Adding upstream version 2.10.22.upstream/2.10.22upstream

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

11 files changed, 2143 insertions, 0 deletions

diff --git a/plug-ins/pagecurl/Makefile.am b/plug-ins/pagecurl/Makefile.am
new file mode 100644
index 0000000..4640fe0
--- /dev/null
+++ b/plug-ins/pagecurl/Makefile.am
@@ -0,0 +1,82 @@
+## Process this file with automake to produce Makefile.in
+
+if OS_WIN32
+mwindows = -mwindows
+else
+libm = -lm
+endif
+
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+libgimpconfig = $(top_builddir)/libgimpconfig/libgimpconfig-$(GIMP_API_VERSION).la
+libgimpwidgets = $(top_builddir)/libgimpwidgets/libgimpwidgets-$(GIMP_API_VERSION).la
+libgimp = $(top_builddir)/libgimp/libgimp-$(GIMP_API_VERSION).la
+libgimpcolor = $(top_builddir)/libgimpcolor/libgimpcolor-$(GIMP_API_VERSION).la
+libgimpmath = $(top_builddir)/libgimpmath/libgimpmath-$(GIMP_API_VERSION).la
+libgimpbase = $(top_builddir)/libgimpbase/libgimpbase-$(GIMP_API_VERSION).la
+
+if HAVE_WINDRES
+include $(top_srcdir)/build/windows/gimprc-plug-ins.rule
+pagecurl_RC = pagecurl.rc.o
+endif
+
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+
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+
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+
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+
+BUILT_SOURCES = pagecurl-icons.c
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)	\
+	$(GTK_CFLAGS)	\
+	$(GEGL_CFLAGS) \
+	-I$(includedir)
+
+LDADD = \
+	$(libm)			\
+	$(libgimpui)		\
+	$(libgimpwidgets)	\
+	$(libgimpconfig)	\
+	$(libgimp)		\
+	$(libgimpcolor)		\
+	$(libgimpmath)		\
+	$(libgimpbase)		\
+	$(GTK_LIBS)		\
+	$(GEGL_LIBS)		\
+	$(RT_LIBS)		\
+	$(INTLLIBS)		\
+	$(pagecurl_RC)
+
+
+PAGECURL_IMAGES = \
+	curl0.png	\
+	curl1.png	\
+	curl2.png	\
+	curl3.png	\
+	curl4.png	\
+	curl5.png	\
+	curl6.png	\
+	curl7.png
+
+EXTRA_DIST = $(PAGECURL_IMAGES)
+
+CLEANFILES = $(BUILT_SOURCES) pagecurl-icons.gresource.xml
+
+pagecurl-icons.gresource.xml: $(PAGECURL_IMAGES) Makefile.am
+	$(AM_V_GEN) ( rm -f $@; \
+	  echo '<?xml version="1.0" encoding="UTF-8"?>' > $@; \
+	  echo '<gresources>' >> $@; \
+	  echo '  <gresource prefix="/org/gimp/pagecurl-icons">' >> $@; \
+	  for image in $(PAGECURL_IMAGES); do \
+	    echo "    <file preprocess=\"to-pixdata\">$$image</file>" >> $@; \
+	  done; \
+	  echo '  </gresource>' >> $@; \
+	  echo '</gresources>' >> $@ )
+
+pagecurl-icons.c: pagecurl-icons.gresource.xml
+	$(AM_V_GEN) $(HOST_GLIB_COMPILE_RESOURCES) \
+	  --sourcedir=$(srcdir) --generate-source \
+	  --target=$@ pagecurl-icons.gresource.xml
diff --git a/plug-ins/pagecurl/Makefile.in b/plug-ins/pagecurl/Makefile.in
new file mode 100644
index 0000000..e259d57
--- /dev/null
+++ b/plug-ins/pagecurl/Makefile.in
@@ -0,0 +1,1033 @@
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+check-am: all-am
+check: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) check-am
+all-am: Makefile $(PROGRAMS)
+installdirs:
+	for dir in "$(DESTDIR)$(libexecdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) 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:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+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."
