'test'

mh-two-thousand-and-two

2024-04-12 3d2ec2fd0578d3ba0a414b0cc4e4a2ae60878596

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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.writeInt32LE(-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 = 0; y <this.height; y++){
        for (var x = 0; x < this.width; x++){
            var p = this.pos+y*rowBytes+x*3;
            i++;//a
            tempBuffer[p]= this.buffer[i++];//b
            tempBuffer[p+1] = this.buffer[i++];//g
            tempBuffer[p+2]  = this.buffer[i++];//r
        }
        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
  };
};