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-rw-r--r--plug-ins/pagecurl/Makefile.am82
-rw-r--r--plug-ins/pagecurl/Makefile.in1033
-rw-r--r--plug-ins/pagecurl/curl0.pngbin0 -> 445 bytes
-rw-r--r--plug-ins/pagecurl/curl1.pngbin0 -> 487 bytes
-rw-r--r--plug-ins/pagecurl/curl2.pngbin0 -> 476 bytes
-rw-r--r--plug-ins/pagecurl/curl3.pngbin0 -> 450 bytes
-rw-r--r--plug-ins/pagecurl/curl4.pngbin0 -> 431 bytes
-rw-r--r--plug-ins/pagecurl/curl5.pngbin0 -> 474 bytes
-rw-r--r--plug-ins/pagecurl/curl6.pngbin0 -> 488 bytes
-rw-r--r--plug-ins/pagecurl/curl7.pngbin0 -> 448 bytes
-rw-r--r--plug-ins/pagecurl/pagecurl.c1028
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
+
+libgimpui = $(top_builddir)/libgimp/libgimpui-$(GIMP_API_VERSION).la
+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
+
+AM_LDFLAGS = $(mwindows)
+
+libexecdir = $(gimpplugindir)/plug-ins/pagecurl
+
+libexec_PROGRAMS = pagecurl
+
+pagecurl_SOURCES = pagecurl.c
+
+BUILT_SOURCES = pagecurl-icons.c
+
+AM_CPPFLAGS = \
+ -I$(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\">$$image</file>" >> $@; \
+ done; \
+ echo ' </gresource>' >> $@; \
+ echo '</gresources>' >> $@ )
+
+pagecurl-icons.c: pagecurl-icons.gresource.xml
+ $(AM_V_GEN) $(HOST_GLIB_COMPILE_RESOURCES) \
+ --sourcedir=$(srcdir) --generate-source \
+ --target=$@ pagecurl-icons.gresource.xml
diff --git a/plug-ins/pagecurl/Makefile.in b/plug-ins/pagecurl/Makefile.in
new file mode 100644
index 0000000..e259d57
--- /dev/null
+++ b/plug-ins/pagecurl/Makefile.in
@@ -0,0 +1,1033 @@
+# Makefile.in generated by automake 1.16.2 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+# Version resources for Microsoft Windows
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+ if test -z '$(MAKELEVEL)'; then \
+ false; \
+ elif test -n '$(MAKE_HOST)'; then \
+ true; \
+ elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+ true; \
+ else \
+ false; \
+ fi; \
+}
+am__make_running_with_option = \
+ case $${target_option-} in \
+ ?) ;; \
+ *) echo "am__make_running_with_option: internal error: invalid" \
+ "target option '$${target_option-}' specified" >&2; \
+ exit 1;; \
+ esac; \
+ has_opt=no; \
+ sane_makeflags=$$MAKEFLAGS; \
+ if $(am__is_gnu_make); then \
+ sane_makeflags=$$MFLAGS; \
+ else \
+ case $$MAKEFLAGS in \
+ *\\[\ \ ]*) \
+ bs=\\; \
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+ | sed "s/$$bs$$bs[$$bs $$bs ]*//g"`;; \
+ esac; \
+ fi; \
+ skip_next=no; \
+ strip_trailopt () \
+ { \
+ flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+ }; \
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+ test $$skip_next = yes && { skip_next=no; continue; }; \
+ case $$flg in \
+ *=*|--*) continue;; \
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+ -*l?*) strip_trailopt 'l';; \
+ -[dEDm]) skip_next=yes;; \
+ -[JT]) skip_next=yes;; \
+ esac; \
+ case $$flg in \
+ *$$target_option*) has_opt=yes; break;; \
+ esac; \
+ done; \
+ test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
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+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+libexec_PROGRAMS = pagecurl$(EXEEXT)
+subdir = plug-ins/pagecurl
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/m4macros/gtk-doc.m4 \
+ $(top_srcdir)/m4macros/intltool.m4 \
+ $(top_srcdir)/m4macros/libtool.m4 \
+ $(top_srcdir)/m4macros/ltoptions.m4 \
+ $(top_srcdir)/m4macros/ltsugar.m4 \
+ $(top_srcdir)/m4macros/ltversion.m4 \
+ $(top_srcdir)/m4macros/lt~obsolete.m4 \
+ $(top_srcdir)/acinclude.m4 $(top_srcdir)/m4macros/alsa.m4 \
+ $(top_srcdir)/m4macros/ax_compare_version.m4 \
+ $(top_srcdir)/m4macros/ax_cxx_compile_stdcxx.m4 \
+ $(top_srcdir)/m4macros/ax_gcc_func_attribute.m4 \
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+ $(top_srcdir)/m4macros/ax_prog_perl_version.m4 \
