viewport — GFX2D camera op

• 数据种类:rgb → rgb

• 调用: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) 的矩形并按 scale` 重采样。

> 以下的详细说明为原文 —— 摘要与标题已翻译。

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(示例数据・文献)

• 示例数据目录(下载 URL / 许可证) —— 2-D 用 skimage.data(BSD/公有领域)加合成图,3-D 给出真实数据源(Stanford/PDS 等)的下载 URL。

• 算子来历与参考文献 —— 该算子族所依据的研究/方法出处。

• 算法的正典(作者・年份)与用途见上面的族使用指南。

可运行的示例(实际调用该算子并已验证的样例)

• gfx2d_scene — py -3.11 examples/gfx2d_scene.py

类型可衔接的下一个算子(可接受 rgb 作为输入)

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

同类别(camera)

—

*Provenance: gfx2d.py — GFX2D 算子登记表。本条目由 tools/opdocs.py md 自动生成(请勿手工编辑)。*

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