detectChineseTofu.patch
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	• bzimport
	Nov 22 2014, 3:04 AM

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detectChineseTofu.patch
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	diff --git a/resources/js/ext.uls.webfonts.js b/resources/js/ext.uls.webfonts.js
	index a1e3bd4..c63f158 100644
	--- a/resources/js/ext.uls.webfonts.js
	+++ b/resources/js/ext.uls.webfonts.js
	@@ -119,6 +119,47 @@
	return detected;
	}

	+ /**
	+ * Convert a Chinese Hanzi character to image data
	+ *
	+ * Draw the character on canvas, and return the bitmap in format: rgba rgba ...
	+ *
	+ * @param {string} character
	+ * @return {array}
	+ */
	+ function convertHanziToImageData( character ) {
	+ var canv = document.createElement("canvas");
	+ canv.width = 80; // 4+72+4, put the 72px char at center, and leave 4px as padding
	+ canv.height= 80;
	+
	+ var ctx=canv.getContext("2d");
	+ ctx.font="72px 宋体";
	+ ctx.fillText(character,4,68);
	+
	+ var imgData=ctx.getImageData( 0, 0, canv.width, canv.height ).data;
	+ return imgData;
	+ }
	+
	+ /**
	+ * Detect Chinese tofu
	+ *
	+ * Create tofu's and the character's images, compare them to see if the
	+ * character is rendered as a tofu
	+ *
	+ * @param {string} text
	+ * @return {boolean}
	+ */
	+ function detectChineseTofu( character ) {
	+ // TODO: TOFU_IMAGE_DATA can be created only once
	+ var TOFU_IMAGE_DATA = convertHanziToImageData("鿿"); // a known tofu: 鿿
	+
	+ var characterImageData = convertHanziToImageData( character );
	+ for (var i=0; i<TOFU_IMAGE_DATA.length; i++)
	+ if( characterImageData[i]!=TOFU_IMAGE_DATA[i] )
	+ return false;
	+ return true;
	+ }
	+
	mw.webfonts.setup = function () {
	// Initialize webfonts
	var mediawikiFontRepository = $.webfonts.repository;