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/*
* Copyright (C) 2021 The Geeqie Team
*
* Authors: Colin Clark
*
* 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
* This uses libraw to extract a thumbnail from a raw image. The exiv2 library
* does not (yet) extract thumbnails from .cr3 images.
* LibRaw seems to be slower than exiv2, so let exiv2 have priority.
*/
#include "image-load-libraw.h"
#include <config.h>
#if HAVE_RAW
#include <sys/mman.h>
#include <cstddef>
#include <libraw/libraw.h>
#include "filefilter.h"
#include "ui-fileops.h"
struct UnmapData
{
guchar *ptr;
guchar *map_data;
size_t map_len;
LibRaw *lr;
};
static GList *libraw_unmap_list = nullptr;
void libraw_free_preview(const guchar *buf)
{
GList *work = libraw_unmap_list;
while (work)
{
auto ud = static_cast<UnmapData *>(work->data);
if (ud->ptr == buf)
{
munmap(ud->map_data, ud->map_len);
delete ud->lr;
g_free(ud);
libraw_unmap_list = g_list_delete_link(libraw_unmap_list, work);
return;
}
work = work->next;
}
g_assert_not_reached();
}
guchar *libraw_get_preview(const gchar *path, gsize &data_len)
{
if (!filter_file_class(path, FORMAT_CLASS_RAWIMAGE)) return nullptr;
size_t map_len;
guchar *map_data = map_file(path, map_len);
if (!map_data)
{
return nullptr;
}
auto lr = std::make_unique<LibRaw>();
int ret = lr->open_buffer(map_data, map_len);
if (ret == LIBRAW_SUCCESS)
{
ret = lr->unpack_thumb();
if (ret == LIBRAW_SUCCESS && lr->is_jpeg_thumb())
{
auto *ud = g_new(UnmapData, 1);
ud->ptr = reinterpret_cast<guchar *>(lr->imgdata.thumbnail.thumb);
ud->map_data = map_data;
ud->map_len = map_len;
ud->lr = lr.release();
libraw_unmap_list = g_list_prepend(libraw_unmap_list, ud);
data_len = ud->lr->imgdata.thumbnail.tlength;
return ud->ptr;
}
}
munmap(map_data, map_len);
return nullptr;
}
#else /* !define HAVE_RAW */
void libraw_free_preview(const guchar *)
{
}
guchar *libraw_get_preview(const gchar *, gsize &)
{
return nullptr;
}
#endif
/* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */
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