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/*
dither 32 bit depth yuv images
Copyright (C) 2000 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "dither32Bit.h"
#define doRow(row,Lum) *row++=(local_r_2_pix[Lum] | \
local_g_2_pix[Lum] | local_b_2_pix[Lum])
Dither32Bit::Dither32Bit(unsigned int redMask,
unsigned int greenMask,unsigned int blueMask) {
colorTableHighBit=new ColorTableHighBit(32,redMask,greenMask,blueMask);
L_tab=colorTableHighBit->getL_tab();
Cr_r_tab=colorTableHighBit->getCr_r_tab();
Cr_g_tab=colorTableHighBit->getCr_g_tab();
Cb_g_tab=colorTableHighBit->getCb_g_tab();
Cb_b_tab=colorTableHighBit->getCb_b_tab();
r_2_pix=colorTableHighBit->getr_2_pix();
g_2_pix=colorTableHighBit->getg_2_pix();
b_2_pix=colorTableHighBit->getb_2_pix();
}
Dither32Bit::~Dither32Bit() {
delete colorTableHighBit;
}
void Dither32Bit::ditherImageColor32(unsigned char* lum,
unsigned char* cr,
unsigned char* cb,
unsigned char* out,
int rows,
int cols,
int mod) {
int L;
int n;
int rowWork;
int colWork;
unsigned int *row1, *row2;
unsigned char *lum2;
PIXVAL* local_r_2_pix;
PIXVAL* local_g_2_pix;
PIXVAL* local_b_2_pix;
row1 = (unsigned int *)out;
row2 = row1+cols+mod;
lum2 = lum+cols;
// because the width/height are a multiply of a macroblocksize
// cols/rows always are even
colWork=cols>>1;
rowWork=rows>>1;
mod=cols+2*mod;
while(rowWork--) {
n=colWork;
while(n--) {
local_r_2_pix=r_2_pix+Cr_r_tab[*cr];
local_g_2_pix=g_2_pix+Cr_g_tab[*cr++] + Cb_g_tab[*cb];
local_b_2_pix=b_2_pix+Cb_b_tab[*cb++];
L = L_tab[*lum++];
doRow(row1,L);
L = L_tab[*lum++];
doRow(row1,L);
L = L_tab [*lum2++];
doRow(row2,L);
L = L_tab [*lum2++];
doRow(row2,L);
}
row2 += mod;
lum += cols;
lum2 += cols;
row1 += mod;
}
}
/*
*--------------------------------------------------------------
*
* Twox2Color32 --
*
* Converts image into 24/32 bit color.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void Dither32Bit::ditherImageTwox2Color32(unsigned char* lum,
unsigned char* cr,
unsigned char* cb,
unsigned char* out,
int rows,
int cols,
int mod) {
int L, CR, CB;
unsigned PIXVAL *row1 = (unsigned PIXVAL *)out;
unsigned PIXVAL *row2 = row1 + cols * ONE_TWO + mod;
unsigned PIXVAL *row3 = row2 + cols * ONE_TWO + mod;
unsigned PIXVAL *row4 = row3 + cols * ONE_TWO + mod;
unsigned char *lum2;
int x, y;
int cr_r;
int cr_g;
int cb_g;
int cb_b;
int cols_2 = cols/2;
int loffset = ONE_TWO * 6 *cols_2 + 4*mod ;
lum2 = lum + cols_2 + cols_2;
for (y=0; y<rows; y+=2) {
for (x=0; x<cols_2; x++) {
int R, G, B;
PIXVAL t;
CR = *cr++;
CB = *cb++;
cr_r = Cr_r_tab[CR];
cr_g = Cr_g_tab[CR];
cb_g = Cb_g_tab[CB];
cb_b = Cb_b_tab[CB];
L = L_tab[ (int) *lum++];
R = L + cr_r;
G = L + cr_g + cb_g;
B = L + cb_b;
t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
row1[0] = t;
row2[0] = t;
#ifndef SIXTYFOUR_BIT
row1[1] = t;
row2[1] = t;
#endif
row1 += ONE_TWO;
row2 += ONE_TWO;
/* INTERPOLATE is now standard */
// INTERPOLATE
if(x != cols_2 - 1) {
CR = (CR + *cr) >> 1;
CB = (CB + *cb) >> 1;
cr_r = Cr_r_tab[CR];
cr_g = Cr_g_tab[CR];
cb_g = Cb_g_tab[CB];
cb_b = Cb_b_tab[CB];
}
// end
/* end INTERPOLATE */
L = L_tab[ (int) *lum++];
R = L + cr_r;
G = L + cr_g + cb_g;
B = L + cb_b;
t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
row1[0] = t;
row2[0] = t;
#ifndef SIXTYFOUR_BIT
row1[1] = t;
row2[1] = t;
#endif
row1 += ONE_TWO;
row2 += ONE_TWO;
/*
* Now, do second row.
*/
/* INTERPOLATE is now standard */
// INTERPOLATE
if(y != rows - 2) {
CR = (unsigned int) (CR + *(cr + cols_2 - 1)) >> 1;
CB = (unsigned int) (CB + *(cb + cols_2 - 1)) >> 1;
cr_r = Cr_r_tab[CR];
cr_g = Cr_g_tab[CR];
cb_g = Cb_g_tab[CB];
cb_b = Cb_b_tab[CB];
}
// end
/* endif */
L = L_tab[ (int) *lum2++];
R = L + cr_r;
G = L + cr_g + cb_g;
B = L + cb_b;
t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
row3[0] = t;
row4[0] = t;
#ifndef SIXTYFOUR_BIT
row3[1] = t;
row4[1] = t;
#endif
row3 += ONE_TWO;
row4 += ONE_TWO;
L = L_tab[(int) *lum2++];
R = L + cr_r;
G = L + cr_g + cb_g;
B = L + cb_b;
t = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
row3[0] = t;
row4[0] = t;
#ifndef SIXTYFOUR_BIT
row3[1] = t;
row4[1] = t;
#endif
row3 += ONE_TWO;
row4 += ONE_TWO;
}
lum += cols_2 + cols_2;
lum2 += cols_2 + cols_2;
row1 += loffset;
row3 += loffset;
row2 += loffset;
row4 += loffset;
}
}
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