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dither.c
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dither.c
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/*
* Copyright (c) 2014-2018 Hayaki Saito
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#if HAVE_LIMITS_H
# include <limits.h>
#endif
#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#include "dither.h"
#include "quant.h"
#include <sixel.h>
static const unsigned char pal_mono_dark[] = {
0x00, 0x00, 0x00, 0xff, 0xff, 0xff
};
static const unsigned char pal_mono_light[] = {
0xff, 0xff, 0xff, 0x00, 0x00, 0x00
};
static const unsigned char pal_gray_1bit[] = {
0x00, 0x00, 0x00, 0xff, 0xff, 0xff
};
static const unsigned char pal_gray_2bit[] = {
0x00, 0x00, 0x00, 0x55, 0x55, 0x55, 0xaa, 0xaa, 0xaa, 0xff, 0xff, 0xff
};
static const unsigned char pal_gray_4bit[] = {
0x00, 0x00, 0x00, 0x11, 0x11, 0x11, 0x22, 0x22, 0x22, 0x33, 0x33, 0x33,
0x44, 0x44, 0x44, 0x55, 0x55, 0x55, 0x66, 0x66, 0x66, 0x77, 0x77, 0x77,
0x88, 0x88, 0x88, 0x99, 0x99, 0x99, 0xaa, 0xaa, 0xaa, 0xbb, 0xbb, 0xbb,
0xcc, 0xcc, 0xcc, 0xdd, 0xdd, 0xdd, 0xee, 0xee, 0xee, 0xff, 0xff, 0xff
};
static const unsigned char pal_gray_8bit[] = {
0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x06, 0x06, 0x06, 0x07, 0x07, 0x07,
0x08, 0x08, 0x08, 0x09, 0x09, 0x09, 0x0a, 0x0a, 0x0a, 0x0b, 0x0b, 0x0b,
0x0c, 0x0c, 0x0c, 0x0d, 0x0d, 0x0d, 0x0e, 0x0e, 0x0e, 0x0f, 0x0f, 0x0f,
0x10, 0x10, 0x10, 0x11, 0x11, 0x11, 0x12, 0x12, 0x12, 0x13, 0x13, 0x13,
0x14, 0x14, 0x14, 0x15, 0x15, 0x15, 0x16, 0x16, 0x16, 0x17, 0x17, 0x17,
0x18, 0x18, 0x18, 0x19, 0x19, 0x19, 0x1a, 0x1a, 0x1a, 0x1b, 0x1b, 0x1b,
0x1c, 0x1c, 0x1c, 0x1d, 0x1d, 0x1d, 0x1e, 0x1e, 0x1e, 0x1f, 0x1f, 0x1f,
0x20, 0x20, 0x20, 0x21, 0x21, 0x21, 0x22, 0x22, 0x22, 0x23, 0x23, 0x23,
0x24, 0x24, 0x24, 0x25, 0x25, 0x25, 0x26, 0x26, 0x26, 0x27, 0x27, 0x27,
0x28, 0x28, 0x28, 0x29, 0x29, 0x29, 0x2a, 0x2a, 0x2a, 0x2b, 0x2b, 0x2b,
0x2c, 0x2c, 0x2c, 0x2d, 0x2d, 0x2d, 0x2e, 0x2e, 0x2e, 0x2f, 0x2f, 0x2f,
0x30, 0x30, 0x30, 0x31, 0x31, 0x31, 0x32, 0x32, 0x32, 0x33, 0x33, 0x33,
0x34, 0x34, 0x34, 0x35, 0x35, 0x35, 0x36, 0x36, 0x36, 0x37, 0x37, 0x37,
0x38, 0x38, 0x38, 0x39, 0x39, 0x39, 0x3a, 0x3a, 0x3a, 0x3b, 0x3b, 0x3b,
0x3c, 0x3c, 0x3c, 0x3d, 0x3d, 0x3d, 0x3e, 0x3e, 0x3e, 0x3f, 0x3f, 0x3f,
0x40, 0x40, 0x40, 0x41, 0x41, 0x41, 0x42, 0x42, 0x42, 0x43, 0x43, 0x43,
0x44, 0x44, 0x44, 0x45, 0x45, 0x45, 0x46, 0x46, 0x46, 0x47, 0x47, 0x47,
0x48, 0x48, 0x48, 0x49, 0x49, 0x49, 0x4a, 0x4a, 0x4a, 0x4b, 0x4b, 0x4b,
0x4c, 0x4c, 0x4c, 0x4d, 0x4d, 0x4d, 0x4e, 0x4e, 0x4e, 0x4f, 0x4f, 0x4f,
0x50, 0x50, 0x50, 0x51, 0x51, 0x51, 0x52, 0x52, 0x52, 0x53, 0x53, 0x53,
