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
