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Media: Only load first PDF page for thumbnails. 

To improve performance, directly load the first page of uploaded PDFs
to reduce the total clock time necessary to generate thumbnails.

Props dglingren, lukecavanagh, helen, johnbillion, mikeschroder.
See #38522.

git-svn-id: https://develop.svn.wordpress.org/trunk@39187 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Mike Schroder 2016-11-09 21:04:04 +00:00
parent 477e34fbf8
commit 28e538bf80
1 changed files with 5 additions and 1 deletions
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6
src/wp-includes/class-wp-image-editor-imagick.php
View File

@ -147,16 +147,20 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
try {
$this->image = new Imagick();
$file_parts = pathinfo( $this->file );
$filename = $this->file;
// By default, PDFs are rendered in a very low resolution.
// We want the thumbnail to be readable, so increase the rendering dpi.
if ( 'pdf' == strtolower( $file_parts['extension'] ) ) {
$this->image->setResolution( 128, 128 );
// Only load the first page.
$filename .= '[0]';
}
// Reading image after Imagick instantiation because `setResolution`
// only applies correctly before the image is read.
$this->image->readImage( $this->file );
$this->image->readImage( $filename );
if ( ! $this->image->valid() )
return new WP_Error( 'invalid_image', __('File is not an image.'), $this->file);