387 lines
13 KiB
C
387 lines
13 KiB
C
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/*
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* Copyright (c) 1990 James Ashton - Sydney University
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* Copyright (c) 2012 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* X-Face common data and utilities definition.
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*/
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#include "libavutil/avassert.h"
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#include "xface.h"
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void ff_big_add(BigInt *b, uint8_t a)
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{
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int i;
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uint8_t *w;
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uint16_t c;
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a &= XFACE_WORDMASK;
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if (a == 0)
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return;
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w = b->words;
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c = a;
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for (i = 0; i < b->nb_words && c; i++) {
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c += *w;
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*w++ = c & XFACE_WORDMASK;
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c >>= XFACE_BITSPERWORD;
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}
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if (i == b->nb_words && c) {
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av_assert0(b->nb_words < XFACE_MAX_WORDS);
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b->nb_words++;
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*w = c & XFACE_WORDMASK;
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}
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}
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void ff_big_div(BigInt *b, uint8_t a, uint8_t *r)
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{
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int i;
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uint8_t *w;
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uint16_t c, d;
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a &= XFACE_WORDMASK;
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if (a == 1 || b->nb_words == 0) {
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*r = 0;
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return;
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}
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/* treat this as a == WORDCARRY and just shift everything right a WORD */
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if (a == 0) {
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i = --b->nb_words;
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w = b->words;
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*r = *w;
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while (i--) {
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*w = *(w + 1);
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w++;
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}
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*w = 0;
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return;
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}
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i = b->nb_words;
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w = b->words + i;
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c = 0;
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while (i--) {
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c <<= XFACE_BITSPERWORD;
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c += *--w;
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d = c / (uint16_t)a;
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c = c % (uint16_t)a;
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*w = d & XFACE_WORDMASK;
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}
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*r = c;
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if (b->words[b->nb_words - 1] == 0)
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b->nb_words--;
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}
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void ff_big_mul(BigInt *b, uint8_t a)
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{
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int i;
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uint8_t *w;
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uint16_t c;
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a &= XFACE_WORDMASK;
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if (a == 1 || b->nb_words == 0)
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return;
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if (a == 0) {
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/* treat this as a == WORDCARRY and just shift everything left a WORD */
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av_assert0(b->nb_words < XFACE_MAX_WORDS);
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i = b->nb_words++;
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w = b->words + i;
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while (i--) {
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*w = *(w - 1);
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w--;
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}
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*w = 0;
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return;
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}
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i = b->nb_words;
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w = b->words;
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c = 0;
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while (i--) {
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c += (uint16_t)*w * (uint16_t)a;
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*(w++) = c & XFACE_WORDMASK;
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c >>= XFACE_BITSPERWORD;
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}
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if (c) {
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av_assert0(b->nb_words < XFACE_MAX_WORDS);
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b->nb_words++;
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*w = c & XFACE_WORDMASK;
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}
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}
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const ProbRange ff_xface_probranges_per_level[4][3] = {
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// black grey white
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{ { 1, 255}, {251, 0}, { 4, 251} }, /* Top of tree almost always grey */
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{ { 1, 255}, {200, 0}, { 55, 200} },
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{ { 33, 223}, {159, 0}, { 64, 159} },
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{ {131, 0}, { 0, 0}, {125, 131} }, /* Grey disallowed at bottom */
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};
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const ProbRange ff_xface_probranges_2x2[16] = {
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{ 0, 0}, {38, 0}, {38, 38}, {13, 152},
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{38, 76}, {13, 165}, {13, 178}, { 6, 230},
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{38, 114}, {13, 191}, {13, 204}, { 6, 236},
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{13, 217}, { 6, 242}, { 5, 248}, { 3, 253},
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};
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/*
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* The "guess the next pixel" tables follow. Normally there are 12
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* neighbour pixels used to give 1<<12 cases as we get closer to the
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* upper left corner lesser numbers of neighbours are available.
