viewport — GFX2D camera op

• データ種: rgb → rgb

• 呼び出し: import gfx2d; gfx2d.viewport(img, x, y, width, height, scale=1.0, interp='bilinear') (または 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.