Adding upstream version 2.10.36.upstream/2.10.36

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

10 files changed, 4220 insertions, 0 deletions

diff --git a/plug-ins/file-ico/Makefile.am b/plug-ins/file-ico/Makefile.am
new file mode 100644
index 0000000..0bc5bbf
--- /dev/null
+++ b/plug-ins/file-ico/Makefile.am
@@ -0,0 +1,57 @@
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+
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+
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+
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+
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+
+file_ico_SOURCES = \
+	ico.c		\
+	ico.h		\
+	ico-dialog.c	\
+	ico-dialog.h	\
+	ico-load.c	\
+	ico-load.h	\
+	ico-save.c	\
+	ico-save.h
+
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+	$(libgimpui)		\
+	$(libgimpwidgets)	\
+	$(libgimpconfig)	\
+	$(libgimp)		\
+	$(libgimpcolor)		\
+	$(libgimpmath)		\
+	$(libgimpbase)		\
+	$(GTK_LIBS)             \
+	$(GEGL_LIBS)		\
+	$(PNG_LIBS)		\
+	$(RT_LIBS)		\
+	$(INTLLIBS)		\
+	$(file_ico_RC)
diff --git a/plug-ins/file-ico/Makefile.in b/plug-ins/file-ico/Makefile.in
new file mode 100644
index 0000000..093fb19
--- /dev/null
+++ b/plug-ins/file-ico/Makefile.in
@@ -0,0 +1,1081 @@
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+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -c -o file_ico-ico-dialog.obj `if test -f 'ico-dialog.c'; then $(CYGPATH_W) 'ico-dialog.c'; else $(CYGPATH_W) '$(srcdir)/ico-dialog.c'; fi`
+
+file_ico-ico-load.o: ico-load.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -MT file_ico-ico-load.o -MD -MP -MF $(DEPDIR)/file_ico-ico-load.Tpo -c -o file_ico-ico-load.o `test -f 'ico-load.c' || echo '$(srcdir)/'`ico-load.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/file_ico-ico-load.Tpo $(DEPDIR)/file_ico-ico-load.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='ico-load.c' object='file_ico-ico-load.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -c -o file_ico-ico-load.o `test -f 'ico-load.c' || echo '$(srcdir)/'`ico-load.c
+
+file_ico-ico-load.obj: ico-load.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -MT file_ico-ico-load.obj -MD -MP -MF $(DEPDIR)/file_ico-ico-load.Tpo -c -o file_ico-ico-load.obj `if test -f 'ico-load.c'; then $(CYGPATH_W) 'ico-load.c'; else $(CYGPATH_W) '$(srcdir)/ico-load.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/file_ico-ico-load.Tpo $(DEPDIR)/file_ico-ico-load.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='ico-load.c' object='file_ico-ico-load.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -c -o file_ico-ico-load.obj `if test -f 'ico-load.c'; then $(CYGPATH_W) 'ico-load.c'; else $(CYGPATH_W) '$(srcdir)/ico-load.c'; fi`
+
+file_ico-ico-save.o: ico-save.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -MT file_ico-ico-save.o -MD -MP -MF $(DEPDIR)/file_ico-ico-save.Tpo -c -o file_ico-ico-save.o `test -f 'ico-save.c' || echo '$(srcdir)/'`ico-save.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/file_ico-ico-save.Tpo $(DEPDIR)/file_ico-ico-save.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='ico-save.c' object='file_ico-ico-save.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -c -o file_ico-ico-save.o `test -f 'ico-save.c' || echo '$(srcdir)/'`ico-save.c
+
+file_ico-ico-save.obj: ico-save.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -MT file_ico-ico-save.obj -MD -MP -MF $(DEPDIR)/file_ico-ico-save.Tpo -c -o file_ico-ico-save.obj `if test -f 'ico-save.c'; then $(CYGPATH_W) 'ico-save.c'; else $(CYGPATH_W) '$(srcdir)/ico-save.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/file_ico-ico-save.Tpo $(DEPDIR)/file_ico-ico-save.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='ico-save.c' object='file_ico-ico-save.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(file_ico_CFLAGS) $(CFLAGS) -c -o file_ico-ico-save.obj `if test -f 'ico-save.c'; then $(CYGPATH_W) 'ico-save.c'; else $(CYGPATH_W) '$(srcdir)/ico-save.c'; fi`
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS)
+installdirs:
+	for dir in "$(DESTDIR)$(libexecdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libexecPROGRAMS clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/file_ico-ico-dialog.Po
+	-rm -f ./$(DEPDIR)/file_ico-ico-load.Po
+	-rm -f ./$(DEPDIR)/file_ico-ico-save.Po
+	-rm -f ./$(DEPDIR)/file_ico-ico.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info: info-am
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+install-exec-am: install-libexecPROGRAMS
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+install-html: install-html-am
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+install-html-am:
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+install-ps: install-ps-am
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+install-ps-am:
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+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/file_ico-ico-dialog.Po
+	-rm -f ./$(DEPDIR)/file_ico-ico-load.Po
+	-rm -f ./$(DEPDIR)/file_ico-ico-save.Po
+	-rm -f ./$(DEPDIR)/file_ico-ico.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
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+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
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+pdf-am:
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+ps: ps-am
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+ps-am:
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+uninstall-am: uninstall-libexecPROGRAMS
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libexecPROGRAMS clean-libtool \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-libexecPROGRAMS \
+	install-man install-pdf install-pdf-am install-ps \
+	install-ps-am install-strip installcheck installcheck-am \
+	installdirs maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-libexecPROGRAMS
+
+.PRECIOUS: Makefile
+
+
+# `windres` seems a very stupid tool and it breaks with double shlashes
+# in parameter paths. Strengthen the rule a little.
+@HAVE_WINDRES_TRUE@%.rc.o:
+@HAVE_WINDRES_TRUE@	$(WINDRES) --define ORIGINALFILENAME_STR="$*$(EXEEXT)" \
+@HAVE_WINDRES_TRUE@		--define INTERNALNAME_STR="$*" \
+@HAVE_WINDRES_TRUE@		--define TOP_SRCDIR="`echo $(top_srcdir) | sed 's*//*/*'`" \
+@HAVE_WINDRES_TRUE@		-I"`echo $(top_srcdir)/app | sed 's%/\+%/%'`" \
+@HAVE_WINDRES_TRUE@		-I"`echo $(top_builddir)/app | sed 's%/\+%/%'`"\
+@HAVE_WINDRES_TRUE@		-I"`echo $(top_builddir) | sed 's%/\+%/%'`"\
+@HAVE_WINDRES_TRUE@		$(GIMPPLUGINRC) $@
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/plug-ins/file-ico/ico-dialog.c b/plug-ins/file-ico/ico-dialog.c
new file mode 100644
index 0000000..84e9909
--- /dev/null
+++ b/plug-ins/file-ico/ico-dialog.c
@@ -0,0 +1,531 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+
+#include <config.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+/* #define ICO_DBG */
+
+#include "ico.h"
+#include "ico-dialog.h"
+#include "ico-save.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+static void   ico_dialog_bpp_changed     (GtkWidget   *combo,
+                                          GObject     *hbox);
+static void   ico_dialog_toggle_compress (GtkWidget   *checkbox,
+                                          GObject     *hbox);
+static void   ico_dialog_check_compat    (GtkWidget   *dialog,
+                                          IcoSaveInfo *info);
+
+
+GtkWidget *
+ico_dialog_new (IcoSaveInfo *info)
+{
+  GtkWidget *dialog;
+  GtkWidget *main_vbox;
+  GtkWidget *vbox;
+  GtkWidget *frame;
+  GtkWidget *scrolled_window;
+  GtkWidget *viewport;
+  GtkWidget *warning;
+
+  dialog = gimp_export_dialog_new (_("Windows Icon"),
+                                   PLUG_IN_BINARY,
+                                   "plug-in-winicon");
+
+  /* We store an array that holds each icon's requested bit depth
+     with the dialog. It's queried when the dialog is closed so the
+     save routine knows what colormaps etc to generate in the saved
+     file. We store twice the number necessary because in the second
+     set, the color depths that are automatically suggested are stored
+     for later comparison.
+  */
+
+  g_object_set_data (G_OBJECT (dialog), "save_info", info);
+
+  main_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (main_vbox), 12);
+  gtk_box_pack_start (GTK_BOX (gimp_export_dialog_get_content_area (dialog)),
+                      main_vbox, TRUE, TRUE, 0);
+  gtk_widget_show (main_vbox);
+
+  frame = gimp_frame_new (_("Icon Details"));
+  gtk_box_pack_start (GTK_BOX (main_vbox), frame, TRUE, TRUE, 0);
+  gtk_widget_show (frame);
+
+  scrolled_window = gtk_scrolled_window_new (NULL, NULL);
+  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_window),
+                                  GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
+  gtk_container_add (GTK_CONTAINER (frame), scrolled_window);
+  gtk_widget_show (scrolled_window);
+
+  viewport = gtk_viewport_new (NULL, NULL);
+  gtk_container_add (GTK_CONTAINER (scrolled_window), viewport);
+  gtk_widget_show (viewport);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 6);
+  g_object_set_data (G_OBJECT (dialog), "icons_vbox", vbox);
+  gtk_container_add (GTK_CONTAINER (viewport), vbox);
+  gtk_widget_show (vbox);
+
+  warning = g_object_new (GIMP_TYPE_HINT_BOX,
+                          "icon-name", GIMP_ICON_DIALOG_WARNING,
+                          "hint",
+                          _("Large icons and compression are not supported "
+                            "by all programs. Older applications may not "
+                            "open this file correctly."),
+                          NULL);
+  gtk_box_pack_end (GTK_BOX (main_vbox), warning, FALSE, FALSE, 0);
+  /* don't show the warning here */
+
+  g_object_set_data (G_OBJECT (dialog), "warning", warning);
+
+  return dialog;
+}
+
+static GtkWidget *
+ico_preview_new (gint32 layer)
+{
+  GtkWidget *image;
+  GdkPixbuf *pixbuf;
+  gint       width  = gimp_drawable_width (layer);
+  gint       height = gimp_drawable_height (layer);
+
+  pixbuf = gimp_drawable_get_thumbnail (layer,
+                                        MIN (width, 128), MIN (height, 128),
+                                        GIMP_PIXBUF_SMALL_CHECKS);
+  image = gtk_image_new_from_pixbuf (pixbuf);
+  g_object_unref (pixbuf);
+
+  return image;
+}
+
+/* This function creates and returns an hbox for an icon,
+   which then gets added to the dialog's main vbox. */
+static GtkWidget *
+ico_create_icon_hbox (GtkWidget   *icon_preview,
+                      gint32       layer,
+                      gint         layer_num,
+                      IcoSaveInfo *info)
+{
+  static GtkSizeGroup *size = NULL;
+
+  GtkWidget *hbox;
+  GtkWidget *vbox;
+  GtkWidget *alignment;
+  GtkWidget *combo;
+  GtkWidget *checkbox;
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+
+  alignment = gtk_alignment_new (1.0, 0.5, 0, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), alignment, FALSE, FALSE, 0);
+  gtk_widget_show (alignment);
+
+  /* To make life easier for the callbacks, we store the
+     layer's ID and stacking number with the hbox. */
+
+  g_object_set_data (G_OBJECT (hbox),
+                     "icon_layer", GINT_TO_POINTER (layer));
+  g_object_set_data (G_OBJECT (hbox),
+                     "icon_layer_num", GINT_TO_POINTER (layer_num));
+
+  g_object_set_data (G_OBJECT (hbox), "icon_preview", icon_preview);
+  gtk_container_add (GTK_CONTAINER (alignment), icon_preview);
+  gtk_widget_show (icon_preview);
+
+  if (! size)
+    size = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
+
+  gtk_size_group_add_widget (size, alignment);
