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/*
* postprocess.c
*
* Here are the decompression function for the compressed photos and the
* postprocessing for uncompressed photos.
*
* Copyright (c) 2003 Theodore Kilgore <kilgota@auburn.edu>
* Camera library support under libgphoto2.1.1 for camera(s)
* with chipset from Service & Quality Technologies, Taiwan.
* The chip supported by this driver is presumed to be the SQ905,
*
* Licensed under GNU Lesser General Public License, as part of Gphoto
* camera support project. For a copy of the license, see the file
* COPYING in the main source tree of libgphoto2.
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <math.h>
#ifdef OS2
#include <db.h>
#endif
#include <gphoto2/gphoto2.h>
#include <gphoto2/gphoto2-port.h>
#include "sq905.h"
#define GP_MODULE "sq905"
#define RED 0
#define GREEN 1
#define BLUE 2
#ifndef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
int
sq_decompress (SQModel model, unsigned char *output, unsigned char *data,
int w, int h)
{
/*
* Data arranged in planar form. We decompress the raw data first,
* one colorplane at a time, and put the results into a standard
* Bayer pattern. The byte-reversal routine having been done already,
* the planes are in the order RBG. The R and B planes each have
* dimensions (w/4)*(h/2), and the G is (w/4)*h.
*/
unsigned char *red, *green, *blue, *red_out, *green_out, *blue_out;
int i, m;
unsigned char temp;
red = data;
blue = data + w*h/8;
green = data + w*h/4;
red_out = malloc(w*h/4);
if (!red_out)
return -1;
blue_out = malloc(w*h/4);
if (!blue_out) {
free (red_out);
return -1;
}
green_out = malloc(w*h/2);
if (!green_out) {
free (red_out);
free (blue_out);
return -1;
}
decode_panel (red_out, red, w/2, h/2, RED);
decode_panel (blue_out, blue, w/2, h/2, BLUE);
decode_panel (green_out, green, w/2, h, GREEN);
/* Now, put things in their proper places */
for ( m = 0; m < h/2 ; m++ ) {
for ( i = 0; i < w/2; i++ ) {
/* Reds in even rows, even columns */
output[(2*m)*w+2*i ] = red_out[m*w/2+i ];
/* Blues in odd rows, odd columns */
output[(2*m+1)*w+2*i +1] = blue_out[m*w/2+i];
/* For the greens (note m*w = (2*m)*w/2) we
* get first the even rows, odd columns */
output[(2*m)*w+ 2*i+1] = green_out[m*w +i];
/* and then, the greens on odd rows, even columns. */
output[(2*m+1)*w+ 2*i] = green_out[(2*m+1)*w/2 +i];
}
}
/* De-mirroring for some models */
switch(model) {
case(SQ_MODEL_MAGPIX):
case(SQ_MODEL_POCK_CAM):
for (i = 0; i < h; i++) {
for (m = 0 ; m < w/2; m++) {
temp = output[w*i +m];
output[w*i + m] = output[w*i + w -1 -m];
output[w*i + w - 1 - m] = temp;
}
}
break;
default: ; /* default is "do nothing" */
}
free (red_out);
free (green_out);
free (blue_out);
return(GP_OK);
}
int decode_panel (unsigned char *panel_out, unsigned char *panel,
int panelwidth, int height, int color) {
/* Here, "panelwidth" signifies width of panel_out
* which is w/2, and height equals h */
int diff = 0;
int tempval = 0;
int i, m;
unsigned char delta_left = 0;
unsigned char delta_right = 0;
int input_counter = 0;
int delta_table[] = {-144,-110,-77,-53,-35,-21,-11,-3,
2,10,20,34,52,76,110,144};
unsigned char *temp_line;
temp_line = malloc(panelwidth);
if (!temp_line)
return -1;
for(i=0; i < panelwidth; i++){
temp_line[i] = 0x80;
}
if (color != GREEN) {
for (m=0; m < height; m++) {
for (i=0; i< panelwidth/2; i++) {
delta_left = panel[input_counter] &0x0f;
delta_right = (panel[input_counter]>>4)&0xff;
input_counter ++;
/* left pixel */
diff = delta_table[delta_left];
if (!i)
tempval = (temp_line[2*i]) + diff;
else
tempval = (temp_line[2*i]
+ panel_out[m*panelwidth+2*i-1])/2 + diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
panel_out[m*panelwidth+2*i] = tempval;
temp_line[2*i] = panel_out[m*panelwidth + 2*i];
/* right pixel */
diff = delta_table[delta_right];
tempval = (temp_line[2*i+1]
+ panel_out[m*panelwidth+2*i])/2 + diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
panel_out[m*panelwidth+2*i+1] = tempval;
temp_line[2*i+1] = panel_out[m*panelwidth + 2*i+1];
}
}
return 0;
} else { /* greens */
for (m=0; m < height/2; m++) {
/* First we do an even line */
for (i=0; i< panelwidth/2; i++) {
delta_left = panel[input_counter] &0x0f;
delta_right = (panel[input_counter]>>4)&0xff;
input_counter ++;
/* left pixel */
diff = delta_table[delta_left];
if (!i)
tempval = (temp_line[0]+temp_line[1])/2 + diff;
else
tempval = (temp_line[2*i+1]
+ panel_out[2*m*panelwidth+2*i-1])/2 + diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
panel_out[2*m*panelwidth+2*i] = tempval;
temp_line[2*i] = tempval;
/* right pixel */
diff = delta_table[delta_right];
if (2*i == panelwidth - 2 )
tempval = (temp_line[2*i+1]
+ panel_out
[2*m*panelwidth+2*i])/2
+ diff;
else
tempval = (temp_line[2*i+2]
+ panel_out
[2*m*panelwidth+2*i])/2
+ diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
panel_out[2*m*panelwidth+2*i+1] = tempval;
temp_line[2*i+1] = tempval;
}
/* then an odd line */
for (i=0; i< panelwidth/2; i++) {
delta_left = panel[input_counter] &0x0f;
delta_right = (panel[input_counter]>>4)&0xff;
input_counter ++;
/* left pixel */
diff = delta_table[delta_left];
if (!i)
tempval = (temp_line[2*i]) + diff;
else
tempval = (temp_line[2*i]
+ panel_out
[(2*m+1)*panelwidth+2*i-1])/2
+ diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
panel_out[(2*m+1)*panelwidth+2*i] = tempval;
temp_line[2*i] = tempval;
/* right pixel */
diff = delta_table[delta_right];
tempval = (temp_line[2*i+1]
+ panel_out[(2*m+1)*panelwidth+2*i])/2
+ diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
panel_out[(2*m+1)*panelwidth+2*i+1] = tempval;
temp_line[2*i+1] = tempval;
}
}
return GP_OK;
}
}
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