add pipecanvas

src/core/SkPipe.h

+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkPipe_DEFINED
+#define SkPipe_DEFINED
+
+#include "SkTypes.h"
+
+class SkCanvas;
+class SkImage;
+class SkPicture;
+class SkTypefaceSerializer;
+class SkTypefaceDeserializer;
+class SkWStream;
+
+class SkPipeSerializer {
+public:
+    SkPipeSerializer();
+    ~SkPipeSerializer();
+
+    // Ownership is not transferred, so caller must ceep the serializer alive

[hal.canary, 2016/09/13 15:52:54]

s/ceep/keep/

+    void setTypefaceSerializer(SkTypefaceSerializer*);
+
+    void resetCache();
+
+    void write(SkPicture*, SkWStream*);
+    void write(SkImage*, SkWStream*);
+
+    SkCanvas* beginWrite(const SkRect& cullBounds, SkWStream*);
+    void endWrite();
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> fImpl;
+};
+
+class SkPipeDeserializer {
+public:
+    SkPipeDeserializer();
+    ~SkPipeDeserializer();
+
+    // Ownership is not transferred, so caller must ceep the deserializer alive
+    void setTypefaceDeserializer(SkTypefaceDeserializer*);
+
+    sk_sp<SkPicture> readPicture(const void*, size_t);
+    sk_sp<SkImage> readImage(const void*, size_t);
+    bool playback(const void*, size_t, SkCanvas*);
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> fImpl;
+};
+
+//////////////////////////////////////////////////////////////////////////////////////////////////
+
+class SkTypefaceSerializer {
+public:
+    virtual ~SkTypefaceSerializer() {}
+
+    virtual sk_sp<SkData> serialize(SkTypeface*) = 0;
+};
+
+class SkTypefaceDeserializer {
+public:
+    virtual ~SkTypefaceDeserializer() {}
+
+    virtual sk_sp<SkTypeface> deserialize(const void* data, size_t size) = 0;
+};
+
+#endif