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 2);
+  gtk_box_pack_start (GTK_BOX (hbox), vbox, FALSE, FALSE, 0);
+  gtk_widget_show (vbox);
+
+  combo = gimp_int_combo_box_new (_("1 bpp, 1-bit alpha, 2-slot palette"),   1,
+                                  _("4 bpp, 1-bit alpha, 16-slot palette"),  4,
+                                  _("8 bpp, 1-bit alpha, 256-slot palette"), 8,
+                                  _("24 bpp, 1-bit alpha, no palette"),     24,
+                                  _("32 bpp, 8-bit alpha, no palette"),     32,
+                                  NULL);
+  gimp_int_combo_box_set_active (GIMP_INT_COMBO_BOX (combo),
+                                 info->depths[layer_num]);
+
+  g_signal_connect (combo, "changed",
+                    G_CALLBACK (ico_dialog_bpp_changed),
+                    hbox);
+
+  g_object_set_data (G_OBJECT (hbox), "icon_menu", combo);
+
+  gtk_box_pack_start (GTK_BOX (vbox), combo, FALSE, FALSE, 0);
+  gtk_widget_show (combo);
+
+  checkbox = gtk_check_button_new_with_label (_("Compressed (PNG)"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (checkbox),
+                                info->compress[layer_num]);
+  g_signal_connect (checkbox, "toggled",
+                    G_CALLBACK (ico_dialog_toggle_compress), hbox);
+  gtk_box_pack_start (GTK_BOX (vbox), checkbox, FALSE, FALSE, 0);
+  gtk_widget_show (checkbox);
+
+  return hbox;
+}
+
+static GtkWidget *
+ico_dialog_get_layer_preview (GtkWidget *dialog,
+                              gint32     layer)
+{
+  GtkWidget *preview;
+  GtkWidget *icon_hbox;
+  gchar      key[ICO_MAXBUF];
+
+  g_snprintf (key, sizeof (key), "layer_%i_hbox", layer);
+  icon_hbox = g_object_get_data (G_OBJECT (dialog), key);
+
+  if (!icon_hbox)
+    {
+      D(("Something's wrong -- couldn't look up hbox by layer ID\n"));
+      return NULL;
+    }
+
+  preview = g_object_get_data (G_OBJECT (icon_hbox), "icon_preview");
+
+  if (!icon_hbox)
+    {
+      D(("Something's wrong -- couldn't look up preview from hbox\n"));
+      return NULL;
+    }
+
+  return preview;
+}
+
+static void
+ico_dialog_update_icon_preview (GtkWidget *dialog,
+                                gint32     layer,
+                                gint       bpp)
+{
+  GtkWidget  *preview = ico_dialog_get_layer_preview (dialog, layer);
+  GdkPixbuf  *pixbuf;
+  const Babl *format;
+  gint        w       = gimp_drawable_width (layer);
+  gint        h       = gimp_drawable_height (layer);
+
+  if (! preview)
+    return;
+
+  switch (gimp_drawable_type (layer))
+    {
+    case GIMP_RGB_IMAGE:
+      format = babl_format ("R'G'B' u8");
+      break;
+
+    case GIMP_RGBA_IMAGE:
+      format = babl_format ("R'G'B'A u8");
+      break;
+
+    case GIMP_GRAY_IMAGE:
+      format = babl_format ("Y' u8");
+      break;
+
+    case GIMP_GRAYA_IMAGE:
+      format = babl_format ("Y'A u8");
+      break;
+
+    case GIMP_INDEXED_IMAGE:
+    case GIMP_INDEXEDA_IMAGE:
+      format = gimp_drawable_get_format (layer);
+      break;
+
+    default:
+      g_return_if_reached ();
+    }
+
+  if (bpp <= 8)
+    {
+      GeglBuffer *buffer;
+      GeglBuffer *tmp;
+      gint32      image;
+      gint32      tmp_image;
+      gint32      tmp_layer;
+      guchar     *buf;
+      guchar     *cmap;
+      gint        num_colors;
+
+      image = gimp_item_get_image (layer);
+
+      tmp_image = gimp_image_new (w, h, gimp_image_base_type (image));
+      gimp_image_undo_disable (tmp_image);
+
+      if (gimp_drawable_is_indexed (layer))
+        {
+          cmap = gimp_image_get_colormap (image, &num_colors);
+          gimp_image_set_colormap (tmp_image, cmap, num_colors);
+          g_free (cmap);
+        }
+
+      tmp_layer = gimp_layer_new (tmp_image, "temporary", w, h,
+                                  gimp_drawable_type (layer),
+                                  100,
+                                  gimp_image_get_default_new_layer_mode (tmp_image));
+      gimp_image_insert_layer (tmp_image, tmp_layer, -1, 0);
+
+      buffer = gimp_drawable_get_buffer (layer);
+      tmp    = gimp_drawable_get_buffer (tmp_layer);
+
+      buf = g_malloc (w * h * 4);
+
+      gegl_buffer_get (buffer, GEGL_RECTANGLE (0, 0, w, h), 1.0,
+                       format, buf,
+                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+      gegl_buffer_copy (buffer, NULL, GEGL_ABYSS_NONE, tmp, NULL);
+
+      g_object_unref (tmp);
+      g_object_unref (buffer);
+
+      if (gimp_drawable_is_indexed (layer))
+        gimp_image_convert_rgb (tmp_image);
+
+      gimp_image_convert_indexed (tmp_image,
+                                  GIMP_CONVERT_DITHER_FS,
+                                  GIMP_CONVERT_PALETTE_GENERATE,
+                                  1 << bpp, TRUE, FALSE, "dummy");
+
+      cmap = gimp_image_get_colormap (tmp_image, &num_colors);
+
+      if (num_colors == (1 << bpp) &&
+          ! ico_cmap_contains_black (cmap, num_colors))
+        {
+          /* Windows icons with color maps need the color black.
+           * We need to eliminate one more color to make room for black.
+           */
+          if (gimp_drawable_is_indexed (layer))
+            {
+              g_free (cmap);
+              cmap = gimp_image_get_colormap (image, &num_colors);
+              gimp_image_set_colormap (tmp_image, cmap, num_colors);
+            }
+          else if (gimp_drawable_is_gray (layer))
+            {
+              gimp_image_convert_grayscale (tmp_image);
+            }
+          else
+            {
+              gimp_image_convert_rgb (tmp_image);
+            }
+
+          tmp = gimp_drawable_get_buffer (tmp_layer);
+
+          gegl_buffer_set (tmp, GEGL_RECTANGLE (0, 0, w, h), 0,
+                           format, buf, GEGL_AUTO_ROWSTRIDE);
+
+          g_object_unref (tmp);
+
+          if (!gimp_drawable_is_rgb (layer))
+            gimp_image_convert_rgb (tmp_image);
+
+          gimp_image_convert_indexed (tmp_image,
+                                      GIMP_CONVERT_DITHER_FS,
+                                      GIMP_CONVERT_PALETTE_GENERATE,
+                                      (1 << bpp) - 1, TRUE, FALSE, "dummy");
+        }
+
+      g_free (cmap);
+      g_free (buf);
+
+      pixbuf = gimp_drawable_get_thumbnail (tmp_layer,
+                                            MIN (w, 128), MIN (h, 128),
+                                            GIMP_PIXBUF_SMALL_CHECKS);
+
+      gimp_image_delete (tmp_image);
+    }
+  else if (bpp == 24)
+    {
+      GeglBuffer *buffer;
+      GeglBuffer *tmp;
+      gint32      image;
+      gint32      tmp_image;
+      gint32      tmp_layer;
+      GimpParam  *return_vals;
+      gint        n_return_vals;
+
+      image = gimp_item_get_image (layer);
+
+      tmp_image = gimp_image_new (w, h, gimp_image_base_type (image));
+      gimp_image_undo_disable (tmp_image);
+
+      if (gimp_drawable_is_indexed (layer))
+        {
+          guchar *cmap;
+          gint    num_colors;
+
+          cmap = gimp_image_get_colormap (image, &num_colors);
+          gimp_image_set_colormap (tmp_image, cmap, num_colors);
+          g_free (cmap);
+        }
+
+      tmp_layer = gimp_layer_new (tmp_image, "temporary", w, h,
+                                  gimp_drawable_type (layer),
+                                  100,
+                                  gimp_image_get_default_new_layer_mode (tmp_image));
+      gimp_image_insert_layer (tmp_image, tmp_layer, -1, 0);
+
+      buffer = gimp_drawable_get_buffer (layer);
+      tmp    = gimp_drawable_get_buffer (tmp_layer);
+
+      gegl_buffer_copy (buffer, NULL, GEGL_ABYSS_NONE, tmp, NULL);
+
+      g_object_unref (tmp);
+      g_object_unref (buffer);
+
+      if (gimp_drawable_is_indexed (layer))
+        gimp_image_convert_rgb (tmp_image);
+
+      return_vals =
+        gimp_run_procedure ("plug-in-threshold-alpha", &n_return_vals,
+                            GIMP_PDB_INT32, GIMP_RUN_NONINTERACTIVE,
+                            GIMP_PDB_IMAGE, tmp_image,
+                            GIMP_PDB_DRAWABLE, tmp_layer,
+                            GIMP_PDB_INT32, ICO_ALPHA_THRESHOLD,
+                            GIMP_PDB_END);
+      gimp_destroy_params (return_vals, n_return_vals);
+
+      pixbuf = gimp_drawable_get_thumbnail (tmp_layer,
+                                            MIN (w, 128), MIN (h, 128),
+                                            GIMP_PIXBUF_SMALL_CHECKS);
+
+      gimp_image_delete (tmp_image);
+    }
+  else
+    {
+      pixbuf = gimp_drawable_get_thumbnail (layer,
+                                            MIN (w, 128), MIN (h, 128),
+                                            GIMP_PIXBUF_SMALL_CHECKS);
+    }
+
+  gtk_image_set_from_pixbuf (GTK_IMAGE (preview), pixbuf);
+  g_object_unref (pixbuf);
+}
+
+void
+ico_dialog_add_icon (GtkWidget *dialog,
+                     gint32     layer,
+                     gint       layer_num)
+{
+  GtkWidget   *vbox;
+  GtkWidget   *hbox;
+  GtkWidget   *preview;
+  gchar        key[ICO_MAXBUF];
+  IcoSaveInfo *info;
+
+  vbox = g_object_get_data (G_OBJECT (dialog), "icons_vbox");
+  info = g_object_get_data (G_OBJECT (dialog), "save_info");
+
+  preview = ico_preview_new (layer);
+  hbox = ico_create_icon_hbox (preview, layer, layer_num, info);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+  gtk_widget_show (hbox);
+
+  /* Let's make the hbox accessible through the layer ID */
+  g_snprintf (key, sizeof (key), "layer_%i_hbox", layer);
+  g_object_set_data (G_OBJECT (dialog), key, hbox);
+
+  ico_dialog_update_icon_preview (dialog, layer, info->depths[layer_num]);
+
+  ico_dialog_check_compat (dialog, info);
+}
+
+static void
+ico_dialog_bpp_changed (GtkWidget *combo,
+                        GObject   *hbox)
+{
+  GtkWidget   *dialog;
+  gint32       layer;
+  gint         layer_num;
+  gint         bpp;
+  IcoSaveInfo *info;
+
+  dialog = gtk_widget_get_toplevel (combo);
+
+  gimp_int_combo_box_get_active (GIMP_INT_COMBO_BOX (combo), &bpp);
+
+  info = g_object_get_data (G_OBJECT (dialog), "save_info");
+  g_assert (info);
+
+  layer     = GPOINTER_TO_INT (g_object_get_data (hbox, "icon_layer"));
+  layer_num = GPOINTER_TO_INT (g_object_get_data (hbox, "icon_layer_num"));
+
+  /* Update vector entry for later when we're actually saving,
+     and update the preview right away ... */
+  info->depths[layer_num] = bpp;
+  ico_dialog_update_icon_preview (dialog, layer, bpp);
+}
+
+static void
+ico_dialog_toggle_compress (GtkWidget *checkbox,
+                            GObject   *hbox)
+{
+  GtkWidget   *dialog;
+  gint         layer_num;
+  IcoSaveInfo *info;
+
+  dialog = gtk_widget_get_toplevel (checkbox);
+
+  info = g_object_get_data (G_OBJECT (dialog), "save_info");
+  g_assert (info);
+  layer_num = GPOINTER_TO_INT (g_object_get_data (hbox, "icon_layer_num"));
+
+  /* Update vector entry for later when we're actually saving */
+  info->compress[layer_num] =
+    gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (checkbox));
+
+  ico_dialog_check_compat (dialog, info);
+}
+
+static void
+ico_dialog_check_compat (GtkWidget   *dialog,
+                         IcoSaveInfo *info)
+{
+  GtkWidget *warning;
+  gboolean   warn = FALSE;
+  gint       i;
+
+  for (i = 0; i < info->num_icons; i++)
+    {
+      if (gimp_drawable_width (info->layers[i]) > 255  ||
+          gimp_drawable_height (info->layers[i]) > 255 ||
+          info->compress[i])
+        {
+          warn = TRUE;
+          break;
+        }
+    }
+
+  warning = g_object_get_data (G_OBJECT (dialog), "warning");
+
