LibGfx: Add TintFilter

This is a very simpler filter that tints an image with a color.

Userland/Libraries/LibGfx/Filters/TintFilter.h

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/StringView.h>
+#include <LibGfx/Filters/ColorFilter.h>
+
+namespace Gfx {
+
+class TintFilter : public ColorFilter {
+public:
+    TintFilter(Color color, float amount)
+        : ColorFilter(amount)
+        , m_color(color)
+    {
+    }
+
+    virtual StringView class_name() const override { return "TintFilter"sv; }
+
+protected:
+    Color convert_color(Color) override
+    {
+        // Note: ColorFilter will blend by amount
+        return m_color;
+    };
+
+private:
+    Gfx::Color m_color;
+};
+
+}