Most of the time the snapshot is less than 16 levels deep (did some testing
in gtk-demo), so lets pre-allocate 16 levels of state stack to avoid the
extra allocation most of the time.
... or gradients or borders or shadows. Instead, ensure that affines
have non-negative scale factors. Otherwise add a transform node.
The only place where this check is not necessary is color nodes, but
special casing them seems not worth it.
These will replace the previous gtk_snapshot_new_with_parent(), which
allocated an entirely new GObject just to push()/pop() some state. This
is already a problem but will be more important in the future as we
start using this more.
Previously, we wrapped all GtkCssShadowValues in a GtkCssShadowsValue,
even if it was just one shadow. This causes an unnecessary bloat in
css values.
Make each GtkCssShadowValue able to handle multiple shadows instead, and
use gtk_css_shadow_value* API everywhere.
The differenciation between a literal color value and an RGBA value
caused problems in various situations. Just treat the two the same but
don't allow access to the rgba value of a non-literal color value.
This gets rid of around 1.6k rgba values in the widget-factory.
A color matrix node that contains a transform node can also be expressed
the other way around, as a transform node containing a color matrix
node.
In the general case, the color matrix node will have to draw its
child to a texture so it can color every pixel of that texture, but the
renderers can short-cut this if the child of the color matrix node is
already a texture node. So if we have a node tree like
Color Matrix
- Transform
- Texture
The renderer would have to either check the grandchild of the color
matrix or simply fall back to rendering the transform node to a texture.
In the new configuration:
Transform
- Color Matrix
- Texture
The renderer can easily see that the child node of the color matrix node
is a texture, and skip rendering it to a texture.
This is for example happening in current Adwaita for spinners, which are
rotated symbolics.
Make the API expect a tranform of the proper category instead of
doing the check ourselves and returning TRUE/FALSE.
The benefit is that the mai use case is switch (transform->category)
statements and in those we know the category and don't need to check
TRUE/FALSE.
Using the wrong matrix will now cause a g_warning().
Instead of gtk_snapshot_offset(), provide a full set of functions
kept in sync with GtkTransform APIs.
On top of that, add gtk_snapshot_save() and gtk_snapshot_restore()
mirroring cairo_save()/restore() that allow saving a snapshot's
transform state.
The code didn't change, it was just shuffled around to make the
with_bounds() versions of the text rendering unnecessary and instead
pass through the generic append_node() path.
Instead of just tracking 2 integer translate_x/y coordinates, tracka a
full GtkTransform.
When creating actual nodes, if the transform is simple enough, just
create the node in a way that makes use of the transform. If the
node, can't represent the transform, just push a transform node instead
and automatically pop that node with the next gtk_snapshot_pop() call.
They were a neat idea while they lasted. But now, it's time for
categorized transform nodes, where matrices with
GSK_MATRIX_CATEGORY_2D_TRANSLATE are the exact replacement.
Renderers have not been adapted for this purpose, so they (continue to)
run slow paths.
