bkinnightskytw
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pdf_signature
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refactor: signature rotation and improve its performance

This commit is contained in:
insleker 2025-09-05 15:33:53 +08:00
parent a354efb0b1
commit 6dc095e23e
11 changed files with 386 additions and 194 deletions
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3
README.md
View File

@ -32,7 +32,8 @@ flutter run -d <device_id>
### build
For Windows
#### Windows
```bash
flutter build windows
# create windows installer

36
lib/data/services/export_service.dart
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@ -171,7 +171,14 @@ class ExportService {
pw.Positioned(
left: left,
top: top,
child: pw.Image(imgObj, width: w, height: h),
child: pw.SizedBox(
width: w,
height: h,
child: pw.FittedBox(
fit: pw.BoxFit.contain,
child: pw.Image(imgObj),
),
),
),
);
}
@ -187,7 +194,14 @@ class ExportService {
pw.Positioned(
left: left,
top: top,
child: pw.Image(sigImgObj, width: w, height: h),
child: pw.SizedBox(
width: w,
height: h,
child: pw.FittedBox(
fit: pw.BoxFit.contain,
child: pw.Image(sigImgObj),
),
),
),
);
}
@ -294,7 +308,14 @@ class ExportService {
pw.Positioned(
left: left,
top: top,
child: pw.Image(imgObj, width: w, height: h),
child: pw.SizedBox(
width: w,
height: h,
child: pw.FittedBox(
fit: pw.BoxFit.contain,
child: pw.Image(imgObj),
),
),
),
);
}
@ -310,7 +331,14 @@ class ExportService {
pw.Positioned(
left: left,
top: top,
child: pw.Image(sigImgObj, width: w, height: h),
child: pw.SizedBox(
width: w,
height: h,
child: pw.FittedBox(
fit: pw.BoxFit.contain,
child: pw.Image(sigImgObj),
),
),
),
);
}

101
lib/ui/features/pdf/view_model/view_model.dart
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@ -385,22 +385,32 @@ class SignatureController extends StateNotifier<SignatureState> {
// Bind the processed image at placement time (so placed preview matches adjustments).
// If processed bytes exist, always create a new asset for this placement.
String id = '';
final processed = ref.read(processedSignatureImageProvider);
if (processed != null && processed.isNotEmpty) {
// Compose final bytes for placement: apply adjustments (processed) then rotation.
Uint8List? srcBytes = ref.read(processedSignatureImageProvider);
srcBytes ??= state.imageBytes;
// If still null, fall back to asset reference only.
if (srcBytes != null && srcBytes.isNotEmpty) {
final rot = state.rotation % 360;
Uint8List finalBytes = srcBytes;
if (rot != 0) {
try {
final decoded = img.decodeImage(srcBytes);
if (decoded != null) {
var out = img.copyRotate(
decoded,
angle: rot,
interpolation: img.Interpolation.linear,
);
finalBytes = Uint8List.fromList(img.encodePng(out, level: 6));
}
} catch (_) {}
}
id = ref
.read(signatureLibraryProvider.notifier)
.add(processed, name: 'image');
} else {
// Fallback to current image source
final bytes = state.imageBytes;
if (bytes != null && bytes.isNotEmpty) {
id = ref
.read(signatureLibraryProvider.notifier)
.add(bytes, name: 'image');
.add(finalBytes, name: 'image');
} else {
id = state.assetId ?? 'default.png';
}
}
// Store as UI-space rect (consistent with export and rendering paths)
ref
.read(pdfProvider.notifier)
@ -426,21 +436,30 @@ class SignatureController extends StateNotifier<SignatureState> {
final pdf = container.read(pdfProvider);
if (!pdf.loaded) return null;
String id = '';
final processed = container.read(processedSignatureImageProvider);
if (processed != null && processed.isNotEmpty) {
Uint8List? srcBytes = container.read(processedSignatureImageProvider);
srcBytes ??= state.imageBytes;
if (srcBytes != null && srcBytes.isNotEmpty) {
final rot = state.rotation % 360;
Uint8List finalBytes = srcBytes;
if (rot != 0) {
try {
final decoded = img.decodeImage(srcBytes);
if (decoded != null) {
var out = img.copyRotate(
decoded,
angle: rot,
interpolation: img.Interpolation.linear,
);
finalBytes = Uint8List.fromList(img.encodePng(out, level: 6));
}
} catch (_) {}
}
id = container
.read(signatureLibraryProvider.notifier)
.add(processed, name: 'image');
} else {
final bytes = state.imageBytes;
if (bytes != null && bytes.isNotEmpty) {
id = container
.read(signatureLibraryProvider.notifier)
.add(bytes, name: 'image');
.add(finalBytes, name: 'image');
} else {
id = state.assetId ?? 'default.png';
}
}
container
.read(pdfProvider.notifier)
.addPlacement(page: pdf.currentPage, rect: r, image: id);
@ -473,19 +492,33 @@ final signatureProvider =
/// current adjustment settings (contrast/brightness) and background removal.
