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