LookupTable

Class: LookupTable

A precalculated lookup table to help us traverse the pixel buffer.

[red1, green1, blue1, alpha1, redN, greenN, blueN, alphaN...]

Remarks

By precalculating a frequent traversal through a pixel buffer, we can avoid expensive and repetitive calculations while during rasterization.

The pixel index contains groups of four values that represent the RGBA values of a pixel:

• Red channel index
• Green channel index
• Blue channel index
• Alpha channel index

The length of this array is equal to the area of the row and column counts.

Table of contents

Constructors

• constructor

Properties

• columnCount
• coords
• coordsFlipped
• pixelIndex
• pixelIndexFlippedY
• rowCount

Accessors

• length

Constructors

constructor

• new LookupTable(rowCount, columnCount, characterHeight, pixelRatio)

Parameters

Name	Type
rowCount	number
columnCount	number
characterHeight	number
pixelRatio	number

Defined in

utils/LookupTable.mts:42

Properties

columnCount

• columnCount: number

Defined in

utils/LookupTable.mts:42

---

coords

• Readonly coords: CharacterCoords

Defined in

utils/LookupTable.mts:39

---

coordsFlipped

• Readonly coordsFlipped: CharacterCoords

Defined in

utils/LookupTable.mts:40

---

pixelIndex

• Readonly pixelIndex: Uint32Array

The lookup table used to map the RGBA buffer to the ASCII art canvas.

Defined in

utils/LookupTable.mts:33

---

pixelIndexFlippedY

• Readonly pixelIndexFlippedY: Uint32Array

The lookup table used to map the RGBA buffer to the ASCII art canvas. This is the same as pixelIndex, but with the Y axis flipped for WebGL.

Defined in

utils/LookupTable.mts:38

---

rowCount

• rowCount: number

Defined in

utils/LookupTable.mts:42

Accessors

length

• get length(): number

Returns

number

Defined in

utils/LookupTable.mts:85