skia2/samplecode/SampleLayerMask.cpp
Hal Canary 8a027312cd Samples: add name() virtual
Change-Id: I9b6e39bc7e35346bb73dfe014de1c8daa5a92f2a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/225428
Auto-Submit: Hal Canary <halcanary@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2019-07-03 17:41:16 +00:00

67 lines
1.9 KiB
C++

/*
* 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(); )