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
5 REG_FIDDLE(Bitmap_extractAlpha_3, 256, 128, 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 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