Files
glide/swlibs/texus/lib/quantize.c
2000-10-03 18:31:53 +00:00

687 lines
23 KiB
C

/*
** THIS SOFTWARE IS SUBJECT TO COPYRIGHT PROTECTION AND IS OFFERED ONLY
** PURSUANT TO THE 3DFX GLIDE GENERAL PUBLIC LICENSE. THERE IS NO RIGHT
** TO USE THE GLIDE TRADEMARK WITHOUT PRIOR WRITTEN PERMISSION OF 3DFX
** INTERACTIVE, INC. A COPY OF THIS LICENSE MAY BE OBTAINED FROM THE
** DISTRIBUTOR OR BY CONTACTING 3DFX INTERACTIVE INC(info@3dfx.com).
** THIS PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
** EXPRESSED OR IMPLIED. SEE THE 3DFX GLIDE GENERAL PUBLIC LICENSE FOR A
** FULL TEXT OF THE NON-WARRANTY PROVISIONS.
**
** USE, DUPLICATION OR DISCLOSURE BY THE GOVERNMENT IS SUBJECT TO
** RESTRICTIONS AS SET FORTH IN SUBDIVISION (C)(1)(II) OF THE RIGHTS IN
** TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE AT DFARS 252.227-7013,
** AND/OR IN SIMILAR OR SUCCESSOR CLAUSES IN THE FAR, DOD OR NASA FAR
** SUPPLEMENT. UNPUBLISHED RIGHTS RESERVED UNDER THE COPYRIGHT LAWS OF
** THE UNITED STATES.
**
** COPYRIGHT 3DFX INTERACTIVE, INC. 1999, ALL RIGHTS RESERVED
**
** $Revision$
** $Date$
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "texusint.h"
static int
dithmat[4][4] = { { 0, 8, 2, 10 },
{ 12, 4, 14, 6 },
{ 3, 11, 1, 9 },
{ 15, 7, 13, 5 }};
// for error diffusion.
static int errR[MAX_TEXWIDTH], errG[MAX_TEXWIDTH], errB[MAX_TEXWIDTH];
static int
_txPixQuantize_RGB332( unsigned long argb, int x, int y, int w)
{
return (
(((argb>>16) & 0xE0) |
((argb>>11) & 0x1C) |
((argb>> 6) & 0x03) ) );
}
static int
_txPixQuantize_RGB332_D4x4( unsigned long argb, int x, int y, int w)
{
int d = dithmat[y&3][x&3];
int n, t;
n = (int) (((argb >> 16) & 0xFF) * 0x70/255.0f + 0.5f) + d;
t = (n>>4)<<5;
n = (int) (((argb >> 8) & 0xFF) * 0x70/255.0f + 0.5f) + d;
t |= (n>>4)<<2;
n = (int) (((argb ) & 0xFF) * 0x30/255.0f + 0.5f) + d;
t |= (n>>4)<<0;
return t & 0xFF;
}
static int
_txPixQuantize_RGB332_DErr( unsigned long argb, int x, int y, int w)
{
static unsigned char a3[] = {0x00,0x24,0x49,0x6d,0x92,0xb6,0xdb,0xff};
static unsigned char a2[] = {0x00,0x55,0xaa,0xff};
static int qr, qg, qb; // quantized incoming values.
int ir, ig, ib; // incoming values.
int t;
ir = (argb >> 16) & 0xFF; // incoming pixel values.
ig = (argb >> 8) & 0xFF;
ib = (argb ) & 0xFF;
if (x == 0) qr = qg = qb = 0;
ir += errR[x] + qr;
ig += errG[x] + qg;
ib += errB[x] + qb;
qr = ir; // quantized pixel values.
qg = ig; // qR is error from pixel to left, errR is
qb = ib; // error from pixel to the top & top left.
if (qr < 0) qr = 0; if (qr > 255) qr = 255; // clamp.
if (qg < 0) qg = 0; if (qg > 255) qg = 255;
if (qb < 0) qb = 0; if (qb > 255) qb = 255;
// To RGB332.
qr = (int) (qr * 0x7ff/255.0f); qr >>= 8;
qg = (int) (qg * 0x7ff/255.0f); qg >>= 8;
qb = (int) (qb * 0x3ff/255.0f); qb >>= 8;
t = (qr << 5) | (qg << 2) | qb; // this is the value to be returned.
