11cab2921ab279367f8206cdadc9259d12e603548Derek Sollenberger 20910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project/* 31cab2921ab279367f8206cdadc9259d12e603548Derek Sollenberger * Copyright 2008 The Android Open Source Project 40910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project * 51cab2921ab279367f8206cdadc9259d12e603548Derek Sollenberger * Use of this source code is governed by a BSD-style license that can be 61cab2921ab279367f8206cdadc9259d12e603548Derek Sollenberger * found in the LICENSE file. 70910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 80910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 91cab2921ab279367f8206cdadc9259d12e603548Derek Sollenberger 100910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project#ifndef SkPackBits_DEFINED 110910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project#define SkPackBits_DEFINED 120910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 130910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project#include "SkTypes.h" 140910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 150910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Projectclass SkPackBits { 160910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Projectpublic: 170910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project /** Given the number of 16bit values that will be passed to Pack16, 180910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project returns the worst-case size needed for the dst[] buffer. 190910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 200910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project static size_t ComputeMaxSize16(int count); 210910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 220910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project /** Given the number of 8bit values that will be passed to Pack8, 230910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project returns the worst-case size needed for the dst[] buffer. 240910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 250910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project static size_t ComputeMaxSize8(int count); 260910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 270910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project /** Write the src array into a packed format. The packing process may end 280910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project up writing more bytes than it read, so dst[] must be large enough. 290910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param src Input array of 16bit values 300910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param count Number of entries in src[] 310910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param dst Buffer (allocated by caller) to write the packed data 320910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project into 330910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @return the number of bytes written to dst[] 340910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 350910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project static size_t Pack16(const uint16_t src[], int count, uint8_t dst[]); 360910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 370910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project /** Write the src array into a packed format. The packing process may end 380910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project up writing more bytes than it read, so dst[] must be large enough. 390910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param src Input array of 8bit values 400910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param count Number of entries in src[] 410910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param dst Buffer (allocated by caller) to write the packed data 420910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project into 430910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @return the number of bytes written to dst[] 440910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 450910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project static size_t Pack8(const uint8_t src[], int count, uint8_t dst[]); 460910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 470910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project /** Unpack the data in src[], and expand it into dst[]. The src[] data was 480910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project written by a previous call to Pack16. 490910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param src Input data to unpack, previously created by Pack16. 500910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param srcSize Number of bytes of src to unpack 510910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param dst Buffer (allocated by caller) to expand the src[] into. 520910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @return the number of dst elements (not bytes) written into dst. 530910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 540910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project static int Unpack16(const uint8_t src[], size_t srcSize, uint16_t dst[]); 550910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 560910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project /** Unpack the data in src[], and expand it into dst[]. The src[] data was 570910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project written by a previous call to Pack8. 580910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param src Input data to unpack, previously created by Pack8. 590910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param srcSize Number of bytes of src to unpack 600910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param dst Buffer (allocated by caller) to expand the src[] into. 610910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @return the number of bytes written into dst. 620910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 630910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project static int Unpack8(const uint8_t src[], size_t srcSize, uint8_t dst[]); 640910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 650910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project /** Unpack the data from src[], skip the first dstSkip bytes, then write 660910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project dstWrite bytes into dst[]. The src[] data was written by a previous 670910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project call to Pack8. Return the number of bytes actually writtten into dst[] 680910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param src Input data to unpack, previously created by Pack8. 690910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param dst Buffer (allocated by caller) to expand the src[] into. 700910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param dstSkip Number of bytes of unpacked src to skip before writing 710910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project into dst 720910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project @param dstWrite Number of bytes of unpacked src to write into dst (after 730910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project skipping dstSkip bytes) 740910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project */ 750910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project static void Unpack8(uint8_t dst[], size_t dstSkip, size_t dstWrite, 760910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project const uint8_t src[]); 770910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project}; 780910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project 790910916c0f7b951ee55c4b7c6358295b9bca0565The Android Open Source Project#endif 80