static CMap initialize(PrismFontFile font) {
CMap cmap = null;
int offset, platformID, encodingID = -1;
int three0 = 0, three1 = 0, three10 = 0, zeroStarOffset = 0;
boolean zeroStar = false, threeStar = false;
Buffer cmapBuffer = font.readTable(FontConstants.cmapTag);
short numberSubTables = cmapBuffer.getShort(2);
/* Locate the offsets of supported 3,* Microsoft platform encodings,
* and any 0,* Unicode platform encoding. The latter is used by
* all current OS X fonts that don't have a Microsoft cmap.
* We will always prefer the Microsoft cmap, for the fonts that
* provide both. They ought to perform the same mappings. Although
* I can imagine that a vendor might provide a different looking
* glyph for some special characters for OS X vs Windows, I'm not
* actually aware of any such case.
*/
for (int i = 0; i < numberSubTables; i++) {
cmapBuffer.position(i * 8 + 4);
platformID = cmapBuffer.getShort();
if (platformID == 0) {
zeroStar = true;
encodingID = cmapBuffer.getShort();
zeroStarOffset = cmapBuffer.getInt();
} else if (platformID == 3) {
threeStar = true;
encodingID = cmapBuffer.getShort();
offset = cmapBuffer.getInt();
switch (encodingID) {
case 0:
three0 = offset;
break; // MS Symbol encoding
case 1:
three1 = offset;
break; // MS Unicode cmap
case 10:
three10 = offset;
break; // MS Unicode surrogates
}
}
}
/* This defines the preference order for cmap subtables */
if (threeStar) {
if (three10 != 0) {
cmap = createCMap(cmapBuffer, three10);
} else if (three0 != 0) {
cmap = createCMap(cmapBuffer, three0);
} else if (three1 != 0) {
cmap = createCMap(cmapBuffer, three1);
}
} else if (zeroStar && zeroStarOffset != 0) {
cmap = createCMap(cmapBuffer, zeroStarOffset);
} else {
/* No 0,* or supported 3,* subtable was found.
* Use whatever is the first table listed.
* Since these are supposed to be sorted, there's a good chance
* it will be Mac Roman (1,0). If its not that then its
* likely a really old font but not one that's found on either
* Windows or OS X
* In fact I didn't even find any OS X font that supported
* only (1,*).
* So this seems likely to be an untravelled path which is
* just as well given that its not likely to work properly.
*/
cmap = createCMap(cmapBuffer, cmapBuffer.getInt(8));
}
return cmap;
}
private void checkStyleMetrics() {
if (styleMetrics == null) {
styleMetrics = fontResource.getStyleMetrics(size);
}
}
