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added dynamic svg placeholder #39

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added dynamic svg placeholder #39

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26 changes: 24 additions & 2 deletions classes/class-a3-lazy-load.php
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Original file line number Diff line number Diff line change
Expand Up @@ -383,7 +383,7 @@ static function get_attachment_image_attributes( $attr ) {
if ( ! ( is_array( $A3_Lazy_Load->_skip_images_classes ) && preg_match( $skip_images_regex, 'class="'.$attr['class'].'"' ) ) && ! preg_match( "/src=.*lazy_placeholder.gif['\"]/s", 'src="'.$attr['src'].'"' ) ) {

$attr['data-src'] = $attr['src'];
$attr['src'] = $A3_Lazy_Load->_placeholder_url;
$attr['src'] = $A3_Lazy_Load->get_placeholder($attr['width'], $attr['height']);
$attr['class'] = 'lazy-hidden '. $attr['class'];
$attr['data-lazy-type'] = 'image';
if ( isset( $attr['srcset'] ) ) {
Expand All @@ -396,6 +396,18 @@ static function get_attachment_image_attributes( $attr ) {
return $attr;
}

protected function get_placeholder($width, $height){

if ( ! $width || !$height || !apply_filters( 'a3_lazy_load_svg_placeholder', false ) ) {
return $this->_placeholder_url;
}

$svg = '<svg xmlns="http://www.w3.org/2000/svg" width="'. $width . '" height="'. $height .'"/>';
$baseSvg = base64_encode( $svg );

return "data:image/svg+xml;base64," . $baseSvg;
}

protected function _filter_images( $content, $include_noscript = null ) {
global $a3_lazy_load_excludes;

Expand Down Expand Up @@ -424,8 +436,18 @@ protected function _filter_images( $content, $include_noscript = null ) {
if ( ! ( is_array( $this->_skip_images_classes ) && preg_match( $skip_images_regex, $imgHTML ) ) && ! preg_match( "/src=['\"]data:image/is", $imgHTML ) && ! preg_match( "/src=.*lazy_placeholder.gif['\"]/s", $imgHTML ) && ! $a3_lazy_load_excludes->has_skip_lazy_attribute( $imgHTML ) ) {
$i++;
// replace the src and add the data-src attribute

preg_match('/width="(.+?)"/', $imgHTML, $imgWidth);
preg_match('/height="(.+?)"/', $imgHTML, $imgHeight);

$placeholder = $this->_placeholder_url;

if ( isset( $imgWidth[1] ) && isset( $imgHeight[1] ) ) {
$placeholder = $this->get_placeholder( $imgWidth[1], $imgHeight[1] );
}

$replaceHTML = '';
$replaceHTML = preg_replace( '/<img(.*?)src=/is', '<img$1src="' . $this->_placeholder_url . '" data-lazy-type="image" data-src=', $imgHTML );
$replaceHTML = preg_replace( '/<img(.*?)src=/is', '<img$1src="' . $placeholder . '" data-lazy-type="image" data-src=', $imgHTML );
$replaceHTML = preg_replace( '/<img(.*?)srcset=/is', '<img$1srcset="" data-srcset=', $replaceHTML );

// add the lazy class to the img element
Expand Down