BuildSystem: Cleanup userspace directory layout

userspace programs are now in userspace/programs
userspace tests are now in userspace/tests

This makes listing userspace projects much cleaner. Libraries were
already separated to their own directory, so other programs should also.

userspace/programs/WindowServer/Window.cpp

@@ -0,0 +1,72 @@
+#include "Window.h"
+
+#include <BAN/Debug.h>
+
+#include <LibGUI/Window.h>
+
+#include <sys/banan-os.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+Window::Window(int fd, Rectangle area, long smo_key, BAN::StringView title, const LibFont::Font& font)
+	: m_client_fd(fd)
+	, m_client_area(area)
+	, m_smo_key(smo_key)
+{
+	MUST(m_title.append(title));
+	prepare_title_bar(font);
+
+	m_fb_addr = static_cast<uint32_t*>(smo_map(smo_key));
+	ASSERT(m_fb_addr);
+	memset(m_fb_addr, 0, client_width() * client_height() * 4);
+}
+
+Window::~Window()
+{
+	munmap(m_fb_addr, client_width() * client_height() * 4);
+	smo_delete(m_smo_key);
+
+	LibGUI::EventPacket event;
+	event.type = LibGUI::EventPacket::Type::DestroyWindow;
+	send(m_client_fd, &event, sizeof(event), 0);
+	close(m_client_fd);
+}
+
+void Window::prepare_title_bar(const LibFont::Font& font)
+{
+	const size_t title_bar_bytes = title_bar_width() * title_bar_height() * 4;
+	uint32_t* title_bar_data = new uint32_t[title_bar_bytes];
+	ASSERT(title_bar_data);
+	for (size_t i = 0; i < title_bar_bytes; i++)
+		title_bar_data[i] = 0xFFFFFF;
+
+	const auto text_area = title_text_area();
+
+	for (size_t i = 0; i < m_title.size() && (i + 1) * font.width() < static_cast<uint32_t>(text_area.width); i++)
+	{
+		const auto* glyph = font.glyph(m_title[i]);
+		if (glyph == nullptr)
+			continue;
+
+		const int32_t y_off = (font.height() < (uint32_t)title_bar_height()) ? (title_bar_height() - font.height()) / 2 : 0;
+		const int32_t x_off = y_off + i * font.width();
+		for (int32_t y = 0; (uint32_t)y < font.height(); y++)
+		{
+			if (y + y_off >= title_bar_height())
+				break;
+			for (int32_t x = 0; (uint32_t)x < font.width(); x++)
+			{
+				if (x + x_off >= text_area.width)
+					break;
+				const uint8_t bitmask = 1 << (font.width() - x - 1);
+				if (glyph[y * font.pitch()] & bitmask)
+					title_bar_data[(y_off + y) * title_bar_width() + (x_off + x)] = 0x000000;
+			}
+		}
+	}
+
+	if (m_title_bar_data)
+		delete[] m_title_bar_data;
+	m_title_bar_data = title_bar_data;
+}