0x54, 0x54, 0x54, 0x55, 0x55, 0x55, 0x56, 0x56, 0x56, 0x57, 0x57, 0x57,
0x58, 0x58, 0x58, 0x59, 0x59, 0x59, 0x5a, 0x5a, 0x5a, 0x5b, 0x5b, 0x5b,
0x5c, 0x5c, 0x5c, 0x5d, 0x5d, 0x5d, 0x5e, 0x5e, 0x5e, 0x5f, 0x5f, 0x5f,
0x60, 0x60, 0x60, 0x61, 0x61, 0x61, 0x62, 0x62, 0x62, 0x63, 0x63, 0x63,
0x64, 0x64, 0x64, 0x65, 0x65, 0x65, 0x66, 0x66, 0x66, 0x67, 0x67, 0x67,
0x68, 0x68, 0x68, 0x69, 0x69, 0x69, 0x6a, 0x6a, 0x6a, 0x6b, 0x6b, 0x6b,
0x6c, 0x6c, 0x6c, 0x6d, 0x6d, 0x6d, 0x6e, 0x6e, 0x6e, 0x6f, 0x6f, 0x6f,
0x70, 0x70, 0x70, 0x71, 0x71, 0x71, 0x72, 0x72, 0x72, 0x73, 0x73, 0x73,
0x74, 0x74, 0x74, 0x75, 0x75, 0x75, 0x76, 0x76, 0x76, 0x77, 0x77, 0x77,
0x78, 0x78, 0x78, 0x79, 0x79, 0x79, 0x7a, 0x7a, 0x7a, 0x7b, 0x7b, 0x7b,
0x7c, 0x7c, 0x7c, 0x7d, 0x7d, 0x7d, 0x7e, 0x7e, 0x7e, 0x7f, 0x7f, 0x7f,
0x80, 0x80, 0x80, 0x81, 0x81, 0x81, 0x82, 0x82, 0x82, 0x83, 0x83, 0x83,
0x84, 0x84, 0x84, 0x85, 0x85, 0x85, 0x86, 0x86, 0x86, 0x87, 0x87, 0x87,
0x88, 0x88, 0x88, 0x89, 0x89, 0x89, 0x8a, 0x8a, 0x8a, 0x8b, 0x8b, 0x8b,
0x8c, 0x8c, 0x8c, 0x8d, 0x8d, 0x8d, 0x8e, 0x8e, 0x8e, 0x8f, 0x8f, 0x8f,
0x90, 0x90, 0x90, 0x91, 0x91, 0x91, 0x92, 0x92, 0x92, 0x93, 0x93, 0x93,
0x94, 0x94, 0x94, 0x95, 0x95, 0x95, 0x96, 0x96, 0x96, 0x97, 0x97, 0x97,
0x98, 0x98, 0x98, 0x99, 0x99, 0x99, 0x9a, 0x9a, 0x9a, 0x9b, 0x9b, 0x9b,
0x9c, 0x9c, 0x9c, 0x9d, 0x9d, 0x9d, 0x9e, 0x9e, 0x9e, 0x9f, 0x9f, 0x9f,
0xa0, 0xa0, 0xa0, 0xa1, 0xa1, 0xa1, 0xa2, 0xa2, 0xa2, 0xa3, 0xa3, 0xa3,
0xa4, 0xa4, 0xa4, 0xa5, 0xa5, 0xa5, 0xa6, 0xa6, 0xa6, 0xa7, 0xa7, 0xa7,
0xa8, 0xa8, 0xa8, 0xa9, 0xa9, 0xa9, 0xaa, 0xaa, 0xaa, 0xab, 0xab, 0xab,
0xac, 0xac, 0xac, 0xad, 0xad, 0xad, 0xae, 0xae, 0xae, 0xaf, 0xaf, 0xaf,
0xb0, 0xb0, 0xb0, 0xb1, 0xb1, 0xb1, 0xb2, 0xb2, 0xb2, 0xb3, 0xb3, 0xb3,
0xb4, 0xb4, 0xb4, 0xb5, 0xb5, 0xb5, 0xb6, 0xb6, 0xb6, 0xb7, 0xb7, 0xb7,
0xb8, 0xb8, 0xb8, 0xb9, 0xb9, 0xb9, 0xba, 0xba, 0xba, 0xbb, 0xbb, 0xbb,
0xbc, 0xbc, 0xbc, 0xbd, 0xbd, 0xbd, 0xbe, 0xbe, 0xbe, 0xbf, 0xbf, 0xbf,
0xc0, 0xc0, 0xc0, 0xc1, 0xc1, 0xc1, 0xc2, 0xc2, 0xc2, 0xc3, 0xc3, 0xc3,
0xc4, 0xc4, 0xc4, 0xc5, 0xc5, 0xc5, 0xc6, 0xc6, 0xc6, 0xc7, 0xc7, 0xc7,
0xc8, 0xc8, 0xc8, 0xc9, 0xc9, 0xc9, 0xca, 0xca, 0xca, 0xcb, 0xcb, 0xcb,
0xcc, 0xcc, 0xcc, 0xcd, 0xcd, 0xcd, 0xce, 0xce, 0xce, 0xcf, 0xcf, 0xcf,
0xd0, 0xd0, 0xd0, 0xd1, 0xd1, 0xd1, 0xd2, 0xd2, 0xd2, 0xd3, 0xd3, 0xd3,
0xd4, 0xd4, 0xd4, 0xd5, 0xd5, 0xd5, 0xd6, 0xd6, 0xd6, 0xd7, 0xd7, 0xd7,
0xd8, 0xd8, 0xd8, 0xd9, 0xd9, 0xd9, 0xda, 0xda, 0xda, 0xdb, 0xdb, 0xdb,
0xdc, 0xdc, 0xdc, 0xdd, 0xdd, 0xdd, 0xde, 0xde, 0xde, 0xdf, 0xdf, 0xdf,
0xe0, 0xe0, 0xe0, 0xe1, 0xe1, 0xe1, 0xe2, 0xe2, 0xe2, 0xe3, 0xe3, 0xe3,
0xe4, 0xe4, 0xe4, 0xe5, 0xe5, 0xe5, 0xe6, 0xe6, 0xe6, 0xe7, 0xe7, 0xe7,
