65 lines
2.4 KiB
C++
65 lines
2.4 KiB
C++
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/*
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* Copyright 2022 Google LLC
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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/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkPath.h"
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static SkPath get_path() {
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SkPath path;
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path.setFillType(SkPathFillType::kWinding);
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path.moveTo(SkBits2Float(0x45034ec4), SkBits2Float(0x42e7fb80)); // 2100.92f, 115.991f
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path.quadTo(SkBits2Float(0x4500f46c),
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SkBits2Float(0x43333300),
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SkBits2Float(0x4500f46c),
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SkBits2Float(0x431f0ec0)); // 2063.28f, 179.199f, 2063.28f, 159.058f
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path.quadTo(SkBits2Float(0x4500f46c),
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SkBits2Float(0x430ad7c0),
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SkBits2Float(0x45019462),
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SkBits2Float(0x42fed580)); // 2063.28f, 138.843f, 2073.27f, 127.417f
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path.quadTo(SkBits2Float(0x45023458),
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SkBits2Float(0x42e7fb80),
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SkBits2Float(0x45034ec4),
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SkBits2Float(0x42e7fb80)); // 2083.27f, 115.991f, 2100.92f, 115.991f
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path.close();
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return path;
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}
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// Reproduces the underlying problem from skbug.com/12866.
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// The path (part of a glyph) was being drawn stroked, and with a perspective matrix.
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// The perspective matrix forces a very large resScale when stroking the path.
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// The resulting filled path is incorrect. Note that stroking with a smaller resScale works fine.
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DEF_SIMPLE_GM(bug12866, canvas, 128, 64) {
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SkPaint strokePaint;
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strokePaint.setAntiAlias(true);
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strokePaint.setStyle(SkPaint::kStroke_Style);
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strokePaint.setStrokeWidth(3);
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SkPaint fillPaint;
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fillPaint.setAntiAlias(true);
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SkPath strokePath = get_path();
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SkPath fillPath;
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strokePaint.getFillPath(strokePath, &fillPath, nullptr, 1200.0f);
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SkRect strokeBounds = strokePath.getBounds();
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SkRect fillBounds = fillPath.getBounds();
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// Draw the stroked path. This (internally) uses a resScale of 1.0, and looks good.
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canvas->save();
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canvas->translate(10 - strokeBounds.fLeft, 10 - strokeBounds.fTop);
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canvas->drawPath(strokePath, strokePaint);
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canvas->restore();
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// With a perspective CTM, it's possible for resScale to become large. Draw the filled
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// path produced by the stroker in that situation, which ends up being incorrect.
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canvas->save();
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canvas->translate(74 - fillBounds.fLeft, 10 - fillBounds.fTop);
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canvas->drawPath(fillPath, fillPaint);
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canvas->restore();
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}
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