This uses the new ZoomManager to wire up zoom controls for the
main window. We had to switch away from GMenu to give ourselves
the control we will need for the zoom label of 100% which still
needs to be wired up.
If we don't have a minute worth of input, we should shrink the
visible area to exactly what we came across.
We still have the issue of the UI creating the capture file
before auth has completed, but we can fix that later so we
have a "semantically" correct start time.
These signals are emitted when a visualizer row has been added
or removed from the view. This might be handy if you want to
resize a paned based on the natural size of the visualizers.
This adds a new helper widget SpVisualizerView to simplify using
visualizers from applications using libsysprof-ui-2 such as
Builder.
We can manage the view range, zoom, etc from this widget going
forward.
We need a simple helper to choose colors for visualizers so
they do not overlap. This is just a simple cycle using some
predefined colors.
We should come up with something more unique in the future or
possibly do this with CSS and :nth-child(n) once we have access
to CSS nodes.
We need some sort of scale for content, so we will do this with
an overlay for now. However, we will also want something to be
able to do selections in the future.
This still needs some iteration for correctness, but this sort
of gets the ball rolling.
If we have not yet received our proper draw for the new size
allocation (likely right after the size allocate), then we can
just use the old surface but at a scaled value. This is handy
so that we don't block the main loop trying to do drawing of
lots of data points. Instead we just scale the image and wait
for the high-quality version to complete.
This starts getting the mechanics in place for off screen
rendering using a cairo image surface. We create our own
point cache for storing x,y pairs and then simplify our
drawing based on that.
When creating our private reader copy, we need to reset the
reader so that we start at the beginning. Otherwise, we are
likely to be at the end of the capture (especially for in
memory captures).
This is a simple cache that keeps x,y pairs for use when drawing
visualizers. To keep this generic, and save on memory, we simply
store the x,y coordinates as floats between 0.0 and 1.0. This
saves us roughly 50% on each data point over the 2 8-byte
numbers we would otherwise store.
Obviously, we could take this further and make some fancy index
storage with run-length-encode values, but this should work for
now and allow us to get more exotic later.
This provides the plumbing to do the threaded drawing, we just
need to write the capture cursor and draw operations from the
pixman/cairo worker thread (and do so safely).
This requires that both the left and right condition evaluate
to TRUE. We obviously will want to add more of these for things
like OR, NOT, etc. However, we can add them as necessary since
they are fairly self contained patches.