0xe8, 0xe8, 0xe8, 0xe9, 0xe9, 0xe9, 0xea, 0xea, 0xea, 0xeb, 0xeb, 0xeb,
0xec, 0xec, 0xec, 0xed, 0xed, 0xed, 0xee, 0xee, 0xee, 0xef, 0xef, 0xef,
0xf0, 0xf0, 0xf0, 0xf1, 0xf1, 0xf1, 0xf2, 0xf2, 0xf2, 0xf3, 0xf3, 0xf3,
0xf4, 0xf4, 0xf4, 0xf5, 0xf5, 0xf5, 0xf6, 0xf6, 0xf6, 0xf7, 0xf7, 0xf7,
0xf8, 0xf8, 0xf8, 0xf9, 0xf9, 0xf9, 0xfa, 0xfa, 0xfa, 0xfb, 0xfb, 0xfb,
0xfc, 0xfc, 0xfc, 0xfd, 0xfd, 0xfd, 0xfe, 0xfe, 0xfe, 0xff, 0xff, 0xff
};
static const unsigned char pal_xterm256[] = {
0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x80, 0x80, 0x00,
0x00, 0x00, 0x80, 0x80, 0x00, 0x80, 0x00, 0x80, 0x80, 0xc0, 0xc0, 0xc0,
0x80, 0x80, 0x80, 0xff, 0x00, 0x00, 0x00, 0xff, 0x00, 0xff, 0xff, 0x00,
0x00, 0x00, 0xff, 0xff, 0x00, 0xff, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00, 0x00, 0x5f, 0x00, 0x00, 0x87, 0x00, 0x00, 0xaf,
0x00, 0x00, 0xd7, 0x00, 0x00, 0xff, 0x00, 0x5f, 0x00, 0x00, 0x5f, 0x5f,
0x00, 0x5f, 0x87, 0x00, 0x5f, 0xaf, 0x00, 0x5f, 0xd7, 0x00, 0x5f, 0xff,
0x00, 0x87, 0x00, 0x00, 0x87, 0x5f, 0x00, 0x87, 0x87, 0x00, 0x87, 0xaf,
0x00, 0x87, 0xd7, 0x00, 0x87, 0xff, 0x00, 0xaf, 0x00, 0x00, 0xaf, 0x5f,
0x00, 0xaf, 0x87, 0x00, 0xaf, 0xaf, 0x00, 0xaf, 0xd7, 0x00, 0xaf, 0xff,
0x00, 0xd7, 0x00, 0x00, 0xd7, 0x5f, 0x00, 0xd7, 0x87, 0x00, 0xd7, 0xaf,
0x00, 0xd7, 0xd7, 0x00, 0xd7, 0xff, 0x00, 0xff, 0x00, 0x00, 0xff, 0x5f,
0x00, 0xff, 0x87, 0x00, 0xff, 0xaf, 0x00, 0xff, 0xd7, 0x00, 0xff, 0xff,
0x5f, 0x00, 0x00, 0x5f, 0x00, 0x5f, 0x5f, 0x00, 0x87, 0x5f, 0x00, 0xaf,
0x5f, 0x00, 0xd7, 0x5f, 0x00, 0xff, 0x5f, 0x5f, 0x00, 0x5f, 0x5f, 0x5f,
0x5f, 0x5f, 0x87, 0x5f, 0x5f, 0xaf, 0x5f, 0x5f, 0xd7, 0x5f, 0x5f, 0xff,
0x5f, 0x87, 0x00, 0x5f, 0x87, 0x5f, 0x5f, 0x87, 0x87, 0x5f, 0x87, 0xaf,
0x5f, 0x87, 0xd7, 0x5f, 0x87, 0xff, 0x5f, 0xaf, 0x00, 0x5f, 0xaf, 0x5f,
0x5f, 0xaf, 0x87, 0x5f, 0xaf, 0xaf, 0x5f, 0xaf, 0xd7, 0x5f, 0xaf, 0xff,
0x5f, 0xd7, 0x00, 0x5f, 0xd7, 0x5f, 0x5f, 0xd7, 0x87, 0x5f, 0xd7, 0xaf,
0x5f, 0xd7, 0xd7, 0x5f, 0xd7, 0xff, 0x5f, 0xff, 0x00, 0x5f, 0xff, 0x5f,
0x5f, 0xff, 0x87, 0x5f, 0xff, 0xaf, 0x5f, 0xff, 0xd7, 0x5f, 0xff, 0xff,
0x87, 0x00, 0x00, 0x87, 0x00, 0x5f, 0x87, 0x00, 0x87, 0x87, 0x00, 0xaf,
0x87, 0x00, 0xd7, 0x87, 0x00, 0xff, 0x87, 0x5f, 0x00, 0x87, 0x5f, 0x5f,
0x87, 0x5f, 0x87, 0x87, 0x5f, 0xaf, 0x87, 0x5f, 0xd7, 0x87, 0x5f, 0xff,
0x87, 0x87, 0x00, 0x87, 0x87, 0x5f, 0x87, 0x87, 0x87, 0x87, 0x87, 0xaf,
0x87, 0x87, 0xd7, 0x87, 0x87, 0xff, 0x87, 0xaf, 0x00, 0x87, 0xaf, 0x5f,
0x87, 0xaf, 0x87, 0x87, 0xaf, 0xaf, 0x87, 0xaf, 0xd7, 0x87, 0xaf, 0xff,
0x87, 0xd7, 0x00, 0x87, 0xd7, 0x5f, 0x87, 0xd7, 0x87, 0x87, 0xd7, 0xaf,
0x87, 0xd7, 0xd7, 0x87, 0xd7, 0xff, 0x87, 0xff, 0x00, 0x87, 0xff, 0x5f,
