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