1997-11-25 06:05:25 +08:00
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/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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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 2 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, write to the Free Software
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1998-04-13 13:44:11 +08:00
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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1997-11-25 06:05:25 +08:00
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*/
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2001-05-16 00:42:08 +08:00
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#ifndef __GIMP_IMAGE_CONVERT_FSDITHER_H__
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#define __GIMP_IMAGE_CONVERT_FSDITHER_H__
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1997-11-25 06:05:25 +08:00
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/* The following 5 arrays are used in performing floyd-steinberg
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* error diffusion dithering. The range array allows the quick
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* bounds checking of pixel values. The 4 error arrays contain
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2005-02-27 22:03:50 +08:00
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* the error computations for the east, south-east, south and
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1997-11-25 06:05:25 +08:00
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* south-west pixels surrounding the current pixel respectively.
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*/
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1999-09-02 04:41:10 +08:00
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2005-02-27 22:03:50 +08:00
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static const guchar range_array[] = {
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1997-11-25 06:05:25 +08:00
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 1, 2, 3,
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4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
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14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
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34, 35, 36, 37, 38, 39, 40, 41, 42, 43,
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44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
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54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
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64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
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74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
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84, 85, 86, 87, 88, 89, 90, 91, 92, 93,
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94, 95, 96, 97, 98, 99, 100, 101, 102, 103,
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104, 105, 106, 107, 108, 109, 110, 111, 112, 113,
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114, 115, 116, 117, 118, 119, 120, 121, 122, 123,
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124, 125, 126, 127, 128, 129, 130, 131, 132, 133,
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134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
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144, 145, 146, 147, 148, 149, 150, 151, 152, 153,
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154, 155, 156, 157, 158, 159, 160, 161, 162, 163,
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164, 165, 166, 167, 168, 169, 170, 171, 172, 173,
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174, 175, 176, 177, 178, 179, 180, 181, 182, 183,
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184, 185, 186, 187, 188, 189, 190, 191, 192, 193,
