SkStream_mac.cpp 2.5 KB

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  1. /*
  2. * Copyright 2012 Google Inc.
  3. *
  4. * Use of this source code is governed by a BSD-style license that can be
  5. * found in the LICENSE file.
  6. */
  7. #include "include/core/SkTypes.h"
  8. #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
  9. #include "include/core/SkStream.h"
  10. #include "include/private/SkMalloc.h"
  11. #include "include/utils/mac/SkCGUtils.h"
  12. // These are used by CGDataProviderCreateWithData
  13. static void unref_proc(void* info, const void* addr, size_t size) {
  14. SkASSERT(info);
  15. ((SkRefCnt*)info)->unref();
  16. }
  17. static void delete_stream_proc(void* info, const void* addr, size_t size) {
  18. SkASSERT(info);
  19. SkStream* stream = (SkStream*)info;
  20. SkASSERT(stream->getMemoryBase() == addr);
  21. SkASSERT(stream->getLength() == size);
  22. delete stream;
  23. }
  24. // These are used by CGDataProviderSequentialCallbacks
  25. static size_t get_bytes_proc(void* info, void* buffer, size_t bytes) {
  26. SkASSERT(info);
  27. return ((SkStream*)info)->read(buffer, bytes);
  28. }
  29. static off_t skip_forward_proc(void* info, off_t bytes) {
  30. return ((SkStream*)info)->skip((size_t) bytes);
  31. }
  32. static void rewind_proc(void* info) {
  33. SkASSERT(info);
  34. ((SkStream*)info)->rewind();
  35. }
  36. // Used when info is an SkStream.
  37. static void release_info_proc(void* info) {
  38. SkASSERT(info);
  39. delete (SkStream*)info;
  40. }
  41. CGDataProviderRef SkCreateDataProviderFromStream(std::unique_ptr<SkStreamRewindable> stream) {
  42. // TODO: Replace with SkStream::getData() when that is added. Then we only
  43. // have one version of CGDataProviderCreateWithData (i.e. same release proc)
  44. const void* addr = stream->getMemoryBase();
  45. if (addr) {
  46. // special-case when the stream is just a block of ram
  47. size_t size = stream->getLength();
  48. return CGDataProviderCreateWithData(stream.release(), addr, size, delete_stream_proc);
  49. }
  50. CGDataProviderSequentialCallbacks rec;
  51. sk_bzero(&rec, sizeof(rec));
  52. rec.version = 0;
  53. rec.getBytes = get_bytes_proc;
  54. rec.skipForward = skip_forward_proc;
  55. rec.rewind = rewind_proc;
  56. rec.releaseInfo = release_info_proc;
  57. return CGDataProviderCreateSequential(stream.release(), &rec);
  58. }
  59. ///////////////////////////////////////////////////////////////////////////////
  60. #include "include/core/SkData.h"
  61. CGDataProviderRef SkCreateDataProviderFromData(sk_sp<SkData> data) {
  62. const void* addr = data->data();
  63. size_t size = data->size();
  64. return CGDataProviderCreateWithData(data.release(), addr, size, unref_proc);
  65. }
  66. #endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)