Pixmap_writable_addr32.cpp 1023 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=086866243bf9e4c14c3b215a2aa69ad9
  5. REG_FIDDLE(Pixmap_writable_addr32, 256, 72, false, 4) {
  6. void draw(SkCanvas* canvas) {
  7. std::vector<int32_t> pixels;
  8. pixels.resize(image->height() * image->width() * 4);
  9. SkPixmap pixmap(SkImageInfo::Make(image->width(), image->height(), kN32_SkColorType,
  10. image->alphaType()), (const void*) &pixels.front(), image->width() * 4);
  11. image->readPixels(pixmap, 0, 0);
  12. for (int y = 0; y < pixmap.height() / 2; ++y) {
  13. for (int x = 0; x < pixmap.width(); ++x) {
  14. if ((x & 4) == (y & 4)) {
  15. *pixmap.writable_addr32(x, y) =
  16. *pixmap.writable_addr32(pixmap.width() - x - 1, pixmap.height() - y - 1);
  17. }
  18. }
  19. }
  20. SkBitmap bitmap;
  21. bitmap.installPixels(pixmap);
  22. canvas->drawBitmap(bitmap, 0, 0);
  23. }
  24. } // END FIDDLE