Class ImageEncoder

Currently ImageEncode color modes:

PageColorType.Grayscale:

White (0xffffff) - background
Black (0x000000) - dot

PageColorType.DoubleColor:

White (0xffffff) - background
Black (0x000000) - dot
Red (0xff0000) - second color dot (lower temperature)

PageColorType.Grayscale:

16-level grayscale mode. Pixel colors are converted to luminance and packed as two 4-bit dots per byte (0 = white, 15 = black).

Index

Constructors

Methods

colorToGrayLevel encode encodeCanvas indexPixels

Constructors

constructor

new ImageEncoder(): ImageEncoder
Returns ImageEncoder

Methods

`Static`colorToGrayLevel

colorToGrayLevel(color: number): number
Convert a 0xRRGGBB color to a 4-bit grayscale level. 0 is white and 15 is black.
Parameters
- color: number
Returns number
- Defined in src/utils/image_encoder.ts:103

`Static`encode

encode(
    source: ImageSource,
    pageColor: PageColorType,
    printDirection: PrintDirection,
): EncodedImage
Parameters
- source: ImageSource
- pageColor: PageColorType
- printDirection: PrintDirection
Returns EncodedImage
- Defined in src/utils/image_encoder.ts:113

`Static`encodeCanvas

encodeCanvas(
    canvas: HTMLCanvasElement,
    pageColor: PageColorType,
    printDirection: PrintDirection,
): EncodedImage
printDirection = "left" rotates image for 90 degrees clockwise
Parameters
- canvas: HTMLCanvasElement
- pageColor: PageColorType
- printDirection: PrintDirection
Returns EncodedImage
- Defined in src/utils/image_encoder.ts:90

`Static`indexPixels

indexPixels(data: Uint8Array): Uint8Array
Parameters
- data: Uint8Array
  Pixels encoded by encodeCanvas (byte is 8 pixels)
Returns Uint8Array
Array of indexes where every index stored in two bytes (big endian)
- Defined in src/utils/image_encoder.ts:247