/*
 *		fimg-pnm.c
 *
 *
 */

#include  <stdio.h>
#include  <stdlib.h>
#include  <unistd.h>

#include  "string.h"

#include  "../floatimg.h"

extern int verbosity;		/* must be declared around main() */

/* ---------------------------------------------------------------- */
/* nouveau juin 2019, pendant la Ravebish */

int fimg_load_from_pnm(char *fname, FloatImg *head, int notused)
{ 
FILE		*fp;
int		width, height, maxval;
int		foo, line, column;
unsigned char	*buffline, *idxrd, dummychar;
float		*Rptr, *Gptr, *Bptr;

if (NULL==head) {
	fprintf(stderr, "%s : head ptr is %p\n", __func__, head);
	return -8;
	}

if (NULL==(fp=fopen(fname, "r"))) {
	perror(fname);
	exit(1);
	}

foo = fscanf(fp, "P6 %d %d %d", &width, &height, &maxval);
if (3 != foo) {
	fprintf(stderr, "%s : fscanf -> %d\n", __func__, foo);
	return -1;
	}

if (verbosity) {
	fprintf(stderr, "%s is %dx%d , max=%d\n",fname, width, height, maxval);
	}

if (NULL==(buffline=calloc(3, width))) {
	fprintf(stderr, "%s on %s : memory error\n", __func__, fname);
	return -2;
	}

foo = fimg_create(head, width, height, 3);
if (foo) {
        fprintf(stderr, "%s : create floatimg -> %d\n", __func__, foo);
        exit(1);
        }

#if DEBUG_LEVEL
fread(&dummychar, 1, 1, fp);
fprintf(stderr, "%s : dummychar %xx\n", __func__, dummychar);
#else
fseek(fp, 1L, SEEK_CUR);		/* black magic */
#endif

Rptr = head->R;    Gptr = head->G;    Bptr = head->B;
for (line=0; line<height; line++) {
	foo = fread(buffline, 3, width, fp);
	// fprintf(stderr, "line %d read %d\n", line, width);
	idxrd = buffline;
	for (column=0; column<width; column++)
		{
		*Rptr++ = (float)*idxrd++;
		*Gptr++ = (float)*idxrd++;
		*Bptr++ = (float)*idxrd++;
		}
	}

fclose(fp);

return 0;
}

/* ---------------------------------------------------------------- */
static void dump_gray_values(FILE *fp, FloatImg *picz, float fk)
{
int		cnt, sz, value;
int		idx;

cnt = 0;
sz = picz->width * picz->height;
for (idx=0; idx<sz; idx++) {
	if (fk > 0)	value = (int)(picz->R[idx] / fk);
	else		value = 0;
	cnt += fprintf(fp, "%d", value);
	if (cnt > 70) {
		fputs("\n", fp); 	cnt = 0;
		}
	else	{
		fputs(" ", fp);		cnt++;
		}
	}
fputs("\n", fp);
}
/* ---------------------------------------------------------------- */
static void dump_rgb_values(FILE *fp, FloatImg *picz, float fk)
{
int		cnt, sz, idx;
int		Rv, Gv, Bv;

cnt = 0;
sz = picz->width * picz->height;
for (idx=0; idx<sz; idx++) {
	if (fk > 0) {
		Rv = (int)(picz->R[idx] / fk);
		Gv = (int)(picz->G[idx] / fk);
		Bv = (int)(picz->B[idx] / fk);
		}
	else	{
		Rv = Gv = Bv = 0;
		}
	cnt += fprintf(fp, "%d %d %d", Rv, Gv, Bv);
	if (cnt > 60) {
		fputs("\n", fp); 	cnt = 0;
		}
	else	{
		fputs(" ", fp);		cnt++;
		}
	}
fputs("\n", fp);
}
/* ---------------------------------------------------------------- */
/*
 *		bit 0 of flags : use fvalue/count
 */
int fimg_save_as_pnm(FloatImg *head, char *fname, int flags)
{
FILE		*fp;
float		maximum, fk;
char		*code;

#if DEBUG_LEVEL
fprintf(stderr, ">>> %-25s ( %p '%s' 0x%04x )\n", __func__, head,
						fname, flags);
#endif

if ( head->type != FIMG_TYPE_RGB && head->type != FIMG_TYPE_GRAY) {
#if DEBUG_LEVEL 
	fprintf(stderr, "%s : type %d is bad.\n", __func__, head->type);
#endif
	return -1;
	}

if (NULL==(fp=fopen(fname, "w"))) {
	perror(fname);
	return -2;
	}

switch(head->type) {
	case FIMG_TYPE_GRAY:	code = "P2";		break;
	case FIMG_TYPE_RGB:	code = "P3";		break;
	}

fprintf(fp, "%s\n%d %d\n", code, head->width, head->height);

if ( flags & 1 ) {
	fk = (head->fval * head->count) / 65535.0;
	if (verbosity > 1) {
		fprintf(stderr, "%s using fval/count %f %d -> %f\n",
				__func__,
					head->fval, head->count, fk);
		}
	fprintf(fp, "# fval/count  %f  %d\n", head->fval, head->count);
	}
else	{
	maximum = fimg_get_maxvalue(head);
	fk = maximum / 65535.0;
	fprintf(fp, "# maxval  %15f\n# divisor  %15f\n", maximum, fk);
	}

fprintf(fp, "65535\n");
fflush(fp);

switch(head->type) {
	case FIMG_TYPE_GRAY:
		dump_gray_values(fp, head, fk);
		break;
	case FIMG_TYPE_RGB:
		dump_rgb_values(fp, head, fk);
		break;
	}

fputs("\n", fp);

fclose(fp);

return 0;
}
/* ---------------------------------------------------------------- */