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194, 195, 196, 197, 198, 199, 200, 201, 202, 203,
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204, 205, 206, 207, 208, 209, 210, 211, 212, 213,
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214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
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224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
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234, 235, 236, 237, 238, 239, 240, 241, 242, 243,
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244, 245, 246, 247, 248, 249, 250, 251, 252, 253,
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254, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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255, 255, 255, 255, 255,
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};
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2005-02-27 22:03:50 +08:00
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static const gshort floyd_steinberg_error1[] = {
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1997-11-25 06:05:25 +08:00
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-223, -223, -222, -222, -221, -221, -220, -220, -220, -219,
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-219, -218, -218, -217, -217, -217, -216, -216, -215, -215,
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-214, -214, -213, -213, -213, -212, -212, -211, -211, -210,
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-210, -210, -209, -209, -208, -208, -207, -207, -206, -206,
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-206, -205, -205, -204, -204, -203, -203, -203, -202, -202,
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-201, -201, -200, -200, -199, -199, -199, -198, -198, -197,
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-197, -196, -196, -196, -195, -195, -194, -194, -193, -193,
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-192, -192, -192, -191, -191, -190, -190, -189, -189, -189,
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-188, -188, -187, -187, -186, -186, -185, -185, -185, -184,
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-184, -183, -183, -182, -182, -182, -181, -181, -180, -180,
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-179, -179, -178, -178, -178, -177, -177, -176, -176, -175,
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-175, -175, -174, -174, -173, -173, -172, -172, -171, -171,
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-171, -170, -170, -169, -169, -168, -168, -168, -167, -167,
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-166, -166, -165, -165, -164, -164, -164, -163, -163, -162,
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-162, -161, -161, -161, -160, -160, -159, -159, -158, -158,
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-157, -157, -157, -156, -156, -155, -155, -154, -154, -154,
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-153, -153, -152, -152, -151, -151, -150, -150, -150, -149,
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-149, -148, -148, -147, -147, -147, -146, -146, -145, -145,
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-144, -144, -143, -143, -143, -142, -142, -141, -141, -140,
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-140, -140, -139, -139, -138, -138, -137, -137, -136, -136,
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-136, -135, -135, -134, -134, -133, -133, -133, -132, -132,
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-131, -131, -130, -130, -129, -129, -129, -128, -128, -127,
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-127, -126, -126, -126, -125, -125, -124, -124, -123, -123,
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-122, -122, -122, -121, -121, -120, -120, -119, -119, -119,
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-118, -118, -117, -117, -116, -116, -115, -115, -115, -114,
