Home | History | Annotate | Download | only in layout 
      1 /*
      2  *******************************************************************************
      3  *
      4  *   Copyright (C) 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 
    110