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 "SkTypes.h" 13 14 class SkPackBits { 15 public: 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
