@cryptotaxi247 / MeshCentral
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1 /*
2 * Copyright (c) 2015 Sylvain Peyrefitte
3 *
4 * This file is part of mstsc.js.
5 *
6 * mstsc.js is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 (function() {
21
22 /**
23 * decompress bitmap from RLE algorithm
24 * @param bitmap {object} bitmap object of bitmap event of node-rdpjs
25 */
26 function decompress (bitmap) {
27 var fName = null;
28 switch (bitmap.bitsPerPixel) {
29 case 15:
30 fName = 'bitmap_decompress_15';
31 break;
32 case 16:
33 fName = 'bitmap_decompress_16';
34 break;
35 case 24:
36 fName = 'bitmap_decompress_24';
37 break;
38 case 32:
39 fName = 'bitmap_decompress_32';
40 break;
41 default:
42 throw 'invalid bitmap data format';
43 }
44
45 var input = new Uint8Array(bitmap.data);
46 var inputPtr = Module._malloc(input.length);
47 var inputHeap = new Uint8Array(Module.HEAPU8.buffer, inputPtr, input.length);
48 inputHeap.set(input);
49
50 var output_width = bitmap.destRight - bitmap.destLeft + 1;
51 var output_height = bitmap.destBottom - bitmap.destTop + 1;
52 var ouputSize = output_width * output_height * 4;
53 var outputPtr = Module._malloc(ouputSize);
54
55 var outputHeap = new Uint8Array(Module.HEAPU8.buffer, outputPtr, ouputSize);
56
57 var res = Module.ccall(fName,
58 'number',
59 ['number', 'number', 'number', 'number', 'number', 'number', 'number', 'number'],
60 [outputHeap.byteOffset, output_width, output_height, bitmap.width, bitmap.height, inputHeap.byteOffset, input.length]
61 );
62
63 var output = new Uint8ClampedArray(outputHeap.buffer, outputHeap.byteOffset, ouputSize);
64
65 Module._free(inputPtr);
66 Module._free(outputPtr);
67
68 return { width : output_width, height : output_height, data : output };
69 }
70
71 /**
72 * Un compress bitmap are reverse in y axis
73 */
74 function reverse (bitmap) {
75 return { width : bitmap.width, height : bitmap.height, data : new Uint8ClampedArray(bitmap.data) };
76 }
77
78 /**
79 * Canvas renderer
80 * @param canvas {canvas} use for rendering
81 */
82 function Canvas(canvas) {
83 this.canvas = canvas;
84 this.ctx = canvas.getContext("2d");
85 }
86
87 Canvas.prototype = {
88 /**
89 * update canvas with new bitmap
90 * @param bitmap {object}
91 */
92 update : function (bitmap) {
93 var output = null;
94 if (bitmap.isCompress) {
95 output = decompress(bitmap);
96 }
97 else {
98 output = reverse(bitmap);
99 }
100
101 // use image data to use asm.js
102 var imageData = this.ctx.createImageData(output.width, output.height);
103 imageData.data.set(output.data);
104 this.ctx.putImageData(imageData, bitmap.destLeft, bitmap.destTop);
105 }
106 }
107
108 /**
109 * Module export
110 */
111 Mstsc.Canvas = {
112 create : function (canvas) {
113 return new Canvas(canvas);
114 }
115 }
116 })();