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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 */
-