LibGfx: Add Paths to themes

Paths allows themes to specify directories/files where custom
resources are located.

Libraries/LibGfx/Palette.cpp

@@ -67,6 +67,12 @@ int PaletteImpl::metric(MetricRole role) const
     return theme().metric[(int)role];
 }
 
+String PaletteImpl::path(PathRole role) const
+{
+    ASSERT((int)role < (int)PathRole::__Count);
+    return theme().path[(int)role];
+}
+
 NonnullRefPtr<PaletteImpl> PaletteImpl::clone() const
 {
     auto new_theme_buffer = SharedBuffer::create_with_size(m_theme_buffer->size());
@@ -90,6 +96,14 @@ void Palette::set_metric(MetricRole role, int value)
     theme.metric[(int)role] = value;
 }
 
+void Palette::set_path(PathRole role, String path)
+{
+    if (m_impl->ref_count() != 1)
+        m_impl = m_impl->clone();
+    auto& theme = const_cast<SystemTheme&>(impl().theme());
+    theme.path[(int)role] = path;
+}
+
 PaletteImpl::~PaletteImpl()
 {
 }

Libraries/LibGfx/Palette.h

@@ -45,6 +45,7 @@ public:
 
     Color color(ColorRole) const;
     int metric(MetricRole) const;
+    String path(PathRole) const;
     const SystemTheme& theme() const;
 
     void replace_internal_buffer(Badge<GUI::Application>, SharedBuffer& buffer);
@@ -124,11 +125,15 @@ public:
     int window_title_button_width() const { return metric(MetricRole::TitleButtonWidth); }
     int window_title_button_height() const { return metric(MetricRole::TitleButtonHeight); }
 
+    String title_button_icons_path() const { return path(PathRole::TitleButtonIcons); }
+
     Color color(ColorRole role) const { return m_impl->color(role); }
     int metric(MetricRole role) const { return m_impl->metric(role); }
+    String path(PathRole role) const { return m_impl->path(role); }
 
     void set_color(ColorRole, Color);
     void set_metric(MetricRole, int);
+    void set_path(PathRole, String);
 
     const SystemTheme& theme() const { return m_impl->theme(); }
 

Libraries/LibGfx/SystemTheme.cpp

@@ -85,6 +85,19 @@ RefPtr<SharedBuffer> load_system_theme(const String& path)
         return metric;
     };
 
+    auto get_path = [&](auto& name, auto role) {
+        auto path = file->read_entry("Paths", name);
+        if (path.is_empty()) {
+            switch (role) {
+            case (int)PathRole::TitleButtonIcons:
+                return "/res/icons/16x16/";
+            default:
+                return "/res/";
+            }
+        }
+        return &path[0];
+    };
+
 #define DO_COLOR(x) \
     data->color[(int)ColorRole::x] = get_color(#x)
 
@@ -153,6 +166,11 @@ RefPtr<SharedBuffer> load_system_theme(const String& path)
     DO_METRIC(TitleButtonWidth);
     DO_METRIC(TitleButtonHeight);
 
+#define DO_PATH(x) \
+    data->path[(int)PathRole::x] = get_path(#x, (int)PathRole::x)
+
+    DO_PATH(TitleButtonIcons);
+
     buffer->seal();
     buffer->share_globally();
 

Libraries/LibGfx/SystemTheme.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <AK/Forward.h>
+#include <AK/String.h>
 #include <AK/Types.h>
 #include <LibGfx/Color.h>
 
@@ -105,9 +106,16 @@ enum class MetricRole {
     __Count,
 };
 
+enum class PathRole {
+    NoRole,
+    TitleButtonIcons,
+    __Count,
+};
+
 struct SystemTheme {
     Color color[(int)ColorRole::__Count];
     int metric[(int)MetricRole::__Count];
+    String path[(int)PathRole::__Count];
 };
 
 const SystemTheme& current_system_theme();