--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/layout/ArabicShaping.cpp Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,206 @@
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ *
+ */
+
+#include "LETypes.h"
+#include "OpenTypeTables.h"
+#include "ArabicShaping.h"
+#include "LEGlyphStorage.h"
+
+U_NAMESPACE_BEGIN
+
+enum {
+ _c_ = ArabicShaping::ST_NOSHAPE_DUAL,
+ _d_ = ArabicShaping::ST_DUAL,
+ _n_ = ArabicShaping::ST_NONE,
+ _r_ = ArabicShaping::ST_RIGHT,
+ _t_ = ArabicShaping::ST_TRANSPARENT,
+ _x_ = ArabicShaping::ST_NOSHAPE_NONE
+};
+
+const ArabicShaping::ShapeType ArabicShaping::shapeTypes[] =
+{
+ _t_, _t_, _t_, _t_, _t_, _t_, _x_, _x_, _x_, _x_, _x_, _n_, _x_, _x_, _x_, _n_, // 0x610 - 0x61f
+ _x_, _n_, _r_, _r_, _r_, _r_, _d_, _r_, _d_, _r_, _d_, _d_, _d_, _d_, _d_, _r_, // 0x620 - 0x62f
+ _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _x_, _x_, _x_, _x_, _x_, // 0x630 - 0x63f
+ _c_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _r_, _d_, _d_, _t_, _t_, _t_, _t_, _t_, // 0x640 - 0x64f
+ _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _x_, _x_, _x_, _x_, _x_, _x_, _x_, // 0x650 - 0x65f
+ _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _d_, _d_, // 0x660 - 0x66f
+ _t_, _r_, _r_, _r_, _n_, _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x670 - 0x67f
+ _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, // 0x680 - 0x68f
+ _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x690 - 0x69f
+ _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x6a0 - 0x6af
+ _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, _d_, // 0x6b0 - 0x6bf
+ _r_, _d_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _r_, _d_, _r_, _d_, _r_, // 0x6c0 - 0x6cf
+ _d_, _d_, _r_, _r_, _n_, _r_, _t_, _t_, _t_, _t_, _t_, _t_, _t_, _x_, _t_, _t_, // 0x6d0 - 0x6df
+ _t_, _t_, _t_, _t_, _t_, _n_, _n_, _t_, _t_, _n_, _t_, _t_, _t_, _t_, _r_, _r_, // 0x6e0 - 0x6ef
+ _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _n_, _d_, _d_, _d_, _n_, _n_, _d_ // 0x6f0 - 0x6ff
+};
+
+/*
+ shaping array holds types for Arabic chars between 0610 and 0700
+ other values are either unshaped, or transparent if a mark or format
+ code, except for format codes 200c (zero-width non-joiner) and 200d
+ (dual-width joiner) which are both unshaped and non_joining or
+ dual-joining, respectively.
+*/
+ArabicShaping::ShapeType ArabicShaping::getShapeType(LEUnicode c)
+{
+ if (c >= 0x0610 && c <= 0x206f) {
+ if (c < 0x0700) {
+ return shapeTypes[c - 0x0610];
+ } else if (c == 0x200c) { // ZWNJ
+ return ST_NOSHAPE_NONE;
+ } else if (c == 0x200d) { // ZWJ
+ return ST_NOSHAPE_DUAL;
+ } else if (c >= 0x202a && c <= 0x202e) { // LRE - RLO
+ return ST_TRANSPARENT;
+ } else if (c >= 0x206a && c <= 0x206f) { // Inhibit Symmetric Swapping - Nominal Digit Shapes
+ return ST_TRANSPARENT;
+ }
+ }
+
+ return ST_NOSHAPE_NONE;
+}
+
+static const LETag isolFeatureTag = LE_ISOL_FEATURE_TAG;
+static const LETag initFeatureTag = LE_INIT_FEATURE_TAG;
+static const LETag mediFeatureTag = LE_MEDI_FEATURE_TAG;
+static const LETag finaFeatureTag = LE_FINA_FEATURE_TAG;
+static const LETag ligaFeatureTag = LE_LIGA_FEATURE_TAG;
+static const LETag msetFeatureTag = LE_MSET_FEATURE_TAG;
+static const LETag markFeatureTag = LE_MARK_FEATURE_TAG;
+static const LETag ccmpFeatureTag = LE_CCMP_FEATURE_TAG;
+static const LETag rligFeatureTag = LE_RLIG_FEATURE_TAG;
+static const LETag caltFeatureTag = LE_CALT_FEATURE_TAG;
+static const LETag dligFeatureTag = LE_DLIG_FEATURE_TAG;
+static const LETag cswhFeatureTag = LE_CSWH_FEATURE_TAG;
+static const LETag cursFeatureTag = LE_CURS_FEATURE_TAG;
+static const LETag kernFeatureTag = LE_KERN_FEATURE_TAG;
