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
5 REG_FIDDLE(Bitmap_extractAlpha, 256, 100, false, 0) {
draw(SkCanvas * canvas)6 void 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