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+ $(top_srcdir)/m4macros/pythondev.m4 $(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+ $(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/config.h
+CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
+am__installdirs = "$(DESTDIR)$(libexecdir)"
+PROGRAMS = $(libexec_PROGRAMS)
+am_pagecurl_OBJECTS = pagecurl.$(OBJEXT)
+pagecurl_OBJECTS = $(am_pagecurl_OBJECTS)
+pagecurl_LDADD = $(LDADD)
+am__DEPENDENCIES_1 =
+pagecurl_DEPENDENCIES = $(am__DEPENDENCIES_1) $(libgimpui) \
+ $(libgimpwidgets) $(libgimpconfig) $(libgimp) $(libgimpcolor) \
+ $(libgimpmath) $(libgimpbase) $(am__DEPENDENCIES_1) \
+ $(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1) \
+ $(am__DEPENDENCIES_1) $(pagecurl_RC)
+AM_V_lt = $(am__v_lt_@AM_V@)
+am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
+am__v_lt_0 = --silent
+am__v_lt_1 =
+AM_V_P = $(am__v_P_@AM_V@)
+am__v_P_ = $(am__v_P_@AM_DEFAULT_V@)
+am__v_P_0 = false
+am__v_P_1 = :
+AM_V_GEN = $(am__v_GEN_@AM_V@)
+am__v_GEN_ = $(am__v_GEN_@AM_DEFAULT_V@)
+am__v_GEN_0 = @echo " GEN " $@;
+am__v_GEN_1 =
+AM_V_at = $(am__v_at_@AM_V@)
+am__v_at_ = $(am__v_at_@AM_DEFAULT_V@)
+am__v_at_0 = @
+am__v_at_1 =
+DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)
+depcomp = $(SHELL) $(top_srcdir)/depcomp
+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/pagecurl.Po
+am__mv = mv -f
+COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+ $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
+LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+ $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
+ $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+ $(AM_CFLAGS) $(CFLAGS)
+AM_V_CC = $(am__v_CC_@AM_V@)
+am__v_CC_ = $(am__v_CC_@AM_DEFAULT_V@)
+am__v_CC_0 = @echo " CC " $@;
+am__v_CC_1 =
+CCLD = $(CC)
+LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+ $(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+ $(AM_LDFLAGS) $(LDFLAGS) -o $@
+AM_V_CCLD = $(am__v_CCLD_@AM_V@)
+am__v_CCLD_ = $(am__v_CCLD_@AM_DEFAULT_V@)
+am__v_CCLD_0 = @echo " CCLD " $@;
+am__v_CCLD_1 =
+SOURCES = $(pagecurl_SOURCES)
+DIST_SOURCES = $(pagecurl_SOURCES)
+am__can_run_installinfo = \
+ case $$AM_UPDATE_INFO_DIR in \
+ n|no|NO) false;; \
+ *) (install-info --version) >/dev/null 2>&1;; \
+ esac
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+ BEGIN { nonempty = 0; } \
+ { items[$$0] = 1; nonempty = 1; } \
+ END { if (nonempty) { for (i in items) print i; }; } \
+'
+# Make sure the list of sources is unique. This is necessary because,
+# e.g., the same source file might be shared among _SOURCES variables
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+am__define_uniq_tagged_files = \
+ list='$(am__tagged_files)'; \
+ unique=`for i in $$list; do \
+ if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+ done | $(am__uniquify_input)`
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+CTAGS = ctags
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+ $(top_srcdir)/depcomp
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+
+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
Binary files differ
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
Binary files differ
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
Binary files differ
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
Binary files differ
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
Binary files differ
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
Binary files differ
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
Binary files differ
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
Binary files differ
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;
+}