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php图片水印类支持水印透明与背景透明

时间：2021-07-01 10:21:17 帮助过：32人阅读

  3. /**

  4. * 加水印类，支持文字图片水印的透明度设置、水印图片背景透明。
  5. * 日期：2011-09-27
  6. * 作者：bbs.it-home.org
  7. * 使用：
  8. * $obj = new WaterMask($imgFileName); //实例化对象
  9. * $obj->$waterType = 1; //类型：0为文字水印、1为图片水印
  10. * $obj->$transparent = 45; //水印透明度
  11. * $obj->$waterStr = 'bbs.it-home.org'; //水印文字
  12. * $obj->$fontSize = 16; //文字字体大小
  13. * $obj->$fontColor = array(255,0255); //水印文字颜色（RGB）
  14. * $obj->$fontFile = = 'AHGBold.ttf'; //字体文件
  15. * $obj->output(); //输出水印图片文件覆盖到输入的图片文件
  16. */
  17. class WaterMask{
  18. public $waterType = 1; //水印类型：0为文字水印、1为图片水印
  19. public $pos = 0; //水印位置
  20. public $transparent = 45; //水印透明度
  21. public $waterStr = 'bbs.it-home.org'; //水印文字
  22. public $fontSize = 16; //文字字体大小
  23. public $fontColor = array(255,0,255); //水印文字颜色（RGB）
  24. public $fontFile = 'AHGBold.ttf'; //字体文件
  25. public $waterImg = 'logo.png'; //水印图片
  26. private $srcImg = ''; //需要添加水印的图片
  27. private $im = ''; //图片句柄
  28. private $water_im = ''; //水印图片句柄
  29. private $srcImg_info = ''; //图片信息
  30. private $waterImg_info = ''; //水印图片信息
  31. private $str_w = ''; //水印文字宽度
  32. private $str_h = ''; //水印文字高度
  33. private $x = ''; //水印X坐标
  34. private $y = ''; //水印y坐标

  35. function __construct($img) { //析构函数

  36. $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
  37. }
  38. private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。
  39. $this->srcImg_info = getimagesize($this->srcImg);
  40. switch ($this->srcImg_info[2]) {
  41. case 3:
  42. $this->im = imagecreatefrompng($this->srcImg);
  43. break 1;
  44. case 2:
  45. $this->im = imagecreatefromjpeg($this->srcImg);
  46. break 1;
  47. case 1:
  48. $this->im = imagecreatefromgif($this->srcImg);
  49. break 1;
  50. default:
  51. die('原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
  52. }
  53. }
  54. private function waterimginfo() { //获取水印图片的信息，并载入图片。
  55. $this->waterImg_info = getimagesize($this->waterImg);
  56. switch ($this->waterImg_info[2]) {
  57. case 3:
  58. $this->water_im = imagecreatefrompng($this->waterImg);
  59. break 1;
  60. case 2:
  61. $this->water_im = imagecreatefromjpeg($this->waterImg);
  62. break 1;
  63. case 1:
  64. $this->water_im = imagecreatefromgif($this->waterImg);
  65. break 1;
  66. default:
  67. die('水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
  68. }
  69. }
  70. private function waterpos() { //水印位置算法
  71. switch ($this->pos) {
  72. case 0: //随机位置
  73. $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
  74. $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
  75. break 1;
  76. case 1: //上左
  77. $this->x = 0;
  78. $this->y = 0;
  79. break 1;
  80. case 2: //上中
  81. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  82. $this->y = 0;
  83. break 1;
  84. case 3: //上右
  85. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  86. $this->y = 0;
  87. break 1;
  88. case 4: //中左
  89. $this->x = 0;
  90. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  91. break 1;
  92. case 5: //中中
  93. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  94. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  95. break 1;
  96. case 6: //中右
  97. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  98. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  99. break 1;
  100. case 7: //下左
  101. $this->x = 0;
  102. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  103. break 1;
  104. case 8: //下中
  105. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  106. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  107. break 1;
  108. default: //下右
  109. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  110. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  111. break 1;
  112. }
  113. }
  114. private function waterimg() {
  115. if ($this->srcImg_info[0] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){
  116. die('水印比原图大！');
  117. }
  118. $this->waterpos();
  119. $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
  120. imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
  121. $pct = $this->transparent;
  122. imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
  123. imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
  124. }
  125. private function waterstr() {
  126. $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
  127. $w = abs($rect[2]-$rect[6]);
  128. $h = abs($rect[3]-$rect[7]);
  129. $fontHeight = $this->fontSize;
  130. $this->water_im = imagecreatetruecolor($w, $h);
  131. imagealphablending($this->water_im,false);
  132. imagesavealpha($this->water_im,true);
  133. $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
  134. imagefill($this->water_im,0,0,$white_alpha);
  135. $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
  136. imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
  137. $this->waterImg_info = array(0=>$w,1=>$h);
  138. $this->waterimg();
  139. }
  140. function output() {
  141. $this->imginfo();
  142. if ($this->waterType == 0) {
  143. $this->waterstr();
  144. }else {
  145. $this->waterimginfo();
  146. $this->waterimg();
  147. }
  148. switch ($this->srcImg_info[2]) {
  149. case 3:
  150. imagepng($this->im,$this->srcImg);
  151. break 1;
  152. case 2:
  153. imagejpeg($this->im,$this->srcImg);
  154. break 1;
  155. case 1:
  156. imagegif($this->im,$this->srcImg);
  157. break 1;
  158. default:
  159. die('添加水印失败！');
  160. break;
  161. }
  162. imagedestroy($this->im);
  163. imagedestroy($this->water_im);
  164. }
  165. }
  166. ?>

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