<!DOCTYPE html> <html> <head> <title>BMP To Canvas</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta name="viewport" content="width=device-width"> </head> <body> <input type="file" id="input"> <canvas id="canvas1" width="128" height="128"> This text is displayed if your browser does not support HTML5 Canvas. </canvas> <script> var inputElement = document.getElementById("input"); inputElement.addEventListener("change", handleFiles, false); var canvas1 = document. getElementById('canvas1'); var ctx1 = canvas1.getContext('2d'); function handleFiles(e) { var file = e.target.files[0]; var reader = new FileReader(); reader.addEventListener("load", processimage, false); reader.readAsArrayBuffer(file); }
function processimage(e) { var buffer = e.target.result; var bitmap = getBMP(buffer); var imageData = convertToImageData(bitmap); ctx1.putImageData(imageData, 0, 0); }
function getBMP(buffer) { var datav = new DataView(buffer); var bitmap = {}; bitmap.fileheader = {}; bitmap.fileheader.bfType = datav.getUint16(0, true); bitmap.fileheader.bfSize = datav.getUint32(2, true); bitmap.fileheader.bfReserved1 = datav.getUint16(6, true); bitmap.fileheader.bfReserved2 = datav.getUint16(8, true); bitmap.fileheader.bfOffBits = datav.getUint32(10, true);
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QuickSort was published in July 1961 and so is celebrating its 60th birthday. QuickSort is the most elegant of algorithms and every programmer should study it. It is also subtle and this often m [ ... ]