userspace: Add missing alpha channels

This was an awesome idea by [@Dcraftbg](https://github.com/Dcraftbg)

ports/doom/patches/0001-Add-support-for-banan-os.patch

@@ -168,7 +168,7 @@ index 0000000..9161771
 +{
 +	for (size_t y = 0; y < DOOMGENERIC_RESY; y++)
 +		for (size_t x = 0; x < DOOMGENERIC_RESX; x++)
-+			s_window->set_pixel(x, y, DG_ScreenBuffer[y * DOOMGENERIC_RESX + x]);
++			s_window->set_pixel(x, y, 0xFF000000 | DG_ScreenBuffer[y * DOOMGENERIC_RESX + x]);
 +	s_window->invalidate();
 +	s_window->poll_events();
 +}

userspace/libraries/LibGUI/Window.cpp

@@ -28,7 +28,7 @@ namespace LibGUI
 			return BAN::Error::from_errno(EINVAL);
 
 		BAN::Vector<uint32_t> framebuffer;
-		TRY(framebuffer.resize(width * height));
+		TRY(framebuffer.resize(width * height, 0xFF000000));
 
 		int server_fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
 		if (server_fd == -1)

userspace/programs/Terminal/Terminal.cpp

@@ -9,6 +9,28 @@
 #include <sys/select.h>
 #include <unistd.h>
 
+static constexpr uint32_t s_colors_dark[] {
+	0xCC'000000,
+	0xCC'FF0000,
+	0xCC'00FF00,
+	0xCC'FFFF00,
+	0xCC'0000FF,
+	0xCC'FF00FF,
+	0xCC'00FFFF,
+	0xCC'BFBFBF,
+};
+
+static constexpr uint32_t s_colors_bright[] {
+	0xCC'3F3F3F,
+	0xCC'FF7F7F,
+	0xCC'7FFF7F,
+	0xCC'FFFF7F,
+	0xCC'7F7FFF,
+	0xCC'FF7FFF,
+	0xCC'7FFFFF,
+	0xCC'FFFFFF,
+};
+
 void Terminal::start_shell()
 {
 	int pts_master = posix_openpt(O_RDWR | O_NOCTTY);
@@ -85,6 +107,9 @@ void Terminal::run()
 	signal(SIGCHLD, [](int) { s_shell_exited = true; });
 	start_shell();
 
+	m_bg_color = s_colors_dark[0];
+	m_fg_color = s_colors_bright[7];
+
 	m_window = MUST(LibGUI::Window::create(600, 400, "Terminal"_sv));
 	m_window->fill(m_bg_color);
 	m_window->invalidate();
@@ -184,45 +209,23 @@ bool Terminal::read_shell()
 
 void Terminal::handle_sgr()
 {
-	constexpr uint32_t colors_dark[] {
-		0xFF'000000,
-		0xFF'FF0000,
-		0xFF'00FF00,
-		0xFF'FFFF00,
-		0xFF'0000FF,
-		0xFF'FF00FF,
-		0xFF'00FFFF,
-		0xFF'BFBFBF,
-	};
-
-	constexpr uint32_t colors_bright[] {
-		0xFF'3F3F3F,
-		0xFF'FF7F7F,
-		0xFF'7FFF7F,
-		0xFF'FFFF7F,
-		0xFF'7F7FFF,
-		0xFF'FF7FFF,
-		0xFF'7FFFFF,
-		0xFF'FFFFFF,
-	};
-
 	switch (m_csi_info.fields[0])
 	{
 		case -1: case 0:
-			m_fg_color = 0xFFFFFF;
-			m_bg_color = 0x000000;
+			m_bg_color = s_colors_dark[0];
+			m_fg_color = s_colors_bright[7];
 			break;
 		case 30: case 31: case 32: case 33: case 34: case 35: case 36: case 37:
-			m_fg_color = colors_dark[m_csi_info.fields[0] - 30];
+			m_fg_color = s_colors_dark[m_csi_info.fields[0] - 30];
 			break;
 		case 40: case 41: case 42: case 43: case 44: case 45: case 46: case 47:
-			m_bg_color = colors_dark[m_csi_info.fields[0] - 40];
+			m_bg_color = s_colors_dark[m_csi_info.fields[0] - 40];
 			break;
 		case 90: case 91: case 92: case 93: case 94: case 95: case 96: case 97:
-			m_fg_color = colors_bright[m_csi_info.fields[0] - 90];
+			m_fg_color = s_colors_bright[m_csi_info.fields[0] - 90];
 			break;
 		case 100: case 101: case 102: case 103: case 104: case 105: case 106: case 107:
-			m_bg_color = colors_bright[m_csi_info.fields[0] - 100];
+			m_bg_color = s_colors_bright[m_csi_info.fields[0] - 100];
 			break;
 		default:
 			dprintln("TODO: SGR {}", m_csi_info.fields[0]);

