Perf: Replace slow pixel-by-pixel color loop with Image.composite

[YouCanflyThruMostTheSun]

The PillowResult.get_image method used a slow, pure-Python loop to apply styles, causing significant performance degradation on large images. This commit replaces that implementation with a single, highly-optimized call to Image.composite, using the rendered B&W image as a mask. This reduces rendering time by over 90% in test cases.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 86.25%. Comparing base (92a13a0) to head (07ced97).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
- Coverage   86.25%   86.25%   -0.01%     
==========================================
  Files         165      165              
  Lines        7831     7821      -10     
==========================================
- Hits         6755     6746       -9     
+ Misses       1076     1075       -1     

Flag	Coverage Δ
all/ubuntu-22.04/3.13	86.25% <100.00%> (-0.01%)	:arrow_down:
all/ubuntu-22.04/3.8	86.02% <100.00%> (-0.01%)	:arrow_down:
all/ubuntu-24.04/3.13	86.25% <100.00%> (-0.01%)	:arrow_down:
all/ubuntu-24.04/3.8	86.02% <100.00%> (-0.01%)	:arrow_down:
all/windows-2022/3.13	86.25% <100.00%> (-0.01%)	:arrow_down:
all/windows-2022/3.8	86.02% <100.00%> (-0.01%)	:arrow_down:
all/windows-2025/3.13	86.25% <100.00%> (-0.01%)	:arrow_down:
all/windows-2025/3.8	86.02% <100.00%> (-0.01%)	:arrow_down:
e2e/ubuntu-24.04/3.10	60.33% <100.00%> (-0.04%)	:arrow_down:
e2e/ubuntu-24.04/3.11	60.33% <100.00%> (-0.04%)	:arrow_down:
e2e/ubuntu-24.04/3.12	60.33% <100.00%> (-0.04%)	:arrow_down:
e2e/ubuntu-24.04/3.9	59.67% <100.00%> (-0.04%)	:arrow_down:
e2e/windows-2022/3.10	60.33% <100.00%> (-0.04%)	:arrow_down:
e2e/windows-2022/3.11	60.33% <100.00%> (-0.04%)	:arrow_down:
e2e/windows-2022/3.12	60.33% <100.00%> (-0.04%)	:arrow_down:
e2e/windows-2022/3.9	59.67% <100.00%> (-0.04%)	:arrow_down:
unit/ubuntu-22.04/3.10	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/ubuntu-22.04/3.11	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/ubuntu-22.04/3.12	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/ubuntu-22.04/3.9	82.69% <100.00%> (-0.01%)	:arrow_down:
unit/ubuntu-24.04/3.10	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/ubuntu-24.04/3.11	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/ubuntu-24.04/3.12	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/ubuntu-24.04/3.9	82.69% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2022/3.10	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2022/3.11	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2022/3.12	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2022/3.9	82.69% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2025/3.10	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2025/3.11	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2025/3.12	82.98% <100.00%> (-0.01%)	:arrow_down:
unit/windows-2025/3.9	82.69% <100.00%> (-0.01%)	:arrow_down:

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[Argmaster]

Hi, thank you for your PR. I will try to find time to review and benchmark this soon.

[Argmaster]

Please fix all the code style issues reported by ruff. For a quick guide on how to set up a local dev environment please check out Development documentation. At the moment only style issues reported is a formatting issue which can be auto-fixed with a single command:

poe test-style

[YouCanflyThruMostTheSun]

Please fix all the code style issues reported by ruff. For a quick guide on how to set up a local dev environment please check out Development documentation. At the moment only style issues reported is a formatting issue which can be auto-fixed with a single command:

poe test-style

Thanks for the pointers!

I’ve set up the local dev env per the docs and ran:

poe test-style

This applied the ruff-format changes that CI flagged. I’ve committed and pushed those fixes, so the Style check should pass now.

The PR is ready for your review/benchmarking. I’m happy to tweak anything further (naming, comments, tests, etc.) if you prefer a different approach.