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/*
dither 16 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 "dither16Bit.h"
Dither16Bit::Dither16Bit(unsigned int redMask,
unsigned int greenMask,unsigned int blueMask) {
colorTableHighBit=new ColorTableHighBit(16,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();
}
Dither16Bit::~Dither16Bit() {
delete colorTableHighBit;
}
/*
*--------------------------------------------------------------
*
* Color16DitherImage --
*
* Converts image into 16 bit color.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void Dither16Bit::ditherImageColor16(unsigned char* lum,
unsigned char* cr,
unsigned char* cb,
unsigned char* out,
int rows,
int cols,
int offset) {
int L, CR, CB;
unsigned short *row1, *row2;
unsigned char *lum2;
int x, y;
int cr_r;
int cr_g;
int cb_g;
int cb_b;
int cols_2 = cols/2;
row1 = (unsigned short *)out;
row2=row1+cols_2+cols_2+offset; // start of second row
offset=2*offset+cols_2+cols_2;
lum2 = lum + cols_2 + cols_2;
for (y=0; y<rows; y+=2) {
for (x=0; x<cols_2; x++) {
int R, G, B;
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;
*row1++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
#ifdef 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];
}
#endif
L = L_tab[(int) *lum++];
R = L + cr_r;
G = L + cr_g + cb_g;
B = L + cb_b;
*row1++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
/*
* Now, do second row.
*/
#ifdef INTERPOLATE
if(y != rows - 2) {
CR = (CR + *(cr + cols_2 - 1)) >> 1;
CB = (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];
}
#endif
L = L_tab[(int) *lum2++];
R = L + cr_r;
G = L + cr_g + cb_g;
B = L + cb_b;
*row2++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
L = L_tab[(int) *lum2++];
R = L + cr_r;
G = L + cr_g + cb_g;
B = L + cb_b;
*row2++ = (r_2_pix[R] | g_2_pix[G] | b_2_pix[B]);
}
/*
* These values are at the start of the next line, (due
* to the ++'s above),but they need to be at the start
* of the line after that.
*/
lum += cols_2 + cols_2;
lum2 += cols_2 + cols_2;
row1 += offset;
row2 += offset;
}
}
/*
* Erik Corry's pixel doubling routines for 15/16/24/32 bit screens.
*/
/*
*--------------------------------------------------------------
*
* Twox2Color16DitherImage --
*
* Converts image into 16 bit color at double size.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/*
* In this function I make use of a nasty trick. The tables have the lower
* 16 bits replicated in the upper 16. This means I can write ints and get
* the horisontal doubling for free (almost).
*/
void Dither16Bit::ditherImageTwox2Color16(unsigned char* lum,
unsigned char* cr,
unsigned char* cb,
unsigned char* out,
int rows,
int cols,
int mod) {
int L, CR, CB;
unsigned int *row1 = (unsigned int *)out;
unsigned int *row2 = row1 + cols + mod/2;
unsigned int *row3 = row2 + cols + mod/2;
unsigned int *row4 = row3 + cols + mod/2;
unsigned char *lum2;
int x, y;
int cr_r;
int cr_g;
int cb_g;
int cb_b;
int cols_2 = cols/2;
lum2 = lum + cols_2 + cols_2;
for (y=0; y<rows; y+=2) {
for (x=0; x<cols_2; x++) {
int R, G, B;
int 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;
row1++;
row2[0] = t;
row2++;
// 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
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;
row1++;
row2[0] = t;
row2++;
/*
* Now, do second row.
*/
// INTERPOLATE
if(y != rows - 2) {
CR = (CR + *(cr + cols_2 - 1)) >> 1;
CB = (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
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;
row3++;
row4[0] = t;
row4++;
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;
row3++;
row4[0] = t;
row4++;
}
lum += cols_2 + cols_2;
lum2 += cols_2 + cols_2;
row1 += 6 * cols_2 + 2*mod;
row3 += 6 * cols_2 + 2*mod;
row2 += 6 * cols_2 + 2*mod;
row4 += 6 * cols_2 + 2*mod;
}
}
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