Kotlin Multiplatform: Compose code as a Codename One app by shai-almog · Pull Request #6106 · codenameone/CodenameOne

shai-almog · 2026-10-25T19:12:55Z

A Kotlin Multiplatform module's commonMain builds as a Codename One application for every target. kotlinc compiles it for the JVM with the Compose compiler plugin. The Compose runtime and kotlinx.coroutines ship unmodified, and maven/compose-compat replaces only the UI layer, writing it over Codename One components.

Benchmarks

The same commonMain was built both ways and run on the iPhone 17 Pro simulator (scripts/kmp-bench).

	Codename One	Compose Multiplatform
Executable, stripped	16.4 MB	22.9 MB
App bundle	27.3 MB	28.8 MB
Physical footprint	47-48 MB	48 MB
Start-up	596-685 ms	646-794 ms

For reference, an empty UIKit app measures 34 MB and starts in 640-750 ms on the same simulator.

What's included

Compose UI layer (compose-compat): layout policies, modifiers, text, material3 and animation. LazyColumn and LazyRow compose only the items in view. The top app bar and navigation bar now pad by the part of the safe area their host actually lies under, so the bar no longer draws under the status bar.
Import and build: cn1:import-kmp-project, a compose profile in the archetype, and Gradle support. Gradle stops with the line to add if the Compose plugin isn't applied, and convert-to-gradle writes that line.
ParparVM: field updaters are lowered at translate time, ServiceLoader resolves through a registry built at translate time, and JavaAPI gains the classes the Compose runtime and coroutines need.
Memory: loading the theme no longer leaves 24k strings behind (ThemeStrings), and Font.derive finds a cached font without building a key. Live heap drops from 3.7 MB to 3.2 MB, and footprint by about 2 MB.
hellocodenameone: moves from Kotlin 1.6 to 2.2.10, with four KmpCompat* screenshot tests covering layout, typography, lists and state/animation. Their goldens get seeded on CI.
Docs: a new developer guide chapter, "Running Kotlin Multiplatform and Compose applications", with a build-pipeline diagram, a runtime-layers diagram, the benchmark chart and a side-by-side screenshot.

Verified locally

core-unittests: 8161 tests pass, SpotBugs reports 0 findings.
compose-compat: tests pass, SpotBugs reports 0 findings.
Vale is clean on the new chapter.
iOS simulator: the layout now matches the CMP build.

LanguageTool and the screenshot suites were not run locally; they run on CI.

🤖 Generated with Claude Code

A KMP module's commonMain (and its JVM source set) builds as a Codename One application: kotlinc compiles it for the JVM with the Compose compiler plugin, the unmodified Compose runtime and kotlinx.coroutines ship as they are, and maven/compose-compat provides the UI layer over Codename One components. - compose-compat: Modifier chains, Box/Row/Column/Lazy layout policies, text, material3, animation; top and navigation bars pad by the part of the safe area their host lies under, read at measure time. - cn1:import-kmp-project, the archetype compose profile, Gradle support. - ParparVM: field updaters lowered at translate time, ServiceLoader registry, the JavaAPI classes the Compose runtime and coroutines need. - Theme loading no longer leaves 24k strings behind (ThemeStrings), and Font.derive finds a cached font without building a key. - hellocodenameone moves to Kotlin 2.2.10 and carries KmpCompat screenshot tests; scripts/kmp-bench compares the same source against Compose Multiplatform; new developer guide chapter with diagrams. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog · 2026-10-25T19:21:44Z

Compared 12 screenshots: 12 matched.
✅ JavaSE simulator integration screenshots matched stored baselines.

shai-almog · 2026-10-25T19:29:39Z

Native fidelity (Android, Material 3)

54 pairs compared -- median 95.6%, worst 91.3% (FlatButton_pressed_dark), 25th pct 94.9%, mean 95.7%.

Distribution -- >=99%: 2 | 95-99%: 37 | 90-95%: 15 | <90%: 0

Component	State	Appearance	Material	Fidelity	SSIM	mean delta	Geometry
FlatButton	pressed	dark	normal	91.3%	0.899	3.10	ok
Tabs	normal	light	normal	92.3%	0.914	3.05	ok
Button	pressed	dark	normal	92.6%	0.949	4.32	ok
FlatButton	normal	dark	normal	93.2%	0.938	2.69	ok
Button	disabled	dark	normal	93.3%	0.928	2.20	ok
Button	pressed	light	normal	93.3%	0.952	3.68	ok
FlatButton	normal	light	normal	93.7%	0.941	2.29	ok
FlatButton	pressed	light	normal	93.8%	0.942	2.56	ok
FloatingActionButton	pressed	light	normal	94.4%	0.927	2.82	OFF (h 0.88)
RadioButton	normal	dark	normal	94.5%	0.963	2.19	ok
RadioButton	normal	light	normal	94.7%	0.964	1.85	ok
CheckBox	selected	dark	normal	94.7%	0.950	2.60	ok
RadioButton	selected	dark	normal	94.8%	0.963	2.42	ok
CheckBox	normal	dark	normal	94.9%	0.952	2.69	ok
Button	normal	dark	normal	94.9%	0.949	3.16	ok
CheckBox	normal	light	normal	95.0%	0.953	2.30	ok
Toolbar	normal	dark	normal	95.1%	0.906	1.60	ok
RaisedButton	pressed	dark	normal	95.2%	0.950	2.39	ok
CheckBox	disabled	dark	normal	95.2%	0.954	1.47	ok
CheckBox	disabled	light	normal	95.2%	0.956	1.34	ok
Tabs	normal	dark	normal	95.2%	0.913	3.65	ok
RadioButton	disabled	dark	normal	95.3%	0.963	1.18	ok
RadioButton	selected	light	normal	95.3%	0.964	1.84	ok
CheckBox	selected	light	normal	95.4%	0.952	2.06	ok
Switch	selected	light	normal	95.4%	0.966	1.59	ok
Switch	selected	dark	normal	95.5%	0.966	1.86	ok
RadioButton	disabled	light	normal	95.5%	0.966	1.08	ok
Switch	disabled	dark	normal	95.6%	0.961	0.85	ok
Dialog	normal	light	normal	95.7%	0.930	2.30	ok
RaisedButton	pressed	light	normal	95.8%	0.958	2.16	ok
Button	normal	light	normal	95.8%	0.953	2.46	ok
Dialog	normal	dark	normal	95.8%	0.932	2.30	ok
Switch	normal	light	normal	96.0%	0.961	1.45	ok
FloatingActionButton	normal	light	normal	96.1%	0.937	1.14	ok
FloatingActionButton	pressed	dark	normal	96.2%	0.951	2.45	ok
Switch	normal	dark	normal	96.2%	0.962	1.39	ok
TextField	disabled	dark	normal	96.2%	0.965	0.76	ok
RaisedButton	normal	dark	normal	96.4%	0.952	1.78	ok
Switch	disabled	light	normal	96.4%	0.970	0.61	ok
Button	disabled	light	normal	96.8%	0.960	1.06	ok
ProgressBar	normal	dark	normal	96.9%	0.967	2.03	OFF (h 1.50)
RaisedButton	disabled	dark	normal	97.0%	0.955	0.89	ok
FloatingActionButton	normal	dark	normal	97.1%	0.952	1.43	ok
ProgressBar	normal	light	normal	97.3%	0.974	1.53	OFF (h 1.50)
RaisedButton	disabled	light	normal	97.3%	0.961	0.79	ok
TextField	disabled	light	normal	97.3%	0.965	0.79	ok
RaisedButton	normal	light	normal	97.3%	0.961	1.40	ok
TextField	normal	dark	normal	97.6%	0.958	1.83	ok
TextField	normal	light	normal	97.6%	0.958	1.63	ok
Slider	normal	dark	normal	98.4%	0.990	0.87	ok
Toolbar	normal	light	normal	98.7%	0.974	1.28	ok
Slider	normal	light	normal	99.0%	0.991	0.47	ok
Slider	disabled	dark	normal	99.6%	0.993	0.22	ok
Slider	disabled	light	normal	99.6%	0.993	0.18	ok

Geometry vs native (bbox offset / size ratio / center offset / corner radius) -- gated separately from the visual score

Component	State	Appearance	bbox dx,dy (px)	w ratio	h ratio	center off (px)	radius native->cn1 (px)
FloatingActionButton	pressed	light	+0,+0	0.929	0.881	4.0	-
FloatingActionButton	normal	light	+0,+0	0.946	0.912	2.9	-
Button	pressed	dark	+0,+0	0.947	0.975	2.6	-
Button	disabled	dark	+0,+0	0.947	0.975	2.6	-
Button	pressed	light	+0,+0	0.947	0.975	2.6	-
Button	normal	dark	+0,+0	0.947	0.975	2.6	-
RaisedButton	pressed	dark	+0,+0	0.945	0.975	2.6	-
RaisedButton	pressed	light	+0,+0	0.945	0.975	2.6	-
Button	normal	light	+0,+0	0.947	0.975	2.6	-
RaisedButton	normal	dark	+0,+0	0.945	0.975	2.6	-
Button	disabled	light	+0,+0	0.947	0.975	2.6	-
RaisedButton	disabled	dark	+0,+0	0.945	0.975	2.6	-
RaisedButton	disabled	light	+0,+0	0.945	0.975	2.6	-
RaisedButton	normal	light	+0,+0	0.945	0.975	2.6	-
RadioButton	normal	dark	+1,+1	1.029	1.000	2.2	-
RadioButton	normal	light	+1,+1	1.029	1.000	2.2	-
RadioButton	selected	dark	+1,+1	1.029	1.000	2.2	-
RadioButton	disabled	dark	+1,+1	1.029	1.000	2.2	-
RadioButton	selected	light	+1,+1	1.029	1.000	2.2	-
Switch	selected	light	+0,+0	1.080	1.063	2.2	-
RadioButton	disabled	light	+1,+1	1.029	1.000	2.2	-
CheckBox	selected	dark	+1,+1	1.013	1.000	1.8	-
CheckBox	normal	dark	+1,+1	1.013	1.000	1.8	-
CheckBox	normal	light	+1,+1	1.013	1.000	1.8	-
CheckBox	disabled	dark	+1,+1	1.013	1.000	1.8	-
CheckBox	disabled	light	+1,+1	1.013	1.000	1.8	-
CheckBox	selected	light	+1,+1	1.013	1.000	1.8	-
Switch	selected	dark	+0,+0	1.060	1.031	1.6	-
Switch	disabled	dark	+0,-1	1.060	1.031	1.6	-
Dialog	normal	light	+0,+0	1.007	0.982	1.6	-
Dialog	normal	dark	+0,+0	1.007	0.982	1.6	-
Switch	normal	light	+0,-1	1.060	1.031	1.6	-
Switch	normal	dark	+0,-1	1.060	1.031	1.6	-
Switch	disabled	light	+0,-1	1.060	1.031	1.6	-
FloatingActionButton	pressed	dark	+0,+0	0.963	0.963	1.4	-
FloatingActionButton	normal	dark	+0,+0	0.963	0.963	1.4	-
Toolbar	normal	light	-1,+1	1.000	1.000	1.4	-
FlatButton	pressed	dark	+0,+0	0.977	0.975	1.1	-
FlatButton	normal	dark	+0,+0	0.977	0.975	1.1	-
FlatButton	normal	light	+0,+0	0.977	0.975	1.1	-
FlatButton	pressed	light	+0,+0	0.977	0.975	1.1	-
TextField	normal	dark	+0,+0	1.015	1.036	1.1	-
TextField	normal	light	+0,+0	1.015	1.036	1.1	-
Toolbar	normal	dark	+0,+0	1.000	1.032	1.0	-
ProgressBar	normal	dark	+0,+0	1.000	1.500	1.0	-
ProgressBar	normal	light	+0,+0	1.000	1.500	1.0	-
TextField	disabled	dark	+0,+0	1.015	1.018	0.7	-
TextField	disabled	light	+0,+0	1.015	1.018	0.7	-
Tabs	normal	light	+0,+1	1.000	0.984	0.5	-
Slider	normal	dark	+1,+0	0.996	1.000	0.5	-
Slider	normal	light	+1,+0	0.996	1.000	0.5	-
Tabs	normal	dark	+0,+0	1.000	1.000	0.0	-
Slider	disabled	dark	+0,+0	1.000	1.000	0.0	-
Slider	disabled	light	+0,+0	1.000	1.000	0.0	-

Side-by-side comparisons (worst first)

FlatButton_pressed_dark -- 91.25% fidelity (SSIM 0.8985) (no change)

Left: native widget. Right: Codename One render.
Tabs_normal_light -- 92.28% fidelity (SSIM 0.9140) (no change)

Left: native widget. Right: Codename One render.
Button_pressed_dark -- 92.61% fidelity (SSIM 0.9485) (no change)

Left: native widget. Right: Codename One render.
FlatButton_normal_dark -- 93.24% fidelity (SSIM 0.9381) (no change)

Left: native widget. Right: Codename One render.
Button_disabled_dark -- 93.26% fidelity (SSIM 0.9278) (no change)

Left: native widget. Right: Codename One render.
Button_pressed_light -- 93.34% fidelity (SSIM 0.9521) (no change)

Left: native widget. Right: Codename One render.
FlatButton_normal_light -- 93.72% fidelity (SSIM 0.9410) (no change)