+	-test -z "$(BUILT_SOURCES)" || rm -f $(BUILT_SOURCES)
+clean: clean-am
+
+clean-am: clean-generic clean-libexecPROGRAMS clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/pagecurl.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-libexecPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/pagecurl.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-libexecPROGRAMS
+
+.MAKE: all check install 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) $@
+
+pagecurl-icons.gresource.xml: $(PAGECURL_IMAGES) Makefile.am
+	$(AM_V_GEN) ( rm -f $@; \
+	  echo '<?xml version="1.0" encoding="UTF-8"?>' > $@; \
+	  echo '<gresources>' >> $@; \
+	  echo '  <gresource prefix="/org/gimp/pagecurl-icons">' >> $@; \
+	  for image in $(PAGECURL_IMAGES); do \
+	    echo "    <file preprocess=\"to-pixdata\">$$image</file>" >> $@; \
+	  done; \
+	  echo '  </gresource>' >> $@; \
+	  echo '</gresources>' >> $@ )
+
+pagecurl-icons.c: pagecurl-icons.gresource.xml
+	$(AM_V_GEN) $(HOST_GLIB_COMPILE_RESOURCES) \
+	  --sourcedir=$(srcdir) --generate-source \
+	  --target=$@ pagecurl-icons.gresource.xml
+
+# 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/pagecurl/curl0.png b/plug-ins/pagecurl/curl0.png
new file mode 100644
index 0000000..f136c61
--- /dev/null
+++ b/plug-ins/pagecurl/curl0.png
diff --git a/plug-ins/pagecurl/curl1.png b/plug-ins/pagecurl/curl1.png
new file mode 100644
index 0000000..d54f7e6
--- /dev/null
+++ b/plug-ins/pagecurl/curl1.png
diff --git a/plug-ins/pagecurl/curl2.png b/plug-ins/pagecurl/curl2.png
new file mode 100644
index 0000000..0553acb
--- /dev/null
+++ b/plug-ins/pagecurl/curl2.png
diff --git a/plug-ins/pagecurl/curl3.png b/plug-ins/pagecurl/curl3.png
new file mode 100644
index 0000000..f4d94a7
--- /dev/null
+++ b/plug-ins/pagecurl/curl3.png
diff --git a/plug-ins/pagecurl/curl4.png b/plug-ins/pagecurl/curl4.png
new file mode 100644
index 0000000..0a5413c
--- /dev/null
+++ b/plug-ins/pagecurl/curl4.png
diff --git a/plug-ins/pagecurl/curl5.png b/plug-ins/pagecurl/curl5.png
new file mode 100644
index 0000000..30d3232
--- /dev/null
+++ b/plug-ins/pagecurl/curl5.png
diff --git a/plug-ins/pagecurl/curl6.png b/plug-ins/pagecurl/curl6.png
new file mode 100644
index 0000000..bed61cb
--- /dev/null
+++ b/plug-ins/pagecurl/curl6.png
diff --git a/plug-ins/pagecurl/curl7.png b/plug-ins/pagecurl/curl7.png
new file mode 100644
index 0000000..12dae05
--- /dev/null
+++ b/plug-ins/pagecurl/curl7.png
diff --git a/plug-ins/pagecurl/pagecurl.c b/plug-ins/pagecurl/pagecurl.c
new file mode 100644
index 0000000..c82dc8a
--- /dev/null
+++ b/plug-ins/pagecurl/pagecurl.c
@@ -0,0 +1,1028 @@
+/* Page Curl 0.9 --- image filter plug-in for GIMP
+ * Copyright (C) 1996 Federico Mena Quintero
+ * Ported to Gimp 1.0 1998 by Simon Budig <Simon.Budig@unix-ag.org>
+ *
+ * You can contact me at quartic@polloux.fciencias.unam.mx
+ * You can contact the original GIMP authors at gimp@xcf.berkeley.edu
+ *
+ * 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/>.
+ *
+ */
+
+/*
+ * Ported to the 0.99.x architecture by Simon Budig, Simon.Budig@unix-ag.org
+ */
+
+/*
+ * Version History
+ * 0.5: (1996) Version for Gimp 0.54 by Federico Mena Quintero
+ * 0.6: (Feb '98) First Version for Gimp 0.99.x, very buggy.
+ * 0.8: (Mar '98) First "stable" version
+ * 0.9: (May '98)
+ *      - Added support for Gradients. It is now possible to map
+ *        a gradient to the back of the curl.
+ *      - This implies a changed PDB-Interface: New "mode" parameter.
+ *      - Pagecurl now returns the ID of the new layer.
+ *      - Exchanged the meaning of FG/BG Color, because mostly the FG
+ *        color is darker.
+ * 1.0: (July '04)
+ *      - Code cleanup, added reverse gradient option.
+ */
+#include "config.h"
+
+#include <libgimp/gimp.h>
+#include <libgimp/gimpui.h>
+
+#include "libgimp/stdplugins-intl.h"
+
+#include "pagecurl-icons.c"
+
+
+#define PLUG_IN_PROC    "plug-in-pagecurl"
+#define PLUG_IN_BINARY  "pagecurl"
+#define PLUG_IN_ROLE    "gimp-pagecurl"
+#define PLUG_IN_VERSION "July 2004, 1.0"
+#define NGRADSAMPLES    256
+
+
+typedef enum
+{
+  CURL_COLORS_FG_BG,
+  CURL_COLORS_GRADIENT,
+  CURL_COLORS_GRADIENT_REVERSE,
+  CURL_COLORS_LAST = CURL_COLORS_GRADIENT_REVERSE
+} CurlColors;
+
+typedef enum
+{
+  CURL_ORIENTATION_VERTICAL,
+  CURL_ORIENTATION_HORIZONTAL,
+  CURL_ORIENTATION_LAST = CURL_ORIENTATION_HORIZONTAL
+} CurlOrientation;
+
+typedef enum
+{
+  CURL_EDGE_LOWER_RIGHT = 1,
+  CURL_EDGE_LOWER_LEFT  = 2,
+  CURL_EDGE_UPPER_LEFT  = 3,
+  CURL_EDGE_UPPER_RIGHT = 4,
+  CURL_EDGE_FIRST       = CURL_EDGE_LOWER_RIGHT,
+  CURL_EDGE_LAST        = CURL_EDGE_UPPER_RIGHT
+} CurlEdge;
+
+
+#define CURL_EDGE_LEFT(e)  ((e) == CURL_EDGE_LOWER_LEFT  || \
+                            (e) == CURL_EDGE_UPPER_LEFT)
+#define CURL_EDGE_RIGHT(e) ((e) == CURL_EDGE_LOWER_RIGHT || \
+                            (e) == CURL_EDGE_UPPER_RIGHT)
+#define CURL_EDGE_LOWER(e) ((e) == CURL_EDGE_LOWER_RIGHT || \
+                            (e) == CURL_EDGE_LOWER_LEFT)
+#define CURL_EDGE_UPPER(e) ((e) == CURL_EDGE_UPPER_LEFT  || \
+                            (e) == CURL_EDGE_UPPER_RIGHT)
+
+
+/***** Types *****/
+
+typedef struct
+{
+  CurlColors       colors;
+  gdouble          opacity;
+  gboolean         shade;
+  CurlEdge         edge;
+  CurlOrientation  orientation;
+} CurlParams;
+
+
+/***** Prototypes *****/
+
+static void      query                 (void);
+static void      run                   (const gchar      *name,
+                                        gint              nparams,
+                                        const GimpParam  *param,
+                                        gint             *nreturn_vals,
+                                        GimpParam       **return_vals);
+static void       set_default_params   (void);
