icuSources/layout/GXLayoutEngine.cpp

   1
   2 /*
   3  *
   4  * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
   5  *
   6  */
   7
   8 #include "LETypes.h"
   9 #include "LayoutEngine.h"
  10 #include "GXLayoutEngine.h"
  11 #include "LEGlyphStorage.h"
  12
  13 #include "MorphTables.h"
  14
  15 U_NAMESPACE_BEGIN
  16
  17 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(GXLayoutEngine)
  18
  19 GXLayoutEngine::GXLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, const MorphTableHeader *morphTable)
  20     : LayoutEngine(fontInstance, scriptCode, languageCode), fMorphTable(morphTable)
  21 {
  22     // nothing else to do?
  23 }
  24
  25 GXLayoutEngine::~GXLayoutEngine()
  26 {
  27     reset();
  28 }
  29
  30 // apply 'mort' table
  31 le_int32 GXLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphStorage &glyphStorage, LEErrorCode &success)
  32 {
  33     if (LE_FAILURE(success)) {
  34         return 0;
  35     }
  36
  37     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
  38         success = LE_ILLEGAL_ARGUMENT_ERROR;
  39         return 0;
  40     }
  41
  42     mapCharsToGlyphs(chars, offset, count, FALSE, rightToLeft, glyphStorage, success);
  43
  44     if (LE_FAILURE(success)) {
  45         return 0;
  46     }
  47
  48     fMorphTable->process(glyphStorage);
  49
  50     return count;
  51 }
  52
  53 // apply positional tables
  54 void GXLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool /*reverse*/,
  55                                           LEGlyphStorage &/*glyphStorage*/, LEErrorCode &success)
  56 {
  57     if (LE_FAILURE(success)) {
  58         return;
  59     }
  60
  61     if (chars == NULL || offset < 0 || count < 0) {
  62         success = LE_ILLEGAL_ARGUMENT_ERROR;
  63         return;
  64     }
  65
  66     // FIXME: no positional processing yet...
  67 }
  68
  69 U_NAMESPACE_END