// Now dequantize the input, and compute & distribute the errors.
qr = a3[qr]; qr = ir - qr;
qg = a3[qg]; qg = ig - qg;
qb = a2[qb]; qb = ib - qb;
// 3/8 (=0.375) to the EAST, 3/8 to the SOUTH, 1/4 (0.25) to the SOUTH-EAST.
errR[x] = ((x == 0) ? 0 : errR[x]) + ((int) (qr * 0.375f));
errG[x] = ((x == 0) ? 0 : errG[x]) + ((int) (qg * 0.375f));
errB[x] = ((x == 0) ? 0 : errB[x]) + ((int) (qb * 0.375f));
errR[x+1] = (int) (qr * 0.250f);
errG[x+1] = (int) (qg * 0.250f);
errB[x+1] = (int) (qb * 0.250f);
qr = (int) (qr * 0.375f); // Carried to the pixel on the right.
qg = (int) (qg * 0.375f);
qb = (int) (qb * 0.375f);
return t & 0xFF;
}
/* YIQ422 done elsewhere */
static int
_txPixQuantize_A8( unsigned long argb, int x, int y, int w)
{
return (argb >> 24);
}
static int
_txPixQuantize_I8( unsigned long argb, int x, int y, int w)
{
return (
((int) (((argb >>16) & 0xFF) * .30F +
((argb >> 8) & 0xFF) * .59F +
((argb ) & 0xFF) * .11F + 0.5f )) & 0xFF);
}
static int
_txPixQuantize_AI44( unsigned long argb, int x, int y, int w)
{
return(
(int) (( ((argb>>16) & 0xFF) * .30F +
((argb>> 8) & 0xFF) * .59F +
((argb ) & 0xFF) * .11F + 0.5f ) * 0.0625f) |
(int) ((argb>>24) & 0xF0));
}
static int
_txPixQuantize_AI44_D4x4( unsigned long argb, int x, int y, int w)
{
int d = dithmat[y&3][x&3];
int n, t;
/* Don't dither alpha channel */
n = (int) ( ((argb>>16) & 0xFF) * .30F +
((argb>> 8) & 0xFF) * .59F +
((argb ) & 0xFF) * .11F + 0.5f);
n = (int) (n * 0xF0/255.0f + 0.5f) + d;
t = (n>>4);
t |= (int) ((argb>>24) & 0xF0);
return t & 0xFF;
}
static int
_txPixQuantize_AI44_DErr( unsigned long argb, int x, int y, int w)
{
int ii, t;
static int qi;
/* Don't dither alpha channel */
ii = (int) ( ((argb>>16) & 0xFF) * .30F +
((argb>> 8) & 0xFF) * .59F +
((argb ) & 0xFF) * .11F + 0.5f);
if (x == 0) qi = 0;
ii += errR[x] + qi;
qi = ii;
if (qi < 0) qi = 0; if (qi > 255) qi = 255; // clamp.
qi = (int) (qi * 0xfff/255.0f); qi >>= 8;
t = qi;
t |= (int) ((argb>>24) & 0xF0);
// Now dequantize the input, and compute & distribute the errors.
qi = (qi << 4) | qi;
qi = ii - qi;
// 3/8 (=0.375) to the EAST, 3/8 to the SOUTH, 1/4 (0.25) to the SOUTH-EAST.
errR[x] = ((x == 0) ? 0 : errR[x]) + ((int) (qi * 0.375f));
errR[x+1] = (int) (qi * 0.250f);
qi = (int) (qi * 0.375f); // Carried to the pixel on the right.
