import { createElementNS } from '../utils.js';
import { SRGBToLinear } from '../math/Color.js';
let _canvas;
class ImageUtils {
static getDataURL( image ) {
if ( /^data:/i.test( image.src ) ) {
return image.src;
}
if ( typeof HTMLCanvasElement == 'undefined' ) {
return image.src;
}
let canvas;
if ( image instanceof HTMLCanvasElement ) {
canvas = image;
} else {
if ( _canvas === undefined ) _canvas = createElementNS( 'canvas' );
_canvas.width = image.width;
_canvas.height = image.height;
const context = _canvas.getContext( '2d' );
if ( image instanceof ImageData ) {
context.putImageData( image, 0, 0 );
} else {
context.drawImage( image, 0, 0, image.width, image.height );
}
canvas = _canvas;
}
if ( canvas.width > 2048 || canvas.height > 2048 ) {
console.warn( 'THREE.ImageUtils.getDataURL: Image converted to jpg for performance reasons', image );
return canvas.toDataURL( 'image/jpeg', 0.6 );
} else {
return canvas.toDataURL( 'image/png' );
}
}
static sRGBToLinear( image ) {
if ( ( typeof HTMLImageElement !== 'undefined' && image instanceof HTMLImageElement ) ||
( typeof HTMLCanvasElement !== 'undefined' && image instanceof HTMLCanvasElement ) ||
( typeof ImageBitmap !== 'undefined' && image instanceof ImageBitmap ) ) {
const canvas = createElementNS( 'canvas' );
canvas.width = image.width;
canvas.height = image.height;
const context = canvas.getContext( '2d' );
context.drawImage( image, 0, 0, image.width, image.height );
const imageData = context.getImageData( 0, 0, image.width, image.height );
const data = imageData.data;
for ( let i = 0; i < data.length; i ++ ) {
data[ i ] = SRGBToLinear( data[ i ] / 255 ) * 255;
}
context.putImageData( imageData, 0, 0 );
return canvas;
} else if ( image.data ) {
const data = image.data.slice( 0 );
for ( let i = 0; i < data.length; i ++ ) {
if ( data instanceof Uint8Array || data instanceof Uint8ClampedArray ) {
data[ i ] = Math.floor( SRGBToLinear( data[ i ] / 255 ) * 255 );
} else {
// assuming float
data[ i ] = SRGBToLinear( data[ i ] );
}
}
return {
data: data,
width: image.width,
height: image.height
};
} else {
console.warn( 'THREE.ImageUtils.sRGBToLinear(): Unsupported image type. No color space conversion applied.' );
return image;
}
}
}
export { ImageUtils };
