[gthumb/ext] [file tools] added the "invert colors" tool

[Paolo Bacchilega <paobac src gnome org>]

commit be50bf57c8d7bdda24f08ec32fd13c11070c113e
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Sep 20 19:45:10 2009 +0200

    [file tools] added the "invert colors" tool

 extensions/file_tools/Makefile.am              |    2 +
 extensions/file_tools/gth-file-tool-negative.c |  134 ++++++++++++++++++++++++
 extensions/file_tools/gth-file-tool-negative.h |   52 +++++++++
 extensions/file_tools/main.c                   |    2 +
 4 files changed, 190 insertions(+), 0 deletions(-)
---
diff --git a/extensions/file_tools/Makefile.am b/extensions/file_tools/Makefile.am
index 4b2a25e..376ef2e 100644
--- a/extensions/file_tools/Makefile.am
+++ b/extensions/file_tools/Makefile.am
@@ -14,6 +14,8 @@ libfile_tools_la_SOURCES = 		\
 	gth-file-tool-enhance.h		\
 	gth-file-tool-equalize.c	\
 	gth-file-tool-equalize.h	\
+	gth-file-tool-negative.c	\
+	gth-file-tool-negative.h	\
 	gth-file-tool-redo.c		\
 	gth-file-tool-redo.h		\
 	gth-file-tool-save.c		\
diff --git a/extensions/file_tools/gth-file-tool-negative.c b/extensions/file_tools/gth-file-tool-negative.c
new file mode 100644
index 0000000..85f6888
--- /dev/null
+++ b/extensions/file_tools/gth-file-tool-negative.c
@@ -0,0 +1,134 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+
+/*
+ *  GThumb
+ *
+ *  Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
+ */
+
+#include <config.h>
+#include <gthumb.h>
+#include <extensions/image_viewer/gth-image-viewer-page.h>
+#include "gth-file-tool-negative.h"
+
+
+static void
+gth_file_tool_negative_update_sensitivity (GthFileTool *base)
+{
+	GtkWidget *window;
+	GtkWidget *viewer_page;
+
+	window = gth_file_tool_get_window (base);
+	viewer_page = gth_browser_get_viewer_page (GTH_BROWSER (window));
+	if (! GTH_IS_IMAGE_VIEWER_PAGE (viewer_page))
+		gtk_widget_set_sensitive (GTK_WIDGET (base), FALSE);
+	else
+		gtk_widget_set_sensitive (GTK_WIDGET (base), TRUE);
+}
+
+
+static void
+negative_step (GthPixbufTask *pixop)
+{
+	pixop->dest_pixel[RED_PIX]   = 255 - pixop->dest_pixel[RED_PIX];
+	pixop->dest_pixel[GREEN_PIX] = 255 - pixop->dest_pixel[GREEN_PIX];
+	pixop->dest_pixel[BLUE_PIX]  = 255 - pixop->dest_pixel[BLUE_PIX];
+
+	if (pixop->has_alpha)
+		pixop->dest_pixel[ALPHA_PIX] = pixop->src_pixel[ALPHA_PIX];
+}
+
+
+static void
+negative_release (GthPixbufTask *pixop,
+		    GError        *error)
+{
+	if (error == NULL)
+		gth_image_viewer_page_set_pixbuf (GTH_IMAGE_VIEWER_PAGE (pixop->data), pixop->dest, TRUE);
+}
+
+
+static void
+gth_file_tool_negative_activate (GthFileTool *base)
+{
+	GtkWidget *window;
+	GtkWidget *viewer_page;
+	GtkWidget *viewer;
+	GdkPixbuf *src_pixbuf;
+	GdkPixbuf *dest_pixbuf;
+	GthTask   *task;
+
+	window = gth_file_tool_get_window (base);
+	viewer_page = gth_browser_get_viewer_page (GTH_BROWSER (window));
+	if (! GTH_IS_IMAGE_VIEWER_PAGE (viewer_page))
+		return;
+
+	viewer = gth_image_viewer_page_get_image_viewer (GTH_IMAGE_VIEWER_PAGE (viewer_page));
+	src_pixbuf = gth_image_viewer_get_current_pixbuf (GTH_IMAGE_VIEWER (viewer));
+	if (src_pixbuf == NULL)
+		return;
+
+	dest_pixbuf = gdk_pixbuf_copy (src_pixbuf);
+	task = gth_pixbuf_task_new (_("Applying changes"),
+				    src_pixbuf,
+				    dest_pixbuf,
+				    NULL,
+				    negative_step,
+				    negative_release,
+				    viewer_page);
+	gth_browser_exec_task (GTH_BROWSER (window), task, FALSE);
+