+
+static void       dialog_scale_update  (GtkAdjustment    *adjustment,
+                                        gdouble          *value);
+
+static gboolean   dialog               (void);
+
+static void       init_calculation     (gint32            drawable_id);
+static gint32     do_curl_effect       (gint32            drawable_id);
+static void       clear_curled_region  (gint32            drawable_id);
+static gint32     page_curl            (gint32            drawable_id);
+static GimpRGB  * get_gradient_samples (gint32            drawable_id,
+                                        gboolean          reverse);
+
+
+/***** Variables *****/
+
+const GimpPlugInInfo PLUG_IN_INFO =
+{
+  NULL,  /* init_proc  */
+  NULL,  /* quit_proc  */
+  query, /* query_proc */
+  run    /* run_proc   */
+};
+
+static CurlParams curl;
+
+/* Image parameters */
+
+static gint32        image_id;
+
+static GtkWidget *curl_image = NULL;
+
+static gint   sel_x, sel_y;
+static gint   true_sel_width, true_sel_height;
+static gint   sel_width, sel_height;
+static gint   drawable_position;
+
+/* Center and radius of circle */
+
+static GimpVector2 center;
+static double      radius;
+
+/* Useful points to keep around */
+
+static GimpVector2 left_tangent;
+static GimpVector2 right_tangent;
+
+/* Slopes --- these are *not* in the usual geometric sense! */
+
+static gdouble diagl_slope;
+static gdouble diagr_slope;
+static gdouble diagb_slope;
+static gdouble diagm_slope;
+
+/* User-configured parameters */
+
+static GimpRGB fg_color;
+static GimpRGB bg_color;
+
+
+/***** Functions *****/
+
+MAIN ()
+
+static void
+query (void)
+{
+  static const GimpParamDef 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",    "Input drawable"                       },
+    { GIMP_PDB_INT32,    "colors",      "FG- and BG-Color (0), Current gradient (1), Current gradient reversed (2)" },
+    { GIMP_PDB_INT32,    "edge",
+        "Edge to curl (1-4, clockwise, starting in the lower right edge)"   },
+    { GIMP_PDB_INT32,    "orientation", "Vertical (0), Horizontal (1)"         },
+    { GIMP_PDB_INT32,    "shade",
+        "Shade the region under the curl (1) or not (0)"                    },
+  };
+
+  static const GimpParamDef return_vals[] =
+  {
+    { GIMP_PDB_LAYER, "curl-layer", "The new layer with the curl." }
+  };
+
+  gimp_install_procedure (PLUG_IN_PROC,
+                          N_("Curl up one of the image corners"),
+                          "This plug-in creates a pagecurl-effect.",
+                          "Federico Mena Quintero and Simon Budig",
+                          "Federico Mena Quintero and Simon Budig",
+                          PLUG_IN_VERSION,
+                          N_("_Pagecurl..."),
+                          "RGB*, GRAY*",
+                          GIMP_PLUGIN,
+                          G_N_ELEMENTS (args),
+                          G_N_ELEMENTS (return_vals),
+                          args,
+                          return_vals);
+
+  gimp_plugin_menu_register (PLUG_IN_PROC, "<Image>/Filters/Distorts");
+}
+
+static void
+run (const gchar      *name,
+     gint              nparams,
+     const GimpParam  *param,
+     gint             *nreturn_vals,
+     GimpParam       **return_vals)
+{
+  static GimpParam  values[2];
+  GimpRunMode       run_mode;
+  GimpPDBStatusType status = GIMP_PDB_SUCCESS;
+  gint32            drawable_id;
+
+  run_mode = param[0].data.d_int32;
+
+  INIT_I18N ();
+  gegl_init (NULL, NULL);
+
+  set_default_params ();
+
+  /*  Possibly retrieve data  */
+  gimp_get_data (PLUG_IN_PROC, &curl);
+
+  *nreturn_vals = 2;
+  *return_vals = values;
+
+  values[0].type = GIMP_PDB_STATUS;
+  values[0].data.d_status = status;
+  values[1].type = GIMP_PDB_LAYER;
+  values[1].data.d_layer = -1;
+
+  /*  Get the specified drawable  */
+  drawable_id = param[2].data.d_drawable;
+  image_id = param[1].data.d_image;
+
+  if ((gimp_drawable_is_rgb (drawable_id) ||
+       gimp_drawable_is_gray (drawable_id)) &&
+      gimp_drawable_mask_intersect (drawable_id, &sel_x, &sel_y,
+                                    &true_sel_width, &true_sel_height))
+    {
+      switch (run_mode)
+        {
+        case GIMP_RUN_INTERACTIVE:
+          /*  First acquire information with a dialog  */
+          if (! dialog ())
+            return;
+          break;
+
+        case GIMP_RUN_NONINTERACTIVE:
+          /*  Make sure all the arguments are there!  */
+          if (nparams != 7)
+            status = GIMP_PDB_CALLING_ERROR;
+
+          if (status == GIMP_PDB_SUCCESS)
+            {
+              curl.colors      = CLAMP (param[3].data.d_int32,
+                                        0, CURL_COLORS_LAST);
+              curl.edge        = CLAMP (param[4].data.d_int32,
+                                        CURL_EDGE_FIRST, CURL_EDGE_LAST);
+              curl.orientation = CLAMP (param[5].data.d_int32,
+                                        0, CURL_ORIENTATION_LAST);
+              curl.shade       = param[6].data.d_int32 ? TRUE : FALSE;
+            }
+          break;
+
+        case GIMP_RUN_WITH_LAST_VALS:
+          break;
+
+        default:
+          break;
+        }
+
+      if (status == GIMP_PDB_SUCCESS)
+        {
+          values[1].data.d_layer = page_curl (drawable_id);
+
+          if (run_mode != GIMP_RUN_NONINTERACTIVE)
+            gimp_displays_flush ();
+
+          if (run_mode == GIMP_RUN_INTERACTIVE)
+            gimp_set_data (PLUG_IN_PROC, &curl, sizeof (CurlParams));
+        }
+    }
+  else
+    /* Sorry - no indexed/noalpha images */
+    status = GIMP_PDB_EXECUTION_ERROR;
+
+  values[0].data.d_status = status;
+}
+
+/*****************************************************
+ * Functions to locate the current point in the curl.
