eaf0079d81
simplify_boundary() was incorrectly comparing squared distances against a non-squared constant. For .25 of a pixel, we need to compare against 0.25 squared, or 0.0625. This also includes a fix to get_edge_normal(), We were actually returning edge "vectors", instead of edge normals. This wasn't causing problems, since the error cancels itself out, but it's confusing. BUG=skia: Change-Id: I0d50f2d001ed5e41de2900139c396b9ef75d2ddf Reviewed-on: https://skia-review.googlesource.com/7043 Commit-Queue: Stephan White <senorblanco@chromium.org> Reviewed-by: Brian Salomon <bsalomon@google.com>
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkCanvas.h"
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#include "SkPath.h"
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namespace {
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// Test thin stroked rect (stroked "by hand", not by stroking).
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void draw_thin_stroked_rect(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(10 + width, 10 + width);
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path.lineTo(40, 10 + width);
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path.lineTo(40, 20);
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path.lineTo(10 + width, 20);
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path.moveTo(10, 10);
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path.lineTo(10, 20 + width);
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path.lineTo(40 + width, 20 + width);
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path.lineTo(40 + width, 10);
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canvas->drawPath(path, paint);
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}
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void draw_thin_right_angle(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(10 + width, 10 + width);
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path.lineTo(40, 10 + width);
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path.lineTo(40, 20);
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path.lineTo(40 + width, 20 + width);
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path.lineTo(40 + width, 10);
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path.lineTo(10, 10);
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canvas->drawPath(path, paint);
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}
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};
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DEF_SIMPLE_GM(thinconcavepaths, canvas, 400, 400) {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kFill_Style);
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canvas->save();
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for (SkScalar width = 1.0; width < 2.05; width += 0.25) {
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draw_thin_stroked_rect(canvas, paint, width);
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canvas->translate(0, 25);
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}
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canvas->restore();
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canvas->translate(50, 0);
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canvas->save();
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for (SkScalar width = 0.5; width < 2.05; width += 0.25) {
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draw_thin_right_angle(canvas, paint, width);
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canvas->translate(0, 25);
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}
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canvas->restore();
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canvas->translate(100, 0);
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}
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