UCameraUtils class abstract

Helpers shared by the camera page, the scanner and any app-level UI built on UCameraController. All of it is pure Dart, so it behaves the same on every platform.

Constructors

UCameraUtils()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

centeredScanWindow(Size bounds, Size size) → Rect

Normalized scan window for a centered rectangle of size inside bounds.

cropGray(UGrayImage image, Rect normalizedRegion) → UGrayImage

Crops a frame to a normalized region before decoding, the cheapest way to make scanning faster and more accurate.

denormalizePoint({required Offset normalized, required Size widgetSize, required UCameraSize previewSize, BoxFit fit = BoxFit.cover, bool mirrored = false}) → Offset

Inverse of normalizePoint: places a normalized point back on the widget.

extensionOf(String source, String fallback) → String

flashIcon(UFlashMode mode) → IconData

formatBytes(int bytes) → String

formatDuration(Duration duration) → String

mm:ss, or h:mm:ss past an hour — used by the recording indicator.

frameRectToWidget({required Rect frameRect, required Size widgetSize, required UCameraSize previewSize, BoxFit fit = BoxFit.cover, bool mirrored = false}) → Rect

Converts a rectangle in frame pixels to widget coordinates, which is what a tracking overlay needs to draw a box around a detected symbol.

grayToRgba(UGrayImage image) → Uint8List

Packs a grayscale buffer into ARGB pixels, ready for decodeImageFromPixels.

joinStructuredAppend(Iterable<UCode> codes) → String?

Splits a multi-part QR payload set (structured append) back into one string once every part has been scanned; returns null while parts are missing.

nextFlashMode(UFlashMode current, {bool includeTorch = true}) → UFlashMode

normalizePoint({required Offset local, required Size widgetSize, required UCameraSize previewSize, BoxFit fit = BoxFit.cover, bool mirrored = false}) → Offset

Maps a tap inside a preview box to the normalized (0..1) sensor point the controller expects, accounting for the preview being letterboxed or cropped by fit and for a mirrored front camera.

pickDevice(List<UCameraDevice> devices, {UCameraFacing facing = UCameraFacing.back, UCameraLens? lens}) → UCameraDevice?

Picks the device closest to facing, preferring the given lens.

resolutionLabel(UCameraResolution resolution) → String

rotateGray(UGrayImage image, int degrees) → UGrayImage

Rotates a grayscale buffer clockwise by 90, 180 or 270 degrees.

temporaryPath(String extension) → Future<String>

A timestamped path inside the app's temporary directory.

toFileData(UCapturedPhoto photo) → UFileData

Wraps a captured photo as the UFileData the rest of the package passes around, so camera output flows through uploads and pickers unchanged.

videoToFileData(UCapturedVideo video, {Uint8List? bytes}) → UFileData