зеркало из https://github.com/mozilla/moz-skia.git
74 строки
2.1 KiB
C++
74 строки
2.1 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SampleCode.h"
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#include "SkCanvas.h"
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#include "SkPaint.h"
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#include "SkView.h"
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///////////////////////////////////////////////////////////////////////////////
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class LayerMaskView : public SampleView {
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public:
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LayerMaskView() {
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this->setBGColor(0xFFDDDDDD);
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "LayerMask");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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void drawMask(SkCanvas* canvas, const SkRect& r) {
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SkPaint paint;
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paint.setAntiAlias(true);
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if (true) {
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SkBitmap mask;
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int w = SkScalarRoundToInt(r.width());
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int h = SkScalarRoundToInt(r.height());
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mask.allocN32Pixels(w, h);
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mask.eraseColor(SK_ColorTRANSPARENT);
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SkCanvas c(mask);
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SkRect bounds = r;
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bounds.offset(-bounds.fLeft, -bounds.fTop);
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c.drawOval(bounds, paint);
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paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
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canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint);
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} else {
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SkPath p;
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p.addOval(r);
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p.setFillType(SkPath::kInverseWinding_FillType);
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paint.setXfermodeMode(SkXfermode::kDstOut_Mode);
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canvas->drawPath(p, paint);
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}
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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SkRect r;
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r.set(SkIntToScalar(20), SkIntToScalar(20), SkIntToScalar(120), SkIntToScalar(120));
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canvas->saveLayer(&r, NULL, SkCanvas::kARGB_ClipLayer_SaveFlag);
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canvas->drawColor(SK_ColorRED);
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drawMask(canvas, r);
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canvas->restore();
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}
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private:
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typedef SampleView INHERITED;
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};
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///////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new LayerMaskView; }
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static SkViewRegister reg(MyFactory);
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