0x87, 0xff, 0x87, 0x87, 0xff, 0xaf, 0x87, 0xff, 0xd7, 0x87, 0xff, 0xff,
0xaf, 0x00, 0x00, 0xaf, 0x00, 0x5f, 0xaf, 0x00, 0x87, 0xaf, 0x00, 0xaf,
0xaf, 0x00, 0xd7, 0xaf, 0x00, 0xff, 0xaf, 0x5f, 0x00, 0xaf, 0x5f, 0x5f,
0xaf, 0x5f, 0x87, 0xaf, 0x5f, 0xaf, 0xaf, 0x5f, 0xd7, 0xaf, 0x5f, 0xff,
0xaf, 0x87, 0x00, 0xaf, 0x87, 0x5f, 0xaf, 0x87, 0x87, 0xaf, 0x87, 0xaf,
0xaf, 0x87, 0xd7, 0xaf, 0x87, 0xff, 0xaf, 0xaf, 0x00, 0xaf, 0xaf, 0x5f,
0xaf, 0xaf, 0x87, 0xaf, 0xaf, 0xaf, 0xaf, 0xaf, 0xd7, 0xaf, 0xaf, 0xff,
0xaf, 0xd7, 0x00, 0xaf, 0xd7, 0x5f, 0xaf, 0xd7, 0x87, 0xaf, 0xd7, 0xaf,
0xaf, 0xd7, 0xd7, 0xaf, 0xd7, 0xff, 0xaf, 0xff, 0x00, 0xaf, 0xff, 0x5f,
0xaf, 0xff, 0x87, 0xaf, 0xff, 0xaf, 0xaf, 0xff, 0xd7, 0xaf, 0xff, 0xff,
0xd7, 0x00, 0x00, 0xd7, 0x00, 0x5f, 0xd7, 0x00, 0x87, 0xd7, 0x00, 0xaf,
0xd7, 0x00, 0xd7, 0xd7, 0x00, 0xff, 0xd7, 0x5f, 0x00, 0xd7, 0x5f, 0x5f,
0xd7, 0x5f, 0x87, 0xd7, 0x5f, 0xaf, 0xd7, 0x5f, 0xd7, 0xd7, 0x5f, 0xff,
0xd7, 0x87, 0x00, 0xd7, 0x87, 0x5f, 0xd7, 0x87, 0x87, 0xd7, 0x87, 0xaf,
0xd7, 0x87, 0xd7, 0xd7, 0x87, 0xff, 0xd7, 0xaf, 0x00, 0xd7, 0xaf, 0x5f,
0xd7, 0xaf, 0x87, 0xd7, 0xaf, 0xaf, 0xd7, 0xaf, 0xd7, 0xd7, 0xaf, 0xff,
0xd7, 0xd7, 0x00, 0xd7, 0xd7, 0x5f, 0xd7, 0xd7, 0x87, 0xd7, 0xd7, 0xaf,
0xd7, 0xd7, 0xd7, 0xd7, 0xd7, 0xff, 0xd7, 0xff, 0x00, 0xd7, 0xff, 0x5f,
0xd7, 0xff, 0x87, 0xd7, 0xff, 0xaf, 0xd7, 0xff, 0xd7, 0xd7, 0xff, 0xff,
0xff, 0x00, 0x00, 0xff, 0x00, 0x5f, 0xff, 0x00, 0x87, 0xff, 0x00, 0xaf,
0xff, 0x00, 0xd7, 0xff, 0x00, 0xff, 0xff, 0x5f, 0x00, 0xff, 0x5f, 0x5f,
0xff, 0x5f, 0x87, 0xff, 0x5f, 0xaf, 0xff, 0x5f, 0xd7, 0xff, 0x5f, 0xff,
0xff, 0x87, 0x00, 0xff, 0x87, 0x5f, 0xff, 0x87, 0x87, 0xff, 0x87, 0xaf,
0xff, 0x87, 0xd7, 0xff, 0x87, 0xff, 0xff, 0xaf, 0x00, 0xff, 0xaf, 0x5f,
0xff, 0xaf, 0x87, 0xff, 0xaf, 0xaf, 0xff, 0xaf, 0xd7, 0xff, 0xaf, 0xff,
0xff, 0xd7, 0x00, 0xff, 0xd7, 0x5f, 0xff, 0xd7, 0x87, 0xff, 0xd7, 0xaf,
0xff, 0xd7, 0xd7, 0xff, 0xd7, 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0x5f,
0xff, 0xff, 0x87, 0xff, 0xff, 0xaf, 0xff, 0xff, 0xd7, 0xff, 0xff, 0xff,
0x08, 0x08, 0x08, 0x12, 0x12, 0x12, 0x1c, 0x1c, 0x1c, 0x26, 0x26, 0x26,
0x30, 0x30, 0x30, 0x3a, 0x3a, 0x3a, 0x44, 0x44, 0x44, 0x4e, 0x4e, 0x4e,
0x58, 0x58, 0x58, 0x62, 0x62, 0x62, 0x6c, 0x6c, 0x6c, 0x76, 0x76, 0x76,
0x80, 0x80, 0x80, 0x8a, 0x8a, 0x8a, 0x94, 0x94, 0x94, 0x9e, 0x9e, 0x9e,
0xa8, 0xa8, 0xa8, 0xb2, 0xb2, 0xb2, 0xbc, 0xbc, 0xbc, 0xc6, 0xc6, 0xc6,
0xd0, 0xd0, 0xd0, 0xda, 0xda, 0xda, 0xe4, 0xe4, 0xe4, 0xee, 0xee, 0xee,
};
/*
* VT340 undocumented behavior regarding the color palette reported
* by Vertis Sidus(@vrtsds):
* it loads the first fifteen colors as 1 through 15, and loads the
* sixteenth color as 0.
