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FlappyBug: Only paint areas which need to be painted

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Drawing the entire PNG background is rather expensive. Instead, only
draw the rects that are updating.
This commit is contained in:
Timothy Flynn 2021-07-10 17:15:38 -04:00 • committed by Andreas Kling
parent e2299b52de
commit dd65f52331
2 changed files with 17 additions and 4 deletions
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19
Userland/Games/FlappyBug/Game.cpp
View file

@ -69,12 +69,12 @@ void Game::paint_event(GUI::PaintEvent& event)
painter.draw_scaled_bitmap(enclosing_int_rect(m_bug.rect()), *m_bug.current_bitmap(), m_bug.flapping_bitmap->rect()); painter.draw_scaled_bitmap(enclosing_int_rect(m_bug.rect()), *m_bug.current_bitmap(), m_bug.flapping_bitmap->rect());
if (m_active) { if (m_active) {
painter.draw_text({ 10, 10, 100, 100 }, String::formatted("{:.0}", m_difficulty), Gfx::TextAlignment::TopLeft, Color::White); painter.draw_text(m_score_rect, String::formatted("{:.0}", m_difficulty), Gfx::TextAlignment::TopLeft, Color::White);
} else if (m_high_score.has_value()) { } else if (m_high_score.has_value()) {
auto message = String::formatted("Your score: {:.0}\nHigh score: {:.0}\n\n{}", m_last_score, m_high_score.value(), m_restart_cooldown < 0 ? "Press any key to play again" : " "); auto message = String::formatted("Your score: {:.0}\nHigh score: {:.0}\n\n{}", m_last_score, m_high_score.value(), m_restart_cooldown < 0 ? "Press any key to play again" : " ");
painter.draw_text(rect(), message, Gfx::TextAlignment::Center, Color::White); painter.draw_text(m_text_rect, message, Gfx::TextAlignment::Center, Color::White);
} else { } else {
painter.draw_text(rect(), "Press any key to start", Gfx::TextAlignment::Center, Color::White); painter.draw_text(m_text_rect, "Press any key to start", Gfx::TextAlignment::Center, Color::White);
} }
} }
@ -97,7 +97,18 @@ void Game::keydown_event(GUI::KeyEvent& event)
void Game::tick() void Game::tick()
{ {
auto queue_update = [&]() {
update(m_score_rect);
update(m_text_rect);
update(enclosing_int_rect(m_bug.rect()));
update(enclosing_int_rect(m_obstacle.top_rect()));
update(enclosing_int_rect(m_obstacle.bottom_rect()));
update(m_cloud.rect());
};
if (m_active) { if (m_active) {
queue_update();
m_difficulty += 1.0f / 16.0f; m_difficulty += 1.0f / 16.0f;
m_bug.fall(); m_bug.fall();
@ -124,7 +135,7 @@ void Game::tick()
m_restart_cooldown -= 1.0f / 16.0f; m_restart_cooldown -= 1.0f / 16.0f;
update(); queue_update();
} }
} }

2
Userland/Games/FlappyBug/Game.h
View file

@ -148,6 +148,8 @@ private:
float m_difficulty {}; float m_difficulty {};
float m_restart_cooldown {}; float m_restart_cooldown {};
const RefPtr<Gfx::Bitmap> m_background_bitmap { Gfx::Bitmap::load_from_file("/res/icons/flappybug/background.png") }; const RefPtr<Gfx::Bitmap> m_background_bitmap { Gfx::Bitmap::load_from_file("/res/icons/flappybug/background.png") };
const Gfx::IntRect m_score_rect { 10, 10, 20, 20 };
const Gfx::IntRect m_text_rect { game_width / 2 - 80, game_height / 2 - 40, 160, 80 };
}; };
} }