atlas: 生成されたatlasの未使用ピクセル数（RGBA→0,0,0,0）を取得するexamplesの実装

[yud0uhu]

Close #600

Description（変更内容）

• atlas: テクスチャアトラス化手法の調査 #582 にて調査したアルゴリズムを実装するために、アルゴリズム間の比較を行うための前準備として、最適化度を計測する指標（atlasの未使用ピクセル数を取得する）のexamplesを追加しました。

Manual Testing（手動テスト）

プロジェクトのディレクトリ直下で以下のコマンドを実行すると、挙動が確認できます。

git checkout feature/examples-texture-atlas-unused-pixels
cd nusamai-atlas
cargo run -- -u examples/output/0.png
# cargo run -- -unused_pixels examples/output/0.png

出力結果

PlacedTextureInfo { id: "texture_yellow_dice_0", atlas_id: "0", origin: (1, 1), width: 80, height: 48, placed_uv_coords: [(0.158203125, 0.998046875), (0.001953125, 0.904296875), (0.158203125, 0.904296875)] }
PlacedTextureInfo { id: "texture_yellow_dice_1", atlas_id: "0", origin: (82, 1), width: 80, height: 47, placed_uv_coords: [(0.16015625, 0.998046875), (0.31640625, 0.90625), (0.31640625, 0.998046875)] }
PlacedTextureInfo { id: "texture_yellow_dice_2", atlas_id: "0", origin: (1, 50), width: 80, height: 48, placed_uv_coords: [(0.001953125, 0.90234375), (0.158203125, 0.80859375), (0.158203125, 0.90234375)] }
// ...
Unused pixels: 231195

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Additional details and impacted files

Components	Coverage Δ
GUI	∅ <ø> (∅)
Backend	82.03% <ø> (ø)
Libraries	83.20% <ø> (ø)

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