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/*
*
* (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "OpenTypeTables.h"
#include "ArabicShaping.h"
#include "LEGlyphStorage.h"
#include "ClassDefinitionTables.h"
U_NAMESPACE_BEGIN
// This table maps Unicode joining types to
// ShapeTypes.
const ArabicShaping::ShapeType ArabicShaping::shapeTypes[] =
{
ArabicShaping::ST_NOSHAPE_NONE, // [U]
ArabicShaping::ST_NOSHAPE_DUAL, // [C]
ArabicShaping::ST_DUAL, // [D]
ArabicShaping::ST_LEFT, // [L]
ArabicShaping::ST_RIGHT, // [R]
ArabicShaping::ST_TRANSPARENT // [T]
};
/*
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)
{
const ClassDefinitionTable *joiningTypes = (const ClassDefinitionTable *) ArabicShaping::shapingTypeTable;
le_int32 joiningType = joiningTypes->getGlyphClass(c);
if (joiningType >= 0 && joiningType < ArabicShaping::JT_COUNT) {
return ArabicShaping::shapeTypes[joiningType];
}
return ArabicShaping::ST_NOSHAPE_NONE;
}
#define isolFeatureTag LE_ISOL_FEATURE_TAG
#define initFeatureTag LE_INIT_FEATURE_TAG
#define mediFeatureTag LE_MEDI_FEATURE_TAG
#define finaFeatureTag LE_FINA_FEATURE_TAG
#define ligaFeatureTag LE_LIGA_FEATURE_TAG
#define msetFeatureTag LE_MSET_FEATURE_TAG
#define markFeatureTag LE_MARK_FEATURE_TAG
#define ccmpFeatureTag LE_CCMP_FEATURE_TAG
#define rligFeatureTag LE_RLIG_FEATURE_TAG
#define caltFeatureTag LE_CALT_FEATURE_TAG
#define dligFeatureTag LE_DLIG_FEATURE_TAG
#define cswhFeatureTag LE_CSWH_FEATURE_TAG
#define cursFeatureTag LE_CURS_FEATURE_TAG
#define kernFeatureTag LE_KERN_FEATURE_TAG
#define mkmkFeatureTag LE_MKMK_FEATURE_TAG
// NOTE:
// The isol, fina, init and medi features must be
// defined in the above order, and have masks that
// are all in the same nibble.
#define isolFeatureMask 0x80000000UL
#define finaFeatureMask 0x40000000UL
#define initFeatureMask 0x20000000UL
#define mediFeatureMask 0x10000000UL
#define ccmpFeatureMask 0x08000000UL
#define rligFeatureMask 0x04000000UL
#define caltFeatureMask 0x02000000UL
#define ligaFeatureMask 0x01000000UL
#define dligFeatureMask 0x00800000UL
#define cswhFeatureMask 0x00400000UL
#define msetFeatureMask 0x00200000UL
#define cursFeatureMask 0x00100000UL
#define kernFeatureMask 0x00080000UL
#define markFeatureMask 0x00040000UL
#define mkmkFeatureMask 0x00020000UL
#define NO_FEATURES 0
#define ISOL_FEATURES (isolFeatureMask | ligaFeatureMask | msetFeatureMask | markFeatureMask | ccmpFeatureMask | rligFeatureMask | caltFeatureMask | dligFeatureMask | cswhFeatureMask | cursFeatureMask | kernFeatureMask | mkmkFeatureMask)
#define SHAPE_MASK 0xF0000000UL
static const FeatureMap featureMap[] = {
{ccmpFeatureTag, ccmpFeatureMask},
{isolFeatureTag, isolFeatureMask},
{finaFeatureTag, finaFeatureMask},
{mediFeatureTag, mediFeatureMask},
{initFeatureTag, initFeatureMask},
{rligFeatureTag, rligFeatureMask},
{caltFeatureTag, caltFeatureMask},
{ligaFeatureTag, ligaFeatureMask},
{dligFeatureTag, dligFeatureMask},
{cswhFeatureTag, cswhFeatureMask},
{msetFeatureTag, msetFeatureMask},
{cursFeatureTag, cursFeatureMask},
{kernFeatureTag, kernFeatureMask},
{markFeatureTag, markFeatureMask},
{mkmkFeatureTag, mkmkFeatureMask}
};
const FeatureMap *ArabicShaping::getFeatureMap(le_int32 &count)
{
count = LE_ARRAY_SIZE(featureMap);
return featureMap;
}
void ArabicShaping::adjustTags(le_int32 outIndex, le_int32 shapeOffset, LEGlyphStorage &glyphStorage)
{
LEErrorCode success = LE_NO_ERROR;
FeatureMask featureMask = (FeatureMask) glyphStorage.getAuxData(outIndex, success);
FeatureMask shape = featureMask & SHAPE_MASK;
shape >>= shapeOffset;
glyphStorage.setAuxData(outIndex, ((featureMask & ~SHAPE_MASK) | shape), 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);
if (t == ST_NOSHAPE_NONE) {
glyphStorage.setAuxData(out, NO_FEATURES, success);
} else {
glyphStorage.setAuxData(out, ISOL_FEATURES, 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
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