*/
static const unsigned char pal_vt340_mono[] = {
/* 1 Gray-2 */ 13 * 255 / 100, 13 * 255 / 100, 13 * 255 / 100,
/* 2 Gray-4 */ 26 * 255 / 100, 26 * 255 / 100, 26 * 255 / 100,
/* 3 Gray-6 */ 40 * 255 / 100, 40 * 255 / 100, 40 * 255 / 100,
/* 4 Gray-1 */ 6 * 255 / 100, 6 * 255 / 100, 6 * 255 / 100,
/* 5 Gray-3 */ 20 * 255 / 100, 20 * 255 / 100, 20 * 255 / 100,
/* 6 Gray-5 */ 33 * 255 / 100, 33 * 255 / 100, 33 * 255 / 100,
/* 7 White 7 */ 46 * 255 / 100, 46 * 255 / 100, 46 * 255 / 100,
/* 8 Black 0 */ 0 * 255 / 100, 0 * 255 / 100, 0 * 255 / 100,
/* 9 Gray-2 */ 13 * 255 / 100, 13 * 255 / 100, 13 * 255 / 100,
/* 10 Gray-4 */ 26 * 255 / 100, 26 * 255 / 100, 26 * 255 / 100,
/* 11 Gray-6 */ 40 * 255 / 100, 40 * 255 / 100, 40 * 255 / 100,
/* 12 Gray-1 */ 6 * 255 / 100, 6 * 255 / 100, 6 * 255 / 100,
/* 13 Gray-3 */ 20 * 255 / 100, 20 * 255 / 100, 20 * 255 / 100,
/* 14 Gray-5 */ 33 * 255 / 100, 33 * 255 / 100, 33 * 255 / 100,
/* 15 White 7 */ 46 * 255 / 100, 46 * 255 / 100, 46 * 255 / 100,
/* 0 Black */ 0 * 255 / 100, 0 * 255 / 100, 0 * 255 / 100,
};
static const unsigned char pal_vt340_color[] = {
/* 1 Blue */ 20 * 255 / 100, 20 * 255 / 100, 80 * 255 / 100,
/* 2 Red */ 80 * 255 / 100, 13 * 255 / 100, 13 * 255 / 100,
/* 3 Green */ 20 * 255 / 100, 80 * 255 / 100, 20 * 255 / 100,
/* 4 Magenta */ 80 * 255 / 100, 20 * 255 / 100, 80 * 255 / 100,
/* 5 Cyan */ 20 * 255 / 100, 80 * 255 / 100, 80 * 255 / 100,
/* 6 Yellow */ 80 * 255 / 100, 80 * 255 / 100, 20 * 255 / 100,
/* 7 Gray 50% */ 53 * 255 / 100, 53 * 255 / 100, 53 * 255 / 100,
/* 8 Gray 25% */ 26 * 255 / 100, 26 * 255 / 100, 26 * 255 / 100,
/* 9 Blue* */ 33 * 255 / 100, 33 * 255 / 100, 60 * 255 / 100,
/* 10 Red* */ 60 * 255 / 100, 26 * 255 / 100, 26 * 255 / 100,
/* 11 Green* */ 33 * 255 / 100, 60 * 255 / 100, 33 * 255 / 100,
/* 12 Magenta* */ 60 * 255 / 100, 33 * 255 / 100, 60 * 255 / 100,
/* 13 Cyan* */ 33 * 255 / 100, 60 * 255 / 100, 60 * 255 / 100,
/* 14 Yellow* */ 60 * 255 / 100, 60 * 255 / 100, 33 * 255 / 100,
/* 15 Gray 75% */ 80 * 255 / 100, 80 * 255 / 100, 80 * 255 / 100,
/* 0 Black */ 0 * 255 / 100, 0 * 255 / 100, 0 * 255 / 100,
};
/* create dither context object */
SIXELAPI SIXELSTATUS
sixel_dither_new(
sixel_dither_t /* out */ **ppdither, /* dither object to be created */
int /* in */ ncolors, /* required colors */
sixel_allocator_t /* in */ *allocator) /* allocator, null if you use
default allocator */
{
SIXELSTATUS status = SIXEL_FALSE;
size_t headsize;
size_t datasize;
size_t wholesize;
int quality_mode;
if (ppdither == NULL) {
sixel_helper_set_additional_message(
"sixel_dither_new: ppdither is null.");
status = SIXEL_BAD_ARGUMENT;
goto end;
}
if (allocator == NULL) {
status = sixel_allocator_new(&allocator, NULL, NULL, NULL, NULL);
if (SIXEL_FAILED(status)) {
*ppdither = NULL;
goto end;
}
} else {
sixel_allocator_ref(allocator);
}
if (ncolors < 0) {
ncolors = SIXEL_PALETTE_MAX;
quality_mode = SIXEL_QUALITY_HIGHCOLOR;
} else {
if (ncolors > SIXEL_PALETTE_MAX) {
status = SIXEL_BAD_INPUT;
ncolors = SIXEL_PALETTE_MAX;
} else if (ncolors < 1) {
status = SIXEL_BAD_INPUT;
sixel_helper_set_additional_message(
"sixel_dither_new: palette colors must be more than 0");
goto end;
}
quality_mode = SIXEL_QUALITY_LOW;
}
headsize = sizeof(sixel_dither_t);
datasize = (size_t)(ncolors * 3);
wholesize = headsize + datasize;
*ppdither = (sixel_dither_t *)sixel_allocator_malloc(allocator, wholesize);
if (*ppdither == NULL) {
sixel_allocator_unref(allocator);
sixel_helper_set_additional_message(
"sixel_dither_new: sixel_allocator_malloc() failed.");
status = SIXEL_BAD_ALLOCATION;
goto end;
}
(*ppdither)->ref = 1;
(*ppdither)->palette = (unsigned char*)(*ppdither + 1);
(*ppdither)->cachetable = NULL;
(*ppdither)->reqcolors = ncolors;
(*ppdither)->ncolors = ncolors;
(*ppdither)->origcolors = (-1);
(*ppdither)->keycolor = (-1);
(*ppdither)->optimized = 0;
(*ppdither)->optimize_palette = 0;
(*ppdither)->complexion = 1;
(*ppdither)->bodyonly = 0;
(*ppdither)->method_for_largest = SIXEL_LARGE_NORM;
