PixelFormat enum

Supported pixel formats in the XVision library.

Defines the color space, channel order, bit depth, and memory layout (packed or planar/semi-planar) used to interpret raw image buffers.

Inheritance
Available extensions

Values

rgb888 → const PixelFormat

Packed Red-Green-Blue format.

  • Channels: 3 (Red, Green, Blue)
  • Bit depth: 8 bits per channel (24 bits total per pixel)
  • Layout: Packed sequentially in memory: [R0, G0, B0, R1, G1, B1, ...]
  • Typical use cases: Standard web and desktop image processing.
rgba8888 → const PixelFormat

Packed Red-Green-Blue-Alpha format.

  • Channels: 4 (Red, Green, Blue, Alpha)
  • Bit depth: 8 bits per channel (32 bits total per pixel)
  • Layout: Packed sequentially in memory: [R0, G0, B0, A0, R1, G1, B1, A1, ...]
  • Typical use cases: Images with transparency support, PNG structures, UI overlays.
bgra8888 → const PixelFormat

Packed Blue-Green-Red-Alpha format.

  • Channels: 4 (Blue, Green, Red, Alpha)
  • Bit depth: 8 bits per channel (32 bits total per pixel)
  • Layout: Packed sequentially in memory: [B0, G0, R0, A0, B1, G1, R1, A1, ...]
  • Typical use cases: Windows GDI layouts, standard camera frames on certain systems.
argb8888 → const PixelFormat

Packed Alpha-Red-Green-Blue format.

  • Channels: 4 (Alpha, Red, Green, Blue)
  • Bit depth: 8 bits per channel (32 bits total per pixel)
  • Layout: Packed sequentially in memory: [A0, R0, G0, B0, A1, R1, G1, B1, ...]
  • Typical use cases: Legacy formats, specific GPU textures.
gray8 → const PixelFormat

8-bit single-channel grayscale format.

  • Channels: 1 (Luminance)
  • Bit depth: 8 bits per pixel
  • Layout: Single byte per pixel: [Y0, Y1, Y2, ...]
  • Typical use cases: Edge detection, morphological operations, high-performance algorithms.
gray16 → const PixelFormat

16-bit single-channel grayscale format.

  • Channels: 1 (High-bit-depth Luminance)
  • Bit depth: 16 bits per pixel
  • Layout: Two bytes per pixel (unsigned short): [Y0_low, Y0_high, Y1_low, Y1_high, ...]
  • Typical use cases: Medical imaging, raw camera sensors, depth maps.
float32 → const PixelFormat

32-bit single-channel floating-point format.

  • Channels: 1 (Luminance)
  • Bit depth: 32 bits per pixel (float32)
  • Layout: Four bytes per pixel (IEEE 754 float): [F0, F1, F2, ...]
  • Typical use cases: Machine learning model input preprocessing, HDR processing.
yuv420 → const PixelFormat

Planar YUV 4:2:0 format.

  • Channels: 3 (Y: Luminance, U/V: Chroma)
  • Chroma subsampling: 4:2:0 (horizontal and vertical subsampling by 2)
  • Layout: Planar. All Y values first, followed by all U values, followed by all V values.
  • Average bits per pixel: 12 bits (1.5 bytes)
  • Typical use cases: Video codecs, compression pipelines.
nv21 → const PixelFormat

Semi-planar YUV 4:2:0 format (NV21).

  • Channels: 3 (Y: Luminance, U/V: Chroma)
  • Chroma subsampling: 4:2:0
  • Layout: Semi-planar. A contiguous Y plane followed by an interleaved V/U plane: [Y0, Y1, ... V0, U0, V1, U1, ...]
  • Average bits per pixel: 12 bits (1.5 bytes)
  • Typical use cases: Default camera preview format on Android OS.
nv12 → const PixelFormat

Semi-planar YUV 4:2:0 format (NV12).

  • Channels: 3 (Y: Luminance, U/V: Chroma)
  • Chroma subsampling: 4:2:0
  • Layout: Semi-planar. A contiguous Y plane followed by an interleaved U/V plane: [Y0, Y1, ... U0, V0, U1, V1, ...]
  • Average bits per pixel: 12 bits (1.5 bytes)
  • Typical use cases: iOS camera output, video hardware acceleration.

Properties

bytesPerPixel → double

Available on PixelFormat, provided by the PixelFormatProperties extension

Average number of bytes occupied by a single pixel.
no setter
channels → int

Available on PixelFormat, provided by the PixelFormatProperties extension

Number of logical color/luminance channels present in the format.
no setter
hashCode → int
The hash code for this object.
no setterinherited
index → int
A numeric identifier for the enumerated value.
no setterinherited
isPacked → bool

Available on PixelFormat, provided by the PixelFormatProperties extension

True if pixel values are packed sequentially in memory (e.g. RGB RGB RGB).
no setter
isYuv → bool

Available on PixelFormat, provided by the PixelFormatProperties extension

Returns true if the format is planar or semi-planar YUV 4:2:0.
no setter
name → String

Available on Enum, provided by the EnumName extension

The name of the enum value.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

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

Constants

values → const List<PixelFormat>
A constant List of the values in this enum, in order of their declaration.