*/
( function ( $ ) {
-/**
- * Get reported or approximate device pixel ratio.
- *
- * - 1.0 means 1 CSS pixel is 1 hardware pixel
- * - 2.0 means 1 CSS pixel is 2 hardware pixels
- * - etc.
- *
- * Uses `window.devicePixelRatio` if available, or CSS media queries on IE.
- *
- * @static
- * @inheritable
- * @return {number} Device pixel ratio
- */
-$.devicePixelRatio = function () {
- if ( window.devicePixelRatio !== undefined ) {
- // Most web browsers:
- // * WebKit (Safari, Chrome, Android browser, etc)
- // * Opera
- // * Firefox 18+
- return window.devicePixelRatio;
- } else if ( window.msMatchMedia !== undefined ) {
- // Windows 8 desktops / tablets, probably Windows Phone 8
- //
- // IE 10 doesn't report pixel ratio directly, but we can get the
- // screen DPI and divide by 96. We'll bracket to [1, 1.5, 2.0] for
- // simplicity, but you may get different values depending on zoom
- // factor, size of screen and orientation in Metro IE.
- if ( window.msMatchMedia( '(min-resolution: 192dpi)' ).matches ) {
+ /**
+ * Get reported or approximate device pixel ratio.
+ *
+ * - 1.0 means 1 CSS pixel is 1 hardware pixel
+ * - 2.0 means 1 CSS pixel is 2 hardware pixels
+ * - etc.
+ *
+ * Uses `window.devicePixelRatio` if available, or CSS media queries on IE.
+ *
+ * @static
+ * @inheritable
+ * @return {number} Device pixel ratio
+ */
+ $.devicePixelRatio = function () {
+ if ( window.devicePixelRatio !== undefined ) {
+ // Most web browsers:
+ // * WebKit/Blink (Safari, Chrome, Android browser, etc)
+ // * Opera
+ // * Firefox 18+
+ // * Microsoft Edge (Windows 10)
+ return window.devicePixelRatio;
+ } else if ( window.msMatchMedia !== undefined ) {
+ // Windows 8 desktops / tablets, probably Windows Phone 8
+ //
+ // IE 10/11 doesn't report pixel ratio directly, but we can get the
+ // screen DPI and divide by 96. We'll bracket to [1, 1.5, 2.0] for
+ // simplicity, but you may get different values depending on zoom
+ // factor, size of screen and orientation in Metro IE.
+ if ( window.msMatchMedia( '(min-resolution: 192dpi)' ).matches ) {
+ return 2;
+ } else if ( window.msMatchMedia( '(min-resolution: 144dpi)' ).matches ) {
+ return 1.5;
+ } else {
+ return 1;
+ }
+ } else {
+ // Legacy browsers...
+ // Assume 1 if unknown.
+ return 1;
+ }
+ };
+
+ /**
+ * Bracket a given device pixel ratio to one of [1, 1.5, 2].
+ *
+ * This is useful for grabbing images on the fly with sizes based on the display
+ * density, without causing slowdown and extra thumbnail renderings on devices
+ * that are slightly different from the most common sizes.
+ *
+ * The bracketed ratios match the default 'srcset' output on MediaWiki thumbnails,
+ * so will be consistent with default renderings.
+ *
+ * @static
+ * @inheritable
+ * @param {number} baseRatio Base ratio
+ * @return {number} Device pixel ratio
+ */
+ $.bracketDevicePixelRatio = function ( baseRatio ) {
+ if ( baseRatio > 1.5 ) {
return 2;
- } else if ( window.msMatchMedia( '(min-resolution: 144dpi)' ).matches ) {
+ } else if ( baseRatio > 1 ) {
return 1.5;
} else {
return 1;
}
- } else {
- // Legacy browsers...
- // Assume 1 if unknown.
- return 1;
- }
-};
+ };
-/**
- * Implement responsive images based on srcset attributes, if browser has no
- * native srcset support.
- *
- * @return {jQuery} This selection
- * @chainable
- */
-$.fn.hidpi = function () {
- var $target = this,
- // @todo add support for dpi media query checks on Firefox, IE
- devicePixelRatio = $.devicePixelRatio(),
- testImage = new Image();
+ /**
+ * Get reported or approximate device pixel ratio, bracketed to [1, 1.5, 2].
+ *
+ * This is useful for grabbing images on the fly with sizes based on the display
+ * density, without causing slowdown and extra thumbnail renderings on devices
+ * that are slightly different from the most common sizes.