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*
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* Each byte in the tables represents 8 boolean values starting from
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* the most significant bit.
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*/
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static const uint8_t g_00[] = {
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0x00, 0x00, 0x01, 0x01, 0x00, 0x00, 0xe3, 0xdf, 0x05, 0x17,
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0x05, 0x0f, 0x00, 0x1b, 0x0f, 0xdf, 0x00, 0x04, 0x00, 0x00,
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0x0d, 0x0f, 0x03, 0x7f, 0x00, 0x00, 0x00, 0x01, 0x00, 0x1d,
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0x45, 0x2f, 0x00, 0x00, 0x00, 0x0d, 0x00, 0x0a, 0xff, 0xff,
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0x00, 0x04, 0x00, 0x05, 0x01, 0x3f, 0xcf, 0xff, 0x10, 0x01,
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0x80, 0xc9, 0x0f, 0x0f, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00,
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0x1b, 0x1f, 0xff, 0xff, 0x4f, 0x54, 0x07, 0x1f, 0x57, 0x47,
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0xd7, 0x3d, 0xff, 0xff, 0x5f, 0x1f, 0x7f, 0xff, 0x7f, 0x7f,
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0x05, 0x0f, 0x01, 0x0f, 0x0f, 0x5f, 0x9b, 0xdf, 0x7f, 0xff,
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0x5f, 0x1d, 0x5f, 0xff, 0x0f, 0x1f, 0x0f, 0x5f, 0x03, 0x1f,
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0x4f, 0x5f, 0xf7, 0x7f, 0x7f, 0xff, 0x0d, 0x0f, 0xfb, 0xff,
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0xf7, 0xbf, 0x0f, 0x4f, 0xd7, 0x3f, 0x4f, 0x7f, 0xff, 0xff,
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0x67, 0xbf, 0x56, 0x25, 0x1f, 0x7f, 0x9f, 0xff, 0x00, 0x00,
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0x00, 0x05, 0x5f, 0x7f, 0x01, 0xdf, 0x14, 0x00, 0x05, 0x0f,
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0x07, 0xa2, 0x09, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x0f, 0x5f,
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0x18, 0xd7, 0x94, 0x71, 0x00, 0x05, 0x1f, 0xb7, 0x0c, 0x07,
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0x0f, 0x0f, 0x00, 0x0f, 0x0f, 0x1f, 0x84, 0x8f, 0x05, 0x15,
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0x05, 0x0f, 0x4f, 0xff, 0x87, 0xdf, 0x05, 0x01, 0x10, 0x00,
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0x0f, 0x0f, 0x00, 0x08, 0x05, 0x04, 0x04, 0x01, 0x4f, 0xff,
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0x9f, 0x8f, 0x4a, 0x40, 0x5f, 0x5f, 0xff, 0xfe, 0xdf, 0xff,
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0x7f, 0xf7, 0xff, 0x7f, 0xff, 0xff, 0x7b, 0xff, 0x0f, 0xfd,
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0xd7, 0x5f, 0x4f, 0x7f, 0x7f, 0xdf, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x77, 0xdf, 0x7f, 0x4f, 0xef, 0xff, 0xff, 0x77, 0xff,
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0xff, 0xff, 0x6f, 0xff, 0x0f, 0x4f, 0xff, 0xff, 0x9d, 0xff,
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0x0f, 0xef, 0xff, 0xdf, 0x6f, 0xff, 0xff, 0xff, 0x4f, 0xff,
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0xcd, 0x0f, 0x4f, 0xff, 0xff, 0xdf, 0x00, 0x00, 0x00, 0x0b,
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0x05, 0x02, 0x02, 0x0f, 0x04, 0x00, 0x00, 0x0c, 0x01, 0x06,
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0x00, 0x0f, 0x20, 0x03, 0x00, 0x00, 0x05, 0x0f, 0x40, 0x08,
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0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x0c, 0x0f, 0x01, 0x00,
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0x80, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x14, 0x01, 0x05,
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0x01, 0x15, 0xaf, 0x0f, 0x00, 0x01, 0x10, 0x00, 0x08, 0x00,
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0x46, 0x0c, 0x20, 0x00, 0x88, 0x00, 0x0f, 0x15, 0xff, 0xdf,