+  gtk_widget_set_visible (warning, warn);
+}
diff --git a/plug-ins/file-ico/ico-dialog.h b/plug-ins/file-ico/ico-dialog.h
new file mode 100644
index 0000000..19ddee4
--- /dev/null
+++ b/plug-ins/file-ico/ico-dialog.h
@@ -0,0 +1,30 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ICO_DIALOG_H__
+#define __ICO_DIALOG_H__
+
+
+GtkWidget * ico_dialog_new                 (IcoSaveInfo *info);
+void        ico_dialog_add_icon            (GtkWidget *dialog,
+                                            gint32     layer,
+                                            gint       layer_num);
+
+#endif /* __ICO_DIALOG_H__ */
diff --git a/plug-ins/file-ico/ico-load.c b/plug-ins/file-ico/ico-load.c
new file mode 100644
index 0000000..f44b805
--- /dev/null
+++ b/plug-ins/file-ico/ico-load.c
@@ -0,0 +1,813 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#include <string.h>
+
+#include <glib/gstdio.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include <png.h>
+
+/* #define ICO_DBG */
+
+#include "ico.h"
+#include "ico-load.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+
+#define A_VAL(p) ((guchar *)(p))[3]
+#define R_VAL(p) ((guchar *)(p))[2]
+#define G_VAL(p) ((guchar *)(p))[1]
+#define B_VAL(p) ((guchar *)(p))[0]
+
+#define A_VAL_GIMP(p) ((guchar *)(p))[3]
+#define R_VAL_GIMP(p) ((guchar *)(p))[0]
+#define G_VAL_GIMP(p) ((guchar *)(p))[1]
+#define B_VAL_GIMP(p) ((guchar *)(p))[2]
+
+
+static gint       ico_read_int8  (FILE        *fp,
+                                  guint8      *data,
+                                  gint         count);
+static gint       ico_read_int16 (FILE        *fp,
+                                  guint16     *data,
+                                  gint         count);
+static gint       ico_read_int32 (FILE        *fp,
+                                  guint32     *data,
+                                  gint         count);
+
+static gint
+ico_read_int32 (FILE    *fp,
+                guint32 *data,
+                gint     count)
+{
+  gint i, total;
+
+  total = count;
+  if (count > 0)
+    {
+      ico_read_int8 (fp, (guint8 *) data, count * 4);
+      for (i = 0; i < count; i++)
+        data[i] = GUINT32_FROM_LE (data[i]);
+    }
+
+  return total * 4;
+}
+
+
+static gint
+ico_read_int16 (FILE    *fp,
+                guint16 *data,
+                gint     count)
+{
+  gint i, total;
+
+  total = count;
+  if (count > 0)
+    {
+      ico_read_int8 (fp, (guint8 *) data, count * 2);
+      for (i = 0; i < count; i++)
+        data[i] = GUINT16_FROM_LE (data[i]);
+    }
+
+  return total * 2;
+}
+
+
+static gint
+ico_read_int8 (FILE   *fp,
+               guint8 *data,
+               gint    count)
+{
+  gint total;
+  gint bytes;
+
+  total = count;
+  while (count > 0)
+    {
+      bytes = fread ((gchar *) data, sizeof (gchar), count, fp);
+      if (bytes <= 0) /* something bad happened */
+        break;
+
+      count -= bytes;
+      data += bytes;
+    }
+
+  return total;
+}
+
+
+static guint32
+ico_read_init (FILE *fp)
+{
+  IcoFileHeader header;
+
+  /* read and check file header */
+  if (! ico_read_int16 (fp, &header.reserved, 1)      ||
+      ! ico_read_int16 (fp, &header.resource_type, 1) ||
+      ! ico_read_int16 (fp, &header.icon_count, 1)    ||
+      header.reserved != 0 ||
+      header.resource_type != 1)
+    {
+      return 0;
+    }
+
+  return header.icon_count;
+}
+
+
+static gboolean
+ico_read_size (FILE        *fp,
+               IcoLoadInfo *info)
+{
+  png_structp png_ptr;
+  png_infop   info_ptr;
+  png_uint_32 w, h;
+  gint32      bpp;
+  gint32      color_type;
+  guint32     magic;
+
+  if (fseek (fp, info->offset, SEEK_SET) < 0)
+    return FALSE;
+
+  ico_read_int32 (fp, &magic, 1);
+
+  if (magic == ICO_PNG_MAGIC)
+    {
+      png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL,
+                                        NULL);
+      if (! png_ptr)
+        return FALSE;
+
+      info_ptr = png_create_info_struct (png_ptr);
+      if (! info_ptr)
+        {
+          png_destroy_read_struct (&png_ptr, NULL, NULL);
+          return FALSE;
+        }
+
+      if (setjmp (png_jmpbuf (png_ptr)))
+        {
+          png_destroy_read_struct (&png_ptr, NULL, NULL);
+          return FALSE;
+        }
+      png_init_io (png_ptr, fp);
+      png_set_sig_bytes (png_ptr, 4);
+      png_read_info (png_ptr, info_ptr);
+      png_get_IHDR (png_ptr, info_ptr, &w, &h, &bpp, &color_type,
+                    NULL, NULL, NULL);
+      png_destroy_read_struct (&png_ptr, &info_ptr, NULL);
+      info->width = w;
+      info->height = h;
+      D(("ico_read_size: PNG: %ix%i\n", info->width, info->height));
+      return TRUE;
+    }
+  else if (magic == 40)
+    {
+      if (ico_read_int32 (fp, &info->width, 1) &&
+          ico_read_int32 (fp, &info->height, 1))
+        {
+          info->height /= 2;
+          D(("ico_read_size: ICO: %ix%i\n", info->width, info->height));
+          return TRUE;
+        }
+      else
+        {
+          info->width = 0;
+          info->height = 0;
+          return FALSE;
+        }
+    }
+  return FALSE;
+}
+
+static IcoLoadInfo*
+ico_read_info (FILE    *fp,
+               gint     icon_count,
+               GError **error)
+{
+  gint            i;
+  IcoFileEntry   *entries;
+  IcoLoadInfo    *info;
+
+  /* read icon entries */
+  entries = g_new (IcoFileEntry, icon_count);
+  if (fread (entries, sizeof (IcoFileEntry), icon_count, fp) <= 0)
+    {
+      g_set_error (error, G_FILE_ERROR, 0,
+                   _("Could not read '%lu' bytes"),
+                   sizeof (IcoFileEntry));
+      g_free (entries);
+      return NULL;
+    }
+
+  info = g_new (IcoLoadInfo, icon_count);
+  for (i = 0; i < icon_count; i++)
+    {
+      info[i].width  = entries[i].width;
+      info[i].height = entries[i].height;
+      info[i].bpp    = GUINT16_FROM_LE (entries[i].bpp);
+      info[i].size   = GUINT32_FROM_LE (entries[i].size);
+      info[i].offset = GUINT32_FROM_LE (entries[i].offset);
+
+      if (info[i].width == 0 || info[i].height == 0)
+        {
+          ico_read_size (fp, info + i);
+        }
+
+      D(("ico_read_info: %ix%i (%i bits, size: %i, offset: %i)\n",
+         info[i].width, info[i].height, info[i].bpp,
+         info[i].size, info[i].offset));
+
+      if (info[i].width == 0 || info[i].height == 0)
+        {
+          g_set_error (error, G_FILE_ERROR, 0,
+                       _("Icon #%d has zero width or height"), i);
+          g_free (info);
+          g_free (entries);
+          return NULL;
+        }
+    }
+
+  g_free (entries);
+
+  return info;
+}
+
+static gboolean
+ico_read_png (FILE    *fp,
+              guint32  header,
+              guchar  *buf,
+              gint     maxsize,
+              gint    *width,
+              gint    *height)
+{
+  png_structp   png_ptr;
+  png_infop     info;
+  png_uint_32   w;
+  png_uint_32   h;
+  gint32        bit_depth;
+  gint32        color_type;
+  guint32     **rows;
+  gint          i;
+
+  png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  if (! png_ptr)
+    return FALSE;
+  info = png_create_info_struct (png_ptr);
+  if (! info)
+    {
+      png_destroy_read_struct (&png_ptr, NULL, NULL);
+      return FALSE;
+    }
+
+  if (setjmp (png_jmpbuf (png_ptr)))
+    {
+      png_destroy_read_struct (&png_ptr, &info, NULL);
+      return FALSE;
+    }
+
+  png_init_io (png_ptr, fp);
+  png_set_sig_bytes (png_ptr, 4);
+  png_read_info (png_ptr, info);
+  png_get_IHDR (png_ptr, info, &w, &h, &bit_depth, &color_type,
+                NULL, NULL, NULL);
+  if (w*h*4 > maxsize)
+    {
+      png_destroy_read_struct (&png_ptr, &info, NULL);
+      return FALSE;
+    }
+  D(("ico_read_png: %ix%i, %i bits, %i type\n", (gint)w, (gint)h,
+     bit_depth, color_type));
+  switch (color_type)
+    {
+    case PNG_COLOR_TYPE_GRAY:
+      png_set_expand_gray_1_2_4_to_8 (png_ptr);
+      if (bit_depth == 16)
+        png_set_strip_16 (png_ptr);
+      png_set_gray_to_rgb (png_ptr);
+      png_set_add_alpha (png_ptr, 0xff, PNG_FILLER_AFTER);
+      break;
+    case PNG_COLOR_TYPE_GRAY_ALPHA:
+      png_set_expand_gray_1_2_4_to_8 (png_ptr);
+      if (bit_depth == 16)
+        png_set_strip_16 (png_ptr);
+      png_set_gray_to_rgb (png_ptr);
+      break;
+    case PNG_COLOR_TYPE_PALETTE:
+      png_set_palette_to_rgb (png_ptr);
+      if (png_get_valid (png_ptr, info, PNG_INFO_tRNS))
+        png_set_tRNS_to_alpha (png_ptr);
+      else
+        png_set_add_alpha (png_ptr, 0xff, PNG_FILLER_AFTER);
+      break;
+    case PNG_COLOR_TYPE_RGB:
+      if (bit_depth == 16)
+        png_set_strip_16 (png_ptr);
+      png_set_add_alpha (png_ptr, 0xff, PNG_FILLER_AFTER);
+      break;
+    case PNG_COLOR_TYPE_RGB_ALPHA:
+      if (bit_depth == 16)
+        png_set_strip_16 (png_ptr);
+      break;
+    }
+
+  *width = w;
+  *height = h;
+  rows = g_new (guint32*, h);
+  rows[0] = (guint32*) buf;
+  for (i = 1; i < h; i++)
+    rows[i] = rows[i-1] + w;
+  png_read_image (png_ptr, (png_bytepp) rows);
+  png_destroy_read_struct (&png_ptr, &info, NULL);
+  g_free (rows);
+  return TRUE;
+}
+
+gint
+ico_get_bit_from_data (const guint8 *data,
+                       gint          line_width,
+                       gint          bit)
+{
+  gint line;
+  gint width32;
+  gint offset;
+  gint result;
+
+  /* width per line in multiples of 32 bits */
+  width32 = (line_width % 32 == 0 ? line_width/32 : line_width/32 + 1);
+  line = bit / line_width;
+  offset = bit % line_width;
+
+  result = (data[line * width32 * 4 + offset/8] & (1 << (7 - (offset % 8))));
+
+  return (result ? 1 : 0);
+}
+
+
+gint
+ico_get_nibble_from_data (const guint8 *data,
+                          gint          line_width,
+                          gint          nibble)
+{
+  gint line;
+  gint width32;
+  gint offset;
+  gint result;
+
+  /* width per line in multiples of 32 bits */
+  width32 = (line_width % 8 == 0 ? line_width/8 : line_width/8 + 1);
+  line = nibble / line_width;
+  offset = nibble % line_width;
+
+  result =
+    (data[line * width32 * 4 + offset/2] & (0x0F << (4 * (1 - offset % 2))));
+
+  if (offset % 2 == 0)
+    result = result >> 4;
+
+  return result;
+}
+
+gint
+ico_get_byte_from_data (const guint8 *data,
+                        gint          line_width,
+                        gint          byte)
+{
+  gint line;
+  gint width32;
+  gint offset;
+
+  /* width per line in multiples of 32 bits */
+  width32 = (line_width % 4 == 0 ? line_width / 4 : line_width / 4 + 1);
+  line = byte / line_width;
+  offset = byte % line_width;
+
+  return data[line * width32 * 4 + offset];
+}
+
+static gboolean
+ico_read_icon (FILE    *fp,
+               guint32  header_size,
+               guchar  *buf,
+               gint     maxsize,
+               gint    *width,
+               gint    *height)
+{
+  IcoFileDataHeader   data;
+  gint                length;
+  gint                x, y, w, h;
+  guchar             *xor_map, *and_map;
+  guint32            *palette;
+  guint32            *dest_vec;
+  guchar             *row;
+  gint                rowstride;
+
+  palette = NULL;
+
+  data.header_size = header_size;
+  ico_read_int32 (fp, &data.width, 1);
+  ico_read_int32 (fp, &data.height, 1);
+  ico_read_int16 (fp, &data.planes, 1);
+  ico_read_int16 (fp, &data.bpp, 1);
+  ico_read_int32 (fp, &data.compression, 1);
+  ico_read_int32 (fp, &data.image_size, 1);
+  ico_read_int32 (fp, &data.x_res, 1);
+  ico_read_int32 (fp, &data.y_res, 1);
+  ico_read_int32 (fp, &data.used_clrs, 1);
+  ico_read_int32 (fp, &data.important_clrs, 1);
+
+  D(("  header size %i, "
