Canvas_const_SkBitmap_const_SkSurfaceProps.cpp 1.3 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=c26cfae4c42cb445240335cc12a50235
  5. REG_FIDDLE(Canvas_const_SkBitmap_const_SkSurfaceProps, 256, 256, true, 0) {
  6. void draw(SkCanvas* ) {
  7. SkBitmap bitmap;
  8. // create a bitmap 5 wide and 11 high
  9. bitmap.allocPixels(SkImageInfo::MakeN32Premul(5, 11));
  10. SkCanvas canvas(bitmap, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
  11. canvas.clear(SK_ColorWHITE); // white is Unpremultiplied, in ARGB order
  12. SkPixmap pixmap; // provides guaranteed access to the drawn pixels
  13. if (!canvas.peekPixels(&pixmap)) {
  14. SkDebugf("peekPixels should never fail.\n");
  15. }
  16. const SkPMColor* pixels = pixmap.addr32(); // points to top-left of bitmap
  17. SkPMColor pmWhite = pixels[0]; // the Premultiplied format may vary
  18. SkPaint paint; // by default, draws black, 12 point text
  19. SkFont font;
  20. canvas.drawString("!", 1, 10, font, paint); // 1 char at baseline (1, 10)
  21. for (int y = 0; y < bitmap.height(); ++y) {
  22. for (int x = 0; x < bitmap.width(); ++x) {
  23. SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x');
  24. }
  25. SkDebugf("\n");
  26. }
  27. }
  28. } // END FIDDLE