(*ppdither)->method_for_rep = SIXEL_REP_CENTER_BOX;
(*ppdither)->method_for_diffuse = SIXEL_DIFFUSE_FS;
(*ppdither)->quality_mode = quality_mode;
(*ppdither)->pixelformat = SIXEL_PIXELFORMAT_RGB888;
(*ppdither)->allocator = allocator;
status = SIXEL_OK;
end:
return status;
}
/* create dither context object (deprecated) */
SIXELAPI sixel_dither_t *
sixel_dither_create(
int /* in */ ncolors)
{
SIXELSTATUS status = SIXEL_FALSE;
sixel_dither_t *dither = NULL;
status = sixel_dither_new(&dither, ncolors, NULL);
if (SIXEL_FAILED(status)) {
goto end;
}
end:
return dither;
}
SIXELAPI void
sixel_dither_destroy(
sixel_dither_t /* in */ *dither)
{
sixel_allocator_t *allocator;
if (dither) {
allocator = dither->allocator;
sixel_allocator_free(allocator, dither->cachetable);
dither->cachetable = NULL;
sixel_allocator_free(allocator, dither);
sixel_allocator_unref(allocator);
}
}
SIXELAPI void
sixel_dither_ref(
sixel_dither_t /* in */ *dither)
{
/* TODO: be thread safe */
++dither->ref;
}
SIXELAPI void
sixel_dither_unref(
sixel_dither_t /* in */ *dither)
{
/* TODO: be thread safe */
if (dither != NULL && --dither->ref == 0) {
sixel_dither_destroy(dither);
}
}
SIXELAPI sixel_dither_t *
sixel_dither_get(
int /* in */ builtin_dither)
{
SIXELSTATUS status = SIXEL_FALSE;
unsigned char *palette;
int ncolors;
int keycolor;
sixel_dither_t *dither = NULL;
switch (builtin_dither) {
case SIXEL_BUILTIN_MONO_DARK:
ncolors = 2;
palette = (unsigned char *)pal_mono_dark;
keycolor = 0;
break;
case SIXEL_BUILTIN_MONO_LIGHT:
ncolors = 2;
palette = (unsigned char *)pal_mono_light;
keycolor = 0;
break;
case SIXEL_BUILTIN_XTERM16:
ncolors = 16;
palette = (unsigned char *)pal_xterm256;
keycolor = (-1);
break;
case SIXEL_BUILTIN_XTERM256:
ncolors = 256;
palette = (unsigned char *)pal_xterm256;
keycolor = (-1);
break;
case SIXEL_BUILTIN_VT340_MONO:
ncolors = 16;
palette = (unsigned char *)pal_vt340_mono;
keycolor = (-1);
break;
case SIXEL_BUILTIN_VT340_COLOR:
ncolors = 16;
palette = (unsigned char *)pal_vt340_color;
keycolor = (-1);
break;
case SIXEL_BUILTIN_G1:
ncolors = 2;
palette = (unsigned char *)pal_gray_1bit;
keycolor = (-1);
break;
case SIXEL_BUILTIN_G2:
ncolors = 4;
palette = (unsigned char *)pal_gray_2bit;
keycolor = (-1);
break;
case SIXEL_BUILTIN_G4:
ncolors = 16;
palette = (unsigned char *)pal_gray_4bit;
keycolor = (-1);
break;
case SIXEL_BUILTIN_G8:
ncolors = 256;
palette = (unsigned char *)pal_gray_8bit;
keycolor = (-1);
break;
default:
goto end;
}
status = sixel_dither_new(&dither, ncolors, NULL);
if (SIXEL_FAILED(status)) {
dither = NULL;
goto end;
}
dither->palette = palette;
dither->keycolor = keycolor;
dither->optimized = 1;
dither->optimize_palette = 0;
end:
return dither;
}
static void
sixel_dither_set_method_for_largest(
sixel_dither_t /* in */ *dither,
int /* in */ method_for_largest)
{
if (method_for_largest == SIXEL_LARGE_AUTO) {
method_for_largest = SIXEL_LARGE_NORM;
}
dither->method_for_largest = method_for_largest;
}
static void
sixel_dither_set_method_for_rep(
sixel_dither_t /* in */ *dither,
int /* in */ method_for_rep)
{
if (method_for_rep == SIXEL_REP_AUTO) {
method_for_rep = SIXEL_REP_CENTER_BOX;
}
dither->method_for_rep = method_for_rep;
}
static void
sixel_dither_set_quality_mode(
sixel_dither_t /* in */ *dither,
int /* in */ quality_mode)
{
if (quality_mode == SIXEL_QUALITY_AUTO) {
if (dither->ncolors <= 8) {
quality_mode = SIXEL_QUALITY_HIGH;
} else {
quality_mode = SIXEL_QUALITY_LOW;
}
}
dither->quality_mode = quality_mode;
}
SIXELAPI SIXELSTATUS
sixel_dither_initialize(
sixel_dither_t /* in */ *dither,
unsigned char /* in */ *data,
int /* in */ width,
int /* in */ height,
int /* in */ pixelformat,
int /* in */ method_for_largest,
int /* in */ method_for_rep,
int /* in */ quality_mode)
{
unsigned char *buf = NULL;
unsigned char *normalized_pixels = NULL;
unsigned char *input_pixels;
SIXELSTATUS status = SIXEL_FALSE;
if (dither == NULL) {
sixel_helper_set_additional_message(
"sixel_dither_new: dither is null.");
status = SIXEL_BAD_ARGUMENT;
