IMGGenerator.php

<?php
require 'vendor/autoload.php';

use Picqer\Barcode\BarcodeGeneratorPNG;
/**
* 图片处理类
1.生成条码图片
2.转换条码图片为 1bit bmp
*/
class IMGGenerator
{
    public $imagePath = 'D:/WWW/printer/images/';//图片存储路径
    public $barcode = '';
    private $barcodeWidth = 2.8;
    private $barcodeHeight = 80;
    public $errors = [];
    public function __construct($barcode)
    {
        $this->barcode = $barcode;
    }
    public function generateBarCode()
    {
        $generator = new BarcodeGeneratorPNG();
        $width = $this->barcodeWidth;
        $height = $this->barcodeHeight;
        $imagePng  = $generator->getBarcode($this->barcode, $generator::TYPE_CODE_39, $width,$height);
        $filename = $this->barcode.'.png';
        $bytes = file_put_contents($this->imagePath.$filename, $imagePng);
        if($bytes){
            return $this->imagePath.$filename;
        }else{
            $this->setError('png图片生成失败');
            return false;
        }
    }
    public function getBmpImagePath()
    {
        $pngFile  = $this->generateBarCode();
        $resource = imagecreatefrompng($pngFile);
        $bmpName = $this->imagePath.$this->barcode.'.bmp';
        $image = $this->imagebmp($resource,$bmpName,1,1);
        return $bmpName;
    }
    public function imagebmp($im, $filename = '', $bit = 8, $compression = 0)
    {
        if (!in_array($bit, array(1, 4, 8, 16, 24, 32)))
        {
            $bit = 8;
        }
        else if ($bit == 32) // todo:32 bit
        {
            $bit = 24;
        }
        $bits = pow(2, $bit);
     
        // 调整调色板
        imagetruecolortopalette($im, true, $bits);
        $width  = imagesx($im);
        $height = imagesy($im);

        $colors_num = imagecolorstotal($im);
     
        if ($bit <= 8)
        {
            // 颜色索引
            $rgb_quad = '';
            for ($i = 0; $i < $colors_num; $i ++)
            {
                $colors = imagecolorsforindex($im, $i);
                $rgb_quad .= chr($colors['blue']) . chr($colors['green']) . chr($colors['red']) . "\0";
            }
     
            // 位图数据
            $bmp_data = '';
     
            // 非压缩
            if ($compression == 0 || $bit < 8)
            {
                if (!in_array($bit, array(1, 4, 8)))
                {
                $bit = 8;
                }
                $compression = 0;
                 
                // 每行字节数必须为4的倍数，补齐。
                $extra = '';
                $padding = 4 - ceil($width / (8 / $bit)) % 4;
                if ($padding % 4 != 0)
                {
                $extra = str_repeat("\0", $padding);
                }
     
                for ($j = $height - 1; $j >= 0; $j --)
                {
                    $i = 0;
                    while ($i < $width)
                    {
                        $bin = 0;
                        $limit = $width - $i < 8 / $bit ? (8 / $bit - $width + $i) * $bit : 0;
     
                        for ($k = 8 - $bit; $k >= $limit; $k -= $bit)
                        {
                            $index = imagecolorat($im, $i, $j);
                            $bin |= $index << $k;
                            $i ++;
                        }
     
                        $bmp_data .= chr($bin);
                    }
     
                    $bmp_data .= $extra;
                }
            }
            // RLE8 压缩
            else if ($compression == 1 && $bit == 8)
            {
                for ($j = $height - 1; $j >= 0; $j --)
                {
                    $last_index = "\0";
                    $same_num   = 0;
                    for ($i = 0; $i <= $width; $i ++)
                    {
                        $index = imagecolorat($im, $i, $j);
                        if ($index !== $last_index || $same_num > 255)
                        {
                            if ($same_num != 0)
                            {
                                $bmp_data .= chr($same_num) . chr($last_index);
                            }
     
                            $last_index = $index;
                            $same_num = 1;
                        }
                        else
                        {
                        $same_num ++;
                        }
                    }
     
                    $bmp_data .= "\0\0";
                }
     
                $bmp_data .= "\0\1";
            }
            $size_quad = strlen($rgb_quad);
            $size_data = strlen($bmp_data);
        }
        else
        {
        // 每行字节数必须为4的倍数，补齐。
            $extra = '';
            $padding = 4 - ($width * ($bit / 8)) % 4;
            if ($padding % 4 != 0)
            {
                $extra = str_repeat("\0", $padding);
            }
            // 位图数据
            $bmp_data = '';
            for ($j = $height - 1; $j >= 0; $j --)
            {
                for ($i = 0; $i < $width; $i ++)
                {
                    $index  = imagecolorat($im, $i, $j);
                    $colors = imagecolorsforindex($im, $index);
                    if ($bit == 16)
                    {
                        $bin = 0 << $bit;
     
                        $bin |= ($colors['red'] >> 3) << 10;
                        $bin |= ($colors['green'] >> 3) << 5;
                        $bin |= $colors['blue'] >> 3;
     
                        $bmp_data .= pack("v", $bin);
                    }
                    else
                    {
                        $bmp_data .= pack("c*", $colors['blue'], $colors['green'], $colors['red']);
                    }
     
                    // todo: 32bit;
                }
                $bmp_data .= $extra;
            }
            $size_quad = 0;
            $size_data = strlen($bmp_data);
            $colors_num = 0;
        }
     
        // 位图文件头
        $file_header = "BM" . pack("V3", 54 + $size_quad + $size_data, 0, 54 + $size_quad);
     
        // 位图信息头
        $info_header = pack("V3v2V*", 0x28, $width, $height, 1, $bit, $compression, $size_data, 0, 0, $colors_num, 0);
     
        // 写入文件
        if ($filename != '')
        {
            $fp = fopen($filename, "wb");
            fwrite($fp, $file_header);
            fwrite($fp, $info_header);
            fwrite($fp, $rgb_quad);
            fwrite($fp, $bmp_data);
            fclose($fp);        
            return true;
        }
     
        // 浏览器输出
        header("Content-Type: image/bmp");
        echo $file_header . $info_header;
        echo $rgb_quad;
        echo $bmp_data;
        return true;
    }
    public function setError($error)
    {
        $this->errors[] = $error;
    }
}


?>