1 files changed, 57 insertions, 0 deletions
diff --git a/src/extension/internal/bitmap/opacity.cpp b/src/extension/internal/bitmap/opacity.cpp
new file mode 100644
index 0000000..024dcb9
--- /dev/null
+++ b/src/extension/internal/bitmap/opacity.cpp
@@ -0,0 +1,57 @@
+// 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 "opacity.h"
+#include <Magick++.h>
+
+namespace Inkscape {
+namespace Extension {
+namespace Internal {
+namespace Bitmap {
+	
+void
+Opacity::applyEffect(Magick::Image* image) {
+	Magick::Quantum opacity = Magick::Color::scaleDoubleToQuantum((100 - _opacity) / 100.0);
+	image->opacity(opacity);
+}
+
+void
+Opacity::refreshParameters(Inkscape::Extension::Effect* module) {
+	_opacity = module->get_param_float("opacity");
+}
+
+#include "../clear-n_.h"
+
+void
+Opacity::init()
+{
+    // clang-format off
+    Inkscape::Extension::build_from_mem(
+        "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
+            "<name>" N_("Opacity") "</name>\n"
+            "<id>org.inkscape.effect.bitmap.opacity</id>\n"
+            "<param name=\"opacity\" gui-text=\"" N_("Opacity:") "\" type=\"float\" min=\"0.0\" max=\"100.0\">80.0</param>\n"
+            "<effect>\n"
+                "<object-type>all</object-type>\n"
+                "<effects-menu>\n"
+                    "<submenu name=\"" N_("Raster") "\" />\n"
+                "</effects-menu>\n"
+                "<menu-tip>" N_("Modify opacity channel(s) of selected bitmap(s)") "</menu-tip>\n"
+            "</effect>\n"
+        "</inkscape-extension>\n", new Opacity());
+    // clang-format on
+}
+
+}; /* namespace Bitmap */
+}; /* namespace Internal */
+}; /* namespace Extension */
+}; /* namespace Inkscape */