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