userspace/programs/Terminal/Terminal.h

@@ -70,6 +70,6 @@ private:
 	uint8_t m_utf8_bytes[4] { };
 
 	Cursor m_saved_cursor { 0, 0 };
-	uint32_t m_fg_color { 0xFFFFFF };
-	uint32_t m_bg_color { 0x000000 };
+	uint32_t m_fg_color { 0 };
+	uint32_t m_bg_color { 0 };
 };

userspace/programs/WindowServer/Window.cpp

@@ -39,7 +39,7 @@ void Window::prepare_title_bar(const LibFont::Font& font)
 	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;
+		title_bar_data[i] = 0xFFFFFFFF;
 
 	const auto text_area = title_text_area();
 
@@ -61,7 +61,7 @@ void Window::prepare_title_bar(const LibFont::Font& font)
 					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;
+					title_bar_data[(y_off + y) * title_bar_width() + (x_off + x)] = 0xFF000000;
 			}
 		}
 	}

userspace/programs/WindowServer/Window.h

@@ -49,7 +49,7 @@ public:
 		ASSERT(title_bar_area().contains({ abs_x, abs_y }));
 
 		if (auto close_button = close_button_area(); close_button.contains({ abs_x, abs_y }))
-			return close_button.contains(cursor) ? 0xFF0000 : 0xD00000;
+			return close_button.contains(cursor) ? 0xFFFF0000 : 0xFFD00000;
 
 		int32_t rel_x = abs_x - title_bar_x();
 		int32_t rel_y = abs_y - title_bar_y();

userspace/programs/WindowServer/WindowServer.cpp

@@ -13,8 +13,9 @@
 
 #include <unistd.h>
 
-WindowServer::WindowServer(Framebuffer& framebuffer)
+WindowServer::WindowServer(Framebuffer& framebuffer, int32_t corner_radius)
 	: m_framebuffer(framebuffer)
+	, m_corner_radius(corner_radius)
 	, m_cursor({ framebuffer.width / 2, framebuffer.height / 2 })
 	, m_font(MUST(LibFont::Font::load("/usr/share/fonts/lat0-16.psfu"_sv)))
 {
@@ -166,6 +167,10 @@ void WindowServer::on_key_event(LibInput::KeyEvent event)
 		return;
 	}
 
+	// Toggle window bounce with F2
+	if (event.pressed() && event.key == LibInput::Key::F2)
+		m_is_bouncing_window = !m_is_bouncing_window;
+
 	if (m_focused_window)
 	{
 		LibGUI::EventPacket packet;
@@ -297,6 +302,21 @@ void WindowServer::set_focused_window(BAN::RefPtr<Window> window)
 	}
 }
 
