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Diffstat (limited to 'image/codecs/indeo/mem.cpp')
| -rw-r--r-- | image/codecs/indeo/mem.cpp | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/image/codecs/indeo/mem.cpp b/image/codecs/indeo/mem.cpp new file mode 100644 index 0000000000..9db37ec601 --- /dev/null +++ b/image/codecs/indeo/mem.cpp @@ -0,0 +1,172 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +/* VLC code + * + * Original copyright note: * Intel Indeo 4 (IV41, IV42, etc.) video decoder for ffmpeg + * written, produced, and directed by Alan Smithee + */ + +#include "image/codecs/indeo/mem.h" + +namespace Image { +namespace Indeo { + +const uint8 ffReverse[256] = { + 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, + 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, + 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, + 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, + 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, + 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, + 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, + 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, + 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, + 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, + 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, + 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, + 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, + 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, + 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, + 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF, +}; + +const uint8 ffZigZagDirect[64] = { + 0, 1, 8, 16, 9, 2, 3, 10, + 17, 24, 32, 25, 18, 11, 4, 5, + 12, 19, 26, 33, 40, 48, 41, 34, + 27, 20, 13, 6, 7, 14, 21, 28, + 35, 42, 49, 56, 57, 50, 43, 36, + 29, 22, 15, 23, 30, 37, 44, 51, + 58, 59, 52, 45, 38, 31, 39, 46, + 53, 60, 61, 54, 47, 55, 62, 63 +}; + +/*------------------------------------------------------------------------*/ + +/** + * Multiply two `size_t` values checking for overflow. + * + * @param[in] a,b Operands of multiplication + * @param[out] r Pointer to the result of the operation + * @return 0 on success, AVERROR(EINVAL) on overflow + */ +static inline int avSizeMult(size_t a, size_t b, size_t *r) { + size_t t = a * b; + + // Hack inspired from glibc: don't try the division if nelem and elsize + // are both less than sqrt(SIZE_MAX). + if ((a | b) >= ((size_t)1 << (sizeof(size_t) * 4)) && a && t / a != b) + return -1; + *r = t; + return 0; +} + +/*------------------------------------------------------------------------*/ + +void *avMallocZ(size_t size) { + void *ptr = malloc(size); + if (ptr) + memset(ptr, 0, size); + + return ptr; +} + +void *avMallocArray(size_t nmemb, size_t size) { + assert(size && nmemb < MAX_INTEGER / size); + return malloc(nmemb * size); +} + +void *avMallocZArray(size_t nmemb, size_t size) { + assert(size && nmemb < MAX_INTEGER / size); + return avMallocZ(nmemb * size); +} + +void avFreeP(void *arg) { + void **ptr = (void **)arg; + free(*ptr); + *ptr = nullptr; +} + +static void *avRealloc(void *ptr, size_t size) { + return realloc(ptr, size + !size); +} + +void *avReallocF(void *ptr, size_t nelem, size_t elsize) { + size_t size; + void *r; + + if (avSizeMult(elsize, nelem, &size)) { + free(ptr); + return nullptr; + } + r = avRealloc(ptr, size); + if (!r) + free(ptr); + + return r; +} + + +/** + * Swap the order of the bytes in the passed value + */ +uint32 bitswap32(uint32 x) { + return (uint32)ffReverse[x & 0xFF] << 24 | + (uint32)ffReverse[(x >> 8) & 0xFF] << 16 | + (uint32)ffReverse[(x >> 16) & 0xFF] << 8 | + (uint32)ffReverse[x >> 24]; +} + +/** + * Reverse "nbits" bits of the value "val" and return the result + * in the least significant bits. + */ +uint16 invertBits(uint16 val, int nbits) { + uint16 res; + + if (nbits <= 8) { + res = ffReverse[val] >> (8 - nbits); + } else { + res = ((ffReverse[val & 0xFF] << 8) + + (ffReverse[val >> 8])) >> (16 - nbits); + } + + return res; +} + +uint8 avClipUint8(int a) { + if (a & (~0xFF)) + return (-a) >> 31; + else + return a; +} + +unsigned avClipUintp2(int a, int p) { + if (a & ~((1 << p) - 1)) + return -a >> 31 & ((1 << p) - 1); + else + return a; +} + +} // End of namespace Indeo +} // End of namespace Image |