/// Returns null if no image is loaded. The output is a PNG to preserve alpha.
final processedSignatureImageProvider = Provider<Uint8List?>((ref) {
final s = ref.watch(signatureProvider);
// Watch only the fields that affect pixel processing to avoid recompute on rotation.
final String? assetId = ref.watch(signatureProvider.select((s) => s.assetId));
final Uint8List? directBytes = ref.watch(
signatureProvider.select((s) => s.imageBytes),
);
final double contrast = ref.watch(
signatureProvider.select((s) => s.contrast),
);
final double brightness = ref.watch(
signatureProvider.select((s) => s.brightness),
);
final bool bgRemoval = ref.watch(
signatureProvider.select((s) => s.bgRemoval),
);
// If active overlay is based on a library asset, pull its bytes
Uint8List? bytes;
if (s.assetId != null) {
if (assetId != null) {
final lib = ref.watch(signatureLibraryProvider);
for (final a in lib) {
if (a.id == s.assetId) {
if (a.id == assetId) {
bytes = a.bytes;
break;
}
}
} else {
bytes = s.imageBytes;
bytes = directBytes;
}
if (bytes == null || bytes.isEmpty) return null;
@ -501,9 +534,7 @@ final processedSignatureImageProvider = Provider<Uint8List?>((ref) {
}
// Parameters
final double contrast = s.contrast; // [0..2], 1 = neutral
final double brightness = s.brightness; // [-1..1], 0 = neutral
final double rotationDeg = s.rotation; // degrees
// Rotation is not applied here (UI uses Transform; export applies once).
const int thrLow = 220; // begin soft transparency from this avg luminance
const int thrHigh = 245; // fully transparent from this avg luminance
@ -529,7 +560,7 @@ final processedSignatureImageProvider = Provider<Uint8List?>((ref) {
// Near-white background removal (compute average luminance)
final int avg = ((r + g + b) / 3).round();
int remAlpha = 255; // 255 = fully opaque, 0 = transparent
if (s.bgRemoval) {
if (bgRemoval) {
if (avg >= thrHigh) {
remAlpha = 0;
} else if (avg >= thrLow) {
@ -548,15 +579,9 @@ final processedSignatureImageProvider = Provider<Uint8List?>((ref) {
}
}
// Apply rotation if any (around center) using bilinear interpolation and keep size
if (rotationDeg % 360 != 0) {
// The image package rotates counter-clockwise; positive degrees rotate CCW
out = img.copyRotate(
out,
angle: rotationDeg,
interpolation: img.Interpolation.linear,
);
}
// NOTE: Do not rotate here to keep UI responsive while dragging the slider.
// Rotation is applied in the UI using Transform.rotate for preview and
// performed once on confirm/export to avoid per-frame recomputation.
