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#include "backend.h"
#include "source.h"
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <tiffio.h>
struct private {
TIFF *tiff;
void *data;
size_t pos, len;
};
static tsize_t mem_read(thandle_t data, tdata_t buffer, tsize_t len)
{
struct private *private = (struct private*)data;
memcpy(buffer, (char*)private->data + private->pos, len);
private->pos += len;
return len;
}
static tsize_t mem_write(thandle_t data, tdata_t buffer, tsize_t len)
{
struct private *private = (struct private*)data;
memcpy((char*)private->data + private->pos, buffer, len);
private->pos += len;
return len;
}
static int mem_close(thandle_t data)
{
(void)data;
return 0;
}
static toff_t mem_seek(thandle_t data, toff_t pos, int whence)
{
struct private *private = (struct private*)data;
if (whence == SEEK_SET) {
private->pos = pos;
} else if (whence == SEEK_CUR) {
private->pos += pos;
} else if (whence == SEEK_END) {
private->pos = private->len + pos;
} else {
return -1;
}
return private->pos;
}
static toff_t mem_size(thandle_t data)
{
struct private *private = (struct private*)data;
return private->len;
}
static void source_free(struct imv_source *src)
{
pthread_mutex_lock(&src->busy);
free(src->name);
src->name = NULL;
struct private *private = src->private;
TIFFClose(private->tiff);
private->tiff = NULL;
free(src->private);
src->private = NULL;
pthread_mutex_unlock(&src->busy);
pthread_mutex_destroy(&src->busy);
free(src);
}
static struct imv_image *to_image(int width, int height, void *bitmap)
{
struct imv_bitmap *bmp = malloc(sizeof *bmp);
bmp->width = width;
bmp->height = height;
bmp->format = IMV_ABGR;
bmp->data = bitmap;
struct imv_image *image = imv_image_create_from_bitmap(bmp);
return image;
}
static void report_error(struct imv_source *src)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = NULL;
msg.error = "Internal error";
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void send_bitmap(struct imv_source *src, void *bitmap)
{
assert(src->callback);
struct imv_source_message msg;
msg.source = src;
msg.user_data = src->user_data;
msg.image = to_image(src->width, src->height, bitmap);
msg.frametime = 0;
msg.error = NULL;
pthread_mutex_unlock(&src->busy);
src->callback(&msg);
}
static void *load_image(struct imv_source *src)
{
/* Don't run if this source is already active */
if (pthread_mutex_trylock(&src->busy)) {
return NULL;
}
struct private *private = src->private;
/* libtiff suggests using their own allocation routines to support systems
* with segmented memory. I have no desire to support that, so I'm just
* going to use vanilla malloc/free. Systems where that isn't acceptable
* don't have upstream support from imv.
*/
void *bitmap = malloc(src->height * src->width * 4);
int rcode = TIFFReadRGBAImageOriented(private->tiff, src->width, src->height,
bitmap, ORIENTATION_TOPLEFT, 0);
/* 1 = success, unlike the rest of *nix */
if (rcode != 1) {
free(bitmap);
report_error(src);
return NULL;
}
send_bitmap(src, bitmap);
return NULL;
}
static enum backend_result open_path(const char *path, struct imv_source **src)
{
struct private private;
private.tiff = TIFFOpen(path, "r");
if (!private.tiff) {
/* Header is read, so no BAD_PATH check here */
return BACKEND_UNSUPPORTED;
}
unsigned int width, height;
TIFFGetField(private.tiff, TIFFTAG_IMAGEWIDTH, &width);
TIFFGetField(private.tiff, TIFFTAG_IMAGELENGTH, &height);
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup(path);
source->width = width;
source->height = height;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = malloc(sizeof private);
memcpy(source->private, &private, sizeof private);
*src = source;
return BACKEND_SUCCESS;
}
static enum backend_result open_memory(void *data, size_t len, struct imv_source **src)
{
struct private *private = malloc(sizeof *private);
private->data = data;
private->len = len;
private->pos = 0;
private->tiff = TIFFClientOpen("-", "rm", (thandle_t)private,
&mem_read, &mem_write, &mem_seek, &mem_close, &mem_size,
NULL, NULL);
if (!private->tiff) {
/* Header is read, so no BAD_PATH check here */
free(private);
return BACKEND_UNSUPPORTED;
}
unsigned int width, height;
TIFFGetField(private->tiff, TIFFTAG_IMAGEWIDTH, &width);
TIFFGetField(private->tiff, TIFFTAG_IMAGELENGTH, &height);
struct imv_source *source = calloc(1, sizeof *source);
source->name = strdup("-");
source->width = width;
source->height = height;
source->num_frames = 1;
source->next_frame = 1;
pthread_mutex_init(&source->busy, NULL);
source->load_first_frame = &load_image;
source->load_next_frame = NULL;
source->free = &source_free;
source->callback = NULL;
source->user_data = NULL;
source->private = private;
*src = source;
return BACKEND_SUCCESS;
}
const struct imv_backend imv_backend_libtiff = {
.name = "libtiff",
.description = "The de-facto tiff library",
.website = "http://www.libtiff.org/",
.license = "MIT",
.open_path = &open_path,
.open_memory = &open_memory,
};
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