return t & 0xFF;
}
static int
_txPixQuantize_ARGB8332 ( unsigned long argb, int x, int y, int w)
{
return (
((argb>>16) & 0xE0) |
((argb>>11) & 0x1C) |
((argb>> 6) & 0x03) |
((argb>>16) & 0xFF00) );
}
static int
_txPixQuantize_ARGB8332_D4x4( unsigned long argb, int x, int y, int w)
{
int d = dithmat[y&3][x&3];
int n, t;
n = (int) (((argb >> 16) & 0xFF) * 0x70/255.0f + 0.5f) + d;
t = (n>>4)<<5;
n = (int) (((argb >> 8) & 0xFF) * 0x70/255.0f + 0.5f) + d;
t |= (n>>4)<<2;
n = (int) (((argb ) & 0xFF) * 0x30/255.0f + 0.5f) + d;
t |= (n>>4)<<0;
t |= ((argb >> 16) & 0xFF00);
return t & 0xFFFF;
}
static int
_txPixQuantize_ARGB8332_DErr( unsigned long argb, int x, int y, int w)
{
int t;
t = _txPixQuantize_RGB332_DErr(argb, x, y, w);
t |= ((argb >> 16) & 0xFF00);
return t & 0xFFFF;
}
/* AYIQ8422 done elsewhere */
static int
_txPixQuantize_RGB565( unsigned long argb, int x, int y, int w)
{
return (
((argb >> 8) & 0xF800) |
((argb >> 5) & 0x07E0) |
((argb >> 3) & 0x001F) );
}
static int
_txPixQuantize_RGB565_D4x4 ( unsigned long argb, int x, int y, int w)
{
int d = dithmat[y&3][x&3];
int n, t;
n = (int) (((argb >> 16) & 0xFF) * 0x1F0/255.0f + 0.5f) + d;
t = (n>>4)<<11;
n = (int) (((argb >> 8) & 0xFF) * 0x3F0/255.0f + 0.5f) + d;
t |= (n>>4)<<5;
n = (int) (((argb ) & 0xFF) * 0x1F0/255.0f + 0.5f) + d;
t |= (n>>4)<<0;
return t & 0xFFFF;
}
static int
_txPixQuantize_RGB565_DErr ( unsigned long argb, int x, int y, int w)
{
static int qr, qg, qb; // quantized incoming values.
int ir, ig, ib; // incoming values.
int t;
ir = (argb >> 16) & 0xFF; // incoming pixel values.
ig = (argb >> 8) & 0xFF;
ib = (argb ) & 0xFF;
if (x == 0) qr = qg = qb = 0;
ir += errR[x] + qr;
ig += errG[x] + qg;
ib += errB[x] + qb;
qr = ir; // quantized pixel values.
qg = ig; // qR is error from pixel to left, errR is
qb = ib; // error from pixel to the top & top left.
if (qr < 0) qr = 0; if (qr > 255) qr = 255; // clamp.
if (qg < 0) qg = 0; if (qg > 255) qg = 255;
if (qb < 0) qb = 0; if (qb > 255) qb = 255;
// To RGB565.
qr = (int) (qr * 0x1FFF/255.0f); qr >>= 8;
qg = (int) (qg * 0x3FFF/255.0f); qg >>= 8;
qb = (int) (qb * 0x1FFF/255.0f); qb >>= 8;
t = (qr << 11) | (qg << 5) | qb; // this is the value to be returned.
// Now dequantize the input, and compute & distribute the errors.
qr = (qr << 3) | (qr >> 2);
qg = (qg << 2) | (qg >> 4);
qb = (qb << 3) | (qb >> 2);
qr = ir - qr;
qg = ig - qg;
qb = ib - qb;
// 3/8 (=0.375) to the EAST, 3/8 to the SOUTH, 1/4 (0.25) to the SOUTH-EAST.
errR[x] = ((x == 0) ? 0 : errR[x]) + ((int) (qr * 0.375f));
errG[x] = ((x == 0) ? 0 : errG[x]) + ((int) (qg * 0.375f));
errB[x] = ((x == 0) ? 0 : errB[x]) + ((int) (qb * 0.375f));
errR[x+1] = (int) (qr * 0.250f);
errG[x+1] = (int) (qg * 0.250f);
errB[x+1] = (int) (qb * 0.250f);
qr = (int) (qr * 0.375f); // Carried to the pixel on the right.
qg = (int) (qg * 0.375f);
qb = (int) (qb * 0.375f);
return t & 0xFFFF;
}
static int
_txPixQuantize_ARGB1555( unsigned long argb, int x, int y, int w)
{
return (
((argb >> 9) & 0x7C00) |
((argb >> 6) & 0x03E0) |
((argb >> 3) & 0x001F) |
((argb >> 24) ? 0x8000 : 0) );
}
static int
_txPixQuantize_ARGB1555_D4x4 ( unsigned long argb, int x, int y, int w)
{
int d = dithmat[y&3][x&3];
int n, t;
n = (int) (((argb >> 16) & 0xFF) * 0x1F0/255.0f + 0.5f) + d;
t = (n>>4)<<10;
n = (int) (((argb >> 8) & 0xFF) * 0x1F0/255.0f + 0.5f) + d;
t |= (n>>4)<<5;
n = (int) (((argb ) & 0xFF) * 0x1F0/255.0f + 0.5f) + d;
t |= (n>>4)<<0;
t |= ((argb >> 24) ? 0x8000 : 0);
return t & 0xFFFF;
}
static int
_txPixQuantize_ARGB1555_DErr ( unsigned long argb, int x, int y, int w)
{
static int qr, qg, qb; // quantized incoming values.
