@u4/adbkit
Version:
A Typescript client for the Android Debug Bridge.
48 lines • 2.05 kB
JavaScript
"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const assert_1 = __importDefault(require("assert"));
const stream_1 = require("stream");
class RgbTransform extends stream_1.Stream.Transform {
constructor(meta, options) {
super(options);
this.meta = meta;
this._buffer = Buffer.from('');
assert_1.default.ok(this.meta.bpp === 24 || this.meta.bpp === 32, 'Only 24-bit and 32-bit raw images with 8-bits per color are supported');
this._r_pos = this.meta.red_offset / 8;
this._g_pos = this.meta.green_offset / 8;
this._b_pos = this.meta.blue_offset / 8;
this._a_pos = this.meta.alpha_offset / 8;
this._pixel_bytes = this.meta.bpp / 8;
}
_transform(chunk, encoding, done) {
if (this._buffer.length) {
this._buffer = Buffer.concat([this._buffer, chunk], this._buffer.length + chunk.length);
}
else {
this._buffer = chunk;
}
let sourceCursor = 0;
let targetCursor = 0;
const target = this._pixel_bytes === 3 ? this._buffer : Buffer.alloc(Math.max(4, (chunk.length / this._pixel_bytes) * 3));
while (this._buffer.length - sourceCursor >= this._pixel_bytes) {
const r = this._buffer[sourceCursor + this._r_pos];
const g = this._buffer[sourceCursor + this._g_pos];
const b = this._buffer[sourceCursor + this._b_pos];
target[targetCursor + 0] = r;
target[targetCursor + 1] = g;
target[targetCursor + 2] = b;
sourceCursor += this._pixel_bytes;
targetCursor += 3;
}
if (targetCursor) {
this.push(target.slice(0, targetCursor));
this._buffer = this._buffer.slice(sourceCursor);
}
done();
}
}
exports.default = RgbTransform;
//# sourceMappingURL=rgbtransform.js.map