+static uint32_t alpha_blend(uint32_t color_a, uint32_t color_b)
+{
+	const uint32_t a_a =   color_a >> 24;
+	const uint32_t a_b = ((color_b >> 24) * (256 - a_a)) >> 8;
+	const uint32_t a = a_a + a_b;
+
+	const uint32_t rb1 = (a_a * (color_a & 0xFF00FF)) >> 8;
+	const uint32_t rb2 = (a_b * (color_b & 0xFF00FF)) >> 8;
+
+	const uint32_t g1  = (a_a * (color_a & 0x00FF00)) >> 8;
+	const uint32_t g2  = (a_b * (color_b & 0x00FF00)) >> 8;
+
+	return (a << 24) | ((rb1 | rb2) & 0xFF00FF) | ((g1 | g2) & 0x00FF00);
+}
+
 void WindowServer::invalidate(Rectangle area)
 {
 	auto fb_overlap = area.get_overlap(m_framebuffer.area());
@@ -315,42 +335,170 @@ void WindowServer::invalidate(Rectangle area)
 	else
 	{
 		for (int32_t y = area.y; y < area.y + area.height; y++)
-			memset(&m_framebuffer.mmap[y * m_framebuffer.width + area.x], 0x10, area.width * 4);
+			for (int32_t x = area.x; x < area.x + area.width; x++)
+				m_framebuffer.mmap[y * m_framebuffer.width + x] = 0xFF101010;
 	}
 
 	for (auto& pwindow : m_client_windows)
 	{
 		auto& window = *pwindow;
 
+		const Rectangle fast_areas[] {
+			{
+				window.full_x() + m_corner_radius,
+				window.full_y(),
+				window.full_width() - 2 * m_corner_radius,
+				m_corner_radius
+			},
+			{
+				window.full_x(),
+				window.full_y() + m_corner_radius,
+				window.full_width(),
+				window.full_height() - 2 * m_corner_radius
+			},
+			{
+				window.full_x() + m_corner_radius,
+				window.full_y() + window.full_height() - m_corner_radius,
+				window.full_width() - 2 * m_corner_radius,
+				m_corner_radius
+			}
+		};
+
+		const Position corner_centers[] {
+			{
+				window.full_x()                              + m_corner_radius,
+				window.full_y()                              + m_corner_radius,
+			},
+			{
+				window.full_x() + (window.full_width() - 1)  - m_corner_radius,
+				window.full_y()                              + m_corner_radius,
+			},
+			{
+				window.full_x()                              + m_corner_radius,
+				window.full_y() + (window.full_height() - 1) - m_corner_radius,
+			},
+			{
+				window.full_x() + (window.full_width()  - 1) - m_corner_radius,
+				window.full_y() + (window.full_height() - 1) - m_corner_radius,
+			},
+		};
+
+		const Rectangle corner_areas[] {
+			{
+				window.full_x(),
+				window.full_y(),
+				m_corner_radius,
+				m_corner_radius
+			},
+			{
+				window.full_x() + window.full_width() - m_corner_radius,
+				window.full_y(),
+				m_corner_radius,
+				m_corner_radius
+			},
+			{
+				window.full_x(),
+				window.full_y() + window.full_height() - m_corner_radius,
+				m_corner_radius,
+				m_corner_radius
+			},
+			{
+				window.full_x() + window.full_width() - m_corner_radius,
+				window.full_y() + window.full_height() - m_corner_radius,
+				m_corner_radius,
+				m_corner_radius
+			}
+		};
+
+		const auto is_rounded_off =
+			[&](Position pos) -> bool
+			{
+				for (size_t i = 0; i < 4; i++)
+				{
+					if (!corner_areas[i].contains(pos))
+						continue;
+					const int32_t dx = pos.x - corner_centers[i].x;
+					const int32_t dy = pos.y - corner_centers[i].y;
+					if (2 * (dy > 0) + (dx > 0) != i)
+						continue;
+					if (dx * dx + dy * dy >= m_corner_radius * m_corner_radius)
+						return true;
+				}
+				return false;
+			};
+
 		// window title bar
-		if (auto overlap = window.title_bar_area().get_overlap(area); overlap.has_value())
+		if (auto title_overlap = window.title_bar_area().get_overlap(area); title_overlap.has_value())
 		{
-			for (int32_t y_off = 0; y_off < overlap->height; y_off++)
+			for (int32_t y_off = 0; y_off < title_overlap->height; y_off++)
 			{
-				for (int32_t x_off = 0; x_off < overlap->width; x_off++)
+				for (int32_t x_off = 0; x_off < title_overlap->width; x_off++)
 				{
-					uint32_t pixel = window.title_bar_pixel(
-						overlap->x + x_off,
-						overlap->y + y_off,
-						m_cursor
-					);
-					m_framebuffer.mmap[(overlap->y + y_off) * m_framebuffer.width + overlap->x + x_off] = pixel;
+					const int32_t abs_x = title_overlap->x + x_off;
+					const int32_t abs_y = title_overlap->y + y_off;
+					if (is_rounded_off({ abs_x, abs_y }))
+						continue;
+
+					const uint32_t color = window.title_bar_pixel(abs_x, abs_y, m_cursor);
+					m_framebuffer.mmap[abs_y * m_framebuffer.width + abs_x] = color;
 				}
 			}
 		}
 
