retry preparing it for every feature rendered
This can cause a huge slowdown on projects where a layer has a
data defined property with an invalid expression (e.g. due to
a field which has been renamed or dropped).
Sponsored by QGIS grant, identified by Hotspot
from project labeling settings
This is an unnecessary setting, resulting in 1000's of extra, very complex
and untested lines of code. Furthermore, the differences are almost non-existant
and it's extremely unlikely end users would (or should) need to change this
setting.
each new algorithm execution
Avoids the situation where errors reported during an algorithm
which was overall successully executed are append to the errors
for later execution steps
Adds an interface for classes which provider custom
handlers for features rendered as part of a map render job.
QgsRenderedFeatureHandlerInterface objects are registered
in the QgsMapSettings objects used to construct map render
jobs. During the rendering operation, the handleRenderedFeature()
method will be called once for every rendered feature, allowing
the handler to perform some custom task based on the provided
information.
They can be used for custom tasks which operate on a set of
rendered features, such as creating spatial indexes of the
location and rendered symbology bounding box of all features
rendered on a map.
This new setting, "Simplify geometries to reduce output file size",
is exposed in the SVG or PDF export settings dialogs shown when
exporting a layout/atlas/report to PDF or SVG.
If checked (the new default), geometries will be simplified while exporting
layouts in order to remove any redundant vertices which are not
discernably different at the export DPI. (e.g. if export DPI is 300 dpi,
vertices less then 1/600 inch different from each other will be removed).
This avoids exporting ALL geometry vertices during PDF/SVG export,
which can result in a ridiculously complex and large export file size.
Aside from the file size issues, it also causes problems when trying
to load these outputs into other applications, e.g. Inkscape, which
chokes on the huge number of vertices and grinds to a crawl.
Sponsored by the GeoPDF export group
