2 *******************************************************************************
4 * Copyright (C) 1999-2007, International Business Machines
5 * Corporation and others. All Rights Reserved.
7 *******************************************************************************
8 * file name: LEFontInstance.cpp
10 * created on: 02/06/2003
11 * created by: Eric R. Mader
15 #include "LEScripts.h"
16 #include "LEFontInstance.h"
17 #include "LEGlyphStorage.h"
21 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LEFontInstance)
23 LECharMapper::~LECharMapper()
28 LEFontInstance::~LEFontInstance()
33 const LEFontInstance *LEFontInstance::getSubFont(const LEUnicode chars[], le_int32 *offset, le_int32 limit,
34 le_int32 script, LEErrorCode &success) const
36 if (LE_FAILURE(success)) {
40 if (chars == NULL || *offset < 0 || limit < 0 || *offset >= limit || script < 0 || script >= scriptCodeCount) {
41 success = LE_ILLEGAL_ARGUMENT_ERROR;
49 void LEFontInstance::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count,
50 le_bool reverse, const LECharMapper *mapper, le_bool filterZeroWidth, LEGlyphStorage &glyphStorage) const
52 le_int32 i, out = 0, dir = 1;
59 for (i = offset; i < offset + count; i += 1, out += dir) {
60 LEUnicode16 high = chars[i];
61 LEUnicode32 code = high;
63 if (i < offset + count - 1 && high >= 0xD800 && high <= 0xDBFF) {
64 LEUnicode16 low = chars[i + 1];
66 if (low >= 0xDC00 && low <= 0xDFFF) {
67 code = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
71 glyphStorage[out] = mapCharToGlyph(code, mapper, filterZeroWidth);
73 if (code >= 0x10000) {
75 glyphStorage[out += dir] = 0xFFFF;
80 LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
82 return mapCharToGlyph(ch, mapper, TRUE);
85 LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const
87 LEUnicode32 mappedChar = mapper->mapChar(ch);
89 if (mappedChar == 0xFFFE || mappedChar == 0xFFFF) {
93 if (filterZeroWidth && (mappedChar == 0x200C || mappedChar == 0x200D)) {
94 return canDisplay(mappedChar)? 0x0001 : 0xFFFF;
97 return mapCharToGlyph(mappedChar);
100 le_bool LEFontInstance::canDisplay(LEUnicode32 ch) const
102 return LE_GET_GLYPH(mapCharToGlyph(ch)) != 0;
105 float LEFontInstance::xUnitsToPoints(float xUnits) const
107 return (xUnits * getXPixelsPerEm()) / (float) getUnitsPerEM();
110 float LEFontInstance::yUnitsToPoints(float yUnits) const
112 return (yUnits * getYPixelsPerEm()) / (float) getUnitsPerEM();
115 void LEFontInstance::unitsToPoints(LEPoint &units, LEPoint &points) const
117 points.fX = xUnitsToPoints(units.fX);
118 points.fY = yUnitsToPoints(units.fY);
121 float LEFontInstance::xPixelsToUnits(float xPixels) const
123 return (xPixels * getUnitsPerEM()) / (float) getXPixelsPerEm();
126 float LEFontInstance::yPixelsToUnits(float yPixels) const
128 return (yPixels * getUnitsPerEM()) / (float) getYPixelsPerEm();
131 void LEFontInstance::pixelsToUnits(LEPoint &pixels, LEPoint &units) const
133 units.fX = xPixelsToUnits(pixels.fX);
134 units.fY = yPixelsToUnits(pixels.fY);
137 void LEFontInstance::transformFunits(float xFunits, float yFunits, LEPoint &pixels) const
139 pixels.fX = xUnitsToPoints(xFunits) * getScaleFactorX();
140 pixels.fY = yUnitsToPoints(yFunits) * getScaleFactorY();
143 le_int32 LEFontInstance::getLineHeight() const
145 return getAscent() + getDescent() + getLeading();