+static const LETag mkmkFeatureTag = LE_MKMK_FEATURE_TAG;
+
+static const LETag emptyTag = 0x00000000; // ''
+
+static const LETag featureOrder[] =
+{
+ ccmpFeatureTag, isolFeatureTag, finaFeatureTag, mediFeatureTag, initFeatureTag, rligFeatureTag,
+ caltFeatureTag, ligaFeatureTag, dligFeatureTag, cswhFeatureTag, msetFeatureTag, cursFeatureTag,
+ kernFeatureTag, markFeatureTag, mkmkFeatureTag, emptyTag
+};
+
+const LETag ArabicShaping::tagArray[] =
+{
+ isolFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag,
+ caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag,
+
+ finaFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag,
+ caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag,
+
+ initFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag,
+ caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag,
+
+ mediFeatureTag, ligaFeatureTag, msetFeatureTag, markFeatureTag, ccmpFeatureTag, rligFeatureTag,
+ caltFeatureTag, dligFeatureTag, cswhFeatureTag, cursFeatureTag, kernFeatureTag, mkmkFeatureTag, emptyTag
+};
+
+#define TAGS_PER_GLYPH ((sizeof ArabicShaping::tagArray / sizeof ArabicShaping::tagArray[0]) / 4)
+
+const LETag *ArabicShaping::getFeatureOrder()
+{
+ return featureOrder;
+}
+
+void ArabicShaping::adjustTags(le_int32 outIndex, le_int32 shapeOffset, LEGlyphStorage &glyphStorage)
+{
+ LEErrorCode success = LE_NO_ERROR;
+ const LETag *glyphTags = (const LETag *) glyphStorage.getAuxData(outIndex, success);
+
+ glyphStorage.setAuxData(outIndex, (void *) &glyphTags[TAGS_PER_GLYPH * shapeOffset], success);
+}
+
+void ArabicShaping::shape(const LEUnicode *chars, le_int32 offset, le_int32 charCount, le_int32 charMax,
+ le_bool rightToLeft, LEGlyphStorage &glyphStorage)
+{
+ // iterate in logical order, store tags in visible order
+ //
+ // the effective right char is the most recently encountered
+ // non-transparent char
+ //
+ // four boolean states:
+ // the effective right char shapes
+ // the effective right char causes left shaping
+ // the current char shapes
+ // the current char causes right shaping
+ //
+ // if both cause shaping, then
+ // shaper.shape(errout, 2) (isolate to initial, or final to medial)
+ // shaper.shape(out, 1) (isolate to final)
+
+ ShapeType rightType = ST_NOSHAPE_NONE, leftType = ST_NOSHAPE_NONE;
+ LEErrorCode success = LE_NO_ERROR;
+ le_int32 i;
+
+ for (i = offset - 1; i >= 0; i -= 1) {
+ rightType = getShapeType(chars[i]);
+
+ if (rightType != ST_TRANSPARENT) {
+ break;
+ }
+ }
+
+ for (i = offset + charCount; i < charMax; i += 1) {
+ leftType = getShapeType(chars[i]);
+
+ if (leftType != ST_TRANSPARENT) {
+ break;
+ }
+ }
+
+ // erout is effective right logical index
+ le_int32 erout = -1;
+ le_bool rightShapes = FALSE;
+ le_bool rightCauses = (rightType & MASK_SHAPE_LEFT) != 0;
+ le_int32 in, e, out = 0, dir = 1;
+
+ if (rightToLeft) {
+ out = charCount - 1;
+ erout = charCount;
+ dir = -1;
+ }
+
+ for (in = offset, e = offset + charCount; in < e; in += 1, out += dir) {
+ LEUnicode c = chars[in];
+ ShapeType t = getShapeType(c);
+
+ glyphStorage.setAuxData(out, (void *) tagArray, success);
+
+ if ((t & MASK_TRANSPARENT) != 0) {
+ continue;
+ }
+
+ le_bool curShapes = (t & MASK_NOSHAPE) == 0;
+ le_bool curCauses = (t & MASK_SHAPE_RIGHT) != 0;
+
+ if (rightCauses && curCauses) {
+ if (rightShapes) {
+ adjustTags(erout, 2, glyphStorage);
+ }
+
+ if (curShapes) {
+ adjustTags(out, 1, glyphStorage);
+ }
+ }
+
+ rightShapes = curShapes;
+ rightCauses = (t & MASK_SHAPE_LEFT) != 0;
+ erout = out;
+ }
+
+ if (rightShapes && rightCauses && (leftType & MASK_SHAPE_RIGHT) != 0) {
+ adjustTags(erout, 2, glyphStorage);
+ }
+}
+
+U_NAMESPACE_END