+ *  The following functions assume an curl in the
+ *  lower right corner.
+ *  diagb crosses the two tangential points from the
+ *  circle with diagl and diagr.
+ *
+ *   +------------------------------------------------+
+ *   |                                          __-- /|
+ *   |                                      __--   _/ |
+ *   |                                  __--      /   |
+ *   |                              __--        _/    |
+ *   |                          __--           /      |
+ *   |                      __--____         _/       |
+ *   |                  __----~~    \      _/         |
+ *   |              __--             |   _/           |
+ *   |    diagl __--               _/| _/diagr        |
+ *   |      __--            diagm_/  |/               |
+ *   |  __--                    /___/                 |
+ *   +-------------------------+----------------------+
+ */
+
+static inline gboolean
+left_of_diagl (gdouble x,
+               gdouble y)
+{
+  return (x < (sel_width + (y - sel_height) * diagl_slope));
+}
+
+static inline gboolean
+right_of_diagr (gdouble x,
+                gdouble y)
+{
+  return (x > (sel_width + (y - sel_height) * diagr_slope));
+}
+
+static inline gboolean
+below_diagb (gdouble x,
+             gdouble y)
+{
+  return (y < (right_tangent.y + (x - right_tangent.x) * diagb_slope));
+}
+
+static inline gboolean
+right_of_diagm (gdouble x,
+                gdouble y)
+{
+  return (x > (sel_width + (y - sel_height) * diagm_slope));
+}
+
+static inline gboolean
+inside_circle (gdouble x,
+               gdouble y)
+{
+  x -= center.x;
+  y -= center.y;
+
+  return x * x + y * y <= radius * radius;
+}
+
+static void
+set_default_params (void)
+{
+  curl.colors      = CURL_COLORS_FG_BG;
+  curl.opacity     = 1.0;
+  curl.shade       = TRUE;
+  curl.edge        = CURL_EDGE_LOWER_RIGHT;
+  curl.orientation = CURL_ORIENTATION_VERTICAL;
+}
+
+/********************************************************************/
+/* dialog callbacks                                                 */
+/********************************************************************/
+
+static void
+dialog_scale_update (GtkAdjustment *adjustment,
+                     gdouble       *value)
+{
+  *value = ((gdouble) gtk_adjustment_get_value (adjustment)) / 100.0;
+}
+
+static void
+curl_pixbuf_update (void)
+{
+  GdkPixbuf *pixbuf;
+  gint       index;
+  gchar     *resource;
+
+  switch (curl.edge)
+    {
+    case CURL_EDGE_LOWER_RIGHT: index = 0; break;
+    case CURL_EDGE_LOWER_LEFT:  index = 1; break;
+    case CURL_EDGE_UPPER_RIGHT: index = 2; break;
+    case CURL_EDGE_UPPER_LEFT:  index = 3; break;
+    default:
+      return;
+    }
+
+  index += curl.orientation * 4;
+
+  resource = g_strdup_printf ("/org/gimp/pagecurl-icons/curl%c.png",
+                              '0' + index);
+  pixbuf = gdk_pixbuf_new_from_resource (resource, NULL);
+  g_free (resource);
+
+  gtk_image_set_from_pixbuf (GTK_IMAGE (curl_image), pixbuf);
+  g_object_unref (pixbuf);
+}
+
+static gboolean
+dialog (void)
+{
+  /* Missing options: Color-dialogs? / own curl layer ? / transparency
+     to original drawable / Warp-curl (unsupported yet) */
+
+  GtkWidget *dialog;
+  GtkWidget *hbox;
+  GtkWidget *vbox;
+  GtkWidget *table;
+  GtkWidget *frame;
+  GtkWidget *button;
+  GtkWidget *combo;
+  GtkObject *adjustment;
+  gboolean   run;
+
+  gimp_ui_init (PLUG_IN_BINARY, FALSE);
+
+  dialog = gimp_dialog_new (_("Pagecurl Effect"), PLUG_IN_ROLE,
+                            NULL, 0,
+                            gimp_standard_help_func, PLUG_IN_PROC,
+
+                            _("_Cancel"), GTK_RESPONSE_CANCEL,
+                            _("_OK"),     GTK_RESPONSE_OK,
+
+                            NULL);
+
+  gtk_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
+                                           GTK_RESPONSE_OK,
+                                           GTK_RESPONSE_CANCEL,
+                                           -1);
+
+  gimp_window_set_transient (GTK_WINDOW (dialog));
+
+  vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
+  gtk_container_set_border_width (GTK_CONTAINER (vbox), 12);
+  gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
+                      vbox, TRUE, TRUE, 0);
+  gtk_widget_show (vbox);
+
+  frame = gimp_frame_new (_("Curl Location"));
+  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+
+  table = gtk_table_new (3, 2, TRUE);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
+  gtk_table_set_row_spacings (GTK_TABLE (table), 6);
+  gtk_container_add (GTK_CONTAINER (frame), table);
+
+  curl_image = gtk_image_new ();
+
+  gtk_table_attach (GTK_TABLE (table), curl_image, 0, 2, 1, 2,
+                    GTK_SHRINK, GTK_SHRINK, 0, 0);
+  gtk_widget_show (curl_image);
+
+  curl_pixbuf_update ();
+
+  {
+    static const gchar *name[] =
+    {
+      N_("Lower right"),
+      N_("Lower left"),
+      N_("Upper left"),
+      N_("Upper right")
+    };
+    gint i;
+
+    button = NULL;
+    for (i = CURL_EDGE_FIRST; i <= CURL_EDGE_LAST; i++)
+      {
+        button =
+          gtk_radio_button_new_with_label (button == NULL ?
