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