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-114, -113, -113, -112, -112, -112, -111, -111, -110, -110,
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-109, -109, -108, -108, -108, -107, -107, -106, -106, -105,
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-105, -105, -104, -104, -103, -103, -102, -102, -101, -101,
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-101, -100, -100, -99, -99, -98, -98, -98, -97, -97,
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-96, -96, -95, -95, -94, -94, -94, -93, -93, -92,
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-92, -91, -91, -91, -90, -90, -89, -89, -88, -88,
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-87, -87, -87, -86, -86, -85, -85, -84, -84, -84,
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-83, -83, -82, -82, -81, -81, -80, -80, -80, -79,
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-79, -78, -78, -77, -77, -77, -76, -76, -75, -75,
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-74, -74, -73, -73, -73, -72, -72, -71, -71, -70,
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-70, -70, -69, -69, -68, -68, -67, -67, -66, -66,
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-66, -65, -65, -64, -64, -63, -63, -63, -62, -62,
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-61, -61, -60, -60, -59, -59, -59, -58, -58, -57,
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-57, -56, -56, -56, -55, -55, -54, -54, -53, -53,
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-52, -52, -52, -51, -51, -50, -50, -49, -49, -49,
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-48, -48, -47, -47, -46, -46, -45, -45, -45, -44,
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-44, -43, -43, -42, -42, -42, -41, -41, -40, -40,
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-39, -39, -38, -38, -38, -37, -37, -36, -36, -35,
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-35, -35, -34, -34, -33, -33, -32, -32, -31, -31,
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-31, -30, -30, -29, -29, -28, -28, -28, -27, -27,
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-26, -26, -25, -25, -24, -24, -24, -23, -23, -22,
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-22, -21, -21, -21, -20, -20, -19, -19, -18, -18,
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-17, -17, -17, -16, -16, -15, -15, -14, -14, -14,
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-13, -13, -12, -12, -11, -11, -10, -10, -10, -9,
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-9, -8, -8, -7, -7, -7, -6, -6, -5, -5,
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-4, -4, -3, -3, -3, -2, -2, -1, -1, 0,
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0, 0, 0, 0, 1, 1, 2, 2, 3, 3,
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3, 4, 4, 5, 5, 6, 6, 7, 7, 7,
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8, 8, 9, 9, 10, 10, 10, 11, 11, 12,
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12, 13, 13, 14, 14, 14, 15, 15, 16, 16,
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17, 17, 17, 18, 18, 19, 19, 20, 20, 21,
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21, 21, 22, 22, 23, 23, 24, 24, 24, 25,
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25, 26, 26, 27, 27, 28, 28, 28, 29, 29,
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30, 30, 31, 31, 31, 32, 32, 33, 33, 34,
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34, 35, 35, 35, 36, 36, 37, 37, 38, 38,
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38, 39, 39, 40, 40, 41, 41, 42, 42, 42,
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43, 43, 44, 44, 45, 45, 45, 46, 46, 47,
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47, 48, 48, 49, 49, 49, 50, 50, 51, 51,
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52, 52, 52, 53, 53, 54, 54, 55, 55, 56,
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56, 56, 57, 57, 58, 58, 59, 59, 59, 60,
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60, 61, 61, 62, 62, 63, 63, 63, 64, 64,
