/**
* 创建头像动态gif缩略图
* @param $imageSource
* @param $srcW
* @param $srcH
* @param $dstW
* @param $dstH
*/
function makeAvatarGifThumb($imageSource, $srcW, $srcH, $dstW, $dstH)
{
if ($srcW <= $dstW && $srcH <= $dstH) {
return $imageSource;
}
$imageSource = imagecreatefromstring($imageSource);
list($imagecreate, $imagecopyre) = GetImageCreate('gif');
if ($srcW / $dstW < $srcH / $dstH) {
$finalW = round($dstH / $srcH * $srcW);
$finalH = $dstH;
} elseif ($srcW / $dstW > $srcH / $dstH) {
$finalW = $dstW;
$finalH = round($dstW / $srcW * $srcH);
} else {
$finalW = $dstW;
$finalH = $dstH;
}
$thumb = $imagecreate($finalW, $finalH);
if (function_exists('ImageColorAllocate') && function_exists('ImageColorTransparent')) {
//背景透明处理
$black = ImageColorAllocate($thumb, 0, 0, 0);
$bgTransparent = ImageColorTransparent($thumb, $black);
}
$imagecopyre($thumb, $imageSource, 0, 0, 0, 0, $finalW, $finalH, $srcW, $srcH);
ob_start();
imagegif($thumb);
imagedestroy($thumb);
$imageStream = ob_get_contents();
ob_end_clean();
return $imageStream;
}
function modeImageThumb($srcFile, $dstFile, $dstX, $dstY)
{
$imgdata = array();
list($imgdata['width'], $imgdata['height'], $imgdata['type']) = getimagesize($srcFile);
switch ($imgdata['type']) {
case 1:
$imgdata['type'] = 'gif';
break;
case 2:
$imgdata['type'] = 'jpeg';
break;
case 3:
$imgdata['type'] = 'png';
break;
default:
return false;
}
if (!empty($imgdata) && function_exists('imagecreatefrom' . $imgdata['type'])) {
$imagecreatefromtype = 'imagecreatefrom' . $imgdata['type'];
} else {
return false;
}
$imgdata['source'] = $imagecreatefromtype($srcFile);
!$imgdata['width'] && ($imgdata['width'] = imagesx($imgdata['source']));
!$imgdata['height'] && ($imgdata['height'] = imagesy($imgdata['source']));
list($imagecreate, $imagecopyre) = GetImageCreate($imgdata['type']);
$thumb = $imagecreate($dstX, $dstY);
$color = @ImageColorAllocate($thumb, 255, 255, 255);
@imagefilledrectangle($thumb, 0, 0, $dstX, $dstY, $color);
$pX = $pY = $pW = $pH = 0;
if ($imgdata['width'] < $dstX && $imgdata['height'] < $dstY) {
$pW = $imgdata['width'];
$pH = $imgdata['height'];
} else {
if ($imgdata['width'] / $imgdata['height'] > $dstX / $dstY) {
$pW = $dstX;
$pH = round($dstX * $imgdata['height'] / $imgdata['width']);
} else {
$pH = $dstY;
$pW = round($dstY * $imgdata['width'] / $imgdata['height']);
}
}
$pX = round(($dstX - $pW) / 2);
$pY = round(($dstY - $pH) / 2);
$imagecopyre($thumb, $imgdata['source'], $pX, $pY, 0, 0, $pW, $pH, $imgdata['width'], $imgdata['height']);
MakeImage($imgdata['type'], $thumb, $dstFile);
imagedestroy($thumb);
return 1;
}
