fullseye

viewport — GFX2D camera op

• データ種: rgb → rgb
• 呼び出し: import fullseye as fs; fs.ledger.viewport(img, x, y, width, height, scale=1.0, interp='bilinear') (実装を直接呼ぶなら import gfx2d; gfx2d.viewport(img, x, y, width, height, scale=1.0, interp='bilinear')、台帳から引くなら opsgfx2d.get("viewport"))

使い方

Crop the rectangle at (x, y, width, height) and resample it by scale.

Accepts rgb or rgba (straight alpha; the crop is a copy, so no premultiplication is involved) and returns the same channel count.

Out-of-bounds raises, unlike :func:sprite_blit, which clips. The asymmetry is the point: a sprite leaving the screen is the normal case, while a camera asking for rows the image does not have is arithmetic that has already gone wrong somewhere upstream, and returning a partly black frame would let it keep going.

scale=1 with integer bounds returns an exact sub-array copy — no interpolation touches it.

参考(サンプルデータ・文献)

• サンプルデータ カタログ(DL URL / ライセンス) — 2-D は skimage.data(BSD/public)+ 合成、3-D は実データ源(Stanford/PDS 等)の DL URL。
• 演算子の来歴・参考文献 — この op 族の元になった研究/手法の出典。
• アルゴリズムの正典(著者・年)と用途は上記ファミリ使い方ガイドに記載。

実行できる例(この op を実際に呼ぶ検証済みサンプル)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

型が繋がる次の op(rgb を入力に取れる)

srgb_to_linear · linear_to_srgb · blend_mode · light_mask · normal_map_decode · bloom · vignette · chromatic_aberration

同カテゴリ(camera)

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Provenance: gfx2d.py — GFX2D operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。

© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.

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