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65, 65, 66, 66, 66, 67, 67, 68, 68, 69,
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69, 70, 70, 70, 71, 71, 72, 72, 73, 73,
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73, 74, 74, 75, 75, 76, 76, 77, 77, 77,
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78, 78, 79, 79, 80, 80, 80, 81, 81, 82,
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82, 83, 83, 84, 84, 84, 85, 85, 86, 86,
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87, 87, 87, 88, 88, 89, 89, 90, 90, 91,
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91, 91, 92, 92, 93, 93, 94, 94, 94, 95,
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95, 96, 96, 97, 97, 98, 98, 98, 99, 99,
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100, 100, 101, 101, 101, 102, 102, 103, 103, 104,
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104, 105, 105, 105, 106, 106, 107, 107, 108, 108,
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108, 109, 109, 110, 110, 111, 111, 112, 112, 112,
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|
|
113, 113, 114, 114, 115, 115, 115, 116, 116, 117,
|
|
|
|
|
117, 118, 118, 119, 119, 119, 120, 120, 121, 121,
|
|
|
|
|
122, 122, 122, 123, 123, 124, 124, 125, 125, 126,
|
|
|
|
|
126, 126, 127, 127, 128, 128, 129, 129, 129, 130,
|
|
|
|
|
130, 131, 131, 132, 132, 133, 133, 133, 134, 134,
|
|
|
|
|
135, 135, 136, 136, 136, 137, 137, 138, 138, 139,
|
|
|
|
|
139, 140, 140, 140, 141, 141, 142, 142, 143, 143,
|
|
|
|
|
143, 144, 144, 145, 145, 146, 146, 147, 147, 147,
|
|
|
|
|
148, 148, 149, 149, 150, 150, 150, 151, 151, 152,
|
|
|
|
|
152, 153, 153, 154, 154, 154, 155, 155, 156, 156,
|
|
|
|
|
157, 157, 157, 158, 158, 159, 159, 160, 160, 161,
|
|
|
|
|
161, 161, 162, 162, 163, 163, 164, 164, 164, 165,
|
|
|
|
|
165, 166, 166, 167, 167, 168, 168, 168, 169, 169,
|
|
|
|
|
170, 170, 171, 171, 171, 172, 172, 173, 173, 174,
|
|
|
|
|
174, 175, 175, 175, 176, 176, 177, 177, 178, 178,
|
|
|
|
|
178, 179, 179, 180, 180, 181, 181, 182, 182, 182,
|
|
|
|
|
183, 183, 184, 184, 185, 185, 185, 186, 186, 187,
|
|
|
|
|
187, 188, 188, 189, 189, 189, 190, 190, 191, 191,
|
|
|
|
|
192, 192, 192, 193, 193, 194, 194, 195, 195, 196,
|
|
|
|
|
196, 196, 197, 197, 198, 198, 199, 199, 199, 200,
|
|
|
|
|
200, 201, 201, 202, 202, 203, 203, 203, 204, 204,
|
|
|
|
|
205, 205, 206, 206, 206, 207, 207, 208, 208, 209,
|
|
|
|
|
209, 210, 210, 210, 211, 211, 212, 212, 213, 213,
|
|
|
|
|
213, 214, 214, 215, 215, 216, 216, 217, 217, 217,
|
|
|
|
|
218, 218, 219, 219, 220, 220, 220, 221, 221, 222,
|
|
|
|
|
222, 223, 223, 224, 224,
|
|
|
|
|
};
|
|
|
|
|
|
2005-02-27 22:03:50 +08:00
|
|
|
static const gshort floyd_steinberg_error2[] = {
|
1997-11-25 06:05:25 +08:00
|
|
|
-95, -95, -95, -95, -95, -94, -94, -94, -94, -94,
|
|
|
|
|
-93, -93, -93, -93, -93, -93, -92, -92, -92, -92,
|
|
|
|
|
-92, -91, -91, -91, -91, -91, -90, -90, -90, -90,
|
|
|
|
|
-90, -90, -89, -89, -89, -89, -89, -88, -88, -88,
|
|
|
|
|
-88, -88, -87, -87, -87, -87, -87, -87, -86, -86,
|
|
|
|
|
-86, -86, -86, -85, -85, -85, -85, -85, -84, -84,
|
|
|
|
|
-84, -84, -84, -84, -83, -83, -83, -83, -83, -82,
|
|
|
|
|
-82, -82, -82, -82, -81, -81, -81, -81, -81, -81,
|
|
|
|
|
-80, -80, -80, -80, -80, -79, -79, -79, -79, -79,
|
|
|
|
|
-78, -78, -78, -78, -78, -78, -77, -77, -77, -77,
|
|
|
|
|
-77, -76, -76, -76, -76, -76, -75, -75, -75, -75,
|
|
|
|
|
-75, -75, -74, -74, -74, -74, -74, -73, -73, -73,
|
|
|
|
|
-73, -73, -72, -72, -72, -72, -72, -72, -71, -71,
|
|
|
|
|
-71, -71, -71, -70, -70, -70, -70, -70, -69, -69,
|
|
|
|
|
-69, -69, -69, -69, -68, -68, -68, -68, -68, -67,
|
|
|
|
|
-67, -67, -67, -67, -66, -66, -66, -66, -66, -66,
|
|
|
|
|
-65, -65, -65, -65, -65, -64, -64, -64, -64, -64,
|
|
|
|
|
-63, -63, -63, -63, -63, -63, -62, -62, -62, -62,
|
|
|
|
|
-62, -61, -61, -61, -61, -61, -60, -60, -60, -60,
|
|
|
|
|
-60, -60, -59, -59, -59, -59, -59, -58, -58, -58,
|
|
|
|
|
-58, -58, -57, -57, -57, -57, -57, -57, -56, -56,
