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fix: 首页「最近项目」缩略图与退出前视角不一致,出现偏移或裁切 (#111)
- 封面使用真实画布尺寸及最终 viewport.x/y/scale。
- 320×240 封面改为居中 cover 裁切,不再从左上角取景。
- 正确绘制画布背景色。

in canva:
![shotmd-1784874081.jpg](/attachments/4ac128cc-64c8-4a78-9e75-c35902049d3e)
![shotmd-1784876202.jpg](/attachments/6197259b-887e-4fd6-95b5-b722ec670a02)

in home:
![shotmd-1784874090.jpg](/attachments/241c7cd3-1eee-4f7b-96f2-4ca0268d2bee)
![shotmd-1784876211.jpg](/attachments/aa4200b6-bef0-4122-a797-ebc082b27a17)

因为原本的布局持久化可能有一些bug,改动不相关,所以我回退到最开始的一版:
- 不额外监听画布尺寸变化,给最小尺寸兜底,(大了比小了好)
- 封面不要求强一致性,生成/上传时机仍然按照原来随布局持久化

优化了封面生成:
- 改用webp格式
- 尽量利用图片缓存

最终生成封面从700ms加速到150ms以内, 加上必须的上传和确认150ms 和 布局持久化的时间相差不多,不是特别离谱的手速都能保证两者一致

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Co-authored-by: kdletters <kdletters@qq.com>
Reviewed-on: http://192.168.35.82/git/GenarrativeAI/Genarrative/pulls/111
Co-authored-by: 王德宇 <kvtodev@outlook.com>
Co-committed-by: 王德宇 <kvtodev@outlook.com>
2026-07-29 16:09:30 +08:00
..