/indra/llmessage/patch_dct.h
https://bitbucket.org/lindenlab/viewer-beta/ · C++ Header · 91 lines · 35 code · 13 blank · 43 comment · 0 complexity · a9ef2e756866807166af9c19900ec276 MD5 · raw file
- /**
- * @file patch_dct.h
- * @brief Function declarations for DCT and IDCT routines
- *
- * $LicenseInfo:firstyear=2000&license=viewerlgpl$
- * Second Life Viewer Source Code
- * Copyright (C) 2010, Linden Research, Inc.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation;
- * version 2.1 of the License only.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
- * $/LicenseInfo$
- */
- #ifndef LL_PATCH_DCT_H
- #define LL_PATCH_DCT_H
- class LLVector3;
- // Code Values
- const U8 ZERO_CODE = 0x0;
- const U8 ZERO_EOB = 0x2;
- const U8 POSITIVE_VALUE = 0x6;
- const U8 NEGATIVE_VALUE = 0x7;
- const S8 NORMAL_PATCH_SIZE = 16;
- const S8 LARGE_PATCH_SIZE = 32;
- const U8 END_OF_PATCHES = 97;
- #define _PATCH_SIZE_16_AND_32_ONLY
- // Top level header for group of headers
- //typedef struct LL_Group_Header
- //{
- // U16 stride; // 2 = 2
- // U8 patch_size; // 1 = 3
- // U8 layer_type; // 1 = 4
- //} LLGroupHeader;
- class LLGroupHeader
- {
- public:
- U16 stride; // 2 = 2
- U8 patch_size; // 1 = 3
- U8 layer_type; // 1 = 4
- };
- // Individual patch header
- //typedef struct LL_Patch_Header
- //{
- // F32 dc_offset; // 4 bytes
- // U16 range; // 2 = 7 ((S16) FP range (breaks if we need > 32K meters in 1 patch)
- // U8 quant_wbits; // 1 = 8 (upper 4 bits is quant - 2, lower 4 bits is word bits - 2)
- // U16 patchids; // 2 = 10 (actually only uses 10 bits, 5 for each)
- //} LLPatchHeader;
- class LLPatchHeader
- {
- public:
- F32 dc_offset; // 4 bytes
- U16 range; // 2 = 7 ((S16) FP range (breaks if we need > 32K meters in 1 patch)
- U8 quant_wbits; // 1 = 8 (upper 4 bits is quant - 2, lower 4 bits is word bits - 2)
- U16 patchids; // 2 = 10 (actually only uses 10 bits, 5 for each)
- };
- // Compression routines
- void init_patch_compressor(S32 patch_size, S32 patch_stride, S32 layer_type);
- void prescan_patch(F32 *patch, LLPatchHeader *php, F32 &zmax, F32 &zmin);
- void compress_patch(F32 *patch, S32 *cpatch, LLPatchHeader *php, S32 prequant);
- void get_patch_group_header(LLGroupHeader *gopp);
- // Decompression routines
- void set_group_of_patch_header(LLGroupHeader *gopp);
- void init_patch_decompressor(S32 size);
- void decompress_patch(F32 *patch, S32 *cpatch, LLPatchHeader *ph);
- void decompress_patchv(LLVector3 *v, S32 *cpatch, LLPatchHeader *ph);
- #endif