+     "w %i, h %i, planes %i, size %i, bpp %i, used %i, imp %i.\n",
+     data.header_size, data.width, data.height,
+     data.planes, data.image_size, data.bpp,
+     data.used_clrs, data.important_clrs));
+
+  if (data.planes      != 1 ||
+      data.compression != 0)
+    {
+      D(("skipping image: invalid header\n"));
+      return FALSE;
+    }
+
+  if (data.bpp != 1  &&
+      data.bpp != 4  &&
+      data.bpp != 8  &&
+      data.bpp != 24 &&
+      data.bpp != 32)
+    {
+      D(("skipping image: invalid depth: %i\n", data.bpp));
+      return FALSE;
+    }
+
+  if (data.width * data.height * 2 > maxsize)
+    {
+      D(("skipping image: too large\n"));
+      return FALSE;
+    }
+
+  w = data.width;
+  h = data.height / 2;
+
+  if (data.bpp <= 8)
+    {
+      if (data.used_clrs == 0)
+        data.used_clrs = (1 << data.bpp);
+
+      D(("  allocating a %i-slot palette for %i bpp.\n",
+         data.used_clrs, data.bpp));
+
+      palette = g_new0 (guint32, data.used_clrs);
+      ico_read_int8 (fp, (guint8 *) palette, data.used_clrs * 4);
+    }
+
+  xor_map = ico_alloc_map (w, h, data.bpp, &length);
+  ico_read_int8 (fp, xor_map, length);
+  D(("  length of xor_map: %i\n", length));
+
+  /* Read in and_map. It's padded out to 32 bits per line: */
+  and_map = ico_alloc_map (w, h, 1, &length);
+  ico_read_int8 (fp, and_map, length);
+  D(("  length of and_map: %i\n", length));
+
+  dest_vec = (guint32 *) buf;
+  switch (data.bpp)
+    {
+    case 1:
+      for (y = 0; y < h; y++)
+        for (x = 0; x < w; x++)
+          {
+            guint32 color = palette[ico_get_bit_from_data (xor_map,
+                                                           w, y * w + x)];
+            guint32 *dest = dest_vec + (h - 1 - y) * w + x;
+
+            R_VAL_GIMP (dest) = R_VAL (&color);
+            G_VAL_GIMP (dest) = G_VAL (&color);
+            B_VAL_GIMP (dest) = B_VAL (&color);
+
+            if (ico_get_bit_from_data (and_map, w, y * w + x))
+              A_VAL_GIMP (dest) = 0;
+            else
+              A_VAL_GIMP (dest) = 255;
+          }
+      break;
+
+    case 4:
+      for (y = 0; y < h; y++)
+        for (x = 0; x < w; x++)
+          {
+            guint32 color = palette[ico_get_nibble_from_data (xor_map,
+                                                              w, y * w + x)];
+            guint32 *dest = dest_vec + (h - 1 - y) * w + x;
+
+            R_VAL_GIMP (dest) = R_VAL (&color);
+            G_VAL_GIMP (dest) = G_VAL (&color);
+            B_VAL_GIMP (dest) = B_VAL (&color);
+
+            if (ico_get_bit_from_data (and_map, w, y * w + x))
+              A_VAL_GIMP (dest) = 0;
+            else
+              A_VAL_GIMP (dest) = 255;
+          }
+      break;
+
+    case 8:
+      for (y = 0; y < h; y++)
+        for (x = 0; x < w; x++)
+          {
+            guint32 color = palette[ico_get_byte_from_data (xor_map,
+                                                            w, y * w + x)];
+            guint32 *dest = dest_vec + (h - 1 - y) * w + x;
+
+            R_VAL_GIMP (dest) = R_VAL (&color);
+            G_VAL_GIMP (dest) = G_VAL (&color);
+            B_VAL_GIMP (dest) = B_VAL (&color);
+
+            if (ico_get_bit_from_data (and_map, w, y * w + x))
+              A_VAL_GIMP (dest) = 0;
+            else
+              A_VAL_GIMP (dest) = 255;
+          }
+      break;
+
+    default:
+      {
+        gint bytespp = data.bpp / 8;
+
+        rowstride = ico_rowstride (w, data.bpp);
+
+        for (y = 0; y < h; y++)
+          {
+            row = xor_map + rowstride * y;
+
+            for (x = 0; x < w; x++)
+              {
+                guint32 *dest = dest_vec + (h - 1 - y) * w + x;
+
+                B_VAL_GIMP (dest) = row[0];
+                G_VAL_GIMP (dest) = row[1];
+                R_VAL_GIMP (dest) = row[2];
+
+                if (data.bpp < 32)
+                  {
+                    if (ico_get_bit_from_data (and_map, w, y * w + x))
+                      A_VAL_GIMP (dest) = 0;
+                    else
+                      A_VAL_GIMP (dest) = 255;
+                  }
+                else
+                  {
+                    A_VAL_GIMP (dest) = row[3];
+                  }
+
+                row += bytespp;
+              }
+          }
+      }
+    }
+  if (palette)
+    g_free (palette);
+  g_free (xor_map);
+  g_free (and_map);
+  *width = w;
+  *height = h;
+  return TRUE;
+}
+
+static gint32
+ico_load_layer (FILE        *fp,
+                gint32       image,
+                gint32       icon_num,
+                guchar      *buf,
+                gint         maxsize,
+                IcoLoadInfo *info)
+{
+  gint        width, height;
+  gint32      layer;
+  guint32     first_bytes;
+  GeglBuffer *buffer;
+  gchar       name[ICO_MAXBUF];
+
+  if (fseek (fp, info->offset, SEEK_SET) < 0 ||
+      ! ico_read_int32 (fp, &first_bytes, 1))
+    return -1;
+
+  if (first_bytes == ICO_PNG_MAGIC)
+    {
+      if (!ico_read_png (fp, first_bytes, buf, maxsize, &width, &height))
+        return -1;
+    }
+  else if (first_bytes == 40)
+    {
+      if (!ico_read_icon (fp, first_bytes, buf, maxsize, &width, &height))
+        return -1;
+    }
+  else
+    {
+      return -1;
+    }
+
+  /* read successfully. add to image */
+  g_snprintf (name, sizeof (name), _("Icon #%i"), icon_num+1);
+  layer = gimp_layer_new (image, name, width, height,
+                          GIMP_RGBA_IMAGE,
+                          100,
+                          gimp_image_get_default_new_layer_mode (image));
+  gimp_image_insert_layer (image, layer, -1, icon_num);
+
+  buffer = gimp_drawable_get_buffer (layer);
+
+  gegl_buffer_set (buffer, GEGL_RECTANGLE (0, 0, width, height), 0,
+                   NULL, buf, GEGL_AUTO_ROWSTRIDE);
+
+  g_object_unref (buffer);
+
+  return layer;
+}
+
+
+gint32
+ico_load_image (const gchar  *filename,
+                GError      **error)
+{
+  FILE        *fp;
+  IcoLoadInfo *info;
+  gint         max_width, max_height;
+  gint         i;
+  gint32       image;
+  guchar      *buf;
+  guint        icon_count;
+  gint         maxsize;
+
+  gimp_progress_init_printf (_("Opening '%s'"),
+                             gimp_filename_to_utf8 (filename));
+
+  fp = g_fopen (filename, "rb");
+  if (! fp)
+    {
+      g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                   _("Could not open '%s' for reading: %s"),
+                   gimp_filename_to_utf8 (filename), g_strerror (errno));
+      return -1;
+    }
+
+  icon_count = ico_read_init (fp);
+  if (!icon_count)
+    {
+      fclose (fp);
+      return -1;
+    }
+
+  info = ico_read_info (fp, icon_count, error);
+  if (! info)
+    {
+      fclose (fp);
+      return -1;
+    }
+
+  /* find width and height of image */
+  max_width = 0;
+  max_height = 0;
+  for (i = 0; i < icon_count; i++)
+    {
+      if (info[i].width > max_width)
+        max_width = info[i].width;
+      if (info[i].height > max_height)
+        max_height = info[i].height;
+    }
+  if (max_width <= 0 || max_height <= 0)
+    {
+      g_free (info);
+      fclose (fp);
+      return -1;
+    }
+  D(("image size: %ix%i\n", max_width, max_height));
+
+  image = gimp_image_new (max_width, max_height, GIMP_RGB);
+  gimp_image_set_filename (image, filename);
+
+  maxsize = max_width * max_height * 4;
+  buf = g_new (guchar, max_width * max_height * 4);
+  for (i = 0; i < icon_count; i++)
+    {
+      ico_load_layer (fp, image, i, buf, maxsize, info+i);
+    }
+  g_free (buf);
+  g_free (info);
+  fclose (fp);
+
+  gimp_progress_update (1.0);
+
+  return image;
+}
+
+gint32
+ico_load_thumbnail_image (const gchar  *filename,
+                          gint         *width,
+                          gint         *height,
+                          GError      **error)
+{
+  FILE        *fp;
+  IcoLoadInfo *info;
+  gint32       image;
+  gint         w     = 0;
+  gint         h     = 0;
+  gint         bpp   = 0;
+  gint         match = 0;
+  gint         i, icon_count;
+  guchar      *buf;
+
+  gimp_progress_init_printf (_("Opening thumbnail for '%s'"),
+                             gimp_filename_to_utf8 (filename));
+
+  fp = g_fopen (filename, "rb");
+  if (! fp)
+    {
+      g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                   _("Could not open '%s' for reading: %s"),
+                   gimp_filename_to_utf8 (filename), g_strerror (errno));
+      return -1;
+    }
+
+  icon_count = ico_read_init (fp);
+  if (! icon_count)
+    {
+      fclose (fp);
+      return -1;
+    }
+
+  D(("*** %s: Microsoft icon file, containing %i icon(s)\n",
+     filename, icon_count));
+
+  info = ico_read_info (fp, icon_count, error);
+  if (! info)
+    {
+      fclose (fp);
+      return -1;
+    }
+
+  /* Do a quick scan of the icons in the file to find the best match */
+  for (i = 0; i < icon_count; i++)
+    {
+      if ((info[i].width  > w && w < *width) ||
+          (info[i].height > h && h < *height))
+        {
+          w = info[i].width;
+          h = info[i].height;
+          bpp = info[i].bpp;
+
+          match = i;
+        }
+      else if (w == info[i].width  &&
+               h == info[i].height &&
+               info[i].bpp > bpp)
+        {
+          /* better quality */
+          bpp = info[i].bpp;
+          match = i;
+        }
+    }
+
+  if (w <= 0 || h <= 0)
+    return -1;
+
+  image = gimp_image_new (w, h, GIMP_RGB);
+  buf = g_new (guchar, w*h*4);
+  ico_load_layer (fp, image, match, buf, w*h*4, info+match);
+  g_free (buf);
+
+  *width  = w;
+  *height = h;
+
+  D(("*** thumbnail successfully loaded.\n\n"));
+
+  gimp_progress_update (1.0);
+
+  g_free (info);
+  fclose (fp);
+
+  return image;
+}
diff --git a/plug-ins/file-ico/ico-load.h b/plug-ins/file-ico/ico-load.h
new file mode 100644
index 0000000..8749fd9
--- /dev/null
+++ b/plug-ins/file-ico/ico-load.h
@@ -0,0 +1,43 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ICO_LOAD_H__
+#define __ICO_LOAD_H__
+
+
+gint32 ico_load_image           (const gchar   *filename,
+                                 GError       **error);
+gint32 ico_load_thumbnail_image (const gchar   *filename,
+                                 gint          *width,
+                                 gint          *height,
+                                 GError       **error);
+
+gint   ico_get_bit_from_data    (const guint8  *data,
+                                 gint           line_width,
+                                 gint           bit);
+gint   ico_get_nibble_from_data (const guint8  *data,
+                                 gint           line_width,
+                                 gint           nibble);
+gint   ico_get_byte_from_data   (const guint8  *data,
+                                 gint           line_width,
+                                 gint           byte);
+
+
+#endif /* __ICO_LOAD_H__ */
diff --git a/plug-ins/file-ico/ico-save.c b/plug-ins/file-ico/ico-save.c
new file mode 100644
index 0000000..f8ce431
--- /dev/null
+++ b/plug-ins/file-ico/ico-save.c
@@ -0,0 +1,1176 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <errno.h>
+#include <string.h>
+
+#include <glib/gstdio.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include <png.h>
+
+/* #define ICO_DBG */
+
+#include "ico.h"
+#include "ico-load.h"
+#include "ico-save.h"
+#include "ico-dialog.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+
+static gint     ico_write_int8         (FILE   *fp,
+                                        guint8 *data,
+                                        gint    count);
+static gint     ico_write_int16        (FILE *fp,
