When shadows were offset - in particular when offset so the original
source was out of bounds of the result - the drawing code would create a
pattern for it that didn't include enough of it to compose a shadow.
Fix that by not creating those patterns anymore, but instead drawing the
source (potentially multiple times) at the required offsets.
While that does more drawing, it simplifies the shadow node draw code,
and that's the primary goal of the Cairo rendering.
Test included.
Make circle contours use 'foreach coordinates' for
its points. This works here, but not for general
conics. As with the other custom contours, avoid
emitting collapsed conics.
The code now follows gsk_rounded_rect_shrink() and with it the behavior
of the Cairo renderer and Webkit.
The old code did what the GL renderer and Cairo do, but I consider that
wrong.
I did not test Chrome.
Test attached
Cairo and the GL renderer have a different idea of how to handle
transitioning of colors outside the defined range.
Consider these stops:
black 50%, white 50%
What color is at 0%?
Cairo would transition between the last and first stop, ie it'd do a
white-to-black transition and end up at rgb(0.5,0.5,0.5) at 0%.
GL would behave as it would for non-repeating gradients and use black
for the range [0%..50%] and white for [50%..100%].
The web would rescale the range so the first stop would be at 0% and
the last stop would be at 100%, so this gradient would be illegal.
Considering that it's possible for code to transition between the
different behaviors by adding explicit stops at 0%/100%, I could choose
any method.
So I chose the simplest one, which is what the GL renderer does and
which treats repeating and non-repeating gradients the same.
Tests attached.
Without an explicit width, height, and viewBox, there is no single
correct way to render an SVG. In the absense of said information,
librsvg is capable of making a guess by rendering the SVG to a Cairo
surface and then analyzing that surface; however, this process is
merely heuristic.
There are three GTK tests for SVG images that are missing dimensions.
While this is not a violation of the SVG specification, it does
implicitly couple the test to the librsvg rendering heuristic. In this
commit we add that dimension information so that the expected result
is unambiguous.
Add a contour that optimizes some things for
rectangles. Also add rectangle detection to the
path parser, and add tests similar to what we
have for the other special contours.
Check that the start- and endpoint work
as expected and verify that their winding
numbers match the ones of the standard contour,
and are negated when the contour is reversed.
This tests the merging of nested color matrix nodes feature of
GtkSnapshot, which was broken before commit 082fdfdb24.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
This takes a render node tree and "replays" it by using the GtkSnapshot
machinery. We don't necesserily expect to get back an exactly equal
render node tree back, since GtkSnapshot applies various small
optimizations where possible, but the original and the replayed nodes
should render to identical textures.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
We don't need to have the derivative as a curve,
it is enough for us to compute values of the
derivative at a given t, which we can also do
for conics.
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.
