icuSources/layout/GXLayoutEngine.cpp

   1
   2 /*
   3  * @(#)GXLayoutEngine.cpp       1.5 00/03/15
   4  *
   5  * (C) Copyright IBM Corp. 1998-2003 - All Rights Reserved
   6  *
   7  */
   8
   9 #include "LETypes.h"
  10 #include "LayoutEngine.h"
  11 #include "GXLayoutEngine.h"
  12
  13 #include "MorphTables.h"
  14
  15 U_NAMESPACE_BEGIN
  16
  17 const char GXLayoutEngine::fgClassID=0;
  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, LEGlyphID *&glyphs, le_int32 *&charIndices, 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, glyphs, charIndices, success);
  43
  44     if (LE_FAILURE(success)) {
  45         return 0;
  46     }
  47
  48     fMorphTable->process(glyphs, charIndices, count);
  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*/, LEGlyphID glyphs[], le_int32 glyphCount, float positions[], LEErrorCode &success)
  55 {
  56     if (LE_FAILURE(success)) {
  57         return;
  58     }
  59
  60     if (chars == NULL || glyphs == NULL || positions == NULL || offset < 0 || count < 0 || glyphCount < 0) {
  61         success = LE_ILLEGAL_ARGUMENT_ERROR;
  62         return;
  63     }
  64
  65     // FIXME: no positional processing yet...
  66 }
  67
  68 U_NAMESPACE_END