+                                        guint16 *data,
+                                        gint count);
+static gint     ico_write_int32        (FILE    *fp,
+                                        guint32 *data,
+                                        gint     count);
+
+/* Helpers to set bits in a *cleared* data chunk */
+static void     ico_set_bit_in_data    (guint8 *data,
+                                        gint    line_width,
+                                        gint    bit_num,
+                                        gint    bit_val);
+static void     ico_set_nibble_in_data (guint8 *data,
+                                        gint    line_width,
+                                        gint    nibble_num,
+                                        gint    nibble_val);
+static void     ico_set_byte_in_data   (guint8 *data,
+                                        gint    line_width,
+                                        gint    byte_num,
+                                        gint    byte_val);
+
+static gint     ico_get_layer_num_colors  (gint32    layer,
+                                           gboolean *uses_alpha_levels);
+static void     ico_image_get_reduced_buf (guint32   layer,
+                                           gint      bpp,
+                                           gint     *num_colors,
+                                           guchar  **cmap_out,
+                                           guchar  **buf_out);
+
+
+static gint
+ico_write_int32 (FILE     *fp,
+                 guint32  *data,
+                 gint      count)
+{
+  gint total;
+
+  total = count;
+  if (count > 0)
+    {
+#if (G_BYTE_ORDER == G_BIG_ENDIAN)
+      gint i;
+
+      for (i = 0; i < count; i++)
+        data[i] = GUINT32_FROM_LE (data[i]);
+#endif
+
+      ico_write_int8 (fp, (guint8 *) data, count * 4);
+
+#if (G_BYTE_ORDER == G_BIG_ENDIAN)
+      /* Put it back like we found it */
+      for (i = 0; i < count; i++)
+        data[i] = GUINT32_FROM_LE (data[i]);
+#endif
+    }
+
+  return total * 4;
+}
+
+
+static gint
+ico_write_int16 (FILE     *fp,
+                 guint16  *data,
+                 gint      count)
+{
+  gint total;
+
+  total = count;
+  if (count > 0)
+    {
+#if (G_BYTE_ORDER == G_BIG_ENDIAN)
+      gint i;
+
+      for (i = 0; i < count; i++)
+        data[i] = GUINT16_FROM_LE (data[i]);
+#endif
+
+      ico_write_int8 (fp, (guint8 *) data, count * 2);
+
+#if (G_BYTE_ORDER == G_BIG_ENDIAN)
+      /* Put it back like we found it */
+      for (i = 0; i < count; i++)
+        data[i] = GUINT16_FROM_LE (data[i]);
+#endif
+    }
+
+  return total * 2;
+}
+
+
+static gint
+ico_write_int8 (FILE     *fp,
+                guint8   *data,
+                gint      count)
+{
+  gint total;
+  gint bytes;
+
+  total = count;
+  while (count > 0)
+    {
+      bytes = fwrite ((gchar *) data, sizeof (gchar), count, fp);
+      if (bytes <= 0) /* something bad happened */
+        break;
+      count -= bytes;
+      data += bytes;
+    }
+
+  return total;
+}
+
+
+static void
+ico_save_init (gint32       image_ID,
+               IcoSaveInfo *info)
+{
+  gint      *layers;
+  gint       i, num_colors;
+  gboolean   uses_alpha_values = FALSE;
+
+  layers = gimp_image_get_layers (image_ID, &info->num_icons);
+  info->layers = layers;
+  info->depths = g_new (gint, info->num_icons);
+  info->default_depths = g_new (gint, info->num_icons);
+  info->compress = g_new (gboolean, info->num_icons);
+
+  /* Limit the color depths to values that don't cause any color loss --
+     the user should pick these anyway, so we can save her some time.
+     If the user wants to lose some colors, the settings can always be changed
+     in the dialog: */
+  for (i = 0; i < info->num_icons; i++)
+    {
+      num_colors = ico_get_layer_num_colors (layers[i], &uses_alpha_values);
+
+      if (!uses_alpha_values)
+        {
+          if (num_colors <= 2)
+            {
+              /* Let's suggest monochrome */
+              info->default_depths [i] = 1;
+            }
+          else if (num_colors <= 16)
+            {
+              /* Let's suggest 4bpp */
+              info->default_depths [i] = 4;
+            }
+          else if (num_colors <= 256)
+            {
+              /* Let's suggest 8bpp */
+              info->default_depths [i] = 8;
+            }
+          else
+            {
+              /* Let's suggest 24bpp */
+              info->default_depths [i] = 24;
+            }
+        }
+      else
+        {
+          /* Otherwise, or if real alpha levels are used, stick with 32bpp */
+          info->default_depths [i] = 32;
+        }
+
+      /* vista icons */
+      if (gimp_drawable_width (layers[i]) > 255
+          || gimp_drawable_height (layers[i]) > 255 )
+        {
+          info->compress[i] = TRUE;
+        }
+      else
+        {
+          info->compress[i] = FALSE;
+        }
+    }
+
+  /* set with default values */
+  memcpy (info->depths, info->default_depths,
+          sizeof (gint) * info->num_icons);
+}
+
+
+
+static gboolean
+ico_save_dialog (gint32          image_ID,
+                 IcoSaveInfo    *info)
+{
+  GtkWidget *dialog;
+  gint       i;
+  gint       response;
+
+  gimp_ui_init (PLUG_IN_BINARY, TRUE);
+
+  dialog = ico_dialog_new (info);
+  for (i = 0; i < info->num_icons; i++)
+    {
+      /* if (gimp_layer_get_visible(layers[i])) */
+      ico_dialog_add_icon (dialog, info->layers[i], i);
+    }
+
+  /* Scale the thing to approximately fit its content, but not too large ... */
+  gtk_window_set_default_size (GTK_WINDOW (dialog),
+                               -1,
+                               200 + (info->num_icons > 4 ?
+                                      500 : info->num_icons * 120));
+
+  gtk_widget_show (dialog);
+
+  response = gimp_dialog_run (GIMP_DIALOG (dialog));
+
+  gtk_widget_destroy (dialog);
+
+  return (response == GTK_RESPONSE_OK);
+}
+
+static void
+ico_set_bit_in_data (guint8 *data,
+                     gint    line_width,
+                     gint    bit_num,
+                     gint    bit_val)
+{
+  gint line;
+  gint width32;
+  gint offset;
+
+  /* width per line in multiples of 32 bits */
+  width32 = (line_width % 32 == 0 ? line_width/32 : line_width/32 + 1);
+
+  line = bit_num / line_width;
+  offset = bit_num % line_width;
+  bit_val = bit_val & 0x00000001;
+
+  data[line * width32 * 4 + offset/8] |= (bit_val << (7 - (offset % 8)));
+}
+
+
+static void
+ico_set_nibble_in_data (guint8 *data,
+                        gint    line_width,
+                        gint    nibble_num,
+                        gint    nibble_val)
+{
+  gint line;
+  gint width8;
+  gint offset;
+
+  /* width per line in multiples of 32 bits */
+  width8 = (line_width % 8 == 0 ? line_width/8 : line_width/8 + 1);
+
+  line = nibble_num / line_width;
+  offset = nibble_num % line_width;
+  nibble_val = nibble_val & 0x0000000F;
+
+  data[line * width8 * 4 + offset/2] |=
+    (nibble_val << (4 * (1 - (offset % 2))));
+}
+
+
+static void
+ico_set_byte_in_data (guint8 *data,
+                      gint    line_width,
+                      gint    byte_num,
+                      gint    byte_val)
+{
+  gint line;
+  gint width4;
+  gint offset;
+  gint byte;
+
+  /* width per line in multiples of 32 bits */
+  width4 = (line_width % 4 == 0 ? line_width/4 : line_width/4 + 1);
+
+  line = byte_num / line_width;
+  offset = byte_num % line_width;
+  byte = byte_val & 0x000000FF;
+
+  data[line * width4 * 4 + offset] = byte;
+}
+
+
+/* Create a colormap from the given buffer data */
+static guint32 *
+ico_create_palette (const guchar *cmap,
+                    gint          num_colors,
+                    gint          num_colors_used,
+                    gint         *black_slot)
+{
+  guchar *palette;
+  gint    i;
+
+  g_return_val_if_fail (cmap != NULL || num_colors_used == 0, NULL);
+  g_return_val_if_fail (num_colors_used <= num_colors, NULL);
+
+  palette = g_new0 (guchar, num_colors * 4);
+  *black_slot = -1;
+
+  for (i = 0; i < num_colors_used; i++)
+    {
+      palette[i * 4 + 2] = cmap[i * 3];
+      palette[i * 4 + 1] = cmap[i * 3 + 1];
+      palette[i * 4]     = cmap[i * 3 + 2];
+
+      if ((cmap[i*3]     == 0) &&
+          (cmap[i*3 + 1] == 0) &&
+          (cmap[i*3 + 2] == 0))
+        {
+          *black_slot = i;
+        }
+    }
+
+  if (*black_slot == -1)
+    {
+      if (num_colors_used == num_colors)
+        {
+          D(("WARNING -- no room for black, this shouldn't happen.\n"));
+          *black_slot = num_colors - 1;
+
+          palette[(num_colors-1) * 4]     = 0;
+          palette[(num_colors-1) * 4 + 1] = 0;
+          palette[(num_colors-1) * 4 + 2] = 0;
+        }
+      else
+        {
+          *black_slot = num_colors_used;
+        }
+    }
+
+  return (guint32 *) palette;
+}
+
+
+static GHashTable *
+ico_create_color_to_palette_map (const guint32 *palette,
+                                 gint           num_colors)
+{
+  GHashTable *hash;
+  gint        i;
+
+  hash = g_hash_table_new_full (g_int_hash, g_int_equal,
+                                (GDestroyNotify) g_free,
+                                (GDestroyNotify) g_free);
+
+  for (i = 0; i < num_colors; i++)
+    {
+      const guint8 *pixel = (const guint8 *) &palette[i];
+      gint         *color;
+      gint         *slot;
+
+      color = g_new (gint, 1);
+      slot = g_new (gint, 1);
+
+      *color = (pixel[2] << 16 | pixel[1] << 8 | pixel[0]);
+      *slot = i;
+
+      g_hash_table_insert (hash, color, slot);
+    }
+
+  return hash;
+}
+
+static gint
+ico_get_palette_index (GHashTable *hash,
+                       gint        red,
+                       gint        green,
+                       gint        blue)
+{
+  gint  color = 0;
+  gint *slot;
+
+  color = (red << 16 | green << 8 | blue);
+  slot = g_hash_table_lookup (hash, &color);
+
+  if (!slot)
+    {
+      return 0;
+    }
+
+  return *slot;
+}
+
+static gint
+ico_get_layer_num_colors (gint32    layer,
+                          gboolean *uses_alpha_levels)
+{
+  gint        w, h;
+  gint        bpp;
+  gint        num_colors = 0;
+  guint       num_pixels;
+  guchar     *buf;
+  guchar     *src;
+  guint32    *colors;
+  guint32    *c;
+  GHashTable *hash;
+  GeglBuffer *buffer = gimp_drawable_get_buffer (layer);
+  const Babl *format;
+
+  w = gegl_buffer_get_width  (buffer);
+  h = gegl_buffer_get_height (buffer);
+
+  num_pixels = w * h;
+
+  switch (gimp_drawable_type (layer))
+    {
+    case GIMP_RGB_IMAGE:
+      format = babl_format ("R'G'B' u8");
+      break;
+
+    case GIMP_RGBA_IMAGE:
+      format = babl_format ("R'G'B'A u8");
+      break;
+
+    case GIMP_GRAY_IMAGE:
+      format = babl_format ("Y' u8");
+      break;
+
+    case GIMP_GRAYA_IMAGE:
+      format = babl_format ("Y'A u8");
+      break;
+
+    case GIMP_INDEXED_IMAGE:
+    case GIMP_INDEXEDA_IMAGE:
+      format = gegl_buffer_get_format (buffer);
+      /* It is possible to count the colors of indexed image more easily
+       * with gimp_image_get_colormap(), but counting only the colors
+       * actually used will allow more efficient bpp if possible. */
+      break;
+
+    default:
+      g_return_val_if_reached (0);
+    }
+
+  bpp = babl_format_get_bytes_per_pixel (format);
+
+  buf = src = g_new (guchar, num_pixels * bpp);
+
+  gegl_buffer_get (buffer, GEGL_RECTANGLE (0, 0, w, h), 1.0,
+                   format, buf,
+                   GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+  g_object_unref (buffer);
+