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0x02, 0x00, 0x00, 0x0f, 0x7f, 0x5f, 0xdb, 0xff, 0x4f, 0x3e,
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0x05, 0x0f, 0x7f, 0xf7, 0x95, 0x4f, 0x0d, 0x0f, 0x01, 0x0f,
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0x4f, 0x5f, 0x9f, 0xdf, 0x25, 0x0e, 0x0d, 0x0d, 0x4f, 0x7f,
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0x8f, 0x0f, 0x0f, 0xfa, 0x04, 0x4f, 0x4f, 0xff, 0xf7, 0x77,
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0x47, 0xed, 0x05, 0x0f, 0xff, 0xff, 0xdf, 0xff, 0x4f, 0x6f,
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0xd8, 0x5f, 0x0f, 0x7f, 0xdf, 0x5f, 0x07, 0x0f, 0x94, 0x0d,
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0x1f, 0xff, 0xff, 0xff, 0x00, 0x02, 0x00, 0x03, 0x46, 0x57,
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0x01, 0x0d, 0x01, 0x08, 0x01, 0x0f, 0x47, 0x6c, 0x0d, 0x0f,
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0x02, 0x00, 0x00, 0x00, 0x0b, 0x4f, 0x00, 0x08, 0x05, 0x00,
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0x95, 0x01, 0x0f, 0x7f, 0x0c, 0x0f, 0x01, 0x0e, 0x00, 0x00,
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0x0f, 0x41, 0x00, 0x00, 0x04, 0x24, 0x0d, 0x0f, 0x0f, 0x7f,
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0xcf, 0xdf, 0x00, 0x00, 0x00, 0x00, 0x04, 0x40, 0x00, 0x00,
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0x06, 0x26, 0xcf, 0x05, 0xcf, 0x7f, 0xdf, 0xdf, 0x00, 0x00,
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0x17, 0x5f, 0xff, 0xfd, 0xff, 0xff, 0x46, 0x09, 0x4f, 0x5f,
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0x7f, 0xfd, 0xdf, 0xff, 0x0a, 0x88, 0xa7, 0x7f, 0x7f, 0xff,
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0xff, 0xff, 0x0f, 0x04, 0xdf, 0x7f, 0x4f, 0xff, 0x9f, 0xff,
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0x0e, 0xe6, 0xdf, 0xff, 0x7f, 0xff, 0xff, 0xff, 0x0f, 0xec,
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0x8f, 0x4f, 0x7f, 0xff, 0xdf, 0xff, 0x0f, 0xcf, 0xdf, 0xff,
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0x6f, 0x7f, 0xff, 0xff, 0x03, 0x0c, 0x9d, 0x0f, 0x7f, 0xff,
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0xff, 0xff,
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};
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static const uint8_t g_01[] = {
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0x37, 0x73, 0x00, 0x19, 0x57, 0x7f, 0xf5, 0xfb, 0x70, 0x33,
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0xf0, 0xf9, 0x7f, 0xff, 0xff, 0xff,
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};
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static const uint8_t g_02[] = {
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0x50,
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};
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static const uint8_t g_10[] = {
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0x00, 0x00, 0x00, 0x00, 0x50, 0x00, 0xf3, 0x5f, 0x84, 0x04,
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0x17, 0x9f, 0x04, 0x23, 0x05, 0xff, 0x00, 0x00, 0x00, 0x02,
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0x03, 0x03, 0x33, 0xd7, 0x05, 0x03, 0x5f, 0x3f, 0x17, 0x33,
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0xff, 0xff, 0x00, 0x80, 0x02, 0x04, 0x12, 0x00, 0x11, 0x57,
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0x05, 0x25, 0x05, 0x03, 0x35, 0xbf, 0x9f, 0xff, 0x07, 0x6f,
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0x20, 0x40, 0x17, 0x06, 0xfa, 0xe8, 0x01, 0x07, 0x1f, 0x9f,
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0x1f, 0xff, 0xff, 0xff,
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};
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static const uint8_t g_20[] = {
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0x04, 0x00, 0x01, 0x01, 0x43, 0x2e, 0xff, 0x3f,
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};
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static const uint8_t g_30[] = {
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0x11, 0x11, 0x11, 0x11, 0x51, 0x11, 0x13, 0x11, 0x11, 0x11,
