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/*
* Cellular Automata Extension Module for pdp - Main system code
* Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "pdp_ca.h"
/* all symbols are C-style */
#ifdef __cplusplus
extern "C"
{
#endif
/* check if packet is a valid ca packet */
int pdp_type_isvalid_ca(int packet)
{
t_pdp *header = pdp_packet_header(packet);
if (!header) return 0;
if (PDP_CA != header->type) return 0;
if (PDP_CA_STANDARD != pdp_type_ca_info(header)->encoding) return 0;
return 1;
}
/* convert a CA packet to greyscale */
inline void _pdp_type_ca2grey_convert_word(unsigned short int source, short int *dest)
{
int i;
for (i = 15; i>=0; i--){
dest[i] = ((unsigned short)(((short int)(source & 0x8000)) >> 14)) >> 1;
source <<= 1;
}
}
int pdp_type_ca2grey(int packet)
{
int w, h, s, x, y, srcindex;
long long offset, xoffset, yoffset;
short int *dest;
unsigned short int *source;
t_pdp *header;
t_pdp *newheader;
int newpacket;
if (!(pdp_type_isvalid_ca(packet))) return -1;
header = pdp_packet_header(packet);
w = pdp_type_ca_info(header)->width;
h = pdp_type_ca_info(header)->height;
s = w*h;
source = (unsigned short int *)pdp_packet_data(packet);
offset = pdp_type_ca_info(header)->offset;
yoffset = (offset / w) * w;
xoffset = offset % w;
//post("pdp_type_ca2grey: offset: %d, xoffset: %d, yoffset: %d", offset, xoffset, yoffset);
newpacket = pdp_packet_new(PDP_IMAGE, s<<1);
newheader = pdp_packet_header(newpacket);
newheader->info.image.width = w;
newheader->info.image.height = h;
newheader->info.image.encoding = PDP_IMAGE_GREY;
dest = (short int *)pdp_packet_data(newpacket);
#define check_srcindex \
if (srcindex >= (s >> 4)) post ("pdp_type_ca2grey: srcindex out of bound");
#define check_dstindex \
if ((x+y) >= s) post ("pdp_type_ca2grey: dstindex out of bound");
/* debug : dont' shift offset
if (0){
for(y=0; y< (h*w); y+=w){
for(x=0; x<w; x+=16){
_pdp_type_ca2grey_convert_word (source[(x+y)>>4], &dest[x+y]);
}
}
return newpacket;
}
*/
/* create top left */
for (y=0; y < (h*w) - yoffset; y+=w) {
for (x=0; x< (w - xoffset); x+=16) {
srcindex = (x+xoffset + y+yoffset) >> 4;
//check_srcindex;
//check_dstindex;
_pdp_type_ca2grey_convert_word (source[srcindex], &dest[x+y]);
}
}
/* create top right */
for (y=0; y < (h*w) - yoffset; y+=w) {
for (x = (w - xoffset); x < w; x+=16) {
srcindex = (x+xoffset-w + y+yoffset) >> 4;
//check_srcindex;
//check_dstindex;
_pdp_type_ca2grey_convert_word (source[srcindex], &dest[x+y]);
}
}
/* create bottom left */
for (y=(h*w) - yoffset; y < h*w; y+=w) {
for (x=0; x< (w - xoffset); x+=16) {
srcindex = (x+xoffset + y+yoffset-(w*h)) >> 4;
//check_srcindex;
//check_dstindex;
_pdp_type_ca2grey_convert_word (source[srcindex], &dest[x+y]);
}
}
/* create bottom right */
for (y=(h*w) - yoffset; y < h*w; y+=w) {
for (x = (w - xoffset); x < w; x+=16) {
srcindex = (x+xoffset-w + y+yoffset-(w*h)) >> 4;
//check_srcindex;
//check_dstindex;
_pdp_type_ca2grey_convert_word (source[srcindex], &dest[x+y]);
}
}
return newpacket;
}
inline unsigned short int _pdp_type_grey2ca_convert_word(short int *src, short int threshold)
{
short int tmp;
short int dest = 0;
int i;
for (i = 15; i >= 0; i--){
dest <<= 1;
dest |= (src[i] > threshold);
}
return dest;
}
int pdp_type_grey2ca(int packet, short int threshold)
{
int w, h, s, x, y, srcindex;
long long offset, xoffset, yoffset;
short int *dest;
short int *source;
t_pdp *header;
t_pdp *newheader;
int newpacket;
if (!(pdp_type_isvalid_image(packet))) return -1;
header = pdp_packet_header(packet);
w = header->info.image.width;
h = header->info.image.height;
s = w*h;
source = (unsigned short int *)pdp_packet_data(packet);
if ( (PDP_IMAGE_GREY != header->info.image.encoding)
&& (PDP_IMAGE_YV12 != header->info.image.encoding)) return -1;
newpacket = pdp_packet_new(PDP_CA, s>>3);
newheader = pdp_packet_header(newpacket);
pdp_type_ca_info(newheader)->width = w;
pdp_type_ca_info(newheader)->height = h;
pdp_type_ca_info(newheader)->encoding = PDP_CA_STANDARD;
pdp_type_ca_info(newheader)->offset = 0;
dest = (short int *)pdp_packet_data(newpacket);
for(y=0; y< (h*w); y+=w){
for(x=0; x<w; x+=16){
dest[(x+y)>>4] = _pdp_type_grey2ca_convert_word (&source[x+y], threshold);
}
}
return newpacket;
}
/* returns a pointer to the ca subheader given the pdp header */
t_ca *pdp_type_ca_info(t_pdp *x){return (t_ca *)(&x->info.raw);}
void pdp_ca_setup(void);
void pdp_ca2image_setup(void);
void pdp_image2ca_setup(void);
void pdp_scaf_setup(void)
{
/* babble */
post ("PDP: pdp_scaf extension lib (mmx version)");
/* setup modules */
pdp_ca_setup();
pdp_ca2image_setup();
pdp_image2ca_setup();
}
#ifdef __cplusplus
}
#endif
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