| /* |
| * Copyright 2010 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #ifndef SkFlate_DEFINED |
| #define SkFlate_DEFINED |
| |
| #include "include/core/SkStream.h" |
| |
| /** |
| * Wrap a stream in this class to compress the information written to |
| * this stream using the Deflate algorithm. |
| * |
| * See http://en.wikipedia.org/wiki/DEFLATE |
| */ |
| class SkDeflateWStream final : public SkWStream { |
| public: |
| /** Does not take ownership of the stream. |
| |
| @param compressionLevel 1 is best speed; 9 is best compression. |
| The default, -1, is to use zlib's Z_DEFAULT_COMPRESSION level. |
| 0 would be no compression, but due to broken zlibs, users should handle that themselves. |
| |
| @param gzip iff true, output a gzip file. "The gzip format is |
| a wrapper, documented in RFC 1952, around a deflate stream." |
| gzip adds a header with a magic number to the beginning of the |
| stream, allowing a client to identify a gzip file. |
| */ |
| SkDeflateWStream(SkWStream*, |
| int compressionLevel, |
| bool gzip = false); |
| |
| /** The destructor calls finalize(). */ |
| ~SkDeflateWStream() override; |
| |
| /** Write the end of the compressed stream. All subsequent calls to |
| write() will fail. Subsequent calls to finalize() do nothing. */ |
| void finalize(); |
| |
| // The SkWStream interface: |
| bool write(const void*, size_t) override; |
| size_t bytesWritten() const override; |
| |
| private: |
| struct Impl; |
| std::unique_ptr<Impl> fImpl; |
| }; |
| |
| #endif // SkFlate_DEFINED |