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      1 /*
      2  * Copyright 2012 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 #include "gm.h"
      8 #include "SkCanvas.h"
      9 #include "SkPaint.h"
     10 #include "Sk1DPathEffect.h"
     11 #include "Sk2DPathEffect.h"
     12 #include "SkCornerPathEffect.h"
     13 #include "SkDashPathEffect.h"
     14 #include "SkDiscretePathEffect.h"
     15 
     16 namespace skiagm {
     17 
     18 static void compose_pe(SkPaint* paint) {
     19     SkPathEffect* pe = paint->getPathEffect();
     20     sk_sp<SkPathEffect> corner = SkCornerPathEffect::Make(25);
     21     sk_sp<SkPathEffect> compose;
     22     if (pe) {
     23         compose = SkPathEffect::MakeCompose(sk_ref_sp(pe), corner);
     24     } else {
     25         compose = corner;
     26     }
     27     paint->setPathEffect(compose);
     28 }
     29 
     30 static void hair_pe(SkPaint* paint) {
     31     paint->setStrokeWidth(0);
     32 }
     33 
     34 static void hair2_pe(SkPaint* paint) {
     35     paint->setStrokeWidth(0);
     36     compose_pe(paint);
     37 }
     38 
     39 static void stroke_pe(SkPaint* paint) {
     40     paint->setStrokeWidth(12);
     41     compose_pe(paint);
     42 }
     43 
     44 static void dash_pe(SkPaint* paint) {
     45     SkScalar inter[] = { 20, 10, 10, 10 };
     46     paint->setStrokeWidth(12);
     47     paint->setPathEffect(SkDashPathEffect::Make(inter, SK_ARRAY_COUNT(inter), 0));
     48     compose_pe(paint);
     49 }
     50 
     51 constexpr int gXY[] = {
     52 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
     53 };
     54 
     55 static void scale(SkPath* path, SkScalar scale) {
     56     SkMatrix m;
     57     m.setScale(scale, scale);
     58     path->transform(m);
     59 }
     60 
     61 static void one_d_pe(SkPaint* paint) {
     62     SkPath  path;
     63     path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
     64     for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
     65         path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
     66     path.close();
     67     path.offset(SkIntToScalar(-6), 0);
     68     scale(&path, 1.5f);
     69 
     70     paint->setPathEffect(SkPath1DPathEffect::Make(path, SkIntToScalar(21), 0,
     71                                                   SkPath1DPathEffect::kRotate_Style));
     72     compose_pe(paint);
     73 }
     74 
     75 typedef void (*PE_Proc)(SkPaint*);
     76 constexpr PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
     77 
     78 static void fill_pe(SkPaint* paint) {
     79     paint->setStyle(SkPaint::kFill_Style);
     80     paint->setPathEffect(nullptr);
     81 }
     82 
     83 static void discrete_pe(SkPaint* paint) {
     84     paint->setPathEffect(SkDiscretePathEffect::Make(10, 4));
     85 }
     86 
     87 static sk_sp<SkPathEffect> MakeTileEffect() {
     88     SkMatrix m;
     89     m.setScale(SkIntToScalar(12), SkIntToScalar(12));
     90 
     91     SkPath path;
     92     path.addCircle(0, 0, SkIntToScalar(5));
     93 
     94     return SkPath2DPathEffect::Make(m, path);
     95 }
     96 
     97 static void tile_pe(SkPaint* paint) {
     98     paint->setPathEffect(MakeTileEffect());
     99 }
    100 
    101 constexpr PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
    102 
    103 class PathEffectGM : public GM {
    104 public:
    105     PathEffectGM() {}
    106 
    107 protected:
    108 
    109     SkString onShortName() override {
    110         return SkString("patheffect");
    111     }
    112 
    113     SkISize onISize() override { return SkISize::Make(800, 600); }
    114 
    115     void onDraw(SkCanvas* canvas) override {
    116         SkPaint paint;
    117         paint.setAntiAlias(true);
    118         paint.setStyle(SkPaint::kStroke_Style);
    119 
    120         SkPath path;
    121         path.moveTo(20, 20);
    122         path.lineTo(70, 120);
    123         path.lineTo(120, 30);
    124         path.lineTo(170, 80);
    125         path.lineTo(240, 50);
    126 
    127         size_t i;
    128         canvas->save();
    129         for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
    130             gPE[i](&paint);
    131             canvas->drawPath(path, paint);
    132             canvas->translate(0, 75);
    133         }
    134         canvas->restore();
    135 
    136         path.reset();
    137         SkRect r = { 0, 0, 250, 120 };
    138         path.addOval(r, SkPath::kCW_Direction);
    139         r.inset(50, 50);
    140         path.addRect(r, SkPath::kCCW_Direction);
    141 
    142         canvas->translate(320, 20);
    143         for (i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
    144             gPE2[i](&paint);
    145             canvas->drawPath(path, paint);
    146             canvas->translate(0, 160);
    147         }
    148 
    149         SkIRect rect = SkIRect::MakeXYWH(20, 20, 60, 60);
    150         for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
    151             SkPaint p;
    152             p.setAntiAlias(true);
    153             p.setStyle(SkPaint::kFill_Style);
    154             gPE[i](&p);
    155             canvas->drawIRect(rect, p);
    156             canvas->translate(75, 0);
    157         }
    158     }
    159 
    160 private:
    161     typedef GM INHERITED;
    162 };
    163 
    164 //////////////////////////////////////////////////////////////////////////////
    165 
    166 static GM* PathEffectFactory(void*) { return new PathEffectGM; }
    167 static GMRegistry regPathEffect(PathEffectFactory);
    168 
    169 }
    170