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