+                                           NULL :
+                                           gtk_radio_button_get_group (GTK_RADIO_BUTTON (button)),
+                                           gettext (name[i - CURL_EDGE_FIRST]));
+
+        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
+                                      curl.edge == i);
+
+        g_object_set_data (G_OBJECT (button),
+                           "gimp-item-data", GINT_TO_POINTER (i));
+
+        gtk_table_attach (GTK_TABLE (table), button,
+                          CURL_EDGE_LEFT  (i) ? 0 : 1,
+                          CURL_EDGE_LEFT  (i) ? 1 : 2,
+                          CURL_EDGE_UPPER (i) ? 0 : 2,
+                          CURL_EDGE_UPPER (i) ? 1 : 3,
+                          GTK_FILL | GTK_EXPAND, GTK_SHRINK, 0, 0);
+        gtk_widget_show (button);
+
+        g_signal_connect (button, "toggled",
+                          G_CALLBACK (gimp_radio_button_update),
+                          &curl.edge);
+
+        g_signal_connect (button, "toggled",
+                          G_CALLBACK (curl_pixbuf_update),
+                           NULL);
+      }
+  }
+
+  gtk_widget_show (table);
+  gtk_widget_show (frame);
+
+  frame = gimp_frame_new (_("Curl Orientation"));
+  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+
+  hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
+  gtk_box_set_homogeneous (GTK_BOX (hbox), TRUE);
+  gtk_container_add (GTK_CONTAINER (frame), hbox);
+
+  {
+    static const gchar *name[] =
+    {
+      N_("_Vertical"),
+      N_("_Horizontal")
+    };
+    gint i;
+
+    button = NULL;
+    for (i = 0; i <= CURL_ORIENTATION_LAST; i++)
+      {
+        button = gtk_radio_button_new_with_mnemonic (button == NULL ?
+                                                     NULL :
+                                                     gtk_radio_button_get_group (GTK_RADIO_BUTTON (button)),
+                                                     gettext (name[i]));
+
+        gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button),
+                                      curl.orientation == i);
+
+        g_object_set_data (G_OBJECT (button),
+                           "gimp-item-data", GINT_TO_POINTER (i));
+
+        gtk_box_pack_end (GTK_BOX (hbox), button, TRUE, TRUE, 0);
+        gtk_widget_show (button);
+
+        g_signal_connect (button, "toggled",
+                          G_CALLBACK (gimp_radio_button_update),
+                          &curl.orientation);
+
+        g_signal_connect (button, "toggled",
+                          G_CALLBACK (curl_pixbuf_update),
+                          NULL);
+      }
+  }
+
+  gtk_widget_show (hbox);
+  gtk_widget_show (frame);
+
+  button = gtk_check_button_new_with_mnemonic (_("_Shade under curl"));
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), curl.shade);
+  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
+  gtk_widget_show (button);
+
+  g_signal_connect (button, "toggled",
+                    G_CALLBACK (gimp_toggle_button_update),
+                    &curl.shade);
+
+  combo = g_object_new (GIMP_TYPE_INT_COMBO_BOX, NULL);
+
+  gimp_int_combo_box_prepend (GIMP_INT_COMBO_BOX (combo),
+                              GIMP_INT_STORE_VALUE,     CURL_COLORS_GRADIENT_REVERSE,
+                              GIMP_INT_STORE_LABEL,     _("Current gradient (reversed)"),
+                              GIMP_INT_STORE_ICON_NAME, GIMP_ICON_GRADIENT,
+                              -1);
+  gimp_int_combo_box_prepend (GIMP_INT_COMBO_BOX (combo),
+                              GIMP_INT_STORE_VALUE,     CURL_COLORS_GRADIENT,
+                              GIMP_INT_STORE_LABEL,     _("Current gradient"),
+                              GIMP_INT_STORE_ICON_NAME, GIMP_ICON_GRADIENT,
+                              -1);
+  gimp_int_combo_box_prepend (GIMP_INT_COMBO_BOX (combo),
+                              GIMP_INT_STORE_VALUE,     CURL_COLORS_FG_BG,
+                              GIMP_INT_STORE_LABEL,     _("Foreground / background colors"),
+                              GIMP_INT_STORE_ICON_NAME, GIMP_ICON_COLORS_DEFAULT,
+                              -1);
+
