Bitmap_extractAlpha_3.cpp 957 B

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  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) {
  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->drawBitmap(bitmap, 0, -offset.fY, &paint);
  23. canvas->drawBitmap(alpha, 100 + offset.fX, 0, &paint);
  24. }
  25. } // END FIDDLE