move `ConstellationCanvasMsg` to canvas_traits and start canvas paint thread
to components/servo. This, however, does not remove dependency for conditional
compilation options.
Fix canvas wpt test `path-objects/2d.path.rect.zero.4.html`
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After connecting the lines of a rectangle, a new subpath has to be created containing the rectangle's origin as the only point in the subpath.
(see step 4 of https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-rect)
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Add support for WebGL2 uniform matrix operations
Adds support for the `uniformMatrix[234]x[234]fv` WebGL2 functions.
See: https://www.khronos.org/registry/webgl/specs/latest/2.0/#3.7.8
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Note: Similarly to #25538, some of the functions here also overlap with their WebGL 1 variant.
cc @jdm @zakorgy @imiklos
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Fix canvas wpt test ensuring there's a subpath when drawing bezier curves
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These changes will ensure there's a subpath when drawing bezier curves.
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Ensure subpath for control point of CanvasRenderingContext2D.quadraticCurveTo()
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These changes are based on #25444.
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Fix canvas arc path WPT test failures
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Some information of `canvas_data::Pattern` was lost by
converting it to `raqote::Source` due to the fact that Raqote
did not store this information (e.g. linear gradient's start/end
points). We introduce another layer to keep this information for later
use (like in `is_zero_size_gradient()`).
From `addColorStop(offset, color)`s spec:
If multiple stops are added at the same offset on a gradient, they must
be placed in the order added, with the first one closest to the start of
the gradient, and each subsequent one infinitesimally further along
towards the end point (in effect causing all but the first and last stop
added at each point to be ignored)
https://www.w3.org/html/test/results/2dcontext/annotated-spec/canvas.html#testrefs.2d.gradient.interpolate.overlapu