|
|
|
|
|
-56, -56, -56, -55, -55, -55, -55, -55, -54, -54,
|
|
|
|
|
-54, -54, -54, -54, -53, -53, -53, -53, -53, -52,
|
|
|
|
|
-52, -52, -52, -52, -51, -51, -51, -51, -51, -51,
|
|
|
|
|
-50, -50, -50, -50, -50, -49, -49, -49, -49, -49,
|
|
|
|
|
-48, -48, -48, -48, -48, -48, -47, -47, -47, -47,
|
|
|
|
|
-47, -46, -46, -46, -46, -46, -45, -45, -45, -45,
|
|
|
|
|
-45, -45, -44, -44, -44, -44, -44, -43, -43, -43,
|
|
|
|
|
-43, -43, -42, -42, -42, -42, -42, -42, -41, -41,
|
|
|
|
|
-41, -41, -41, -40, -40, -40, -40, -40, -39, -39,
|
|
|
|
|
-39, -39, -39, -39, -38, -38, -38, -38, -38, -37,
|
|
|
|
|
-37, -37, -37, -37, -36, -36, -36, -36, -36, -36,
|
|
|
|
|
-35, -35, -35, -35, -35, -34, -34, -34, -34, -34,
|
|
|
|
|
-33, -33, -33, -33, -33, -33, -32, -32, -32, -32,
|
|
|
|
|
-32, -31, -31, -31, -31, -31, -30, -30, -30, -30,
|
|
|
|
|
-30, -30, -29, -29, -29, -29, -29, -28, -28, -28,
|
|
|
|
|
-28, -28, -27, -27, -27, -27, -27, -27, -26, -26,
|
|
|
|
|
-26, -26, -26, -25, -25, -25, -25, -25, -24, -24,
|
|
|
|
|
-24, -24, -24, -24, -23, -23, -23, -23, -23, -22,
|
|
|
|
|
-22, -22, -22, -22, -21, -21, -21, -21, -21, -21,
|
|
|
|
|
-20, -20, -20, -20, -20, -19, -19, -19, -19, -19,
|
|
|
|
|
-18, -18, -18, -18, -18, -18, -17, -17, -17, -17,
|
|
|
|
|
-17, -16, -16, -16, -16, -16, -15, -15, -15, -15,
|
|
|
|
|
-15, -15, -14, -14, -14, -14, -14, -13, -13, -13,
|
|
|
|
|
-13, -13, -12, -12, -12, -12, -12, -12, -11, -11,
|
|
|
|
|
-11, -11, -11, -10, -10, -10, -10, -10, -9, -9,
|
|
|
|
|
-9, -9, -9, -9, -8, -8, -8, -8, -8, -7,
|
|
|
|
|
-7, -7, -7, -7, -6, -6, -6, -6, -6, -6,
|
|
|
|
|
-5, -5, -5, -5, -5, -4, -4, -4, -4, -4,
|
|
|
|
|
-3, -3, -3, -3, -3, -3, -2, -2, -2, -2,
|
|
|
|
|
-2, -1, -1, -1, -1, -1, 0, 0, 0, 0,
|
|
|
|
|
0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
|
|
|
|
1, 1, 2, 2, 2, 2, 2, 3, 3, 3,
|
|
|
|
|
3, 3, 3, 4, 4, 4, 4, 4, 5, 5,
|
|
|
|
|
5, 5, 5, 6, 6, 6, 6, 6, 6, 7,
|
|
|
|
|
7, 7, 7, 7, 8, 8, 8, 8, 8, 9,
|
|
|
|
|
9, 9, 9, 9, 9, 10, 10, 10, 10, 10,
|
|
|
|
|
11, 11, 11, 11, 11, 12, 12, 12, 12, 12,
|
|
|
|
|
12, 13, 13, 13, 13, 13, 14, 14, 14, 14,
|
|
|
|
|
14, 15, 15, 15, 15, 15, 15, 16, 16, 16,
|
|
|
|
|
16, 16, 17, 17, 17, 17, 17, 18, 18, 18,
|
|
|
|
|
18, 18, 18, 19, 19, 19, 19, 19, 20, 20,
|
|
|
|
|
20, 20, 20, 21, 21, 21, 21, 21, 21, 22,
|
|
|
|
|
22, 22, 22, 22, 23, 23, 23, 23, 23, 24,
|
|
|
|
|
24, 24, 24, 24, 24, 25, 25, 25, 25, 25,
|
|
|
|
|
26, 26, 26, 26, 26, 27, 27, 27, 27, 27,
|
|
|
|
|
27, 28, 28, 28, 28, 28, 29, 29, 29, 29,
|
|
|
|
|
29, 30, 30, 30, 30, 30, 30, 31, 31, 31,
|
|
|
|
|
31, 31, 32, 32, 32, 32, 32, 33, 33, 33,
|
|
|
|
|
33, 33, 33, 34, 34, 34, 34, 34, 35, 35,
|
|
|
|
|
35, 35, 35, 36, 36, 36, 36, 36, 36, 37,
|
|
|
|
|
37, 37, 37, 37, 38, 38, 38, 38, 38, 39,
|
|
|
|
|
39, 39, 39, 39, 39, 40, 40, 40, 40, 40,
|
|
|
|
|
41, 41, 41, 41, 41, 42, 42, 42, 42, 42,
|
|
|
|
|
42, 43, 43, 43, 43, 43, 44, 44, 44, 44,
|
|
|
|
|
44, 45, 45, 45, 45, 45, 45, 46, 46, 46,
|
|
|
|
|
46, 46, 47, 47, 47, 47, 47, 48, 48, 48,
|
|
|
|
|
48, 48, 48, 49, 49, 49, 49, 49, 50, 50,
|
|
|
|
|
50, 50, 50, 51, 51, 51, 51, 51, 51, 52,
|
|
|
|
|
52, 52, 52, 52, 53, 53, 53, 53, 53, 54,
|
|
|
|
|
54, 54, 54, 54, 54, 55, 55, 55, 55, 55,
|
|
|
|
|
56, 56, 56, 56, 56, 57, 57, 57, 57, 57,
|
|
|
|
|
57, 58, 58, 58, 58, 58, 59, 59, 59, 59,
|
|
|
|
|
59, 60, 60, 60, 60, 60, 60, 61, 61, 61,
|
|
|
|
|
61, 61, 62, 62, 62, 62, 62, 63, 63, 63,
|
|
|
|
|
63, 63, 63, 64, 64, 64, 64, 64, 65, 65,
|
|
|
|
|
65, 65, 65, 66, 66, 66, 66, 66, 66, 67,
|
|
|
|
|
67, 67, 67, 67, 68, 68, 68, 68, 68, 69,
|
|
|
|
|
69, 69, 69, 69, 69, 70, 70, 70, 70, 70,
|
|
|
|
|
71, 71, 71, 71, 71, 72, 72, 72, 72, 72,
|
|
|
|
|
72, 73, 73, 73, 73, 73, 74, 74, 74, 74,
|
|
|
|
|
74, 75, 75, 75, 75, 75, 75, 76, 76, 76,
|
|
|
|
|
76, 76, 77, 77, 77, 77, 77, 78, 78, 78,
|
|
|
|
|
78, 78, 78, 79, 79, 79, 79, 79, 80, 80,
|
|
|
|
|
80, 80, 80, 81, 81, 81, 81, 81, 81, 82,
|
|
|
|
|
82, 82, 82, 82, 83, 83, 83, 83, 83, 84,
|
|
|
|
|
