static int cb_nbio_generic(nbio_handle_t *nbio, size_t *len)
{
void *ptr = NULL;
if (!nbio->image.handle)
{
nbio->image.cb = NULL;
return -1;
}
ptr = nbio_get_ptr(nbio->handle, len);
if (!ptr)
{
rpng_nbio_load_image_free(nbio->image.handle);
nbio->image.handle = NULL;
nbio->image.cb = NULL;
return -1;
}
rpng_set_buf_ptr(nbio->image.handle, (uint8_t*)ptr);
nbio->image.pos_increment = (*len / 2) ? (*len / 2) : 1;
nbio->image.processing_pos_increment = (*len / 4) ? (*len / 4) : 1;
if (!rpng_nbio_load_image_argb_start(nbio->image.handle))
{
rpng_nbio_load_image_free(nbio->image.handle);
return -1;
}
nbio->image.is_blocking = false;
nbio->image.is_finished = false;
nbio->is_finished = true;
return 0;
}
static bool rpng_load_image_argb(const char *path, uint32_t **data,
unsigned *width, unsigned *height)
{
int retval;
size_t file_len;
bool ret = true;
rpng_t *rpng = NULL;
void *ptr = NULL;
struct nbio_t* handle = (struct nbio_t*)nbio_open(path, NBIO_READ);
if (!handle)
goto end;
nbio_begin_read(handle);
while (!nbio_iterate(handle));
ptr = nbio_get_ptr(handle, &file_len);
if (!ptr)
{
ret = false;
goto end;
}
rpng = rpng_alloc();
if (!rpng)
{
ret = false;
goto end;
}
if (!rpng_set_buf_ptr(rpng, (uint8_t*)ptr))
{
ret = false;
goto end;
}
if (!rpng_start(rpng))
{
ret = false;
goto end;
}
while (rpng_iterate_image(rpng));
if (!rpng_is_valid(rpng))
{
ret = false;
goto end;
}
do
{
retval = rpng_process_image(rpng,
(void**)data, file_len, width, height);
}while(retval == IMAGE_PROCESS_NEXT);
if (retval == IMAGE_PROCESS_ERROR || retval == IMAGE_PROCESS_ERROR_END)
ret = false;
end:
if (handle)
nbio_free(handle);
if (rpng)
rpng_free(rpng);
rpng = NULL;
if (!ret)
free(*data);
return ret;
}
