e260c46bbf
This CL implements two major changes to the AA tessellating path renderer: 1) Fix inverted edges after stroke and simplify. Instead of detecting and fixing edges which invert on stroking during the stroking pass, we run the full simplify pass on both inner and outer contours, then create edge collapse events for the overlap regions. We then process the edge events in a priority queue and process them in order of decreasing alpha (this is the "edge event" part of the straight skeleton algorithm). By doing it after simplification, we ensure that there's a full-alpha intersection vertex to join the collapse edge to (which may have <1 alpha), so no spurious gradients appear in the rendered path. 2) "Pointy" vertices (defined as those which meet at an acute angle less than 14 degrees) are now properly bevelled off during stroking. This removes antialiasing artifacts which extend beyond the path boundary. Some ancillary changes: The extracted boundaries which are input to stroking have their line equations pre-normalized, and multiplied by winding. This simplifies a lot of code which was performing this computation on the fly. The workaround for the "intruding vertex" problem was removed, since the straight skeleton now moves the intruding vertex before it can cause problems. Bug: 756823 Change-Id: I271ed32be6847da55273b387e8c04bbf9b512b70 Reviewed-on: https://skia-review.googlesource.com/87341 Reviewed-by: Brian Salomon <bsalomon@google.com> Commit-Queue: Stephen White <senorblanco@chromium.org> |
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Skia is a complete 2D graphic library for drawing Text, Geometries, and Images. See full details, and build instructions, at https://skia.org.