/* * Copyright 2016 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/SkPathEffect.h" #include "include/core/SkRect.h" #include "include/core/SkScalar.h" #include "include/core/SkTypes.h" #include "include/effects/SkDashPathEffect.h" #include "include/private/SkFloatBits.h" #include "include/private/SkTArray.h" #include <functional> constexpr SkScalar kStarts[] = {0.f, 10.f, 30.f, 45.f, 90.f, 165.f, 180.f, 270.f}; constexpr SkScalar kSweeps[] = {1.f, 45.f, 90.f, 130.f, 180.f, 184.f, 300.f, 355.f}; constexpr SkScalar kDiameter = 40.f; constexpr SkRect kRect = {0.f, 0.f, kDiameter, kDiameter}; constexpr int kW = 1000; constexpr int kH = 1000; constexpr SkScalar kPad = 20.f; void draw_arcs(SkCanvas* canvas, std::function<void(SkPaint*)> configureStyle) { // Draws grid of arcs with different start/sweep angles in red and their complement arcs in // blue. auto drawGrid = [canvas, &configureStyle] (SkScalar x, SkScalar y, bool useCenter, bool aa) { SkPaint p0; p0.setColor(SK_ColorRED); p0.setAntiAlias(aa); // Set a reasonable stroke width that configureStyle can override. p0.setStrokeWidth(15.f); SkPaint p1 = p0; p1.setColor(SK_ColorBLUE); // Use alpha so we see magenta on overlap between arc and its complement. p0.setAlpha(100); p1.setAlpha(100); configureStyle(&p0); configureStyle(&p1); canvas->save(); canvas->translate(kPad + x, kPad + y); for (auto start : kStarts) { canvas->save(); for (auto sweep : kSweeps) { canvas->drawArc(kRect, start, sweep, useCenter, p0); canvas->drawArc(kRect, start, -(360.f - sweep), useCenter, p1); canvas->translate(kRect.width() + kPad, 0.f); } canvas->restore(); canvas->translate(0, kRect.height() + kPad); } canvas->restore(); }; // Draw a grids for combo of enabling/disabling aa and using center. constexpr SkScalar kGridW = kW / 2.f; constexpr SkScalar kGridH = kH / 2.f; drawGrid(0.f , 0.f , false, false); drawGrid(kGridW, 0.f , true , false); drawGrid(0.f , kGridH, false, true ); drawGrid(kGridW, kGridH, true , true ); // Draw separators between the grids. SkPaint linePaint; linePaint.setAntiAlias(true); linePaint.setColor(SK_ColorBLACK); canvas->drawLine(kGridW, 0.f , kGridW, SkIntToScalar(kH), linePaint); canvas->drawLine(0.f , kGridH, SkIntToScalar(kW), kGridH, linePaint); } #define DEF_ARC_GM(name) DEF_SIMPLE_GM(circular_arcs_##name, canvas, kW, kH) DEF_ARC_GM(fill) { auto setFill = [] (SkPaint*p) { p->setStyle(SkPaint::kFill_Style); }; draw_arcs(canvas, setFill); } DEF_ARC_GM(hairline) { auto setHairline = [] (SkPaint* p) { p->setStyle(SkPaint::kStroke_Style); p->setStrokeWidth(0.f); }; draw_arcs(canvas, setHairline); } DEF_ARC_GM(stroke_butt) { auto setStroke = [](SkPaint* p) { p->setStyle(SkPaint::kStroke_Style); p->setStrokeCap(SkPaint::kButt_Cap); }; draw_arcs(canvas, setStroke); } DEF_ARC_GM(stroke_square) { auto setStroke = [] (SkPaint* p) { p->setStyle(SkPaint::kStroke_Style); p->setStrokeCap(SkPaint::kSquare_Cap); }; draw_arcs(canvas, setStroke); } DEF_ARC_GM(stroke_round) { auto setStroke = [] (SkPaint* p) { p->setStyle(SkPaint::kStroke_Style); p->setStrokeCap(SkPaint::kRound_Cap); }; draw_arcs(canvas, setStroke); } DEF_ARC_GM(stroke_and_fill_butt) { auto setStroke = [] (SkPaint* p) { p->setStyle(SkPaint::kStrokeAndFill_Style); p->setStrokeCap(SkPaint::kButt_Cap); }; draw_arcs(canvas, setStroke); } DEF_ARC_GM(stroke_and_fill_square) { auto