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