1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/core/SkPackBits.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,79 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2008 The Android Open Source Project
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +
1.13 +#ifndef SkPackBits_DEFINED
1.14 +#define SkPackBits_DEFINED
1.15 +
1.16 +#include "SkTypes.h"
1.17 +
1.18 +class SkPackBits {
1.19 +public:
1.20 + /** Given the number of 16bit values that will be passed to Pack16,
1.21 + returns the worst-case size needed for the dst[] buffer.
1.22 + */
1.23 + static size_t ComputeMaxSize16(int count);
1.24 +
1.25 + /** Given the number of 8bit values that will be passed to Pack8,
1.26 + returns the worst-case size needed for the dst[] buffer.
1.27 + */
1.28 + static size_t ComputeMaxSize8(int count);
1.29 +
1.30 + /** Write the src array into a packed format. The packing process may end
1.31 + up writing more bytes than it read, so dst[] must be large enough.
1.32 + @param src Input array of 16bit values
1.33 + @param count Number of entries in src[]
1.34 + @param dst Buffer (allocated by caller) to write the packed data
1.35 + into
1.36 + @return the number of bytes written to dst[]
1.37 + */
1.38 + static size_t Pack16(const uint16_t src[], int count, uint8_t dst[]);
1.39 +
1.40 + /** Write the src array into a packed format. The packing process may end
1.41 + up writing more bytes than it read, so dst[] must be large enough.
1.42 + @param src Input array of 8bit values
1.43 + @param count Number of entries in src[]
1.44 + @param dst Buffer (allocated by caller) to write the packed data
1.45 + into
1.46 + @return the number of bytes written to dst[]
1.47 + */
1.48 + static size_t Pack8(const uint8_t src[], int count, uint8_t dst[]);
1.49 +
1.50 + /** Unpack the data in src[], and expand it into dst[]. The src[] data was
1.51 + written by a previous call to Pack16.
1.52 + @param src Input data to unpack, previously created by Pack16.
1.53 + @param srcSize Number of bytes of src to unpack
1.54 + @param dst Buffer (allocated by caller) to expand the src[] into.
1.55 + @return the number of dst elements (not bytes) written into dst.
1.56 + */
1.57 + static int Unpack16(const uint8_t src[], size_t srcSize, uint16_t dst[]);
1.58 +
1.59 + /** Unpack the data in src[], and expand it into dst[]. The src[] data was
1.60 + written by a previous call to Pack8.
1.61 + @param src Input data to unpack, previously created by Pack8.
1.62 + @param srcSize Number of bytes of src to unpack
1.63 + @param dst Buffer (allocated by caller) to expand the src[] into.
1.64 + @return the number of bytes written into dst.
1.65 + */
1.66 + static int Unpack8(const uint8_t src[], size_t srcSize, uint8_t dst[]);
1.67 +
1.68 + /** Unpack the data from src[], skip the first dstSkip bytes, then write
1.69 + dstWrite bytes into dst[]. The src[] data was written by a previous
1.70 + call to Pack8. Return the number of bytes actually writtten into dst[]
1.71 + @param src Input data to unpack, previously created by Pack8.
1.72 + @param dst Buffer (allocated by caller) to expand the src[] into.
1.73 + @param dstSkip Number of bytes of unpacked src to skip before writing
1.74 + into dst
1.75 + @param dstWrite Number of bytes of unpacked src to write into dst (after
1.76 + skipping dstSkip bytes)
1.77 + */
1.78 + static void Unpack8(uint8_t dst[], size_t dstSkip, size_t dstWrite,
1.79 + const uint8_t src[]);
1.80 +};
1.81 +
1.82 +#endif
