use unique_ptr for stream api

Bug: skia:6888
Change-Id: I3459b4913982a7cae1c0061697c82cc65ad9a2d8
Reviewed-on: https://skia-review.googlesource.com/26740
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>

3 files changed, 47 insertions, 13 deletions

diff --git a/src/utils/SkFrontBufferedStream.cpp b/src/utils/SkFrontBufferedStream.cpp
index 42b86f09e3..77c484af64 100644
--- a/src/utils/SkFrontBufferedStream.cpp
+++ b/src/utils/SkFrontBufferedStream.cpp
@@ -11,8 +11,8 @@
 
 class FrontBufferedStream : public SkStreamRewindable {
 public:
-    // Called by Create.
-    FrontBufferedStream(SkStream*, size_t bufferSize);
+    // Called by Make.
+    FrontBufferedStream(std::unique_ptr<SkStream>, size_t bufferSize);
 
     size_t read(void* buffer, size_t size) override;
 
@@ -26,9 +26,15 @@ public:
 
     size_t getLength() const override { return fLength; }
 
+#ifdef SK_SUPPORT_LEGACY_STREAM_API
     SkStreamRewindable* duplicate() const override { return nullptr; }
+#endif
 
 private:
+#ifndef SK_SUPPORT_LEGACY_STREAM_API
+    SkStreamRewindable* onDuplicate() const override { return nullptr; }
+#endif
+
     std::unique_ptr<SkStream> fStream;
     const bool                fHasLength;
     const size_t              fLength;
@@ -61,17 +67,19 @@ private:
     typedef SkStream INHERITED;
 };
 
-SkStreamRewindable* SkFrontBufferedStream::Create(SkStream* stream, size_t bufferSize) {
-    if (nullptr == stream) {
+std::unique_ptr<SkStreamRewindable> SkFrontBufferedStream::Make(std::unique_ptr<SkStream> stream,
+                                                                size_t bufferSize) {
+    if (!stream) {
         return nullptr;
     }
-    return new FrontBufferedStream(stream, bufferSize);
+    return std::unique_ptr<SkStreamRewindable>(new FrontBufferedStream(std::move(stream),
+                                                                       bufferSize));
 }
 
-FrontBufferedStream::FrontBufferedStream(SkStream* stream, size_t bufferSize)
-    : fStream(stream)
-    , fHasLength(stream->hasPosition() && stream->hasLength())
-    , fLength(stream->getLength() - stream->getPosition())
+FrontBufferedStream::FrontBufferedStream(std::unique_ptr<SkStream> stream, size_t bufferSize)
+    : fStream(std::move(stream))
+    , fHasLength(fStream->hasPosition() && fStream->hasLength())
+    , fLength(fStream->getLength() - fStream->getPosition())
     , fOffset(0)
     , fBufferedSoFar(0)
     , fBufferSize(bufferSize)
diff --git a/src/utils/win/SkDWriteFontFileStream.cpp b/src/utils/win/SkDWriteFontFileStream.cpp
index 2bb7d0fb4e..a43e163481 100644
--- a/src/utils/win/SkDWriteFontFileStream.cpp
+++ b/src/utils/win/SkDWriteFontFileStream.cpp
@@ -86,7 +86,12 @@ bool SkDWriteFontFileStream::rewind() {
     return true;
 }
 
-SkDWriteFontFileStream* SkDWriteFontFileStream::duplicate() const {
+#ifdef SK_SUPPORT_LEGACY_STREAM_API
+SkDWriteFontFileStream* SkDWriteFontFileStream::duplicate() const
+#else
+SkDWriteFontFileStream* SkDWriteFontFileStream::onDuplicate() const
+#endif
+{
     return new SkDWriteFontFileStream(fFontFileStream.get());
 }
 
@@ -104,7 +109,12 @@ bool SkDWriteFontFileStream::move(long offset) {
     return seek(fPos + offset);
 }
 
-SkDWriteFontFileStream* SkDWriteFontFileStream::fork() const {
+#ifdef SK_SUPPORT_LEGACY_STREAM_API
+SkDWriteFontFileStream* SkDWriteFontFileStream::fork() const
+#else
+SkDWriteFontFileStream* SkDWriteFontFileStream::onFork() const
+#endif
+{
     std::unique_ptr<SkDWriteFontFileStream> that(this->duplicate());
     that->seek(fPos);
     return that.release();
diff --git a/src/utils/win/SkDWriteFontFileStream.h b/src/utils/win/SkDWriteFontFileStream.h
index 25322c5657..9b65752382 100644
--- a/src/utils/win/SkDWriteFontFileStream.h
+++ b/src/utils/win/SkDWriteFontFileStream.h
@@ -28,15 +28,31 @@ public:
     size_t read(void* buffer, size_t size) override;
     bool isAtEnd() const override;
     bool rewind() override;
-    SkDWriteFontFileStream* duplicate() const override;
     size_t getPosition() const override;
     bool seek(size_t position) override;
     bool move(long offset) override;
-    SkDWriteFontFileStream* fork() const override;
     size_t getLength() const override;
     const void* getMemoryBase() override;
 
+#ifdef SK_SUPPORT_LEGACY_STREAM_API
+    SkDWriteFontFileStream* duplicate() const override;
+    SkDWriteFontFileStream* fork() const override;
+#else
+    std::unique_ptr<SkDWriteFontFileStream> duplicate() const {
+        return std::unique_ptr<SkDWriteFontFileStream>(this->onDuplicate());
+    }
+    std::unique_ptr<SkDWriteFontFileStream> fork() const {
+        return std::unique_ptr<SkDWriteFontFileStream>(this->onFork());
+    }
+#endif
+
+
 private:
+#ifndef SK_SUPPORT_LEGACY_STREAM_API
+    SkDWriteFontFileStream* onDuplicate() const override;
+    SkDWriteFontFileStream* onFork() const override;
+#endif
+
     SkTScopedComPtr<IDWriteFontFileStream> fFontFileStream;
     size_t fPos;
     const void* fLockedMemory;