refactor: preserve original image if smaller than requested thumbnail size

[guqing]

What type of PR is this?

/kind improvement
/area core
/milestone 2.20.x

What this PR does / why we need it:

当生成缩略图时如果原图尺寸小于请求尺寸则返回原图以保持其质量

Which issue(s) this PR fixes:

Fixes #6579

Does this PR introduce a user-facing change?

当生成缩略图时如果原图尺寸小于请求尺寸则返回原图以保持其质量

[f2c-ci-robot]

@guqing: The provided milestone is not valid for this repository. Milestones in this repository: [2.17.x, 2.18.x, 2.19.1, 2.19.x, 2.20.x, Backlog]

Use /milestone clear to clear the milestone.

In response to this:

What type of PR is this?

/kind improvement
/area core
/milestone 2.10.x

What this PR does / why we need it:

当生成缩略图时如果原图尺寸小于请求尺寸则返回原图以保持其质量

Which issue(s) this PR fixes:

Fixes #6579

Does this PR introduce a user-facing change?

当生成缩略图时如果原图尺寸小于请求尺寸则返回原图以保持其质量

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 58.04%. Comparing base (6cd8dc8) to head (4d43720).
Report is 50 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/halo/app/core/attachment/ThumbnailGenerator.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6582      +/-   ##
============================================
- Coverage     58.18%   58.04%   -0.14%     
- Complexity     3774     3916     +142     
============================================
  Files           651      670      +19     
  Lines         22125    22963     +838     
  Branches       1538     1574      +36     
============================================
+ Hits          12873    13330     +457     
- Misses         8641     9017     +376     
- Partials        611      616       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ruibaby]

/cherry-pick release-2.19

[halo-dev-bot]

@ruibaby: once the present PR merges, I will cherry-pick it on top of release-2.19 in a new PR and assign it to you.

In response to this:

/cherry-pick release-2.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ruibaby]

/lgtm

[JohnNiang]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• OWNERS [JohnNiang]

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[halo-dev-bot]

@ruibaby: new pull request created: #6583

In response to this:

/cherry-pick release-2.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.