 		// window client area
-		if (auto overlap = window.client_area().get_overlap(area); overlap.has_value())
+		if (auto client_overlap = window.client_area().get_overlap(area); client_overlap.has_value())
 		{
-			const int32_t src_x = overlap->x - window.client_x();
-			const int32_t src_y = overlap->y - window.client_y();
-			for (int32_t y_off = 0; y_off < overlap->height; y_off++)
+			for (const auto& fast_area : fast_areas)
 			{
-				memcpy(
-					&m_framebuffer.mmap[(overlap->y + y_off) * m_framebuffer.width + overlap->x],
-					&window.framebuffer()[(src_y + y_off) * window.client_width() + src_x],
-					overlap->width * 4
-				);
+				auto fast_overlap = client_overlap->get_overlap(fast_area);
+				if (!fast_overlap.has_value())
+					continue;
+				for (int32_t y_off = 0; y_off < fast_overlap->height; y_off++)
+				{
+					const int32_t abs_row_y = fast_overlap->y + y_off;
+					const int32_t abs_row_x = fast_overlap->x;
+
+					const int32_t src_row_y = abs_row_y - window.client_y();
+					const int32_t src_row_x = abs_row_x - window.client_x();
+
+					auto* window_row = &window.framebuffer()[src_row_y * window.client_width() + src_row_x];
+					auto* frameb_row = &m_framebuffer.mmap[  abs_row_y * m_framebuffer.width   + abs_row_x];
+
+					for (int32_t i = 0; i < fast_overlap->width; i++)
+					{
+						const uint32_t color_a = *window_row;
+						const uint32_t color_b = *frameb_row;
+						*frameb_row = alpha_blend(color_a, color_b);
+
+						window_row++;
+						frameb_row++;
+					}
+				}
+			}
+
+			for (const auto& corner_area : corner_areas)
+			{
+				auto corner_overlap = client_overlap->get_overlap(corner_area);
+				if (!corner_overlap.has_value())
+					continue;
+				for (int32_t y_off = 0; y_off < corner_overlap->height; y_off++)
+				{
+					for (int32_t x_off = 0; x_off < corner_overlap->width; x_off++)
+					{
+						const int32_t abs_x = corner_overlap->x + x_off;
+						const int32_t abs_y = corner_overlap->y + y_off;
+						if (is_rounded_off({ abs_x, abs_y }))
+							continue;
+
+						const int32_t src_x = abs_x - window.client_x();
+						const int32_t src_y = abs_y - window.client_y();
+
+						const uint32_t color_a = window.framebuffer()[src_y * window.client_width() + src_x];
+						const uint32_t color_b = m_framebuffer.mmap[abs_y * m_framebuffer.width + abs_x];
+
+						m_framebuffer.mmap[abs_y * m_framebuffer.width + abs_x] = alpha_blend(color_a, color_b);
+					}
+				}
 			}
 		}
 	}
@@ -391,6 +539,25 @@ void WindowServer::invalidate(Rectangle area)
 
