Use FFI/JNI for captureEnvelope on iOS and Android

[buenaflor]

Step towards #1444

💚 How did you test it?

It's currently hard to mock JNI/FFI calls so we'll be relying on integration tests and verifying that method channel calls are not made anymore for captureEnvelope

Performance improvement is marginal but an improvement nonetheless

---

iOS:
FFI calls (26 samples):
Average ≈ 2 967.4 microseconds

Channel calls (25 samples):
Average ≈ 3 264.5 microseconds

---

Android:
JNI calls (33 samples):
Average ≈ 1 012.8 microseconds

Channel calls (32 samples):
Average ≈ 1 462.5 microseconds

---

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

@sentry review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.79%. Comparing base (36820e8) to head (23ae401).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3115      +/-   ##
==========================================
+ Coverage   87.77%   87.79%   +0.02%     
==========================================
  Files         291      103     -188     
  Lines        9952     4097    -5855     
==========================================
- Hits         8735     3597    -5138     
+ Misses       1217      500     -717     

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

[github-actions]

iOS Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1271.96 ms	1271.44 ms	-0.52 ms
Size	5.53 MiB	5.97 MiB	453.71 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
73dca78	1246.65 ms	1265.42 ms	18.76 ms
c8596a6	1234.11 ms	1241.19 ms	7.08 ms
7cfee3b	1260.90 ms	1273.14 ms	12.24 ms
eca355d	1238.39 ms	1266.98 ms	28.59 ms
79f6b41	1269.33 ms	1279.71 ms	10.38 ms
ec78888	1251.37 ms	1269.40 ms	18.04 ms
2d34233	1258.19 ms	1268.92 ms	10.73 ms
793f4dc	1262.50 ms	1282.35 ms	19.85 ms
4481076	1256.48 ms	1266.64 ms	10.17 ms
93b7728	1247.23 ms	1264.87 ms	17.64 ms

App size

Revision	Plain	With Sentry	Diff
73dca78	7.86 MiB	9.44 MiB	1.58 MiB
c8596a6	7.86 MiB	9.44 MiB	1.58 MiB
7cfee3b	20.70 MiB	22.46 MiB	1.75 MiB
eca355d	7.86 MiB	9.44 MiB	1.58 MiB
79f6b41	7.86 MiB	9.44 MiB	1.58 MiB
ec78888	7.86 MiB	9.44 MiB	1.58 MiB
2d34233	7.86 MiB	9.44 MiB	1.58 MiB
793f4dc	7.86 MiB	9.44 MiB	1.58 MiB
4481076	7.86 MiB	9.44 MiB	1.58 MiB
93b7728	7.86 MiB	9.44 MiB	1.58 MiB

Previous results on branch: enh/ffi-jni-capture-envelope

Startup times

Revision	Plain	With Sentry	Diff
f61db9e	1225.65 ms	1228.74 ms	3.10 ms
4d265af	1274.31 ms	1284.55 ms	10.24 ms
d9df09c	1271.86 ms	1274.88 ms	3.02 ms
8243b86	1256.24 ms	1268.31 ms	12.06 ms
5fa2e5f	1233.29 ms	1237.04 ms	3.75 ms
fcdc0a0	1270.39 ms	1282.24 ms	11.86 ms

App size

Revision	Plain	With Sentry	Diff
f61db9e	5.53 MiB	5.97 MiB	453.66 KiB
4d265af	7.86 MiB	9.45 MiB	1.59 MiB
d9df09c	5.53 MiB	5.97 MiB	454.13 KiB
8243b86	7.86 MiB	9.45 MiB	1.59 MiB
5fa2e5f	7.86 MiB	9.45 MiB	1.59 MiB
fcdc0a0	7.86 MiB	9.45 MiB	1.59 MiB

[github-actions]

Android Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	467.52 ms	468.60 ms	1.08 ms
Size	13.93 MiB	14.93 MiB	1.00 MiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
93b7728	475.28 ms	489.13 ms	13.86 ms
c8596a6	474.00 ms	492.96 ms	18.96 ms
73a3c38	478.18 ms	526.62 ms	48.44 ms
0fb45d0	482.79 ms	554.02 ms	71.23 ms
640ad0c	466.00 ms	552.67 ms	86.67 ms
765aa8b	493.51 ms	531.23 ms	37.72 ms
cc4e375	426.15 ms	482.34 ms	56.19 ms
c1e775e	482.36 ms	608.98 ms	126.62 ms
2d34233	470.54 ms	558.90 ms	88.36 ms
54acf91	487.24 ms	529.60 ms	42.36 ms

App size

Revision	Plain	With Sentry	Diff
93b7728	6.54 MiB	7.69 MiB	1.15 MiB
c8596a6	6.54 MiB	7.53 MiB	1015.27 KiB
73a3c38	6.54 MiB	7.69 MiB	1.15 MiB
0fb45d0	6.54 MiB	7.70 MiB	1.17 MiB
640ad0c	6.54 MiB	7.69 MiB	1.15 MiB
765aa8b	6.54 MiB	7.70 MiB	1.16 MiB
cc4e375	6.54 MiB	7.69 MiB	1.15 MiB
c1e775e	6.54 MiB	7.70 MiB	1.17 MiB
2d34233	6.54 MiB	7.55 MiB	1.01 MiB
54acf91	6.54 MiB	7.70 MiB	1.17 MiB

Previous results on branch: enh/ffi-jni-capture-envelope

Startup times

Revision	Plain	With Sentry	Diff
8243b86	480.34 ms	499.35 ms	19.01 ms
f61db9e	458.13 ms	464.74 ms	6.61 ms
fcdc0a0	504.15 ms	536.24 ms	32.09 ms
4d265af	451.48 ms	506.33 ms	54.85 ms
5fa2e5f	508.60 ms	556.53 ms	47.93 ms

App size

Revision	Plain	With Sentry	Diff
8243b86	6.54 MiB	7.71 MiB	1.17 MiB
f61db9e	13.93 MiB	14.93 MiB	1.00 MiB
fcdc0a0	6.54 MiB	7.71 MiB	1.17 MiB
4d265af	6.54 MiB	7.71 MiB	1.17 MiB
5fa2e5f	6.54 MiB	7.71 MiB	1.17 MiB

[github-actions]

🚨 Detected changes in high risk code 🚨

High-risk code has higher potential to break the SDK and may be hard to test. To prevent severe bugs, apply the rollout process for releasing such changes and be extra careful when changing and reviewing these files:

• flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt

[denrase]

LGTM 👍