/*
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* Copyright 2008 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkPackBits_DEFINED
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#define SkPackBits_DEFINED
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#include "SkTypes.h"
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class SkPackBits {
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public:
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/** Given the number of 8bit values that will be passed to Pack8,
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returns the worst-case size needed for the dst[] buffer.
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*/
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static size_t ComputeMaxSize8(size_t srcSize);
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/** Write the src array into a packed format. The packing process may end
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up writing more bytes than it read, so dst[] must be large enough.
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@param src Input array of 8bit values
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@param srcSize Number of entries in src[]
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@param dst Buffer (allocated by caller) to write the packed data
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into
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@param dstSize Number of bytes in the output buffer.
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@return the number of bytes written to dst[]
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*/
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static size_t Pack8(const uint8_t src[], size_t srcSize, uint8_t dst[],
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size_t dstSize);
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/** Unpack the data in src[], and expand it into dst[]. The src[] data was
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written by a previous call to Pack8.
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@param src Input data to unpack, previously created by Pack8.
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@param srcSize Number of bytes of src to unpack
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@param dst Buffer (allocated by caller) to expand the src[] into.
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@param dstSize Number of bytes in the output buffer.
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@return the number of bytes written into dst, or 0 if srcSize or dstSize are too small.
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*/
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static int Unpack8(const uint8_t src[], size_t srcSize, uint8_t dst[],
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size_t dstSize);
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};
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#endif
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