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Point Arabic lam alef pairs to lam-alef ligatures. Bug 308020, r+sr=roc

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This commit is contained in:
smontagu%smontagu.org 2006-02-12 09:43:18 +00:00
parent c969315f1d
commit 7d305f0f17
2 changed files with 47 additions and 0 deletions
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13
layout/generic/nsTextFrame.cpp
View File

@ -2241,6 +2241,19 @@ nsTextFrame::PrepareUnicodeText(nsTextTransformer& aTX,
*indexp++ = strInx;
continue;
}
// Point lam and alef to lamalef in shaped text
if (aTX.NeedsArabicShaping()) {
if (IS_LAM(ch) && IS_LAMALEF(*tp)) {
// No need to check for index > length, since
// GetContentCharAt() checks
PRUnichar ch1 = aTX.GetContentCharAt(mContentOffset +
indexp + 1 - aIndexBuffer->mBuffer);
if (IS_ALEF(ch1)) {
*indexp++ = strInx;
--i;
}
}
}
*indexp++ = strInx++;
// Point any capitalized German ß to 'SS'
if (caseChanged && ch == kSZLIG && *tp == PRUnichar('S')) {

34
layout/generic/nsTextTransformer.h
View File

@ -86,6 +86,40 @@ class nsIWordBreaker;
(((_ch) == CH_SHY) || ((_ch) == '\r'))
#endif
/* Unicode codepoints that could be the first of a lam alef pair converted to
* a lam alef ligature by ArabicShaping()
*/
#define IS_LAM(_ch) \
(((_ch) == 0x0644) || /* ARABIC LETTER LAM */ \
((_ch) == 0xfedf) || /* ARABIC LETTER LAM INITIAL FORM */ \
((_ch) == 0xfee0)) /* ARABIC LETTER LAM MEDIAL FORM */ \
/* Unicode codepoints that could be the second of a lam alef pair converted to
* a lam alef ligature by ArabicShaping()
*/
#define IS_ALEF(_ch) \
(((_ch) == 0x0622) || /* ARABIC LETTER ALEF WITH MADDA ABOVE */ \
((_ch) == 0x0623) || /* ARABIC LETTER ALEF WITH HAMZA ABOVE */ \
((_ch) == 0x0625) || /* ARABIC LETTER ALEF WITH HAMZA BELOW */ \
((_ch) == 0x0627) || /* ARABIC LETTER ALEF */ \
((_ch) == 0xfe82) || /* ARABIC LETTER ALEF WITH MADDA ABOVE FINAL FORM */ \
((_ch) == 0xfe84) || /* ARABIC LETTER ALEF WITH HAMZA ABOVE FINAL FORM */ \
((_ch) == 0xfe88) || /* ARABIC LETTER ALEF WITH HAMZA BELOW FINAL FORM */ \
((_ch) == 0xfe8e)) /* ARABIC LETTER ALEF FINAL FORM */
/* Unicode codepoints that could have been converted from a lam alef pair to a
* lam alef ligature by Arabic Shaping()
*/
#define IS_LAMALEF(_ch) (((_ch) >= 0xfef5) && ((_ch) <= 0xfefc))
/* FEF5 ARABIC LIGATURE LAM WITH ALEF WITH MADDA ABOVE ISOLATED FORM */
/* FEF6 ARABIC LIGATURE LAM WITH ALEF WITH MADDA ABOVE FINAL FORM */
/* FEF7 ARABIC LIGATURE LAM WITH ALEF WITH HAMZA ABOVE ISOLATED FORM */
/* FEF8 ARABIC LIGATURE LAM WITH ALEF WITH HAMZA ABOVE FINAL FORM */
/* FEF9 ARABIC LIGATURE LAM WITH ALEF WITH HAMZA BELOW ISOLATED FORM */
/* FEFA ARABIC LIGATURE LAM WITH ALEF WITH HAMZA BELOW FINAL FORM */
/* FEFB ARABIC LIGATURE LAM WITH ALEF ISOLATED FORM */
/* FEFC;ARABIC LIGATURE LAM WITH ALEF FINAL FORM */
#define IS_ASCII_CHAR(ch) ((ch&0xff80) == 0)
#define NS_TEXT_TRANSFORMER_AUTO_WORD_BUF_SIZE 128 // used to be 256