 void WindowServer::sync()
 {
+	if (m_focused_window && m_is_bouncing_window)
+	{
+		static int32_t dir_x = 7;
+		static int32_t dir_y = 4;
+		auto old_window = m_focused_window->full_area();
+		m_focused_window->set_position({
+			m_focused_window->client_x() + dir_x,
+			m_focused_window->client_y() + dir_y,
+		});
+		auto new_window = m_focused_window->full_area();
+		invalidate(old_window);
+		invalidate(new_window);
+
+		if ((m_focused_window->full_x() < 0 && dir_x < 0) || (m_focused_window->full_x() + m_focused_window->full_width() >= m_framebuffer.width && dir_x > 0))
+			dir_x = -dir_x;
+		if ((m_focused_window->full_y() < 0 && dir_y < 0) || (m_focused_window->full_y() + m_focused_window->full_height() >= m_framebuffer.height && dir_y > 0))
+			dir_y = -dir_y;
+	}
+
 	size_t synced_pages = 0;
 
 	for (size_t i = 0; i < m_pages_to_sync_bitmap.size() * 8; i++)

userspace/programs/WindowServer/WindowServer.h

@@ -19,7 +19,7 @@
 class WindowServer
 {
 public:
-	WindowServer(Framebuffer& framebuffer);
+	WindowServer(Framebuffer& framebuffer, int32_t corner_radius);
 
 	BAN::ErrorOr<void> set_background_image(BAN::UniqPtr<LibImage::Image>);
 
@@ -48,6 +48,8 @@ private:
 	BAN::Vector<BAN::RefPtr<Window>> m_client_windows;
 	BAN::Vector<int> m_client_fds;
 
+	const int32_t m_corner_radius;
+
 	BAN::Vector<uint8_t> m_pages_to_sync_bitmap;
 
 	BAN::UniqPtr<LibImage::Image> m_background_image;
@@ -59,6 +61,7 @@ private:
 
 	bool m_deleted_window { false };
 	bool m_is_stopped { false };
+	bool m_is_bouncing_window = false;
 
 	LibFont::Font m_font;
 };

userspace/programs/WindowServer/main.cpp

@@ -19,6 +19,7 @@
 struct Config
 {
 	BAN::UniqPtr<LibImage::Image> background_image;
+	int32_t corner_radius = 0;
 };
 
 BAN::Optional<BAN::String> file_read_line(FILE* file)
@@ -88,6 +89,15 @@ Config parse_config()
 			else
 				config.background_image = image.release_value();
 		}
+		else if (variable == "corner-radius"_sv)
+		{
+			char* endptr = nullptr;
+			long corner_radius = strtol(value.data(), &endptr, 0);
+			if (corner_radius < 0 || corner_radius == LONG_MAX || corner_radius >= INT32_MAX)
+				dwarnln("invalid corner-radius: '{}'", value);
+			else
+				config.corner_radius = corner_radius;
+		}
 		else
 		{
 			dwarnln("Unknown config variable: {}", variable);
@@ -176,7 +186,7 @@ int main()
 
 	auto config = parse_config();
 
-	WindowServer window_server(framebuffer);
+	WindowServer window_server(framebuffer, config.corner_radius);
 	if (config.background_image)
 		if (auto ret = window_server.set_background_image(BAN::move(config.background_image)); ret.is_error())
 			dwarnln("Could not set background image: {}", ret.error());

userspace/tests/test-window/main.cpp

@@ -10,7 +10,7 @@ void randomize_color(BAN::UniqPtr<LibGUI::Window>& window)
 	uint32_t color = ((rand() % 255) << 16) | ((rand() % 255) << 8) | ((rand() % 255) << 0);
 	for (uint32_t y = 0; y < window->height(); y++)
 		for (uint32_t x = 0; x < window->width(); x++)
-			window->set_pixel(x, y, color);
+			window->set_pixel(x, y, 0xFF000000 | color);
 	window->invalidate();
 }