int ir, ig, ib; // incoming values.
int t;
ir = (argb >> 16) & 0xFF; // incoming pixel values.
ig = (argb >> 8) & 0xFF;
ib = (argb ) & 0xFF;
if (x == 0) qr = qg = qb = 0;
ir += errR[x] + qr;
ig += errG[x] + qg;
ib += errB[x] + qb;
qr = ir; // quantized pixel values.
qg = ig; // qR is error from pixel to left, errR is
qb = ib; // error from pixel to the top & top left.
if (qr < 0) qr = 0; if (qr > 255) qr = 255; // clamp.
if (qg < 0) qg = 0; if (qg > 255) qg = 255;
if (qb < 0) qb = 0; if (qb > 255) qb = 255;
// To RGB565.
qr = (int) (qr * 0x1FFF/255.0f); qr >>= 8;
qg = (int) (qg * 0x1FFF/255.0f); qg >>= 8;
qb = (int) (qb * 0x1FFF/255.0f); qb >>= 8;
t = (qr << 10) | (qg << 5) | qb; // this is the value to be returned.
t |= ((argb >> 24) ? 0x8000 : 0);
// Now dequantize the input, and compute & distribute the errors.
qr = (qr << 3) | (qr >> 2);
qg = (qg << 3) | (qg >> 2);
qb = (qb << 3) | (qb >> 2);
qr = ir - qr;
qg = ig - qg;
qb = ib - qb;
// 3/8 (=0.375) to the EAST, 3/8 to the SOUTH, 1/4 (0.25) to the SOUTH-EAST.
errR[x] = ((x == 0) ? 0 : errR[x]) + ((int) (qr * 0.375f));
errG[x] = ((x == 0) ? 0 : errG[x]) + ((int) (qg * 0.375f));
errB[x] = ((x == 0) ? 0 : errB[x]) + ((int) (qb * 0.375f));
errR[x+1] = (int) (qr * 0.250f);
errG[x+1] = (int) (qg * 0.250f);
errB[x+1] = (int) (qb * 0.250f);
qr = (int) (qr * 0.375f); // Carried to the pixel on the right.
qg = (int) (qg * 0.375f);
qb = (int) (qb * 0.375f);
return t & 0xFFFF;
}
static int
_txPixQuantize_ARGB4444 (unsigned long argb, int x, int y, int w)
{
return (
((argb >> 12) & 0x0F00) |
((argb >> 8) & 0x00F0) |
((argb >> 4) & 0x000F) |
((argb >> 16) & 0xF000) );
}
static int
_txPixQuantize_ARGB4444_D4x4 (unsigned long argb, int x, int y, int w)
{
int d = dithmat[y&3][x&3];
int n, t;
n = (int) (((argb >> 16) & 0xFF) * 0xF0/255.0f + 0.5f) + d;
t = (n>>4)<<8;
n = (int) (((argb >> 8) & 0xFF) * 0xF0/255.0f + 0.5f) + d;
t |= (n>>4)<<4;
n = (int) (((argb ) & 0xFF) * 0xF0/255.0f + 0.5f) + d;
t |= (n>>4)<<0;
t |= (argb >> 16) & 0xF000;
return t & 0xFFFF;
}
static int
_txPixQuantize_ARGB4444_DErr (unsigned long argb, int x, int y, int w)
{
static int qr, qg, qb; // quantized incoming values.
int ir, ig, ib; // incoming values.
int t;
ir = (argb >> 16) & 0xFF; // incoming pixel values.
ig = (argb >> 8) & 0xFF;
ib = (argb ) & 0xFF;
if (x == 0) qr = qg = qb = 0;
ir += errR[x] + qr;
ig += errG[x] + qg;
ib += errB[x] + qb;
qr = ir; // quantized pixel values.