+  hash = g_hash_table_new (g_int_hash, g_int_equal);
+  *uses_alpha_levels = FALSE;
+
+  colors = c = g_new (guint32, num_pixels);
+
+  switch (bpp)
+    {
+    case 1:
+      while (num_pixels--)
+        {
+          *c = *src;
+          g_hash_table_insert (hash, c, c);
+          src++;
+          c++;
+        }
+      break;
+
+    case 2:
+      while (num_pixels--)
+        {
+          *c = (src[1] << 8) | src[0];
+          if (src[1] != 0 && src[1] != 255)
+            *uses_alpha_levels = TRUE;
+          g_hash_table_insert (hash, c, c);
+          src += 2;
+          c++;
+        }
+      break;
+
+    case 3:
+      while (num_pixels--)
+        {
+          *c = (src[2] << 16) | (src[1] << 8) | src[0];
+          g_hash_table_insert (hash, c, c);
+          src += 3;
+          c++;
+        }
+      break;
+
+    case 4:
+      while (num_pixels--)
+        {
+          *c = (src[3] << 24) | (src[2] << 16) | (src[1] << 8) | src[0];
+          if (src[3] != 0 && src[3] != 255)
+            *uses_alpha_levels = TRUE;
+          g_hash_table_insert (hash, c, c);
+          src += 4;
+          c++;
+        }
+      break;
+    }
+
+  num_colors = g_hash_table_size (hash);
+
+  g_hash_table_destroy (hash);
+
+  g_free (colors);
+  g_free (buf);
+
+  return num_colors;
+}
+
+gboolean
+ico_cmap_contains_black (const guchar *cmap,
+                         gint          num_colors)
+{
+  gint i;
+
+  for (i = 0; i < num_colors; i++)
+    {
+      if ((cmap[3 * i    ] == 0) &&
+          (cmap[3 * i + 1] == 0) &&
+          (cmap[3 * i + 2] == 0))
+        {
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
+
+static void
+ico_image_get_reduced_buf (guint32   layer,
+                           gint      bpp,
+                           gint     *num_colors,
+                           guchar  **cmap_out,
+                           guchar  **buf_out)
+{
+  gint32      tmp_image;
+  gint32      tmp_layer;
+  gint        w, h;
+  guchar     *buf;
+  guchar     *cmap   = NULL;
+  GeglBuffer *buffer = gimp_drawable_get_buffer (layer);
+  const Babl *format;
+
+  w = gegl_buffer_get_width  (buffer);
+  h = gegl_buffer_get_height (buffer);
+
+  switch (gimp_drawable_type (layer))
+    {
+    case GIMP_RGB_IMAGE:
+      format = babl_format ("R'G'B' u8");
+      break;
+
+    case GIMP_RGBA_IMAGE:
+      format = babl_format ("R'G'B'A u8");
+      break;
+
+    case GIMP_GRAY_IMAGE:
+      format = babl_format ("Y' u8");
+      break;
+
+    case GIMP_GRAYA_IMAGE:
+      format = babl_format ("Y'A u8");
+      break;
+
+    case GIMP_INDEXED_IMAGE:
+    case GIMP_INDEXEDA_IMAGE:
+      format = gegl_buffer_get_format (buffer);
+      break;
+
+    default:
+      g_return_if_reached ();
+    }
+
+  *num_colors = 0;
+
+  buf = g_new (guchar, w * h * 4);
+
+  if (bpp <= 8 || bpp == 24 || babl_format_get_bytes_per_pixel (format) != 4)
+    {
+      gint32      image = gimp_item_get_image (layer);
+      GeglBuffer *tmp;
+
+      tmp_image = gimp_image_new (w, h, gimp_image_base_type (image));
+      gimp_image_undo_disable (tmp_image);
+
+      if (gimp_drawable_is_indexed (layer))
+        {
+          guchar *cmap;
+          gint    num_colors;
+
+          cmap = gimp_image_get_colormap (image, &num_colors);
+          gimp_image_set_colormap (tmp_image, cmap, num_colors);
+          g_free (cmap);
+        }
+
+      tmp_layer = gimp_layer_new (tmp_image, "tmp", w, h,
+                                  gimp_drawable_type (layer),
+                                  100,
+                                  gimp_image_get_default_new_layer_mode (tmp_image));
+      gimp_image_insert_layer (tmp_image, tmp_layer, -1, 0);
+
+      tmp = gimp_drawable_get_buffer (tmp_layer);
+
+      gegl_buffer_get (buffer, GEGL_RECTANGLE (0, 0, w, h), 1.0,
+                       format, buf,
+                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+      gegl_buffer_copy (buffer, NULL, GEGL_ABYSS_NONE, tmp, NULL);
+
+      g_object_unref (tmp);
+
+      if (! gimp_drawable_is_rgb (tmp_layer))
+        gimp_image_convert_rgb (tmp_image);
+
+      if (bpp <= 8)
+        {
+          gimp_image_convert_indexed (tmp_image,
+                                      GIMP_CONVERT_DITHER_FS,
+                                      GIMP_CONVERT_PALETTE_GENERATE,
+                                      1 << bpp, TRUE, FALSE, "dummy");
+
+          cmap = gimp_image_get_colormap (tmp_image, num_colors);
+
+          if (*num_colors == (1 << bpp) &&
+              ! ico_cmap_contains_black (cmap, *num_colors))
+            {
+              /* Windows icons with color maps need the color black.
+               * We need to eliminate one more color to make room for black.
+               */
+
+              if (gimp_drawable_is_indexed (layer))
+                {
+                  g_free (cmap);
+                  cmap = gimp_image_get_colormap (image, num_colors);
+                  gimp_image_set_colormap (tmp_image, cmap, *num_colors);
+                }
+              else if (gimp_drawable_is_gray (layer))
+                {
+                  gimp_image_convert_grayscale (tmp_image);
+                }
+              else
+                {
+                  gimp_image_convert_rgb (tmp_image);
+                }
+
+              tmp = gimp_drawable_get_buffer (tmp_layer);
+
+              gegl_buffer_set (tmp, GEGL_RECTANGLE (0, 0, w, h), 0,
+                               format, buf, GEGL_AUTO_ROWSTRIDE);
+
+              g_object_unref (tmp);
+
+              if (! gimp_drawable_is_rgb (layer))
+                gimp_image_convert_rgb (tmp_image);
+
+              gimp_image_convert_indexed (tmp_image,
+                                          GIMP_CONVERT_DITHER_FS,
+                                          GIMP_CONVERT_PALETTE_GENERATE,
+                                          (1<<bpp) - 1, TRUE, FALSE, "dummy");
+              g_free (cmap);
+              cmap = gimp_image_get_colormap (tmp_image, num_colors);
+            }
+
+          gimp_image_convert_rgb (tmp_image);
+        }
+      else if (bpp == 24)
+        {
+          GimpParam    *return_vals;
+          gint          n_return_vals;
+
+          return_vals =
+            gimp_run_procedure ("plug-in-threshold-alpha", &n_return_vals,
+                                GIMP_PDB_INT32, GIMP_RUN_NONINTERACTIVE,
+                                GIMP_PDB_IMAGE, tmp_image,
+                                GIMP_PDB_DRAWABLE, tmp_layer,
+                                GIMP_PDB_INT32, ICO_ALPHA_THRESHOLD,
+                                GIMP_PDB_END);
+          gimp_destroy_params (return_vals, n_return_vals);
+        }
+
+      gimp_layer_add_alpha (tmp_layer);
+
+      tmp = gimp_drawable_get_buffer (tmp_layer);
+
+      gegl_buffer_get (tmp, GEGL_RECTANGLE (0, 0, w, h), 1.0,
+                       NULL, buf,
+                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+
+      g_object_unref (tmp);
+
+      gimp_image_delete (tmp_image);
+    }
+  else
+    {
+      gegl_buffer_get (buffer, GEGL_RECTANGLE (0, 0, w, h), 1.0,
+                       format, buf,
+                       GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
+    }
+
+  g_object_unref (buffer);
+
+  *cmap_out = cmap;
+  *buf_out = buf;
+}
+
+static gboolean
+ico_write_png (FILE   *fp,
+               gint32  layer,
+               gint32  depth)
+{
+  png_structp png_ptr;
+  png_infop   info_ptr;
+  png_byte  **row_pointers;
+  gint        i, rowstride;
+  gint        width, height;
+  gint        num_colors_used;
+  guchar     *palette;
+  guchar     *buf;
+
+  row_pointers = NULL;
+  palette = NULL;
+  buf = NULL;
+
+  width = gimp_drawable_width (layer);
+  height = gimp_drawable_height (layer);
+
+  png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  if ( !png_ptr )
+    return FALSE;
+
+  info_ptr = png_create_info_struct (png_ptr);
+  if ( !info_ptr )
+    {
+      png_destroy_write_struct (&png_ptr, NULL);
+      return FALSE;
+    }
+
+  if (setjmp (png_jmpbuf (png_ptr)))
+    {
+      png_destroy_write_struct (&png_ptr, &info_ptr);
+      if ( row_pointers )
+        g_free (row_pointers);
+      if (palette)
+        g_free (palette);
+      if (buf)
+        g_free (buf);
+      return FALSE;
+    }
+
+  ico_image_get_reduced_buf (layer, depth, &num_colors_used,
+                             &palette, &buf);
+
+  png_init_io (png_ptr, fp);
+  png_set_IHDR (png_ptr, info_ptr, width, height,
+                8,
+                PNG_COLOR_TYPE_RGBA,
+                PNG_INTERLACE_NONE,
+                PNG_COMPRESSION_TYPE_DEFAULT,
+                PNG_FILTER_TYPE_DEFAULT);
+  png_write_info (png_ptr, info_ptr);
+
+  rowstride = ico_rowstride (width, 32);
+  row_pointers = g_new (png_byte*, height);
+  for (i = 0; i < height; i++)
+    {
+      row_pointers[i] = buf + rowstride * i;
+    }
+  png_write_image (png_ptr, row_pointers);
+
+  row_pointers = NULL;
+
+  png_write_end (png_ptr, info_ptr);
+  png_destroy_write_struct (&png_ptr, &info_ptr);
+
+  g_free (row_pointers);
+  g_free (palette);
+  g_free (buf);
+  return TRUE;
+}
+
+static gboolean
+ico_write_icon (FILE   *fp,
+                gint32  layer,
+                gint32  depth)
+{
+  IcoFileDataHeader  header;
+  gint               and_len, xor_len, palette_index, x, y;
+  gint               num_colors = 0, num_colors_used = 0, black_index = 0;
+  gint               width, height;
+  guchar            *buf = NULL, *pixel;
+  guint32           *buf32;
+  guchar            *palette;
+  GHashTable        *color_to_slot = NULL;
+  guchar            *xor_map, *and_map;
+
+  guint32           *palette32 = NULL;
+  gint               palette_len = 0;
+
+  guint8             alpha_threshold;
+
+  D(("Creating data structures for icon %i ------------------------\n",
+     num_icon));
+
+  width = gimp_drawable_width (layer);
+  height = gimp_drawable_height (layer);
+
+  header.header_size     = 40;
+  header.width          = width;
+  header.height         = 2 * height;
+  header.planes         = 1;
+  header.bpp            = depth;
+  header.compression    = 0;
+  header.image_size     = 0;
+  header.x_res          = 0;
+  header.y_res          = 0;
+  header.used_clrs      = 0;
+  header.important_clrs = 0;
+
+  num_colors = (1L << header.bpp);
+
+  D(("  header size %i, w %i, h %i, planes %i, bpp %i\n",
+     header.header_size, header.width, header.height, header.planes,
+     header.bpp));
+
+  /* Reduce colors in copy of image */
+  ico_image_get_reduced_buf (layer, header.bpp, &num_colors_used,
+                             &palette, &buf);
+  buf32 = (guint32 *) buf;
+
+  /* Set up colormap and and_map when necessary: */
+  if (header.bpp <= 8)
+    {
+      /* Create a colormap */
+      palette32 = ico_create_palette (palette,
+                                      num_colors, num_colors_used,
+                                      &black_index);
+      palette_len = num_colors * 4;
+
+      color_to_slot = ico_create_color_to_palette_map (palette32,
+                                                       num_colors_used);
+      D(("  created %i-slot colormap with %i colors, black at slot %i\n",
+         num_colors, num_colors_used, black_index));
+    }
+
+  /* Create and_map. It's padded out to 32 bits per line: */
+  and_map = ico_alloc_map (width, height, 1, &and_len);
+
+  /* 32-bit bitmaps have an alpha channel as well as a mask. Any partially or
+   * fully opaque pixel should have an opaque mask (some ICO code in Windows
+   * draws pixels as black if they have a transparent mask but a non-transparent
+   * alpha value).