84, 84, 84, 84, 84, 85, 85, 85, 85, 85,
|
|
|
|
|
86, 86, 86, 86, 86, 87, 87, 87, 87, 87,
|
|
|
|
|
87, 88, 88, 88, 88, 88, 89, 89, 89, 89,
|
|
|
|
|
89, 90, 90, 90, 90, 90, 90, 91, 91, 91,
|
|
|
|
|
91, 91, 92, 92, 92, 92, 92, 93, 93, 93,
|
|
|
|
|
93, 93, 93, 94, 94, 94, 94, 94, 95, 95,
|
|
|
|
|
95, 95, 95, 96, 96,
|
|
|
|
|
};
|
|
|
|
|
|
2005-02-27 22:03:50 +08:00
|
|
|
static const gshort floyd_steinberg_error3[] = {
|
1997-11-25 06:05:25 +08:00
|
|
|
-159, -159, -159, -158, -158, -158, -157, -157, -157, -156,
|
|
|
|
|
-156, -156, -155, -155, -155, -155, -154, -154, -154, -153,
|
|
|
|
|
-153, -153, -152, -152, -152, -151, -151, -151, -150, -150,
|
|
|
|
|
-150, -150, -149, -149, -149, -148, -148, -148, -147, -147,
|
|
|
|
|
-147, -146, -146, -146, -145, -145, -145, -145, -144, -144,
|
|
|
|
|
-144, -143, -143, -143, -142, -142, -142, -141, -141, -141,
|
|
|
|
|
-140, -140, -140, -140, -139, -139, -139, -138, -138, -138,
|
|
|
|
|
-137, -137, -137, -136, -136, -136, -135, -135, -135, -135,
|
|
|
|
|
-134, -134, -134, -133, -133, -133, -132, -132, -132, -131,
|
|
|
|
|
-131, -131, -130, -130, -130, -130, -129, -129, -129, -128,
|
|
|
|
|
-128, -128, -127, -127, -127, -126, -126, -126, -125, -125,
|
|
|
|
|
-125, -125, -124, -124, -124, -123, -123, -123, -122, -122,
|
|
|
|
|
-122, -121, -121, -121, -120, -120, -120, -120, -119, -119,
|
|
|
|
|
-119, -118, -118, -118, -117, -117, -117, -116, -116, -116,
|
|
|
|
|
-115, -115, -115, -115, -114, -114, -114, -113, -113, -113,
|
|
|
|
|
-112, -112, -112, -111, -111, -111, -110, -110, -110, -110,
|
|
|
|
|
-109, -109, -109, -108, -108, -108, -107, -107, -107, -106,
|
|
|
|
|
-106, -106, -105, -105, -105, -105, -104, -104, -104, -103,
|
|
|
|
|
-103, -103, -102, -102, -102, -101, -101, -101, -100, -100,
|
|
|
|
|
-100, -100, -99, -99, -99, -98, -98, -98, -97, -97,
|
|
|
|
|
-97, -96, -96, -96, -95, -95, -95, -95, -94, -94,
|
|
|
|
|
-94, -93, -93, -93, -92, -92, -92, -91, -91, -91,
|
|
|
|
|
-90, -90, -90, -90, -89, -89, -89, -88, -88, -88,
|
|
|
|
|
-87, -87, -87, -86, -86, -86, -85, -85, -85, -85,
|
|
|
|
|
-84, -84, -84, -83, -83, -83, -82, -82, -82, -81,
|
|
|
|
|
-81, -81, -80, -80, -80, -80, -79, -79, -79, -78,
|
|
|
|
|
-78, -78, -77, -77, -77, -76, -76, -76, -75, -75,
|
|
|
|
|
-75, -75, -74, -74, -74, -73, -73, -73, -72, -72,
|
|
|
|
|
-72, -71, -71, -71, -70, -70, -70, -70, -69, -69,
|
|
|
|
|
-69, -68, -68, -68, -67, -67, -67, -66, -66, -66,
|
|
|
|
|
-65, -65, -65, -65, -64, -64, -64, -63, -63, -63,
|
|
|
|
|
-62, -62, -62, -61, -61, -61, -60, -60, -60, -60,
|
|
|
|
|
-59, -59, -59, -58, -58, -58, -57, -57, -57, -56,
|
|
|
|
|
-56, -56, -55, -55, -55, -55, -54, -54, -54, -53,
|
|
|
|
|
-53, -53, -52, -52, -52, -51, -51, -51, -50, -50,
|
|
|
|
|
-50, -50, -49, -49, -49, -48, -48, -48, -47, -47,
|
|
|
|
|
-47, -46, -46, -46, -45, -45, -45, -45, -44, -44,
|
|
|
|
|
-44, -43, -43, -43, -42, -42, -42, -41, -41, -41,
|
|
|
|
|
-40, -40, -40, -40, -39, -39, -39, -38, -38, -38,
|
|
|
|
|
-37, -37, -37, -36, -36, -36, -35, -35, -35, -35,
|
|
|
|
|
-34, -34, -34, -33, -33, -33, -32, -32, -32, -31,
|
|
|
|
|
-31, -31, -30, -30, -30, -30, -29, -29, -29, -28,
|
|
|
|
|
-28, -28, -27, -27, -27, -26, -26, -26, -25, -25,
|
|
|
|
|
-25, -25, -24, -24, -24, -23, -23, -23, -22, -22,
|
|
|
|
|
-22, -21, -21, -21, -20, -20, -20, -20, -19, -19,
|
|
|
|
|
-19, -18, -18, -18, -17, -17, -17, -16, -16, -16,
|
|
|
|
|
-15, -15, -15, -15, -14, -14, -14, -13, -13, -13,
|
|
|
|
|
-12, -12, -12, -11, -11, -11, -10, -10, -10, -10,
|
|
|
|
|
-9, -9, -9, -8, -8, -8, -7, -7, -7, -6,
|
|
|
|
|
-6, -6, -5, -5, -5, -5, -4, -4, -4, -3,
|
|
|
|
|
-3, -3, -2, -2, -2, -1, -1, -1, 0, 0,
|
|
|
|
|
0, 0, 0, 0, 0, 1, 1, 1, 2, 2,
|
|
|
|
|
2, 3, 3, 3, 4, 4, 4, 5, 5, 5,
|
|
|
|
|
5, 6, 6, 6, 7, 7, 7, 8, 8, 8,
|
|
|
|
|
9, 9, 9, 10, 10, 10, 10, 11, 11, 11,
|
|
|
|
|
12, 12, 12, 13, 13, 13, 14, 14, 14, 15,
|
|
|
|
|
15, 15, 15, 16, 16, 16, 17, 17, 17, 18,
|
|
|
|
|
18, 18, 19, 19, 19, 20, 20, 20, 20, 21,
|
|
|
|
|
21, 21, 22, 22, 22, 23, 23, 23, 24, 24,
