| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkBitmap.h" |
| #include "include/core/SkCanvas.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPath.h" |
| #include "samplecode/Sample.h" |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class LayerMaskView : public Sample { |
| public: |
| LayerMaskView() { |
| this->setBGColor(0xFFDDDDDD); |
| } |
| |
| protected: |
| virtual SkString name() { return SkString("LayerMask"); } |
| |
| void drawMask(SkCanvas* canvas, const SkRect& r) { |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| if (true) { |
| SkBitmap mask; |
| int w = SkScalarRoundToInt(r.width()); |
| int h = SkScalarRoundToInt(r.height()); |
| mask.allocN32Pixels(w, h); |
| mask.eraseColor(SK_ColorTRANSPARENT); |
| SkCanvas c(mask); |
| SkRect bounds = r; |
| bounds.offset(-bounds.fLeft, -bounds.fTop); |
| c.drawOval(bounds, paint); |
| |
| paint.setBlendMode(SkBlendMode::kDstIn); |
| canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint); |
| } else { |
| SkPath p; |
| p.addOval(r); |
| p.setFillType(SkPath::kInverseWinding_FillType); |
| paint.setBlendMode(SkBlendMode::kDstOut); |
| canvas->drawPath(p, paint); |
| } |
| } |
| |
| virtual void onDrawContent(SkCanvas* canvas) { |
| SkRect r; |
| r.set(SkIntToScalar(20), SkIntToScalar(20), SkIntToScalar(120), SkIntToScalar(120)); |
| canvas->saveLayer(&r, nullptr); |
| canvas->drawColor(SK_ColorRED); |
| drawMask(canvas, r); |
| canvas->restore(); |
| } |
| |
| private: |
| typedef Sample INHERITED; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_SAMPLE( return new LayerMaskView(); ) |