// Encode as PNG to preserve transparency
final png = img.encodePng(out, level: 6);

9
lib/ui/features/pdf/widgets/image_editor_dialog.dart
View File

@ -4,6 +4,7 @@ import 'package:pdf_signature/l10n/app_localizations.dart';
import '../view_model/view_model.dart';
import 'adjustments_panel.dart';
import 'rotated_signature_image.dart';
class ImageEditorDialog extends ConsumerWidget {
const ImageEditorDialog({super.key});
@ -47,7 +48,13 @@ class ImageEditorDialog extends ConsumerWidget {
if (bytes == null) {
return Text(l.noSignatureLoaded);
}
return Image.memory(bytes, fit: BoxFit.contain);
return RotatedSignatureImage(
bytes: bytes,
rotationDeg: sig.rotation,
enableAngleAwareScale: true,
fit: BoxFit.contain,
wrapInRepaintBoundary: true,
);
},
),
),

38
lib/ui/features/pdf/widgets/pdf_screen.dart
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@ -9,6 +9,7 @@ import 'package:pdfrx/pdfrx.dart';
import 'package:multi_split_view/multi_split_view.dart';
import '../../../../data/services/export_providers.dart';
import 'package:image/image.dart' as img;
import '../view_model/view_model.dart';
import 'draw_canvas.dart';
import 'pdf_toolbar.dart';
@ -137,16 +138,39 @@ class _PdfSignatureHomePageState extends ConsumerState<PdfSignatureHomePage> {
final useMock = ref.read(useMockViewerProvider);
bool ok = false;
String? savedPath;
// Helper to apply rotation to bytes for export (single-signature path only)
Uint8List? _rotatedForExport(Uint8List? src, double deg) {
if (src == null || src.isEmpty) return src;
final r = deg % 360;
if (r == 0) return src;
try {
final decoded = img.decodeImage(src);
if (decoded == null) return src;
final out = img.copyRotate(
decoded,
angle: r,
interpolation: img.Interpolation.linear,
);
return Uint8List.fromList(img.encodePng(out, level: 6));
} catch (_) {
return src;
}
}
if (kIsWeb) {
Uint8List? src = pdf.pickedPdfBytes;
if (src != null) {
final processed = ref.read(processedSignatureImageProvider);
final rotated = _rotatedForExport(
processed ?? sig.imageBytes,
sig.rotation,
);
final bytes = await exporter.exportSignedPdfFromBytes(
srcBytes: src,
signedPage: pdf.signedPage,
signatureRectUi: sig.rect,
uiPageSize: SignatureController.pageSize,
signatureImageBytes: processed ?? sig.imageBytes,
signatureImageBytes: rotated,
placementsByPage: pdf.placementsByPage,
placementImageByPage: pdf.placementImageByPage,
libraryBytes: {
@ -174,12 +198,16 @@ class _PdfSignatureHomePageState extends ConsumerState<PdfSignatureHomePage> {
savedPath = fullPath;
if (pdf.pickedPdfBytes != null) {
final processed = ref.read(processedSignatureImageProvider);
final rotated = _rotatedForExport(
processed ?? sig.imageBytes,
sig.rotation,
);
final out = await exporter.exportSignedPdfFromBytes(
srcBytes: pdf.pickedPdfBytes!,
signedPage: pdf.signedPage,
signatureRectUi: sig.rect,
uiPageSize: SignatureController.pageSize,
signatureImageBytes: processed ?? sig.imageBytes,
signatureImageBytes: rotated,
placementsByPage: pdf.placementsByPage,
placementImageByPage: pdf.placementImageByPage,
libraryBytes: {
@ -200,13 +228,17 @@ class _PdfSignatureHomePageState extends ConsumerState<PdfSignatureHomePage> {
ok = true;
} else {
final processed = ref.read(processedSignatureImageProvider);
final rotated = _rotatedForExport(
processed ?? sig.imageBytes,
sig.rotation,
);
ok = await exporter.exportSignedPdfFromFile(
inputPath: pdf.pickedPdfPath!,
outputPath: fullPath,
signedPage: pdf.signedPage,
signatureRectUi: sig.rect,
uiPageSize: SignatureController.pageSize,
signatureImageBytes: processed ?? sig.imageBytes,
signatureImageBytes: rotated,
placementsByPage: pdf.placementsByPage,
placementImageByPage: pdf.placementImageByPage,
libraryBytes: {

132
lib/ui/features/pdf/widgets/rotated_signature_image.dart Normal file
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@ -0,0 +1,132 @@
import 'dart:math' as math;
import 'dart:typed_data';
import 'package:flutter/material.dart';
/// A lightweight widget to render signature bytes with rotation and an
/// angle-aware scale-to-fit so the rotated image stays within its bounds.