Left: native widget. Right: Codename One render.
FlatButton_pressed_light -- 93.77% fidelity (SSIM 0.9424) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_pressed_light -- 94.44% fidelity (SSIM 0.9273) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_dark -- 94.46% fidelity (SSIM 0.9630) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_light -- 94.69% fidelity (SSIM 0.9643) (no change)

Left: native widget. Right: Codename One render.
CheckBox_selected_dark -- 94.71% fidelity (SSIM 0.9502) (no change)

Left: native widget. Right: Codename One render.
RadioButton_selected_dark -- 94.79% fidelity (SSIM 0.9630) (no change)

Left: native widget. Right: Codename One render.
CheckBox_normal_dark -- 94.93% fidelity (SSIM 0.9516) (no change)

Left: native widget. Right: Codename One render.
Button_normal_dark -- 94.94% fidelity (SSIM 0.9491) (no change)

Left: native widget. Right: Codename One render.
CheckBox_normal_light -- 95.03% fidelity (SSIM 0.9531) (no change)

Left: native widget. Right: Codename One render.
Toolbar_normal_dark -- 95.07% fidelity (SSIM 0.9059) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_dark -- 95.19% fidelity (SSIM 0.9501) (no change)

Left: native widget. Right: Codename One render.
CheckBox_disabled_dark -- 95.20% fidelity (SSIM 0.9538) (no change)

Left: native widget. Right: Codename One render.
CheckBox_disabled_light -- 95.21% fidelity (SSIM 0.9562) (no change)

Left: native widget. Right: Codename One render.
Tabs_normal_dark -- 95.23% fidelity (SSIM 0.9125) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_dark -- 95.29% fidelity (SSIM 0.9630) (no change)

Left: native widget. Right: Codename One render.
RadioButton_selected_light -- 95.33% fidelity (SSIM 0.9642) (no change)

Left: native widget. Right: Codename One render.
CheckBox_selected_light -- 95.37% fidelity (SSIM 0.9524) (no change)

Left: native widget. Right: Codename One render.
Switch_selected_light -- 95.37% fidelity (SSIM 0.9658) (no change)

Left: native widget. Right: Codename One render.
Switch_selected_dark -- 95.45% fidelity (SSIM 0.9656) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_light -- 95.46% fidelity (SSIM 0.9657) (no change)

Left: native widget. Right: Codename One render.
Switch_disabled_dark -- 95.57% fidelity (SSIM 0.9613) (no change)

Left: native widget. Right: Codename One render.
Dialog_normal_light -- 95.65% fidelity (SSIM 0.9300) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_light -- 95.78% fidelity (SSIM 0.9578) (no change)

Left: native widget. Right: Codename One render.
Button_normal_light -- 95.79% fidelity (SSIM 0.9528) (no change)

Left: native widget. Right: Codename One render.
Dialog_normal_dark -- 95.79% fidelity (SSIM 0.9322) (no change)

Left: native widget. Right: Codename One render.
Switch_normal_light -- 95.97% fidelity (SSIM 0.9612) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_normal_light -- 96.09% fidelity (SSIM 0.9367) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_pressed_dark -- 96.16% fidelity (SSIM 0.9513) (no change)

Left: native widget. Right: Codename One render.
Switch_normal_dark -- 96.17% fidelity (SSIM 0.9616) (no change)

Left: native widget. Right: Codename One render.
TextField_disabled_dark -- 96.21% fidelity (SSIM 0.9648) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_normal_dark -- 96.41% fidelity (SSIM 0.9516) (no change)

Left: native widget. Right: Codename One render.
Switch_disabled_light -- 96.43% fidelity (SSIM 0.9698) (no change)

Left: native widget. Right: Codename One render.
Button_disabled_light -- 96.80% fidelity (SSIM 0.9596) (no change)

Left: native widget. Right: Codename One render.
ProgressBar_normal_dark -- 96.91% fidelity (SSIM 0.9669) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_dark -- 97.02% fidelity (SSIM 0.9549) (no change)

Left: native widget. Right: Codename One render.
FloatingActionButton_normal_dark -- 97.07% fidelity (SSIM 0.9521) (no change)

Left: native widget. Right: Codename One render.
ProgressBar_normal_light -- 97.26% fidelity (SSIM 0.9739) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_light -- 97.26% fidelity (SSIM 0.9611) (no change)

Left: native widget. Right: Codename One render.
TextField_disabled_light -- 97.29% fidelity (SSIM 0.9649) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_normal_light -- 97.32% fidelity (SSIM 0.9613) (no change)

Left: native widget. Right: Codename One render.
TextField_normal_dark -- 97.61% fidelity (SSIM 0.9583) (no change)

Left: native widget. Right: Codename One render.
TextField_normal_light -- 97.62% fidelity (SSIM 0.9582) (no change)

Left: native widget. Right: Codename One render.
Slider_normal_dark -- 98.39% fidelity (SSIM 0.9900) (no change)

Left: native widget. Right: Codename One render.
Toolbar_normal_light -- 98.69% fidelity (SSIM 0.9739) (no change)

Left: native widget. Right: Codename One render.
Slider_normal_light -- 98.95% fidelity (SSIM 0.9908) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_dark -- 99.56% fidelity (SSIM 0.9927) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_light -- 99.59% fidelity (SSIM 0.9932) (no change)

Left: native widget. Right: Codename One render.

… reactor; guide snippets by tag Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

github-actions · 2026-10-25T19:46:40Z

Flutter vs Codename One

Same application, built both ways: Flutter's AOT compile of the gallery, and the identical Dart source transpiled to Java on Codename One. Lower is better for every metric, so a ratio above 1.00x means Codename One is ahead by that factor.

android

9 interleaved rounds; host load 1.04, 1.92, 1.54

Metric	Codename One	Flutter	Ratio	Winner
Installed size	78.2 MB	95.8 MB	1.22x	Codename One
Executable code	4.7 MB	20.6 MB	4.41x	Codename One
Download size (zipped)	78.2 MB	95.8 MB	1.22x	Codename One
Cold start to first frame on screen	358 ms	1369 ms	4.07x	Codename One
Memory at rest	47.9 MB	89.1 MB	1.85x	Codename One

Start-up and memory at rest are judged round by round: the ratio is the median of the per-round ratios, each from two launches made back to back, and the times and sizes shown are each side's median, so the ratio need not equal their quotient. Codename One was ahead in 9 of 9 rounds on cold start to first frame on screen; 9 of 9 rounds on memory at rest.

Compute -- the VM workloads (vm/benchmarks), run inside each app; time is the best of the app's own repetitions, higher ratio means Codename One is faster.

Workload	Codename One	Flutter	Ratio
intArithmetic	95 ms	186 ms	1.96x
longArithmetic	58 ms	58 ms	1.00x
mathTranscendental	227 ms	350 ms	1.54x
arraySequential	26 ms	36 ms	1.39x
arrayRandom	262 ms	319 ms	1.22x
objectAllocation	63 ms	49 ms	0.78x
valueEscape	7 ms	7 ms	1.00x
hashMapChurn	144 ms	299 ms	2.08x
stringBuilding	94 ms	131 ms	1.39x
recursion	82 ms	273 ms	3.33x
quicksortBench	129 ms	154 ms	1.19x
Geometric mean			1.42x

Gate: within tolerance against scripts/flutter-bench/baseline.

Android sizes are for the arm64-v8a slice a phone is delivered, on both sides; Flutter's release apk carries three ABIs and would otherwise count its engine about three times.
Android start-up and memory come from an x86_64 emulator with a software GPU. They compare the two runtimes on one machine; they are not phone timings, and a renderer that leans on the GPU is penalised more there.
This platform's adapter has not been exercised end to end before; treat the first published run as the thing under review.

ios

9 interleaved rounds; host load 38.76, 39.17, 29.43

Metric	Codename One	Flutter	Ratio	Winner
Installed size	108.3 MB	110.5 MB	1.02x	Codename One
Executable code	17.3 MB	19.1 MB	1.10x	Codename One
Download size (zipped)	79.9 MB	81.9 MB	1.02x	Codename One
Cold start to first frame on screen	--	--	--	not measured
Memory at rest	--	--	--	not measured

Compute -- the VM workloads (vm/benchmarks), run inside each app; time is the best of the app's own repetitions, higher ratio means Codename One is faster.

Not measured: iOS compute is not measured: a device build needs signed hardware, and on the simulator Flutter runs its JIT debug engine rather than AOT code. The macOS row runs the same ParparVM and Dart AOT compilers on the same Apple silicon.

Gate: within tolerance against scripts/flutter-bench/baseline. Smaller than its baseline, which does not fail the gate: Executable code -6.58% -- rebaseline to tighten. To accept the move, download this platform's baseline-<platform>.json artifact and run python3 scripts/flutter-bench/flutter_baseline.py calibrate --pr 6106 --reason "<why these moved>" baseline-ios.json, then commit the overlay it writes.

iOS start-up and memory are not measured here: Flutter cannot AOT-compile for the simulator, so a simulator run would time a JIT debug build against a release build. Sizes come from release device bundles; timings need signed hardware.
This platform's adapter has not been exercised end to end before; treat the first published run as the thing under review.

javascript

9 interleaved rounds; host load 1.91, 1.24, 0.55

Metric	Codename One	Flutter	Ratio	Winner
Installed size	104.0 MB	122.5 MB	1.18x	Codename One
Executable code	12.9 MB	25.2 MB	1.95x	Codename One
Download size (zipped)	76.3 MB	84.1 MB	1.10x	Codename One
Cold start to first frame on screen	--	--	--	not measured
Memory at rest	--	--	--	not measured

Compute -- the VM workloads (vm/benchmarks), run inside each app; time is the best of the app's own repetitions, higher ratio means Codename One is faster.

Workload	Codename One	Flutter	Ratio
intArithmetic	708 ms	wrong result	Flutter: wrong result
longArithmetic	5191 ms	did not run	Flutter: did not run
mathTranscendental	580 ms	did not run	Flutter: did not run
arraySequential	244 ms	90 ms	0.37x
arrayRandom	988 ms	wrong result	Flutter: wrong result
objectAllocation	36 ms	28 ms	0.78x
valueEscape	162 ms	8 ms	0.05x
hashMapChurn	1105 ms	261 ms	0.24x
stringBuilding	480 ms	110 ms	0.23x
recursion	506 ms	513 ms	1.01x
quicksortBench	451 ms	wrong result	Flutter: wrong result
Geometric mean			0.30x

Gate: within tolerance against scripts/flutter-bench/baseline; BEHIND FLUTTER on Compute (geomean of the VM workloads) (reported, not gated: a loss to Flutter on the web is currently accepted).

the JavaScript adapter needs a Chrome DevTools driver; sizes are reported and timings are not
This platform's adapter has not been exercised end to end before; treat the first published run as the thing under review.

linux

9 interleaved rounds; host load 0.24, 2.85, 2.38

Metric	Codename One	Flutter	Ratio	Winner
Installed size	111.6 MB	143.8 MB	1.29x	Codename One
Executable code	14.0 MB	16.1 MB	1.15x	Codename One
Download size (zipped)	80.9 MB	92.9 MB	1.15x	Codename One
Cold start to first frame on screen	151 ms	231 ms	1.55x	Codename One
Memory at rest	85.0 MB	225.5 MB	2.69x	Codename One

Start-up and memory at rest are judged round by round: the ratio is the median of the per-round ratios, each from two launches made back to back, and the times and sizes shown are each side's median, so the ratio need not equal their quotient. Codename One was ahead in 9 of 9 rounds on cold start to first frame on screen; 9 of 9 rounds on memory at rest.

Compute -- the VM workloads (vm/benchmarks), run inside each app; time is the best of the app's own repetitions, higher ratio means Codename One is faster.

Workload	Codename One	Flutter	Ratio
intArithmetic	84 ms	207 ms	2.46x
longArithmetic	63 ms	65 ms	1.03x
mathTranscendental	238 ms	262 ms	1.10x
arraySequential	16 ms	39 ms	2.44x
arrayRandom	246 ms	257 ms	1.04x
objectAllocation	25 ms	36 ms	1.44x
valueEscape	5 ms	8 ms	1.60x
hashMapChurn	47 ms	340 ms	7.23x
stringBuilding	33 ms	111 ms	3.36x
recursion	82 ms	296 ms	3.61x
quicksortBench	154 ms	166 ms	1.08x
Geometric mean			1.95x

Gate: within tolerance against scripts/flutter-bench/baseline.

This platform's adapter has not been exercised end to end before; treat the first published run as the thing under review.

macos

9 interleaved rounds; host load 2.98, 20.49, 26.95

Metric	Codename One	Flutter	Ratio	Winner
Installed size	124.4 MB	139.4 MB	1.12x	Codename One
Executable code	33.3 MB	47.9 MB	1.44x	Codename One
Download size (zipped)	85.5 MB	93.3 MB	1.09x	Codename One
Cold start to first frame on screen	443 ms	542 ms	1.29x	Codename One
Memory at rest	34.7 MB	55.0 MB	1.57x	Codename One

Start-up and memory at rest are judged round by round: the ratio is the median of the per-round ratios, each from two launches made back to back, and the times and sizes shown are each side's median, so the ratio need not equal their quotient. Codename One was ahead in 8 of 9 rounds on cold start to first frame on screen; 9 of 9 rounds on memory at rest.

Compute -- the VM workloads (vm/benchmarks), run inside each app; time is the best of the app's own repetitions, higher ratio means Codename One is faster.