|
|
|
|
|
24, 25, 25, 25, 25, 26, 26, 26, 27, 27,
|
|
|
|
|
27, 28, 28, 28, 29, 29, 29, 30, 30, 30,
|
|
|
|
|
30, 31, 31, 31, 32, 32, 32, 33, 33, 33,
|
|
|
|
|
34, 34, 34, 35, 35, 35, 35, 36, 36, 36,
|
|
|
|
|
37, 37, 37, 38, 38, 38, 39, 39, 39, 40,
|
|
|
|
|
40, 40, 40, 41, 41, 41, 42, 42, 42, 43,
|
|
|
|
|
43, 43, 44, 44, 44, 45, 45, 45, 45, 46,
|
|
|
|
|
46, 46, 47, 47, 47, 48, 48, 48, 49, 49,
|
|
|
|
|
49, 50, 50, 50, 50, 51, 51, 51, 52, 52,
|
|
|
|
|
52, 53, 53, 53, 54, 54, 54, 55, 55, 55,
|
|
|
|
|
55, 56, 56, 56, 57, 57, 57, 58, 58, 58,
|
|
|
|
|
59, 59, 59, 60, 60, 60, 60, 61, 61, 61,
|
|
|
|
|
62, 62, 62, 63, 63, 63, 64, 64, 64, 65,
|
|
|
|
|
65, 65, 65, 66, 66, 66, 67, 67, 67, 68,
|
|
|
|
|
68, 68, 69, 69, 69, 70, 70, 70, 70, 71,
|
|
|
|
|
71, 71, 72, 72, 72, 73, 73, 73, 74, 74,
|
|
|
|
|
74, 75, 75, 75, 75, 76, 76, 76, 77, 77,
|
|
|
|
|
77, 78, 78, 78, 79, 79, 79, 80, 80, 80,
|
|
|
|
|
80, 81, 81, 81, 82, 82, 82, 83, 83, 83,
|
|
|
|
|
84, 84, 84, 85, 85, 85, 85, 86, 86, 86,
|
|
|
|
|
87, 87, 87, 88, 88, 88, 89, 89, 89, 90,
|
|
|
|
|
90, 90, 90, 91, 91, 91, 92, 92, 92, 93,
|
|
|
|
|
93, 93, 94, 94, 94, 95, 95, 95, 95, 96,
|
|
|
|
|
96, 96, 97, 97, 97, 98, 98, 98, 99, 99,
|
|
|
|
|
99, 100, 100, 100, 100, 101, 101, 101, 102, 102,
|
|
|
|
|
102, 103, 103, 103, 104, 104, 104, 105, 105, 105,
|
|
|
|
|
105, 106, 106, 106, 107, 107, 107, 108, 108, 108,
|
|
|
|
|
109, 109, 109, 110, 110, 110, 110, 111, 111, 111,
|
|
|
|
|
112, 112, 112, 113, 113, 113, 114, 114, 114, 115,
|
|
|
|
|
115, 115, 115, 116, 116, 116, 117, 117, 117, 118,
|
|
|
|
|
118, 118, 119, 119, 119, 120, 120, 120, 120, 121,
|
|
|
|
|
121, 121, 122, 122, 122, 123, 123, 123, 124, 124,
|
|
|
|
|
124, 125, 125, 125, 125, 126, 126, 126, 127, 127,
|
|
|
|
|
127, 128, 128, 128, 129, 129, 129, 130, 130, 130,
|
|
|
|
|
130, 131, 131, 131, 132, 132, 132, 133, 133, 133,
|
|
|
|
|
134, 134, 134, 135, 135, 135, 135, 136, 136, 136,
|
|
|
|
|
137, 137, 137, 138, 138, 138, 139, 139, 139, 140,
|
|
|
|
|
140, 140, 140, 141, 141, 141, 142, 142, 142, 143,
|
|
|
|
|
143, 143, 144, 144, 144, 145, 145, 145, 145, 146,
|
|
|
|
|
146, 146, 147, 147, 147, 148, 148, 148, 149, 149,
|
|
|
|
|
149, 150, 150, 150, 150, 151, 151, 151, 152, 152,
|
|
|
|
|
152, 153, 153, 153, 154, 154, 154, 155, 155, 155,
|
|
|
|
|
155, 156, 156, 156, 157, 157, 157, 158, 158, 158,
|
|
|
|
|
159, 159, 159, 160, 160,
|
|
|
|
|
};
|
|
|
|
|
|
2005-02-27 22:03:50 +08:00
|
|
|
static const gshort floyd_steinberg_error4[] = {
|
1997-11-25 06:05:25 +08:00
|
|
|
-34, -33, -33, -33, -33, -33, -34, -33, -32, -33,
|
|
|
|
|
-33, -33, -33, -33, -32, -31, -33, -32, -32, -32,
|
|
|
|
|
-32, -32, -33, -32, -31, -32, -32, -32, -32, -32,
|
|
|
|
|
-31, -30, -32, -31, -31, -31, -31, -31, -32, -31,
|
|
|
|
|
-30, -31, -31, -31, -31, -31, -30, -29, -31, -30,
|
|
|
|
|
-30, -30, -30, -30, -31, -30, -29, -30, -30, -30,
|
|
|
|
|
-30, -30, -29, -28, -30, -29, -29, -29, -29, -29,
|
|
|
|
|
-30, -29, -28, -29, -29, -29, -29, -29, -28, -27,
|
|
|
|
|
-29, -28, -28, -28, -28, -28, -29, -28, -27, -28,
|
|
|
|
|
-28, -28, -28, -28, -27, -26, -28, -27, -27, -27,
|
|
|
|
|
-27, -27, -28, -27, -26, -27, -27, -27, -27, -27,
|
|
|
|
|
-26, -25, -27, -26, -26, -26, -26, -26, -27, -26,
|
|
|
|
|
-25, -26, -26, -26, -26, -26, -25, -24, -26, -25,
|
|
|
|
|
-25, -25, -25, -25, -26, -25, -24, -25, -25, -25,
|
|
|
|
|
-25, -25, -24, -23, -25, -24, -24, -24, -24, -24,
|
|
|
|
|
-25, -24, -23, -24, -24, -24, -24, -24, -23, -22,
|
|
|
|
|
-24, -23, -23, -23, -23, -23, -24, -23, -22, -23,
|
|
|
|
|
-23, -23, -23, -23, -22, -21, -23, -22, -22, -22,
|
|
|
|
|
-22, -22, -23, -22, -21, -22, -22, -22, -22, -22,
|
|
|
|
|
-21, -20, -22, -21, -21, -21, -21, -21, -22, -21,
|
|
|
|
|
-20, -21, -21, -21, -21, -21, -20, -19, -21, -20,
|
|
|
|
|
-20, -20, -20, -20, -21, -20, -19, -20, -20, -20,
|
|
|
|
|
-20, -20, -19, -18, -20, -19, -19, -19, -19, -19,
|
|
|
|
|
-20, -19, -18, -19, -19, -19, -19, -19, -18, -17,
|
|
|
|
|
-19, -18, -18, -18, -18, -18, -19, -18, -17, -18,