+  gtk_box_pack_start (GTK_BOX (vbox), combo, FALSE, FALSE, 0);
+  gtk_widget_show (combo);
+
+  gimp_int_combo_box_connect (GIMP_INT_COMBO_BOX (combo),
+                              curl.colors,
+                              G_CALLBACK (gimp_int_combo_box_get_active),
+                              &curl.colors);
+
+  gtk_widget_show (dialog);
+
+  table = gtk_table_new (1, 3, FALSE);
+  gtk_table_set_col_spacings (GTK_TABLE (table), 6);
+  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);
+  gtk_widget_show (table);
+
+  adjustment = gimp_scale_entry_new (GTK_TABLE (table), 0, 0,
+                                     _("_Opacity:"), 100, 0,
+                                     curl.opacity * 100.0, 0.0, 100.0,
+                                     1.0, 1.0, 0.0,
+                                     TRUE, 0, 0,
+                                     NULL, NULL);
+  g_signal_connect (adjustment, "value-changed",
+                    G_CALLBACK (dialog_scale_update),
+                    &curl.opacity);
+
+  run = (gimp_dialog_run (GIMP_DIALOG (dialog)) == GTK_RESPONSE_OK);
+
+  gtk_widget_destroy (dialog);
+
+  return run;
+}
+
+static void
+init_calculation (gint32 drawable_id)
+{
+  gdouble      k;
+  gdouble      alpha, beta;
+  gdouble      angle;
+  GimpVector2  v1, v2;
+  gint32      *image_layers;
+  gint32       nlayers;
+
+  gimp_layer_add_alpha (drawable_id);
+
+  /* Image parameters */
+
+  /* Determine Position of original Layer in the Layer stack. */
+
+  image_layers = gimp_image_get_layers (image_id, &nlayers);
+  drawable_position = 0;
+  while (drawable_position < nlayers &&
+         image_layers[drawable_position] != drawable_id)
+    drawable_position++;
+
+  switch (curl.orientation)
+    {
+    case CURL_ORIENTATION_VERTICAL:
+      sel_width  = true_sel_width;
+      sel_height = true_sel_height;
+      break;
+
+    case CURL_ORIENTATION_HORIZONTAL:
+      sel_width  = true_sel_height;
+      sel_height = true_sel_width;
+      break;
+    }
+
+  /* Circle parameters */
+
+  alpha = atan ((double) sel_height / sel_width);
+  beta = alpha / 2.0;
+  k = sel_width / ((G_PI + alpha) * sin (beta) + cos (beta));
+  gimp_vector2_set (&center, k * cos (beta), k * sin (beta));
+  radius = center.y;
+
+  /* left_tangent  */
+
+  gimp_vector2_set (&left_tangent, radius * -sin (alpha), radius * cos (alpha));
+  gimp_vector2_add (&left_tangent, &left_tangent, &center);
+
+  /* right_tangent */
+
+  gimp_vector2_sub (&v1, &left_tangent, &center);
+  gimp_vector2_set (&v2, sel_width - center.x, sel_height - center.y);
+  angle = -2.0 * acos (gimp_vector2_inner_product (&v1, &v2) /
+                       (gimp_vector2_length (&v1) *
+                        gimp_vector2_length (&v2)));
+  gimp_vector2_set (&right_tangent,
+                    v1.x * cos (angle) + v1.y * -sin (angle),
+                    v1.x * sin (angle) + v1.y * cos (angle));
+  gimp_vector2_add (&right_tangent, &right_tangent, &center);
+
+  /* Slopes */
+
+  diagl_slope = (double) sel_width / sel_height;
+  diagr_slope = (sel_width - right_tangent.x) / (sel_height - right_tangent.y);
+  diagb_slope = ((right_tangent.y - left_tangent.y) /
+                 (right_tangent.x - left_tangent.x));
+  diagm_slope = (sel_width - center.x) / sel_height;
+
+  /* Colors */
+
+  gimp_context_get_foreground (&fg_color);
+  gimp_context_get_background (&bg_color);
+}
+
+static gint32
+do_curl_effect (gint32 drawable_id)
+{
+  gint          x = 0;
+  gint          y = 0;
+  gboolean      color_image;
+  gint          x1, y1;
+  guint         progress, max_progress;
+  gdouble       intensity, alpha;
+  GimpVector2   v, dl, dr;
+  gdouble       dl_mag, dr_mag, angle, factor;
+  GeglBuffer   *curl_buffer;
+  gint32        curl_layer_id;
+  GimpRGB      *grad_samples = NULL;
+  gint          width, height, n_ch;
+  GeglRectangle *roi;
+  GeglBufferIterator *iter;
+  const Babl         *format;
+
+  color_image = gimp_drawable_is_rgb (drawable_id);
+
+  curl_layer_id = gimp_layer_new (image_id,
+                                  _("Curl Layer"),
+                                  true_sel_width,
+                                  true_sel_height,
+                                  color_image ?