class RotatedSignatureImage extends StatefulWidget {
const RotatedSignatureImage({
super.key,
required this.bytes,
this.rotationDeg = 0.0,
this.enableAngleAwareScale = true,
this.fit = BoxFit.contain,
this.gaplessPlayback = true,
this.filterQuality = FilterQuality.low,
this.wrapInRepaintBoundary = true,
this.alignment = Alignment.center,
this.semanticLabel,
this.intrinsicAspectRatio,
});
final Uint8List bytes;
final double rotationDeg;
final bool enableAngleAwareScale;
final BoxFit fit;
final bool gaplessPlayback;
final FilterQuality filterQuality;
final bool wrapInRepaintBoundary;
final AlignmentGeometry alignment;
final String? semanticLabel;
// Optional: intrinsic aspect ratio (width / height). If provided, we compute
// an angle-aware scale for non-square images to ensure the rotated rectangle
// (W,H) fits back into its (W,H) bounds. If null, we attempt to derive it
// from the image stream; only fall back to the square heuristic if unknown.
final double? intrinsicAspectRatio;
@override
State<RotatedSignatureImage> createState() => _RotatedSignatureImageState();
}
class _RotatedSignatureImageState extends State<RotatedSignatureImage> {
ImageStream? _stream;
ImageStreamListener? _listener;
double? _derivedAspectRatio; // width / height
MemoryImage get _provider => MemoryImage(widget.bytes);
@override
void didChangeDependencies() {
super.didChangeDependencies();
_resolveImage();
}
@override
void didUpdateWidget(covariant RotatedSignatureImage oldWidget) {
super.didUpdateWidget(oldWidget);
if (!identical(oldWidget.bytes, widget.bytes)) {
_derivedAspectRatio = null;
_resolveImage();
}
}
void _resolveImage() {
_unlisten();
// Only derive AR if not provided
if (widget.intrinsicAspectRatio != null) return;
final stream = _provider.resolve(createLocalImageConfiguration(context));
_stream = stream;
_listener = ImageStreamListener((ImageInfo info, bool sync) {
final w = info.image.width;
final h = info.image.height;
if (w > 0 && h > 0) {
final ar = w / h;
if (mounted && _derivedAspectRatio != ar) {
setState(() => _derivedAspectRatio = ar);
}
}
});
stream.addListener(_listener!);
}
void _unlisten() {
if (_stream != null && _listener != null) {
_stream!.removeListener(_listener!);
}
_stream = null;
_listener = null;
}
@override
void dispose() {
_unlisten();
super.dispose();
}
@override
Widget build(BuildContext context) {
final angle = widget.rotationDeg * math.pi / 180.0;
Widget img = Image.memory(
widget.bytes,
fit: widget.fit,
gaplessPlayback: widget.gaplessPlayback,
filterQuality: widget.filterQuality,
alignment: widget.alignment,
semanticLabel: widget.semanticLabel,
);
if (angle != 0.0) {
if (widget.enableAngleAwareScale) {
final double c = math.cos(angle).abs();
final double s = math.sin(angle).abs();
final ar = widget.intrinsicAspectRatio ?? _derivedAspectRatio;
double scaleToFit;
if (ar != null && ar > 0) {
scaleToFit = math.min(ar / (ar * c + s), 1.0 / (ar * s + c));
} else {
// Fallback: square approximation
scaleToFit = 1.0 / (c + s).clamp(1.0, double.infinity);
}
img = Transform.scale(