+   *
+   * For bitmaps without an alpha channel, we use the normal threshold to build
+   * the mask, so that the mask is as close as possible to the original alpha
+   * channel.
+   */
+  alpha_threshold = header.bpp < 32 ? ICO_ALPHA_THRESHOLD : 0;
+
+  for (y = 0; y < height; y++)
+    for (x = 0; x < width; x++)
+      {
+        pixel = (guint8 *) &buf32[y * width + x];
+
+        ico_set_bit_in_data (and_map, width,
+                             (height - y -1) * width + x,
+                             (pixel[3] > alpha_threshold ? 0 : 1));
+      }
+
+  xor_map = ico_alloc_map (width, height, header.bpp, &xor_len);
+
+  /* Now fill in the xor map */
+  switch (header.bpp)
+    {
+    case 1:
+      for (y = 0; y < height; y++)
+        for (x = 0; x < width; x++)
+          {
+            pixel = (guint8 *) &buf32[y * width + x];
+            palette_index = ico_get_palette_index (color_to_slot, pixel[0],
+                                                   pixel[1], pixel[2]);
+
+            if (ico_get_bit_from_data (and_map, width,
+                                       (height - y - 1) * width + x))
+              {
+                ico_set_bit_in_data (xor_map, width,
+                                     (height - y -1) * width + x,
+                                     black_index);
+              }
+            else
+              {
+                ico_set_bit_in_data (xor_map, width,
+                                     (height - y -1) * width + x,
+                                     palette_index);
+              }
+          }
+      break;
+
+    case 4:
+      for (y = 0; y < height; y++)
+        for (x = 0; x < width; x++)
+          {
+            pixel = (guint8 *) &buf32[y * width + x];
+            palette_index = ico_get_palette_index(color_to_slot, pixel[0],
+                                                  pixel[1], pixel[2]);
+
+            if (ico_get_bit_from_data (and_map, width,
+                                       (height - y - 1) * width + x))
+              {
+                ico_set_nibble_in_data (xor_map, width,
+                                        (height - y -1) * width + x,
+                                        black_index);
+              }
+            else
+              {
+                ico_set_nibble_in_data (xor_map, width,
+                                        (height - y - 1) * width + x,
+                                        palette_index);
+              }
+          }
+      break;
+
+    case 8:
+      for (y = 0; y < height; y++)
+        for (x = 0; x < width; x++)
+          {
+            pixel = (guint8 *) &buf32[y * width + x];
+            palette_index = ico_get_palette_index (color_to_slot,
+                                                   pixel[0],
+                                                   pixel[1],
+                                                   pixel[2]);
+
+            if (ico_get_bit_from_data (and_map, width,
+                                       (height - y - 1) * width + x))
+              {
+                ico_set_byte_in_data (xor_map, width,
+                                      (height - y - 1) * width + x,
+                                      black_index);
+              }
+            else
+              {
+                ico_set_byte_in_data (xor_map, width,
+                                      (height - y - 1) * width + x,
+                                      palette_index);
+              }
+
+          }
+      break;
+
+    case 24:
+      for (y = 0; y < height; y++)
+        {
+          guchar *row = xor_map + (xor_len * (height - y - 1) / height);
+
+          for (x = 0; x < width; x++)
+            {
+              pixel = (guint8 *) &buf32[y * width + x];
+
+              row[0] = pixel[2];
+              row[1] = pixel[1];
+              row[2] = pixel[0];
+
+              row += 3;
+            }
+        }
+      break;
+
+    default:
+      for (y = 0; y < height; y++)
+        for (x = 0; x < width; x++)
+          {
+            pixel = (guint8 *) &buf32[y * width + x];
+
+            ((guint32 *) xor_map)[(height - y -1) * width + x] =
+              GUINT32_TO_LE ((pixel[0] << 16) |
+                             (pixel[1] << 8)  |
+                             (pixel[2])       |
+                             (pixel[3] << 24));
+          }
+    }
+
+  D(("  filled and_map of length %i, xor_map of length %i\n",
+     and_len, xor_len));
+
+  if (color_to_slot)
+    g_hash_table_destroy (color_to_slot);
+
+  g_free (palette);
+  g_free (buf);
+
+  ico_write_int32 (fp, (guint32*) &header, 3);
+  ico_write_int16 (fp, &header.planes, 2);
+  ico_write_int32 (fp, &header.compression, 6);
+
+  if (palette_len)
+    ico_write_int8 (fp, (guint8 *) palette32, palette_len);
+
+  ico_write_int8 (fp, xor_map, xor_len);
+  ico_write_int8 (fp, and_map, and_len);
+
+  g_free (palette32);
+  g_free (xor_map);
+  g_free (and_map);
+
+  return TRUE;
+}
+
+static void
+ico_save_info_free (IcoSaveInfo  *info)
+{
+  g_free (info->depths);
+  g_free (info->default_depths);
+  g_free (info->compress);
+  g_free (info->layers);
+  memset (info, 0, sizeof (IcoSaveInfo));
+}
+
+GimpPDBStatusType
+ico_save_image (const gchar  *filename,
+                gint32        image,
+                gint32        run_mode,
+                GError      **error)
+{
+  FILE *fp;
+
+  gint i;
+  gint width, height;
+  IcoSaveInfo      info;
+  IcoFileHeader    header;
+  IcoFileEntry    *entries;
+  gboolean          saved;
+
+  D(("*** Exporting Microsoft icon file %s\n", filename));
+
+  ico_save_init (image, &info);
+
+  if (run_mode == GIMP_RUN_INTERACTIVE)
+    {
+      /* Allow user to override default values */
+      if ( !ico_save_dialog (image, &info))
+        return GIMP_PDB_CANCEL;
+    }
+
+  gimp_progress_init_printf (_("Exporting '%s'"),
+                             gimp_filename_to_utf8 (filename));
+
+  if (! (fp = g_fopen (filename, "wb")))
+    {
+      g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (errno),
+                   _("Could not open '%s' for writing: %s"),
+                   gimp_filename_to_utf8 (filename), g_strerror (errno));
+      return GIMP_PDB_EXECUTION_ERROR;
+    }
+
+  header.reserved = 0;
+  header.resource_type = 1;
+  header.icon_count = info.num_icons;
+  if ( !ico_write_int16 (fp, &header.reserved, 1)
+       || !ico_write_int16 (fp, &header.resource_type, 1)
+       || !ico_write_int16 (fp, &header.icon_count, 1) )
+    {
+      ico_save_info_free (&info);
+      fclose (fp);
+      return GIMP_PDB_EXECUTION_ERROR;
+    }
+
+  entries = g_new0 (IcoFileEntry, info.num_icons);
+  if (fwrite (entries, sizeof (IcoFileEntry), info.num_icons, fp) <= 0)
+    {
+      ico_save_info_free (&info);
+      g_free (entries);
+      fclose (fp);
+      return GIMP_PDB_EXECUTION_ERROR;
+    }
+
+  for (i = 0; i < info.num_icons; i++)
+    {
+      gimp_progress_update ((gdouble)i / (gdouble)info.num_icons);
+
+      width = gimp_drawable_width (info.layers[i]);
+      height = gimp_drawable_height (info.layers[i]);
+      if (width <= 255 && height <= 255)
+        {
+          entries[i].width = width;
+          entries[i].height = height;
+        }
+      else
+        {
+          entries[i].width = 0;
+          entries[i].height = 0;
+        }
+      if ( info.depths[i] <= 8 )
+        entries[i].num_colors = 1 << info.depths[i];
+      else
+        entries[i].num_colors = 0;
+      entries[i].reserved = 0;
+      entries[i].planes = 1;
+      entries[i].bpp = info.depths[i];
+      entries[i].offset = ftell (fp);
+
+      if (info.compress[i])
+        saved = ico_write_png (fp, info.layers[i], info.depths[i]);
+      else
+        saved = ico_write_icon (fp, info.layers[i], info.depths[i]);
+
+      if (!saved)
+        {
+          ico_save_info_free (&info);
+          fclose (fp);
+          return GIMP_PDB_EXECUTION_ERROR;
+        }
+
+      entries[i].size = ftell (fp) - entries[i].offset;
+    }
+
+  for (i = 0; i < info.num_icons; i++)
+    {
+      entries[i].planes = GUINT16_TO_LE (entries[i].planes);
+      entries[i].bpp    = GUINT16_TO_LE (entries[i].bpp);
+      entries[i].size   = GUINT32_TO_LE (entries[i].size);
+      entries[i].offset = GUINT32_TO_LE (entries[i].offset);
+    }
+
+  if (fseek (fp, sizeof(IcoFileHeader), SEEK_SET) < 0
+      || fwrite (entries, sizeof (IcoFileEntry), info.num_icons, fp) <= 0)
+    {
+      ico_save_info_free (&info);
+      fclose (fp);
+      return GIMP_PDB_EXECUTION_ERROR;
+    }
+
+  gimp_progress_update (1.0);
+
+  ico_save_info_free (&info);
+  fclose (fp);
+  g_free (entries);
+
+  return GIMP_PDB_SUCCESS;
+}
diff --git a/plug-ins/file-ico/ico-save.h b/plug-ins/file-ico/ico-save.h
new file mode 100644
index 0000000..46d6ff5
--- /dev/null
+++ b/plug-ins/file-ico/ico-save.h
@@ -0,0 +1,34 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ICO_SAVE_H__
+#define __ICO_SAVE_H__
+
+
+GimpPDBStatusType ico_save_image          (const gchar   *file_name,
+                                           gint32         image_ID,
+                                           gint32         run_mode,
+                                           GError       **error);
+
+gboolean          ico_cmap_contains_black (const guchar  *cmap,
+                                           gint           num_colors);
+
+
+#endif /* __ICO_SAVE_H__ */
diff --git a/plug-ins/file-ico/ico.c b/plug-ins/file-ico/ico.c
new file mode 100644
index 0000000..6c15c22
--- /dev/null
+++ b/plug-ins/file-ico/ico.c
@@ -0,0 +1,345 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+/* #define ICO_DBG */
+
+#include "ico.h"
+#include "ico-load.h"
+#include "ico-save.h"
+
+#include "libgimp/stdplugins-intl.h"
+
+#define LOAD_PROC        "file-ico-load"
+#define LOAD_THUMB_PROC  "file-ico-load-thumb"
+#define SAVE_PROC        "file-ico-save"
+
+
+static void   query (void);
+static void   run   (const gchar      *name,
+                     gint              nparams,
+                     const GimpParam  *param,
+                     gint             *nreturn_vals,
+                     GimpParam       **return_vals);
+
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+  NULL,  /* init_proc  */
+  NULL,  /* quit_proc  */
+  query, /* query_proc */
+  run,   /* run_proc   */
+};
+
+
+MAIN ()
+
+
+static void
+query (void)
+{
+  static const GimpParamDef load_args[] =
+  {
+    { GIMP_PDB_INT32,    "run-mode",     "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_STRING,   "filename",     "The name of the file to load" },
+    { GIMP_PDB_STRING,   "raw-filename", "The name entered"             }
