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skia2/gm/patheffects.cpp
John Stiles a6841be235 Enable ClangTidy check llvm-namespace-comment. 
This fixes a large number of SkSL namespaces which were labeled as if
they were anonymous, and also a handful of other mislabeled namespaces.
Missing namespace-end comments have been added throughout.
A number of diffs are just indentation-related (adjusting 1- or 3-
space indents to 2-space).

Change-Id: I6c62052a0d3aea4ae12ca07e0c2a8587b2fce4ec
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/308503
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2020-08-06 19:07:52 +00:00

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/*
* Copyright 2012 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/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPath.h"
#include "include/core/SkPathEffect.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypes.h"
#include "include/effects/Sk1DPathEffect.h"
#include "include/effects/Sk2DPathEffect.h"
#include "include/effects/SkCornerPathEffect.h"
#include "include/effects/SkDashPathEffect.h"
#include "include/effects/SkDiscretePathEffect.h"
#include "include/effects/SkOpPathEffect.h"
#include "include/pathops/SkPathOps.h"
#include <initializer_list>
namespace skiagm {
static void compose_pe(SkPaint* paint) {
SkPathEffect* pe = paint->getPathEffect();
sk_sp<SkPathEffect> corner = SkCornerPathEffect::Make(25);
sk_sp<SkPathEffect> compose;
if (pe) {
compose = SkPathEffect::MakeCompose(sk_ref_sp(pe), corner);
} else {
compose = corner;
}
paint->setPathEffect(compose);
}
static void hair_pe(SkPaint* paint) {
paint->setStrokeWidth(0);
}
static void hair2_pe(SkPaint* paint) {
paint->setStrokeWidth(0);
compose_pe(paint);
}
static void stroke_pe(SkPaint* paint) {
paint->setStrokeWidth(12);
compose_pe(paint);
}
static void dash_pe(SkPaint* paint) {
SkScalar inter[] = { 20, 10, 10, 10 };
paint->setStrokeWidth(12);
paint->setPathEffect(SkDashPathEffect::Make(inter, SK_ARRAY_COUNT(inter), 0));
compose_pe(paint);
}
constexpr int gXY[] = {
4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
};
static void scale(SkPath* path, SkScalar scale) {
SkMatrix m;
m.setScale(scale, scale);
path->transform(m);
}
static void one_d_pe(SkPaint* paint) {
SkPath path;
path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
path.close();
path.offset(SkIntToScalar(-6), 0);
scale(&path, 1.5f);
paint->setPathEffect(SkPath1DPathEffect::Make(path, SkIntToScalar(21), 0,
SkPath1DPathEffect::kRotate_Style));
compose_pe(paint);
}
typedef void (*PE_Proc)(SkPaint*);
constexpr PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
static void fill_pe(SkPaint* paint) {
paint->setStyle(SkPaint::kFill_Style);
paint->setPathEffect(nullptr);
}
static void discrete_pe(SkPaint* paint) {
paint->setPathEffect(SkDiscretePathEffect::Make(10, 4));
}
static sk_sp<SkPathEffect> MakeTileEffect() {
SkMatrix m;
m.setScale(SkIntToScalar(12), SkIntToScalar(12));
SkPath path;
path.addCircle(0, 0, SkIntToScalar(5));
return SkPath2DPathEffect::Make(m, path);
}
static void tile_pe(SkPaint* paint) {
paint->setPathEffect(MakeTileEffect());
}
constexpr PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
class PathEffectGM : public GM {
public:
PathEffectGM() {}
protected:
SkString onShortName() override {
return SkString("patheffect");
}
SkISize onISize() override { return SkISize::Make(800, 600); }
void onDraw(SkCanvas* canvas) override {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
SkPath path;
path.moveTo(20, 20);
path.lineTo(70, 120);
path.lineTo(120, 30);
path.lineTo(170, 80);
path.lineTo(240, 50);
canvas->save();
for (size_t i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