scale: scaleToFit,
child: Transform.rotate(angle: angle, child: img),
);
} else {
img = Transform.rotate(angle: angle, child: img);
}
}
if (!widget.wrapInRepaintBoundary) return img;
return RepaintBoundary(child: img);
}
}

30
lib/ui/features/pdf/widgets/signature_card.dart
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@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
import '../view_model/view_model.dart';
import 'signature_drag_data.dart';
import '../../../common/menu_labels.dart';
import 'rotated_signature_image.dart';
class SignatureCard extends StatelessWidget {
const SignatureCard({
@ -12,6 +13,7 @@ class SignatureCard extends StatelessWidget {
this.onTap,
this.onAdjust,
this.useCurrentBytesForDrag = false,
this.rotationDeg = 0.0,
});
final SignatureAsset asset;
final bool disabled;
@ -19,10 +21,19 @@ class SignatureCard extends StatelessWidget {
final VoidCallback? onTap;
final VoidCallback? onAdjust;
final bool useCurrentBytesForDrag;
final double rotationDeg;
@override
Widget build(BuildContext context) {
final img = Image.memory(asset.bytes, fit: BoxFit.contain);
// Fit inside 96x64 with 6px padding using the shared rotated image widget
const boxW = 96.0, boxH = 64.0, pad = 6.0;
Widget img = RotatedSignatureImage(
bytes: asset.bytes,
rotationDeg: rotationDeg,
enableAngleAwareScale: true,
fit: BoxFit.contain,
wrapInRepaintBoundary: true,
);
Widget base = SizedBox(
width: 96,
height: 64,
@ -36,7 +47,14 @@ class SignatureCard extends StatelessWidget {
border: Border.all(color: Theme.of(context).dividerColor),
borderRadius: BorderRadius.circular(8),
),
child: Padding(padding: const EdgeInsets.all(6), child: img),
child: Padding(
padding: const EdgeInsets.all(pad),
child: SizedBox(
width: boxW - pad * 2,
height: boxH - pad * 2,
child: img,
),
),
),
),
Positioned(
@ -142,7 +160,13 @@ class SignatureCard extends StatelessWidget {
),
child: Padding(
padding: const EdgeInsets.all(6.0),
child: Image.memory(asset.bytes, fit: BoxFit.contain),
child: RotatedSignatureImage(
bytes: asset.bytes,
rotationDeg: rotationDeg,
enableAngleAwareScale: true,
fit: BoxFit.contain,
wrapInRepaintBoundary: true,
),
),
),
),

2
lib/ui/features/pdf/widgets/signature_drawer.dart
View File

@ -58,6 +58,7 @@ class _SignatureDrawerState extends ConsumerState<SignatureDrawer> {
name: a.name,
)
: a,
rotationDeg: (sig.assetId == a.id) ? sig.rotation : 0.0,
disabled: disabled,
onDelete:
() => ref
@ -95,6 +96,7 @@ class _SignatureDrawerState extends ConsumerState<SignatureDrawer> {
? Text(l.noSignatureLoaded)
: SignatureCard(
asset: SignatureAsset(id: '', bytes: bytes, name: ''),
rotationDeg: sig.rotation,
disabled: disabled,
useCurrentBytesForDrag: true,
onDelete: () {

16
lib/ui/features/pdf/widgets/signature_overlay.dart
View File

@ -8,6 +8,7 @@ import '../../../../data/model/model.dart';
import '../view_model/view_model.dart';
import 'image_editor_dialog.dart';
import '../../../common/menu_labels.dart';
import 'rotated_signature_image.dart';
/// Renders a single signature overlay (either interactive or placed) on a page.
