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/*
*******************************************************************************
*
* Copyright (C) 1999-2008, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: PortableFontInstance.cpp
*
* created on: 11/22/1999
* created by: Eric R. Mader
*/
#include <stdio.h>
#include "layout/LETypes.h"
#include "layout/LEFontInstance.h"
#include "layout/LESwaps.h"
#include "PortableFontInstance.h"
#include "letest.h"
#include "sfnt.h"
#include <string.h>
PortableFontInstance::PortableFontInstance(hb_face_t *face,
float xScale,
float yScale,
unsigned int xPixelsPerEM,
unsigned int yPixelsPerEM,
LEErrorCode &status)
: fFace(face),
fXScale(xScale), fYScale(yScale),
fXPixelsPerEM(xPixelsPerEM), fYPixelsPerEM(yPixelsPerEM),
fUnitsPerEM(0), fAscent(0), fDescent(0), fLeading(0),
fNAMETable(NULL), fNameCount(0), fNameStringOffset(0), fCMAPMapper(NULL), fHMTXTable(NULL), fNumGlyphs(0), fNumLongHorMetrics(0)
{
if (LE_FAILURE(status)) {
return;
}
const LETag hheaTag = LE_HHEA_TABLE_TAG;
const HHEATable *hheaTable = NULL;
fUnitsPerEM = hb_face_get_upem (face);
hheaTable = (HHEATable *) getFontTable(hheaTag);
if (hheaTable == NULL) {
status = LE_MISSING_FONT_TABLE_ERROR;
return;
}
fAscent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->ascent));
fDescent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->descent));
fLeading = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->lineGap));
fNumLongHorMetrics = SWAPW(hheaTable->numOfLongHorMetrics);
fCMAPMapper = findUnicodeMapper();
if (fCMAPMapper == NULL) {
status = LE_MISSING_FONT_TABLE_ERROR;
return;
}
}
PortableFontInstance::~PortableFontInstance()
{
if (fCMAPMapper)
delete fCMAPMapper;
}
const void *PortableFontInstance::getFontTable(LETag tableTag) const
{
return FontTableCache::find(tableTag);
}
hb_blob_t *PortableFontInstance::readFontTable(LETag tableTag) const
{
return hb_face_reference_table(fFace, tableTag);
}
CMAPMapper *PortableFontInstance::findUnicodeMapper()
{
LETag cmapTag = LE_CMAP_TABLE_TAG;
const CMAPTable *cmap = (CMAPTable *) getFontTable(cmapTag);
if (cmap == NULL) {
return NULL;
}
return CMAPMapper::createUnicodeMapper(cmap);
}
const char *PortableFontInstance::getNameString(le_uint16 nameID, le_uint16 platformID, le_uint16 encodingID, le_uint16 languageID) const
{
if (fNAMETable == NULL) {
LETag nameTag = LE_NAME_TABLE_TAG;
PortableFontInstance *realThis = (PortableFontInstance *) this;
realThis->fNAMETable = (const NAMETable *) getFontTable(nameTag);
if (realThis->fNAMETable != NULL) {
realThis->fNameCount = SWAPW(realThis->fNAMETable->count);
realThis->fNameStringOffset = SWAPW(realThis->fNAMETable->stringOffset);
}
}
for(le_int32 i = 0; i < fNameCount; i += 1) {
const NameRecord *nameRecord = &fNAMETable->nameRecords[i];
if (SWAPW(nameRecord->platformID) == platformID && SWAPW(nameRecord->encodingID) == encodingID &&
SWAPW(nameRecord->languageID) == languageID && SWAPW(nameRecord->nameID) == nameID) {
char *name = ((char *) fNAMETable) + fNameStringOffset + SWAPW(nameRecord->offset);
le_uint16 length = SWAPW(nameRecord->length);
char *result = NEW_ARRAY(char, length + 2);
ARRAY_COPY(result, name, length);
result[length] = result[length + 1] = 0;
return result;
}
}
return NULL;
}
const LEUnicode16 *PortableFontInstance::getUnicodeNameString(le_uint16 nameID, le_uint16 platformID, le_uint16 encodingID, le_uint16 languageID) const
{
if (fNAMETable == NULL) {
