This reverts commit fd02afa2e4.
We don't want to remove the GL renderer from our tools yet, because we
use those tools for manual testing and having it available is useful.
In particular, reinstate the GL renderer for rendernode-tool benchmark.
This takes the `position` property and ensures children are sorted by
it, splits children by `pack-type` (also reversing the order of `end`
children), and handles children with `type="center"`.
If either a center child or end children exist, then the `GtkBox` is
converted to a `GtkCenterBox`, with `start-widget`/`end-widget` being a
nested `GtkBox` with the relevant children.
The splitting does cause some non-`object` children to sort differently
(hence the change to `office-runner.expected`.)
Some nodes like `GtkBox` need to process removed-in-GTK4 attributes to
correctly convert their contents. If the node children are processed
first, then those attributes are removed prematurely.
Converting to and from xyz turns out to be more difficult than
expected, depending on what whitepoint you choose, And different
specs choose different whitepoints, so we can't directly map
css xyz to cicp xyz anyway.
Make the whole window area draggable, like usually the titlebar.
This is especially useful with --undecorated.
In that case we need to make the window non-resizable though, becuase
otherwise it can be accidentally maximized and whatnot.
The new renderers don't support them due to the required complexity of
integrating them with Vulkan and the assumptions those nodes make about
the renderer (the GL renderer exports its internal APIs into the
GLShader).
There haven't been any complaints that I'm aware of since 4.14 was
released where the default renderer does not support the nodes, so usage
in public seems to be close to nonexistant.
The 2 uses I know of were workarounds about missing features in GTK that
have stopped since GTK now supports them:
1. GStreamer used in to do premultiplication when the old GL renderer
did not do so in hardware but on the CPU.
2. Adwaita used it for masking before the mask node wa added in 4.10.
Add an 'only_fg' argument to all our internal texture utility
api, so GtkIconTheme can find out if a symbolic png or svg uses
colors beyond the foreground or not.
This information is used in gtk_symbolic_paintable_snapshot_symbolic
to optimize rendering of such symbolic icons.
This command can be used to compare the rendering of a node
to a reference image. It can also be used to compare the
renderings of two nodes, or to compare two images.
We are likely to use the tool with node files from out testsuite,
which may now refer to custom test fonts, so make them available
in the same way as in the node editor.
If in doubt, you can set GTK_SOURCE_DIR to make the tool find the
fonts.
Arcs were appealing, but they have a fatal flaw: we can't
split our arcs without changing the ellipse they trace.
That could be fixed by adding an extra parameter, but then
it is no longer any better than conics.
So switch back to conics, which have the advantage that they
are used elsewhere.
