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#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <jpeglib.h>
#include "jpeg/transupp.h" /* Support routines for jpegtran */
#include "jpegtools.h"
#include "misc.h"
#include "readers.h"
#include "filter.h"
#include "genthumbnail.h"
/* ---------------------------------------------------------------------- */
static struct ida_image*
read_jpeg(char *filename)
{
struct ida_image *img;
FILE *fp;
unsigned int y;
void *data;
/* open file */
if (NULL == (fp = fopen(filename, "r"))) {
fprintf(stderr,"open %s: %s\n",filename,strerror(errno));
return NULL;
}
/* load image */
img = malloc(sizeof(*img));
memset(img,0,sizeof(*img));
data = jpeg_loader.init(fp,filename,0,&img->i,0);
if (NULL == data) {
fprintf(stderr,"loading %s [%s] FAILED\n",filename,jpeg_loader.name);
free(img);
return NULL;
}
img->data = malloc(img->i.width * img->i.height * 3);
for (y = 0; y < img->i.height; y++)
jpeg_loader.read(img->data + img->i.width * 3 * y, y, data);
jpeg_loader.done(data);
return img;
}
/* ---------------------------------------------------------------------- */
static struct ida_image*
scale_thumbnail(struct ida_image *src, int max)
{
struct op_resize_parm p;
struct ida_rect rect;
struct ida_image *dest;
void *data;
unsigned int y;
float xs,ys,scale;
xs = (float)max / src->i.width;
ys = (float)max / src->i.height;
scale = (xs < ys) ? xs : ys;
dest = malloc(sizeof(*dest));
memset(dest,0,sizeof(*dest));
memset(&rect,0,sizeof(rect));
memset(&p,0,sizeof(p));
p.width = src->i.width * scale;
p.height = src->i.height * scale;
p.dpi = src->i.dpi;
if (0 == p.width)
p.width = 1;
if (0 == p.height)
p.height = 1;
data = desc_resize.init(src,&rect,&dest->i,&p);
dest->data = malloc(dest->i.width * dest->i.height * 3);
for (y = 0; y < dest->i.height; y++)
desc_resize.work(src,&rect,
dest->data + 3 * dest->i.width * y,
y, data);
desc_resize.done(data);
return dest;
}
/* ---------------------------------------------------------------------- */
struct thc {
struct jpeg_compress_struct dst;
struct jpeg_error_mgr err;
unsigned char *out;
int osize;
};
static void thc_dest_init(struct jpeg_compress_struct *cinfo)
{
struct thc *h = container_of(cinfo, struct thc, dst);
cinfo->dest->next_output_byte = h->out;
cinfo->dest->free_in_buffer = h->osize;
}
static boolean thc_dest_flush(struct jpeg_compress_struct *cinfo)
{
fprintf(stderr,"jpeg: panic: output buffer full\n");
exit(1);
}
static void thc_dest_term(struct jpeg_compress_struct *cinfo)
{
struct thc *h = container_of(cinfo, struct thc, dst);
h->osize -= cinfo->dest->free_in_buffer;
}
static struct jpeg_destination_mgr thumbnail_dst = {
.init_destination = thc_dest_init,
.empty_output_buffer = thc_dest_flush,
.term_destination = thc_dest_term,
};
static int
compress_thumbnail(struct ida_image *img, char *dest, int max)
{
struct thc thc;
unsigned char *line;
unsigned int i;
memset(&thc,0,sizeof(thc));
thc.dst.err = jpeg_std_error(&thc.err);
jpeg_create_compress(&thc.dst);
thc.dst.dest = &thumbnail_dst;
thc.out = dest;
thc.osize = max;
thc.dst.image_width = img->i.width;
thc.dst.image_height = img->i.height;
thc.dst.input_components = 3;
thc.dst.in_color_space = JCS_RGB;
jpeg_set_defaults(&thc.dst);
jpeg_start_compress(&thc.dst, TRUE);
for (i = 0, line = img->data; i < img->i.height; i++, line += img->i.width*3)
jpeg_write_scanlines(&thc.dst, &line, 1);
jpeg_finish_compress(&(thc.dst));
jpeg_destroy_compress(&(thc.dst));
return thc.osize;
}
/* ---------------------------------------------------------------------- */
int create_thumbnail(char *filename, char *dest, int max)
{
struct ida_image *img,*thumb;
int size;
//fprintf(stderr,"%s: read ",filename);
img = read_jpeg(filename);
if (!img) {
fprintf(stderr,"FAILED\n");
return -1;
}
//fprintf(stderr,"scale ");
thumb = scale_thumbnail(img,160);
if (!thumb) {
free(img->data);
free(img);
fprintf(stderr,"FAILED\n");
return -1;
}
//fprintf(stderr,"compress ");
size = compress_thumbnail(thumb,dest,max);
/* cleanup */
free(img->data);
free(img);
free(thumb->data);
free(thumb);
return size;
}
/* ---------------------------------------------------------------------- */
#if 0
#define THUMB_MAX 65536
static int handle_image(char *filename)
{
char *dest;
int size;
dest = malloc(THUMB_MAX);
size = create_thumbnail(filename,dest,THUMB_MAX);
fprintf(stderr,"transform ");
jpeg_transform_inplace(filename, JXFORM_NONE, NULL,
dest, size, JFLAG_UPDATE_THUMBNAIL);
fprintf(stderr,"done\n");
return 0;
}
int main(int argc, char *argv[])
{
int i;
for (i = 1; i < argc; i++)
handle_image(argv[i]);
return 0;
}
#endif
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