Compress large PNGs that are not pixel art #1683
Description
At the time of writing we have 21 MB of PNGs in the game source tree.
Here are some of the largest:
$ find -name '*.png' -print0 | xargs -0 du -shc | sort -h | tail -n 20
84K ./scenes/globals/scene_switcher/transitions/Radial.png
84K ./scenes/quests/story_quests/shjourney/4_Laberinto/personajes/mapa3/alfombra1.png
112K ./scenes/game_elements/characters/player/components/blow.png
152K ./scenes/quests/story_quests/shjourney/4_Laberinto/personajes/presentacion/baldozas1.png
188K ./docs/screenshot.png
196K ./scenes/quests/story_quests/shjourney/4_Laberinto/personajes/escuela/pisomayolica2.png
212K ./scenes/game_elements/props/tree/components/wind_noise.png
212K ./scenes/quests/story_quests/renya_beyond_sorrow/1_moscas/tree/components/wind_noise.png
240K ./assets/first_party/intro/sketch_04.png
316K ./assets/first_party/intro/sketch_05.png
320K ./assets/first_party/intro/sketch_01.png
380K ./scenes/ui_elements/story_quest_progress/Textures/book_turn_right.png
392K ./scenes/ui_elements/story_quest_progress/Textures/book_turn_left.png
488K ./assets/first_party/intro/sketch_02.png
604K ./assets/first_party/intro/sketch_03.png
1.3M ./scenes/quests/lore_quests/quest_001/Musician.png
1.4M ./scenes/quests/story_quests/shjourney/7_shjourney_combate/assets/tilesetCombate final.png
1.7M ./scenes/quests/lore_quests/quest_002/Void.png
4.7M ./assets/first_party/intro/background.png
22M total
By default, Godot does not compress PNGs: it stores them losslessly. https://docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_images.html#compress-mode
Most of the top 10 are in assets/first_party/intro. They're not pixel art: they're sketches, and a fabric weave background. We should apply lossy compression to these.
We could do this either by converting the files lossily to WebP, or adjusting their import settings, or both. I am not quite sure based on the documentation linked above what happens if the source file is a lossy WebP - does it get stored as-is?
XP Summary (total 225)
| Subdomain | Skill | XP |
|---|---|---|
| Engineering: Optimization & Performance | Problem Solving | 75 |
| Engineering: Optimization & Performance | Creativity & Design Thinking | 75 |
| Engineering: Optimization & Performance | Technical Literacy | 75 |