viewport — GFX2D camera op

• 資料種類:rgb → rgb

• 呼叫:import gfx2d; gfx2d.viewport(img, x, y, width, height, scale=1.0, interp='bilinear')(或 opsgfx2d.get("viewport"))

用法

裁出 `(x, y, width, height) 的矩形並按 scale` 重取樣。

> 以下的詳細說明為原文 —— 摘要與標題已翻譯。

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.

參考(範例資料・文獻)

• 範例資料目錄(下載 URL / 授權) —— 2-D 用 skimage.data(BSD/公有領域)加合成圖,3-D 給出真實資料源(Stanford/PDS 等)的下載 URL。

• 運算子來歷與參考文獻 —— 該運算子族所依據的研究/方法出處。

• 演算法的正典(作者・年份)與用途見上面的族使用指南。

可執行的範例(實際呼叫該運算子並已驗證的樣例)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

型別可銜接的下一個運算子(可接受 rgb 作為輸入)

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

同類別(camera)

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*Provenance: gfx2d.py — GFX2D 運算子登記表。本條目由 tools/opdocs.py md 自動產生(請勿手動編輯)。*

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