Media: Optimize Imagick settings for quality and filesize

- Resamples and sharpens larger images before resize.
- Uses imagick::FILTER_TRIANGLE for a smoother resize.
- Introduces `WP_Image_Editor_Imagick::thumbnail_image()` protected method to efficiently resize images. Similar to the functionality of Imagick's `thumbnailImage()`.
- Introduces `WP_Image_Editor_Imagick::strip_meta()` protected method and `image_strip_meta` filter that, by default, strip image profiles to reduce file size, while leaving color profiles intact.

See: #33642, #30402, #28634.
Props: joemcgill, dnewton, mikeschroder.
Built from https://develop.svn.wordpress.org/trunk@36700


git-svn-id: http://core.svn.wordpress.org/trunk@36667 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Mike Schroder 2016-02-24 22:51:26 +00:00
parent 5ec9a2aeb4
commit 2656dff5ad
2 changed files with 176 additions and 9 deletions

View File

@ -62,20 +62,25 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
'writeimage',
'getimageblob',
'getimagegeometry',
'getimagedepth',
'getimageformat',
'setimageformat',
'setimagecompression',
'setimagecompressionquality',
'setimagedepth',
'setimagepage',
'setimageproperty',
'setinterlacescheme',
'scaleimage',
'cropimage',
'rotateimage',
'flipimage',
'flopimage',
'unsharpmaskimage',
);
// Now, test for deep requirements within Imagick.
if ( ! defined( 'imagick::COMPRESSION_JPEG' ) )
if ( ! ( defined( 'imagick::COMPRESSION_JPEG' ) && defined( 'imagick::FILTER_TRIANGLE' ) ) )
return false;
if ( array_diff( $required_methods, get_class_methods( 'Imagick' ) ) )
@ -249,18 +254,131 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
return $this->crop( $src_x, $src_y, $src_w, $src_h, $dst_w, $dst_h );
}
try {
// Execute the resize
$thumb_result = $this->thumbnail_image( $dst_w, $dst_h );
if ( is_wp_error( $thumb_result ) ) {
return $thumb_result;
}
return $this->update_size( $dst_w, $dst_h );
}
/**
* @TODO: Thumbnail is more efficient, given a newer version of Imagemagick.
* $this->image->thumbnailImage( $dst_w, $dst_h );
* Efficiently resize the current image
*
* This is a WordPress specific implementation of Imagick::thumbnailImage(),
* which resizes an image to given dimensions and removes any associated profiles.
*
* @since 4.5.0
* @access protected
*
* @param int $dst_w The destination width.
* @param int $dst_h The destination height.
* @param string $filter_name Optional. The Imagick filter to use when resizing. Default 'FILTER_TRIANGLE'.
* @param bool $strip_meta Optional. Strip all profiles, excluding color profiles, from the image. Default true.
* @return bool|WP_Error
*/
$this->image->scaleImage( $dst_w, $dst_h );
protected function thumbnail_image( $dst_w, $dst_h, $filter_name = 'FILTER_TRIANGLE', $strip_meta = true ) {
$allowed_filters = array(
'FILTER_POINT',
'FILTER_BOX',
'FILTER_TRIANGLE',
'FILTER_HERMITE',
'FILTER_HANNING',
'FILTER_HAMMING',
'FILTER_BLACKMAN',
'FILTER_GAUSSIAN',
'FILTER_QUADRATIC',
'FILTER_CUBIC',
'FILTER_CATROM',
'FILTER_MITCHELL',
'FILTER_LANCZOS',
'FILTER_BESSEL',
'FILTER_SINC',
);
/**
* Set the filter value if '$filter_name' name is in our whitelist and the related
* Imagick constant is defined or fall back to our default filter.
*/
if ( in_array( $filter_name, $allowed_filters ) && defined( 'Imagick::' . $filter_name ) ) {
$filter = constant( 'Imagick::' . $filter_name );
} else {
$filter = Imagick::FILTER_TRIANGLE;
}
/**
* Filter to override stripping metadata from images when they're resized.
*
* This filter only applies when resizing using the Imagick editor since GD
* always strips profiles by default.
*
* @since 4.5.0
*
* @param bool $strip_meta Whether to strip image metadata during resizing. Default true.
*/
$strip_meta = apply_filters( 'image_strip_meta', $strip_meta );
// Strip image meta.
if ( $strip_meta ) {
$strip_result = $this->strip_meta();
if ( is_wp_error( $strip_result ) ) {
return $strip_result;
}
}
try {
/*