LETag nameTag = LE_NAME_TABLE_TAG;
PortableFontInstance *realThis = (PortableFontInstance *) this;
realThis->fNAMETable = (const NAMETable *) getFontTable(nameTag);
if (realThis->fNAMETable != NULL) {
realThis->fNameCount = SWAPW(realThis->fNAMETable->count);
realThis->fNameStringOffset = SWAPW(realThis->fNAMETable->stringOffset);
}
}
for(le_int32 i = 0; i < fNameCount; i += 1) {
const NameRecord *nameRecord = &fNAMETable->nameRecords[i];
if (SWAPW(nameRecord->platformID) == platformID && SWAPW(nameRecord->encodingID) == encodingID &&
SWAPW(nameRecord->languageID) == languageID && SWAPW(nameRecord->nameID) == nameID) {
LEUnicode16 *name = (LEUnicode16 *) (((char *) fNAMETable) + fNameStringOffset + SWAPW(nameRecord->offset));
le_uint16 length = SWAPW(nameRecord->length) / 2;
LEUnicode16 *result = NEW_ARRAY(LEUnicode16, length + 2);
for (le_int32 c = 0; c < length; c += 1) {
result[c] = SWAPW(name[c]);
}
result[length] = 0;
return result;
}
}
return NULL;
}
void PortableFontInstance::deleteNameString(const char *name) const
{
DELETE_ARRAY(name);
}
void PortableFontInstance::deleteNameString(const LEUnicode16 *name) const
{
DELETE_ARRAY(name);
}
void PortableFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
{
TTGlyphID ttGlyph = (TTGlyphID) LE_GET_GLYPH(glyph);
if (fHMTXTable == NULL) {
LETag maxpTag = LE_MAXP_TABLE_TAG;
LETag hmtxTag = LE_HMTX_TABLE_TAG;
const MAXPTable *maxpTable = (MAXPTable *) getFontTable(maxpTag);
PortableFontInstance *realThis = (PortableFontInstance *) this;
if (maxpTable != NULL) {
realThis->fNumGlyphs = SWAPW(maxpTable->numGlyphs);
}
realThis->fHMTXTable = (const HMTXTable *) getFontTable(hmtxTag);
}
le_uint16 index = ttGlyph;
if (ttGlyph >= fNumGlyphs || fHMTXTable == NULL) {
advance.fX = advance.fY = 0;
return;
}
if (ttGlyph >= fNumLongHorMetrics) {
index = fNumLongHorMetrics - 1;
}
transformFunits (SWAPW(fHMTXTable->hMetrics[index].advanceWidth), 0, advance);
}
le_bool PortableFontInstance::getGlyphPoint(LEGlyphID /*glyph*/, le_int32 /*pointNumber*/, LEPoint &/*point*/) const
{
return FALSE;
}
le_int32 PortableFontInstance::getUnitsPerEM() const
{
return fUnitsPerEM;
}
le_uint32 PortableFontInstance::getFontChecksum() const
{
return 0;
}
le_int32 PortableFontInstance::getAscent() const
{
return fAscent;
}
le_int32 PortableFontInstance::getDescent() const
{
return fDescent;
}
le_int32 PortableFontInstance::getLeading() const
{
return fLeading;
}
// We really want to inherit this method from the superclass, but some compilers
// issue a warning if we don't implement it...
LEGlyphID PortableFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const
{
return LEFontInstance::mapCharToGlyph(ch, mapper, filterZeroWidth);
}
// We really want to inherit this method from the superclass, but some compilers
// issue a warning if we don't implement it...
LEGlyphID PortableFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
{
return LEFontInstance::mapCharToGlyph(ch, mapper);
}
LEGlyphID PortableFontInstance::mapCharToGlyph(LEUnicode32 ch) const
{
return fCMAPMapper->unicodeToGlyph(ch);
}
float PortableFontInstance::getXPixelsPerEm() const
{
return fXPixelsPerEM;
}
float PortableFontInstance::getYPixelsPerEm() const
{
return fYPixelsPerEM;
}
float PortableFontInstance::getScaleFactorX() const
{
return fXScale;
}
float PortableFontInstance::getScaleFactorY() const
{
return fYScale;
}
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