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0x13, 0x11, 0x11, 0x11, 0x33, 0x11, 0x13, 0x11, 0x13, 0x13,
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0x13, 0x13, 0x31, 0x31, 0x11, 0x01, 0x11, 0x11, 0x71, 0x11,
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0x11, 0x75,
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};
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static const uint8_t g_40[] = {
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0x00, 0x0f, 0x00, 0x09, 0x00, 0x0d, 0x00, 0x0d, 0x00, 0x0f,
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0x00, 0x4e, 0xe4, 0x0d, 0x10, 0x0f, 0x00, 0x0f, 0x44, 0x4f,
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0x00, 0x1e, 0x0f, 0x0f, 0xae, 0xaf, 0x45, 0x7f, 0xef, 0xff,
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0x0f, 0xff, 0x00, 0x09, 0x01, 0x11, 0x00, 0x01, 0x1c, 0xdd,
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0x00, 0x15, 0x00, 0xff, 0x00, 0x10, 0x00, 0xfd, 0x00, 0x0f,
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0x4f, 0x5f, 0x3d, 0xff, 0xff, 0xff, 0x4f, 0xff, 0x1c, 0xff,
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0xdf, 0xff, 0x8f, 0xff, 0x00, 0x0d, 0x00, 0x00, 0x00, 0x15,
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0x01, 0x07, 0x00, 0x01, 0x02, 0x1f, 0x01, 0x11, 0x05, 0x7f,
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0x00, 0x1f, 0x41, 0x57, 0x1f, 0xff, 0x05, 0x77, 0x0d, 0x5f,
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0x4d, 0xff, 0x4f, 0xff, 0x0f, 0xff, 0x00, 0x00, 0x02, 0x05,
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0x00, 0x11, 0x05, 0x7d, 0x10, 0x15, 0x2f, 0xff, 0x40, 0x50,
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0x0d, 0xfd, 0x04, 0x0f, 0x07, 0x1f, 0x07, 0x7f, 0x0f, 0xbf,
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0x0d, 0x7f, 0x0f, 0xff, 0x4d, 0x7d, 0x0f, 0xff,
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};
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static const uint8_t g_11[] = {
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0x01, 0x13, 0x03, 0x7f,
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};
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static const uint8_t g_21[] = {
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0x17,
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};
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static const uint8_t g_31[] = {
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0x55, 0x57, 0x57, 0x7f,
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};
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||
|
|
|
||
|
|
static const uint8_t g_41[] = {
|
||
|
|
0x01, 0x01, 0x01, 0x1f, 0x03, 0x1f, 0x3f, 0xff,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t g_12[] = {
|
||
|
|
0x40,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t g_22[] = {
|
||
|
|
0x00,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t g_32[] = {
|
||
|
|
0x10,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const uint8_t g_42[] = {
|
||
|
|
0x10,
|
||
|
|
};
|
||
|
|
|
||
|
|
void ff_xface_generate_face(uint8_t *dst, uint8_t * const src)
|
||
|
|
{
|
||
|
|
int h, i, j, k, l, m;
|
||
|
|
|
||
|
|
for (j = 0; j < XFACE_HEIGHT; j++) {
|
||
|
|
for (i = 0; i < XFACE_WIDTH; i++) {
|
||
|
|
h = i + j * XFACE_WIDTH;
|
||
|
|
k = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
Compute k, encoding the bits *before* the current one, contained in the
|
||
|
|
image buffer. That is, given the grid:
|
||
|
|
|
||
|
|
l i
|
||
|
|
| |
|
||
|
|
v v
|
||
|
|
+--+--+--+--+--+
|
||
|
|
m -> | 1| 2| 3| 4| 5|
|
||
|
|
+--+--+--+--+--+
|
||
|
|
| 6| 7| 8| 9|10|
|
||
|
|
+--+--+--+--+--+
|
||
|
|
j -> |11|12| *| | |
|
||
|
|
+--+--+--+--+--+
|
||
|
|
|
||
|
|
the value k for the pixel marked as "*" will contain the bit encoding of
|
||
|
|
the values in the matrix marked from "1" to "12". In case the pixel is
|
||
|
|
near the border of the grid, the number of values contained within the
|
||
|
|
grid will be lesser than 12.
