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- /*
- * 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;
- }
- }
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