Workload	Codename One	Flutter	Ratio
intArithmetic	128 ms	316 ms	2.47x
longArithmetic	81 ms	83 ms	1.02x
mathTranscendental	315 ms	372 ms	1.18x
arraySequential	11 ms	47 ms	4.27x
arrayRandom	329 ms	430 ms	1.31x
objectAllocation	100 ms	55 ms	0.55x
valueEscape	6 ms	23 ms	3.83x
hashMapChurn	58 ms	300 ms	5.17x
stringBuilding	37 ms	184 ms	4.97x
recursion	174 ms	336 ms	1.93x
quicksortBench	142 ms	186 ms	1.31x
Geometric mean			2.02x

Gate: within tolerance against scripts/flutter-bench/baseline. Smaller than its baseline, which does not fail the gate: Executable code -5.72% -- rebaseline to tighten. To accept the move, download this platform's baseline-<platform>.json artifact and run python3 scripts/flutter-bench/flutter_baseline.py calibrate --pr 6106 --reason "<why these moved>" baseline-macos.json, then commit the overlay it writes.

This platform's adapter has not been exercised end to end before; treat the first published run as the thing under review.

windows

9 interleaved rounds

Metric	Codename One	Flutter	Ratio	Winner
Installed size	107.9 MB	121.1 MB	1.12x	Codename One
Executable code	11.3 MB	14.1 MB	1.25x	Codename One
Download size (zipped)	77.9 MB	86.4 MB	1.11x	Codename One
Cold start to first frame on screen	157 ms	249 ms	1.58x	Codename One
Memory at rest	56.2 MB	92.5 MB	1.65x	Codename One

Start-up and memory at rest are judged round by round: the ratio is the median of the per-round ratios, each from two launches made back to back, and the times and sizes shown are each side's median, so the ratio need not equal their quotient. Codename One was ahead in 9 of 9 rounds on cold start to first frame on screen; 9 of 9 rounds on memory at rest.

Compute -- the VM workloads (vm/benchmarks), run inside each app; time is the best of the app's own repetitions, higher ratio means Codename One is faster.

Workload	Codename One	Flutter	Ratio
intArithmetic	81 ms	184 ms	2.27x
longArithmetic	64 ms	57 ms	0.89x
mathTranscendental	198 ms	267 ms	1.35x
arraySequential	12 ms	35 ms	2.92x
arrayRandom	243 ms	311 ms	1.28x
objectAllocation	24 ms	39 ms	1.62x
valueEscape	1 ms	7 ms	7.00x
hashMapChurn	47 ms	316 ms	6.72x
stringBuilding	35 ms	123 ms	3.51x
recursion	195 ms	264 ms	1.35x
quicksortBench	139 ms	146 ms	1.05x
Geometric mean			2.12x

Gate: within tolerance against scripts/flutter-bench/baseline. Smaller than its baseline, which does not fail the gate: Executable code -11.03%; Download size (zipped) -0.78% -- rebaseline to tighten. To accept the move, download this platform's baseline-<platform>.json artifact and run python3 scripts/flutter-bench/flutter_baseline.py calibrate --pr 6106 --reason "<why these moved>" baseline-windows.json, then commit the overlay it writes.

This platform's adapter has not been exercised end to end before; treat the first published run as the thing under review.

Codename One wins 26 of 26 measured metrics across 6 platform(s).

github-actions · 2026-10-25T20:32:48Z

✅ Continuous Quality Report

Test & Coverage

✅ Tests: 14629 total, 0 failed, 161 skipped
📊 Line coverage: 65.01% [HTML preview] [Download]
- Lowest covered classes
  - com.codename1.io.zip.ZipArchiveOutputStream – 0.00%
  - com.codename1.gaming.level.GameSceneView – 0.00%
  - com.codename1.crash.CrashProtection – 0.00%
  - com.codename1.mapping.JsonValues – 0.00%
  - com.codename1.payment.CommerceManager – 0.00%
  - com.codename1.wearable.WearableMessage – 0.00%
  - com.codename1.ui.plaf.GlassLensBlend – 0.00%
  - com.codename1.vr.VRView – 0.00%
  - com.codename1.appreview.RatingDialog – 0.00%
  - com.codename1.db.ManagedKeys – 0.00%

Static Analysis

SpotBugs [Report archive]
- ✅ ByteCodeTranslator: 0 findings (no issues)
- ✅ android: 0 findings (no issues)
- ✅ android-compat: 0 findings (no issues)
- ✅ android-res-compiler: 0 findings (no issues)
- ✅ backend: 0 findings (no issues)
- ✅ backend-test: 0 findings (no issues)
- ✅ build-engine: 0 findings (no issues)
- ✅ build-hint-catalog: 0 findings (no issues)
- ✅ build-hint-tools: 0 findings (no issues)
- ✅ codenameone-gradle-plugin: 0 findings (no issues)
- ✅ codenameone-maven-plugin: 0 findings (no issues)
- ✅ compose-compat: 0 findings (no issues)
- ✅ core-unittests: 0 findings (no issues)
- ✅ desktop-compat-runtime: 0 findings (no issues)
- ✅ fxml-compiler: 0 findings (no issues)
- ✅ ios: 0 findings (no issues)
- ✅ javac: 0 findings (no issues)
- ✅ javafx-compat: 0 findings (no issues)
- ✅ project-model: 0 findings (no issues)
- ✅ swing-compat: 0 findings (no issues)
❌ PMD: 1 findings (P3: 1) [HTML preview] [Download]
- Top findings
  - P3: vm/backend/test/src/com/codename1/backend/test/OtlpTestCollector.java:54 – Do not hard code the IP address (rule: AvoidUsingHardCodedIP)
✅ Checkstyle: 0 findings (no issues) [Report archive]

Generated automatically by the PR CI workflow.

shai-almog · 2026-10-25T21:10:24Z

Native fidelity (ios-27-metal)

68 pairs compared -- median 94.6%, worst 74.5% (Toolbar_normal_dark), 25th pct 91.7%, mean 93.3%.

Distribution -- >=99%: 0 | 95-99%: 31 | 90-95%: 25 | <90%: 12

Component	State	Appearance	Material	Fidelity	SSIM	mean delta	vs base	Geometry
Toolbar	normal	dark	glass	74.5%	0.930	7.16	0.0	ok
Button	normal	dark	glass	79.3%	0.938	7.66	0.0	OFF (off 11px)
Button	disabled	dark	glass	79.6%	0.942	7.41	0.0	OFF (off 11px)
RaisedButton	disabled	dark	glass	81.2%	0.954	6.32	0.0	ok
Tabs	normal	dark	glass	86.2%	0.900	6.73	+0.3	ok
Button	pressed	dark	glass	86.3%	0.948	5.27	0.0	OFF (off 11px)
Tabs	normal	light	glass	86.4%	0.895	7.61	+0.3	ok
TextField	normal	light	normal	86.5%	0.950	3.38	0.0	ok
Toolbar	normal	light	glass	86.9%	0.949	3.85	0.0	ok
TextField	disabled	light	normal	89.4%	0.954	2.56	0.0	ok
Button	normal	light	glass	89.5%	0.959	4.54	0.0	OFF (off 11px)
Button	pressed	light	glass	89.5%	0.959	4.33	0.0	OFF (off 11px)
Spinner	normal	dark	normal	90.7%	0.880	3.47	0.0	ok
FlatButton	normal	dark	glass	90.9%	0.981	2.38	0.0	ok
Button	disabled	light	glass	91.6%	0.962	3.21	0.0	OFF (off 11px)
Spinner	normal	light	normal	91.6%	0.910	4.20	0.0	ok
CheckBox	normal	light	normal	91.7%	0.994	0.72	0.0	ok
RadioButton	normal	light	normal	91.7%	0.994	0.72	0.0	ok
Slider	disabled	dark	normal	92.1%	0.943	2.45	0.0	ok
Switch	selected	light	normal	92.1%	0.981	1.47	0.0	ok
CheckBox	disabled	light	normal	92.3%	0.995	0.52	0.0	ok
RadioButton	disabled	light	normal	92.3%	0.995	0.52	0.0	ok
FlatButton	pressed	dark	glass	92.4%	0.982	1.37	0.0	ok
RaisedButton	disabled	light	glass	92.4%	0.960	2.43	0.0	ok
Slider	normal	dark	normal	92.5%	0.944	2.63	0.0	ok
TabsGeom	normal	light	normal	93.1%	0.885	6.48	+0.1	OFF (off 6px)
FlatButton	pressed	light	glass	93.3%	0.981	1.90	0.0	ok
TabsGeom	normal	dark	normal	93.8%	0.893	4.47	+0.1	ok
FlatButton	normal	light	glass	93.9%	0.981	1.88	0.0	ok
Slider	disabled	light	normal	94.0%	0.963	1.75	0.0	OFF (h 4.50)
RaisedButton	pressed	dark	glass	94.1%	0.966	2.29	0.0	ok
RaisedButton	normal	dark	glass	94.1%	0.966	2.32	0.0	ok
RadioButton	selected	light	normal	94.3%	0.990	0.95	0.0	ok
RaisedButton	pressed	light	glass	94.5%	0.963	2.16	0.0	ok
GlassPanelPhoto	normal	dark	glass	94.6%	0.951	13.16	0.0	ok
RaisedButton	normal	light	glass	94.6%	0.963	2.17	0.0	ok
GlassPanelPhoto	normal	light	glass	94.7%	0.951	11.57	0.0	ok
Slider	normal	light	normal	95.1%	0.959	1.56	0.0	ok
CheckBox	disabled	dark	normal	95.4%	0.992	0.25	0.0	ok
RadioButton	disabled	dark	normal	95.4%	0.992	0.25	0.0	ok
Switch	normal	light	normal	95.5%	0.986	0.70	0.0	ok
CheckBox	selected	light	normal	95.8%	0.995	0.65	0.0	ok
CheckBox	normal	dark	normal	95.8%	0.992	0.39	0.0	ok
RadioButton	normal	dark	normal	95.8%	0.992	0.39	0.0	ok
Switch	selected	dark	normal	95.9%	0.985	1.02	0.0	ok
TextField	normal	dark	normal	96.0%	0.937	4.53	0.0	ok
RadioButton	selected	dark	normal	96.1%	0.989	0.67	0.0	ok
Switch	disabled	light	normal	96.4%	0.990	0.53	0.0	ok
TextField	disabled	dark	normal	96.4%	0.940	3.39	0.0	ok
Switch	normal	dark	normal	96.8%	0.986	0.82	0.0	ok
TabOne	normal	light	normal	96.9%	0.948	2.57	0.0	OFF (off 6px, w 0.86)
GlassIcon	normal	dark	normal	97.2%	0.955	3.32	0.0	ok
GlassText	normal	dark	normal	97.3%	0.956	3.27	+0.1	ok
GlassPanelGrey	normal	dark	normal	97.4%	0.959	3.41	0.0	ok
TabOne	normal	dark	normal	97.4%	0.953	1.49	0.0	OFF (w 0.86)
ProgressBar	normal	dark	normal	97.5%	0.997	0.60	0.0	ok
ProgressBar	normal	light	normal	97.6%	0.999	0.61	0.0	ok
GlassPanelRed	normal	dark	normal	97.7%	0.980	6.75	0.0	ok
CheckBox	selected	dark	normal	97.9%	0.995	0.37	0.0	ok
Dialog	normal	dark	normal	97.9%	0.961	1.38	0.0	ok
GlassPanelGrad	normal	dark	normal	97.9%	0.975	4.86	0.0	ok
Dialog	normal	light	normal	98.0%	0.963	1.42	0.0	ok
Switch	disabled	dark	normal	98.0%	0.987	0.41	0.0	ok
GlassIcon	normal	light	normal	98.2%	0.975	3.65	0.0	ok
GlassText	normal	light	normal	98.3%	0.978	3.58	+0.1	ok
GlassPanelGrad	normal	light	normal	98.4%	0.988	5.52	0.0	ok
GlassPanelGrey	normal	light	normal	98.7%	0.987	3.64	0.0	ok
GlassPanelRed	normal	light	normal	98.8%	0.990	4.14	0.0	ok

Geometry vs native (bbox offset / size ratio / center offset / corner radius) -- gated separately from the visual score

