ImageInfo_makeAlphaType.cpp 1.4 KB

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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=e72db006f1bea26feceaef8727ff9818
  5. REG_FIDDLE(ImageInfo_makeAlphaType, 256, 256, false, 3) {
  6. void draw(SkCanvas* canvas) {
  7. const int width = 256;
  8. const int height = 128;
  9. SkColor pixels[height][width];
  10. for (int y = 0; y < height; ++y) {
  11. for (int x = 0; x < width; ++x) {
  12. int red = SkScalarRoundToInt(255 * SkScalarAbs(SkScalarSin((x * 4 + y) * 0.03f)));
  13. int blue = SkScalarRoundToInt(255 * SkScalarAbs(SkScalarCos((x * 3 + y) * 0.04f)));
  14. int green = SkScalarRoundToInt(255 * SkScalarAbs(SkScalarSin((x * 2 + y) * 0.05f)));
  15. int alpha = SkScalarRoundToInt(255 * SkScalarAbs(SkScalarCos((x * 1 + y) * 0.006f)));
  16. pixels[y][x] =
  17. SkColorSetARGB(alpha, red * alpha / 255, green * alpha / 255, blue * alpha / 255);
  18. }
  19. }
  20. SkBitmap bitmap;
  21. SkImageInfo info = SkImageInfo::Make(width, height, kBGRA_8888_SkColorType, kPremul_SkAlphaType);
  22. bitmap.installPixels(info, (void*) pixels, sizeof(SkColor) * width);
  23. canvas->drawBitmap(source, 0, 0);
  24. canvas->drawBitmap(bitmap, 0, 0);
  25. SkImageInfo unpremulInfo = info.makeAlphaType(kUnpremul_SkAlphaType);
  26. bitmap.installPixels(unpremulInfo, (void*) pixels, sizeof(SkColor) * width);
  27. canvas->drawBitmap(bitmap, 0, 128);
  28. }
  29. } // END FIDDLE