ArrayBuffer怎么赋值给Sprite

Creator 3.x
#1

想把微信小游戏相机数据,实时赋值给sprite (# Camera.onCameraFrame),当一个全透明的背景图,ArrayBuffer怎么转成SpriteFrame

#2

看看文档,截图数据怎么转的!一样的东西

#3

ab->base64加image头

#4 
/**
 * 图片数据转Base64
 *  let imageData = jsb.fileUtils.getDataFromFile(filePath);
 *  let base64Data = JSUtile.imageToBase64(imageData);
 * 
 */
public static imageToBase64(bytes) {

    var base64 = '';

    var encodings = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

    var byteLength = bytes.byteLength;

    var byteRemainder = byteLength % 3;

    var mainLength = byteLength - byteRemainder;

    var a, b, c, d;

    var chunk;

    // Main loop deals with bytes in chunks of 3

    for (var i = 0; i < mainLength; i = i + 3) {

        // Combine the three bytes into a single integer

        chunk = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];

        // Use bitmasks to extract 6-bit segments from the triplet

        a = (chunk & 16515072) >> 18; // 16515072 = (2^6 - 1) << 18

        b = (chunk & 258048) >> 12; // 258048 = (2^6 - 1) << 12

        c = (chunk & 4032) >> 6; // 4032 = (2^6 - 1) << 6

        d = chunk & 63; // 63 = 2^6 - 1

        // Convert the raw binary segments to the appropriate ASCII encoding

        base64 += encodings[a] + encodings[b] + encodings[c] + encodings[d];

    }

    // Deal with the remaining bytes and padding

    if (byteRemainder == 1) {

        chunk = bytes[mainLength];

        a = (chunk & 252) >> 2; // 252 = (2^6 - 1) << 2;

        // Set the 4 least significant bits to zero

        b = (chunk & 3) << 4; // 3 = 2^2 - 1;

        base64 += encodings[a] + encodings[b] + '==';

    } else if (byteRemainder == 2) {

        chunk = (bytes[mainLength] << 8) | bytes[mainLength + 1];

        a = (chunk & 16128) >> 8; // 16128 = (2^6 - 1) << 8;

        b = (chunk & 1008) >> 4; // 1008 = (2^6 - 1) << 4;

        // Set the 2 least significant bits to zero

        c = (chunk & 15) << 2; // 15 = 2^4 - 1;

        base64 += encodings[a] + encodings[b] + encodings[c] + '=';

    }

    return 'data:image/png;base64,' + base64;

    // return base64;

}

或者用 UPNG @pdf-lib/upng - npm (npmjs.com)

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