Bitmap_readPixels_2.cpp 1.0 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=e9f70cbc9827097449a386ec7a8a8188
  5. REG_FIDDLE(Bitmap_readPixels_2, 256, 256, false, 3) {
  6. void draw(SkCanvas* canvas) {
  7. std::vector<int32_t> srcPixels;
  8. srcPixels.resize(source.height() * source.rowBytes());
  9. for (int y = 0; y < 4; ++y) {
  10. for (int x = 0; x < 4; ++x) {
  11. SkPixmap pixmap(SkImageInfo::MakeN32Premul(source.width() / 4, source.height() / 4),
  12. &srcPixels.front() + x * source.height() * source.width() / 4 +
  13. y * source.width() / 4, source.rowBytes());
  14. source.readPixels(pixmap, x * source.width() / 4, y * source.height() / 4);
  15. }
  16. }
  17. canvas->scale(.5f, .5f);
  18. SkBitmap bitmap;
  19. bitmap.installPixels(SkImageInfo::MakeN32Premul(source.width(), source.height()),
  20. &srcPixels.front(), source.rowBytes());
  21. canvas->drawBitmap(bitmap, 0, 0);
  22. }
  23. } // END FIDDLE