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/* CCVT: ColourConVerT: simple library for converting colourspaces
Copyright (C) 2002 Nemosoft Unv.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
For questions, remarks, patches, etc. for this program, the author can be
reached at nemosoft@smcc.demon.nl.
*/
/* This file contains CCVT functions that aren't available in assembly yet
(or are not worth programming)
*/
/*
* $Log: ccvt_misc.c,v $
* Revision 1.7 2003/01/02 04:10:19 nemosoft
* Adding ''upside down" conversion to rgb/bgr routines
*
* Revision 1.6 2002/12/03 23:29:11 nemosoft
* *** empty log message ***
*
* Revision 1.5 2002/12/03 23:27:41 nemosoft
* fixing log messages (gcc 3.2 complaining)
*
Revision 1.4 2002/12/03 22:29:07 nemosoft
Fixing up FTP stuff and some video
Revision 1.3 2002/11/03 22:46:25 nemosoft
Adding various RGB to RGB functions.
Adding proper copyright header too.
*/
#include "ccvt.h"
#include "ccvt_types.h"
/* YUYV: two Y's and one U/V */
void ccvt_yuyv_rgb32(int width, int height, const void *src, void *dst)
{
}
void ccvt_yuyv_bgr32(int width, int height, const void *src, void *dst)
{
const unsigned char *s;
PIXTYPE_bgr32 *d;
int l, c;
int r, g, b, cr, cg, cb, y1, y2;
l = height;
s = src;
d = dst;
while (l--) {
c = width >> 2;
while (c--) {
y1 = *s++;
cb = ((*s - 128) * 454) >> 8;
cg = (*s++ - 128) * 88;
y2 = *s++;
cr = ((*s - 128) * 359) >> 8;
cg = (cg + (*s++ - 128) * 183) >> 8;
r = y1 + cr;
b = y1 + cb;
g = y1 - cg;
SAT(r);
SAT(g);
SAT(b);
d->b = b;
d->g = g;
d->r = r;
d++;
r = y2 + cr;
b = y2 + cb;
g = y2 - cg;
SAT(r);
SAT(g);
SAT(b);
d->b = b;
d->g = g;
d->r = r;
d++;
}
}
}
void ccvt_yuyv_420p(int width, int height, const void *src, void *dsty, void *dstu, void *dstv)
{
int n, l, j;
const unsigned char *s1, *s2;
unsigned char *dy, *du, *dv;
dy = (unsigned char *)dsty;
du = (unsigned char *)dstu;
dv = (unsigned char *)dstv;
s1 = (unsigned char *)src;
s2 = s1; // keep pointer
n = width * height;
for (; n > 0; n--) {
*dy = *s1;
dy++;
s1 += 2;
}
/* Two options here: average U/V values, or skip every second row */
s1 = s2; // restore pointer
s1++; // point to U
for (l = 0; l < height; l += 2) {
s2 = s1 + width * 2; // odd line
for (j = 0; j < width; j += 2) {
*du = (*s1 + *s2) / 2;
du++;
s1 += 2;
s2 += 2;
*dv = (*s1 + *s2) / 2;
dv++;
s1 += 2;
s2 += 2;
}
s1 = s2;
}
}
/* RGB/BGR to RGB/BGR */
#define RGBBGR_BODY24(TIN, TOUT) \
void ccvt_ ## TIN ## _ ## TOUT (int width, int height, const void *const src, void *const dst) \
{ \
const PIXTYPE_ ## TIN *in = src; \
PIXTYPE_ ## TOUT *out = dst; \
int l, c, stride = 0; \
\
if (height < 0) { stride = width; height = -height; } \
out += ((height - 1) * width); \
stride *= 2; \
for (l = 0; l < height; l++) { \
for (c = 0; c < width; c++) { \
out->r = in->r; \
out->g = in->g; \
out->b = in->b; \
in++; \
out++; \
} \
out -= stride; \
} \
}
#define RGBBGR_BODY32(TIN, TOUT) \
void ccvt_ ## TIN ## _ ## TOUT (int width, int height, const void *const src, void *const dst) \
{ \
const PIXTYPE_ ## TIN *in = src; \
PIXTYPE_ ## TOUT *out = dst; \
int l, c, stride = 0; \
\
if (height < 0) { stride = width; height = -height; } \
out += ((height - 1) * width); \
stride *= 2; \
for (l = 0; l < height; l++) { \
for (c = 0; c < width; c++) { \
out->r = in->r; \
out->g = in->g; \
out->b = in->b; \
out->z = 0; \
in++; \
out++; \
} \
out -= stride; \
} \
}
RGBBGR_BODY32(bgr24, bgr32)
RGBBGR_BODY32(bgr24, rgb32)
RGBBGR_BODY32(rgb24, bgr32)
RGBBGR_BODY32(rgb24, rgb32)
RGBBGR_BODY24(bgr32, bgr24)
RGBBGR_BODY24(bgr32, rgb24)
RGBBGR_BODY24(rgb32, bgr24)
RGBBGR_BODY24(rgb32, rgb24)
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