1 files changed, 77 insertions, 0 deletions
diff --git a/src/extension/internal/bitmap/channel.cpp b/src/extension/internal/bitmap/channel.cpp
new file mode 100644
index 0000000..38ba8f1
--- /dev/null
+++ b/src/extension/internal/bitmap/channel.cpp
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2007 Authors:
+ *   Christopher Brown <audiere@gmail.com>
+ *   Ted Gould <ted@gould.cx>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "extension/effect.h"
+#include "extension/system.h"
+
+#include "channel.h"
+#include <Magick++.h>
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+namespace Bitmap {
+	
+void
+Channel::applyEffect(Magick::Image *image) {	
+	Magick::ChannelType layer = Magick::UndefinedChannel;
+	if (!strcmp(_layerName,      "Red Channel"))		layer = Magick::RedChannel;
+	else if (!strcmp(_layerName, "Green Channel"))		layer = Magick::GreenChannel;
+	else if (!strcmp(_layerName, "Blue Channel"))		layer = Magick::BlueChannel;
+	else if (!strcmp(_layerName, "Cyan Channel"))		layer = Magick::CyanChannel;
+	else if (!strcmp(_layerName, "Magenta Channel"))	layer = Magick::MagentaChannel;
+	else if (!strcmp(_layerName, "Yellow Channel"))		layer = Magick::YellowChannel;
+	else if (!strcmp(_layerName, "Black Channel"))		layer = Magick::BlackChannel;
+	else if (!strcmp(_layerName, "Opacity Channel"))	layer = Magick::OpacityChannel;
+	else if (!strcmp(_layerName, "Matte Channel"))		layer = Magick::MatteChannel;		
+	
+	image->channel(layer);
+}
+
+void
+Channel::refreshParameters(Inkscape::Extension::Effect *module) {	
+	_layerName = module->get_param_optiongroup("layer");
+}
+
+#include "../clear-n_.h"
+
+void
+Channel::init()
+{
+    // clang-format off
+    Inkscape::Extension::build_from_mem(
+        "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
+            "<name>" N_("Channel") "</name>\n"
+            "<id>org.inkscape.effect.bitmap.channel</id>\n"
+            "<param name=\"layer\" gui-text=\"" N_("Layer:") "\" type=\"optiongroup\" appearance=\"combo\" >\n"
+                "<option value='Red Channel'>" N_("Red Channel") "</option>\n"
+                "<option value='Green Channel'>" N_("Green Channel") "</option>\n"
+                "<option value='Blue Channel'>" N_("Blue Channel") "</option>\n"
+                "<option value='Cyan Channel'>" N_("Cyan Channel") "</option>\n"
+                "<option value='Magenta Channel'>" N_("Magenta Channel") "</option>\n"
+                "<option value='Yellow Channel'>" N_("Yellow Channel") "</option>\n"
+                "<option value='Black Channel'>" N_("Black Channel") "</option>\n"
+                "<option value='Opacity Channel'>" N_("Opacity Channel") "</option>\n"
+                "<option value='Matte Channel'>" N_("Matte Channel") "</option>\n"
+            "</param>\n"
+            "<effect>\n"
+                "<object-type>all</object-type>\n"
+                "<effects-menu>\n"
+                    "<submenu name=\"" N_("Raster") "\" />\n"
+                "</effects-menu>\n"
+                "<menu-tip>" N_("Extract specific channel from image") "</menu-tip>\n"
+            "</effect>\n"
+        "</inkscape-extension>\n", new Channel());
+    // clang-format on
+}
+
+}; /* namespace Bitmap */
+}; /* namespace Internal */
+}; /* namespace Extension */
+}; /* namespace Inkscape */