setStroke = [] (SkPaint* p) { p->setStyle(SkPaint::kStrokeAndFill_Style); p->setStrokeCap(SkPaint::kSquare_Cap); }; draw_arcs(canvas, setStroke); } DEF_ARC_GM(stroke_and_fill_round) { auto setStroke = [] (SkPaint* p) { p->setStyle(SkPaint::kStrokeAndFill_Style); p->setStrokeCap(SkPaint::kRound_Cap); }; draw_arcs(canvas, setStroke); } DEF_SIMPLE_GM(circular_arcs_weird, canvas, 1000, 400) { constexpr SkScalar kS = 50; struct Arc { SkRect fOval; SkScalar fStart; SkScalar fSweep; }; const Arc noDrawArcs[] = { // no sweep {SkRect::MakeWH(kS, kS), 0, 0}, // empty rect in x {SkRect::MakeWH(-kS, kS), 0, 90}, // empty rect in y {SkRect::MakeWH(kS, -kS), 0, 90}, // empty rect in x and y {SkRect::MakeWH( 0, 0), 0, 90}, }; const Arc arcs[] = { // large start {SkRect::MakeWH(kS, kS), 810.f, 90.f}, // large negative start {SkRect::MakeWH(kS, kS), -810.f, 90.f}, // exactly 360 sweep {SkRect::MakeWH(kS, kS), 0.f, 360.f}, // exactly -360 sweep {SkRect::MakeWH(kS, kS), 0.f, -360.f}, // exactly 540 sweep {SkRect::MakeWH(kS, kS), 0.f, 540.f}, // exactly -540 sweep {SkRect::MakeWH(kS, kS), 0.f, -540.f}, // generic large sweep and large start {SkRect::MakeWH(kS, kS), 1125.f, 990.f}, }; SkTArray<SkPaint> paints; // fill paints.push_back(); // stroke paints.push_back().setStyle(SkPaint::kStroke_Style); paints.back().setStrokeWidth(kS / 6.f); // hairline paints.push_back().setStyle(SkPaint::kStroke_Style); paints.back().setStrokeWidth(0.f); // stroke and fill paints.push_back().setStyle(SkPaint::kStrokeAndFill_Style); paints.back().setStrokeWidth(kS / 6.f); // dash effect paints.push_back().setStyle(SkPaint::kStroke_Style); paints.back().setStrokeWidth(kS / 6.f); constexpr SkScalar kDashIntervals[] = {kS / 15, 2 * kS / 15}; paints.back().setPathEffect(SkDashPathEffect::Make(kDashIntervals, 2, 0.f)); canvas->translate(kPad, kPad); // This loop should draw nothing. for (auto arc : noDrawArcs) { for (auto paint : paints) { paint.setAntiAlias(true); canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, false, paint); canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, true, paint); } } SkPaint linePaint; linePaint.setAntiAlias(true); linePaint.setColor(SK_ColorRED); SkScalar midX = SK_ARRAY_COUNT(arcs) * (kS + kPad) - kPad/2.f; SkScalar height = paints.count() * (kS + kPad); canvas->drawLine(midX, -kPad, midX, height, linePaint); for (auto paint : paints) { paint.setAntiAlias(true); canvas->save(); for (auto arc : arcs) { canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, false, paint); canvas->translate(kS + kPad, 0.f); } for (auto arc : arcs) { canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, true, paint); canvas->translate(kS + kPad, 0.f); } canvas->restore(); canvas->translate(0, kS + kPad); } } DEF_SIMPLE_GM(onebadarc, canvas, 100, 100) { SkPath path; path.moveTo(SkBits2Float(0x41a00000), SkBits2Float(0x41a00000)); // 20, 20 path.lineTo(SkBits2Float(0x4208918c), SkBits2Float(0x4208918c)); // 34.1421f, 34.1421f path.conicTo(SkBits2Float(0x41a00000), SkBits2Float(0x42412318), // 20, 48.2843f SkBits2Float(0x40bb73a0), SkBits2Float(0x4208918c), // 5.85786f, 34.1421f SkBits2Float(0x3f3504f3)); // 0.707107f path.quadTo(SkBits2Float(0x40bb73a0), SkBits2Float(0x4208918c), // 5.85786f, 34.1421f SkBits2Float(0x40bb73a2), SkBits2Float(0x4208918c)); // 