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#include "backend.h"
#include "bitmap.h"
#include "image.h"
#include "source.h"
#include "source_private.h"
#include <stdlib.h>
#include <string.h>
#include <tiffio.h>
struct private {
TIFF *tiff;
void *data;
size_t pos, len;
int width;
int height;
};
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 free_private(void *raw_private)
{
if (!raw_private) {
return;
}
struct private *private = raw_private;
TIFFClose(private->tiff);
private->tiff = 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;
/* 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(private->height * private->width * 4);
int rcode = TIFFReadRGBAImageOriented(private->tiff, private->width, private->height,
bitmap, ORIENTATION_TOPLEFT, 0);
/* 1 = success, unlike the rest of *nix */
if (rcode != 1) {
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;
TIFFSetErrorHandler(NULL);
private.tiff = TIFFOpen(path, "r");
if (!private.tiff) {
/* Header is read, so no BAD_PATH check here */
return BACKEND_UNSUPPORTED;
}
TIFFGetField(private.tiff, TIFFTAG_IMAGEWIDTH, &private.width);
TIFFGetField(private.tiff, TIFFTAG_IMAGELENGTH, &private.height);
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 = 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;
}
TIFFGetField(private->tiff, TIFFTAG_IMAGEWIDTH, &private->width);
TIFFGetField(private->tiff, TIFFTAG_IMAGELENGTH, &private->height);
*src = imv_source_create(&vtable, private);
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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