+                                  GIMP_RGBA_IMAGE : GIMP_GRAYA_IMAGE,
+                                  100,
+                                  gimp_image_get_default_new_layer_mode (image_id));
+
+  gimp_image_insert_layer (image_id, curl_layer_id,
+                           gimp_item_get_parent (drawable_id),
+                           drawable_position);
+  gimp_drawable_fill (curl_layer_id, GIMP_FILL_TRANSPARENT);
+
+  gimp_drawable_offsets (drawable_id, &x1, &y1);
+  gimp_layer_set_offsets (curl_layer_id, sel_x + x1, sel_y + y1);
+
+  curl_buffer = gimp_drawable_get_shadow_buffer (curl_layer_id);
+
+  width  = gegl_buffer_get_width (curl_buffer);
+  height = gegl_buffer_get_height (curl_buffer);
+  format = babl_format ("R'G'B'A float");
+  n_ch   = babl_format_get_n_components (format);
+
+  iter = gegl_buffer_iterator_new (curl_buffer,
+                                   GEGL_RECTANGLE (0, 0, width, height), 0,
+                                   format,
+                                   GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 1);
+
+  /* Init shade_under */
+  gimp_vector2_set (&dl, -sel_width, -sel_height);
+  dl_mag = gimp_vector2_length (&dl);
+  gimp_vector2_set (&dr,
+                    -(sel_width - right_tangent.x),
+                    -(sel_height - right_tangent.y));
+  dr_mag = gimp_vector2_length (&dr);
+  alpha = acos (gimp_vector2_inner_product (&dl, &dr) / (dl_mag * dr_mag));
+
+  /* Gradient Samples */
+  switch (curl.colors)
+    {
+    case CURL_COLORS_FG_BG:
+      break;
+    case CURL_COLORS_GRADIENT:
+      grad_samples = get_gradient_samples (curl_layer_id, FALSE);
+      break;
+    case CURL_COLORS_GRADIENT_REVERSE:
+      grad_samples = get_gradient_samples (curl_layer_id, TRUE);
+      break;
+    }
+
+  max_progress = 2 * sel_width * sel_height;
+  progress = 0;
+
+  /* Main loop */
+  while (gegl_buffer_iterator_next (iter))
+    {
+      gfloat *dest;
+
+      roi = &iter->items[0].roi;
+      dest = (gfloat *) iter->items[0].data;
+
+      for (y1 = roi->y; y1 < roi->y + roi->height; y1++)
+        {
+          GimpRGB color;
+
+          for (x1 = roi->x; x1 < roi->x + roi->width; x1++)
+            {
+              /* Map coordinates to get the curl correct... */
+              switch (curl.orientation)
+                {
+                case CURL_ORIENTATION_VERTICAL:
+                  x = CURL_EDGE_RIGHT (curl.edge) ? x1 : sel_width  - 1 - x1;
+                  y = CURL_EDGE_UPPER (curl.edge) ? y1 : sel_height - 1 - y1;
+                  break;
+
+                case CURL_ORIENTATION_HORIZONTAL:
+                  x = CURL_EDGE_LOWER (curl.edge) ? y1 : sel_width  - 1 - y1;
+                  y = CURL_EDGE_LEFT  (curl.edge) ? x1 : sel_height - 1 - x1;
+                  break;
+                }
+
+              if (left_of_diagl (x, y))
+                { /* uncurled region: transparent black */
+                  gimp_rgba_set (&color, 0, 0, 0, 0);
+                }
+              else if (right_of_diagr (x, y) ||
+                       (right_of_diagm (x, y) &&
+                        below_diagb (x, y) &&
+                        !inside_circle (x, y)))
+                {
+                  /* curled region: transparent black */
+                  gimp_rgba_set (&color, 0, 0, 0, 0);
+                }
+              else
+                {
+                  v.x = -(sel_width - x);
+                  v.y = -(sel_height - y);
+                  angle = acos (gimp_vector2_inner_product (&v, &dl) /
+                                (gimp_vector2_length (&v) * dl_mag));
+
+                  if (inside_circle (x, y) || below_diagb (x, y))
+                    {
+                      /* Below the curl. */
+                      factor = angle / alpha;
+                      gimp_rgba_set (&color, 0, 0, 0, curl.shade ? factor : 0);
+                    }
+                  else
+                    {
+                      GimpRGB *gradrgb;
+
+                      /* On the curl */
+                      switch (curl.colors)
+                        {
+                        case CURL_COLORS_FG_BG:
+                          intensity = pow (sin (G_PI * angle / alpha), 1.5);
+                          gimp_rgba_set (&color,
+                                         intensity * bg_color.r + (1.0 - intensity) * fg_color.r,
+                                         intensity * bg_color.g + (1.0 - intensity) * fg_color.g,
+                                         intensity * bg_color.b + (1.0 - intensity) * fg_color.b,
+                                         (1.0 - intensity * (1.0 - curl.opacity)));
+                          break;
+
+                        case CURL_COLORS_GRADIENT:
+                        case CURL_COLORS_GRADIENT_REVERSE:
+                          /* Calculate position in Gradient */
+                          intensity = (angle/alpha) + sin (G_PI*2 * angle/alpha) * 0.075;
+
+                          gradrgb = grad_samples + ((guint) (intensity * NGRADSAMPLES));
+
+                          /* Check boundaries */
+                          intensity = CLAMP (intensity, 0.0, 1.0);
+                          color = *gradrgb;
+                          color.a = gradrgb->a * (1.0 - intensity * (1.0 - curl.opacity));
