1 
2 /*
3  * Copyright 2008 The Android Open Source Project
4  *
5  * Use of this source code is governed by a BSD-style license that can be
6  * found in the LICENSE file.
7  */
8 
9 
10 #ifndef SkPackBits_DEFINED
11 #define SkPackBits_DEFINED
12 
13 #include "SkTypes.h"
14 
15 class SkPackBits {
16 public:
17     /** Given the number of 8bit values that will be passed to Pack8,
18         returns the worst-case size needed for the dst[] buffer.
19     */
20     static size_t ComputeMaxSize8(size_t srcSize);
21 
22     /** Write the src array into a packed format. The packing process may end
23         up writing more bytes than it read, so dst[] must be large enough.
24         @param src      Input array of 8bit values
25         @param srcSize  Number of entries in src[]
26         @param dst      Buffer (allocated by caller) to write the packed data
27                         into
28         @param dstSize  Number of bytes in the output buffer.
29         @return the number of bytes written to dst[]
30     */
31     static size_t Pack8(const uint8_t src[], size_t srcSize, uint8_t dst[],
32                         size_t dstSize);
33 
34     /** Unpack the data in src[], and expand it into dst[]. The src[] data was
35         written by a previous call to Pack8.
36         @param src      Input data to unpack, previously created by Pack8.
37         @param srcSize  Number of bytes of src to unpack
38         @param dst      Buffer (allocated by caller) to expand the src[] into.
39         @param dstSize  Number of bytes in the output buffer.
40         @return the number of bytes written into dst.
41     */
42     static int Unpack8(const uint8_t src[], size_t srcSize, uint8_t dst[],
43                        size_t dstSize);
44 };
45 
46 #endif
47