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build/node_modules/bmp-js/lib/encoder.js

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+/**
+ * @author shaozilee
+ *
+ * BMP format encoder,encode 24bit BMP
+ * Not support quality compression
+ *
+ */
+
+function BmpEncoder(imgData){
+	this.buffer = imgData.data;
+	this.width = imgData.width;
+	this.height = imgData.height;
+	this.extraBytes = this.width%4;
+	this.rgbSize = this.height*(3*this.width+this.extraBytes);
+	this.headerInfoSize = 40;
+
+	this.data = [];
+	/******************header***********************/
+	this.flag = "BM";
+	this.reserved = 0;
+	this.offset = 54;
+	this.fileSize = this.rgbSize+this.offset;
+	this.planes = 1;
+	this.bitPP = 24;
+	this.compress = 0;
+	this.hr = 0;
+	this.vr = 0;
+	this.colors = 0;
+	this.importantColors = 0;
+}
+
+BmpEncoder.prototype.encode = function() {
+	var tempBuffer = new Buffer(this.offset+this.rgbSize);
+	this.pos = 0;
+	tempBuffer.write(this.flag,this.pos,2);this.pos+=2;
+	tempBuffer.writeUInt32LE(this.fileSize,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.reserved,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.offset,this.pos);this.pos+=4;
+
+	tempBuffer.writeUInt32LE(this.headerInfoSize,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.width,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.height,this.pos);this.pos+=4;
+	tempBuffer.writeUInt16LE(this.planes,this.pos);this.pos+=2;
+	tempBuffer.writeUInt16LE(this.bitPP,this.pos);this.pos+=2;
+	tempBuffer.writeUInt32LE(this.compress,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.rgbSize,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.hr,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.vr,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.colors,this.pos);this.pos+=4;
+	tempBuffer.writeUInt32LE(this.importantColors,this.pos);this.pos+=4;
+
+	var i=0;
+	var rowBytes = 3*this.width+this.extraBytes;
+
+	for (var y = this.height - 1; y >= 0; y--){
+		for (var x = 0; x < this.width; x++){
+			var p = this.pos+y*rowBytes+x*3;
+			tempBuffer[p+2]= this.buffer[i++];//r
+			tempBuffer[p+1] = this.buffer[i++];//g
+			tempBuffer[p]  = this.buffer[i++];//b
+			i++;
+		}
+		if(this.extraBytes>0){
+			var fillOffset = this.pos+y*rowBytes+this.width*3;
+			tempBuffer.fill(0,fillOffset,fillOffset+this.extraBytes);
+		}
+	}
+
+	return tempBuffer;
+};
+
+module.exports = function(imgData, quality) {
+  if (typeof quality === 'undefined') quality = 100;
+ 	var encoder = new BmpEncoder(imgData);
+	var data = encoder.encode();
+  return {
+    data: data,
+    width: imgData.width,
+    height: imgData.height
+  };
+};