+  };
+  static const GimpParamDef load_return_vals[] =
+  {
+    { GIMP_PDB_IMAGE, "image", "Output image" },
+  };
+
+  static const GimpParamDef thumb_args[] =
+  {
+    { GIMP_PDB_STRING, "filename",     "The name of the file to load"  },
+    { GIMP_PDB_INT32,  "thumb-size",   "Preferred thumbnail size"      }
+  };
+  static const GimpParamDef thumb_return_vals[] =
+  {
+    { GIMP_PDB_IMAGE,  "image",        "Thumbnail image"               },
+    { GIMP_PDB_INT32,  "image-width",  "Width of full-sized image"     },
+    { GIMP_PDB_INT32,  "image-height", "Height of full-sized image"    }
+  };
+
+  static const GimpParamDef save_args[] =
+  {
+    { GIMP_PDB_INT32,    "run-mode",     "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }" },
+    { GIMP_PDB_IMAGE,    "image",        "Input image" },
+    { GIMP_PDB_DRAWABLE, "drawable",     "Drawable to save" },
+    { GIMP_PDB_STRING,   "filename",     "The name of the file to save the image in" },
+    { GIMP_PDB_STRING,   "raw-filename", "The name entered" },
+  };
+
+  gimp_install_procedure (LOAD_PROC,
+                          "Loads files of Windows ICO file format",
+                          "Loads files of Windows ICO file format",
+                          "Christian Kreibich <christian@whoop.org>",
+                          "Christian Kreibich <christian@whoop.org>",
+                          "2002",
+                          N_("Microsoft Windows icon"),
+                          NULL,
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (load_args),
+                          G_N_ELEMENTS (load_return_vals),
+                          load_args, load_return_vals);
+
+  gimp_register_file_handler_mime (LOAD_PROC, "image/x-ico");
+  /* We do not set magics here, since that interferes with certain types
+     of TGA images. */
+  gimp_register_load_handler (LOAD_PROC,
+                              "ico",
+                              "");
+
+  gimp_install_procedure (LOAD_THUMB_PROC,
+                          "Loads a preview from an Windows ICO file",
+                          "",
+                          "Dom Lachowicz, Sven Neumann",
+                          "Sven Neumann <sven@gimp.org>",
+                          "2005",
+                          NULL,
+                          NULL,
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (thumb_args),
+                          G_N_ELEMENTS (thumb_return_vals),
+                          thumb_args, thumb_return_vals);
+
+  gimp_register_thumbnail_loader (LOAD_PROC, LOAD_THUMB_PROC);
+
+  gimp_install_procedure (SAVE_PROC,
+                          "Saves files in Windows ICO file format",
+                          "Saves files in Windows ICO file format",
+                          "Christian Kreibich <christian@whoop.org>",
+                          "Christian Kreibich <christian@whoop.org>",
+                          "2002",
+                          N_("Microsoft Windows icon"),
+                          "*",
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (save_args), 0,
+                          save_args, NULL);
+
+  gimp_register_file_handler_mime (SAVE_PROC, "image/x-ico");
+  gimp_register_save_handler (SAVE_PROC, "ico", "");
+}
+
+static void
+run (const gchar      *name,
+     gint              nparams,
+     const GimpParam  *param,
+     gint             *nreturn_vals,
+     GimpParam       **return_vals)
+{
+  static GimpParam   values[4];
+  GimpRunMode        run_mode;
+  GimpPDBStatusType  status = GIMP_PDB_SUCCESS;
+  GimpExportReturn   export = GIMP_EXPORT_CANCEL;
+  GError            *error  = NULL;
+
+  INIT_I18N ();
+  gegl_init (NULL, NULL);
+
+  run_mode = param[0].data.d_int32;
+
+  *nreturn_vals = 1;
+  *return_vals  = values;
+
+  values[0].type          = GIMP_PDB_STATUS;
+  values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
+
+  if (strcmp (name, LOAD_PROC) == 0)
+    {
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+          break;
+
+        case GIMP_RUN_NONINTERACTIVE:
+          if (nparams != 3)
+            status = GIMP_PDB_CALLING_ERROR;
+          break;
+
+        default:
+          break;
+        }
+
+      if (status == GIMP_PDB_SUCCESS)
+        {
+          gint32 image_ID;
+
+          image_ID = ico_load_image (param[1].data.d_string, &error);
+          if (image_ID != -1)
+            {
+              *nreturn_vals = 2;
+              values[1].type         = GIMP_PDB_IMAGE;
+              values[1].data.d_image = image_ID;
+            }
+          else
+            {
+              status = GIMP_PDB_EXECUTION_ERROR;
+            }
+        }
+    }
+  else if (strcmp (name, LOAD_THUMB_PROC) == 0)
+    {
+      if (nparams < 2)
+        {
+          status = GIMP_PDB_CALLING_ERROR;
+        }
+      else
+        {
+          const gchar *filename = param[0].data.d_string;
+          gint         width    = param[1].data.d_int32;
+          gint         height   = param[1].data.d_int32;
+          gint32       image_ID;
+
+          image_ID = ico_load_thumbnail_image (filename,
+                                               &width, &height, &error);
+
+          if (image_ID != -1)
+            {
+              *nreturn_vals = 4;
+
+              values[1].type         = GIMP_PDB_IMAGE;
+              values[1].data.d_image = image_ID;
+              values[2].type         = GIMP_PDB_INT32;
+              values[2].data.d_int32 = width;
+              values[3].type         = GIMP_PDB_INT32;
+              values[3].data.d_int32 = height;
+            }
+          else
+            {
+              status = GIMP_PDB_EXECUTION_ERROR;
+            }
+        }
+    }
+  else if (strcmp (name, SAVE_PROC) == 0)
+    {
+      gchar *file_name;
+      gint32 image_ID;
+
+      image_ID    = param[1].data.d_int32;
+      file_name   = param[3].data.d_string;
+
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+          break;
+
+        case GIMP_RUN_NONINTERACTIVE:
+          /*  Make sure all the arguments are there!  */
+          if (nparams < 5)
+            status = GIMP_PDB_CALLING_ERROR;
+          break;
+
+        case GIMP_RUN_WITH_LAST_VALS:
+          break;
+
+        default:
+          break;
+        }
+
+      if (status == GIMP_PDB_SUCCESS)
+        {
+          status = ico_save_image (file_name, image_ID, run_mode, &error);
+        }
+
+      if (export == GIMP_EXPORT_EXPORT)
+        gimp_image_delete (image_ID);
+    }
+  else
+    {
+      status = GIMP_PDB_CALLING_ERROR;
+    }
+
+  if (status != GIMP_PDB_SUCCESS && error)
+    {
+      *nreturn_vals = 2;
+      values[1].type          = GIMP_PDB_STRING;
+      values[1].data.d_string = error->message;
+    }
+
+  values[0].data.d_status = status;
+}
+
+
+gint
+ico_rowstride (gint width,
+               gint bpp)
+{
+  switch (bpp)
+    {
+    case 1:
+      if ((width % 32) == 0)
+        return width / 8;
+      else
+        return 4 * (width/32 + 1);
+      break;
+
+    case 4:
+      if ((width % 8) == 0)
+        return width / 2;
+      else
+        return 4 * (width/8 + 1);
+      break;
+
+    case 8:
+      if ((width % 4) == 0)
+        return width;
+      else
+        return 4 * (width/4 + 1);
+      break;
+
+    case 24:
+      if (((width*3) % 4) == 0)
+        return width * 3;
+      else
+        return 4 * (width*3/4+1);
+
+    case 32:
+      return width * 4;
+
+    default:
+      g_warning ("invalid bitrate: %d\n", bpp);
+      g_assert_not_reached ();
+      return width * (bpp/8);
+    }
+}
+
+guint8 *
+ico_alloc_map (gint  width,
+               gint  height,
+               gint  bpp,
+               gint *length)
+{
+  gint    len = 0;
+  guint8 *map = NULL;
+
+  len = ico_rowstride (width, bpp) * height;
+
+  *length = len;
+  map = g_new0 (guint8, len);
+
+  return map;
+}
diff --git a/plug-ins/file-ico/ico.h b/plug-ins/file-ico/ico.h
new file mode 100644
index 0000000..65a217c
--- /dev/null
+++ b/plug-ins/file-ico/ico.h
@@ -0,0 +1,110 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * GIMP Plug-in for Windows Icon files.
+ * Copyright (C) 2002 Christian Kreibich <christian@whoop.org>.
+ *
+ * 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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ICO_H__
+#define __ICO_H__
+
+
+#ifdef ICO_DBG
+#define D(x) \
+{ \
+  printf("ICO plugin: "); \
+  printf x; \
+}
+#else
+#define D(x)
+#endif
+
+#define PLUG_IN_BINARY      "file-ico"
+#define PLUG_IN_ROLE        "gimp-file-ico"
+
+#define ICO_PNG_MAGIC       0x474e5089
+#define ICO_ALPHA_THRESHOLD 127
+#define ICO_MAXBUF          4096
+
+
+typedef struct _IcoFileHeader
+{
+  guint16   reserved;
+  guint16   resource_type;
+  guint16   icon_count;
+} IcoFileHeader;
+
+typedef struct _IcoFileEntry
+{
+  guint8        width;      /* Width of icon in pixels */
+  guint8        height;    /* Height of icon in pixels */
+  guint8        num_colors; /* Number of colors of paletted image */
+  guint8        reserved;   /* Must be 0 */
+  guint16       planes;     /* Must be 1 */
+  guint16       bpp;        /* 1, 4, 8, 24 or 32 bits per pixel */
+  guint32       size;       /* Size of icon (including data header) */
+  guint32       offset;     /* Absolute offset of data in a file */
+ } IcoFileEntry;
+
+typedef struct _IcoFileDataHeader
+{
+  guint32       header_size; /* 40 bytes */
+  guint32       width;       /* Width of image in pixels */
+  guint32       height;      /* Height of image in pixels */
+  guint16       planes;      /* Must be 1 */
+  guint16       bpp;
+  guint32       compression; /* Not used for icons */
+  guint32       image_size;  /* Size of image (without this header) */
+  guint32       x_res;
+  guint32       y_res;
+  guint32       used_clrs;
+  guint32       important_clrs;
+} IcoFileDataHeader;
+
+
+typedef struct _IcoLoadInfo
+{
+    guint    width;
+    guint    height;
+    gint     bpp;
+    gint     offset;
+    gint     size;
+} IcoLoadInfo;
+
+typedef struct _IcoSaveInfo
+{
+    gint        *depths;
+    gint        *default_depths;
+    gboolean    *compress;
+    gint        *layers;
+    gint         num_icons;
+} IcoSaveInfo;
+
+
+/* Miscellaneous helper functions below: */
+
+gint     ico_rowstride (gint width,
+                        gint bpp);
+
+/* Allocates a 32-bit padded bitmap for various color depths.
+   Returns the allocated array directly, and the length of the
+   array in the len pointer */
+guint8 * ico_alloc_map  (gint     width,
+                         gint     height,
+                         gint     bpp,
+                         gint    *len);
+
+#endif /* __ICO_H__ */