LibGUI: Support bitmaps in GTableView cells.

Use this to add an icon for each process in the ProcessManager.
Right now they all use a generic gear icon, but I'd like to have
per-process icons, obviously. :^)

4 files changed, 30 insertions, 13 deletions

diff --git a/Applications/ProcessManager/ProcessTableModel.cpp b/Applications/ProcessManager/ProcessTableModel.cpp
index 64fdb0f3b8..a5bd507abc 100644
--- a/Applications/ProcessManager/ProcessTableModel.cpp
+++ b/Applications/ProcessManager/ProcessTableModel.cpp
@@ -4,14 +4,15 @@
 #include <pwd.h>
 
 enum Column {
-    PID = 0,
+    Icon = 0,
+    Name,
+    CPU,
     State,
-    User,
     Priority,
+    User,
+    PID,
     Linear,
     Physical,
-    CPU,
-    Name,
     __Count
 };
 
@@ -21,6 +22,9 @@ ProcessTableModel::ProcessTableModel()
     while (auto* passwd = getpwent())
         m_usernames.set(passwd->pw_uid, passwd->pw_name);
     endpwent();
+
+    m_generic_process_icon = GraphicsBitmap::load_from_file(GraphicsBitmap::Format::RGBA32, "/res/icons/gear16.rgb", { 16, 16 });
+    ASSERT(m_generic_process_icon);
 }
 
 ProcessTableModel::~ProcessTableModel()
@@ -40,6 +44,7 @@ int ProcessTableModel::column_count() const
 String ProcessTableModel::column_name(int column) const
 {
     switch (column) {
+    case Column::Icon: return "";
     case Column::PID: return "PID";
     case Column::State: return "State";
     case Column::User: return "User";
@@ -55,14 +60,15 @@ String ProcessTableModel::column_name(int column) const
 GTableModel::ColumnMetadata ProcessTableModel::column_metadata(int column) const
 {
     switch (column) {
-    case Column::PID: return { 30, TextAlignment::CenterRight };
-    case Column::State: return { 80, TextAlignment::CenterLeft };
-    case Column::Priority: return { 75, TextAlignment::CenterLeft };
-    case Column::User: return { 60, TextAlignment::CenterLeft };
-    case Column::Linear: return { 70, TextAlignment::CenterRight };
-    case Column::Physical: return { 70, TextAlignment::CenterRight };
-    case Column::CPU: return { 30, TextAlignment::CenterRight };
-    case Column::Name: return { 200, TextAlignment::CenterLeft };
+    case Column::Icon: return { 16, TextAlignment::CenterLeft };
+    case Column::PID: return { 25, TextAlignment::CenterRight };
+    case Column::State: return { 75, TextAlignment::CenterLeft };
+    case Column::Priority: return { 65, TextAlignment::CenterLeft };
+    case Column::User: return { 50, TextAlignment::CenterLeft };
+    case Column::Linear: return { 65, TextAlignment::CenterRight };
+    case Column::Physical: return { 65, TextAlignment::CenterRight };
+    case Column::CPU: return { 25, TextAlignment::CenterRight };
+    case Column::Name: return { 140, TextAlignment::CenterLeft };
     default: ASSERT_NOT_REACHED();
     }
 }
@@ -93,6 +99,7 @@ GVariant ProcessTableModel::data(int row, int column) const
     auto it = m_processes.find(m_pids[row]);
     auto& process = *(*it).value;
     switch (column) {
+    case Column::Icon: return *m_generic_process_icon;
     case Column::PID: return process.current_state.pid;
     case Column::State: return process.current_state.state;
     case Column::User: return process.current_state.user;
diff --git a/Applications/ProcessManager/ProcessTableModel.h b/Applications/ProcessManager/ProcessTableModel.h
index 93ba789dfc..0246f521ed 100644
--- a/Applications/ProcessManager/ProcessTableModel.h
+++ b/Applications/ProcessManager/ProcessTableModel.h
@@ -44,4 +44,5 @@ private:
     HashMap<pid_t, OwnPtr<Process>> m_processes;
     Vector<pid_t> m_pids;
     int m_selected_row { -1 };
+    RetainPtr<GraphicsBitmap> m_generic_process_icon;
 };
diff --git a/LibGUI/GTableView.cpp b/LibGUI/GTableView.cpp
index df18c6bd83..d05b257745 100644
--- a/LibGUI/GTableView.cpp
+++ b/LibGUI/GTableView.cpp
@@ -121,7 +121,11 @@ void GTableView::paint_event(GPaintEvent& event)
             auto column_metadata = m_model->column_metadata(column_index);
             int column_width = column_metadata.preferred_width;
             Rect cell_rect(horizontal_padding() + x_offset, y, column_width, item_height());
-            painter.draw_text(cell_rect, m_model->data(row_index, column_index).to_string(), column_metadata.text_alignment, text_color);
+            auto data = m_model->data(row_index, column_index);
+            if (data.is_bitmap())
+                painter.blit(cell_rect.location(), data.as_bitmap(), data.as_bitmap().rect());
+            else
+                painter.draw_text(cell_rect, data.to_string(), column_metadata.text_alignment, text_color);
             x_offset += column_width + horizontal_padding() * 2;
         }
         ++painted_item_index;
diff --git a/LibGUI/GVariant.h b/LibGUI/GVariant.h
index c682d9d656..1dd6faef12 100644
--- a/LibGUI/GVariant.h
+++ b/LibGUI/GVariant.h
@@ -23,6 +23,11 @@ public:
     };
 
     bool is_valid() const { return m_type != Type::Invalid; }
+    bool is_bool() const { return m_type == Type::Bool; }
+    bool is_int() const { return m_type == Type::Int; }
+    bool is_float() const { return m_type == Type::Float; }
+    bool is_string() const { return m_type == Type::String; }
+    bool is_bitmap() const { return m_type == Type::Bitmap; }
     Type type() const { return m_type; }
 
     bool as_bool() const