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f41df32817aeaefec64d800412fe9069e1979cb9
libgphoto2/camlibs/digigr8/digi_postprocess.c
axxel f41df32817 fix white-space and indentation inconsistencies (second round) 
This is basically a continuation of the work from #1002 but her for the
camlibs directory. The purpose was to replace spaces as a means for
indentation with tab characters.

Note: there are some files which are still offending the general
rule but are (mostly) consistent within themselves. I let them be for
the moment. Fixing them would basically replace the whole file.

Also: there are still a ton of whitespace related inconsistencies like
"x=10" vs "x = 10" or "func(10)" vs "func (10)".

This is a whitespace only change (if you include newlines as whitespace).
2024-09-15 10:53:41 +02:00

514 lines
13 KiB
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/*
* postprocess.c
*
* Here are the decompression function for the compressed photos and the
* postprocessing for uncompressed photos.
*
* Copyright (c) 2005 and 2007 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>
#include <gphoto2/gphoto2.h>
#include <gphoto2/gphoto2-port.h>
#include <libgphoto2/gamma.h>
#include "digigr8.h"
#define GP_MODULE "digigr8"
#ifndef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
static int
digi_first_decompress (unsigned char *output, unsigned char *input,
unsigned int outputsize)
{
unsigned char parity = 0;
unsigned char nibble_to_keep[2];
unsigned char temp1 = 0, temp2 = 0;
unsigned char input_byte;
unsigned char lookup = 0;
unsigned int i = 0;
unsigned int bytes_used = 0;
unsigned int bytes_done = 0;
unsigned int bit_counter = 8;
unsigned int cycles = 0;
int table[9] = { -1, 0, 2, 6, 0x0e, 0x0e, 0x0e, 0x0e, 0xfb};
unsigned char lookup_table[16] =
{0, 2, 6, 0x0e, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4,
0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb};
unsigned char translator[16] =
{8, 7, 9, 6, 10, 11, 12, 13, 14, 15, 5, 4, 3, 2, 1, 0};
GP_DEBUG ("Running first_decompress.\n");
nibble_to_keep[0] = 0;
nibble_to_keep[1] = 0;
while (bytes_done < outputsize) {
while (parity < 2 ) {
while ( lookup > table[cycles]) {
if (bit_counter == 8) {
input_byte = input[bytes_used];
bytes_used ++;
temp1 = input_byte;
bit_counter = 0;
}
input_byte = temp1;
temp2 = (temp2 << 1) & 0xFF;
input_byte = input_byte >> 7;
temp2 = temp2 | input_byte;
temp1 = (temp1 <<1) & 0xFF;
bit_counter ++ ;
cycles ++ ;
if (cycles > 8) {
GP_DEBUG ("Too many cycles?\n");
return GP_ERROR;
}
lookup = temp2 & 0xff;
}
temp2 = 0;
for (i=0; i < 17; i++ ) {
if (i == 16) {
GP_DEBUG(
"Illegal lookup value during decomp\n");
return GP_ERROR;
}
if (lookup == lookup_table[i] ) {
nibble_to_keep[parity] = translator[i];
break;
}
}
cycles = 0;
parity ++ ;
}
output[bytes_done] = (nibble_to_keep[0] << 4)
| nibble_to_keep[1];
bytes_done++;
parity = 0;
}
GP_DEBUG ("bytes_used = 0x%x = %i\n", bytes_used, bytes_used);
return GP_OK;
}
static int
digi_second_decompress (unsigned char *uncomp, unsigned char *in,
int width, int height)
{
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 *templine_red;
unsigned char *templine_green;
unsigned char *templine_blue;
templine_red = malloc(width);
if (!templine_red) {
return GP_ERROR_NO_MEMORY;
}
for(i=0; i < width; i++)
templine_red[i] = 0x80;
templine_green = malloc(width);
if (!templine_green) {
