[转载]解决dedecms(5.6/5.7)缩略图缩放变形问题方法

织梦教程 强烈建议 2024-06-16 10:38 226 0

  解决dedecms(5.6/5.7)缩略图缩放变形问题方法,我们知道,dedecms缩略图是自动提取,相当于原图的等比例缩放了,比如后台设置缩略图的尺码为:120*90即为3:2的图片,但是假如内容里的大图尺码为300*300即1:1,这样生成出来的图片就会变形,直接后台设置的缩略图大小不起作用啊,这样严重影响网站美观,本文介绍通过修改dedecms生成缩略源码方法解决定问题。

  打开include/image.func.php文件,该文件在dedecms5.6/5.7中所在的目录不一样,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,打开目录/include/helpers/找到image.helper.php文件。

  如果你使用的是dedecms5.6,打开目录/include/找到image.func.php文件。

  dedecms5.6版image.func.php修改方法(直接替换原来方法)

  //[2020-11-04]:解决缩略图缩放变形问题(宽度、高度为后台设置宽高)

  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;

  }

  //缩略生成并裁剪

  $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);

  }

  //裁剪图片成标准缩略图

  $new_imgx = imagecreatetruecolor($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;

  }

  //[2020-11-04]:解决缩略图缩放变形问题(宽度、高度为后台设置宽高)

  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;

  }

  //缩略生成并裁剪

  $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);

  }

  //裁剪图片成标准缩略图

  $new_imgx = imagecreatetruecolor($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;

  }

  dedecms5.7版image.helper.php修改方法:

  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;

  }

  //缩略生成并裁剪

  $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);

  }

  //裁剪图片成标准缩略图

  $new_imgx = imagecreatetruecolor($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;

  }

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