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add hmtx writer

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This commit is contained in:
mkwiser 2014-10-01 22:56:46 +08:00
parent ed475288e8
commit 9a6681ced4
6 changed files with 152 additions and 27 deletions
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2
demo/js/baiduHealth.json
View File

@ -6816,7 +6816,7 @@
}
],
"unicode": [57399],
"advanceWidth": 519,
"advanceWidth": 569,
"leftSideBearing": 10,
"name": "uniE037\u0007"
},

14
src/ttf/table/glyfwriter.js
View File

@ -408,8 +408,13 @@ define(
// 设置其他表的信息
var xMin = 16384, yMin = 16384, xMax = -16384, yMax = -16384;
var advanceWidthMax = -1, minLeftSideBearing = 16384, minRightSideBearing = 16384, xMaxExtent = -16384;
ttf.glyf.forEach(function(glyf) {
advanceWidthMax = Math.max(advanceWidthMax, glyf.advanceWidth);
minLeftSideBearing = Math.min(minLeftSideBearing, glyf.leftSideBearing);
minRightSideBearing = Math.min(minRightSideBearing, glyf.advanceWidth - glyf.xMax);
xMaxExtent = Math.max(xMaxExtent, glyf.xMax);
if (glyf.xMin < xMin) {
xMin = glyf.xMin;
}
@ -424,6 +429,13 @@ define(
}
});
// rewrite hhea
ttf.hhea.advanceWidthMax = advanceWidthMax;
ttf.hhea.minLeftSideBearing = minLeftSideBearing;
ttf.hhea.minRightSideBearing = minRightSideBearing;
ttf.hhea.xMaxExtent = xMaxExtent;
// rewrite head
ttf.head.xMin = xMin;
ttf.head.yMin = yMin;
ttf.head.xMax = xMax;

32
src/ttf/table/hmtx.js
View File

@ -52,7 +52,39 @@ define(
},
write: function(writer, ttf) {
var numOfLongHorMetrics = ttf.hhea.numOfLongHorMetrics;
for (var i = 0; i < numOfLongHorMetrics; ++i) {
writer.writeUint16(ttf.glyf[i].advanceWidth);
writer.writeInt16(ttf.glyf[i].leftSideBearing);
}
// 最后一个宽度
var advanceWidth = ttf.glyf[numOfLongHorMetrics - 1].advanceWidth;
var numOfLast = ttf.glyf.length - numOfLongHorMetrics;
for (var i = 0; i < numOfLast; ++i) {
writer.writeInt16(ttf.glyf[numOfLongHorMetrics + i].leftSideBearing);
}
return writer;
},
size: function(ttf) {
// 计算同最后一个advanceWidth相等的元素个数
var numOfLast = 0;
var advanceWidth = ttf.glyf[ttf.glyf.length - 1].advanceWidth; // 最后一个advanceWidth
for(var i = ttf.glyf.length - 2; i >= 0; i--) {
if (advanceWidth == ttf.glyf[i].advanceWidth) {
numOfLast++;
}
else {
break;
}
}
ttf.hhea.numOfLongHorMetrics = ttf.glyf.length - numOfLast;
return 4 * ttf.hhea.numOfLongHorMetrics + 2 * numOfLast;
}
}
);

25
src/ttf/table/post.js
View File

@ -13,6 +13,8 @@ define(
function(require) {
var table = require('./table');
var struct = require('./struct');
var string = require('../util/string');
var Posthead = table.create(
'posthead',
[
@ -29,27 +31,6 @@ define(
]
);
/**
* 读取poststring
*
* @param {Array.<byte>} byteArray byte数组
* @return {Array.<string>} 读取后的字符串数组
*/
function readPascalString(byteArray) {
var strArray = [];
var i = 0;
var l = byteArray.length;
while(i < l) {
var strLength = byteArray[i];
var str = '';
while(strLength-- >= 0 && i < l) {
str += String.fromCharCode(byteArray[++i]);
}
strArray.push(str);
}
return strArray;
}
var post = table.create(
'post',
[
@ -73,7 +54,7 @@ define(
var pascalStringOffset = reader.offset;
var pascalStringLength = ttf.tables.post.length - (pascalStringOffset - this.offset);
var pascalStringBytes = reader.readBytes(reader.offset, pascalStringLength);
tbl.names = readPascalString(pascalStringBytes);
tbl.names = string.readPascalString(pascalStringBytes);
}
return tbl;