5.85787f, 34.1421f path.lineTo(SkBits2Float(0x41a00000), SkBits2Float(0x41a00000)); // 20, 20 path.close(); SkPaint p0; p0.setColor(SK_ColorRED); p0.setStrokeWidth(15.f); p0.setStyle(SkPaint::kStroke_Style); p0.setAlpha(100); canvas->translate(20, 0); canvas->drawPath(path, p0); SkRect kRect = { 60, 0, 100, 40}; canvas->drawArc(kRect, 45, 90, true, p0); } DEF_SIMPLE_GM(crbug_888453, canvas, 480, 150) { // Two GPU path renderers were using a too-large tolerance when chopping connics to quads. // This manifested as not-very-round circular arcs at certain radii. All the arcs being drawn // here should look like circles. SkPaint fill; fill.setAntiAlias(true); SkPaint hairline = fill; hairline.setStyle(SkPaint::kStroke_Style); SkPaint stroke = hairline; stroke.setStrokeWidth(2.0f); int x = 4; int y0 = 25, y1 = 75, y2 = 125; for (int r = 2; r <= 20; ++r) { canvas->drawArc(SkRect::MakeXYWH(x - r, y0 - r, 2 * r, 2 * r), 0, 360, false, fill); canvas->drawArc(SkRect::MakeXYWH(x - r, y1 - r, 2 * r, 2 * r), 0, 360, false, hairline); canvas->drawArc(SkRect::MakeXYWH(x - r, y2 - r, 2 * r, 2 * r), 0, 360, false, stroke); x += 2 * r + 4; } } DEF_SIMPLE_GM(circular_arc_stroke_matrix, canvas, 820, 1090) { static constexpr SkScalar kRadius = 40.f; static constexpr SkScalar kStrokeWidth = 5.f; static constexpr SkScalar kStart = 89.f; static constexpr SkScalar kSweep = 180.f/SK_ScalarPI; // one radian SkTArray<SkMatrix> matrices; matrices.push_back().setRotate(kRadius, kRadius, 45.f); matrices.push_back(SkMatrix::I()); matrices.push_back().setAll(-1, 0, 2*kRadius, 0, 1, 0, 0, 0, 1); matrices.push_back().setAll( 1, 0, 0, 0, -1, 2*kRadius, 0, 0, 1); matrices.push_back().setAll( 1, 0, 0, 0, -1, 2*kRadius, 0, 0, 1); matrices.push_back().setAll( 0, -1, 2*kRadius, -1, 0, 2*kRadius, 0, 0, 1); matrices.push_back().setAll( 0, -1, 2*kRadius, 1, 0, 0, 0, 0, 1); matrices.push_back().setAll( 0, 1, 0, 1, 0, 0, 0, 0, 1); matrices.push_back().setAll( 0, 1, 0, -1, 0, 2*kRadius, 0, 0, 1); int baseMatrixCnt = matrices.count(); SkMatrix tinyCW; tinyCW.setRotate(0.001f, kRadius, kRadius); for (int i = 0; i < baseMatrixCnt; ++i) { matrices.push_back().setConcat(matrices[i], tinyCW); } SkMatrix tinyCCW; tinyCCW.setRotate(-0.001f, kRadius, kRadius); for (int i = 0; i < baseMatrixCnt; ++i) { matrices.push_back().setConcat(matrices[i], tinyCCW); } SkMatrix cw45; cw45.setRotate(45.f, kRadius, kRadius); for (int i = 0; i < baseMatrixCnt; ++i) { matrices.push_back().setConcat(matrices[i], cw45); } int x = 0; int y = 0; static constexpr SkScalar kPad = 2*kStrokeWidth; canvas->translate(kPad, kPad); auto bounds = SkRect::MakeWH(2*kRadius, 2*kRadius); for (auto cap : {SkPaint::kRound_Cap, SkPaint::kButt_Cap, SkPaint::kSquare_Cap}) { for (const auto& m : matrices) { SkPaint paint; paint.setStrokeCap(cap); paint.setAntiAlias(true); paint.setStyle(SkPaint::kStroke_Style); paint.setStrokeWidth(kStrokeWidth); canvas->save(); canvas->translate(x * (2*kRadius + kPad), y * (2*kRadius + kPad)); canvas->concat(m); paint.setColor(SK_ColorRED); paint.setAlpha(0x80); canvas->drawArc(bounds, kStart, kSweep, false, paint); paint.setColor(SK_ColorBLUE); paint.setAlpha(0x80); canvas->drawArc(bounds, kStart, kSweep - 360.f, false, paint); canvas->restore(); ++x; if (x == baseMatrixCnt) { x = 0; ++y; } } } }