+	g_object_unref (task);
+	g_object_unref (dest_pixbuf);
+}
+
+
+static void
+gth_file_tool_negative_instance_init (GthFileToolNegative *self)
+{
+	gth_file_tool_construct (GTH_FILE_TOOL (self), GTK_STOCK_EDIT, _("Negative"), _("Negative"), FALSE);
+}
+
+
+static void
+gth_file_tool_negative_class_init (GthFileToolClass *klass)
+{
+	klass->update_sensitivity = gth_file_tool_negative_update_sensitivity;
+	klass->activate = gth_file_tool_negative_activate;
+}
+
+
+GType
+gth_file_tool_negative_get_type (void) {
+	static GType type_id = 0;
+	if (type_id == 0) {
+		static const GTypeInfo g_define_type_info = {
+			sizeof (GthFileToolNegativeClass),
+			(GBaseInitFunc) NULL,
+			(GBaseFinalizeFunc) NULL,
+			(GClassInitFunc) gth_file_tool_negative_class_init,
+			(GClassFinalizeFunc) NULL,
+			NULL,
+			sizeof (GthFileToolNegative),
+			0,
+			(GInstanceInitFunc) gth_file_tool_negative_instance_init,
+			NULL
+		};
+		type_id = g_type_register_static (GTH_TYPE_FILE_TOOL, "GthFileToolNegative", &g_define_type_info, 0);
+	}
+	return type_id;
+}
diff --git a/extensions/file_tools/gth-file-tool-negative.h b/extensions/file_tools/gth-file-tool-negative.h
new file mode 100644
index 0000000..d5816ae
--- /dev/null
+++ b/extensions/file_tools/gth-file-tool-negative.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+
+/*
+ *  GThumb
+ *
+ *  Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef GTH_FILE_TOOL_NEGATIVE_H
+#define GTH_FILE_TOOL_NEGATIVE_H
+
+#include <gthumb.h>
+
+G_BEGIN_DECLS
+
+#define GTH_TYPE_FILE_TOOL_NEGATIVE (gth_file_tool_negative_get_type ())
+#define GTH_FILE_TOOL_NEGATIVE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GTH_TYPE_FILE_TOOL_NEGATIVE, GthFileToolNegative))
+#define GTH_FILE_TOOL_NEGATIVE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GTH_TYPE_FILE_TOOL_NEGATIVE, GthFileToolNegativeClass))
+#define GTH_IS_FILE_TOOL_NEGATIVE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GTH_TYPE_FILE_TOOL_NEGATIVE))
+#define GTH_IS_FILE_TOOL_NEGATIVE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GTH_TYPE_FILE_TOOL_NEGATIVE))
+#define GTH_FILE_TOOL_NEGATIVE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GTH_TYPE_FILE_TOOL_NEGATIVE, GthFileToolNegativeClass))
+
+typedef struct _GthFileToolNegative GthFileToolNegative;
+typedef struct _GthFileToolNegativeClass GthFileToolNegativeClass;
+
+struct _GthFileToolNegative {
+	GthFileTool parent_instance;
+};
+
+struct _GthFileToolNegativeClass {
+	GthFileToolClass parent_class;
+};
+
+GType  gth_file_tool_negative_get_type  (void);
+
+G_END_DECLS
+
+#endif /* GTH_FILE_TOOL_NEGATIVE_H */
diff --git a/extensions/file_tools/main.c b/extensions/file_tools/main.c
index a32f69c..351b6eb 100644
--- a/extensions/file_tools/main.c
+++ b/extensions/file_tools/main.c
@@ -29,6 +29,7 @@
 #include "gth-file-tool-desaturate.h"
 #include "gth-file-tool-enhance.h"
 #include "gth-file-tool-equalize.h"
+#include "gth-file-tool-negative.h"
 #include "gth-file-tool-redo.h"
 #include "gth-file-tool-save.h"
 #include "gth-file-tool-save-as.h"
@@ -46,6 +47,7 @@ gthumb_extension_activate (void)
 	gth_main_register_type ("file-tools", GTH_TYPE_FILE_TOOL_ADJUST_COLORS);
 	gth_main_register_type ("file-tools", GTH_TYPE_FILE_TOOL_EQUALIZE);
 	gth_main_register_type ("file-tools", GTH_TYPE_FILE_TOOL_DESATURATE);
+	gth_main_register_type ("file-tools", GTH_TYPE_FILE_TOOL_NEGATIVE);
 	gth_main_register_type ("file-tools", GTH_TYPE_FILE_TOOL_CROP);
 }