ladybird/Userland/Utilities/pixelflut.cpp
kleines Filmröllchen bdd92e881f pixelflut: Implement alternative flooding strategies
These allow column-wise, traditional scanline, or random pixel flooding.
Depending on the use case and amount of contestion, any of the
strategies may work best, as tested on 37c3.
2024-01-12 16:10:28 -07:00

230 lines
7.8 KiB
C++

/*
* Copyright (c) 2023, kleines Filmröllchen <filmroellchen@serenityos.org>.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Error.h>
#include <AK/NonnullRefPtr.h>
#include <AK/QuickSelect.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/EventLoop.h>
#include <LibCore/Socket.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Size.h>
#include <LibImageDecoderClient/Client.h>
#include <LibMain/Main.h>
constexpr StringView get_command = "SIZE\n"sv;
// Which strategies to use for flooding the image to the server.
enum class FloodStrategy {
// Send image row by row, like a CRT scanline.
Scanline,
// Send random pixels.
Random,
// Send image column by column.
Columns,
};
static Optional<FloodStrategy> parse_strategy(StringView name)
{
if (name.equals_ignoring_ascii_case("scanline"sv))
return FloodStrategy::Scanline;
if (name.equals_ignoring_ascii_case("random"sv))
return FloodStrategy::Random;
if (name.equals_ignoring_ascii_case("columns"sv))
return FloodStrategy::Columns;
return {};
}
// Client for the Pixelflut protocol
// https://github.com/defnull/pixelflut#pixelflut-protocol
class Client : public RefCounted<Client> {
public:
static ErrorOr<NonnullRefPtr<Client>> create(StringView image_path, StringView server, size_t x, size_t y, FloodStrategy strategy);
ErrorOr<void> run();
private:
Client(NonnullOwnPtr<Core::BufferedTCPSocket>, NonnullRefPtr<Gfx::Bitmap>, Gfx::IntSize, Gfx::IntPoint, FloodStrategy);
ErrorOr<void> send_current_pixel();
void next_scanline_pixel();
void next_random_pixel();
void next_column_pixel();
NonnullOwnPtr<Core::BufferedTCPSocket> m_socket;
NonnullRefPtr<Gfx::Bitmap> const m_image;
Gfx::IntSize const m_canvas_size;
Gfx::IntPoint const m_image_offset;
Gfx::IntPoint m_current_point { 0, 0 };
FloodStrategy m_strategy;
};
ErrorOr<NonnullRefPtr<Client>> Client::create(StringView image_path, StringView server, size_t x, size_t y, FloodStrategy strategy)
{
// Extract hostname and port and connect to server.
auto parts = server.split_view(':');
auto maybe_port = parts.take_last().to_number<unsigned>();
if (!maybe_port.has_value())
return Error::from_string_view("Invalid port number"sv);
auto port = maybe_port.release_value();
auto hostname = TRY(String::join(':', parts));
auto socket = TRY(Core::BufferedTCPSocket::create(TRY(Core::TCPSocket::connect(hostname.to_byte_string(), port))));
// Ask the server for the canvas size.
TRY(socket->write_until_depleted(get_command.bytes()));
auto buffer = TRY(ByteBuffer::create_zeroed(KiB));
auto size_line = TRY(socket->read_line(buffer));
if (!size_line.starts_with("SIZE"sv))
return Error::from_string_view("Server didn't return size correctly"sv);
auto size_parts = size_line.split_view(' ');
auto maybe_width = size_parts[1].to_number<unsigned>();
auto maybe_height = size_parts[2].to_number<unsigned>();
if (!maybe_width.has_value() || !maybe_height.has_value())
return Error::from_string_view("Width or height invalid"sv);
auto width = maybe_width.release_value();
auto height = maybe_height.release_value();
Gfx::IntSize canvas_size = { width, height };
// Read input image.
auto image_file = TRY(Core::File::open(image_path, Core::File::OpenMode::Read));
auto image_decoder = TRY(ImageDecoderClient::Client::try_create());
ScopeGuard guard = [&] { image_decoder->shutdown(); };
auto byte_buffer = TRY(image_file->read_until_eof(16 * KiB));
auto maybe_image = image_decoder->decode_image(byte_buffer);
if (!maybe_image.has_value())
return Error::from_string_view("Image could not be read"sv);
auto image = maybe_image->frames.take_first().bitmap;
// Make sure to not draw out of bounds; some servers will disconnect us for that!
