LibGUI+LibGfx+WindowServer: Auto-generate disabled action icons :^)

This patch adds a simple filter that makes button and menu item icons
have that "'90s disabled" look when disabled. It's pretty awesome.

2 files changed, 17 insertions, 0 deletions

diff --git a/Libraries/LibGfx/Painter.cpp b/Libraries/LibGfx/Painter.cpp
index 38655da1ec..63015774ad 100644
--- a/Libraries/LibGfx/Painter.cpp
+++ b/Libraries/LibGfx/Painter.cpp
@@ -37,6 +37,7 @@
 #include <AK/Utf32View.h>
 #include <AK/Utf8View.h>
 #include <LibGfx/CharacterBitmap.h>
+#include <LibGfx/Palette.h>
 #include <LibGfx/Path.h>
 #include <math.h>
 #include <stdio.h>
@@ -1612,4 +1613,19 @@ void Painter::fill_path(Path& path, Color color, WindingRule winding_rule)
 #endif
 }
 
+void Painter::blit_disabled(const IntPoint& location, const Gfx::Bitmap& bitmap, const IntRect& rect, const Palette& palette)
+{
+    auto bright_color = palette.threed_highlight();
+    auto dark_color = palette.threed_shadow1();
+    blit_filtered(location.translated(1, 1), bitmap, rect, [&](auto) {
+        return bright_color;
+    });
+    blit_filtered(location, bitmap, rect, [&](Color src) {
+        int gray = src.to_grayscale().red();
+        if (gray > 160)
+            return bright_color;
+        return dark_color;
+    });
+}
+
 }
diff --git a/Libraries/LibGfx/Painter.h b/Libraries/LibGfx/Painter.h
index d2b71cb74a..8ae33fc207 100644
--- a/Libraries/LibGfx/Painter.h
+++ b/Libraries/LibGfx/Painter.h
@@ -76,6 +76,7 @@ public:
     void draw_tiled_bitmap(const IntRect& dst_rect, const Gfx::Bitmap&);
     void blit_offset(const IntPoint&, const Gfx::Bitmap&, const IntRect& src_rect, const IntPoint&);
     void blit_scaled(const IntRect&, const Gfx::Bitmap&, const IntRect&, float, float);
+    void blit_disabled(const IntPoint&, const Gfx::Bitmap&, const IntRect&, const Palette&);
     void draw_text(const IntRect&, const StringView&, const Font&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
     void draw_text(const IntRect&, const StringView&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);
     void draw_text(const IntRect&, const Utf32View&, const Font&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None);