* To be more efficient, resample large images to 5x the destination size before resizing
* whenever the output size is less that 1/3 of the original image size (1/3^2 ~= .111),
* unless we would be resampling to a scale smaller than 128x128.
*/
$resize_ratio = ( $dst_w / $this->size['width'] ) * ( $dst_h / $this->size['height'] );
$sample_factor = 5;
if ( $resize_ratio < .111 && ( $dst_w * $sample_factor > 128 && $dst_h * $sample_factor > 128 ) ) {
$this->image->sampleImage( $dst_w * $sample_factor, $dst_h * $sample_factor );
}
// Resize to the final output size.
$this->image->setOption( 'filter:support', '2.0' );
$this->image->resizeImage( $dst_w, $dst_h, $filter, 1 );
// Set appropriate quality settings after resizing.
if ( 'image/jpeg' == $this->mime_type ) {
$this->image->unsharpMaskImage( 0.25, 0.25, 8, 0.065 );
$this->image->setOption( 'jpeg:fancy-upsampling', 'off' );
}
if ( 'image/png' === $this->mime_type ) {
$this->image->setOption( 'png:compression-filter', '5' );
$this->image->setOption( 'png:compression-level', '9' );
$this->image->setOption( 'png:compression-strategy', '1' );
$this->image->setOption( 'png:exclude-chunk', 'all' );
}
/**
* If alpha channel is not defined, set it opaque.
*
* Note that Imagick::getImageAlphaChannel() is only available if Imagick
* has been compiled against ImageMagick version 6.4.0 or newer.
*/
if ( method_exists( $this->image, 'getImageAlphaChannel') && $this->image->getImageAlphaChannel() === Imagick::ALPHACHANNEL_UNDEFINED ) {
$this->image->setImageAlphaChannel( Imagick::ALPHACHANNEL_OPAQUE );
}
// Limit the bit depth of resized images to 8 bits per channel.
if ( 8 < $this->image->getImageDepth() ) {
$this->image->setImageDepth( 8 );
}
$this->image->setInterlaceScheme( Imagick::INTERLACE_NO );
}
catch ( Exception $e ) {
return new WP_Error( 'image_resize_error', $e->getMessage() );
}
return $this->update_size( $dst_w, $dst_h );
}
/**
@ -367,7 +485,11 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
if ( ! $dst_h )
$dst_h = $src_h;
$this->image->scaleImage( $dst_w, $dst_h );
$thumb_result = $this->thumbnail_image( $dst_w, $dst_h );
if ( is_wp_error( $thumb_result ) ) {
return $thumb_result;
}
return $this->update_size();
}
}
@ -530,4 +652,49 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
return true;
}
/**
* Strip all image meta except color profiles from an image.
*
* @access protected
* @since 4.5.0
*/
protected function strip_meta() {
try {
// Strip profiles.
foreach ( $this->image->getImageProfiles( '*', true ) as $key => $value ) {
if ( $key != 'icc' && $key != 'icm' ) {
$this->image->removeImageProfile( $key );
}
}
// Strip image properties.
if ( method_exists( $this->image, 'deleteImageProperty' ) ) {
$this->image->deleteImageProperty( 'comment' );
$this->image->deleteImageProperty( 'Thumb::URI' );
$this->image->deleteImageProperty( 'Thumb::MTime' );
$this->image->deleteImageProperty( 'Thumb::Size' );
$this->image->deleteImageProperty( 'Thumb::Mimetype' );
$this->image->deleteImageProperty( 'software' );
$this->image->deleteImageProperty( 'Thumb::Image::Width' );
$this->image->deleteImageProperty( 'Thumb::Image::Height' );
$this->image->deleteImageProperty( 'Thumb::Document::Pages' );
} else {
$this->image->setImageProperty( 'comment', '' );
$this->image->setImageProperty( 'Thumb::URI', '' );
$this->image->setImageProperty( 'Thumb::MTime', '' );
$this->image->setImageProperty( 'Thumb::Size', '' );
$this->image->setImageProperty( 'Thumb::Mimetype', '' );
$this->image->setImageProperty( 'software', '' );
$this->image->setImageProperty( 'Thumb::Image::Width', '' );
$this->image->setImageProperty( 'Thumb::Image::Height', '' );
$this->image->setImageProperty( 'Thumb::Document::Pages', '' );
}
} catch ( Excpetion $e ) {
return new WP_Error( 'image_strip_meta_error', $e->getMessage() );
}
return true;
}
}

View File

@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.5-alpha-36699';
$wp_version = '4.5-alpha-36700';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.