gm/pathopsinverse.cpp

   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     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     SkString onShortName() SK_OVERRIDE {
  54         return SkString("pathopsinverse");
  55     }
  56
  57     SkISize onISize() SK_OVERRIDE {
  58         return SkISize::Make(1200, 900);
  59     }
  60
  61     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 }