165 lines
4.4 KiB
C++
165 lines
4.4 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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*******************************************************************************
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* file name: RenderingFontInstance.cpp
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*
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* created on: 10/22/2001
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* created by: Eric R. Mader
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*/
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#include "LETypes.h"
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#include "LEFontInstance.h"
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#include "RenderingFontInstance.h"
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#include "LESwaps.h"
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#include "sfnt.h"
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#include "cmaps.h"
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#include <string.h>
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RenderingFontInstance::RenderingFontInstance(void *surface, le_int16 pointSize)
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: fSurface(surface), fPointSize(pointSize), fUnitsPerEM(0), fAscent(0), fDescent(), fLeading(0),
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fTableCache(NULL), fTableCacheCurr(0), fTableCacheSize(0), fMapper(NULL)
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{
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// we expect the subclass to call
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// initMapper() and initFontTableCache
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}
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RenderingFontInstance::~RenderingFontInstance()
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{
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flushFontTableCache();
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delete[] fTableCache;
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delete fMapper;
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}
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void RenderingFontInstance::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count,
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le_bool reverse, const LECharMapper *mapper, LEGlyphID glyphs[]) const
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{
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le_int32 i, out = 0, dir = 1;
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if (reverse) {
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out = count - 1;
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dir = -1;
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}
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for (i = offset; i < offset + count; i += 1, out += dir) {
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LEUnicode16 high = chars[i];
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LEUnicode32 code = high;
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if (i < offset + count - 1 && high >= 0xD800 && high <= 0xDBFF) {
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LEUnicode16 low = chars[i + 1];
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if (low >= 0xDC00 && low <= 0xDFFF) {
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code = (high - 0xD800) * 0x400 + low - 0xDC00 + 0x10000;
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}
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}
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glyphs[out] = mapCharToGlyph(code, mapper);
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if (code >= 0x10000) {
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i += 1;
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glyphs[out += dir] = 0xFFFF;
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}
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}
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}
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LEGlyphID RenderingFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
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{
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LEUnicode32 mappedChar = mapper->mapChar(ch);
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if (mappedChar == 0xFFFE || mappedChar == 0xFFFF) {
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return 0xFFFF;
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}
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if (mappedChar == 0x200C || mappedChar == 0x200D) {
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return 1;
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}
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return fMapper->unicodeToGlyph(mappedChar);
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}
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const void *RenderingFontInstance::getFontTable(LETag tableTag) const
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{
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for (int i = 0; i < fTableCacheCurr; i += 1) {
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if (fTableCache[i].tag == tableTag) {
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return fTableCache[i].table;
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}
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}
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RenderingFontInstance *realThis = (RenderingFontInstance *) this;
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if (realThis->fTableCacheCurr >= realThis->fTableCacheSize) {
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le_int32 newSize = realThis->fTableCacheSize + TABLE_CACHE_GROW;
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TableCacheEntry *newTable = new TableCacheEntry[newSize];
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// FIXME: need a better strategy than this...
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if (newTable == NULL) {
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return NULL;
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}
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memcpy(newTable, realThis->fTableCache, realThis->fTableCacheSize * sizeof realThis->fTableCache[0]);
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delete[] realThis->fTableCache;
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for (int i = realThis->fTableCacheSize; i < newSize; i += 1) {
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newTable[i].tag = 0;
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newTable[i].table = NULL;
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}
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realThis->fTableCache = newTable;
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realThis->fTableCacheSize = newSize;
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}
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realThis->fTableCache[realThis->fTableCacheCurr].tag = tableTag;
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realThis->fTableCache[realThis->fTableCacheCurr].table = (void *) realThis->readFontTable(tableTag);
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return fTableCache[realThis->fTableCacheCurr++].table;
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};
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RFIErrorCode RenderingFontInstance::initMapper()
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{
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LETag cmapTag = 0x636D6170; // 'cmap'
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const CMAPTable *cmap = (const CMAPTable *) readFontTable(cmapTag);
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if (cmap == NULL) {
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return RFI_MISSING_FONT_TABLE_ERROR;
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}
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fMapper = CMAPMapper::createUnicodeMapper(cmap);
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if (fMapper == NULL) {
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return RFI_MISSING_FONT_TABLE_ERROR;
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}
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return RFI_NO_ERROR;
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}
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RFIErrorCode RenderingFontInstance::initFontTableCache()
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{
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fTableCacheSize = TABLE_CACHE_INIT;
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fTableCache = new TableCacheEntry[fTableCacheSize];
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if (fTableCache == 0) {
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return RFI_OUT_OF_MEMORY_ERROR;
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}
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for (int i = 0; i < fTableCacheSize; i += 1) {
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fTableCache[i].tag = 0;
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fTableCache[i].table = NULL;
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}
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return RFI_NO_ERROR;
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}
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void RenderingFontInstance::flushFontTableCache()
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{
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for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
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delete[] (char *) fTableCache[i].table;
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}
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fTableCacheCurr = 0;
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}
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