1 /* 2 * Copyright 2016 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 #ifndef SkMultiPictureDocumentReader_DEFINED 8 #define SkMultiPictureDocumentReader_DEFINED 9 10 #include "../private/SkTArray.h" 11 #include "SkPicture.h" 12 #include "SkSize.h" 13 #include "SkStream.h" 14 15 /** A lightweight helper class for reading a Skia MultiPictureDocument. */ 16 class SkMultiPictureDocumentReader { 17 public: 18 /** Initialize the MultiPictureDocument. Does not take ownership 19 of the SkStreamSeekable. */ 20 bool init(SkStreamSeekable*); 21 22 /** Return to factory settings. */ reset()23 void reset() { 24 fSizes.reset(); 25 fPages.reset(); 26 } 27 28 /** Call this after calling init() (otherwise you'll always get zero). */ pageCount()29 int pageCount() const { return fSizes.count(); } 30 31 /** Deserialize a page from the stream. Call init() first. The 32 SkStreamSeekable doesn't need to be the same object, but 33 should point to the same information as before. */ 34 sk_sp<SkPicture> readPage(SkStreamSeekable*, int) const; 35 36 /** Fetch the size of the given page, without deserializing the 37 entire page. */ pageSize(int i)38 SkSize pageSize(int i) const { return fSizes[i]; } 39 40 private: 41 SkTArray<SkSize> fSizes; 42 size_t fOffset; 43 mutable SkTArray<sk_sp<SkPicture>> fPages; 44 }; 45 46 #endif // SkMultiPictureDocumentReader_DEFINED 47