goto end;
}
sixel_dither_ref(dither);
sixel_dither_set_pixelformat(dither, pixelformat);
switch (pixelformat) {
case SIXEL_PIXELFORMAT_RGB888:
input_pixels = data;
break;
default:
/* normalize pixelformat */
normalized_pixels
= (unsigned char *)sixel_allocator_malloc(dither->allocator, (size_t)(width * height * 3));
if (normalized_pixels == NULL) {
sixel_helper_set_additional_message(
"sixel_dither_initialize: sixel_allocator_malloc() failed.");
status = SIXEL_BAD_ALLOCATION;
goto end;
}
status = sixel_helper_normalize_pixelformat(
normalized_pixels,
&pixelformat,
data,
pixelformat,
width,
height);
if (SIXEL_FAILED(status)) {
goto end;
}
input_pixels = normalized_pixels;
break;
}
sixel_dither_set_method_for_largest(dither, method_for_largest);
sixel_dither_set_method_for_rep(dither, method_for_rep);
sixel_dither_set_quality_mode(dither, quality_mode);
status = sixel_quant_make_palette(&buf,
input_pixels,
(unsigned int)(width * height * 3),
SIXEL_PIXELFORMAT_RGB888,
(unsigned int)dither->reqcolors,
(unsigned int *)&dither->ncolors,
(unsigned int *)&dither->origcolors,
dither->method_for_largest,
dither->method_for_rep,
dither->quality_mode,
dither->allocator);
if (SIXEL_FAILED(status)) {
goto end;
}
memcpy(dither->palette, buf, (size_t)(dither->ncolors * 3));
dither->optimized = 1;
if (dither->origcolors <= dither->ncolors) {
dither->method_for_diffuse = SIXEL_DIFFUSE_NONE;
}
sixel_quant_free_palette(buf, dither->allocator);
status = SIXEL_OK;
end:
free(normalized_pixels);
sixel_dither_unref(dither);
return status;
}
/* set diffusion type, choose from enum methodForDiffuse */
SIXELAPI void
sixel_dither_set_diffusion_type(
sixel_dither_t /* in */ *dither,
int /* in */ method_for_diffuse)
{
if (method_for_diffuse == SIXEL_DIFFUSE_AUTO) {
if (dither->ncolors > 16) {
method_for_diffuse = SIXEL_DIFFUSE_FS;
} else {
method_for_diffuse = SIXEL_DIFFUSE_ATKINSON;
}
}
dither->method_for_diffuse = method_for_diffuse;
}
/* get number of palette colors */
SIXELAPI int
sixel_dither_get_num_of_palette_colors(
sixel_dither_t /* in */ *dither)
{
return dither->ncolors;
}
/* get number of histogram colors */
SIXELAPI int
sixel_dither_get_num_of_histogram_colors(
sixel_dither_t /* in */ *dither) /* dither context object */
{
return dither->origcolors;
}
/* typoed: remained for keeping compatibility */
SIXELAPI int
sixel_dither_get_num_of_histgram_colors(
sixel_dither_t /* in */ *dither) /* dither context object */
{
return sixel_dither_get_num_of_histogram_colors(dither);
}
/* get palette */
SIXELAPI unsigned char *
sixel_dither_get_palette(
sixel_dither_t /* in */ *dither) /* dither context object */
{
return dither->palette;
}
/* set palette */
SIXELAPI void
sixel_dither_set_palette(
sixel_dither_t /* in */ *dither, /* dither context object */
unsigned char /* in */ *palette)
{
memcpy(dither->palette, palette, (size_t)(dither->ncolors * 3));
}
/* set the factor of complexion color correcting */
SIXELAPI void
sixel_dither_set_complexion_score(
sixel_dither_t /* in */ *dither, /* dither context object */
int /* in */ score) /* complexion score (>= 1) */
{
dither->complexion = score;
}
/* set whether omitting palette difinition */
SIXELAPI void
sixel_dither_set_body_only(
sixel_dither_t /* in */ *dither, /* dither context object */
int /* in */ bodyonly) /* 0: output palette section
1: do not output palette section */
{
dither->bodyonly = bodyonly;
}
/* set whether optimize palette size */
SIXELAPI void
sixel_dither_set_optimize_palette(
sixel_dither_t /* in */ *dither, /* dither context object */
int /* in */ do_opt) /* 0: optimize palette size
1: don't optimize palette size */
{
dither->optimize_palette = do_opt;
}
/* set pixelformat */
SIXELAPI void
sixel_dither_set_pixelformat(
sixel_dither_t /* in */ *dither, /* dither context object */
int /* in */ pixelformat) /* one of enum pixelFormat */
{
dither->pixelformat = pixelformat;
}
/* set transparent */
SIXELAPI void
sixel_dither_set_transparent(
sixel_dither_t /* in */ *dither, /* dither context object */
