skia2/gm/crbug_847759.cpp
Brian Salomon 3ac1f95987 Preseve tangents when converting cubics->quads in GrAAHairlinePathRenderer
Bug: chromium:847759
Change-Id: I35a6d069f732d906714a640fca59a71fd35b74ec
Reviewed-on: https://skia-review.googlesource.com/152664
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
2018-09-07 20:21:24 +00:00

33 lines
1.1 KiB
C++

/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkPath.h"
DEF_SIMPLE_GM(crbug_847759, canvas, 500, 500) {
// This path exposed an issue in GrAAHairlinePathRenderer. When converting from cubics to quads
// we produced quads where the previously vertical tangents at the left and right tips of the
// squashed oval-like path became slightly non-vertical. This caused a missed pixel of AA just
// outside each tip.
SkPath path;
path.moveTo(97,374.5f);
path.cubicTo(97,359.8644528f,155.8745488f,348,228.5f,348);
path.cubicTo(301.1254512f,348,360,359.8644528f,360,374.5f);
path.cubicTo(360,389.1355472f,301.1254512f,401,228.5f,401);
path.cubicTo(155.8745488f,401,97,389.1355472f,97,374.5f);
path.close();
SkPaint paint;
paint.setAntiAlias(true);
paint.setStrokeWidth(0);
paint.setStrokeMiter(1.5);
paint.setStyle(SkPaint::kStroke_Style);
canvas->translate(-80, -330);
canvas->drawPath(path, paint);
}