class SignatureOverlay extends ConsumerWidget {
@ -90,6 +91,7 @@ class SignatureOverlay extends ConsumerWidget {
border: Border.all(color: borderColor, width: borderWidth),
),
child: Stack(
alignment: Alignment.center,
children: [
_SignatureImage(
interactive: interactive,
@ -115,7 +117,7 @@ class SignatureOverlay extends ConsumerWidget {
),
);
if (interactive && sig.editingEnabled) {
if (interactive) {
content = GestureDetector(
key: const Key('signature_overlay'),
behavior: HitTestBehavior.opaque,
@ -277,10 +279,12 @@ class _SignatureImage extends ConsumerWidget {
return Center(child: Text(label));
}
Widget im = Image.memory(bytes, fit: BoxFit.contain);
if (sig.rotation % 360 != 0) {
im = Transform.rotate(angle: sig.rotation * math.pi / 180.0, child: im);
}
return im;
return RotatedSignatureImage(
bytes: bytes,
rotationDeg: interactive ? sig.rotation : 0.0,
enableAngleAwareScale: interactive,
fit: BoxFit.contain,
wrapInRepaintBoundary: true,
);
}
}

136
test/widget/e2e_place_confirm_test.dart
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@ -1,136 +0,0 @@
import 'dart:ui' as ui;
import 'package:flutter/gestures.dart' show kSecondaryMouseButton;
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:image/image.dart' as img;
import 'package:pdf_signature/ui/features/pdf/widgets/pdf_screen.dart';
import 'package:pdf_signature/ui/features/pdf/view_model/view_model.dart';
import 'package:pdf_signature/data/services/export_providers.dart';
import 'package:pdf_signature/l10n/app_localizations.dart';
void main() {
// Open the active overlay context menu robustly (mouse right-click, fallback to long-press)
Future<void> _openActiveMenuAndConfirm(WidgetTester tester) async {
final overlay = find.byKey(const Key('signature_overlay'));
expect(overlay, findsOneWidget);
// Ensure visible before interacting
await tester.ensureVisible(overlay);
await tester.pumpAndSettle();
// Try right-click first
final center = tester.getCenter(overlay);
final TestGesture mouse = await tester.createGesture(
kind: ui.PointerDeviceKind.mouse,
buttons: kSecondaryMouseButton,
);
await mouse.addPointer(location: center);
addTearDown(mouse.removePointer);
await tester.pump();
await mouse.down(center);
await tester.pump(const Duration(milliseconds: 30));
await mouse.up();
await tester.pumpAndSettle();
// If menu didn't appear, try long-press
if (find.byKey(const Key('ctx_active_confirm')).evaluate().isEmpty) {
await tester.longPress(overlay, warnIfMissed: false);
await tester.pumpAndSettle();
}
await tester.tap(find.byKey(const Key('ctx_active_confirm')));
await tester.pumpAndSettle();
}
// Build a simple in-memory PNG as a signature image
Uint8List _makeSig() {
final canvas = img.Image(width: 80, height: 40);
img.fill(canvas, color: img.ColorUint8.rgb(255, 255, 255));
img.drawLine(
canvas,
x1: 6,
y1: 20,
x2: 74,
y2: 20,
color: img.ColorUint8.rgb(0, 0, 0),
);
return Uint8List.fromList(img.encodePng(canvas));
}
testWidgets('E2E: select, place default, and confirm signature', (
tester,
) async {
final sigBytes = _makeSig();
await tester.pumpWidget(
ProviderScope(
overrides: [
// Open a PDF
pdfProvider.overrideWith(
(ref) => PdfController()..openPicked(path: 'test.pdf'),
),
// Provide one signature asset in the library
signatureLibraryProvider.overrideWith((ref) {
final c = SignatureLibraryController();
c.add(sigBytes, name: 'image');
return c;
}),
// Use mock continuous viewer for deterministic layout in widget tests
useMockViewerProvider.overrideWithValue(true),
],
child: MaterialApp(
localizationsDelegates: AppLocalizations.localizationsDelegates,
supportedLocales: AppLocalizations.supportedLocales,
home: const PdfSignatureHomePage(),
),
),
);
await tester.pumpAndSettle();
// Tap the signature card to set it as active overlay