Component	State	Appearance	bbox dx,dy (px)	w ratio	h ratio	center off (px)	radius native->cn1 (px)
Button	normal	dark	+0,-6	1.094	1.067	10.9	90.5 -> 45.2
Button	disabled	dark	+0,-6	1.094	1.067	10.9	92.0 -> 45.2
Button	pressed	dark	+0,-6	1.094	1.080	10.8	79.4 -> 45.3
Button	normal	light	+0,+0	1.094	1.000	10.5	45.7 -> 45.3
Button	pressed	light	+0,+0	1.094	1.000	10.5	87.5 -> 45.4
Button	disabled	light	+0,+0	1.094	1.000	10.5	49.1 -> 45.3
TabsGeom	normal	light	+3,+0	0.990	1.069	6.1	79.8 -> 83.6
TabOne	normal	light	+19,+0	0.863	1.069	6.1	80.9 -> 83.6
TabsGeom	normal	dark	+3,+0	0.990	1.064	5.6	98.6 -> 99.1
TabOne	normal	dark	+19,+0	0.863	1.064	5.6	95.2 -> 95.6
Tabs	normal	light	+4,+0	0.988	1.064	5.5	85.9 -> 87.9
GlassIcon	normal	dark	+1,+8	0.998	0.976	5.5	102.3 -> 102.4
GlassText	normal	dark	+1,+8	0.998	0.976	5.5	102.3 -> 102.4
Tabs	normal	dark	+4,+0	0.987	1.058	5.1	92.9 -> 93.7
Toolbar	normal	dark	+6,-3	0.983	1.009	3.5	90.3 -> 55.5
Toolbar	normal	light	+6,+7	0.984	0.926	3.2	70.9 -> 56.1
RaisedButton	disabled	dark	+0,-6	1.009	1.079	2.7	89.6 -> 46.1
Switch	selected	light	+0,+0	1.028	1.026	2.7	-
Slider	disabled	light	+0,-29	1.000	4.500	2.5	-
Switch	normal	light	+0,+0	1.023	1.013	2.1	-
Switch	disabled	light	+0,+0	1.023	1.013	2.1	-
Switch	normal	dark	+0,+0	1.023	1.013	2.1	-
Switch	disabled	dark	+0,+0	1.023	1.013	2.1	-
Spinner	normal	light	+11,-8	0.978	1.052	1.6	-
RaisedButton	disabled	light	+0,+0	1.014	1.011	1.6	71.9 -> 96.6
FlatButton	normal	light	+0,+0	0.980	1.011	1.6	86.2 -> 51.8
Switch	selected	dark	+0,+0	1.017	1.013	1.6	-
Spinner	normal	dark	+12,-8	0.977	1.052	1.5	-
CheckBox	normal	light	+0,+0	0.977	0.977	1.4	-
RadioButton	normal	light	+0,+0	0.977	0.977	1.4	-
RadioButton	selected	light	+0,+0	0.977	0.977	1.4	-
CheckBox	selected	light	+0,+0	0.977	0.977	1.4	-
CheckBox	normal	dark	+0,+0	0.977	0.977	1.4	-
RadioButton	normal	dark	+0,+0	0.977	0.977	1.4	-
RadioButton	selected	dark	+0,+0	0.977	0.977	1.4	-
CheckBox	selected	dark	+0,+0	0.977	0.977	1.4	-
FlatButton	pressed	light	+1,+0	0.973	1.011	1.1	94.6 -> 65.6
RaisedButton	pressed	dark	+0,+0	1.009	1.011	1.1	44.6 -> 44.3
RaisedButton	normal	dark	+0,+0	1.009	1.011	1.1	44.5 -> 44.3
CheckBox	disabled	dark	+1,+0	0.966	0.977	1.1	-
RadioButton	disabled	dark	+1,+0	0.966	0.977	1.1	-
RaisedButton	pressed	light	+0,+0	1.009	1.000	1.0	43.3 -> 44.3
RaisedButton	normal	light	+0,+0	1.009	1.000	1.0	43.3 -> 44.1
FlatButton	normal	dark	+4,+0	0.952	1.011	0.7	86.1 -> 95.7
FlatButton	pressed	dark	+4,+0	0.952	1.011	0.7	94.7 -> 97.9
GlassPanelPhoto	normal	light	+1,+1	0.997	0.995	0.7	35.1 -> 33.5
GlassPanelGrey	normal	light	+1,+1	0.997	0.995	0.7	30.0 -> 27.4
Slider	disabled	dark	+0,-1	1.000	1.015	0.5	-
CheckBox	disabled	light	+1,+0	0.977	0.988	0.5	-
RadioButton	disabled	light	+1,+0	0.977	0.988	0.5	-
Slider	normal	light	+0,+1	1.000	0.964	0.5	-
GlassPanelGrey	normal	dark	+1,+2	0.998	0.986	0.5	101.8 -> 102.4
ProgressBar	normal	dark	+0,+0	1.000	0.900	0.5	-
ProgressBar	normal	light	+0,+0	1.000	0.900	0.5	-
GlassPanelGrad	normal	dark	+1,+0	0.998	0.995	0.5	102.0 -> 102.1
GlassIcon	normal	light	+1,+0	0.998	1.005	0.5	91.7 -> 92.8
GlassText	normal	light	+1,+0	0.998	1.005	0.5	91.7 -> 92.8
GlassPanelGrad	normal	light	+1,+0	0.998	1.005	0.5	24.3 -> 26.8
GlassPanelRed	normal	light	+1,+0	0.998	1.005	0.5	24.4 -> 25.7
TextField	normal	light	+0,+0	1.000	1.000	0.0	13.4 -> 40.0
TextField	disabled	light	+0,+0	1.000	1.000	0.0	13.9 -> 40.4
Slider	normal	dark	+0,+0	1.000	1.000	0.0	-
GlassPanelPhoto	normal	dark	+2,+1	0.996	0.991	0.0	67.3 -> 67.5
TextField	normal	dark	+0,+0	1.000	1.000	0.0	6.4 -> 15.1
TextField	disabled	dark	+0,+0	1.000	1.000	0.0	6.4 -> 15.9
GlassPanelRed	normal	dark	+1,-2	0.998	1.020	0.0	102.2 -> 102.5
Dialog	normal	dark	+0,+0	1.000	1.000	0.0	-
Dialog	normal	light	+0,+0	1.000	1.000	0.0	-

Side-by-side comparisons (worst first)

Toolbar_normal_dark -- 74.49% fidelity (SSIM 0.9295) (no change)

Left: native widget. Right: Codename One render.
Button_normal_dark -- 79.28% fidelity (SSIM 0.9380) (no change)

Left: native widget. Right: Codename One render.
Button_disabled_dark -- 79.63% fidelity (SSIM 0.9423) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_dark -- 81.15% fidelity (SSIM 0.9544) (no change)

Left: native widget. Right: Codename One render.
Tabs_normal_dark -- 86.22% fidelity (SSIM 0.8999) (+0.33 vs baseline)

Left: native widget. Right: Codename One render.
Button_pressed_dark -- 86.28% fidelity (SSIM 0.9483) (no change)

Left: native widget. Right: Codename One render.
Tabs_normal_light -- 86.43% fidelity (SSIM 0.8954) (+0.31 vs baseline)

Left: native widget. Right: Codename One render.
TextField_normal_light -- 86.49% fidelity (SSIM 0.9502) (no change)

Left: native widget. Right: Codename One render.
Toolbar_normal_light -- 86.94% fidelity (SSIM 0.9488) (no change)

Left: native widget. Right: Codename One render.
TextField_disabled_light -- 89.39% fidelity (SSIM 0.9540) (no change)

Left: native widget. Right: Codename One render.
Button_normal_light -- 89.45% fidelity (SSIM 0.9588) (no change)

Left: native widget. Right: Codename One render.
Button_pressed_light -- 89.45% fidelity (SSIM 0.9588) (no change)

Left: native widget. Right: Codename One render.
Spinner_normal_dark -- 90.72% fidelity (SSIM 0.8800) (no change)

Left: native widget. Right: Codename One render.
FlatButton_normal_dark -- 90.88% fidelity (SSIM 0.9805) (no change)

Left: native widget. Right: Codename One render.
Button_disabled_light -- 91.57% fidelity (SSIM 0.9621) (no change)

Left: native widget. Right: Codename One render.
Spinner_normal_light -- 91.58% fidelity (SSIM 0.9097) (no change)

Left: native widget. Right: Codename One render.
CheckBox_normal_light -- 91.66% fidelity (SSIM 0.9935) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_light -- 91.66% fidelity (SSIM 0.9935) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_dark -- 92.13% fidelity (SSIM 0.9434) (no change)

Left: native widget. Right: Codename One render.
Switch_selected_light -- 92.13% fidelity (SSIM 0.9806) (no change)

Left: native widget. Right: Codename One render.
CheckBox_disabled_light -- 92.31% fidelity (SSIM 0.9948) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_light -- 92.31% fidelity (SSIM 0.9948) (no change)

Left: native widget. Right: Codename One render.
FlatButton_pressed_dark -- 92.38% fidelity (SSIM 0.9821) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_light -- 92.40% fidelity (SSIM 0.9596) (no change)

Left: native widget. Right: Codename One render.
Slider_normal_dark -- 92.52% fidelity (SSIM 0.9441) (no change)

Left: native widget. Right: Codename One render.
TabsGeom_normal_light -- 93.13% fidelity (SSIM 0.8851) (+0.14 vs baseline)

Left: native widget. Right: Codename One render.
FlatButton_pressed_light -- 93.29% fidelity (SSIM 0.9811) (no change)

Left: native widget. Right: Codename One render.
TabsGeom_normal_dark -- 93.81% fidelity (SSIM 0.8925) (+0.14 vs baseline)

Left: native widget. Right: Codename One render.
FlatButton_normal_light -- 93.91% fidelity (SSIM 0.9811) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_light -- 93.96% fidelity (SSIM 0.9625) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_dark -- 94.08% fidelity (SSIM 0.9659) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_normal_dark -- 94.13% fidelity (SSIM 0.9660) (no change)

Left: native widget. Right: Codename One render.
RadioButton_selected_light -- 94.26% fidelity (SSIM 0.9903) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_light -- 94.53% fidelity (SSIM 0.9633) (no change)

Left: native widget. Right: Codename One render.
GlassPanelPhoto_normal_dark -- 94.60% fidelity (SSIM 0.9505) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_normal_light -- 94.64% fidelity (SSIM 0.9632) (no change)

Left: native widget. Right: Codename One render.
GlassPanelPhoto_normal_light -- 94.66% fidelity (SSIM 0.9507) (no change)

Left: native widget. Right: Codename One render.
Slider_normal_light -- 95.09% fidelity (SSIM 0.9588) (no change)

Left: native widget. Right: Codename One render.
CheckBox_disabled_dark -- 95.41% fidelity (SSIM 0.9924) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_dark -- 95.41% fidelity (SSIM 0.9924) (no change)

Left: native widget. Right: Codename One render.
Switch_normal_light -- 95.51% fidelity (SSIM 0.9863) (no change)

Left: native widget. Right: Codename One render.
CheckBox_selected_light -- 95.80% fidelity (SSIM 0.9951) (no change)

Left: native widget. Right: Codename One render.
CheckBox_normal_dark -- 95.84% fidelity (SSIM 0.9922) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_dark -- 95.84% fidelity (SSIM 0.9922) (no change)

Left: native widget. Right: Codename One render.
Switch_selected_dark -- 95.90% fidelity (SSIM 0.9850) (no change)

Left: native widget. Right: Codename One render.
TextField_normal_dark -- 96.00% fidelity (SSIM 0.9370) (no change)

Left: native widget. Right: Codename One render.
RadioButton_selected_dark -- 96.13% fidelity (SSIM 0.9894) (no change)

Left: native widget. Right: Codename One render.
Switch_disabled_light -- 96.35% fidelity (SSIM 0.9896) (no change)

Left: native widget. Right: Codename One render.
TextField_disabled_dark -- 96.35% fidelity (SSIM 0.9395) (no change)

Left: native widget. Right: Codename One render.
Switch_normal_dark -- 96.80% fidelity (SSIM 0.9855) (no change)

Left: native widget. Right: Codename One render.
TabOne_normal_light -- 96.90% fidelity (SSIM 0.9480) (no change)

Left: native widget. Right: Codename One render.
GlassIcon_normal_dark -- 97.18% fidelity (SSIM 0.9547) (no change)

Left: native widget. Right: Codename One render.
GlassText_normal_dark -- 97.27% fidelity (SSIM 0.9563) (+0.06 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelGrey_normal_dark -- 97.35% fidelity (SSIM 0.9588) (no change)

Left: native widget. Right: Codename One render.
TabOne_normal_dark -- 97.36% fidelity (SSIM 0.9531) (no change)

Left: native widget. Right: Codename One render.
ProgressBar_normal_dark -- 97.47% fidelity (SSIM 0.9973) (no change)

Left: native widget. Right: Codename One render.
ProgressBar_normal_light -- 97.60% fidelity (SSIM 0.9989) (no change)

Left: native widget. Right: Codename One render.
GlassPanelRed_normal_dark -- 97.73% fidelity (SSIM 0.9795) (no change)

Left: native widget. Right: Codename One render.
CheckBox_selected_dark -- 97.85% fidelity (SSIM 0.9945) (no change)

Left: native widget. Right: Codename One render.
Dialog_normal_dark -- 97.86% fidelity (SSIM 0.9614) (no change)

Left: native widget. Right: Codename One render.
GlassPanelGrad_normal_dark -- 97.91% fidelity (SSIM 0.9752) (no change)

Left: native widget. Right: Codename One render.
Dialog_normal_light -- 97.95% fidelity (SSIM 0.9634) (no change)

Left: native widget. Right: Codename One render.
Switch_disabled_dark -- 98.01% fidelity (SSIM 0.9869) (no change)

Left: native widget. Right: Codename One render.
GlassIcon_normal_light -- 98.16% fidelity (SSIM 0.9750) (no change)

Left: native widget. Right: Codename One render.
GlassText_normal_light -- 98.31% fidelity (SSIM 0.9779) (+0.06 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelGrad_normal_light -- 98.41% fidelity (SSIM 0.9876) (no change)

Left: native widget. Right: Codename One render.
GlassPanelGrey_normal_light -- 98.70% fidelity (SSIM 0.9865) (no change)

Left: native widget. Right: Codename One render.
GlassPanelRed_normal_light -- 98.78% fidelity (SSIM 0.9900) (no change)

Left: native widget. Right: Codename One render.

