Convert abolute lengths to pixel values

plugins/cleanupListOfValues.js

@@ -7,12 +7,20 @@ exports.active = false;
 exports.params = {
     floatPrecision: 3,
     leadingZero: true,
-    defaultPx: true
+    defaultPx: true,
+    convertToPx: true
 };
 
 var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
     regSeparator = /\s+,?\s*|,\s*/,
-    removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero;
+    removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
+    absoluteLengths = { // relative to px
+        cm: 96/2.54,
+        mm: 9600/2.54,
+        in: 96,
+        pt: 4/3,
+        pc: 16
+    };
 
 /**
  * Round list of values to the fixed precision.
@@ -92,6 +100,15 @@ exports.fn = function(item, params) {
                 num = +(+match[1]).toFixed(params.floatPrecision),
                 units = match[3] || '';
 
+                // convert absolute values to pixels
+                if (params.convertToPx && units && (units in absoluteLengths)) {
+                    var pxNum = +(absoluteLengths[units] * match[1]).toFixed(params.floatPrecision);
+
+                    if (String(pxNum).length < match[0].length)
+                        num = pxNum,
+                        units = 'px';
+                }
+
                  // and remove leading zero
                 if (params.leadingZero) {
                     num = removeLeadingZero(num);

plugins/cleanupNumericValues.js

@@ -7,11 +7,19 @@ exports.active = true;
 exports.params = {
     floatPrecision: 3,
     leadingZero: true,
-    defaultPx: true
+    defaultPx: true,
+    convertToPx: true
 };
 
 var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|ft|em|ex|%)?$/,
-    removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero;
+    removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
+    absoluteLengths = { // relative to px
+        cm: 96/2.54,
+        mm: 9600/2.54,
+        in: 96,
+        pt: 4/3,
+        pc: 16
+    };
 
 /**
  * Round numeric values to the fixed precision,
@@ -34,10 +42,19 @@ exports.fn = function(item, params) {
 
             // if attribute value matches regNumericValues
             if (match) {
-                    // round it to the fixed precision
+                // round it to the fixed precision
                 var num = +(+match[1]).toFixed(params.floatPrecision),
                     units = match[3] || '';
 
+                // convert absolute values to pixels
+                if (params.convertToPx && units && (units in absoluteLengths)) {
+                    var pxNum = +(absoluteLengths[units] * match[1]).toFixed(params.floatPrecision);
+
+                    if (String(pxNum).length < match[0].length)
+                        num = pxNum,
+                        units = 'px';
+                }
+
                 // and remove leading zero
                 if (params.leadingZero) {
                     num = removeLeadingZero(num);

test/plugins/cleanupNumericValues.01.svg

@@ -1,9 +1,9 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="50.12356%" height="20px" x=".2655" y="-.2346">
-    test
+    <rect width="1in" heigth="12pt"/>
 </svg>
 
 @@@
 
 <svg xmlns="http://www.w3.org/2000/svg" width="50.124%" height="20" x=".266" y="-.235">
-    test
+    <rect width="96" heigth="16"/>
 </svg>