skia2/docs/examples/no_gpu_blur.cpp
Hal Canary 6c8422c671 add more docs/examples from named fiddles.
ignore offscreen, srgb, and animated fiddles for now.

Change-Id: I923131b684865698e6cda138b004930e11f504d5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263713
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2020-01-14 19:22:26 +00:00

25 lines
906 B
C++

// Copyright 2020 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"
REG_FIDDLE(no_gpu_blur, 256, 256, false, 0) {
void draw(SkCanvas* canvas) {
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);
offscreen.flush();
paint.setMaskFilter(SkMaskFilter::MakeBlur(kOuter_SkBlurStyle, 3));
SkIPoint offset;
bitmap.extractAlpha(&alpha, &paint, nullptr, &offset);
paint.setColor(SK_ColorRED);
canvas->drawBitmap(bitmap, 0, -offset.fY, &paint);
canvas->drawBitmap(alpha, 100 + offset.fX, 0, &paint);
}
} // END FIDDLE