mirror of
https://github.com/Ylianst/MeshCentral.git
synced 2024-11-26 16:06:33 +03:00
117 lines
3.1 KiB
JavaScript
117 lines
3.1 KiB
JavaScript
/*
|
|
* Copyright (c) 2015 Sylvain Peyrefitte
|
|
*
|
|
* This file is part of mstsc.js.
|
|
*
|
|
* mstsc.js is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
(function() {
|
|
|
|
/**
|
|
* decompress bitmap from RLE algorithm
|
|
* @param bitmap {object} bitmap object of bitmap event of node-rdpjs
|
|
*/
|
|
function decompress (bitmap) {
|
|
var fName = null;
|
|
switch (bitmap.bitsPerPixel) {
|
|
case 15:
|
|
fName = 'bitmap_decompress_15';
|
|
break;
|
|
case 16:
|
|
fName = 'bitmap_decompress_16';
|
|
break;
|
|
case 24:
|
|
fName = 'bitmap_decompress_24';
|
|
break;
|
|
case 32:
|
|
fName = 'bitmap_decompress_32';
|
|
break;
|
|
default:
|
|
throw 'invalid bitmap data format';
|
|
}
|
|
|
|
var input = new Uint8Array(bitmap.data);
|
|
var inputPtr = Module._malloc(input.length);
|
|
var inputHeap = new Uint8Array(Module.HEAPU8.buffer, inputPtr, input.length);
|
|
inputHeap.set(input);
|
|
|
|
var output_width = bitmap.destRight - bitmap.destLeft + 1;
|
|
var output_height = bitmap.destBottom - bitmap.destTop + 1;
|
|
var ouputSize = output_width * output_height * 4;
|
|
var outputPtr = Module._malloc(ouputSize);
|
|
|
|
var outputHeap = new Uint8Array(Module.HEAPU8.buffer, outputPtr, ouputSize);
|
|
|
|
var res = Module.ccall(fName,
|
|
'number',
|
|
['number', 'number', 'number', 'number', 'number', 'number', 'number', 'number'],
|
|
[outputHeap.byteOffset, output_width, output_height, bitmap.width, bitmap.height, inputHeap.byteOffset, input.length]
|
|
);
|
|
|
|
var output = new Uint8ClampedArray(outputHeap.buffer, outputHeap.byteOffset, ouputSize);
|
|
|
|
Module._free(inputPtr);
|
|
Module._free(outputPtr);
|
|
|
|
return { width : output_width, height : output_height, data : output };
|
|
}
|
|
|
|
/**
|
|
* Un compress bitmap are reverse in y axis
|
|
*/
|
|
function reverse (bitmap) {
|
|
return { width : bitmap.width, height : bitmap.height, data : new Uint8ClampedArray(bitmap.data) };
|
|
}
|
|
|
|
/**
|
|
* Canvas renderer
|
|
* @param canvas {canvas} use for rendering
|
|
*/
|
|
function Canvas(canvas) {
|
|
this.canvas = canvas;
|
|
this.ctx = canvas.getContext("2d");
|
|
}
|
|
|
|
Canvas.prototype = {
|
|
/**
|
|
* update canvas with new bitmap
|
|
* @param bitmap {object}
|
|
*/
|
|
update : function (bitmap) {
|
|
var output = null;
|
|
if (bitmap.isCompress) {
|
|
output = decompress(bitmap);
|
|
}
|
|
else {
|
|
output = reverse(bitmap);
|
|
}
|
|
|
|
// use image data to use asm.js
|
|
var imageData = this.ctx.createImageData(output.width, output.height);
|
|
imageData.data.set(output.data);
|
|
this.ctx.putImageData(imageData, bitmap.destLeft, bitmap.destTop);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Module export
|
|
*/
|
|
Mstsc.Canvas = {
|
|
create : function (canvas) {
|
|
return new Canvas(canvas);
|
|
}
|
|
}
|
|
})();
|