hdr.js

RGBE(.hdr) file reader/writer.

RGBE(.hdr) file viewer

Install

``sh
npm install --save hdr.js
`

Usage

- Load RGBE(.hdr) file:
`ts
load(url: string): Promise<{
width: number;
height: number;
rgbFloat: Float32Array;
}>
`
- Save RGBE(.hdr) file to disk:
`ts
save(float: Float32Array, width: number, height: number, filename: string): boolean
`
- Read float point data from RGBE(.hdr) file buffer:
`ts
read(uint8: Uint8Array): string | {
rgbFloat: Float32Array;
width: number;
height: number;
}
`
- Write float point data to RGBE(.hdr) file buffer:
`ts
write(x: number, y: number, data: Float32Array): Uint8Array
`
- Compress 96 bits float RGB data to 32 bits rgbe:
`ts
float2rgbe(float: Float32Array, rgbe: Uint8Array)
`
- Decompress 32 bits rgbe to 96 bits float RGB data:
`ts
rgbe2float(rgbe: Uint8Array, float: Float32Array)
`

$3

`js
HDRjs
.load(url)
.then(result => {
console.log(result);
})
.catch(message => {
console.error(message)
});
`

$3

`js
// Construct rgb float32 data
const width = 10;
const height = 10;
const rgbFloat = new Float32Array(width height 3);
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const i = (y width + x) 3;
rgbFloat[i + 0] = Math.random();
rgbFloat[i + 1] = Math.random();
rgbFloat[i + 2] = Math.random();
}
}

const saved = HDRjs.save(rgbFloat, width, height, 'filename');
if (!saved) {
// error
}
`

$3

`js
fetch(url)
.then(r => r.arrayBuffer())
.then(buf => {
const rgbe = new Uint8Array(buf);
const result = HDRjs.read(rgbe);
if (typeof result === 'string') {
// error
} else {
const { rgbFloat, width, height } = result;
}
});
`

$3

`js
// Construct rgb float32 data
const width = 10;
const height = 10;
const rgbFloat = new Float32Array(width height 3);
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const i = (y width + x) 3;
rgbFloat[i + 0] = Math.random();
rgbFloat[i + 1] = Math.random();
rgbFloat[i + 2] = Math.random();
}
}

// Write to uint8
const hdrFile = HDRjs.write(width, height, rgbFloat);

// Download
const a = document.createElement('a');
const url = URL.createObjectURL(new Blob([ hdrFile ]));
a.href = url;
a.download = 'output.hdr';
a.click();
`

$3

`js
const float = new Float32Array([0.3, 0.02, 0.1]);
const rgbe = new Uint8Array(4);
float2rgbe(float, rgbe);
// rgbe is [153, 10, 51, 127]
`

$3

`js
const rgbe = new Uint8Array([153, 10, 51, 127])
const float = new Float32Array(3);
rgbe2float(rgbe, float);
// float is [ 0.298828125, 0.01953125, 0.099609375 ]
``