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/*
* gray.c --
*
* More procedures to dither grey-scale images.
*
*/
/*
* Copyright (c) 1995 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include "video.h"
#include "proto.h"
#include "dither.h"
/*
*--------------------------------------------------------------
*
* GrayDitherImage --
*
* Dithers image into 128 gray scales. Simply maps luminance
* value into 1 of 128 gray scale colors (divide by two, essentially).
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
GrayDitherImage(lum, cr, cb, out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *out;
int w, h;
{
int i, max = w*h/16;
for (i=0; i<max; i++) {
out[0] = pixel[lum[0]];
out[1] = pixel[lum[1]];
out[2] = pixel[lum[2]];
out[3] = pixel[lum[3]];
out[4] = pixel[lum[4]];
out[5] = pixel[lum[5]];
out[6] = pixel[lum[6]];
out[7] = pixel[lum[7]];
out[8] = pixel[lum[8]];
out[9] = pixel[lum[9]];
out[10] = pixel[lum[10]];
out[11] = pixel[lum[11]];
out[12] = pixel[lum[12]];
out[13] = pixel[lum[13]];
out[14] = pixel[lum[14]];
out[15] = pixel[lum[15]];
out += 16;
lum += 16;
}
}
void
Gray16DitherImage(lum, cr, cb, p_out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *p_out;
int w, h;
{
unsigned short *out = (unsigned short *)p_out;
int i, max = w*h/16;
for (i=0; i<max; i++) {
out[0] = wpixel[lum[0]];
out[1] = wpixel[lum[1]];
out[2] = wpixel[lum[2]];
out[3] = wpixel[lum[3]];
out[4] = wpixel[lum[4]];
out[5] = wpixel[lum[5]];
out[6] = wpixel[lum[6]];
out[7] = wpixel[lum[7]];
out[8] = wpixel[lum[8]];
out[9] = wpixel[lum[9]];
out[10] = wpixel[lum[10]];
out[11] = wpixel[lum[11]];
out[12] = wpixel[lum[12]];
out[13] = wpixel[lum[13]];
out[14] = wpixel[lum[14]];
out[15] = wpixel[lum[15]];
out += 16;
lum += 16;
}
}
void
Gray32DitherImage(lum, cr, cb, p_out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *p_out;
int w, h;
{
unsigned int *out = (unsigned int *)p_out;
int i, max = w*h/16;
for (i=0; i<max; i++) {
out[0] = wpixel[lum[0]];
out[1] = wpixel[lum[1]];
out[2] = wpixel[lum[2]];
out[3] = wpixel[lum[3]];
out[4] = wpixel[lum[4]];
out[5] = wpixel[lum[5]];
out[6] = wpixel[lum[6]];
out[7] = wpixel[lum[7]];
out[8] = wpixel[lum[8]];
out[9] = wpixel[lum[9]];
out[10] = wpixel[lum[10]];
out[11] = wpixel[lum[11]];
out[12] = wpixel[lum[12]];
out[13] = wpixel[lum[13]];
out[14] = wpixel[lum[14]];
out[15] = wpixel[lum[15]];
out += 16;
lum += 16;
}
}
/*
*--------------------------------------------------------------
*
* Gray2DitherImage --
*
* Dithers image into 128 gray scales. Simply maps luminance
* value into 1 of 128 gray scale colors (divide by two, essentially).