if (image->width() > canvas_size.width()) {
auto fitting_scale = static_cast<float>(canvas_size.width()) / image->width();
image = TRY(image->scaled(fitting_scale, fitting_scale));
}
return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) Client(move(socket), move(image), canvas_size, Gfx::IntPoint { x, y }, strategy)));
}
Client::Client(NonnullOwnPtr<Core::BufferedTCPSocket> socket, NonnullRefPtr<Gfx::Bitmap> image, Gfx::IntSize canvas_size, Gfx::IntPoint image_offset, FloodStrategy strategy)
: m_socket(move(socket))
, m_image(move(image))
, m_canvas_size(canvas_size)
, m_image_offset(image_offset)
, m_strategy(strategy)
{
outln("Connected to server, image {}, canvas size {}", m_image, m_canvas_size);
}
ErrorOr<void> Client::run()
{
Function<void(void)> next_pixel = [this] { this->next_scanline_pixel(); };
if (m_strategy == FloodStrategy::Columns)
next_pixel = [this] { this->next_column_pixel(); };
else if (m_strategy == FloodStrategy::Random)
next_pixel = [this] { this->next_random_pixel(); };
while (true) {
TRY(send_current_pixel());
next_pixel();
}
}
ErrorOr<void> Client::send_current_pixel()
{
auto color = m_image->get_pixel(m_current_point);
if (color.alpha() == 0)
return {};
auto hex = color.to_byte_string();
// Pixelflut requires hex colors without leading hash.
auto hex_without_hash = hex.substring(1);
// PX <x> <y> <hex color>
while (true) {
auto result = m_socket->write_formatted("PX {} {} {}\n", m_current_point.x() + m_image_offset.x(), m_current_point.y() + m_image_offset.y(), hex_without_hash);
// Very contested servers will cause frequent EAGAIN errors.
if (!result.is_error() || result.error().code() != EAGAIN)
break;
}
return {};
}
void Client::next_scanline_pixel()
{
m_current_point.set_x(m_current_point.x() + 1);
if (m_current_point.x() >= m_image->width()) {
m_current_point.set_x(0);
m_current_point.set_y(m_current_point.y() + 1);
if (m_current_point.y() >= m_image->height()) {
m_current_point.set_x(0);
m_current_point.set_y(0);
}
}
}
void Client::next_column_pixel()
{
m_current_point.set_y(m_current_point.y() + 1);
if (m_current_point.y() >= m_image->height()) {
m_current_point.set_y(0);
m_current_point.set_x(m_current_point.x() + 1);
if (m_current_point.x() >= m_image->width()) {
m_current_point.set_x(0);
m_current_point.set_y(0);
}
}
}
void Client::next_random_pixel()
{
m_current_point = {
AK::random_int(0, m_image->width() - 1),
AK::random_int(0, m_image->height() - 1),
};
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
Core::EventLoop loop;
StringView image_path;
size_t x;
size_t y;
StringView server;
StringView strategy_string { "scanline"sv };
Core::ArgsParser args_parser;
args_parser.add_option(image_path, "Image to send to server", "image", 'i', "IMAGE");
args_parser.add_option(x, "Target x coordinate of the image on the server", "x", 'x', "X");
args_parser.add_option(y, "Target y coordinate of the image on the server", "y", 'y', "Y");
args_parser.add_option(strategy_string, "Pixel flooding strategy (scanline, random or column; default: scanline)", "strategy", 'm', "STRATEGY");
args_parser.add_positional_argument(server, "Pixelflut server (hostname:port)", "server");
args_parser.parse(arguments);
if (image_path.is_empty()) {
warnln("Error: -i argument is required");
return 1;
}
auto maybe_strategy = parse_strategy(strategy_string);
if (!maybe_strategy.has_value()) {
warnln("Error: Strategy {} invalid", strategy_string);
return 1;
}
auto client = TRY(Client::create(image_path, server, x, y, maybe_strategy.release_value()));
TRY(client->run());
return 0;
}