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=ab6577df079e6c70511cf2bfc6447b44
5REG_FIDDLE(Bitmap_extractAlpha, 256, 100, 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    bitmap.extractAlpha(&alpha);
19    paint.setColor(SK_ColorRED);
20    canvas->drawImage(bitmap.asImage(), 0, 0, SkSamplingOptions(), &paint);
21    canvas->drawImage(alpha.asImage(), 100, 0, SkSamplingOptions(), &paint);
22}
23}  // END FIDDLE
24