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
void
Gray2DitherImage(lum, cr, cb, p_out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *p_out;
int w, h;
{
int x, y;
unsigned short *out = (unsigned short *)p_out;
unsigned short *out2 = out + w;
for (y=0; y<h; y++) {
for (x=0; x<w; x+=16) {
out[0] = out2[0] = wpixel[lum[0]];
out[1] = out2[1] = wpixel[lum[1]];
out[2] = out2[2] = wpixel[lum[2]];
out[3] = out2[3] = wpixel[lum[3]];
out[4] = out2[4] = wpixel[lum[4]];
out[5] = out2[5] = wpixel[lum[5]];
out[6] = out2[6] = wpixel[lum[6]];
out[7] = out2[7] = wpixel[lum[7]];
out[8] = out2[8] = wpixel[lum[8]];
out[9] = out2[9] = wpixel[lum[9]];
out[10] = out2[10] = wpixel[lum[10]];
out[11] = out2[11] = wpixel[lum[11]];
out[12] = out2[12] = wpixel[lum[12]];
out[13] = out2[13] = wpixel[lum[13]];
out[14] = out2[14] = wpixel[lum[14]];
out[15] = out2[15] = wpixel[lum[15]];
out += 16;
out2 += 16;
lum += 16;
}
out += w;
out2 += w;
}
}
void
Gray216DitherImage(lum, cr, cb, p_out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *p_out;
int w, h;
{
int x, y;
unsigned int *out = (unsigned int *)p_out;
unsigned int *out2 = out + w;
for (y=0; y<h; y++) {
for (x=0; x<w; x+=16) {
out[0] = out2[0] = wpixel[lum[0]];
out[1] = out2[1] = wpixel[lum[1]];
out[2] = out2[2] = wpixel[lum[2]];
out[3] = out2[3] = wpixel[lum[3]];
out[4] = out2[4] = wpixel[lum[4]];
out[5] = out2[5] = wpixel[lum[5]];
out[6] = out2[6] = wpixel[lum[6]];
out[7] = out2[7] = wpixel[lum[7]];
out[8] = out2[8] = wpixel[lum[8]];
out[9] = out2[9] = wpixel[lum[9]];
out[10] = out2[10] = wpixel[lum[10]];
out[11] = out2[11] = wpixel[lum[11]];
out[12] = out2[12] = wpixel[lum[12]];
out[13] = out2[13] = wpixel[lum[13]];
out[14] = out2[14] = wpixel[lum[14]];
out[15] = out2[15] = wpixel[lum[15]];
out += 16;
out2 += 16;
lum += 16;
}
out += w;
out2 += w;
}
}
#ifndef SIXTYFOUR_BIT
void
Gray232DitherImage(lum, cr, cb, p_out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *p_out;
int w, h;
{
int x, y;
unsigned int *out = (unsigned int *)p_out;
unsigned int *out2 = out + w * 2;
for (y=0; y<h; y++) {
for (x=0; x<w; x+=16) {
out[0] = out2[0] = out[1] = out2[1] = wpixel[lum[0]];
out[2] = out2[2] = out[3] = out2[3] = wpixel[lum[1]];
out[4] = out2[4] = out[5] = out2[5] = wpixel[lum[2]];
out[6] = out2[6] = out[7] = out2[7] = wpixel[lum[3]];
out[8] = out2[8] = out[9] = out2[9] = wpixel[lum[4]];
out[10] = out2[10] = out[11] = out2[11] = wpixel[lum[5]];
out[12] = out2[12] = out[13] = out2[13] = wpixel[lum[6]];
out[14] = out2[14] = out[15] = out2[15] = wpixel[lum[7]];
out[16] = out2[16] = out[17] = out2[17] = wpixel[lum[8]];
out[18] = out2[18] = out[19] = out2[19] = wpixel[lum[9]];
out[20] = out2[20] = out[21] = out2[21] = wpixel[lum[10]];
out[22] = out2[22] = out[23] = out2[23] = wpixel[lum[11]];
out[24] = out2[24] = out[25] = out2[25] = wpixel[lum[12]];
out[26] = out2[26] = out[27] = out2[27] = wpixel[lum[13]];
out[28] = out2[28] = out[29] = out2[29] = wpixel[lum[14]];
out[30] = out2[30] = out[31] = out2[31] = wpixel[lum[15]];
out += 32;
out2 += 32;
lum += 16;
}
out += w * 2;
out2 += w * 2;
}
}
#else /* def SIXTYFOUR_BIT */
void
Gray232DitherImage(lum, cr, cb, p_out, h, w)
unsigned char *lum;
unsigned char *cr;
unsigned char *cb;
unsigned char *p_out;
int w, h;
{
int x, y;
unsigned long *out = (unsigned long *)p_out;
unsigned long *out2 = out + w;
for (y=0; y<h; y++) {
for (x=0; x<w; x+=16) {
out[0] = out2[0] = wpixel[lum[0]];
out[2] = out2[2] = wpixel[lum[1]];
out[4] = out2[4] = wpixel[lum[2]];
out[6] = out2[6] = wpixel[lum[3]];
out[8] = out2[8] = wpixel[lum[4]];
out[10] = out2[10] = wpixel[lum[5]];
out[12] = out2[12] = wpixel[lum[6]];
out[14] = out2[14] = wpixel[lum[7]];
out[16] = out2[16] = wpixel[lum[8]];
out[18] = out2[18] = wpixel[lum[9]];
out[20] = out2[20] = wpixel[lum[10]];
out[22] = out2[22] = wpixel[lum[11]];
out[24] = out2[24] = wpixel[lum[12]];
out[26] = out2[26] = wpixel[lum[13]];
out[28] = out2[28] = wpixel[lum[14]];
out[30] = out2[30] = wpixel[lum[15]];
out += 16;
out2 += 16;
lum += 16;
}
out += w;
out2 += w;
}
}
#endif /* def SIXTYFOUR_BIT */