gPE[i](&paint);
canvas->drawPath(path, paint);
canvas->translate(0, 75);
}
canvas->restore();
path.reset();
SkRect r = { 0, 0, 250, 120 };
path.addOval(r, SkPathDirection::kCW);
r.inset(50, 50);
path.addRect(r, SkPathDirection::kCCW);
canvas->translate(320, 20);
for (size_t i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
gPE2[i](&paint);
canvas->drawPath(path, paint);
canvas->translate(0, 160);
}
const SkIRect rect = SkIRect::MakeXYWH(20, 20, 60, 60);
for (size_t i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
SkPaint p;
p.setAntiAlias(true);
p.setStyle(SkPaint::kFill_Style);
gPE[i](&p);
canvas->drawIRect(rect, p);
canvas->translate(75, 0);
}
}
private:
typedef GM INHERITED;
};
DEF_GM( return new PathEffectGM; )
} // namespace skiagm
//////////////////////////////////////////////////////////////////////////////
class ComboPathEfectsGM : public skiagm::GM {
public:
ComboPathEfectsGM() {}
protected:
SkString onShortName() override {
return SkString("combo-patheffects");
}
SkISize onISize() override { return SkISize::Make(360, 630); }
void onDraw(SkCanvas* canvas) override {
SkPath path0, path1, path2;
path0.addCircle(100, 100, 60);
path1.moveTo(20, 20); path1.cubicTo(20, 180, 140, 0, 140, 140);
sk_sp<SkPathEffect> effects[] = {
nullptr,
SkStrokePathEffect::Make(20, SkPaint::kRound_Join, SkPaint::kRound_Cap, 0),
SkMergePathEffect::Make(nullptr,
SkStrokePathEffect::Make(20, SkPaint::kRound_Join,
SkPaint::kRound_Cap, 0),
kDifference_SkPathOp),
SkMergePathEffect::Make(SkMatrixPathEffect::MakeTranslate(50, 30),
SkStrokePathEffect::Make(20, SkPaint::kRound_Join,
SkPaint::kRound_Cap, 0),
kReverseDifference_SkPathOp),
};
SkPaint wireframe;
wireframe.setStyle(SkPaint::kStroke_Style);
wireframe.setAntiAlias(true);
SkPaint paint;
paint.setColor(0xFF8888FF);
paint.setAntiAlias(true);
for (const SkPath& path : { path0, path1 }) {
canvas->save();
for (const sk_sp<SkPathEffect>& pe : effects) {
paint.setPathEffect(pe);
canvas->drawPath(path, paint);
canvas->drawPath(path, wireframe);
canvas->translate(0, 150);
}
canvas->restore();
canvas->translate(180, 0);
}
}
private:
typedef GM INHERITED;
};
DEF_GM(return new ComboPathEfectsGM;)
#include "include/effects/SkStrokeAndFillPathEffect.h"
// Test that we can replicate SkPaint::kStrokeAndFill_Style
// with a patheffect. We expect the 2nd and 3rd columns to draw the same.
DEF_SIMPLE_GM(stroke_and_fill_patheffect, canvas, 900, 450) {
const float kStrokeWidth = 20;
typedef SkPath (*Maker)();
const Maker makers[] = {
[]() { return SkPath::Oval({0, 0, 100, 100}, SkPathDirection::kCW); },
[]() { return SkPath::Oval({0, 0, 100, 100}, SkPathDirection::kCCW); },
[]() {
const SkPoint pts[] = {
{0, 0}, {100, 100}, {0, 100}, {100, 0},
};
return SkPath::Polygon(pts, SK_ARRAY_COUNT(pts), true);
},
};
const struct {
SkPaint::Style fStyle;
float fWidth;
bool fUsePE;
bool fExpectStrokeAndFill;
} rec[] = {
{ SkPaint::kStroke_Style, 0, false, false },
{ SkPaint::kFill_Style, 0, true, false },
{ SkPaint::kStroke_Style, 0, true, false },
{ SkPaint::kStrokeAndFill_Style, kStrokeWidth, false, true },
{ SkPaint::kStroke_Style, kStrokeWidth, true, true },
{ SkPaint::kStrokeAndFill_Style, kStrokeWidth, true, true },
};
SkPaint paint;
canvas->translate(20, 20);
for (auto maker : makers) {
const SkPath path = maker();
canvas->save();
for (const auto& r : rec) {
paint.setStyle(r.fStyle);
paint.setStrokeWidth(r.fWidth);
paint.setPathEffect(r.fUsePE ? SkStrokeAndFillPathEffect::Make() : nullptr);
paint.setColor(r.fExpectStrokeAndFill ? SK_ColorGRAY : SK_ColorBLACK);
canvas->drawPath(path, paint);
canvas->translate(150, 0);
}
canvas->restore();
canvas->translate(0, 150);
}
}
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