free (templine_red);
return GP_ERROR_NO_MEMORY;
}
for(i=0; i < width; i++)
templine_green[i] = 0x80;
templine_blue = malloc(width);
if (!templine_blue) {
free (templine_red);
free (templine_green);
return GP_ERROR_NO_MEMORY;
}
for(i=0; i < width; i++)
templine_blue[i] = 0x80;
GP_DEBUG ("Running second_decompress.\n");
for (m = 0; m < height / 2; m++) {
/* First we do an even-numbered line */
for (i = 0; i < width / 2; i++) {
delta_right = in[input_counter] & 0x0f;
delta_left = (in[input_counter] >> 4) & 0xff;
input_counter++;
/* left pixel (red) */
diff = delta_table[delta_left];
if (!i)
tempval = templine_red[0] + diff;
else
tempval = (templine_red[i]
+ uncomp[2 *m * width + 2 * i - 2]) / 2
+ diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
uncomp[2 * m * width + 2 * i] = tempval;
templine_red[i] = tempval;
/* right pixel (green) */
diff = delta_table[delta_right];
if (!i)
tempval = templine_green[1] + diff;
else if (2 * i == width - 2 )
tempval = (templine_green[i]
+ uncomp[2 * m * width + 2 * i -1]) / 2
+ diff;
else
tempval = (templine_green[i + 1]
+ uncomp[2 * m * width + 2 * i - 1]) / 2
+ diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
uncomp[2 * m * width + 2 * i + 1] = tempval;
templine_green[i] = tempval;
}
/* then an odd-numbered line */
for (i = 0; i < width / 2; i++) {
delta_right = in[input_counter] &0x0f;
delta_left = (in[input_counter] >> 4) & 0xff;
input_counter++;
/* left pixel (green) */
diff = delta_table[delta_left];
if (!i)
tempval = templine_green[0] + diff;
else
tempval = (templine_green[i]
+ uncomp[(2 * m + 1) * width
+ 2 * i - 2]) / 2 + diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
uncomp[(2 * m + 1) * width + 2 * i] = tempval;
templine_green[i] = tempval;
/* right pixel (blue) */
diff = delta_table[delta_right];
if (!i)
tempval = templine_blue[0] + diff;
else
tempval = (templine_blue[i]
+ uncomp[(2 * m + 1) * width
+ 2 * i - 1]) / 2 + diff;
tempval = MIN(tempval, 0xff);
tempval = MAX(tempval, 0);
uncomp[(2 * m + 1) * width + 2 * i + 1] = tempval;
templine_blue[i] = tempval;
}
}
free(templine_green);
free(templine_red);
free(templine_blue);
return GP_OK;
}
int
digi_decompress (unsigned char *out_data, unsigned char *data,
int w, int h)
{
int size;
unsigned char *temp_data;
size = w * h / 2;
temp_data = malloc(size);
if (!temp_data)
return GP_ERROR_NO_MEMORY;
digi_first_decompress (temp_data, data, size);
GP_DEBUG("Stage one done\n");
digi_second_decompress (out_data, temp_data, w, h);
GP_DEBUG("Stage two done\n");
free(temp_data);
return(GP_OK);
}
/* Brightness correction routine adapted from
* camlibs/polaroid/jd350e.c, copyright © 2001 Michael Trawny
* <trawny99@users.sourceforge.net>
*/
#define RED(p,x,y,w) *((p)+3*((y)*(w)+(x)) )
#define GREEN(p,x,y,w) *((p)+3*((y)*(w)+(x))+1)
#define BLUE(p,x,y,w) *((p)+3*((y)*(w)+(x))+2)
#define MINMAX(a,min,max) { (min)=MIN(min,a); (max)=MAX(max,a); }
#ifndef MAX
# define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#ifndef CLAMP
#define CLAMP(x) ((x)<0?0:((x)>255)?255:(x))
#endif
int
digi_postprocess(int width, int height,
unsigned char* rgb)
{
int
x,y,
red_min=255, red_max=0,
blue_min=255, blue_max=0,
green_min=255, green_max=0;
double
min, max, amplify;
/* determine min and max per color... */
for( y=0; y<height; y++){
for( x=0; x<width; x++ ){
MINMAX( RED(rgb,x,y,width), red_min, red_max );
MINMAX( GREEN(rgb,x,y,width), green_min, green_max);
