src/image-load-external.cc

   1 /*
   2  * Copyright (C) 2021 - The Geeqie Team
   3  *
   4  * Author: Colin Clark
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include "image-load-external.h"
  22
  23 #include <gdk-pixbuf/gdk-pixbuf.h>
  24 #include <glib-object.h>
  25 #include <glib.h>
  26
  27 #include "filedata.h"
  28 #include "image-load.h"
  29 #include "misc.h"
  30 #include "options.h"
  31 #include "ui-fileops.h"
  32
  33 namespace
  34 {
  35
  36 struct ImageLoaderExternal {
  37         ImageLoaderBackendCbAreaUpdated area_updated_cb;
  38         ImageLoaderBackendCbSize size_cb;
  39         ImageLoaderBackendCbAreaPrepared area_prepared_cb;
  40         gpointer data;
  41         GdkPixbuf *pixbuf;
  42         guint requested_width;
  43         guint requested_height;
  44         gboolean abort;
  45 };
  46
  47 gboolean image_loader_external_write(gpointer loader, const guchar *, gsize &chunk_size, gsize count, GError **)
  48 {
  49         auto ld = static_cast<ImageLoaderExternal *>(loader);
  50         auto il = static_cast<ImageLoader *>(ld->data);
  51         gchar *cmd_line;
  52         gchar *randname;
  53         gchar *tilde_filename;
  54
  55         tilde_filename = expand_tilde(options->external_preview.extract);
  56
  57         randname = g_strdup("/tmp/geeqie_external_preview_XXXXXX");
  58         g_mkstemp(randname);
  59
  60         cmd_line = g_strdup_printf("\"%s\" \"%s\" \"%s\"" , tilde_filename, il->fd->path, randname);
  61
  62         runcmd(cmd_line);
  63
  64         ld->pixbuf = gdk_pixbuf_new_from_file(randname, nullptr);
  65
  66         ld->area_updated_cb(loader, 0, 0, gdk_pixbuf_get_width(ld->pixbuf), gdk_pixbuf_get_height(ld->pixbuf), ld->data);
  67
  68         g_free(cmd_line);
  69         unlink_file(randname);
  70         g_free(randname);
  71         g_free(tilde_filename);
  72
  73         chunk_size = count;
  74         return TRUE;
  75 }
  76
  77 gpointer image_loader_external_new(ImageLoaderBackendCbAreaUpdated area_updated_cb, ImageLoaderBackendCbSize size_cb, ImageLoaderBackendCbAreaPrepared area_prepared_cb, gpointer data)
  78 {
  79         auto loader = g_new0(ImageLoaderExternal, 1);
  80         loader->area_updated_cb = area_updated_cb;
  81         loader->size_cb = size_cb;
  82         loader->area_prepared_cb = area_prepared_cb;
  83         loader->data = data;
  84         return loader;
  85 }
  86
  87 void image_loader_external_set_size(gpointer loader, int width, int height)
  88 {
  89         auto ld = static_cast<ImageLoaderExternal *>(loader);
  90         ld->requested_width = width;
  91         ld->requested_height = height;
  92 }
  93
  94 GdkPixbuf* image_loader_external_get_pixbuf(gpointer loader)
  95 {
  96         auto ld = static_cast<ImageLoaderExternal *>(loader);
  97         return ld->pixbuf;
  98 }
  99
 100 gchar* image_loader_external_get_format_name(gpointer)
 101 {
 102         return g_strdup("external");
 103 }
 104
 105 gchar** image_loader_external_get_format_mime_types(gpointer)
 106 {
 107         static const gchar *mime[] = {"application/octet-stream", nullptr};
 108         return g_strdupv(const_cast<gchar **>(mime));
 109 }
 110
 111 gboolean image_loader_external_close(gpointer, GError **)
 112 {
 113         return TRUE;
 114 }
 115
 116 void image_loader_external_abort(gpointer loader)
 117 {
 118         auto ld = static_cast<ImageLoaderExternal *>(loader);
 119         ld->abort = TRUE;
 120 }
 121
 122 void image_loader_external_free(gpointer loader)
 123 {
 124         auto ld = static_cast<ImageLoaderExternal *>(loader);
 125         if (ld->pixbuf) g_object_unref(ld->pixbuf);
 126         g_free(ld);
 127 }
 128
 129 } // namespace
 130
 131 void image_loader_backend_set_external(ImageLoaderBackend *funcs)
 132 {
 133         funcs->loader_new = image_loader_external_new;
 134         funcs->set_size = image_loader_external_set_size;
 135         funcs->write = image_loader_external_write;
 136         funcs->get_pixbuf = image_loader_external_get_pixbuf;
 137         funcs->close = image_loader_external_close;
 138         funcs->abort = image_loader_external_abort;
 139         funcs->free = image_loader_external_free;
 140         funcs->get_format_name = image_loader_external_get_format_name;
 141         funcs->get_format_mime_types = image_loader_external_get_format_mime_types;
 142 }
 143
 144
 145 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */