1// Copyright 2019 Google LLC.
2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3#include "tools/fiddle/examples.h"
4// HASH=cd7543fa8c9f3cede46dc2d72eb8c4bd
5REG_FIDDLE(Bitmap_extractAlpha_3, 256, 128, false, 0) {
6void draw(SkCanvas* canvas) {
7    SkBitmap alpha, bitmap;
8    bitmap.allocN32Pixels(100, 100);
9    SkCanvas offscreen(bitmap);
10    offscreen.clear(0);
11    SkPaint paint;
12    paint.setAntiAlias(true);
13    paint.setColor(SK_ColorBLUE);
14    paint.setStyle(SkPaint::kStroke_Style);
15    paint.setStrokeWidth(20);
16    offscreen.drawCircle(50, 50, 39, paint);
17    offscreen.flush();
18    paint.setMaskFilter(SkMaskFilter::MakeBlur(kOuter_SkBlurStyle, 3));
19    SkIPoint offset;
20    bitmap.extractAlpha(&alpha, &paint, nullptr, &offset);
21    paint.setColor(SK_ColorRED);
22    canvas->drawImage(bitmap.asImage(), 0, -offset.fY, SkSamplingOptions(), &paint);
23    canvas->drawImage(alpha.asImage(), 100 + offset.fX, 0, SkSamplingOptions(), &paint);
24}
25}  // END FIDDLE
26