|
|
|
|
|
-18, -18, -18, -18, -17, -16, -18, -17, -17, -17,
|
|
|
|
|
-17, -17, -18, -17, -16, -17, -17, -17, -17, -17,
|
|
|
|
|
-16, -15, -17, -16, -16, -16, -16, -16, -17, -16,
|
|
|
|
|
-15, -16, -16, -16, -16, -16, -15, -14, -16, -15,
|
|
|
|
|
-15, -15, -15, -15, -16, -15, -14, -15, -15, -15,
|
|
|
|
|
-15, -15, -14, -13, -15, -14, -14, -14, -14, -14,
|
|
|
|
|
-15, -14, -13, -14, -14, -14, -14, -14, -13, -12,
|
|
|
|
|
-14, -13, -13, -13, -13, -13, -14, -13, -12, -13,
|
|
|
|
|
-13, -13, -13, -13, -12, -11, -13, -12, -12, -12,
|
|
|
|
|
-12, -12, -13, -12, -11, -12, -12, -12, -12, -12,
|
|
|
|
|
-11, -10, -12, -11, -11, -11, -11, -11, -12, -11,
|
|
|
|
|
-10, -11, -11, -11, -11, -11, -10, -9, -11, -10,
|
|
|
|
|
-10, -10, -10, -10, -11, -10, -9, -10, -10, -10,
|
|
|
|
|
-10, -10, -9, -8, -10, -9, -9, -9, -9, -9,
|
|
|
|
|
-10, -9, -8, -9, -9, -9, -9, -9, -8, -7,
|
|
|
|
|
-9, -8, -8, -8, -8, -8, -9, -8, -7, -8,
|
|
|
|
|
-8, -8, -8, -8, -7, -6, -8, -7, -7, -7,
|
|
|
|
|
-7, -7, -8, -7, -6, -7, -7, -7, -7, -7,
|
|
|
|
|
-6, -5, -7, -6, -6, -6, -6, -6, -7, -6,
|
|
|
|
|
-5, -6, -6, -6, -6, -6, -5, -4, -6, -5,
|
|
|
|
|
-5, -5, -5, -5, -6, -5, -4, -5, -5, -5,
|
|
|
|
|
-5, -5, -4, -3, -5, -4, -4, -4, -4, -4,
|
|
|
|
|
-5, -4, -3, -4, -4, -4, -4, -4, -3, -2,
|
|
|
|
|
-4, -3, -3, -3, -3, -3, -4, -3, -2, -3,
|
|
|
|
|
-3, -3, -3, -3, -2, -1, -3, -2, -2, -2,
|
|
|
|
|
-2, -2, -3, -2, -1, -2, -2, -2, -2, -2,
|
|
|
|
|
-1, 0, 1, 2, 2, 2, 2, 2, 1, 2,
|
|
|
|
|
3, 2, 2, 2, 2, 2, 3, 1, 2, 3,
|
|
|
|
|
3, 3, 3, 3, 2, 3, 4, 3, 3, 3,
|
|
|
|
|
3, 3, 4, 2, 3, 4, 4, 4, 4, 4,
|
|
|
|
|
3, 4, 5, 4, 4, 4, 4, 4, 5, 3,
|
|
|
|
|
4, 5, 5, 5, 5, 5, 4, 5, 6, 5,
|
|
|
|
|
5, 5, 5, 5, 6, 4, 5, 6, 6, 6,
|
|
|
|
|
6, 6, 5, 6, 7, 6, 6, 6, 6, 6,
|
|
|
|
|
7, 5, 6, 7, 7, 7, 7, 7, 6, 7,
|
|
|
|
|
8, 7, 7, 7, 7, 7, 8, 6, 7, 8,
|
|
|
|
|
8, 8, 8, 8, 7, 8, 9, 8, 8, 8,
|
|
|
|
|
8, 8, 9, 7, 8, 9, 9, 9, 9, 9,
|
|
|
|
|
8, 9, 10, 9, 9, 9, 9, 9, 10, 8,
|
|
|
|
|
9, 10, 10, 10, 10, 10, 9, 10, 11, 10,
|
|
|
|
|
10, 10, 10, 10, 11, 9, 10, 11, 11, 11,
|
|
|
|
|
11, 11, 10, 11, 12, 11, 11, 11, 11, 11,
|
|
|
|
|
12, 10, 11, 12, 12, 12, 12, 12, 11, 12,
|
|
|
|
|
13, 12, 12, 12, 12, 12, 13, 11, 12, 13,
|
|
|
|
|
13, 13, 13, 13, 12, 13, 14, 13, 13, 13,
|
|
|
|
|
13, 13, 14, 12, 13, 14, 14, 14, 14, 14,
|
|
|
|
|
13, 14, 15, 14, 14, 14, 14, 14, 15, 13,
|
|
|
|
|
14, 15, 15, 15, 15, 15, 14, 15, 16, 15,
|
|
|
|
|
15, 15, 15, 15, 16, 14, 15, 16, 16, 16,
|
|
|
|
|
16, 16, 15, 16, 17, 16, 16, 16, 16, 16,
|
|
|
|
|
17, 15, 16, 17, 17, 17, 17, 17, 16, 17,
|
|
|
|
|
18, 17, 17, 17, 17, 17, 18, 16, 17, 18,
|
|
|
|
|
18, 18, 18, 18, 17, 18, 19, 18, 18, 18,
|
|
|
|
|
18, 18, 19, 17, 18, 19, 19, 19, 19, 19,
|
|
|
|
|
18, 19, 20, 19, 19, 19, 19, 19, 20, 18,
|
|
|
|
|
19, 20, 20, 20, 20, 20, 19, 20, 21, 20,
|
|
|
|
|
20, 20, 20, 20, 21, 19, 20, 21, 21, 21,
|
|
|
|
|
21, 21, 20, 21, 22, 21, 21, 21, 21, 21,
|
|
|
|
|
22, 20, 21, 22, 22, 22, 22, 22, 21, 22,
|
|
|
|
|
23, 22, 22, 22, 22, 22, 23, 21, 22, 23,
|
|
|
|
|
23, 23, 23, 23, 22, 23, 24, 23, 23, 23,
|
|
|
|
|
23, 23, 24, 22, 23, 24, 24, 24, 24, 24,
|
|
|
|
|
23, 24, 25, 24, 24, 24, 24, 24, 25, 23,
|
|
|
|
|
24, 25, 25, 25, 25, 25, 24, 25, 26, 25,
|
|
|
|
|
25, 25, 25, 25, 26, 24, 25, 26, 26, 26,
|
|
|
|
|
26, 26, 25, 26, 27, 26, 26, 26, 26, 26,
|
|
|
|
|
27, 25, 26, 27, 27, 27, 27, 27, 26, 27,
|
|
|
|
|
28, 27, 27, 27, 27, 27, 28, 26, 27, 28,
|
|
|
|
|
28, 28, 28, 28, 27, 28, 29, 28, 28, 28,
|
|
|
|
|
28, 28, 29, 27, 28, 29, 29, 29, 29, 29,
|
|
|
|
|
28, 29, 30, 29, 29, 29, 29, 29, 30, 28,
|
|
|
|
|
29, 30, 30, 30, 30, 30, 29, 30, 31, 30,
|
|
|
|
|
30, 30, 30, 30, 31, 29, 30, 31, 31, 31,
|
|
|
|
|
31, 31, 30, 31, 32, 31, 31, 31, 31, 31,
|
|
|
|
|
32, 30, 31, 32, 32, 32, 32, 32, 31, 32,
|
|
|
|
|
33, 32, 32, 32, 32, 32, 33, 31, 32, 33,
|
|
|
|
|
33, 33, 33, 33, 32, 33, 34, 33, 33, 33,
|
|
|
|
|
33, 33, 34, 32, 33,
|
|
|
|
|
};
|
|
|
|
|
|
2001-05-16 00:42:08 +08:00
|
|
|
#endif /* __GIMP_IMAGE_CONVERT_FSDITHER_H__ */
|