qg = ig; // qR is error from pixel to left, errR is
qb = ib; // error from pixel to the top & top left.
if (qr < 0) qr = 0; if (qr > 255) qr = 255; // clamp.
if (qg < 0) qg = 0; if (qg > 255) qg = 255;
if (qb < 0) qb = 0; if (qb > 255) qb = 255;
// To RGB565.
qr = (int) (qr * 0xFFF/255.0f); qr >>= 8;
qg = (int) (qg * 0xFFF/255.0f); qg >>= 8;
qb = (int) (qb * 0xFFF/255.0f); qb >>= 8;
t = (qr << 8) | (qg << 4) | qb; // this is the value to be returned.
t |= (argb >> 16) & 0xF000;
// Now dequantize the input, and compute & distribute the errors.
qr = (qr << 4) | (qr >> 0);
qg = (qg << 4) | (qg >> 0);
qb = (qb << 4) | (qb >> 0);
qr = ir - qr;
qg = ig - qg;
qb = ib - qb;
// 3/8 (=0.375) to the EAST, 3/8 to the SOUTH, 1/4 (0.25) to the SOUTH-EAST.
errR[x] = ((x == 0) ? 0 : errR[x]) + ((int) (qr * 0.375f));
errG[x] = ((x == 0) ? 0 : errG[x]) + ((int) (qg * 0.375f));
errB[x] = ((x == 0) ? 0 : errB[x]) + ((int) (qb * 0.375f));
errR[x+1] = (int) (qr * 0.250f);
errG[x+1] = (int) (qg * 0.250f);
errB[x+1] = (int) (qb * 0.250f);
qr = (int) (qr * 0.375f); // Carried to the pixel on the right.
qg = (int) (qg * 0.375f);
qb = (int) (qb * 0.375f);
return t & 0xFFFF;
}
static int
_txPixQuantize_AI88( unsigned long argb, int x, int y, int w)
{
return (
(((int) (((argb >>16) & 0xFF) * .30F +
((argb >> 8) & 0xFF) * .59F +
((argb ) & 0xFF) * .11F + 0.5f )) & 0xFF) |
((argb >>16) & 0xFF00) );
}
static void
_txImgQuantize(char *dst, char *src, int w, int h, FxU32 format, FxU32 dither)
{
int (*quantizer)(unsigned long argb, int x, int y, int w) = NULL;
int x, y;
dither &= TX_DITHER_MASK;
if (dither == TX_DITHER_ERR) { // Error diffusion, floyd-steinberg
int i;
// Clear error diffusion accumulators.
for (i=0; i<w; i++) errR[i] = errG[i] = errB[i] = 0;
switch(format) {
case GR_TEXFMT_RGB_332: quantizer = _txPixQuantize_RGB332_DErr;
break;
case GR_TEXFMT_A_8: quantizer = _txPixQuantize_A8;
break;
case GR_TEXFMT_I_8: quantizer = _txPixQuantize_I8;
break;
case GR_TEXFMT_AI_44: quantizer = _txPixQuantize_AI44_DErr;
break;
case GR_TEXFMT_ARGB_8332: quantizer = _txPixQuantize_ARGB8332_DErr;
break;
case GR_TEXFMT_RGB_565: quantizer = _txPixQuantize_RGB565_DErr;
break;
case GR_TEXFMT_ARGB_1555: quantizer = _txPixQuantize_ARGB1555_DErr;
break;
case GR_TEXFMT_ARGB_4444: quantizer = _txPixQuantize_ARGB4444_DErr;
break;
case GR_TEXFMT_AI_88: quantizer = _txPixQuantize_AI88;
break;
default: txPanic("Bad case in txQuantize()\n"); break;
}
}else if (dither == TX_DITHER_4x4) { // 4x4 ordered dithering.
switch(format) {
case GR_TEXFMT_RGB_332: quantizer = _txPixQuantize_RGB332_D4x4;
break;
case GR_TEXFMT_A_8: quantizer = _txPixQuantize_A8;
break;
case GR_TEXFMT_I_8: quantizer = _txPixQuantize_I8;
break;
case GR_TEXFMT_AI_44: quantizer = _txPixQuantize_AI44_D4x4;
break;
case GR_TEXFMT_ARGB_8332: quantizer = _txPixQuantize_ARGB8332_D4x4;
break;
case GR_TEXFMT_RGB_565: quantizer = _txPixQuantize_RGB565_D4x4;
break;
case GR_TEXFMT_ARGB_1555: quantizer = _txPixQuantize_ARGB1555_D4x4;
break;
case GR_TEXFMT_ARGB_4444: quantizer = _txPixQuantize_ARGB4444_D4x4;
break;
case GR_TEXFMT_AI_88: quantizer = _txPixQuantize_AI88;
break;
default: txPanic("Bad case in txQuantize()\n");
break;
}
} else { // No dithering.
