icuSources/layout/LEFontInstance.cpp

   1 /*
   2  *******************************************************************************
   3  *
   4  *   Copyright (C) 1999-2004, 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
  21 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LEFontInstance)
  22
  23 const LEFontInstance *LEFontInstance::getSubFont(const LEUnicode chars[], le_int32 *offset, le_int32 limit,
  24                                                        le_int32 script, LEErrorCode &success) const
  25 {
  26     if (LE_FAILURE(success)) {
  27         return NULL;
  28     }
  29
  30     if (chars == NULL || *offset < 0 || limit < 0 || *offset >= limit || script < 0 || script >= scriptCodeCount) {
  31         success = LE_ILLEGAL_ARGUMENT_ERROR;
  32         return NULL;
  33     }
  34
  35     *offset = limit;
  36     return this;
  37 }
  38
  39 void LEFontInstance::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count,
  40                                       le_bool reverse, const LECharMapper *mapper, LEGlyphStorage &glyphStorage) const
  41 {
  42     le_int32 i, out = 0, dir = 1;
  43
  44     if (reverse) {
  45         out = count - 1;
  46         dir = -1;
  47     }
  48
  49     for (i = offset; i < offset + count; i += 1, out += dir) {
  50         LEUnicode16 high = chars[i];
  51         LEUnicode32 code = high;
  52
  53         if (i < offset + count - 1 && high >= 0xD800 && high <= 0xDBFF) {
  54             LEUnicode16 low = chars[i + 1];
  55
  56             if (low >= 0xDC00 && low <= 0xDFFF) {
  57                 code = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
  58             }
  59         }
  60
  61         glyphStorage[out] = mapCharToGlyph(code, mapper);
  62
  63         if (code >= 0x10000) {
  64             i += 1;
  65             glyphStorage[out += dir] = 0xFFFF;
  66         }
  67     }
  68 }
  69
  70 LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
  71 {
  72     LEUnicode32 mappedChar = mapper->mapChar(ch);
  73
  74     if (mappedChar == 0xFFFE || mappedChar == 0xFFFF) {
  75         return 0xFFFF;
  76     }
  77
  78     if (mappedChar == 0x200C || mappedChar == 0x200D) {
  79         return 1;
  80     }
  81
  82     return mapCharToGlyph(mappedChar);
  83 }
  84 U_NAMESPACE_END
  85