Start working on a GUI kernel API.

1 files changed, 77 insertions, 0 deletions

diff --git a/Kernel/ProcessGUI.cpp b/Kernel/ProcessGUI.cpp
new file mode 100644
index 0000000000..7b19a550e1
--- /dev/null
+++ b/Kernel/ProcessGUI.cpp
@@ -0,0 +1,77 @@
+#include "Process.h"
+#include "MemoryManager.h"
+#include <LibC/errno_numbers.h>
+#include <Widgets/AbstractScreen.h>
+#include <Widgets/FrameBuffer.h>
+#include <Widgets/EventLoop.h>
+#include <Widgets/Font.h>
+#include <Widgets/Widget.h>
+#include <Widgets/Window.h>
+#include <Widgets/WindowManager.h>
+
+void Process::initialize_gui_statics()
+{
+    Font::initialize();
+    FrameBuffer::initialize();
+    EventLoop::initialize();
+    WindowManager::initialize();
+    AbstractScreen::initialize();
+
+    new EventLoop;
+}
+
+static void wait_for_gui_server()
+{
+    // FIXME: Time out after a while and return an error.
+    while (!EventLoop::main().running())
+        sleep(10);
+}
+
+int Process::gui$create_window(const GUI_CreateWindowParameters* user_params)
+{
+    wait_for_gui_server();
+
+    if (!validate_read_typed(user_params))
+        return -EFAULT;
+
+    GUI_CreateWindowParameters params = *user_params;
+    Rect rect { params.rect.x, params.rect.y, params.rect.width, params.rect.height };
+
+    if (rect.is_empty())
+        return -EINVAL;
+
+    ProcessPagingScope scope(EventLoop::main().server_process());
+
+    auto* window = new Window;
+    if (!window)
+        return -ENOMEM;
+
+    int window_id = m_windows.size();
+    m_windows.append(window);
+
+    window->setTitle(params.title);
+    window->setRect(rect);
+
+    auto* main_widget = new Widget;
+    window->setMainWidget(main_widget);
+    main_widget->setWindowRelativeRect({ 0, 0, rect.width(), rect.height() });
+    main_widget->setBackgroundColor(params.background_color);
+    main_widget->setFillWithBackgroundColor(true);
+    dbgprintf("%s<%u> gui$create_window: %d with rect {%d,%d %dx%d}\n", name().characters(), pid(), window_id, rect.x(), rect.y(), rect.width(), rect.height());
+
+    return window_id;
+}
+
+int Process::gui$destroy_window(int window_id)
+{
+    wait_for_gui_server();
+    dbgprintf("%s<%u> gui$destroy_window (window_id=%d)\n", name().characters(), pid(), window_id);
+    if (window_id < 0)
+        return -EINVAL;
+    if (window_id >= static_cast<int>(m_windows.size()))
+        return -EBADWIN;
+    auto* window = m_windows[window_id];
+    m_windows.remove(window_id);
+    window->deleteLater();
+    return 0;
+}