MINMAX( BLUE(rgb,x,y,width), blue_min, blue_max );
}
}
/* determine min and max per color... */
for( y=0; y<height; y++){
for( x=0; x<width; x++ ){
MINMAX( RED(rgb , x , y, width), red_min, red_max);
MINMAX( GREEN(rgb, x, y, width), green_min, green_max);
MINMAX( BLUE(rgb, x, y, width), blue_min, blue_max);
}
}
/* Normalize brightness ... */
max = MAX( MAX( red_max, green_max ), blue_max);
min = MIN( MIN( red_min, green_min ), blue_min);
amplify = 255.0/(max-min);
for (y = 0; y < height; y++){
for(x = 0; x < width; x++ ){
RED(rgb, x, y, width)= MIN(amplify *
(double)(RED(rgb, x, y, width) - min), 255);
GREEN(rgb, x, y, width)= MIN(amplify *
(double)(GREEN(rgb, x, y, width) - min), 255);
BLUE(rgb, x, y, width)= MIN(amplify *
(double)(BLUE(rgb, x, y, width) -min), 255);
}
}
return GP_OK;
}
/* ===== White Balance / Color Enhance / Gamma adjust (experimental) =====
Get histogram for each color plane
Expand to reach 0.5% of white dots in image
Get new histogram for each color plane
Expand to reach 0.5% of black dots in image
Get new histogram
Calculate and apply gamma correction
if not a dark image:
For each dot, increases color separation
===================================================================== */
static int
histogram (unsigned char *data, unsigned int size, int *htable_r,
int *htable_g, int *htable_b)
{
unsigned int x;
/* Initializations */
for (x = 0; x < 0x100; x++) {
htable_r[x] = 0;
htable_g[x] = 0;
htable_b[x] = 0;
}
/* Building the histograms */
for (x = 0; x < (size * 3); x += 3)
{
htable_r[data[x + 0]]++; /* red histogram */
htable_g[data[x + 1]]++; /* green histogram */
htable_b[data[x + 2]]++; /* blue histogram */
}
return GP_OK;
}
int
white_balance (unsigned char *data, unsigned int size, float saturation)
{
unsigned int x, max;
int r, g, b, d;
double r_factor, g_factor, b_factor, max_factor;
int htable_r[0x100], htable_g[0x100], htable_b[0x100];
unsigned char gtable[0x100];
double new_gamma, gamma=1.0;
/* ------------------- GAMMA CORRECTION ------------------- */
histogram(data, size, htable_r, htable_g, htable_b);
x = 1;
for (r = 64; r < 192; r++)
{
x += htable_r[r];
x += htable_g[r];
x += htable_b[r];
}
new_gamma = sqrt((double) (x * 1.5) / (double) (size * 3));
GP_DEBUG("Provisional gamma correction = %1.2f\n", new_gamma);
/* Recalculate saturation factor for later use. */
saturation = saturation * new_gamma * new_gamma;
GP_DEBUG("saturation = %1.2f\n", saturation);
gamma = new_gamma;
if (new_gamma < .70) gamma = 0.70;
if (new_gamma > 1.2) gamma = 1.2;
GP_DEBUG("Gamma correction = %1.2f\n", gamma);
gp_gamma_fill_table(gtable, gamma);
gp_gamma_correct_single(gtable,data,size);
if (saturation < .5 ) /* If so, exit now. */
return GP_OK;
/* ---------------- BRIGHT DOTS ------------------- */
max = size / 200;
histogram(data, size, htable_r, htable_g, htable_b);
for (r = 0xfe, x = 0; (r > 32) && (x < max); r--)
x += htable_r[r];
for (g = 0xfe, x = 0; (g > 32) && (x < max); g--)
x += htable_g[g];
for (b = 0xfe, x = 0; (b > 32) && (x < max); b--)
x += htable_b[b];
r_factor = (double) 0xfd / r;
g_factor = (double) 0xfd / g;
b_factor = (double) 0xfd / b;
max_factor = r_factor;
if (g_factor > max_factor) max_factor = g_factor;
if (b_factor > max_factor) max_factor = b_factor;
if (max_factor >= 4.0) {
/* We need a little bit of control, here. If max_factor > 4 the photo
* was very dark, after all.
