blob: b7e0fc4be3da4eb2fcca1cbd8026178b24a9462e [file] [log] [blame]
// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "tools/fiddle/examples.h"
// HASH=092739b4cd5d732a27c07ced8ef45f01
REG_FIDDLE(Bitmap_extractAlpha_2, 256, 160, false, 0) {
void draw(SkCanvas* canvas) {
auto radiusToSigma = [](SkScalar radius) -> SkScalar {
static const SkScalar kBLUR_SIGMA_SCALE = 0.57735f;
return radius > 0 ? kBLUR_SIGMA_SCALE * radius + 0.5f : 0.0f;
};
SkBitmap alpha, bitmap;
bitmap.allocN32Pixels(100, 100);
SkCanvas offscreen(bitmap);
offscreen.clear(0);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorBLUE);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(20);
offscreen.drawCircle(50, 50, 39, paint);
paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle, radiusToSigma(25)));
SkIPoint offset;
bitmap.extractAlpha(&alpha, &paint, &offset);
paint.setColor(SK_ColorRED);
canvas->drawImage(bitmap.asImage(), 0, -offset.fY, SkSamplingOptions(), &paint);
canvas->drawImage(alpha.asImage(), 100 + offset.fX, 0, SkSamplingOptions(), &paint);
}
} // END FIDDLE