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 REG_FIDDLE(Bitmap_extractAlpha, 256, 100, false, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6 SkBitmap alpha, bitmap;
7 bitmap.allocN32Pixels(100, 100);
8 SkCanvas offscreen(bitmap);
9 offscreen.clear(0);
10 SkPaint paint;
11 paint.setAntiAlias(true);
12 paint.setColor(SK_ColorBLUE);
13 paint.setStyle(SkPaint::kStroke_Style);
14 paint.setStrokeWidth(20);
15 offscreen.drawCircle(50, 50, 39, paint);
16 bitmap.extractAlpha(&alpha);
17 paint.setColor(SK_ColorRED);
18 canvas->drawImage(bitmap.asImage(), 0, 0, SkSamplingOptions(), &paint);
19 canvas->drawImage(alpha.asImage(), 100, 0, SkSamplingOptions(), &paint);
20 }
21 } // END FIDDLE
22