…ndroid duplicate classes, guide snippets, mac goldens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…'s coroutines version Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog · 2026-10-26T03:06:37Z

Native fidelity (iOS Modern, Metal)

68 pairs compared -- median 95.0%, worst 83.5% (Tabs_normal_dark), 25th pct 92.5%, mean 94.6%.

Distribution -- >=99%: 3 | 95-99%: 31 | 90-95%: 29 | <90%: 5

Component	State	Appearance	Material	Fidelity	SSIM	mean delta	vs base	Geometry
Tabs	normal	dark	glass	83.5%	0.884	11.66	0.0	ok
Tabs	normal	light	glass	86.4%	0.896	8.00	0.0	ok
Toolbar	normal	light	glass	87.6%	0.951	4.24	0.0	ok
Toolbar	normal	dark	glass	87.7%	0.950	3.69	0.0	ok
Button	pressed	dark	glass	89.9%	0.958	4.21	0.0	OFF (off 12px, w 1.10)
TextField	normal	light	normal	90.0%	0.958	2.78	-0.4	ok
Spinner	normal	dark	normal	90.8%	0.881	3.39	-0.7	ok
TextField	disabled	light	normal	91.1%	0.962	2.24	-0.2	ok
Spinner	normal	light	normal	91.6%	0.910	4.11	-0.2	ok
RaisedButton	disabled	light	glass	91.8%	0.961	3.09	+0.2	ok
Button	normal	dark	glass	91.8%	0.958	3.52	0.0	OFF (off 12px, w 1.10)
Slider	disabled	dark	normal	92.1%	0.943	2.45	-0.3	ok
Switch	selected	light	normal	92.1%	0.981	1.47	0.0	ok
CheckBox	normal	light	normal	92.2%	0.994	0.68	0.0	ok
RadioButton	normal	light	normal	92.2%	0.994	0.68	0.0	ok
FlatButton	normal	dark	glass	92.2%	0.983	2.21	+4.3	ok
Button	normal	light	glass	92.4%	0.961	3.65	0.0	OFF (off 12px, w 1.10)
Slider	normal	dark	normal	92.5%	0.944	2.63	-0.2	ok
RaisedButton	disabled	dark	glass	92.7%	0.965	2.72	+1.3	ok
CheckBox	disabled	light	normal	92.7%	0.995	0.50	0.0	ok
RadioButton	disabled	light	normal	92.7%	0.995	0.50	0.0	ok
Button	pressed	light	glass	92.9%	0.962	3.29	0.0	OFF (off 12px, w 1.10)
FlatButton	pressed	dark	glass	92.9%	0.985	1.26	+2.3	ok
TabsGeom	normal	dark	normal	93.0%	0.892	8.75	0.0	ok
TabsGeom	normal	light	normal	93.0%	0.886	7.09	0.0	ok
FlatButton	pressed	light	glass	93.2%	0.982	1.90	+4.3	ok
Button	disabled	dark	glass	93.5%	0.962	2.47	0.0	OFF (off 12px, w 1.10)
Slider	disabled	light	normal	94.0%	0.963	1.75	-0.1	OFF (h 4.50)
FlatButton	normal	light	glass	94.2%	0.983	1.79	+1.3	ok
Button	disabled	light	glass	94.4%	0.964	2.36	0.0	OFF (off 12px, w 1.10)
RaisedButton	pressed	dark	glass	94.6%	0.965	2.07	+1.5	ok
RaisedButton	normal	dark	glass	94.6%	0.966	2.08	+1.7	ok
RaisedButton	pressed	light	glass	94.8%	0.967	2.22	+2.0	ok
RadioButton	selected	light	normal	94.8%	0.992	0.86	0.0	ok
RaisedButton	normal	light	glass	95.0%	0.967	2.19	+2.4	ok
Slider	normal	light	normal	95.1%	0.959	1.56	0.0	ok
Switch	normal	light	normal	95.5%	0.986	0.70	0.0	ok
CheckBox	disabled	dark	normal	95.8%	0.993	0.25	0.0	ok
RadioButton	disabled	dark	normal	95.8%	0.993	0.25	0.0	ok
CheckBox	selected	light	normal	95.8%	0.994	0.67	0.0	ok
Switch	selected	dark	normal	95.9%	0.985	1.02	0.0	ok
Switch	disabled	light	normal	96.4%	0.990	0.53	0.0	ok
CheckBox	normal	dark	normal	96.5%	0.993	0.35	0.0	ok
RadioButton	normal	dark	normal	96.5%	0.993	0.35	0.0	ok
GlassPanelPhoto	normal	light	glass	96.7%	0.980	7.95	+0.6	ok
GlassPanelPhoto	normal	dark	glass	96.8%	0.983	8.78	+0.6	ok
TabOne	normal	dark	normal	96.8%	0.953	4.44	+0.7	ok
Switch	normal	dark	normal	96.8%	0.986	0.82	0.0	ok
RadioButton	selected	dark	normal	96.8%	0.991	0.57	0.0	ok
TextField	normal	dark	normal	96.9%	0.949	3.30	-0.2	ok
TextField	disabled	dark	normal	97.2%	0.953	2.37	-0.2	ok
ProgressBar	normal	dark	normal	97.5%	0.997	0.60	+3.0	ok
TabOne	normal	light	normal	97.5%	0.961	2.90	+1.9	ok
ProgressBar	normal	light	normal	97.6%	0.999	0.61	+2.2	ok
CheckBox	selected	dark	normal	97.8%	0.993	0.38	0.0	ok
Dialog	normal	dark	normal	97.9%	0.961	1.38	+0.9	ok
Dialog	normal	light	normal	98.0%	0.963	1.42	+0.9	ok
Switch	disabled	dark	normal	98.0%	0.987	0.41	+2.5	ok
GlassIcon	normal	dark	normal	98.6%	0.984	3.55	0.0	ok
GlassText	normal	dark	normal	98.6%	0.985	3.48	0.0	ok
GlassIcon	normal	light	normal	98.7%	0.986	3.54	0.0	ok
GlassText	normal	light	normal	98.7%	0.987	3.54	0.0	ok
GlassPanelGrad	normal	light	normal	98.9%	0.994	4.38	+0.7	ok
GlassPanelGrad	normal	dark	normal	99.0%	0.993	3.84	+0.5	ok
GlassPanelGrey	normal	dark	normal	99.0%	0.992	3.30	+0.6	ok
GlassPanelGrey	normal	light	normal	99.1%	0.994	3.29	+0.7	ok
GlassPanelRed	normal	dark	normal	99.1%	0.993	3.22	+0.5	ok
GlassPanelRed	normal	light	normal	99.1%	0.994	3.49	+0.7	ok

Geometry vs native (bbox offset / size ratio / center offset / corner radius) -- gated separately from the visual score

Component	State	Appearance	bbox dx,dy (px)	w ratio	h ratio	center off (px)	radius native->cn1 (px)
Button	pressed	dark	+0,+0	1.104	1.000	11.5	45.4 -> 45.3
Button	normal	dark	+0,+0	1.104	1.000	11.5	45.8 -> 45.2
Button	normal	light	+0,+0	1.104	1.000	11.5	44.5 -> 45.3
Button	pressed	light	+0,+0	1.104	1.000	11.5	48.1 -> 45.4
Button	disabled	dark	+0,+0	1.104	1.000	11.5	45.1 -> 45.2
Button	disabled	light	+0,+0	1.104	1.000	11.5	44.0 -> 45.3
TabOne	normal	dark	-3,+0	1.007	0.948	4.9	80.3 -> 77.3
TabOne	normal	light	-3,+0	1.007	0.948	4.9	79.1 -> 77.0
Toolbar	normal	light	+4,+7	0.987	0.926	3.5	62.5 -> 56.1
Toolbar	normal	dark	+4,+7	0.987	0.919	3.2	60.5 -> 55.5
Switch	selected	light	+0,+0	1.028	1.026	2.7	-
RaisedButton	disabled	dark	+0,+0	1.024	1.011	2.6	49.8 -> 46.1
Slider	disabled	light	+0,-29	1.000	4.500	2.5	-
CheckBox	disabled	light	+1,-3	1.000	1.023	2.2	-
RadioButton	disabled	light	+1,-3	1.000	1.023	2.2	-
CheckBox	disabled	dark	+1,-3	1.000	1.023	2.2	-
RadioButton	disabled	dark	+1,-3	1.000	1.023	2.2	-
RaisedButton	disabled	light	+0,+0	1.019	1.011	2.1	54.1 -> 96.6
RaisedButton	pressed	dark	+0,+0	1.019	1.011	2.1	44.5 -> 44.3
RaisedButton	normal	dark	+0,+0	1.019	1.011	2.1	44.4 -> 44.3
RaisedButton	pressed	light	+0,+0	1.019	1.011	2.1	44.7 -> 44.3
RaisedButton	normal	light	+0,+0	1.019	1.011	2.1	44.5 -> 44.1
Switch	normal	light	+0,+0	1.023	1.013	2.1	-
Switch	disabled	light	+0,+0	1.023	1.013	2.1	-
Switch	normal	dark	+0,+0	1.023	1.013	2.1	-
Switch	disabled	dark	+0,+0	1.023	1.013	2.1	-
CheckBox	normal	dark	+0,-2	1.000	1.000	2.0	-
RadioButton	normal	dark	+0,-2	1.000	1.000	2.0	-
RadioButton	selected	dark	+0,-2	1.000	1.000	2.0	-
CheckBox	selected	dark	+0,-2	1.000	1.000	2.0	-
Tabs	normal	dark	+9,+0	0.973	1.012	1.8	79.7 -> 80.7
Tabs	normal	light	+9,+0	0.973	1.012	1.8	79.2 -> 80.3
TabsGeom	normal	dark	+9,+0	0.973	1.012	1.8	80.5 -> 80.9
TabsGeom	normal	light	+9,+0	0.973	1.012	1.8	79.3 -> 80.6
FlatButton	normal	dark	+4,+0	0.966	1.011	1.6	91.8 -> 95.7
FlatButton	pressed	dark	+4,+0	0.966	1.011	1.6	95.3 -> 97.9
Switch	selected	dark	+0,+0	1.017	1.013	1.6	-
CheckBox	normal	light	+0,-2	1.000	1.011	1.5	-
RadioButton	normal	light	+0,-2	1.000	1.011	1.5	-
RadioButton	selected	light	+0,-2	1.000	1.011	1.5	-
CheckBox	selected	light	+0,-2	1.000	1.011	1.5	-
Spinner	normal	light	+11,-9	0.978	1.055	1.1	-
GlassIcon	normal	dark	+0,+1	0.999	1.000	1.1	92.1 -> 91.5
GlassText	normal	dark	+0,+1	0.999	1.000	1.1	92.1 -> 91.5
Spinner	normal	dark	+12,-9	0.977	1.055	1.0	-
GlassPanelGrey	normal	dark	+0,+1	1.000	1.000	1.0	26.4 -> 26.9
TextField	disabled	light	+0,+1	0.999	0.996	0.7	13.9 -> 38.7
FlatButton	normal	light	+0,+0	0.993	1.011	0.7	91.9 -> 51.8
Slider	disabled	dark	+0,-1	1.000	1.015	0.5	-
FlatButton	pressed	light	+1,+0	0.986	1.011	0.5	95.4 -> 65.6
Slider	normal	light	+0,+1	1.000	0.964	0.5	-
GlassPanelPhoto	normal	light	+0,+0	1.000	1.005	0.5	25.6 -> 31.4
GlassPanelPhoto	normal	dark	+0,+0	1.000	1.005	0.5	23.0 -> 27.0
ProgressBar	normal	dark	+0,+0	1.000	0.900	0.5	-
ProgressBar	normal	light	+0,+0	1.000	0.900	0.5	-
GlassIcon	normal	light	+0,+0	1.000	1.005	0.5	91.6 -> 92.3
GlassText	normal	light	+0,+0	1.000	1.005	0.5	91.6 -> 92.3
GlassPanelGrad	normal	light	+0,+0	1.000	1.005	0.5	22.3 -> 25.9
GlassPanelGrad	normal	dark	+1,+1	0.998	0.995	0.5	25.7 -> 22.5
GlassPanelGrey	normal	light	+0,+0	1.000	1.005	0.5	22.4 -> 26.0
GlassPanelRed	normal	dark	+1,+1	0.998	0.995	0.5	26.6 -> 22.8
GlassPanelRed	normal	light	+0,+0	1.000	1.005	0.5	22.1 -> 26.1
TextField	normal	light	+0,+0	1.000	1.000	0.0	13.4 -> 40.5
Slider	normal	dark	+0,+0	1.000	1.000	0.0	-
TextField	normal	dark	+0,+0	1.000	1.000	0.0	6.4 -> 15.1
TextField	disabled	dark	+0,+0	1.000	1.000	0.0	6.4 -> 15.9
Dialog	normal	dark	+0,+0	1.000	1.000	0.0	-
Dialog	normal	light	+0,+0	1.000	1.000	0.0	-

Side-by-side comparisons (worst first)

Tabs_normal_dark -- 83.45% fidelity (SSIM 0.8842) (no change)

Left: native widget. Right: Codename One render.
Tabs_normal_light -- 86.44% fidelity (SSIM 0.8961) (no change)