+ *
+ * The bracketed ratios match the default 'srcset' output on MediaWiki thumbnails,
+ * so will be consistent with default renderings.
+ *
+ * - 1.0 means 1 CSS pixel is 1 hardware pixel
+ * - 1.5 means 1 CSS pixel is 1.5 hardware pixels
+ * - 2.0 means 1 CSS pixel is 2 hardware pixels
+ *
+ * @static
+ * @inheritable
+ * @return {number} Device pixel ratio
+ */
+ $.bracketedDevicePixelRatio = function () {
+ return $.bracketDevicePixelRatio( $.devicePixelRatio() );
+ };
+
+ /**
+ * Implement responsive images based on srcset attributes, if browser has no
+ * native srcset support.
+ *
+ * @return {jQuery} This selection
+ * @chainable
+ */
+ $.fn.hidpi = function () {
+ var $target = this,
+ // TODO add support for dpi media query checks on Firefox, IE
+ devicePixelRatio = $.devicePixelRatio(),
+ testImage = new Image();
- if ( devicePixelRatio > 1 && testImage.srcset === undefined ) {
- // No native srcset support.
- $target.find( 'img' ).each( function () {
- var $img = $( this ),
- srcset = $img.attr( 'srcset' ),
- match;
- if ( typeof srcset === 'string' && srcset !== '' ) {
- match = $.matchSrcSet( devicePixelRatio, srcset );
- if ( match !== null ) {
- $img.attr( 'src', match );
+ if ( devicePixelRatio > 1 && testImage.srcset === undefined ) {
+ // No native srcset support.
+ $target.find( 'img' ).each( function () {
+ var $img = $( this ),
+ srcset = $img.attr( 'srcset' ),
+ match;
+ if ( typeof srcset === 'string' && srcset !== '' ) {
+ match = $.matchSrcSet( devicePixelRatio, srcset );
+ if ( match !== null ) {
+ $img.attr( 'src', match );
+ }
}
- }
- } );
- }
+ } );
+ }
- return $target;
-};
+ return $target;
+ };
-/**
- * Match a srcset entry for the given device pixel ratio
- *
- * Exposed for testing.
- *
- * @private
- * @static
- * @param {number} devicePixelRatio
- * @param {string} srcset
- * @return {Mixed} null or the matching src string
- */
-$.matchSrcSet = function ( devicePixelRatio, srcset ) {
- var candidates,
- candidate,
- bits,
- src,
- i,
- ratioStr,
- ratio,
- selectedRatio = 1,
- selectedSrc = null;
- candidates = srcset.split( / *, */ );
- for ( i = 0; i < candidates.length; i++ ) {
- candidate = candidates[i];
- bits = candidate.split( / +/ );
- src = bits[0];
- if ( bits.length > 1 && bits[1].charAt( bits[1].length - 1 ) === 'x' ) {
- ratioStr = bits[1].slice( 0, -1 );
- ratio = parseFloat( ratioStr );
- if ( ratio <= devicePixelRatio && ratio > selectedRatio ) {
- selectedRatio = ratio;
- selectedSrc = src;
+ /**
+ * Match a srcset entry for the given device pixel ratio
+ *
+ * Exposed for testing.
+ *
+ * @private
+ * @static
+ * @param {number} devicePixelRatio
+ * @param {string} srcset
+ * @return {Mixed} null or the matching src string
+ */
+ $.matchSrcSet = function ( devicePixelRatio, srcset ) {
+ var candidates,
+ candidate,
+ bits,
+ src,
+ i,
+ ratioStr,
+ ratio,
+ selectedRatio = 1,
+ selectedSrc = null;
+ candidates = srcset.split( / *, */ );
+ for ( i = 0; i < candidates.length; i++ ) {
+ candidate = candidates[ i ];
+ bits = candidate.split( / +/ );
+ src = bits[ 0 ];
+ if ( bits.length > 1 && bits[ 1 ].charAt( bits[ 1 ].length - 1 ) === 'x' ) {
+ ratioStr = bits[ 1 ].slice( 0, -1 );
+ ratio = parseFloat( ratioStr );
+ if ( ratio <= devicePixelRatio && ratio > selectedRatio ) {
+ selectedRatio = ratio;
+ selectedSrc = src;
+ }
}
}
- }
- return selectedSrc;
-};
+ return selectedSrc;
+ };
-/**
- * @class jQuery
- * @mixins jQuery.plugin.hidpi
- */
+ /**
+ * @class jQuery
+ * @mixins jQuery.plugin.hidpi
+ */
}( jQuery ) );
dépôts / lhc / web / wiklou.git / blobdiff