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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/** \file
* \ingroup blendthumb
*
* This file defines the thumbnail generation command (typically used on UNIX).
*
* To run automatically with a file manager such as Nautilus, save this file
* in a directory that is listed in PATH environment variable, and create
* `blender.thumbnailer` file in `${HOME}/.local/share/thumbnailers/` directory
* with the following contents:
*
* \code{.txt}
* [Thumbnailer Entry]
* TryExec=blender-thumbnailer
* Exec=blender-thumbnailer %u %o
* MimeType=application/x-blender;
* \endcode
*/
#include <fstream>
#include <optional>
#include <fcntl.h>
#ifndef WIN32
# include <unistd.h> /* For read close. */
#else
# include "BLI_winstuff.h"
# include "winsock2.h"
# include <io.h> /* For open close read. */
#endif
#include "BLI_fileops.h"
#include "BLI_filereader.h"
#include "BLI_vector.hh"
#include "blendthumb.hh"
/**
* This function opens .blend file from src_blend, extracts thumbnail from file if there is one,
* and writes `.png` image into `dst_png`.
* Returns exit code (0 if successful).
*/
static eThumbStatus extract_png_from_blend_file(const char *src_blend, const char *dst_png)
{
eThumbStatus err;
/* Open source file `src_blend`. */
const int src_file = BLI_open(src_blend, O_BINARY | O_RDONLY, 0);
if (src_file == -1) {
return BT_FILE_ERR;
}
/* Thumbnail reading is responsible for freeing `file` and closing `src_file`. */
FileReader *file = BLI_filereader_new_file(src_file);
if (file == nullptr) {
close(src_file);
return BT_FILE_ERR;
}
/* Extract thumbnail from file. */
Thumbnail thumb;
err = blendthumb_create_thumb_from_file(file, &thumb);
if (err != BT_OK) {
return err;
}
/* Write thumbnail to `dst_png`. */
const int dst_file = BLI_open(dst_png, O_BINARY | O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (dst_file == -1) {
return BT_FILE_ERR;
}
std::optional<blender::Vector<uint8_t>> png_buf_opt = blendthumb_create_png_data_from_thumb(
&thumb);
if (png_buf_opt == std::nullopt) {
err = BT_ERROR;
}
else {
blender::Vector<uint8_t> png_buf = *png_buf_opt;
err = (write(dst_file, png_buf.data(), png_buf.size()) == png_buf.size()) ? BT_OK :
BT_FILE_ERR;
}
close(dst_file);
return err;
}
int main(int argc, char *argv[])
{
if (argc < 3) {
std::cerr << "Usage: blender-thumbnailer <input.blend> <output.png>" << std::endl;
return -1;
}
eThumbStatus ret = extract_png_from_blend_file(argv[1], argv[2]);
return (int)ret;
}
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