Add Canvas Capture Strategy

[markushi]

📜 Description

Adds an experimental option to enable an alternate way to capture screenshots, using a fake Canvas which draws rectangles instead of text, producing a safer way to mask all sensitive content.

💡 Motivation and Context

No masking issues.

💚 How did you test it?

Manually

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	375.72 ms	457.44 ms	81.72 ms
Size	1.58 MiB	2.12 MiB	547.74 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
23d6b12	354.10 ms	408.38 ms	54.28 ms
9fbb112	361.43 ms	427.57 ms	66.14 ms
1df7eb6	397.04 ms	429.64 ms	32.60 ms
c8125f3	397.65 ms	485.14 ms	87.49 ms
ee747ae	358.21 ms	389.41 ms	31.20 ms
b750b96	408.98 ms	480.32 ms	71.34 ms
f634d01	359.58 ms	433.88 ms	74.30 ms
806307f	357.85 ms	424.64 ms	66.79 ms
ee747ae	374.71 ms	455.18 ms	80.47 ms
ce0a49e	532.00 ms	609.96 ms	77.96 ms

App size

Revision	Plain	With Sentry	Diff
23d6b12	1.58 MiB	2.10 MiB	532.31 KiB
9fbb112	1.58 MiB	2.11 MiB	539.18 KiB
1df7eb6	1.58 MiB	2.10 MiB	532.97 KiB
c8125f3	1.58 MiB	2.10 MiB	532.32 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
b750b96	1.58 MiB	2.10 MiB	533.19 KiB
f634d01	1.58 MiB	2.10 MiB	533.40 KiB
806307f	1.58 MiB	2.10 MiB	533.42 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
ce0a49e	1.58 MiB	2.10 MiB	532.94 KiB

Previous results on branch: markushi/canvas-approach

Startup times

Revision	Plain	With Sentry	Diff
1b16487	375.34 ms	440.81 ms	65.47 ms
1b42121	377.29 ms	423.63 ms	46.34 ms
0a0b1e3	353.33 ms	370.31 ms	16.98 ms
8b9eb06	389.33 ms	448.42 ms	59.09 ms
191c05d	370.45 ms	429.70 ms	59.25 ms
04bebea	403.28 ms	417.84 ms	14.56 ms
8b7fc28	390.50 ms	444.36 ms	53.86 ms

App size

Revision	Plain	With Sentry	Diff
1b16487	1.58 MiB	2.12 MiB	547.06 KiB
1b42121	1.58 MiB	2.12 MiB	547.01 KiB
0a0b1e3	1.58 MiB	2.11 MiB	542.83 KiB
8b9eb06	1.58 MiB	2.12 MiB	547.07 KiB
191c05d	1.58 MiB	2.12 MiB	547.71 KiB
04bebea	1.58 MiB	2.12 MiB	547.06 KiB
8b7fc28	1.58 MiB	2.11 MiB	543.01 KiB

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 9caa949

[cursor]

Bug: CanvasStrategy Fails to Close ImageReaders

The CanvasStrategy.close() method doesn't close the ImageReader instances held in freePictureRef and unprocessedPictureRef. These ImageReaders allocate native resources that require explicit cleanup, leading to resource leaks.