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      1 /*
      2  * Copyright 2013 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 
      8 #include "gm.h"
      9 #include "SkPath.h"
     10 #include "SkRandom.h"
     11 #include "SkRRect.h"
     12 
     13 namespace skiagm {
     14 
     15 // Test out various combinations of nested rects, ovals and rrects.
     16 class NestedGM : public GM {
     17 public:
     18     NestedGM(bool doAA, bool flipped) : fDoAA(doAA), fFlipped(flipped) {
     19         this->setBGColor(0xFFDDDDDD);
     20     }
     21 
     22 protected:
     23 
     24     SkString onShortName() override {
     25         SkString name("nested");
     26         if (fFlipped) {
     27             name.append("_flipY");
     28         }
     29         if (fDoAA) {
     30             name.append("_aa");
     31         } else {
     32             name.append("_bw");
     33         }
     34         return name;
     35     }
     36 
     37     SkISize onISize() override {
     38         return SkISize::Make(kImageWidth, kImageHeight);
     39     }
     40 
     41     enum Shapes {
     42         kRect_Shape = 0,
     43         kRRect_Shape,
     44         kOval_Shape,
     45         kShapeCount
     46     };
     47 
     48     static void AddShape(SkPath* path, const SkRect& rect, Shapes shape, SkPath::Direction dir) {
     49         switch (shape) {
     50             case kRect_Shape:
     51                 path->addRect(rect, dir);
     52                 break;
     53             case kRRect_Shape: {
     54                 SkRRect rr;
     55                 rr.setRectXY(rect, 5, 5);
     56                 path->addRRect(rr, dir);
     57                 break;
     58                 }
     59             case kOval_Shape:
     60                 path->addOval(rect, dir);
     61                 break;
     62             default:
     63                 break;
     64         }
     65     }
     66 
     67     void onDraw(SkCanvas* canvas) override {
     68 
     69         SkPaint shapePaint;
     70         shapePaint.setColor(SK_ColorBLACK);
     71         shapePaint.setAntiAlias(fDoAA);
     72 
     73         SkRect outerRect = SkRect::MakeWH(40, 40);
     74 
     75         SkRect innerRects[] = {
     76             { 10, 10, 30, 30 },     // small
     77             { .5f, 18, 4.5f, 22 }   // smaller and offset to left
     78         };
     79 
     80         // draw a background pattern to make transparency errors more apparent
     81         SkRandom rand;
     82 
     83         for (int y = 0; y < kImageHeight; y += 10) {
     84             for (int x = 0; x < kImageWidth; x += 10) {
     85                 SkRect r = SkRect::MakeXYWH(SkIntToScalar(x),
     86                                             SkIntToScalar(y),
     87                                             10, 10);
     88                 SkPaint p;
     89                 p.setColor(rand.nextU() | 0xFF000000);
     90                 canvas->drawRect(r, p);
     91             }
     92         }
     93 
     94         SkScalar xOff = 2, yOff = 2;
     95         for (int outerShape = 0; outerShape < kShapeCount; ++outerShape) {
     96             for (int innerShape = 0; innerShape < kShapeCount; ++innerShape) {
     97                 for (size_t innerRect = 0; innerRect < SK_ARRAY_COUNT(innerRects); ++innerRect) {
     98                     SkPath path;
     99 
    100                     AddShape(&path, outerRect, (Shapes) outerShape, SkPath::kCW_Direction);
    101                     AddShape(&path, innerRects[innerRect], (Shapes) innerShape,
    102                              SkPath::kCCW_Direction);
    103 
    104                     canvas->save();
    105                     if (fFlipped) {
    106                         canvas->scale(1.0f, -1.0f);
    107                         canvas->translate(xOff, -yOff - 40.0f);
    108                     } else {
    109                         canvas->translate(xOff, yOff);
    110                     }
    111 
    112                     canvas->drawPath(path, shapePaint);
    113                     canvas->restore();
    114 
    115                     xOff += 45;
    116                 }
    117             }
    118 
    119             xOff = 2;
    120             yOff += 45;
    121         }
    122 
    123     }
    124 
    125 private:
    126     static constexpr int kImageWidth = 269;
    127     static constexpr int kImageHeight = 134;
    128 
    129     bool fDoAA;
    130     bool fFlipped;
    131 
    132     typedef GM INHERITED;
    133 };
    134 
    135 ///////////////////////////////////////////////////////////////////////////////
    136 
    137 DEF_GM( return new NestedGM(/* doAA = */ true,  /* flipped = */ false); )
    138 DEF_GM( return new NestedGM(/* doAA = */ false, /* flipped = */ false); )
    139 DEF_GM( return new NestedGM(/* doAA = */ true,  /* flipped = */ true); )
    140 DEF_GM( return new NestedGM(/* doAA = */ false, /* flipped = */ true); )
    141 
    142 }
    143