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#include "backend.h"
#include "bitmap.h"
#include "image.h"
#include "source.h"
#include "source_private.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <turbojpeg.h>
struct private {
int fd;
void *data;
size_t len;
tjhandle jpeg;
int width;
int height;
};
static void free_private(void *raw_private)
{
if (!raw_private) {
return;
}
struct private *private = raw_private;
tjDestroy(private->jpeg);
if (private->fd >= 0) {
munmap(private->data, private->len);
close(private->fd);
} else {
free(private->data);
}
private->data = NULL;
free(private);
}
static void load_image(void *raw_private, struct imv_image **image, int *frametime)
{
*image = NULL;
*frametime = 0;
struct private *private = raw_private;
void *bitmap = malloc(private->height * private->width * 4);
int rcode = tjDecompress2(private->jpeg, private->data, private->len,
bitmap, private->width, 0, private->height, TJPF_RGBA, TJFLAG_FASTDCT);
if (rcode) {
free(bitmap);
return;
}
struct imv_bitmap *bmp = malloc(sizeof *bmp);
bmp->width = private->width;
bmp->height = private->height;
bmp->format = IMV_ABGR;
bmp->data = bitmap;
*image = imv_image_create_from_bitmap(bmp);
}
static const struct imv_source_vtable vtable = {
.load_first_frame = load_image,
.free = free_private
};
static enum backend_result open_path(const char *path, struct imv_source **src)
{
struct private private;
private.fd = open(path, O_RDONLY);
if (private.fd < 0) {
return BACKEND_BAD_PATH;
}
off_t len = lseek(private.fd, 0, SEEK_END);
if (len < 0) {
close(private.fd);
return BACKEND_BAD_PATH;
}
private.len = len;
private.data = mmap(NULL, private.len, PROT_READ, MAP_PRIVATE, private.fd, 0);
if (private.data == MAP_FAILED || !private.data) {
close(private.fd);
return BACKEND_BAD_PATH;
}
private.jpeg = tjInitDecompress();
if (!private.jpeg) {
munmap(private.data, private.len);
close(private.fd);
return BACKEND_UNSUPPORTED;
}
int rcode = tjDecompressHeader(private.jpeg, private.data, private.len,
&private.width, &private.height);
if (rcode) {
tjDestroy(private.jpeg);
munmap(private.data, private.len);
close(private.fd);
return BACKEND_UNSUPPORTED;
}
struct private *new_private = malloc(sizeof private);
memcpy(new_private, &private, sizeof private);
*src = imv_source_create(&vtable, new_private);
return BACKEND_SUCCESS;
}
static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
{
struct private private;
private.fd = -1;
private.data = data;
private.len = len;
private.jpeg = tjInitDecompress();
if (!private.jpeg) {
return BACKEND_UNSUPPORTED;
}
int rcode = tjDecompressHeader(private.jpeg, private.data, private.len,
&private.width, &private.height);
if (rcode) {
tjDestroy(private.jpeg);
return BACKEND_UNSUPPORTED;
}
struct private *new_private = malloc(sizeof private);
memcpy(new_private, &private, sizeof private);
*src = imv_source_create(&vtable, new_private);
return BACKEND_SUCCESS;
}
const struct imv_backend imv_backend_libjpeg = {
.name = "libjpeg-turbo",
.description = "Fast JPEG codec based on libjpeg. "
"This software is based in part on the work "
"of the Independent JPEG Group.",
.website = "https://libjpeg-turbo.org/",
.license = "The Modified BSD License",
.open_path = &open_path,
.open_memory = &open_memory,
};
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