epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2 | /* |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 3 | * Copyright 2008 The Android Open Source Project |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 4 | * |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 7 | */ |
| 8 | |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 9 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 10 | #ifndef SkPackBits_DEFINED |
| 11 | #define SkPackBits_DEFINED |
| 12 | |
| 13 | #include "SkTypes.h" |
| 14 | |
| 15 | class SkPackBits { |
| 16 | public: |
| 17 | /** Given the number of 16bit values that will be passed to Pack16, |
| 18 | returns the worst-case size needed for the dst[] buffer. |
| 19 | */ |
| 20 | static size_t ComputeMaxSize16(int count); |
| 21 | |
| 22 | /** Given the number of 8bit values that will be passed to Pack8, |
| 23 | returns the worst-case size needed for the dst[] buffer. |
| 24 | */ |
| 25 | static size_t ComputeMaxSize8(int count); |
| 26 | |
| 27 | /** Write the src array into a packed format. The packing process may end |
| 28 | up writing more bytes than it read, so dst[] must be large enough. |
| 29 | @param src Input array of 16bit values |
| 30 | @param count Number of entries in src[] |
| 31 | @param dst Buffer (allocated by caller) to write the packed data |
| 32 | into |
| 33 | @return the number of bytes written to dst[] |
| 34 | */ |
| 35 | static size_t Pack16(const uint16_t src[], int count, uint8_t dst[]); |
| 36 | |
| 37 | /** Write the src array into a packed format. The packing process may end |
| 38 | up writing more bytes than it read, so dst[] must be large enough. |
| 39 | @param src Input array of 8bit values |
| 40 | @param count Number of entries in src[] |
| 41 | @param dst Buffer (allocated by caller) to write the packed data |
| 42 | into |
| 43 | @return the number of bytes written to dst[] |
| 44 | */ |
| 45 | static size_t Pack8(const uint8_t src[], int count, uint8_t dst[]); |
| 46 | |
| 47 | /** Unpack the data in src[], and expand it into dst[]. The src[] data was |
| 48 | written by a previous call to Pack16. |
| 49 | @param src Input data to unpack, previously created by Pack16. |
| 50 | @param srcSize Number of bytes of src to unpack |
| 51 | @param dst Buffer (allocated by caller) to expand the src[] into. |
| 52 | @return the number of dst elements (not bytes) written into dst. |
| 53 | */ |
| 54 | static int Unpack16(const uint8_t src[], size_t srcSize, uint16_t dst[]); |
| 55 | |
| 56 | /** Unpack the data in src[], and expand it into dst[]. The src[] data was |
| 57 | written by a previous call to Pack8. |
| 58 | @param src Input data to unpack, previously created by Pack8. |
| 59 | @param srcSize Number of bytes of src to unpack |
| 60 | @param dst Buffer (allocated by caller) to expand the src[] into. |
| 61 | @return the number of bytes written into dst. |
| 62 | */ |
| 63 | static int Unpack8(const uint8_t src[], size_t srcSize, uint8_t dst[]); |
| 64 | |
| 65 | /** Unpack the data from src[], skip the first dstSkip bytes, then write |
| 66 | dstWrite bytes into dst[]. The src[] data was written by a previous |
| 67 | call to Pack8. Return the number of bytes actually writtten into dst[] |
| 68 | @param src Input data to unpack, previously created by Pack8. |
| 69 | @param dst Buffer (allocated by caller) to expand the src[] into. |
| 70 | @param dstSkip Number of bytes of unpacked src to skip before writing |
| 71 | into dst |
| 72 | @param dstWrite Number of bytes of unpacked src to write into dst (after |
| 73 | skipping dstSkip bytes) |
| 74 | */ |
| 75 | static void Unpack8(uint8_t dst[], size_t dstSkip, size_t dstWrite, |
| 76 | const uint8_t src[]); |
| 77 | }; |
| 78 | |
| 79 | #endif |