Left: native widget. Right: Codename One render.
Toolbar_normal_light -- 87.64% fidelity (SSIM 0.9511) (no change)

Left: native widget. Right: Codename One render.
Toolbar_normal_dark -- 87.70% fidelity (SSIM 0.9495) (no change)

Left: native widget. Right: Codename One render.
Button_pressed_dark -- 89.93% fidelity (SSIM 0.9576) (no change)

Left: native widget. Right: Codename One render.
TextField_normal_light -- 90.03% fidelity (SSIM 0.9576) (-0.37 vs baseline)

Left: native widget. Right: Codename One render.
Spinner_normal_dark -- 90.78% fidelity (SSIM 0.8814) (-0.69 vs baseline)

Left: native widget. Right: Codename One render.
TextField_disabled_light -- 91.13% fidelity (SSIM 0.9619) (-0.22 vs baseline)

Left: native widget. Right: Codename One render.
Spinner_normal_light -- 91.58% fidelity (SSIM 0.9099) (-0.21 vs baseline)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_light -- 91.76% fidelity (SSIM 0.9613) (+0.15 vs baseline)

Left: native widget. Right: Codename One render.
Button_normal_dark -- 91.84% fidelity (SSIM 0.9583) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_dark -- 92.13% fidelity (SSIM 0.9434) (-0.31 vs baseline)

Left: native widget. Right: Codename One render.
Switch_selected_light -- 92.13% fidelity (SSIM 0.9806) (no change)

Left: native widget. Right: Codename One render.
CheckBox_normal_light -- 92.16% fidelity (SSIM 0.9938) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_light -- 92.16% fidelity (SSIM 0.9938) (no change)

Left: native widget. Right: Codename One render.
FlatButton_normal_dark -- 92.21% fidelity (SSIM 0.9833) (+4.25 vs baseline)

Left: native widget. Right: Codename One render.
Button_normal_light -- 92.37% fidelity (SSIM 0.9609) (no change)

Left: native widget. Right: Codename One render.
Slider_normal_dark -- 92.52% fidelity (SSIM 0.9441) (-0.22 vs baseline)

Left: native widget. Right: Codename One render.
RaisedButton_disabled_dark -- 92.65% fidelity (SSIM 0.9653) (+1.25 vs baseline)

Left: native widget. Right: Codename One render.
CheckBox_disabled_light -- 92.71% fidelity (SSIM 0.9953) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_light -- 92.71% fidelity (SSIM 0.9953) (no change)

Left: native widget. Right: Codename One render.
Button_pressed_light -- 92.88% fidelity (SSIM 0.9617) (no change)

Left: native widget. Right: Codename One render.
FlatButton_pressed_dark -- 92.90% fidelity (SSIM 0.9849) (+2.31 vs baseline)

Left: native widget. Right: Codename One render.
TabsGeom_normal_dark -- 93.02% fidelity (SSIM 0.8921) (+0.01 vs baseline)

Left: native widget. Right: Codename One render.
TabsGeom_normal_light -- 93.02% fidelity (SSIM 0.8861) (no change)

Left: native widget. Right: Codename One render.
FlatButton_pressed_light -- 93.20% fidelity (SSIM 0.9819) (+4.33 vs baseline)

Left: native widget. Right: Codename One render.
Button_disabled_dark -- 93.52% fidelity (SSIM 0.9618) (no change)

Left: native widget. Right: Codename One render.
Slider_disabled_light -- 93.96% fidelity (SSIM 0.9625) (-0.05 vs baseline)

Left: native widget. Right: Codename One render.
FlatButton_normal_light -- 94.18% fidelity (SSIM 0.9825) (+1.32 vs baseline)

Left: native widget. Right: Codename One render.
Button_disabled_light -- 94.35% fidelity (SSIM 0.9636) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_dark -- 94.56% fidelity (SSIM 0.9653) (+1.46 vs baseline)

Left: native widget. Right: Codename One render.
RaisedButton_normal_dark -- 94.57% fidelity (SSIM 0.9659) (+1.69 vs baseline)

Left: native widget. Right: Codename One render.
RaisedButton_pressed_light -- 94.80% fidelity (SSIM 0.9665) (+2.04 vs baseline)

Left: native widget. Right: Codename One render.
RadioButton_selected_light -- 94.84% fidelity (SSIM 0.9916) (no change)

Left: native widget. Right: Codename One render.
RaisedButton_normal_light -- 95.01% fidelity (SSIM 0.9673) (+2.40 vs baseline)

Left: native widget. Right: Codename One render.
Slider_normal_light -- 95.09% fidelity (SSIM 0.9588) (-0.04 vs baseline)

Left: native widget. Right: Codename One render.
Switch_normal_light -- 95.51% fidelity (SSIM 0.9863) (no change)

Left: native widget. Right: Codename One render.
CheckBox_disabled_dark -- 95.76% fidelity (SSIM 0.9928) (no change)

Left: native widget. Right: Codename One render.
RadioButton_disabled_dark -- 95.76% fidelity (SSIM 0.9928) (no change)

Left: native widget. Right: Codename One render.
CheckBox_selected_light -- 95.80% fidelity (SSIM 0.9938) (no change)

Left: native widget. Right: Codename One render.
Switch_selected_dark -- 95.90% fidelity (SSIM 0.9850) (no change)

Left: native widget. Right: Codename One render.
Switch_disabled_light -- 96.35% fidelity (SSIM 0.9896) (+0.04 vs baseline)

Left: native widget. Right: Codename One render.
CheckBox_normal_dark -- 96.52% fidelity (SSIM 0.9927) (no change)

Left: native widget. Right: Codename One render.
RadioButton_normal_dark -- 96.52% fidelity (SSIM 0.9927) (no change)

Left: native widget. Right: Codename One render.
GlassPanelPhoto_normal_light -- 96.72% fidelity (SSIM 0.9804) (+0.64 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelPhoto_normal_dark -- 96.76% fidelity (SSIM 0.9832) (+0.59 vs baseline)

Left: native widget. Right: Codename One render.
TabOne_normal_dark -- 96.77% fidelity (SSIM 0.9526) (+0.73 vs baseline)

Left: native widget. Right: Codename One render.
Switch_normal_dark -- 96.80% fidelity (SSIM 0.9855) (no change)

Left: native widget. Right: Codename One render.
RadioButton_selected_dark -- 96.81% fidelity (SSIM 0.9908) (no change)

Left: native widget. Right: Codename One render.
TextField_normal_dark -- 96.88% fidelity (SSIM 0.9492) (-0.20 vs baseline)

Left: native widget. Right: Codename One render.
TextField_disabled_dark -- 97.19% fidelity (SSIM 0.9526) (-0.15 vs baseline)

Left: native widget. Right: Codename One render.
ProgressBar_normal_dark -- 97.47% fidelity (SSIM 0.9973) (+3.03 vs baseline)

Left: native widget. Right: Codename One render.
TabOne_normal_light -- 97.51% fidelity (SSIM 0.9608) (+1.89 vs baseline)

Left: native widget. Right: Codename One render.
ProgressBar_normal_light -- 97.60% fidelity (SSIM 0.9989) (+2.19 vs baseline)

Left: native widget. Right: Codename One render.
CheckBox_selected_dark -- 97.79% fidelity (SSIM 0.9932) (no change)

Left: native widget. Right: Codename One render.
Dialog_normal_dark -- 97.86% fidelity (SSIM 0.9614) (+0.89 vs baseline)

Left: native widget. Right: Codename One render.
Dialog_normal_light -- 97.95% fidelity (SSIM 0.9634) (+0.86 vs baseline)

Left: native widget. Right: Codename One render.
Switch_disabled_dark -- 98.01% fidelity (SSIM 0.9869) (+2.48 vs baseline)

Left: native widget. Right: Codename One render.
GlassIcon_normal_dark -- 98.59% fidelity (SSIM 0.9841) (no change)

Left: native widget. Right: Codename One render.
GlassText_normal_dark -- 98.64% fidelity (SSIM 0.9848) (+0.05 vs baseline)

Left: native widget. Right: Codename One render.
GlassIcon_normal_light -- 98.67% fidelity (SSIM 0.9860) (no change)

Left: native widget. Right: Codename One render.
GlassText_normal_light -- 98.74% fidelity (SSIM 0.9874) (+0.05 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelGrad_normal_light -- 98.91% fidelity (SSIM 0.9935) (+0.67 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelGrad_normal_dark -- 98.98% fidelity (SSIM 0.9928) (+0.55 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelGrey_normal_dark -- 98.99% fidelity (SSIM 0.9917) (+0.57 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelGrey_normal_light -- 99.05% fidelity (SSIM 0.9936) (+0.67 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelRed_normal_dark -- 99.09% fidelity (SSIM 0.9926) (+0.52 vs baseline)

Left: native widget. Right: Codename One render.
GlassPanelRed_normal_light -- 99.10% fidelity (SSIM 0.9939) (+0.67 vs baseline)

Left: native widget. Right: Codename One render.

# Conflicts: # .github/workflows/developer-guide-docs.yml # scripts/copyright-header-exclusions.txt

github-actions · 2026-10-26T04:12:39Z

Developer Guide build artifacts are available for download from this workflow run:

Developer Guide quality checks:

AsciiDoc linter: No issues found (report)
Vale: No alerts found (report)
Paragraph capitalization: No paragraph capitalization issues (report)
LanguageTool: No grammar matches (report)
Image references: No unused images detected (report)

github-actions · 2026-10-26T04:29:58Z

Cloudflare Preview

URL: https://pr-6106-website-preview.codenameone.pages.dev
Branch: pr-6106-website-preview

…names real animate functions Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog · 2026-10-26T05:18:14Z

Compared 210 screenshots: 210 matched.
Native Windows port (x64 / Intel-AMD): full hellocodenameone screenshot suite rendered offscreen with Direct2D/DirectWrite, plus the real benchmarks (base64 native/CN1/SIMD, image createMask/applyMask/modifyAlpha/PNG/JPEG, SSE2 SIMD kernels). Compared against the in-repo baseline in scripts/windows/screenshots.

Benchmark Results

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 29ms / native 2ms = 14.5x speedup
SIMD float-mul (64K x300)	java 28ms / native 2ms = 14.0x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 native bridge	unavailable (CN1 + SIMD + image benchmarks only)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	gated to scalar (CPU autovectorizes scalar; explicit SIMD not beneficial here)
Base64 CN1 encode	36.000 ms
Base64 CN1 decode	43.000 ms
Base64 SIMD encode	54.000 ms
Base64 encode ratio (SIMD/CN1)	1.500x (50.0% slower)
Base64 SIMD decode	54.000 ms
Base64 decode ratio (SIMD/CN1)	1.256x (25.6% slower)
Image encode benchmark iterations	100
Image createMask (SIMD off)	5.000 ms
Image createMask (SIMD on)	3.000 ms
Image createMask ratio (SIMD on/off)	0.600x (40.0% faster)
Image applyMask (SIMD off)	18.000 ms
Image applyMask (SIMD on)	28.000 ms
Image applyMask ratio (SIMD on/off)	1.556x (55.6% slower)
Image modifyAlpha (SIMD off)	29.000 ms
Image modifyAlpha (SIMD on)	17.000 ms
Image modifyAlpha ratio (SIMD on/off)	0.586x (41.4% faster)
Image modifyAlpha removeColor (SIMD off)	27.000 ms
Image modifyAlpha removeColor (SIMD on)	13.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	0.481x (51.9% faster)

ParparVM vs HotSpot (JDK 25): Windows x64

Runner CPU: AMD64 Family 26 Model 2 Stepping 1, AuthenticAMD (baseline windows-x64@amd64-family-26-model-2-authenticamd)

Ratios are ParparVM / JDK 25: below 1.00x ParparVM is faster (time) or smaller (RAM). Median of 5 interleaved, paired rounds; every run's output was verified. A ratio more than 20% (time) / 25% (RAM) above its baseline in vm/selfhost/perf-baseline/ is a regression and fails; one that far below is an improvement, reported but not failed (a row whose calibration runs were noisier carries a wider tolerance), and for RAM the change must also exceed 0.05x in absolute terms. Both run unpinned on all of the runner's CPUs, with their own default thread counts.

Benchmark	Cores	Time	RAM	Status
hello (WinHelloMain)	4	1.60x (base 1.41x, +13.8%)	0.62x (base 0.68x, -8.9%)	ok
translator (self)	4	0.85x (base 0.90x, -5.1%)	0.47x (base 0.47x, +1.4%)	ok
intArithmetic	4	1.00x (base 0.99x, +0.6%)	0.06x (base 0.05x, +3.0%)	ok
longArithmetic	4	0.99x (base 0.99x, +0.5%)	0.06x (base 0.05x, +3.2%)	ok
mathTranscendental	4	0.93x (base 0.94x, -0.9%)	0.06x (base 0.06x, +2.4%)	ok
arraySequential	4	1.73x (base 1.75x, -0.9%)	0.38x (base 0.38x, +0.3%)	ok
arrayRandom	4	0.96x (base 1.00x, -4.4%)	0.22x (base 0.23x, -0.7%)	ok
objectAllocation	4	1.54x (base 1.65x, -6.5%)	0.24x (base 0.21x, +16.9%)	ok
valueEscape	4	0.10x (base 0.10x, -0.1%)	0.05x (base 0.04x, +4.0%)	ok
hashMapChurn	4	1.55x (base 1.59x, -2.7%)	0.08x (base 0.09x, -4.8%)	ok
stringBuilding	4	1.42x (base 1.39x, +2.1%)	0.27x (base 0.27x, +0.1%)	ok
recursion	4	1.42x (base 1.44x, -1.5%)	0.06x (base 0.06x, +3.2%)	ok
quicksort	4	1.01x (base 1.06x, -4.3%)	0.12x (base 0.12x, +1.5%)	ok

Result: no regression

shai-almog · 2026-10-26T05:47:56Z

Compared 210 screenshots: 210 matched.
Native Windows port (arm64 / Apple Silicon - Arm): full hellocodenameone screenshot suite rendered offscreen with Direct2D/DirectWrite, plus the real benchmarks (base64 native/CN1/SIMD, image createMask/applyMask/modifyAlpha/PNG/JPEG, NEON SIMD kernels). Compared against the in-repo baseline in scripts/windows/screenshots.