21
src/ttf/ttfwriter.js
View File

@ -77,6 +77,11 @@ define(
var cmapWriter = new Writer(new ArrayBuffer(cmapTbl.size(ttf)));
cmapTbl.write(cmapWriter, ttf);
// 写入hmtx
var hmtxTbl = new supportTables['hmtx']();
var hmtxWriter = new Writer(new ArrayBuffer(hmtxTbl.size(ttf)));
hmtxTbl.write(hmtxWriter, ttf);
// 读取测试
@ -87,19 +92,29 @@ define(
var locaReader = new Reader(locaWriter.getBuffer());
locaTbl.offset = 0;
ttf.loca = locaTbl.read(locaReader, ttf);
console.log('loca readed');
console.log(ttf.loca);
var glyfReader = new Reader(glyfWriter.getBuffer());
glyfTbl.offset = 0;
ttf.glyfReaded = glyfTbl.read(glyfReader, ttf);
var glyf = glyfTbl.read(glyfReader, ttf);
console.log('glyf readed');
console.log(glyf);
var cmapReader = new Reader(cmapWriter.getBuffer());
cmapTbl.offset = 0;
ttf.cmap = cmapTbl.read(cmapReader, ttf);
var readWindowsAllCodes = require('./util/readWindowsAllCodes');
console.log('cmap readed');
console.log(readWindowsAllCodes(ttf));
var hmtxReader = new Reader(hmtxWriter.getBuffer());
hmtxTbl.offset = 0;
var hmtx = hmtxTbl.read(hmtxReader, ttf);
console.log('hmtx readed');
console.log(hmtx);
throw 'test';
// var ttfSize = 20 + tableList.length * 16;

85
src/ttf/util/string.js Normal file
View File

@ -0,0 +1,85 @@
/**
* @file string.js
* @author mengke01
* @date
* @description
* string工具箱
*
* see svg2ttf @ github
*/
define(
function(require) {
var string = {
/**
* 转换成utf8的字节数组
*
* @param {string} str 字符串
* @return {Array.<byte>} 字节数组
*/
toUTF8Bytes: function(str) {
var byteArray = [];
for (var i = 0; i < str.length; i++) {
if (str.charCodeAt(i) <= 0x7F) {
byteArray.push(str.charCodeAt(i));
}
else {
var h = encodeURIComponent(str.charAt(i)).substr(1).split('%');
for (var j = 0; j < h.length; j++) {
byteArray.push(parseInt(h[j], 16));
}
}
}
return byteArray;
},
/**
* 转换成usc2的字节数组
*
* @param {string} str 字符串
* @return {Array.<byte>} 字节数组
*/
toUCS2Bytes: function(str) {
// Code is taken here:
// http://stackoverflow.com/questions/6226189/how-to-convert-a-string-to-bytearray
var byteArray = [];
var ch;
for (var i = 0; i < str.length; ++i) {
ch = str.charCodeAt(i);
byteArray.push(ch >> 8);
byteArray.push(ch & 0xFF);
}
return byteArray;
},
/**
* 读取poststring
*
* @param {Array.<byte>} byteArray byte数组
* @return {Array.<string>} 读取后的字符串数组
*/
readPascalString: function (byteArray) {
var strArray = [];
var i = 0;
var l = byteArray.length;
while(i < l) {
var strLength = byteArray[i];
var str = '';
while(strLength-- >= 0 && i < l) {
str += String.fromCharCode(byteArray[++i]);
}
strArray.push(str);
}
return strArray;
}
};
return string;
}
);