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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 "SkBitmap.h"
     10 #include "SkPath.h"
     11 #include "SkPathOps.h"
     12 #include "SkRect.h"
     13 
     14 namespace skiagm {
     15 
     16 class PathOpsInverseGM : public GM {
     17 public:
     18     PathOpsInverseGM() {
     19     }
     20 
     21 protected:
     22     virtual void onOnceBeforeDraw() SK_OVERRIDE {
     23         const unsigned oneColor = 0xFF8080FF;
     24         const unsigned twoColor = 0x807F1f1f;
     25         SkColor blendColor = blend(oneColor, twoColor);
     26         makePaint(&fOnePaint, oneColor);
     27         makePaint(&fTwoPaint, twoColor);
     28         makePaint(&fOpPaint[kDifference_PathOp], oneColor);
     29         makePaint(&fOpPaint[kIntersect_PathOp], blendColor);
     30         makePaint(&fOpPaint[kUnion_PathOp], 0xFFc0FFc0);
     31         makePaint(&fOpPaint[kReverseDifference_PathOp], twoColor);
     32         makePaint(&fOpPaint[kXOR_PathOp], 0xFFa0FFe0);
     33         makePaint(&fOutlinePaint, 0xFF000000);
     34         fOutlinePaint.setStyle(SkPaint::kStroke_Style);
     35     }
     36 
     37     SkColor blend(SkColor one, SkColor two) {
     38         SkBitmap temp;
     39         temp.allocN32Pixels(1, 1);
     40         SkCanvas canvas(temp);
     41         canvas.drawColor(one);
     42         canvas.drawColor(two);
     43         void* pixels = temp.getPixels();
     44         return *(SkColor*) pixels;
     45     }
     46 
     47     void makePaint(SkPaint* paint, SkColor color) {
     48         paint->setAntiAlias(true);
     49         paint->setStyle(SkPaint::kFill_Style);
     50         paint->setColor(color);
     51     }
     52 
     53     virtual SkString onShortName() SK_OVERRIDE {
     54         return SkString("pathopsinverse");
     55     }
     56 
     57     virtual SkISize onISize() SK_OVERRIDE {
     58         return SkISize::Make(1200, 900);
     59     }
     60 
     61     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
     62         SkPath one, two;
     63         int yPos = 0;
     64         for (int oneFill = 0; oneFill <= 1; ++oneFill) {
     65             SkPath::FillType oneF = oneFill ? SkPath::kInverseEvenOdd_FillType
     66                     : SkPath::kEvenOdd_FillType;
     67             for (int twoFill = 0; twoFill <= 1; ++twoFill) {
     68                 SkPath::FillType twoF = twoFill ? SkPath::kInverseEvenOdd_FillType
     69                         : SkPath::kEvenOdd_FillType;
     70                 one.reset();
     71                 one.setFillType(oneF);
     72                 one.addRect(10, 10, 70, 70);
     73                 two.reset();
     74                 two.setFillType(twoF);
     75                 two.addRect(40, 40, 100, 100);
     76                 canvas->save();
     77                 canvas->translate(0, SkIntToScalar(yPos));
     78                 canvas->clipRect(SkRect::MakeWH(110, 110), SkRegion::kIntersect_Op, true);
     79                 canvas->drawPath(one, fOnePaint);
     80                 canvas->drawPath(one, fOutlinePaint);
     81                 canvas->drawPath(two, fTwoPaint);
     82                 canvas->drawPath(two, fOutlinePaint);
     83                 canvas->restore();
     84                 int xPos = 150;
     85                 for (int op = kDifference_PathOp; op <= kReverseDifference_PathOp; ++op) {
     86                     SkPath result;
     87                     Op(one, two, (SkPathOp) op, &result);
     88                     canvas->save();
     89                     canvas->translate(SkIntToScalar(xPos), SkIntToScalar(yPos));
     90                     canvas->clipRect(SkRect::MakeWH(110, 110), SkRegion::kIntersect_Op, true);
     91                     canvas->drawPath(result, fOpPaint[op]);
     92                     canvas->drawPath(result, fOutlinePaint);
     93                     canvas->restore();
     94                     xPos += 150;
     95                 }
     96                 yPos += 150;
     97             }
     98         }
     99     }
    100 
    101 private:
    102     SkPaint fOnePaint;
    103     SkPaint fTwoPaint;
    104     SkPaint fOutlinePaint;
    105     SkPaint fOpPaint[kReverseDifference_PathOp - kDifference_PathOp + 1];
    106     typedef GM INHERITED;
    107 };
    108 
    109 //////////////////////////////////////////////////////////////////////////////
    110 
    111 static GM* MyFactory(void*) { return new PathOpsInverseGM; }
    112 static GMRegistry reg(MyFactory);
    113 
    114 }
    115