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      解決dedecms(5.6/5.7)縮略圖縮放變形問題方法

      時間:2020-11-04來源:www.1999hs.com作者:電腦系統城

      解決dedecms(5.6/5.7)縮略圖縮放變形問題方法,我們知道,dedecms縮略圖是自動提取,相當于原圖的等比例縮放了,比如后臺設置縮略圖的尺碼為:120*90即為3:2的圖片,但是假如內容里的大圖尺碼為300*300即1:1,這樣生成出來的圖片就會變形,直接后臺設置的縮略圖大小不起作用啊,這樣嚴重影響網站美觀,本文介紹通過修改dedecms生成縮略源碼方法解決定問題。

      打開include/image.func.php文件,該文件在dedecms5.6/5.7中所在的目錄不一樣,5.6中文件在/include/下,5.7中文件在/include/helpers/

      如果你使用的是dedecms5.7,打開目錄/include/helpers/找到image.helper.php文件。
      如果你使用的是dedecms5.6,打開目錄/include/找到image.func.php文件。

      5.6版image.func.php修改方法(直接替換原來方法)

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      //[2020-11-04]:解決縮略圖縮放變形問題(寬度、高度為后臺設置寬高)
      function ImageResize($srcFile, $toW, $toH, $toFile = "") {
          global $cfg_photo_type;
          if ($toFile == "") {
              $toFile = $srcFile;
          }
          $info = "";
          $srcInfo = GetImageSize($srcFile, $info);
          switch ($srcInfo[2]) {
          case 1:
              if (!$cfg_photo_type['gif']) {
                  return false;
              }
              $im = imagecreatefromgif($srcFile);
              break;
          case 2:
              if (!$cfg_photo_type['jpeg']) {
                  return false;
              }
              $im = imagecreatefromjpeg($srcFile);
              break;
          case 3:
              if (!$cfg_photo_type['png']) {
                  return false;
              }
              $im = imagecreatefrompng($srcFile);
              break;
          case 6:
              if (!$cfg_photo_type['bmp']) {
                  return false;
              }
              $im = imagecreatefromwbmp($srcFile);
              break;
          }
          $srcW = ImageSX($im);
          $srcH = ImageSY($im);
          if ($srcW <= $toW && $srcH <= $toH) {
              return true;
          }
          //縮略生成并裁剪
          $newW = $toH * $srcW / $srcH;
          $newH = $toW * $srcH / $srcW;
          if ($newH >= $toH) {
              $ftoW = $toW;
              $ftoH = $newH;
          } else {
              $ftoW = $newW;
              $ftoH = $toH;
          }
          if ($srcW > $toW || $srcH > $toH) {
              if (function_exists("imagecreatetruecolor")) {
                  @$ni = imagecreatetruecolor($ftoW, $ftoH);
                  if ($ni) {
                      imagecopyresampled($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
                  } else {
                      $ni = imagecreate($ftoW, $ftoH);
                      imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
                  }
              } else {
                  $ni = imagecreate($ftoW, $ftoH);
                  imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
              }
              //裁剪圖片成標準縮略圖
              $new_imgx = imagecreatetruecolor($toW, $toH);
              if ($newH >= $toH) {
                  imagecopyresampled($new_imgx, $ni, 0, 0, 0, ($newH - $toH) / 2, $toW, $toH, $toW, $toH);
              } else {
                  imagecopyresampled($new_imgx, $ni, 0, 0, ($newW - $toW) / 2, 0, $toW, $toH, $toW, $toH);
              }
              switch ($srcInfo[2]) {
              case 1:
                  imagegif($new_imgx, $toFile);
                  break;
              case 2:
                  imagejpeg($new_imgx, $toFile, 85);
                  break;
              case 3:
                  imagepng($new_imgx, $toFile);
                  break;
              case 6:
                  imagebmp($new_imgx, $toFile);
                  break;
              default:
                  return false;
              }
              imagedestroy($new_imgx);
              imagedestroy($ni);
          }
          imagedestroy($im);
          return true;
      }

      5.7版image.helper.php修改方法

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      if (!function_exists('ImageResize')) {
          function ImageResize($srcFile, $toW, $toH, $toFile = "") {
              global $cfg_photo_type;
              if ($toFile == "") {
                  $toFile = $srcFile;
              }
              $info = "";
              $srcInfo = GetImageSize($srcFile, $info);
              switch ($srcInfo[2]) {
              case 1:
                  if (!$cfg_photo_type['gif']) {
                      return false;
                  }
                  $im = imagecreatefromgif($srcFile);
                  break;
              case 2:
                  if (!$cfg_photo_type['jpeg']) {
                      return false;
                  }
                  $im = imagecreatefromjpeg($srcFile);
                  break;
              case 3:
                  if (!$cfg_photo_type['png']) {
                      return false;
                  }
                  $im = imagecreatefrompng($srcFile);
                  break;
              case 6:
                  if (!$cfg_photo_type['bmp']) {
                      return false;
                  }
                  $im = imagecreatefromwbmp($srcFile);
                  break;
              }
              $srcW = ImageSX($im);
              $srcH = ImageSY($im);
              if ($srcW <= $toW && $srcH <= $toH) {
                  return true;
              }
              //縮略生成并裁剪
              $newW = $toH * $srcW / $srcH;
              $newH = $toW * $srcH / $srcW;
              if ($newH >= $toH) {
                  $ftoW = $toW;
                  $ftoH = $newH;
              } else {
                  $ftoW = $newW;
                  $ftoH = $toH;
              }
              if ($srcW > $toW || $srcH > $toH) {
                  if (function_exists("imagecreatetruecolor")) {
              @$ni = imagecreatetruecolor($ftoW, $ftoH);
                      if ($ni) {
                          imagecopyresampled($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
                      } else {
                          $ni = imagecreate($ftoW, $ftoH);
                          imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
                      }
                  } else {
                      $ni = imagecreate($ftoW, $ftoH);
                      imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
                  }
                  //裁剪圖片成標準縮略圖
                  $new_imgx = imagecreatetruecolor($toW, $toH);
                  if ($newH >= $toH) {
                      imagecopyresampled($new_imgx, $ni, 0, 0, 0, ($newH - $toH) / 2, $toW, $toH, $toW, $toH);
                  } else {
                      imagecopyresampled($new_imgx, $ni, 0, 0, ($newW - $toW) / 2, 0, $toW, $toH, $toW, $toH);
                  }
                  switch ($srcInfo[2]) {
                  case 1:
                      imagegif($new_imgx, $toFile);
                      break;
                  case 2:
                      imagejpeg($new_imgx, $toFile, 85);
                      break;
                  case 3:
                      imagepng($new_imgx, $toFile);
                      break;
                  case 6:
                      imagebmp($new_imgx, $toFile);
                      break;
                  default:
                      return false;
                  }
                  imagedestroy($new_imgx);
                  imagedestroy($ni);
              }
              imagedestroy($im);
              return true;
          }
      }

      到此這篇關于解決dedecms(5.6/5.7)縮略圖縮放變形問題方法的文章就介紹到這了

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