147 lines
4.7 KiB
C++
147 lines
4.7 KiB
C++
/*
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* Copyright 2014 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/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkColor.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPathBuilder.h"
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#include "include/core/SkScalar.h"
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#include "include/private/SkFloatBits.h"
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#include "include/private/SkPathRef.h"
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#include "src/core/SkPathPriv.h"
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#define W 800
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#define H 800
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DEF_SIMPLE_GM(analytic_antialias_convex, canvas, W, H) {
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setAntiAlias(true);
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canvas->clear(0xFFFFFFFF);
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canvas->save();
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SkScalar y = 0;
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canvas->translate(0, y);
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canvas->rotate(1);
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canvas->drawRect({ 20, 20, 200, 200 }, p);
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canvas->restore();
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y += 200;
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canvas->save();
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canvas->translate(0, y);
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canvas->rotate(1);
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canvas->drawRect({ 20, 20, 20.2f, 200 }, p);
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canvas->drawRect({ 20, 200, 200, 200.1f }, p);
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canvas->drawCircle(100, 100, 30, p);
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canvas->restore();
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// The following path is empty but it'll reveal bug chrome:662914
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SkPathBuilder path;
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path.moveTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
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// 77.8075f, 231.626f, 77.8074f, 231.625f, 77.8073f, 231.625f
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path.cubicTo(SkBits2Float(0x429b9d71), SkBits2Float(0x4367a022),
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SkBits2Float(0x429b9d64), SkBits2Float(0x4367a009),
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SkBits2Float(0x429b9d50), SkBits2Float(0x43679ff2));
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path.lineTo(SkBits2Float(0x429b9d5c), SkBits2Float(0x4367a041)); // 77.8073f, 231.626f
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path.close();
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canvas->drawPath(path.detach(), p);
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// The following path reveals a subtle SkAnalyticQuadraticEdge::updateQuadratic bug:
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// we should not use any snapped y for the intermediate values whose error may accumulate;
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// snapping should only be allowed once before updateLine.
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path.moveTo(SkBits2Float(0x434ba71e), SkBits2Float(0x438a06d0)); // 203.653f, 276.053f
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path.lineTo(SkBits2Float(0x43492a74), SkBits2Float(0x4396d70d)); // 201.166f, 301.68f
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// 200.921f, 304.207f, 196.939f, 303.82f, 0.707107f
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path.conicTo(SkBits2Float(0x4348ebaf), SkBits2Float(0x43981a75),
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SkBits2Float(0x4344f079), SkBits2Float(0x4397e900), SkBits2Float(0x3f3504f3));
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path.close();
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// Manually setting convexity is required. Otherwise, this path will be considered concave.
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SkPathPriv::SetConvexity(&path, SkPathConvexity::kConvex);
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canvas->drawPath(path.detach(), p);
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// skbug.com/7573
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y += 200;
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canvas->save();
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canvas->translate(0, y);
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p.setAntiAlias(true);
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path.moveTo(1.98009784f, 9.0162744f);
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path.lineTo(47.843992f, 10.1922744f);
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path.lineTo(47.804008f, 11.7597256f);
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path.lineTo(1.93990216f, 10.5837256f);
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canvas->drawPath(path.detach(), p);
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canvas->restore();
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// skbug.com/7813
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// t8888 splits the 800-high canvas into 3 pieces; the boundary is close to 266 and 534
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path.moveTo(700, 266);
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path.lineTo(710, 266);
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path.lineTo(710, 534);
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path.lineTo(700, 534);
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canvas->drawPath(path.detach(), p);
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}
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DEF_SIMPLE_GM(analytic_antialias_general, canvas, W, H) {
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setAntiAlias(true);
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canvas->clear(0xFFFFFFFF);
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canvas->save();
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canvas->rotate(1);
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const SkScalar R = 115.2f, C = 128.0f;
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SkPathBuilder builder;
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builder.moveTo(C + R, C);
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for (int i = 1; i < 8; ++i) {
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SkScalar a = 2.6927937f * i;
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builder.lineTo(C + R * SkScalarCos(a), C + R * SkScalarSin(a));
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}
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SkPath path = builder.detach();
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canvas->drawPath(path, p);
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canvas->restore();
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canvas->save();
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canvas->translate(200, 0);
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canvas->rotate(1);
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p.setStyle(SkPaint::kStroke_Style);
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p.setStrokeWidth(5);
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canvas->drawPath(path, p);
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canvas->restore();
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// The following two paths test if we correctly cumulates the alpha on the middle pixel
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// column where the left rect and the right rect abut.
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p.setStyle(SkPaint::kFill_Style);
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canvas->translate(0, 300);
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canvas->drawPath(SkPathBuilder().addRect({20, 20, 100.4999f, 100})
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.addRect({100.5001f, 20, 200, 100})
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.detach(), p);
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canvas->translate(300, 0);
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canvas->drawPath(SkPathBuilder().addRect({20, 20, 100.1f, 100})
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.addRect({100.9f, 20, 200, 100})
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.detach(), p);
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}
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DEF_SIMPLE_GM(analytic_antialias_inverse, canvas, W, H) {
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SkPaint p;
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p.setColor(SK_ColorRED);
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p.setAntiAlias(true);
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canvas->save();
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SkPath path = SkPath::Circle(100, 100, 30);
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path.setFillType(SkPathFillType::kInverseWinding);
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canvas->drawPath(path, p);
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canvas->restore();
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}
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