Canvas_accessTopRasterHandle.cpp 1.2 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=4486d0c0b22ad2931db130f42da4c80c
  5. REG_FIDDLE(Canvas_accessTopRasterHandle, 256, 256, true, 0) {
  6. static void DeleteCallback(void*, void* context) {
  7. delete (char*) context;
  8. }
  9. class CustomAllocator : public SkRasterHandleAllocator {
  10. public:
  11. bool allocHandle(const SkImageInfo& info, Rec* rec) override {
  12. char* context = new char[4]{'s', 'k', 'i', 'a'};
  13. rec->fReleaseProc = DeleteCallback;
  14. rec->fReleaseCtx = context;
  15. rec->fHandle = context;
  16. rec->fPixels = context;
  17. rec->fRowBytes = 4;
  18. return true;
  19. }
  20. void updateHandle(Handle handle, const SkMatrix& ctm, const SkIRect& clip_bounds) override {
  21. // apply canvas matrix and clip to custom environment
  22. }
  23. };
  24. void draw(SkCanvas* canvas) {
  25. const SkImageInfo info = SkImageInfo::MakeN32Premul(1, 1);
  26. std::unique_ptr<SkCanvas> c2 =
  27. SkRasterHandleAllocator::MakeCanvas(std::unique_ptr<CustomAllocator>(
  28. new CustomAllocator()), info);
  29. char* context = (char*) c2->accessTopRasterHandle();
  30. SkDebugf("context = %.4s\n", context);
  31. }
  32. } // END FIDDLE