|
||
|
|
*/
|
||
|
|
|
||
|
|
for (l = i - 2; l <= i + 2; l++) {
|
||
|
|
for (m = j - 2; m <= j; m++) {
|
||
|
|
if (l <= 0 || l >= i && m == j)
|
||
|
|
continue;
|
||
|
|
if (l <= XFACE_WIDTH && m > 0)
|
||
|
|
k = 2*k + src[l + m * XFACE_WIDTH];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Use the guess for the given position and the computed value of k.
|
||
|
|
|
||
|
|
The following table shows the number of digits in k, depending on
|
||
|
|
the position of the pixel, and shows the corresponding guess table
|
||
|
|
to use:
|
||
|
|
|
||
|
|
i=1 i=2 i=3 i=w-1 i=w
|
||
|
|
+----+----+----+ ... +----+----+
|
||
|
|
j=1 | 0 | 1 | 2 | | 2 | 2 |
|
||
|
|
|g22 |g12 |g02 | |g42 |g32 |
|
||
|
|
+----+----+----+ ... +----+----+
|
||
|
|
j=2 | 3 | 5 | 7 | | 6 | 5 |
|
||
|
|
|g21 |g11 |g01 | |g41 |g31 |
|
||
|
|
+----+----+----+ ... +----+----+
|
||
|
|
j=3 | 5 | 9 | 12 | | 10 | 8 |
|
||
|
|
|g20 |g10 |g00 | |g40 |g30 |
|
||
|
|
+----+----+----+ ... +----+----+
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define GEN(table) dst[h] ^= (table[k>>3]>>(7-(k&7)))&1
|
||
|
|
|
||
|
|
switch (i) {
|
||
|
|
case 1:
|
||
|
|
switch (j) {
|
||
|
|
case 1: GEN(g_22); break;
|
||
|
|
case 2: GEN(g_21); break;
|
||
|
|
default: GEN(g_20); break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
switch (j) {
|
||
|
|
case 1: GEN(g_12); break;
|
||
|
|
case 2: GEN(g_11); break;
|
||
|
|
default: GEN(g_10); break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case XFACE_WIDTH - 1:
|
||
|
|
switch (j) {
|
||
|
|
case 1: GEN(g_42); break;
|
||
|
|
case 2: GEN(g_41); break;
|
||
|
|
default: GEN(g_40); break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case XFACE_WIDTH:
|
||
|
|
switch (j) {
|
||
|
|
case 1: GEN(g_32); break;
|
||
|
|
case 2: GEN(g_31); break;
|
||
|
|
default: GEN(g_30); break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
switch (j) {
|
||
|
|
case 1: GEN(g_02); break;
|
||
|
|
case 2: GEN(g_01); break;
|
||
|
|
default: GEN(g_00); break;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|