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https://github.com/libretro/scummvm.git
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110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/scummsys.h"
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/* Common memory code used by the Indeo decoder
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*
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* Original copyright note: * Intel Indeo 4 (IV41, IV42, etc.) video decoder for ffmpeg
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* written, produced, and directed by Alan Smithee
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*/
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#ifndef IMAGE_CODECS_INDEO_MEM_H
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#define IMAGE_CODECS_INDEO_MEM_H
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namespace Image {
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namespace Indeo {
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#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
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#define FFALIGN(x, a) (((x) + (a)-1) & ~((a)-1))
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#define FFSIGN(a) ((a) > 0 ? 1 : -1)
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#define MAX_INTEGER 0x7ffffff
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/**
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* Free a memory block which has been allocated with a function of av_malloc()
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* or av_realloc() family, and set the pointer pointing to it to `NULL`.
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*
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* @param ptr Pointer to the pointer to the memory block which should be freed
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* @note `*ptr = NULL` is safe and leads to no action.
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*/
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extern void avFreeP(void *arg);
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/**
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* Allocate, reallocate, or free a block of memory.
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*
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* This function does the same thing as av_realloc(), except:
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* - It takes two size arguments and allocates `nelem * elsize` bytes,
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* after checking the result of the multiplication for integer overflow.
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* - It frees the input block in case of failure, thus avoiding the memory
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* leak with the classic
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* @code{.c}
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* buf = realloc(buf);
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* if (!buf)
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* return -1;
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* @endcode
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* pattern.
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*/
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extern void *avReallocF(void *ptr, size_t nelem, size_t elsize);
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/**
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* Reverse "nbits" bits of the value "val" and return the result
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* in the least significant bits.
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*/
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extern uint16 invertBits(uint16 val, int nbits);
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/**
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* Swap the order of the bytes in the passed value
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*/
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extern uint32 bitswap32(uint32 x);
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/**
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* Clip a signed integer value into the 0-255 range.
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* @param a value to clip
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* @return clipped value
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*/
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inline uint8 avClipUint8(int a) {
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if (a & (~0xFF))
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return (-a) >> 31;
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else
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return a;
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}
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/**
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* Clip a signed integer to an unsigned power of two range.
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* @param a value to clip
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* @param p bit position to clip at
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* @return clipped value
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*/
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inline unsigned avClipUintp2(int a, int p) {
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if (a & ~((1 << p) - 1))
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return -a >> 31 & ((1 << p) - 1);
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else
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return a;
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}
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extern const uint8 ffZigZagDirect[64];
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} // End of namespace Indeo
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} // End of namespace Image
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#endif
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