lovell/sharp

Enhancement: add support to extend feature for width and height

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#1,072 建立於 2017年12月19日

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 (9 留言) (0 反應) (0 負責人)JavaScript (31,994 star) (1,389 fork)batch import
enhancementhelp wanted

描述

Hello,

is there a way to pad an image if it's smaller than required dimensions?

For example:

desired dimensions actual dimensions expected result
1000x1000 200x200 1000x1000 image with 200x200 centered inside
300x300 350x350 downscaled to 300x300

Original original

Desired output large

貢獻者指南

技術棧
javascriptnodejs
領域
backendfull stack
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-2 days
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
mostly clear
前置要求
Understanding of sharp's image processing pipelineFamiliarity with libvips extend operationBasic knowledge of Node.js and JavaScript
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30
研究方向
This feature request asks for adding support to extend an image to fit desired dimensions, padding if necessary. libvips already supports extend with gravity options. The implementation should modify sharp's resize logic to accept an extend/gravity parameter. Look at libvips documentation for `vips gravity` and `vips extend`. The issue's comments contain discussions about implementation approaches. To proceed, review the existing resize code in `src/pipeline.cc` and `lib/resize.js`. Consider adding a `position` or `gravity` option to the `.resize()` method.