final card = find.byKey(const Key('gd_signature_card_area')).first;
expect(card, findsOneWidget);
await tester.tap(card);
await tester.pump();
// Active overlay should appear
final active = find.byKey(const Key('signature_overlay'));
expect(active, findsOneWidget);
final sizeBefore = tester.getSize(active);
// Bring the overlay into the viewport (it's near the bottom of the page by default)
final listFinder = find.byKey(const Key('pdf_continuous_mock_list'));
if (listFinder.evaluate().isNotEmpty) {
// Ensure the active overlay is fully visible within the scrollable viewport
await tester.ensureVisible(active);
await tester.pumpAndSettle();
}
// Open context menu and confirm using a robust flow
await _openActiveMenuAndConfirm(tester);
// Verify active overlay gone and placed overlay shown
expect(find.byKey(const Key('signature_overlay')), findsNothing);
final placed = find.byKey(const Key('placed_signature_0'));
expect(placed, findsOneWidget);
final sizeAfter = tester.getSize(placed);
// Compare sizes: should be roughly equal (allowing small layout variance)
expect(
(sizeAfter.width - sizeBefore.width).abs() < sizeBefore.width * 0.15,
isTrue,
);
expect(
(sizeAfter.height - sizeBefore.height).abs() < sizeBefore.height * 0.15,
isTrue,
);
// Verify provider state reflects one placement on current page
final ctx = tester.element(find.byType(PdfSignatureHomePage));
final container = ProviderScope.containerOf(ctx);
final pdf = container.read(pdfProvider);
final list = pdf.placementsByPage[pdf.currentPage] ?? const [];
expect(list.length, 1);
});
}

73
test/widgets/rotated_signature_image_test.dart Normal file
View File

@ -0,0 +1,73 @@
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:image/image.dart' as img;
import 'package:pdf_signature/ui/features/pdf/widgets/rotated_signature_image.dart';
/// Generates a simple solid-color PNG with given width/height.
Uint8List makePng({required int w, required int h}) {
final im = img.Image(width: w, height: h);
// Fill with opaque white
img.fill(im, color: img.ColorRgba8(255, 255, 255, 255));
return Uint8List.fromList(img.encodePng(im));
}
void main() {
testWidgets('4:3 image rotated -90 deg scales to 3/4', (tester) async {
// 4:3 aspect image -> width/height = 4/3
final bytes = makePng(w: 400, h: 300);
// Pump widget under a fixed-size parent so Transform.scale is applied
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox(
width: 200,
height: 150, // same aspect as image bounds (4:3)
child: RotatedSignatureImage(
bytes: bytes,
rotationDeg: -90,
enableAngleAwareScale: true,
intrinsicAspectRatio: 4 / 3,
fit: BoxFit.contain,
wrapInRepaintBoundary: false, // make Transform visible
),
),
),
),
),
);
// Find the Transform widget that applies the scale (the outer Transform.scale)
final transformFinder = find.byType(Transform);
expect(transformFinder, findsWidgets);
// Among the Transforms, we expect one to be a scale-only matrix.
// Grab the first Transform and assert the scale on x (m4x4 matrix) equals 0.75.
Transform? scaleTransform;
for (final e in tester.widgetList<Transform>(transformFinder)) {
final m = e.transform.storage;
// A scale-only matrix will have m[0] and m[5] as scale factors on x/y, with zeros elsewhere (except last row/column)
// Also rotation transform will have off-diagonal terms; we want the one with zeros in 1,4 and 4,1 positions approximately.
final isLikelyScale =
(m[1].abs() < 1e-6) &&
(m[4].abs() < 1e-6) &&
(m[12].abs() < 1e-6) &&
(m[13].abs() < 1e-6);
if (isLikelyScale) {
scaleTransform = e;
break;
}
}
expect(scaleTransform, isNotNull, reason: 'Scale Transform not found');
final scale = scaleTransform!.transform.storage[0];
expect(
(scale - 0.75).abs() < 1e-6,
isTrue,
reason: 'Expected scale 0.75 for 4:3 rotated -90°',
);
});
}