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skia2/gm/circulararcs.cpp
Herb Derby c37b386886 Replace SK_ARRAY_COUNT with std::size() for skia/gm 
Note: in variedtext.cpp:66 changed static_assert to SkASSERT.

Change-Id: I853a2e5563c90c9dde5d6ba5443cc73b664b493d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/551876
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
2022-06-21 18:09:30 +00:00

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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/SkPathBuilder.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>
#include "include/effects/SkStrokeAndFillPathEffect.h"
static void set_strokeandfill(SkPaint* paint) {
SkASSERT(paint->getPathEffect() == nullptr);
paint->setPathEffect(SkStrokeAndFillPathEffect::Make());
paint->setStroke(true);
}
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->setStroke(false); };
draw_arcs(canvas, setFill);
}
DEF_ARC_GM(hairline) {
auto setHairline = [] (SkPaint* p) {
p->setStroke(true);
p->setStrokeWidth(0.f);
};
draw_arcs(canvas, setHairline);
}
DEF_ARC_GM(stroke_butt) {
auto setStroke = [](SkPaint* p) {
p->setStroke(true);
p->setStrokeCap(SkPaint::kButt_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_square) {
auto setStroke = [] (SkPaint* p) {
p->setStroke(true);
p->setStrokeCap(SkPaint::kSquare_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_round) {
auto setStroke = [] (SkPaint* p) {
p->setStroke(true);
p->setStrokeCap(SkPaint::kRound_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_and_fill_butt) {
auto setStroke = [] (SkPaint* p) {
set_strokeandfill(p);
p->setStrokeCap(SkPaint::kButt_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_and_fill_square) {
auto setStroke = [] (SkPaint* p) {
set_strokeandfill(p);
p->setStrokeCap(SkPaint::kSquare_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_and_fill_round) {
auto setStroke = [] (SkPaint* p) {
set_strokeandfill(p);
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().setStroke(true);
paints.back().setStrokeWidth(kS / 6.f);
// hairline
paints.push_back().setStroke(true);
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().setStroke(true);
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 = std::size(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) {
SkPathBuilder 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.setStroke(true);
p0.setAlpha(100);
canvas->translate(20, 0);
canvas->drawPath(path.detach(), p0);
canvas->drawArc(SkRect{60, 0, 100, 40}, 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.setStroke(true);
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.setStroke(true);
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;
}
}
}
}
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