1/*
2 * Copyright 2008 The Android Open Source Project
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
8
9#ifndef SkPackBits_DEFINED
10#define SkPackBits_DEFINED
11
12#include "include/core/SkTypes.h"
13
14class SkPackBits {
15public:
16 /** Given the number of 8bit values that will be passed to Pack8,
17 returns the worst-case size needed for the dst[] buffer.
18 */
19 static size_t ComputeMaxSize8(size_t srcSize);
20
21 /** Write the src array into a packed format. The packing process may end
22 up writing more bytes than it read, so dst[] must be large enough.
23 @param src Input array of 8bit values
24 @param srcSize Number of entries in src[]
25 @param dst Buffer (allocated by caller) to write the packed data
26 into
27 @param dstSize Number of bytes in the output buffer.
28 @return the number of bytes written to dst[]
29 */
30 static size_t Pack8(const uint8_t src[], size_t srcSize, uint8_t dst[],
31 size_t dstSize);
32
33 /** Unpack the data in src[], and expand it into dst[]. The src[] data was
34 written by a previous call to Pack8.
35 @param src Input data to unpack, previously created by Pack8.
36 @param srcSize Number of bytes of src to unpack
37 @param dst Buffer (allocated by caller) to expand the src[] into.
38 @param dstSize Number of bytes in the output buffer.
39 @return the number of bytes written into dst, or 0 if srcSize or dstSize are too small.
40 */
41 static int Unpack8(const uint8_t src[], size_t srcSize, uint8_t dst[],
42 size_t dstSize);
43};
44
45#endif
46