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100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
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/*
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Copyright 2007 nVidia, Inc.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
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You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and limitations under the License.
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*/
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#ifndef _AVPCL_H
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#define _AVPCL_H
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#include "tile.h"
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#include "bits.h"
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#define DISABLE_EXHAUSTIVE 1 // define this if you don't want to spend a lot of time on exhaustive compression
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#define USE_ZOH_INTERP 1 // use zoh interpolator, otherwise use exact avpcl interpolators
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#define USE_ZOH_INTERP_ROUNDED 1 // use the rounded versions!
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namespace AVPCL {
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static const int NREGIONS_TWO = 2;
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static const int NREGIONS_THREE = 3;
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static const int BLOCKSIZE=16;
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static const int BITSIZE=128;
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// global flags
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extern bool flag_premult;
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extern bool flag_nonuniform;
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extern bool flag_nonuniform_ati;
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// global mode
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extern bool mode_rgb; // true if image had constant alpha = 255
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void compress(const Tile &t, char *block);
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void decompress(const char *block, Tile &t);
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float compress_mode0(const Tile &t, char *block);
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void decompress_mode0(const char *block, Tile &t);
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float compress_mode1(const Tile &t, char *block);
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void decompress_mode1(const char *block, Tile &t);
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float compress_mode2(const Tile &t, char *block);
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void decompress_mode2(const char *block, Tile &t);
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float compress_mode3(const Tile &t, char *block);
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void decompress_mode3(const char *block, Tile &t);
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float compress_mode4(const Tile &t, char *block);
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void decompress_mode4(const char *block, Tile &t);
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float compress_mode5(const Tile &t, char *block);
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void decompress_mode5(const char *block, Tile &t);
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float compress_mode6(const Tile &t, char *block);
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void decompress_mode6(const char *block, Tile &t);
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float compress_mode7(const Tile &t, char *block);
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void decompress_mode7(const char *block, Tile &t);
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inline int getmode(Bits &in)
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{
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int mode = 0;
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if (in.read(1)) mode = 0;
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else if (in.read(1)) mode = 1;
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else if (in.read(1)) mode = 2;
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else if (in.read(1)) mode = 3;
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else if (in.read(1)) mode = 4;
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else if (in.read(1)) mode = 5;
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else if (in.read(1)) mode = 6;
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else if (in.read(1)) mode = 7;
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else mode = 8; // reserved
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return mode;
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}
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inline int getmode(const char *block)
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{
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int bits = block[0], mode = 0;
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if (bits & 1) mode = 0;
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else if ((bits&3) == 2) mode = 1;
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else if ((bits&7) == 4) mode = 2;
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else if ((bits & 0xF) == 8) mode = 3;
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else if ((bits & 0x1F) == 16) mode = 4;
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else if ((bits & 0x3F) == 32) mode = 5;
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else if ((bits & 0x7F) == 64) mode = 6;
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else if ((bits & 0xFF) == 128) mode = 7;
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else mode = 8; // reserved
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return mode;
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}
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}
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#endif
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