icuSources/samples/layout/ScriptCompositeFontInstance.cpp

   1 /*
   2  *******************************************************************************
   3  *
   4  *   © 2016 and later: Unicode, Inc. and others.
   5  *   License & terms of use: http://www.unicode.org/copyright.html#License
   6  *
   7  *******************************************************************************
   8  *******************************************************************************
   9  *
  10  *   Copyright (C) 1999-2003, International Business Machines
  11  *   Corporation and others.  All Rights Reserved.
  12  *
  13  *******************************************************************************
  14  *   file name:  ScriptCompositeFontInstance.cpp
  15  *
  16  *   created on: 02/05/2003
  17  *   created by: Eric R. Mader
  18  */
  19
  20 #include "layout/LETypes.h"
  21
  22 #include "unicode/uscript.h"
  23
  24 #include "FontMap.h"
  25
  26 #include "ScriptCompositeFontInstance.h"
  27
  28 const char ScriptCompositeFontInstance::fgClassID=0;
  29
  30 ScriptCompositeFontInstance::ScriptCompositeFontInstance(FontMap *fontMap)
  31     : fFontMap(fontMap)
  32 {
  33     // nothing else to do
  34 }
  35
  36 ScriptCompositeFontInstance::~ScriptCompositeFontInstance()
  37 {
  38     delete fFontMap;
  39     fFontMap = NULL;
  40 }
  41
  42 void ScriptCompositeFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
  43 {
  44     LEErrorCode status = LE_NO_ERROR;
  45     le_int32 script = LE_GET_SUB_FONT(glyph);
  46     const LEFontInstance *font = fFontMap->getScriptFont(script, status);
  47
  48     advance.fX = 0;
  49     advance.fY = 0;
  50
  51     if (LE_SUCCESS(status)) {
  52         font->getGlyphAdvance(LE_GET_GLYPH(glyph), advance);
  53     }
  54 }
  55
  56 le_bool ScriptCompositeFontInstance::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const
  57 {
  58     LEErrorCode status = LE_NO_ERROR;
  59     le_int32 script = LE_GET_SUB_FONT(glyph);
  60     const LEFontInstance *font = fFontMap->getScriptFont(script, status);
  61
  62     if (LE_SUCCESS(status)) {
  63         return font->getGlyphPoint(LE_GET_GLYPH(glyph), pointNumber, point);
  64     }
  65
  66     return FALSE;
  67 }
  68
  69 const LEFontInstance *ScriptCompositeFontInstance::getSubFont(const LEUnicode chars[], le_int32 *offset, le_int32 limit, le_int32 script, LEErrorCode &success) const
  70 {
  71     if (LE_FAILURE(success)) {
  72         return NULL;
  73     }
  74
  75     if (chars == NULL || *offset < 0 || limit < 0 || *offset >= limit || script < 0 || script >= scriptCodeCount) {
  76         success = LE_ILLEGAL_ARGUMENT_ERROR;
  77         return NULL;
  78     }
  79
  80     const LEFontInstance *result = fFontMap->getScriptFont(script, success);
  81
  82     if (LE_FAILURE(success)) {
  83         return NULL;
  84     }
  85
  86     *offset = limit;
  87     return result;
  88 }
  89
  90 // This is the really stupid version that doesn't look in any other font for the character...
  91 // It would be better to also look in the "DEFAULT:" font. Another thing to do would be to
  92 // look in all the fonts in some order, script code order being the most obvious...
  93 LEGlyphID ScriptCompositeFontInstance::mapCharToGlyph(LEUnicode32 ch) const
  94 {
  95     UErrorCode  error  = U_ZERO_ERROR;
  96     LEErrorCode status = LE_NO_ERROR;
  97     le_int32 script = uscript_getScript(ch, &error);
  98     const LEFontInstance *scriptFont = fFontMap->getScriptFont(script, status);
  99     LEGlyphID subFont = LE_SET_SUB_FONT(0, script);
 100
 101     if (LE_FAILURE(status)) {
 102         return subFont;
 103     }
 104
 105     LEGlyphID glyph = scriptFont->mapCharToGlyph(ch);
 106
 107     return LE_SET_GLYPH(subFont, glyph);
 108 }
 109