+                          break;
+                        }
+                    }
+                }
+
+              dest[0] = color.r;
+              dest[1] = color.g;
+              dest[2] = color.b;
+              dest[3] = color.a;
+
+              dest += n_ch;
+            }
+        }
+      progress += roi->width * roi->height;
+      gimp_progress_update ((double) progress / (double) max_progress);
+    }
+
+  gimp_progress_update (0.5);
+  gegl_buffer_flush (curl_buffer);
+  gimp_drawable_merge_shadow (curl_layer_id, FALSE);
+  gimp_drawable_update (curl_layer_id, 0, 0, width, height);
+
+  g_free (grad_samples);
+
+  return curl_layer_id;
+}
+
+/************************************************/
+
+static void
+clear_curled_region (gint32 drawable_id)
+{
+  gint          x = 0;
+  gint          y = 0;
+  guint         x1, y1;
+  gfloat       *dest, *src;
+  guint         progress, max_progress;
+  GeglBuffer   *buf;
+  GeglBuffer   *shadow_buf;
+  GeglRectangle *roi;
+  GeglBufferIterator *iter;
+  const Babl   *format;
+  gint          width, height, bpp, n_ch;
+  gint          buf_index;
+
+  max_progress = 2 * sel_width * sel_height;
+  progress = max_progress / 2;
+
+  buf        = gimp_drawable_get_buffer (drawable_id);
+  shadow_buf = gimp_drawable_get_shadow_buffer (drawable_id);
+  width  = gegl_buffer_get_width (buf);
+  height = gegl_buffer_get_height (buf);
+
+  format = babl_format ("R'G'B'A float");
+  bpp    = babl_format_get_bytes_per_pixel (format);
+  n_ch   = babl_format_get_n_components (format);
+
+  iter = gegl_buffer_iterator_new (shadow_buf,
+                                   GEGL_RECTANGLE (0, 0, width, height), 0,
+                                   format,
+                                   GEGL_ACCESS_WRITE, GEGL_ABYSS_NONE, 2);
+  buf_index = gegl_buffer_iterator_add (iter, buf, NULL, 0,
+                                        format,
+                                        GEGL_ACCESS_READ, GEGL_ABYSS_NONE);
+
+  while (gegl_buffer_iterator_next (iter))
+    {
+      roi  = &iter->items[0].roi;
+      dest = iter->items[0].data;
+      src  = iter->items[buf_index].data;
+
+      memcpy (dest, src, roi->width * roi->height * bpp);
+
+      for (y1 = roi->y; y1 < roi->y + roi->height; y1++)
+        {
+          for (x1 = roi->x; x1 < roi->x + roi->width; x1++)
+            {
+              /* Map coordinates to get the curl correct... */
+              switch (curl.orientation)
+                {
+                case CURL_ORIENTATION_VERTICAL:
+                  x = (CURL_EDGE_RIGHT (curl.edge) ?
+                       x1 - sel_x : sel_width  - 1 - (x1 - sel_x));
+                  y = (CURL_EDGE_UPPER (curl.edge) ?
+                       y1 - sel_y : sel_height - 1 - (y1 - sel_y));
+                  break;
+
+                case CURL_ORIENTATION_HORIZONTAL:
+                  x = (CURL_EDGE_LOWER (curl.edge) ?
+                       y1 - sel_y : sel_width - 1 - (y1 - sel_y));
+                  y = (CURL_EDGE_LEFT (curl.edge)  ?
+                       x1 - sel_x : sel_height - 1 - (x1 - sel_x));
+                  break;
+                }
+
+              if (right_of_diagr (x, y) ||
+                  (right_of_diagm (x, y) &&
+                   below_diagb (x, y) &&
+                   !inside_circle (x, y)))
+                {
+                  /* Right of the curl: Alpha = 0 */
+                  dest[0] = src[0];
+                  dest[1] = src[1];
+                  dest[2] = src[2];
+                  dest[3] = 0.0;
+                }
+
+              dest += n_ch;
+              src += n_ch;
+            }
+        }
+
+      progress += roi->width * roi->height;
+      gimp_progress_update ((double) progress / (double) max_progress);
+    }
+
+  gimp_progress_update (1.0);
+  gegl_buffer_flush (shadow_buf);
+  gimp_drawable_merge_shadow (drawable_id, TRUE);
+  gimp_drawable_update (drawable_id,
+                        sel_x, sel_y,
+                        true_sel_width, true_sel_height);
+}
+
+static gint32
+page_curl (gint32 drawable_id)
+{
+  gint curl_layer_id;
+
+  gimp_image_undo_group_start (image_id);
+
+  gimp_progress_init (_("Page Curl"));
+
+  init_calculation (drawable_id);
+
+  curl_layer_id = do_curl_effect (drawable_id);
+
+  clear_curled_region (drawable_id);
+
+  gimp_image_undo_group_end (image_id);
+
+  return curl_layer_id;
+}
+
+/*
+  Returns NGRADSAMPLES samples of active gradient.
+  Each sample has (gimp_drawable_bpp (drawable_id)) bytes.
+  "ripped" from gradmap.c.
+ */
+static GimpRGB *
+get_gradient_samples (gint32    drawable_id,
+                      gboolean  reverse)
+{
+  gchar   *gradient_name;
+  gint     n_d_samples;
+  gdouble *d_samples = NULL;
+  GimpRGB *rgba;
+  gint     i;
+
+  gradient_name = gimp_context_get_gradient ();
+
+  gimp_gradient_get_uniform_samples (gradient_name, NGRADSAMPLES, reverse,
+                                     &n_d_samples, &d_samples);
+
+  rgba = g_new0 (GimpRGB, NGRADSAMPLES);
+  for (i = 0; i < NGRADSAMPLES; i++)
+    {
+      gimp_rgba_set (rgba + i,
+                     d_samples[i*4 + 0],
+                     d_samples[i*4 + 1],
+                     d_samples[i*4 + 2],
+                     d_samples[i*4 + 3]);
+    }
+
+  g_free (gradient_name);
+
+  return rgba;
+}