reed@android.com | 311c82d | 2009-05-05 23:13:23 +0000 | [diff] [blame] | 1 | #include "SampleCode.h" |
| 2 | #include "SkCanvas.h" |
| 3 | #include "SkPaint.h" |
reed@android.com | 311c82d | 2009-05-05 23:13:23 +0000 | [diff] [blame] | 4 | #include "SkView.h" |
| 5 | |
| 6 | /////////////////////////////////////////////////////////////////////////////// |
| 7 | |
| 8 | class LayerMaskView : public SkView { |
| 9 | public: |
| 10 | LayerMaskView() {} |
| 11 | |
| 12 | protected: |
| 13 | // overrides from SkEventSink |
| 14 | virtual bool onQuery(SkEvent* evt) { |
| 15 | if (SampleCode::TitleQ(*evt)) { |
| 16 | SampleCode::TitleR(evt, "LayerMask"); |
| 17 | return true; |
| 18 | } |
| 19 | return this->INHERITED::onQuery(evt); |
| 20 | } |
| 21 | |
| 22 | void drawMask(SkCanvas* canvas, const SkRect& r) { |
| 23 | SkPaint paint; |
| 24 | paint.setAntiAlias(true); |
| 25 | |
| 26 | if (true) { |
| 27 | SkBitmap mask; |
| 28 | int w = SkScalarRound(r.width()); |
| 29 | int h = SkScalarRound(r.height()); |
| 30 | mask.setConfig(SkBitmap::kARGB_8888_Config, w, h); |
| 31 | mask.allocPixels(); |
| 32 | mask.eraseColor(0); |
| 33 | SkCanvas c(mask); |
| 34 | SkRect bounds = r; |
| 35 | bounds.offset(-bounds.fLeft, -bounds.fTop); |
| 36 | c.drawOval(bounds, paint); |
| 37 | |
reed@android.com | 0baf193 | 2009-06-24 12:41:42 +0000 | [diff] [blame^] | 38 | paint.setXfermodeMode(SkXfermode::kDstIn_Mode); |
reed@android.com | 311c82d | 2009-05-05 23:13:23 +0000 | [diff] [blame] | 39 | canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint); |
| 40 | } else { |
| 41 | SkPath p; |
| 42 | p.addOval(r); |
| 43 | p.setFillType(SkPath::kInverseWinding_FillType); |
reed@android.com | 0baf193 | 2009-06-24 12:41:42 +0000 | [diff] [blame^] | 44 | paint.setXfermodeMode(SkXfermode::kDstOut_Mode); |
reed@android.com | 311c82d | 2009-05-05 23:13:23 +0000 | [diff] [blame] | 45 | canvas->drawPath(p, paint); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | void drawBG(SkCanvas* canvas) { |
| 50 | canvas->drawColor(0xFFDDDDDD); |
| 51 | } |
| 52 | |
| 53 | virtual void onDraw(SkCanvas* canvas) { |
| 54 | this->drawBG(canvas); |
| 55 | |
| 56 | SkRect r; |
| 57 | r.set(SkIntToScalar(20), SkIntToScalar(20), SkIntToScalar(120), SkIntToScalar(120)); |
| 58 | canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag); |
| 59 | canvas->drawColor(SK_ColorRED); |
| 60 | drawMask(canvas, r); |
| 61 | canvas->restore(); |
| 62 | } |
| 63 | |
| 64 | private: |
| 65 | typedef SkView INHERITED; |
| 66 | }; |
| 67 | |
| 68 | /////////////////////////////////////////////////////////////////////////////// |
| 69 | |
| 70 | static SkView* MyFactory() { return new LayerMaskView; } |
| 71 | static SkViewRegister reg(MyFactory); |
| 72 | |