Improves text rendering performance by skipping unnecessary pattern calculations

[AtiX]

This PR improves text rendering performance by skipping costly strokeColor.getPattern() and fillColor.getPattern() calculations when executing showText().

Background: we noticed very slow page render speed for some particular PDFs. After investigation, it turns out that if previously a stroke/fill pattern was set, the pattern is still being calculated independent of whether it's needed or not. This caused a high CPU/memory usage and thus a slow page render speed.

This is one "example culprit" (extract from the PDF):

/Artifact <</BBox[ 35.4331 209.917 290.551 228.917]/Type/Layout>>BDC
Q
19 w /Pattern CS %<-- pattern is set
/Pt0 SCN
/GS2 gs
q
1 0 0 1 35.433098 219.417267 cm
0 0 m
255.117996 0 l
S %<-- pattern is used for the stroke of the line
Q
EMC
/P <</MCID 1>>BDC
/GS3 gs
q
BT
/F2 1 Tf
-0.025 Tw 9 0 0 9 35.433098 784.440125 Tm
(somit)Tj %<-- text "somit" is being rendered, but no stroke rendering has been defined
ET
Q
q
BT

Here is the full pdf of the page - you can open it in Firefox to see how slow it loads:
weil-im-schoenbuch_2025_50_Seite12.pdf

[calixteman]

Good catch ! Thank you for the patch.
Once you fix the 2 nits, I'll run the tests.

[AtiX]

@calixteman thanks for the quick review, PR is updated!

[calixteman]

/botio test

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Received

Command cmd_test from @calixteman received. Current queue size: 0

Live output at: http://54.241.84.105:8877/542b1022030443f/output.txt

[moz-tools-bot]

From: Bot.io (Windows)

---

Received

Command cmd_test from @calixteman received. Current queue size: 0

Live output at: http://54.193.163.58:8877/6181da59a738123/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Failed

Full output at http://54.241.84.105:8877/542b1022030443f/output.txt

Total script time: 39.36 mins

• Unit tests: Passed
• Integration Tests: Passed
• Regression tests: FAILED

  different ref/snapshot: 1

Image differences available at: http://54.241.84.105:8877/542b1022030443f/reftest-analyzer.html#web=eq.log

[moz-tools-bot]

From: Bot.io (Windows)

---

Failed

Full output at http://54.193.163.58:8877/6181da59a738123/output.txt

Total script time: 77.87 mins

• Unit tests: FAILED
• Integration Tests: Passed
• Regression tests: FAILED

  different ref/snapshot: 1

Image differences available at: http://54.193.163.58:8877/6181da59a738123/reftest-analyzer.html#web=eq.log