At the moment it's still incomplete, developement is continuing in the
wiki page ( http://strites.altervista.org/wiki3/doku.php?id=generator )
Todo: possible other variants of rgb
give a sense to [inv_table, srcRange, brightness, contrast, saturation]
arguments, which aren't actually used and I have no idea of how to use them.
Pro: the first 19 lines ^^'
I need someone to test this, to find possible bugs (seems flu returned
to me and I can't guarantee that things I wrote aren't broken ^^')
--
Keiji Costantini
/*
* Copyright (C) 2001-2003 Michael Niedermayer <[EMAIL PROTECTED]>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <math.h>
#include <stdint.h>
#include <stdlib.h>
#include "swscale_internal.h"
#define byteclamp(j) do { if (j < 0) j = 0;else if (j > 255) j = 255; } while (0)
void gentable32(int/*?*/ v, uint32_t *r , uint32_t *g1, uint32_t *g2 , uint32_t *b)
{
int i;
int32_t tr, tg1, tg2, tb;
tg2 = -((v-128)*71414 / 5^5 ) / 2^5;
byteclamp(tg2);
for (i=0;i<255;i++)
{
tr = i + ((v-128)* 1402 / 5^3 ) / 2^3;
tg1 = i - ((v-128)*34414 / 5^5 ) / 2^5;
tb = i + ((v-128)*1772 / 5^3 ) / 2^3;
byteclamp(tr);
byteclamp(tb);
if ((tg1 + tg2) < 0)
tg1 = -(tg2);
else if ((tg1 + tg2) > 255)
tg1 = 255 - tg2;
r[i] = tr << 16;
g1[i] = tg1 << 8;
b[i] = tb;
}
*g2 = tg2 << 8;
}
/**
* rgb565
*/
void gentable16(int/*?*/ v, uint16_t *r , uint16_t *g1, uint16_t *g2 , uint16_t *b)
{
int i;
int32_t tr, tg1, tg2, tb;
tg2 = -((v-128)*71414 / 5^5 ) / 2^5;
byteclamp(tg2);
for (i=0;i<255;i++)
{
tr = i + ((v-128)* 1402 / 5^3 ) / 2^3;
tg1 = i - ((v-128)*34414 / 5^5 ) / 2^5;
tb = i + ((v-128)*1772 / 5^3 ) / 2^3;
byteclamp(tr);
byteclamp(tb);
if ((tg1 + tg2) < 0)
tg1 = -(tg2);
else if ((tg1 + tg2) > 255)
tg1 = 255 - tg2;
tr = tr >> 3;
tg1 = tg1 >> 2;
tb = tb >> 3;
*r = tr << 11;
*g1 = tg1 << 5;
*b = tb;
}
tg2 = tg2 >> 2;
*g2 = tg2 << 5;
}
/**
* rgb24
*/
void gentable24(int/*?*/ v, uint8_t *r , uint8_t *g1, uint8_t *g2 , uint8_t *b)
{
int i;
int32_t tr, tg1, tg2, tb;
tg2 = -((v-128)*71414 / 5^5 ) / 2^5;
byteclamp(tg2);
for (i=0;i<255;i++)
{
tr = i + ((v-128)* 1402 / 5^3 ) / 2^3;
tg1 = i - ((v-128)*34414 / 5^5 ) / 2^5;
tb = i + ((v-128)*1772 / 5^3 ) / 2^3;
byteclamp(tr);
byteclamp(tb);
if ((tg1 + tg2) < 0)
tg1 = -(tg2);
else if ((tg1 + tg2) > 255)
tg1 = 255 - tg2;
r[i] = tr;
g1[i] = tg1;
b[i] = tb;
}
*g2 = tg2;
}
/**
* the infamus generator
*
* TODO: give a sense to inv_table, srcRange, brightness, contrast, saturation arguments (unused atm)
*/
void new_yuv2rgb_c_init_tables(SwsContext *c, inv_table, srcRange, brightness, contrast, saturation)
{
int sizeDstPixel=fmt_depth(c->dstFormat);
int y, u, v, h;
if (sizeDstPixel == 32)
{
uint32_t *the_table = malloc((sizeof(uint32_t)*256*256)*3);
uint32_t *r, *g1, *g2, *b;
for (h=0; h<256;h++)
{
c->table_rV[h]= the_table[h];
c->table_gU[h]= the_table[256+h];
c->table_bU[h]= the_table[256*2+h];
}
for (u=0;u<256;u++)
{
r =&c->table_rV[u];
g1=&c->table_gU[u];
b =&c->table_bU[u];
gentable32(u,r,g1,g2,b);
c->table_gV[u]=g2;
}
} else if (sizeDstPixel == 16)
{
uint16_t *the_table = malloc((sizeof(uint16_t)*256*256)*3);
uint16_t *r, *g1, *g2, *b;
for (h=0; h<256;h++)
{
c->table_rV[h]= the_table[h];
c->table_gU[h]= the_table[256+h];
c->table_bU[h]= the_table[256*2+h];
}
for (u=0;u<256;u++)
{
r =&c->table_rV[u];
g1=&c->table_gU[u];
b =&c->table_bU[u];
gentable16(u,r,g1,g2,b);
c->table_gV[u]=g2;
}
} else if (sizeDstPixel == 24)
{
uint8_t *the_table = malloc((sizeof(uint8_t)*256*256)*3);
uint8_t *r, *g1, *g2, *b;
for (h=0; h<256;h++)
{
c->table_rV[h]= the_table[h];
c->table_gU[h]= the_table[256+h];
c->table_bU[h]= the_table[256*2+h];
}
for (u=0;u<256;u++)
{
r =&c->table_rV[u];
g1=&c->table_gU[u];
b =&c->table_bU[u];
gentable24(u,r,g1,g2,b);
c->table_gV[u]=g2;
}
}
}
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