Benchmark Results

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 49ms / native 3ms = 16.3x speedup
SIMD float-mul (64K x300)	java 49ms / native 2ms = 24.5x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 native bridge	unavailable (CN1 + SIMD + image benchmarks only)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	gated to scalar (CPU autovectorizes scalar; explicit SIMD not beneficial here)
Base64 CN1 encode	60.000 ms
Base64 CN1 decode	69.000 ms
Base64 SIMD encode	78.000 ms
Base64 encode ratio (SIMD/CN1)	1.300x (30.0% slower)
Base64 SIMD decode	72.000 ms
Base64 decode ratio (SIMD/CN1)	1.043x (4.3% slower)
Image encode benchmark iterations	100
Image createMask (SIMD off)	6.000 ms
Image createMask (SIMD on)	2.000 ms
Image createMask ratio (SIMD on/off)	0.333x (66.7% faster)
Image applyMask (SIMD off)	16.000 ms
Image applyMask (SIMD on)	18.000 ms
Image applyMask ratio (SIMD on/off)	1.125x (12.5% slower)
Image modifyAlpha (SIMD off)	18.000 ms
Image modifyAlpha (SIMD on)	8.000 ms
Image modifyAlpha ratio (SIMD on/off)	0.444x (55.6% faster)
Image modifyAlpha removeColor (SIMD off)	19.000 ms
Image modifyAlpha removeColor (SIMD on)	8.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	0.421x (57.9% faster)

ParparVM vs HotSpot (JDK 25): Windows arm64

Runner CPU: ARMv8 (64-bit) Family 8 Model D49 Revision 0, MICROSOFT CORPORATION (baseline windows-arm64@armv8-64-bit-family-8-model-d49-microsoft-corporation)

Ratios are ParparVM / JDK 25: below 1.00x ParparVM is faster (time) or smaller (RAM). Median of 5 interleaved, paired rounds; every run's output was verified. A ratio more than 20% (time) / 25% (RAM) above its baseline in vm/selfhost/perf-baseline/ is a regression and fails; one that far below is an improvement, reported but not failed (a row whose calibration runs were noisier carries a wider tolerance), and for RAM the change must also exceed 0.05x in absolute terms. Both run unpinned on all of the runner's CPUs, with their own default thread counts.

Benchmark	Cores	Time	RAM	Status
hello (WinHelloMain)	4	1.05x (base 1.11x, -5.1%)	0.70x (base 0.75x, -7.1%)	ok
translator (self)	4	0.89x (base 0.84x, +5.6%)	0.49x (base 0.51x, -3.2%)	ok
intArithmetic	4	1.04x (base 1.04x, -0.0%)	0.06x (base 0.06x, +3.0%)	ok
longArithmetic	4	0.79x (base 0.80x, -0.0%)	0.06x (base 0.06x, +3.5%)	ok
mathTranscendental	4	0.71x (base 0.72x, -1.4%)	0.07x (base 0.06x, +1.9%)	ok
arraySequential	4	0.40x (base 0.46x, -11.2%)	0.39x (base 0.39x, +0.0%)	ok
arrayRandom	4	0.94x (base 0.94x, +0.5%)	0.23x (base 0.23x, +0.3%)	ok
objectAllocation	4	1.81x (base 1.82x, -0.7%)	0.41x (base 0.43x, -4.4%)	ok
valueEscape	4	0.76x (base 0.76x, +0.1%)	0.05x (base 0.05x, +2.5%)	ok
hashMapChurn	4	0.99x (base 0.98x, +1.0%)	0.12x (base 0.12x, -1.4%)	ok
stringBuilding	4	1.52x (base 1.43x, +6.8%)	0.27x (base 0.27x, +0.1%)	ok
recursion	4	1.56x (base 1.46x, +6.6%)	0.07x (base 0.07x, +1.3%)	ok
quicksort	4	1.01x (base 1.00x, +0.4%)	0.12x (base 0.12x, +0.6%)	ok

Result: no regression

github-actions · 2026-10-26T06:01:11Z

✅ ByteCodeTranslator Quality Report

Test & Coverage

✅ Tests: 888 total, 0 failed, 55 skipped

Benchmark Results

Execution Time: 7457 ms
Hotspots (Top 20 sampled methods):
- 9.69% com.codename1.tools.translator.IteratorEscape.mangle (107 samples)
- 6.34% java.util.ArrayList.indexOf (70 samples)
- 5.71% com.codename1.tools.translator.BytecodeMethod.equals (63 samples)
- 5.71% java.lang.System.identityHashCode (63 samples)
- 4.53% java.lang.Object.hashCode (50 samples)
- 4.53% com.codename1.tools.translator.classfile.analysis.Frame.execute (50 samples)
- 2.90% com.codename1.tools.translator.bytecodes.Invoke.findMethodUp (32 samples)
- 2.72% java.lang.StringBuilder.append (30 samples)
- 2.36% java.lang.String.equals (26 samples)
- 2.08% java.util.HashMap.hash (23 samples)
- 1.72% com.codename1.tools.translator.BytecodeMethod.updateInlinableFieldDependencies (19 samples)
- 1.54% com.codename1.tools.translator.JavascriptReachability.enqueueResolved (17 samples)
- 1.45% java.util.AbstractCollection.containsAll (16 samples)
- 1.36% com.codename1.tools.translator.IteratorEscape.ctorOnlyStoresParamsIntoThis (15 samples)
- 1.36% com.codename1.tools.translator.ByteCodeClass.hasDeclaredMethod (15 samples)
- 1.09% com.codename1.tools.translator.Parser.cullMethods (12 samples)
- 1.00% com.codename1.tools.translator.bytecodes.Invoke.resolveDirectTarget (11 samples)
- 1.00% com.codename1.tools.translator.DeadFieldElimination.run (11 samples)
- 0.91% com.codename1.tools.translator.ReachabilityCull.markCalled (10 samples)
- 0.91% java.io.FileOutputStream.writeBytes (10 samples)
⚠️ Coverage report not generated.

Static Analysis

✅ SpotBugs: no findings (report was not generated by the build).
⚠️ PMD report not generated.
⚠️ Checkstyle report not generated.

Generated automatically by the PR CI workflow.

shai-almog · 2026-10-26T08:23:18Z

Compared 196 screenshots: 196 matched.
✅ Native Mac screenshot tests passed.

Benchmark Results

VM Translation Time: 0 seconds
Compilation Time: 581 seconds

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 61ms / native 2ms = 30.5x speedup
SIMD float-mul (64K x300)	java 61ms / native 3ms = 20.3x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 native bridge	unavailable (CN1 + SIMD + image benchmarks only)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	active (NEON-accelerated)
Base64 CN1 encode	57.000 ms
Base64 CN1 decode	68.000 ms
Image encode benchmark iterations	100
Image createMask (SIMD off)	9.000 ms
Image createMask (SIMD on)	11.000 ms
Image createMask ratio (SIMD on/off)	1.222x (22.2% slower)
Image applyMask (SIMD off)	78.000 ms
Image applyMask (SIMD on)	66.000 ms
Image applyMask ratio (SIMD on/off)	0.846x (15.4% faster)
Image modifyAlpha (SIMD off)	78.000 ms
Image modifyAlpha (SIMD on)	72.000 ms
Image modifyAlpha ratio (SIMD on/off)	0.923x (7.7% faster)
Image modifyAlpha removeColor (SIMD off)	86.000 ms
Image modifyAlpha removeColor (SIMD on)	63.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	0.733x (26.7% faster)

ParparVM vs HotSpot (JDK 25): macOS arm64

Runner CPU: Apple M1 (Virtual) (baseline macos-arm64)

1 improvement past the baseline (not a failure; rebaseline to lock it in):

translator (self) on all 3 CPUs: RAM 0.48x against a 0.78x baseline (-39.1%, tolerance 35%)

Ratios are ParparVM / JDK 25: below 1.00x ParparVM is faster (time) or smaller (RAM). Median of 5 interleaved, paired rounds; every run's output was verified. A ratio more than 20% (time) / 25% (RAM) above its baseline in vm/selfhost/perf-baseline/ is a regression and fails; one that far below is an improvement, reported but not failed (a row whose calibration runs were noisier carries a wider tolerance), and for RAM the change must also exceed 0.05x in absolute terms. Both run unpinned on all of the runner's CPUs, with their own default thread counts.

Benchmark	Cores	Time	RAM	Status
hello (HelloCodenameOne)	3	0.72x (base 0.96x, -24.6%)	0.87x (base 0.93x, -5.8%)	ok
translator (self)	3	0.63x (base 0.62x, +1.0%)	0.48x (base 0.78x, -39.1%)	improved: rebaseline to lock in (RAM -39.1%)
intArithmetic	3	1.04x (base 1.03x, +0.8%)	0.12x (base 0.12x, +1.3%)	ok
longArithmetic	3	1.03x (base 1.03x, +0.3%)	0.12x (base 0.07x, +64.6%)	ok
mathTranscendental	3	0.97x (base 1.01x, -3.4%)	0.12x (base 0.12x, +0.8%)	ok
arraySequential	3	0.45x (base 0.42x, +7.2%)	0.53x (base 0.53x, -0.1%)	ok
arrayRandom	3	0.93x (base 0.99x, -5.6%)	0.33x (base 0.32x, +0.6%)	ok
objectAllocation	3	1.06x (base 1.11x, -4.0%)	0.82x (base 0.72x, +13.3%)	ok
valueEscape	3	0.51x (base 0.51x, +0.4%)	0.09x (base 0.09x, +0.6%)	ok
hashMapChurn	3	0.98x (base 1.18x, -16.7%)	0.07x (base 0.07x, -1.8%)	ok
stringBuilding	3	0.92x (base 0.84x, +9.7%)	0.46x (base 0.46x, -0.9%)	ok
recursion	3	1.25x (base 1.24x, +1.4%)	0.12x (base 0.12x, +1.2%)	ok
quicksort	3	0.99x (base 1.01x, -2.3%)	0.11x (base 0.11x, +1.9%)	ok

A change that moves performance ON PURPOSE records the new baseline in vm/selfhost/perf-baseline/pr/6106.json, with the reason, from this job's perf-results.json. The rebaseline is then part of this pull request's diff:

python3 vm/selfhost/calibrate-perf-baseline.py --pr 6106 --reason "<why these benchmarks moved>" perf-results.json

Result: no regression (improved past the baseline: consider rebaselining)

…rd covers the Compose screens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…ows KmpCompat goldens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…ith their implementors JVMS 5.5 initializes a superinterface declaring a default method together with any class implementing it. The JS runtime only initialized the superclass chain, and a default method reads its own interface's statics without an init guard, so Compose's MonotonicFrameClock.getKey() (= Key) answered null; CombinedContext.minusKey(null) then failed Kotlin's parameter check, whose message builder indexed an empty stack trace (AIOOBE 0 in every KmpCompat screenshot test). The translator now flags such interfaces (D: 1) and ensureClassInitialized and its suspending twin initialize them after the base class. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog · 2026-10-26T10:47:59Z

Compared 210 screenshots: 210 matched.
Native Windows port, REAL shipping pipeline: the hellocodenameone screenshot suite rendered by a binary CROSS-COMPILED on Linux (clang-cl + xwin, WebView2 linked) and RUN on a Windows x64 runner. Compared against the in-repo baseline in scripts/windows/screenshots.

Benchmark Results

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	SSE2 (x64) / NEON (arm64) native kernels
SIMD int-add (64K x300)	java 56ms / native 6ms = 9.3x speedup
SIMD float-mul (64K x300)	java 56ms / native 6ms = 9.3x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 native bridge	unavailable (CN1 + SIMD + image benchmarks only)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	gated to scalar (CPU autovectorizes scalar; explicit SIMD not beneficial here)
Base64 CN1 encode	75.000 ms
Base64 CN1 decode	93.000 ms
Base64 SIMD encode	116.000 ms
Base64 encode ratio (SIMD/CN1)	1.547x (54.7% slower)
Base64 SIMD decode	105.000 ms
Base64 decode ratio (SIMD/CN1)	1.129x (12.9% slower)
Image encode benchmark iterations	100
Image createMask (SIMD off)	9.000 ms
Image createMask (SIMD on)	4.000 ms
Image createMask ratio (SIMD on/off)	0.444x (55.6% faster)
Image applyMask (SIMD off)	30.000 ms
Image applyMask (SIMD on)	29.000 ms
Image applyMask ratio (SIMD on/off)	0.967x (3.3% faster)
Image modifyAlpha (SIMD off)	35.000 ms
Image modifyAlpha (SIMD on)	20.000 ms
Image modifyAlpha ratio (SIMD on/off)	0.571x (42.9% faster)
Image modifyAlpha removeColor (SIMD off)	27.000 ms
Image modifyAlpha removeColor (SIMD on)	16.000 ms
Image modifyAlpha removeColor ratio (SIMD on/off)	0.593x (40.7% faster)

…routines' stdlib; JS KmpCompat goldens; guide terms Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog · 2026-10-26T13:17:54Z

Compared 231 screenshots: 231 matched.
✅ JavaScript-port screenshot tests passed.