*/
if (2.0 * b_factor < max_factor)
b_factor = max_factor / 2.;
if (2.0 * r_factor < max_factor)
r_factor = max_factor / 2.;
if (2.0 * g_factor < max_factor)
g_factor = max_factor / 2.;
r_factor = (r_factor / max_factor) * 4.0;
g_factor = (g_factor / max_factor) * 4.0;
b_factor = (b_factor / max_factor) * 4.0;
}
if (max_factor > 1.5)
saturation = 0;
GP_DEBUG("White balance (bright): r=%1d, g=%1d, b=%1d, \
r_factor=%1.3f, g_factor=%1.3f, b_factor=%1.3f\n",
r, g, b, r_factor, g_factor, b_factor);
if (max_factor <= 1.4) {
for (x = 0; x < (size * 3); x += 3)
{
d = (data[x + 0] << 8) * r_factor + 8;
d >>= 8;
if (d > 0xff)
d = 0xff;
data[x + 0] = d;
d = (data[x + 1] << 8) * g_factor + 8;
d >>= 8;
if (d > 0xff) { d = 0xff; }
data[x + 1] = d;
d = (data[x + 2] << 8) * b_factor + 8;
d >>= 8;
if (d > 0xff)
d = 0xff;
data[x + 2] = d;
}
}
/* ---------------- DARK DOTS ------------------- */
max = size / 200; /* 1/200 = 0.5% */
histogram(data, size, htable_r, htable_g, htable_b);
for (r = 0, x = 0; r < 96 && x < max; r++)
x += htable_r[r];
for (g = 0, x = 0; g < 96 && x < max; g++)
x += htable_g[g];
for (b = 0, x = 0; b < 96 && x < max; b++)
x += htable_b[b];
r_factor = (double) 0xfe / (0xff - r);
g_factor = (double) 0xfe / (0xff - g);
b_factor = (double) 0xfe / (0xff - b);
GP_DEBUG(
"White balance (dark): r=%1d, g=%1d, b=%1d, \
r_factor=%1.3f, g_factor=%1.3f, b_factor=%1.3f\n",
r, g, b, r_factor, g_factor, b_factor);
for (x = 0; x < (size * 3); x += 3)
{
d = (int) 0xff08 - (((0xff - data[x + 0]) << 8) * r_factor);
d >>= 8;
if (d < 0)
d = 0;
data[x + 0] = d;
d = (int) 0xff08 - (((0xff - data[x + 1]) << 8) * g_factor);
d >>= 8;
if (d < 0)
d = 0;
data[x + 1] = d;
d = (int) 0xff08 - (((0xff - data[x + 2]) << 8) * b_factor);
d >>= 8;
if (d < 0)
d = 0;
data[x+2] = d;
}
/* ------------------ COLOR ENHANCE ------------------ */
if(saturation > 0.0) {
for (x = 0; x < (size * 3); x += 3)
{
r = data[x+0]; g = data[x+1]; b = data[x+2];
d = (int) (r + g + b) / 3.;
if ( r > d )
r = r + (int) ((r - d) * (0xff - r)
/(0x100 - d) * saturation);
else
r = r + (int) ((r - d) * (0xff - d)
/ (0x100 - r) * saturation);
if (g > d)
g = g + (int) ((g - d) * (0xff - g)
/ (0x100 - d) * saturation);
else
g = g + (int) ((g - d) * (0xff - d)
/ (0x100 - g) * saturation);
if (b > d)
b = b + (int) ((b - d) * (0xff - b)
/(0x100 - d) * saturation);
else
b = b + (int) ((b - d) * (0xff - d)
/(0x100 - b) * saturation);
data[x+0] = CLAMP(r);
data[x+1] = CLAMP(g);
data[x+2] = CLAMP(b);
}
}
return GP_OK;
}
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