icuSources/samples/layout/ScriptCompositeFontInstance.cpp

   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