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comparison: gfx/skia/trunk/include/core/SkPackBits.h
gfx/skia/trunk/include/core/SkPackBits.h
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:1871616163cd |
|---|---|
| 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 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 |
