lovell/sharp

Enhancement: add support to extend feature for width and height

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#1,072 创建于 2017年12月19日

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 (9 评论) (0 反应) (0 负责人)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

贡献者指南

技术栈
javascriptnodejs
领域
backendfull stack
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-2 days
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
mostly clear
前置要求
Understanding of sharp's image processing pipelineFamiliarity with libvips extend operationBasic knowledge of Node.js and JavaScript
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
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.