expensive sipConvertFromNewType method when feature
attribute is a trivial type
Also avoid a copy of the feature attributes which we don't require
Filters must be configurable for each individual expansion level,
as we can't achieve the same results by a single top-level filter.
For instance, this prevents filtering children from the expansion
to return just the most recent observation.
If the 'map/maskBackend' QSettings key is set to 'geometry', then
QgsGeometryPaintEngine will be used for calculating clip paths
for label masking instead of QPainterPath
The intention here is that we gain improved flexibility to optimise
the creation and logic behind clipping path generation, vs the
limited API we get from QPainterPath.
Deprecating QgsGeometry::addPart in favor of QgsGeometry::addPartV2
to use Qgis::WkbType instead of Qgis::GeometryType because the latter
can't handle curved geometries (not specific enough).
Fixes#57255
