/**
* 缩略（放大）图片
* @param int $thumbWidth 缩放的最大宽度
* @param int $thumbHeight 缩放的最大高度
* @param bool $magnify 是否允许放大图片
* @return bool 成功返回true，失败返回false
*/
public function resize($thumbWidth = 0, $thumbHeight = 0, $magnify = true)
{
$width = $this->getWidth();
$height = $this->getHeight();
do {
//定宽缩放
if ($thumbHeight === 0) {
$thumbHeight = $thumbWidth / $width * $height;
break;
}
//定高缩放
if ($thumbWidth === 0) {
$thumbWidth = $thumbHeight / $height * $width;
break;
}
//等比例缩放
if ($width / $thumbWidth > $height / $thumbHeight) {
$ratio = $thumbWidth / $width;
} else {
$ratio = $thumbHeight / $height;
}
$thumbWidth = $width * $ratio;
$thumbHeight = $height * $ratio;
} while (0);
//由于图片是等比率的，所以只需判断一条边
if (!$magnify && $thumbWidth >= $width) {
return true;
}
MagickSetImageCompressionQuality(self::$resource, 90);
//1-100值越大，越清晰
return MagickScaleImage(self::$resource, $thumbWidth, $thumbHeight);
}
private function createAndUploadImageDimensionMap(Image $image, $dimensionsKeyname)
{
$imd = $this->getDimensionByKeyname($dimensionsKeyname);
$srcPth = $this->imagesRoot . $image->FilePath;
if (file_exists($srcPth)) {
$tempPath = tempnam(sys_get_temp_dir(), 'img_');
if ($dimensionsKeyname == 'original') {
$s3Path = $srcPth;
$pts = getimagesize($s3Path);
$width = $pts[0];
$height = $pts[1];
$newDims = array('x' => $width, 'y' => $height);
$s3Path = $srcPth;
} else {
//need to redimension this image, using MagickWand
$magick_wand = NewMagickWand();
MagickReadImage($magick_wand, $srcPth);
$width = MagickGetImageWidth($magick_wand);
$height = MagickGetImageHeight($magick_wand);
$newDims = $this->getNewDimensionsPreservingAspectRatio($width, $height, $imd->Width, $imd->Height);
MagickScaleImage($magick_wand, $newDims['x'], $newDims['y']);
MagickWriteImage($magick_wand, $tempPath);
$s3Path = $tempPath;
}
$headers = array();
//This holds the http headers for our S3 object.
switch ($image->ImageType) {
case 'GIF':
$headers['Content-Type'] = 'image/gif';
break;
case 'JPG':
$headers['Content-Type'] = 'image/jpeg';
break;
case 'PNG':
$headers['Content-Type'] = 'image/png';
break;
default:
throw new Exception("Unrecognized type {$image->getType()}");
break;
}
//A "Far Future" expiration - maximizing the chance that the user's web browser will use
//a cached version rather than requesting the file from Cloudfront.
//Also set to public (as recommended by Google Speed Tracer), so that caching will work when
//using SSL as well. Even though Cloudfont doesn't support ssl today, someday it will
//and we will be prepared!
$headers['Cache-Control'] = 'public, max-age=315360000';
//10 years
$imDimMap = new ImageDimensionsMap();
$imDimMap->ImageId = $image->Id;
$imDimMap->ImageDimensionsId = $imd->Id;
$imDimMap->Width = $newDims['x'];
$imDimMap->Height = $newDims['y'];
$imDimMap->Version = $image->Version;
$imDimMap->save();
//upload the new file to S3
try {
$acl = S3Service::ACL_PUBLIC_READ;
if (!file_exists($tempPath)) {
throw new Exception("{$tempPath} dosn't exist");
}
$res = $this->s3->putObject(S3Service::inputFile($s3Path, true), $this->bucket, $this->getPath($image, $imDimMap, $imd), $acl, array(), $headers);
if ($res) {
unlink($tempPath);
} else {
//something's wrong. Fail silently and just leave the old version if it exists.
//Don't throw an exception or raise a failure, because there's a user on the other side
//of this request waiting to see this image.
$imDimMap->Version = $imDimMap->Version - 1;
$imDimMap->save();
}
} catch (Exception $e) {
//something's wrong. Fail silently and just leave the old version if it exist.
//Don't throw an exception or raise a failure, because there's a user on the other side
//of this request waiting to see this image.
$imDimMap->Version = $imDimMap->Version - 1;
$imDimMap->save();
}
}
return $imDimMap;
}
function zoomImg($src, $dest, $width, $height)
{
$srcImgRes = NewMagickWand();
if (!MagickReadImage($srcImgRes, $src)) {
exit("Error MagickReadImage {$src}\n");
}
MagickScaleImage($srcImgRes, $width, $height);
MagickWriteImage($srcImgRes, $dest);
}
function createThumb($objWidth, $objHeight, $nmw = "")
{
$srcImage = $this->src_image_name;
if (!IsMagickWand($nmw)) {
$nmw = NewMagickWand();
MagickReadImage($nmw, $srcImage);
}
$srcImageWidth = MagickGetImageWidth($nmw);
$srcImageHeight = MagickGetImageHeight($nmw);
if ($objWidth == 0 || $objHeight == 0) {
$objWidth = $srcImageWidth;
$objHeight = $srcImageHeight;
}
if ($objWidth < $objHeight) {
$mu = $srcImageWidth / $objWidth;
$objHeight = ceil($srcImageHeight / $mu);
} else {
$mu = $srcImageHeight / $objHeight;
$objWidth = ceil($srcImageWidth / $mu);
}
MagickScaleImage($nmw, $objWidth, $objHeight);
$ndw = NewDrawingWand();
DrawComposite($ndw, MW_AddCompositeOp, 0, 0, $objWidth, $objHeight, $nmw);
$res = NewMagickWand();
MagickNewImage($res, $objWidth, $objHeight);
MagickDrawImage($res, $ndw);
MagickSetImageFormat($res, MagickGetImageFormat($nmw));
return $res;
}
