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1 /*
2  *******************************************************************************
3  *
4  *   Copyright (C) 1999-2007, International Business Machines
5  *   Corporation and others.  All Rights Reserved.
6  *
7  *******************************************************************************
8  *   file name:  LEFontInstance.cpp
9  *
10  *   created on: 02/06/2003
11  *   created by: Eric R. Mader
12  */
13 
14 #include "LETypes.h"
15 #include "LEScripts.h"
16 #include "LEFontInstance.h"
17 #include "LEGlyphStorage.h"
18 
19 U_NAMESPACE_BEGIN
20 
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LEFontInstance)21 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LEFontInstance)
22 
23 LECharMapper::~LECharMapper()
24 {
25     // nothing to do.
26 }
27 
~LEFontInstance()28 LEFontInstance::~LEFontInstance()
29 {
30     // nothing to do
31 }
32 
getSubFont(const LEUnicode chars[],le_int32 * offset,le_int32 limit,le_int32 script,LEErrorCode & success) const33 const LEFontInstance *LEFontInstance::getSubFont(const LEUnicode chars[], le_int32 *offset, le_int32 limit,
34                                                        le_int32 script, LEErrorCode &success) const
35 {
36     if (LE_FAILURE(success)) {
37         return NULL;
38     }
39 
40     if (chars == NULL || *offset < 0 || limit < 0 || *offset >= limit || script < 0 || script >= scriptCodeCount) {
41         success = LE_ILLEGAL_ARGUMENT_ERROR;
42         return NULL;
43     }
44 
45     *offset = limit;
46     return this;
47 }
48 
mapCharsToGlyphs(const LEUnicode chars[],le_int32 offset,le_int32 count,le_bool reverse,const LECharMapper * mapper,le_bool filterZeroWidth,LEGlyphStorage & glyphStorage) const49 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
51 {
52     le_int32 i, out = 0, dir = 1;
53 
54     if (reverse) {
55         out = count - 1;
56         dir = -1;
57     }
58 
59     for (i = offset; i < offset + count; i += 1, out += dir) {
60         LEUnicode16 high = chars[i];
61         LEUnicode32 code = high;
62 
63         if (i < offset + count - 1 && high >= 0xD800 && high <= 0xDBFF) {
64             LEUnicode16 low = chars[i + 1];
65 
66             if (low >= 0xDC00 && low <= 0xDFFF) {
67                 code = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
68             }
69         }
70 
71         glyphStorage[out] = mapCharToGlyph(code, mapper, filterZeroWidth);
72 
73         if (code >= 0x10000) {
74             i += 1;
75             glyphStorage[out += dir] = 0xFFFF;
76         }
77     }
78 }
79 
mapCharToGlyph(LEUnicode32 ch,const LECharMapper * mapper) const80 LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
81 {
82     return mapCharToGlyph(ch, mapper, TRUE);
83 }
84 
mapCharToGlyph(LEUnicode32 ch,const LECharMapper * mapper,le_bool filterZeroWidth) const85 LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const
86 {
87     LEUnicode32 mappedChar = mapper->mapChar(ch);
88 
89     if (mappedChar == 0xFFFE || mappedChar == 0xFFFF) {
90         return 0xFFFF;
91     }
92 
93     if (filterZeroWidth && (mappedChar == 0x200C || mappedChar == 0x200D)) {
94         return canDisplay(mappedChar)? 0x0001 : 0xFFFF;
95     }
96 
97     return mapCharToGlyph(mappedChar);
98 }
99 
canDisplay(LEUnicode32 ch) const100 le_bool LEFontInstance::canDisplay(LEUnicode32 ch) const
101 {
102     return LE_GET_GLYPH(mapCharToGlyph(ch)) != 0;
103 }
104 
xUnitsToPoints(float xUnits) const105 float LEFontInstance::xUnitsToPoints(float xUnits) const
106 {
107     return (xUnits * getXPixelsPerEm()) / (float) getUnitsPerEM();
108 }
109 
yUnitsToPoints(float yUnits) const110 float LEFontInstance::yUnitsToPoints(float yUnits) const
111 {
112     return (yUnits * getYPixelsPerEm()) / (float) getUnitsPerEM();
113 }
114 
unitsToPoints(LEPoint & units,LEPoint & points) const115 void LEFontInstance::unitsToPoints(LEPoint &units, LEPoint &points) const
116 {
117     points.fX = xUnitsToPoints(units.fX);
118     points.fY = yUnitsToPoints(units.fY);
119 }
120 
xPixelsToUnits(float xPixels) const121 float LEFontInstance::xPixelsToUnits(float xPixels) const
122 {
123     return (xPixels * getUnitsPerEM()) / (float) getXPixelsPerEm();
124 }
125 
yPixelsToUnits(float yPixels) const126 float LEFontInstance::yPixelsToUnits(float yPixels) const
127 {
128     return (yPixels * getUnitsPerEM()) / (float) getYPixelsPerEm();
129 }
130 
pixelsToUnits(LEPoint & pixels,LEPoint & units) const131 void LEFontInstance::pixelsToUnits(LEPoint &pixels, LEPoint &units) const
132 {
133     units.fX = xPixelsToUnits(pixels.fX);
134     units.fY = yPixelsToUnits(pixels.fY);
135 }
136 
transformFunits(float xFunits,float yFunits,LEPoint & pixels) const137 void LEFontInstance::transformFunits(float xFunits, float yFunits, LEPoint &pixels) const
138 {
139     pixels.fX = xUnitsToPoints(xFunits) * getScaleFactorX();
140     pixels.fY = yUnitsToPoints(yFunits) * getScaleFactorY();
141 }
142 
getLineHeight() const143 le_int32 LEFontInstance::getLineHeight() const
144 {
145     return getAscent() + getDescent() + getLeading();
146 }
147 
148 U_NAMESPACE_END
149 
150