switch(format) {
case GR_TEXFMT_RGB_332: quantizer = _txPixQuantize_RGB332;
break;
case GR_TEXFMT_A_8: quantizer = _txPixQuantize_A8;
break;
case GR_TEXFMT_I_8: quantizer = _txPixQuantize_I8;
break;
case GR_TEXFMT_AI_44: quantizer = _txPixQuantize_AI44;
break;
case GR_TEXFMT_ARGB_8332: quantizer = _txPixQuantize_ARGB8332;
break;
case GR_TEXFMT_RGB_565: quantizer = _txPixQuantize_RGB565;
break;
case GR_TEXFMT_ARGB_1555: quantizer = _txPixQuantize_ARGB1555;
break;
case GR_TEXFMT_ARGB_4444: quantizer = _txPixQuantize_ARGB4444;
break;
case GR_TEXFMT_AI_88: quantizer = _txPixQuantize_AI88;
break;
default: txPanic("Bad case in txQuantize()\n");
break;
}
}
if (format < GR_TEXFMT_16BIT) {
// 8 bit dst
for (y=0; y<h; y++) {
for (x=0; x<w; x++) {
*dst++ = (*quantizer)(*(unsigned long *)src, x, y, w);
src += 4;
}
}
} else {
// 16 bit dst.
unsigned short *dst16 = (unsigned short *) dst;
for (y=0; y<h; y++) {
for (x=0; x<w; x++) {
*dst16++ = (*quantizer)(*(unsigned long *)src, x, y, w);
src += 4;
}
}
}
}
/*
* Reduce an ARGB8888 image to 16bits or 8bits/pixel, possibly dithering
* the resulting image using either ordered 4x4 or error-diffusion dithering.
*
* For the special cases of YIQ image, you also get the choice of 2 different
* quality levels in each of the compression cases.
*/
void
txMipQuantize(TxMip *pxMip, TxMip *txMip, int format, FxU32 dither, FxU32 compression)
{
int i, w, h;
if( txVerbose )
{
printf("Quantizing: (to %s)", Format_Name[format]);
}
pxMip->format = format;
pxMip->width = txMip->width;
pxMip->height = txMip->height;
switch(format) {
// Special cases.
case GR_TEXFMT_YIQ_422:
case GR_TEXFMT_AYIQ_8422:
if( txVerbose )
printf(".\n");
txMipNcc(pxMip, txMip, format, dither, compression);
return;
case GR_TEXFMT_ARGB_8888:
// Copy source to destination, and be done.
if( txVerbose )
printf(".\n");
memcpy(pxMip->data[0], txMip->data[0], txMip->size);
return;
case GR_TEXFMT_P_8:
case GR_TEXFMT_AP_88:
if( txVerbose )
printf(".\n");
txMipPal256(pxMip, txMip, format, dither, compression);
return;
// Normal cases
case GR_TEXFMT_A_8:
case GR_TEXFMT_I_8:
case GR_TEXFMT_AI_44:
case GR_TEXFMT_RGB_332:
case GR_TEXFMT_RGB_565:
case GR_TEXFMT_ARGB_8332:
case GR_TEXFMT_ARGB_1555:
case GR_TEXFMT_ARGB_4444:
case GR_TEXFMT_AI_88:
break;
// Bad cases
default:
txPanic("Bad data format in Quantize\n");
return;
}
// We deal with rest of them here one mipmap level at a time.
w = txMip->width;
h = txMip->height;
for (i=0; i< pxMip->depth; i++) {
if( txVerbose )
printf(" %dx%d", w, h);
_txImgQuantize(pxMip->data[i], txMip->data[i], w, h, format, dither);
w >>= 1; if (w == 0) w = 1;
h >>= 1; if (h == 0) h = 1;
}
if( txVerbose )
printf(".\n");
}