diff options
Diffstat (limited to 'lib/gdi/font_arabic.cpp')
| -rw-r--r-- | lib/gdi/font_arabic.cpp | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/lib/gdi/font_arabic.cpp b/lib/gdi/font_arabic.cpp new file mode 100644 index 00000000..573f9fa2 --- /dev/null +++ b/lib/gdi/font_arabic.cpp @@ -0,0 +1,266 @@ +/* + * This was taken from pango. + * Modified for enigma by Felix Domke <tmbinc@gmx.net>. + * I removed support for vowels and ligatures. Sorry. + * + * Original header: + * + * This is part of Pango - Arabic shaping module + * + * (C) 2000 Karl Koehler <koehler@or.uni-bonn.de> + * (C) 2001 Roozbeh Pournader <roozbeh@sharif.edu> + * + */ + +#include <vector> +#include <lib/base/eerror.h> + +typedef struct +{ + unsigned long basechar; + int count; + unsigned long charshape[4]; +} shapestruct; + +typedef struct +{ + unsigned long basechar; + char numshapes; +} charstruct; + +static void +charstruct_init (charstruct * s) +{ + s->basechar = 0; + s->numshapes = 1; +} + +#define connects_to_left(a) ((a).numshapes > 2) + +/* The Unicode order is always 'isolated, final, initial, medial'. */ + +/* *INDENT-OFF* */ +static shapestruct chartable[] = { + {0x0621, 1, {0xFE80}}, /* HAMZA */ + {0x0622, 2, {0xFE81, 0xFE82}}, /* ALEF WITH MADDA ABOVE */ + {0x0623, 2, {0xFE83, 0xFE84}}, /* ALEF WITH HAMZA ABOVE */ + {0x0624, 2, {0xFE85, 0xFE86}}, /* WAW WITH HAMZA ABOVE */ + {0x0625, 2, {0xFE87, 0xFE88}}, /* ALEF WITH HAMZA BELOW */ + {0x0626, 4, {0xFE89, 0xFE8A, 0xFE8B, 0xFE8C}}, /* YEH WITH HAMZA ABOVE */ + {0x0627, 2, {0xFE8D, 0xFE8E}}, /* ALEF */ + {0x0628, 4, {0xFE8F, 0xFE90, 0xFE91, 0xFE92}}, /* BEH */ + {0x0629, 2, {0xFE93, 0xFE94}}, /* TEH MARBUTA */ + {0x062A, 4, {0xFE95, 0xFE96, 0xFE97, 0xFE98}}, /* TEH */ + {0x062B, 4, {0xFE99, 0xFE9A, 0xFE9B, 0xFE9C}}, /* THEH */ + {0x062C, 4, {0xFE9D, 0xFE9E, 0xFE9F, 0xFEA0}}, /* JEEM */ + {0x062D, 4, {0xFEA1, 0xFEA2, 0xFEA3, 0xFEA4}}, /* HAH */ + {0x062E, 4, {0xFEA5, 0xFEA6, 0xFEA7, 0xFEA8}}, /* KHAH */ + {0x062F, 2, {0xFEA9, 0xFEAA}}, /* DAL */ + {0x0630, 2, {0xFEAB, 0xFEAC}}, /* THAL */ + {0x0631, 2, {0xFEAD, 0xFEAE}}, /* REH */ + {0x0632, 2, {0xFEAF, 0xFEB0}}, /* ZAIN */ + {0x0633, 4, {0xFEB1, 0xFEB2, 0xFEB3, 0xFEB4}}, /* SEEN */ + {0x0634, 4, {0xFEB5, 0xFEB6, 0xFEB7, 0xFEB8}}, /* SHEEN */ + {0x0635, 4, {0xFEB9, 0xFEBA, 0xFEBB, 0xFEBC}}, /* SAD */ + {0x0636, 4, {0xFEBD, 0xFEBE, 0xFEBF, 0xFEC0}}, /* DAD */ + {0x0637, 4, {0xFEC1, 0xFEC2, 0xFEC3, 0xFEC4}}, /* TAH */ + {0x0638, 4, {0xFEC5, 0xFEC6, 0xFEC7, 0xFEC8}}, /* ZAH */ + {0x0639, 4, {0xFEC9, 0xFECA, 0xFECB, 0xFECC}}, /* AIN */ + {0x063A, 4, {0xFECD, 0xFECE, 0xFECF, 0xFED0}}, /* GHAIN */ + {0x0640, 4, {0x0640, 0x0640, 0x0640, 0x0640}}, /* TATWEEL */ + {0x0641, 4, {0xFED1, 0xFED2, 0xFED3, 0xFED4}}, /* FEH */ + {0x0642, 4, {0xFED5, 0xFED6, 0xFED7, 0xFED8}}, /* QAF */ + {0x0643, 4, {0xFED9, 0xFEDA, 0xFEDB, 0xFEDC}}, /* KAF */ + {0x0644, 4, {0xFEDD, 0xFEDE, 0xFEDF, 0xFEE0}}, /* LAM */ + {0x0645, 4, {0xFEE1, 0xFEE2, 0xFEE3, 0xFEE4}}, /* MEEM */ + {0x0646, 4, {0xFEE5, 0xFEE6, 0xFEE7, 0xFEE8}}, /* NOON */ + {0x0647, 4, {0xFEE9, 0xFEEA, 0xFEEB, 0xFEEC}}, /* HEH */ + {0x0648, 2, {0xFEED, 0xFEEE}}, /* WAW */ + {0x0649, 4, {0xFEEF, 0xFEF0, 0xFBE8, 0xFBE9}}, /* ALEF MAKSURA */ + {0x064A, 4, {0xFEF1, 0xFEF2, 0xFEF3, 0xFEF4}}, /* YEH */ + {0x0671, 2, {0xFB50, 0xFB51}}, /* ALEF WASLA */ + {0x0679, 4, {0xFB66, 0xFB67, 0xFB68, 0xFB69}}, /* TTEH */ + {0x067A, 4, {0xFB5E, 0xFB5F, 0xFB60, 0xFB61}}, /* TTEHEH */ + {0x067B, 4, {0xFB52, 0xFB53, 0xFB54, 0xFB55}}, /* BEEH */ + {0x067E, 4, {0xFB56, 0xFB57, 0xFB58, 0xFB59}}, /* PEH */ + {0x067F, 4, {0xFB62, 0xFB63, 0xFB64, 0xFB65}}, /* TEHEH */ + {0x0680, 4, {0xFB5A, 0xFB5B, 0xFB5C, 0xFB5D}}, /* BEHEH */ + {0x0683, 4, {0xFB76, 0xFB77, 0xFB78, 0xFB79}}, /* NYEH */ + {0x0684, 4, {0xFB72, 0xFB73, 0xFB74, 0xFB75}}, /* DYEH */ + {0x0686, 4, {0xFB7A, 0xFB7B, 0xFB7C, 0xFB7D}}, /* TCHEH */ + {0x0687, 4, {0xFB7E, 0xFB7F, 0xFB80, 0xFB81}}, /* TCHEHEH */ + {0x0688, 2, {0xFB88, 0xFB89}}, /* DDAL */ + {0x068C, 2, {0xFB84, 0xFB85}}, /* DAHAL */ + {0x068D, 2, {0xFB82, 0xFB83}}, /* DDAHAL */ + {0x068E, 2, {0xFB86, 0xFB87}}, /* DUL */ + {0x0691, 2, {0xFB8C, 0xFB8D}}, /* RREH */ + {0x0698, 2, {0xFB8A, 0xFB8B}}, /* JEH */ + {0x06A4, 4, {0xFB6A, 0xFB6B, 0xFB6C, 0xFB6D}}, /* VEH */ + {0x06A6, 4, {0xFB6E, 0xFB6F, 0xFB70, 0xFB71}}, /* PEHEH */ + {0x06A9, 4, {0xFB8E, 0xFB8F, 0xFB90, 0xFB91}}, /* KEHEH */ + {0x06AD, 4, {0xFBD3, 0xFBD4, 0xFBD5, 0xFBD6}}, /* NG */ + {0x06AF, 4, {0xFB92, 0xFB93, 0xFB94, 0xFB95}}, /* GAF */ + {0x06B1, 4, {0xFB9A, 0xFB9B, 0xFB9C, 0xFB9D}}, /* NGOEH */ + {0x06B3, 4, {0xFB96, 0xFB97, 0xFB98, 0xFB99}}, /* GUEH */ + {0x06BB, 4, {0xFBA0, 0xFBA1, 0xFBA2, 0xFBA3}}, /* RNOON */ + {0x06BE, 4, {0xFBAA, 0xFBAB, 0xFBAC, 0xFBAD}}, /* HEH DOACHASHMEE */ + {0x06C0, 2, {0xFBA4, 0xFBA5}}, /* HEH WITH YEH ABOVE */ + {0x06C1, 4, {0xFBA6, 0xFBA7, 0xFBA8, 0xFBA9}}, /* HEH GOAL */ + {0x06C5, 2, {0xFBE0, 0xFBE1}}, /* KIRGHIZ OE */ + {0x06C6, 2, {0xFBD9, 0xFBDA}}, /* OE */ + {0x06C7, 2, {0xFBD7, 0xFBD8}}, /* U */ + {0x06C8, 2, {0xFBDB, 0xFBDC}}, /* YU */ + {0x06C9, 2, {0xFBE2, 0xFBE3}}, /* KIRGHIZ YU */ + {0x06CB, 2, {0xFBDE, 0xFBDF}}, /* VE */ + {0x06CC, 4, {0xFBFC, 0xFBFD, 0xFBFE, 0xFBFF}}, /* FARSI YEH */ + {0x06D0, 4, {0xFBE4, 0xFBE5, 0xFBE6, 0xFBE7}}, /* E */ + {0x06D2, 2, {0xFBAE, 0xFBAF}}, /* YEH BARREE */ + {0x06D3, 2, {0xFBB0, 0xFBB1}}, /* YEH BARREE WITH HAMZA ABOVE */ +}; + +#define ALEF 0x0627 +#define ALEFHAMZA 0x0623 +#define ALEFHAMZABELOW 0x0625 +#define ALEFMADDA 0x0622 +#define LAM 0x0644 +#define HAMZA 0x0621 +#define TATWEEL 0x0640 +#define ZWJ 0x200D + +#define HAMZAABOVE 0x0654 +#define HAMZABELOW 0x0655 + +#define WAWHAMZA 0x0624 +#define YEHHAMZA 0x0626 +#define WAW 0x0648 +#define ALEFMAKSURA 0x0649 +#define YEH 0x064A +#define FARSIYEH 0x06CC + +#define SHADDA 0x0651 +#define KASRA 0x0650 +#define FATHA 0x064E +#define DAMMA 0x064F +#define MADDA 0x0653 + +#define LAM_ALEF 0xFEFB +#define LAM_ALEFHAMZA 0xFEF7 +#define LAM_ALEFHAMZABELOW 0xFEF9 +#define LAM_ALEFMADDA 0xFEF5 + +static short +shapecount (unsigned long s) +{ + int l, r, m; + if ((s >= 0x0621) && (s <= 0x06D3)) + { + l = 0; + r = sizeof (chartable) / sizeof (shapestruct); + while (l <= r) + { + m = (l + r) / 2; + if (s == chartable[m].basechar) + { + return chartable[m].count; + } + else if (s < chartable[m].basechar) + { + r = m - 1; + } + else + { + l = m + 1; + } + } + } + else if (s == ZWJ) + { + return 4; + } + return 1; +} + +static unsigned long +charshape (unsigned long s, int which) +/* which 0=isolated 1=final 2=initial 3=medial */ +{ + int l, r, m; + if ((s >= 0x0621) && (s <= 0x06D3)) + { + l = 0; + r = sizeof (chartable) / sizeof (shapestruct); + while (l <= r) + { + m = (l + r) / 2; + if (s == chartable[m].basechar) + { + return chartable[m].charshape[which]; + } + else if (s < chartable[m].basechar) + { + r = m - 1; + } + else + { + l = m + 1; + } + } + } + else if ((s >= 0xFEF5) && (s <= 0xFEFB)) + { /* Lam+Alef */ + return s + which; + } + + return s; +} + +void +shape (std::vector<unsigned long> &string, const std::vector<unsigned long> &text) +{ + string.reserve(text.size()); + + charstruct oldchar, curchar; + int which; + unsigned long nextletter; + + charstruct_init (&oldchar); + charstruct_init (&curchar); + + for (std::vector<unsigned long>::const_iterator i(text.begin()); + i != text.end(); ++i) + { + nextletter = *i; + int nc = shapecount (nextletter); + + if (nc == 1) + which = 0; /* final or isolated */ + else + which = 2; /* medial or initial */ + if (connects_to_left (oldchar)) + which++; + which = which % (curchar.numshapes); + curchar.basechar = charshape (curchar.basechar, which); + /* get rid of oldchar */ + if (oldchar.basechar) + string.push_back(oldchar.basechar); + oldchar = curchar; /* new values in oldchar */ + + /* init new curchar */ + charstruct_init (&curchar); + curchar.basechar = nextletter; + curchar.numshapes = nc; + } + + /* Handle last char */ + if (connects_to_left (oldchar)) + which = 1; + else + which = 0; + which = which % (curchar.numshapes); + curchar.basechar = charshape (curchar.basechar, which); + + if (oldchar.basechar != 0) + string.push_back(oldchar.basechar); + if (curchar.basechar != 0) + string.push_back(curchar.basechar); +} |