int /* in */ transparent) /* transparent color index */
{
dither->keycolor = transparent;
}
/* set transparent */
SIXELAPI unsigned char *
sixel_dither_apply_palette(
sixel_dither_t /* in */ *dither,
unsigned char /* in */ *pixels,
int /* in */ width,
int /* in */ height)
{
SIXELSTATUS status = SIXEL_FALSE;
size_t bufsize;
unsigned char *dest = NULL;
int ncolors;
unsigned char *normalized_pixels = NULL;
unsigned char *input_pixels;
if (dither == NULL) {
sixel_helper_set_additional_message(
"sixel_dither_apply_palette: dither is null.");
status = SIXEL_BAD_ARGUMENT;
goto end;
}
sixel_dither_ref(dither);
bufsize = (size_t)(width * height) * sizeof(unsigned char);
dest = (unsigned char *)sixel_allocator_malloc(dither->allocator, bufsize);
if (dest == NULL) {
sixel_helper_set_additional_message(
"sixel_dither_new: sixel_allocator_malloc() failed.");
status = SIXEL_BAD_ALLOCATION;
goto end;
}
/* if quality_mode is full, do not use palette caching */
if (dither->quality_mode == SIXEL_QUALITY_FULL) {
dither->optimized = 0;
}
if (dither->cachetable == NULL && dither->optimized) {
if (dither->palette != pal_mono_dark && dither->palette != pal_mono_light) {
dither->cachetable = (unsigned short *)sixel_allocator_calloc(dither->allocator,
(size_t)(1 << 3 * 5),
sizeof(unsigned short));
if (dither->cachetable == NULL) {
sixel_helper_set_additional_message(
"sixel_dither_new: sixel_allocator_calloc() failed.");
status = SIXEL_BAD_ALLOCATION;
goto end;
}
}
}
if (dither->pixelformat != SIXEL_PIXELFORMAT_RGB888) {
/* normalize pixelformat */
normalized_pixels
= (unsigned char *)sixel_allocator_malloc(dither->allocator, (size_t)(width * height * 3));
if (normalized_pixels == NULL) {
sixel_helper_set_additional_message(
"sixel_dither_new: sixel_allocator_malloc() failed.");
status = SIXEL_BAD_ALLOCATION;
goto end;
}
status = sixel_helper_normalize_pixelformat(normalized_pixels,
&dither->pixelformat,
pixels, dither->pixelformat,
width, height);
if (SIXEL_FAILED(status)) {
goto end;
}
input_pixels = normalized_pixels;
} else {
input_pixels = pixels;
}
status = sixel_quant_apply_palette(dest,
input_pixels,
width, height, 3,
dither->palette,
dither->ncolors,
dither->method_for_diffuse,
dither->optimized,
dither->optimize_palette,
dither->complexion,
dither->cachetable,
&ncolors,
dither->allocator);
if (SIXEL_FAILED(status)) {
free(dest);
dest = NULL;
goto end;
}
dither->ncolors = ncolors;
end:
free(normalized_pixels);
sixel_dither_unref(dither);
return dest;
}
#if HAVE_TESTS
static int
test1(void)
{
sixel_dither_t *dither = NULL;
int nret = EXIT_FAILURE;
#if HAVE_DIAGNOSTIC_DEPRECATED_DECLARATIONS
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
dither = sixel_dither_create(0);
#if HAVE_DIAGNOSTIC_DEPRECATED_DECLARATIONS
# pragma GCC diagnostic pop
#endif
if (dither == NULL) {
goto error;
}
sixel_dither_ref(dither);
sixel_dither_unref(dither);
nret = EXIT_SUCCESS;
error:
sixel_dither_unref(dither);
return nret;
}
static int
test2(void)
{
sixel_dither_t *dither = NULL;
int colors;
int nret = EXIT_FAILURE;
#if HAVE_DIAGNOSTIC_DEPRECATED_DECLARATIONS
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wdeprecated-declarations"
#endif
dither = sixel_dither_create(INT_MAX);
#if HAVE_DIAGNOSTIC_DEPRECATED_DECLARATIONS
# pragma GCC diagnostic pop
#endif
if (dither == NULL) {
goto error;
}
sixel_dither_set_body_only(dither, 1);
colors = sixel_dither_get_num_of_histogram_colors(dither);
if (colors != -1) {
goto error;
}
nret = EXIT_SUCCESS;
error:
sixel_dither_unref(dither);
return nret;
}
SIXELAPI int
sixel_dither_tests_main(void)
{
int nret = EXIT_FAILURE;
size_t i;
typedef int (* testcase)(void);
static testcase const testcases[] = {
test1,
test2,
};
for (i = 0; i < sizeof(testcases) / sizeof(testcase); ++i) {
nret = testcases[i]();
if (nret != EXIT_SUCCESS) {
goto error;
}
}
nret = EXIT_SUCCESS;
error:
return nret;
}
#endif /* HAVE_TESTS */
/* emacs Local Variables: */
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/* EOF */