…lib; arm64 Linux suite gets swap; Android KmpCompat goldens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

# Conflicts: # docs/developer-guide/languagetool-accept.txt

shai-almog · 2026-10-26T18:56:08Z

Compared 195 screenshots: 195 matched.

Native Android coverage

📊 Line coverage: 19.18% (55952/291705 lines covered) [HTML preview] (artifact android-coverage-report, jacocoAndroidReport/html/index.html)
- Other counters: instruction 18.14% (269515/1486140), branch 12.40% (19601/158078), complexity 10.35% (15772/152375), method 15.70% (11356/72309), class 27.90% (2232/7999)
- Lowest covered classes
  - kotlin.collections.unsigned.kotlin.collections.unsigned.UArraysKt___UArraysKt – 0.00% (0/2396 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.ClassReader – 0.00% (0/1524 lines covered)
  - androidx.compose.runtime.androidx.compose.runtime.LinkComposer – 0.00% (0/1430 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.MethodWriter – 0.00% (0/922 lines covered)
  - kotlinx.coroutines.channels.kotlinx.coroutines.channels.BufferedChannel – 0.00% (0/863 lines covered)
  - kotlin.sequences.kotlin.sequences.SequencesKt___SequencesKt – 0.00% (0/744 lines covered)
  - com.google.common.cache.com.google.common.cache.LocalCache$Segment – 0.00% (0/726 lines covered)
  - okio.okio.Buffer – 0.00% (0/687 lines covered)
  - kotlin.text.kotlin.text.StringsKt___StringsKt – 0.00% (0/630 lines covered)
  - com.codename1.androidcompat.rt.com.codename1.androidcompat.rt.TextXmlPullParser – 0.00% (0/623 lines covered)

✅ Native Android screenshot tests passed.

Native Android coverage

📊 Line coverage: 19.18% (55952/291705 lines covered) [HTML preview] (artifact android-coverage-report, jacocoAndroidReport/html/index.html)
- Other counters: instruction 18.14% (269515/1486140), branch 12.40% (19601/158078), complexity 10.35% (15772/152375), method 15.70% (11356/72309), class 27.90% (2232/7999)
- Lowest covered classes
  - kotlin.collections.unsigned.kotlin.collections.unsigned.UArraysKt___UArraysKt – 0.00% (0/2396 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.ClassReader – 0.00% (0/1524 lines covered)
  - androidx.compose.runtime.androidx.compose.runtime.LinkComposer – 0.00% (0/1430 lines covered)
  - org.jacoco.agent.rt.internal_0e20598.asm.org.jacoco.agent.rt.internal_0e20598.asm.MethodWriter – 0.00% (0/922 lines covered)
  - kotlinx.coroutines.channels.kotlinx.coroutines.channels.BufferedChannel – 0.00% (0/863 lines covered)
  - kotlin.sequences.kotlin.sequences.SequencesKt___SequencesKt – 0.00% (0/744 lines covered)
  - com.google.common.cache.com.google.common.cache.LocalCache$Segment – 0.00% (0/726 lines covered)
  - okio.okio.Buffer – 0.00% (0/687 lines covered)
  - kotlin.text.kotlin.text.StringsKt___StringsKt – 0.00% (0/630 lines covered)
  - com.codename1.androidcompat.rt.com.codename1.androidcompat.rt.TextXmlPullParser – 0.00% (0/623 lines covered)

Benchmark Results

Detailed Performance Metrics

Metric	Duration
SIMD kernel backend	scalar fallback (no native SIMD)
SIMD int-add (64K x300)	java 127ms / native 172ms = 0.7x speedup
SIMD float-mul (64K x300)	java 139ms / native 67ms = 2.0x speedup
SIMD kernel correctness	PASS (native result == scalar reference)
Base64 payload size	8192 bytes
Base64 benchmark iterations	6000
Base64 SIMD byte path	gated to scalar (CPU autovectorizes scalar; explicit SIMD not beneficial here)
Base64 CN1 encode	88.000 ms
Base64 CN1 decode	84.000 ms
Base64 native encode	438.000 ms
Base64 encode ratio (CN1/native)	0.201x (79.9% faster)
Base64 native decode	292.000 ms
Base64 decode ratio (CN1/native)	0.288x (71.2% faster)
Image encode benchmark status	skipped (SIMD unsupported)

…ass removed An application that never reaches a lowered updater lost the owner class and its header, and the Linux demo build then failed on a missing coroutines header. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

# Conflicts: # .github/workflows/developer-guide-docs.yml # scripts/developer-guide/validate-guide-snippets.py

shai-almog · 2026-10-27T10:41:53Z

Compared 210 screenshots: 210 matched.
Native Linux port (x64), GTK3/Cairo/Pango, ParparVM bytecode-to-C (no JVM): the hellocodenameone screenshot suite rendered by a native ELF built + run on the GitHub x64 runner. Baseline: scripts/linux/screenshots.

ParparVM vs HotSpot (JDK 25): Linux x64

Runner CPU: INTEL(R) XEON(R) PLATINUM 8573C (baseline linux-x64@intel-xeon-platinum-8573c)

1 improvement past the baseline (not a failure; rebaseline to lock it in):

translator (self) on all 4 CPUs: time 0.53x against a 0.67x baseline (-20.4%, tolerance 20%)

Ratios are ParparVM / JDK 25: below 1.00x ParparVM is faster (time) or smaller (RAM). Median of 5 interleaved, paired rounds; every run's output was verified. A ratio more than 20% (time) / 25% (RAM) above its baseline in vm/selfhost/perf-baseline/ is a regression and fails; one that far below is an improvement, reported but not failed (a row whose calibration runs were noisier carries a wider tolerance), and for RAM the change must also exceed 0.05x in absolute terms. Both run unpinned on all of the runner's CPUs, with their own default thread counts.

Benchmark	Cores	Time	RAM	Status
hello (LinuxHelloMain)	4	0.98x (base 0.94x, +4.2%)	0.73x (base 0.88x, -16.3%)	ok
translator (self)	4	0.53x (base 0.67x, -20.4%)	0.47x (base 0.44x, +7.6%)	improved: rebaseline to lock in (time -20.4%)
intArithmetic	4	1.02x (base 1.03x, -0.4%)	0.06x (base 0.07x, -22.9%)	ok
longArithmetic	4	0.96x (base 0.96x, +0.1%)	0.08x (base 0.05x, +39.7%)	ok
mathTranscendental	4	1.04x (base 1.03x, +0.1%)	0.06x (base 0.06x, +3.3%)	ok
arraySequential	4	2.40x (base 2.69x, -10.8%)	0.38x (base 0.35x, +5.7%)	ok
arrayRandom	4	1.04x (base 1.05x, -1.6%)	0.23x (base 0.21x, +10.0%)	ok
objectAllocation	4	0.95x (base 1.03x, -8.2%)	0.40x (base 0.51x, -20.8%)	ok
valueEscape	4	0.13x (base 0.13x, -0.6%)	0.05x (base 0.04x, +8.3%)	ok
hashMapChurn	4	0.94x (base 1.00x, -6.6%)	0.10x (base 0.10x, +9.0%)	ok
stringBuilding	4	1.55x (base 1.53x, +1.0%)	0.22x (base 0.22x, -2.1%)	ok
recursion	4	1.11x (base 1.05x, +5.2%)	0.06x (base 0.06x, +0.2%)	ok
quicksort	4	1.09x (base 1.08x, +0.9%)	0.11x (base 0.11x, +1.2%)	ok

A change that moves performance ON PURPOSE records the new baseline in vm/selfhost/perf-baseline/pr/6106.json, with the reason, from this job's perf-results.json. The rebaseline is then part of this pull request's diff:

python3 vm/selfhost/calibrate-perf-baseline.py --pr 6106 --reason "<why these benchmarks moved>" perf-results.json

Result: no regression (improved past the baseline: consider rebaselining)

shai-almog · 2026-10-27T10:42:00Z

Compared 210 screenshots: 210 matched.
Native Linux port (arm64), GTK3/Cairo/Pango, ParparVM bytecode-to-C (no JVM): the hellocodenameone screenshot suite rendered by a native ELF built + run on the GitHub arm64 runner. Baseline: scripts/linux/screenshots-arm.

ParparVM vs HotSpot (JDK 25): Linux arm64

Runner CPU: Neoverse-N2 (baseline linux-arm64@neoverse-n2)

Ratios are ParparVM / JDK 25: below 1.00x ParparVM is faster (time) or smaller (RAM). Median of 5 interleaved, paired rounds; every run's output was verified. A ratio more than 20% (time) / 25% (RAM) above its baseline in vm/selfhost/perf-baseline/ is a regression and fails; one that far below is an improvement, reported but not failed (a row whose calibration runs were noisier carries a wider tolerance), and for RAM the change must also exceed 0.05x in absolute terms. Both run unpinned on all of the runner's CPUs, with their own default thread counts.

Benchmark	Cores	Time	RAM	Status
hello (LinuxHelloMain)	4	0.97x (base 1.02x, -5.4%)	0.74x (base 0.93x, -20.6%)	ok
translator (self)	4	0.74x (base 0.70x, +6.4%)	0.46x (base 0.43x, +7.0%)	ok
intArithmetic	4	1.04x (base 1.04x, -0.2%)	0.03x (base 0.03x, +4.4%)	ok
longArithmetic	4	0.79x (base 0.79x, -0.2%)	0.03x (base 0.03x, +4.8%)	ok
mathTranscendental	4	1.09x (base 1.10x, -0.3%)	0.04x (base 0.03x, +9.2%)	ok
arraySequential	4	0.34x (base 0.36x, -5.3%)	0.37x (base 0.37x, +0.2%)	ok
arrayRandom	4	0.94x (base 0.94x, +0.3%)	0.20x (base 0.20x, +0.7%)	ok
objectAllocation	4	1.79x (base 1.77x, +1.4%)	0.37x (base 0.37x, -0.3%)	ok
valueEscape	4	0.51x (base 0.51x, -0.1%)	0.03x (base 0.03x, +9.0%)	ok
hashMapChurn	4	0.85x (base 0.84x, +1.0%)	0.11x (base 0.12x, -6.7%)	ok
stringBuilding	4	1.36x (base 1.57x, -13.5%)	0.26x (base 0.26x, +1.1%)	ok
recursion	4	1.42x (base 1.43x, -0.7%)	0.04x (base 0.04x, +2.8%)	ok
quicksort	4	1.01x (base 0.99x, +1.4%)	0.09x (base 0.09x, +1.0%)	ok

Result: no regression

shai-almog and others added 2 commits October 25, 2026 21:12

ci: KMP tests mapped to a port-status feature; copyright headers

1d82250

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog and others added 2 commits October 25, 2026 21:35

ci: install compose-compat where hellocodenameone builds on a partial…

fd4dbcb

… reactor; guide snippets by tag Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs: copyright header on the KMP guide snippet

afb0656

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog and others added 2 commits October 26, 2026 03:55

ci: KMP on every target - stage kotlinx/Kotlin 2 for native and JS, A…

e513247

…ndroid duplicate classes, guide snippets, mac goldens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ci: guide workflows watch the KMP snippet tree; Android keeps the app…

e1a2ea2

…'s coroutines version Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Merge remote-tracking branch 'origin/master' into kmp-compose-compat

816bfd5

# Conflicts: # .github/workflows/developer-guide-docs.yml # scripts/copyright-header-exclusions.txt

ci: Android strips the coroutines jar's _COROUTINE frames too; guide …

f81fd99

…names real animate functions Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog and others added 4 commits October 26, 2026 11:13

ParparVM on Windows opens long and non-ASCII paths; hello C build gua…

9ac1593

…rd covers the Compose screens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

compose-compat drops the coroutines metadata-only root artifact; Wind…

a911a2f

…ows KmpCompat goldens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

js runtime: say where superclass interfaces are initialized

e9dd9a5

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Android: Kotlin apps default to a compiler that reads the declared co…

bc371cd

…routines' stdlib; JS KmpCompat goldens; guide terms Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

shai-almog and others added 2 commits October 26, 2026 19:57

Android raises a pinned Kotlin older than the shipped coroutines' std…

6e41bfc

…lib; arm64 Linux suite gets swap; Android KmpCompat goldens Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Merge remote-tracking branch 'origin/master' into kmp-compose-compat

d4afbb1

# Conflicts: # docs/developer-guide/languagetool-accept.txt

shai-almog and others added 3 commits October 27, 2026 01:15

Linux x64 and arm64 KmpCompat goldens

2b43cb2

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Merge remote-tracking branch 'origin/master' into kmp-compose-compat

7c1f893

# Conflicts: # .github/workflows/developer-guide-docs.yml # scripts/developer-guide/validate-guide-snippets.py

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