104 lines
3.6 KiB
JavaScript
104 lines
3.6 KiB
JavaScript
/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2019 The noVNC authors
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* Licensed under MPL 2.0 (see LICENSE.txt)
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*
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* See README.md for usage and integration instructions.
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*
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*/
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import * as Log from '../util/logging.js';
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export default class RawDecoder {
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constructor() {
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this._lines = 0;
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}
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decodeRect(x, y, width, height, sock, display, depth, bgrMode = false) {
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// Log BGR mode status for the first few rects to debug
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if (this._lines === 0) {
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Log.Debug("RawDecoder: Processing rectangle with " +
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(bgrMode ? "BGR" : "RGB") + " mode, depth: " + depth);
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}
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if ((width === 0) || (height === 0)) {
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return true;
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}
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if (this._lines === 0) {
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this._lines = height;
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}
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const pixelSize = depth == 8 ? 1 : 4;
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const bytesPerLine = width * pixelSize;
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while (this._lines > 0) {
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if (sock.rQwait("RAW", bytesPerLine)) {
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return false;
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}
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const curY = y + (height - this._lines);
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let data = sock.rQshiftBytes(bytesPerLine, false);
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// For debugging - show a sample of the data for the first rect
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if (this._lines === height && curY === y) {
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let sample = "";
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for (let i = 0; i < Math.min(16, width); i++) {
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if (pixelSize === 4) {
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sample += "[" + data[i*4] + "," + data[i*4+1] + "," +
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data[i*4+2] + "," + data[i*4+3] + "] ";
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} else {
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sample += data[i] + " ";
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}
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}
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Log.Debug("RawDecoder: First " + Math.min(16, width) +
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" pixels (before processing): " + sample);
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}
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// Convert data if needed
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if (depth == 8) {
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const newdata = new Uint8Array(width * 4);
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for (let i = 0; i < width; i++) {
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newdata[i * 4 + 0] = ((data[i] >> 0) & 0x3) * 255 / 3;
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newdata[i * 4 + 1] = ((data[i] >> 2) & 0x3) * 255 / 3;
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newdata[i * 4 + 2] = ((data[i] >> 4) & 0x3) * 255 / 3;
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newdata[i * 4 + 3] = 255;
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}
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data = newdata;
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} else if (bgrMode) {
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// In bgrMode we need to switch the red and blue bytes
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// so that the data is in RGB order
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Log.Debug("RawDecoder: Applying BGR swap for line " + curY);
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for (let i = 0; i < width; i++) {
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let j = i * 4;
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let red = data[j];
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data[j] = data[j + 2];
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data[j + 2] = red;
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}
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} else {
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// Make sure the image is fully opaque
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for (let i = 0; i < width; i++) {
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data[i * 4 + 3] = 255;
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}
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}
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// For debugging - show processed data for the first rect
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if (this._lines === height && curY === y) {
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let sample = "";
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for (let i = 0; i < Math.min(16, width); i++) {
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sample += "[" + data[i*4] + "," + data[i*4+1] + "," +
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data[i*4+2] + "," + data[i*4+3] + "] ";
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}
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Log.Debug("RawDecoder: First " + Math.min(16, width) +
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" pixels (after processing): " + sample);
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}
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display.blitImage(x, curY, width, 1, data, 0);
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this._lines--;
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}
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return true;
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}
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}
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