Bitmap_extractAlpha.cpp 815 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=ab6577df079e6c70511cf2bfc6447b44
  5. REG_FIDDLE(Bitmap_extractAlpha, 256, 100, 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. bitmap.extractAlpha(&alpha);
  19. paint.setColor(SK_ColorRED);
  20. canvas->drawBitmap(bitmap, 0, 0, &paint);
  21. canvas->drawBitmap(alpha, 100, 0, &paint);
  22. }
  23. } // END FIDDLE