150 lines
3.9 KiB
C++
150 lines
3.9 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2007, 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: LEFontInstance.cpp
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*
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* created on: 02/06/2003
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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 "LEScripts.h"
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#include "LEFontInstance.h"
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#include "LEGlyphStorage.h"
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LEFontInstance)
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LECharMapper::~LECharMapper()
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{
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// nothing to do.
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}
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LEFontInstance::~LEFontInstance()
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{
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// nothing to do
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}
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const LEFontInstance *LEFontInstance::getSubFont(const LEUnicode chars[], le_int32 *offset, le_int32 limit,
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le_int32 script, LEErrorCode &success) const
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{
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if (LE_FAILURE(success)) {
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return NULL;
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}
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if (chars == NULL || *offset < 0 || limit < 0 || *offset >= limit || script < 0 || script >= scriptCodeCount) {
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success = LE_ILLEGAL_ARGUMENT_ERROR;
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return NULL;
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}
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*offset = limit;
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return this;
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}
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void LEFontInstance::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count,
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le_bool reverse, const LECharMapper *mapper, le_bool filterZeroWidth, LEGlyphStorage &glyphStorage) 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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glyphStorage[out] = mapCharToGlyph(code, mapper, filterZeroWidth);
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if (code >= 0x10000) {
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i += 1;
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glyphStorage[out += dir] = 0xFFFF;
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}
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}
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}
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LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
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{
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return mapCharToGlyph(ch, mapper, TRUE);
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}
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LEGlyphID LEFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) 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 (filterZeroWidth && (mappedChar == 0x200C || mappedChar == 0x200D)) {
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return canDisplay(mappedChar)? 0x0001 : 0xFFFF;
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}
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return mapCharToGlyph(mappedChar);
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}
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le_bool LEFontInstance::canDisplay(LEUnicode32 ch) const
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{
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return LE_GET_GLYPH(mapCharToGlyph(ch)) != 0;
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}
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float LEFontInstance::xUnitsToPoints(float xUnits) const
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{
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return (xUnits * getXPixelsPerEm()) / (float) getUnitsPerEM();
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}
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float LEFontInstance::yUnitsToPoints(float yUnits) const
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{
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return (yUnits * getYPixelsPerEm()) / (float) getUnitsPerEM();
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}
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void LEFontInstance::unitsToPoints(LEPoint &units, LEPoint &points) const
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{
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points.fX = xUnitsToPoints(units.fX);
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points.fY = yUnitsToPoints(units.fY);
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}
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float LEFontInstance::xPixelsToUnits(float xPixels) const
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{
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return (xPixels * getUnitsPerEM()) / (float) getXPixelsPerEm();
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}
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float LEFontInstance::yPixelsToUnits(float yPixels) const
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{
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return (yPixels * getUnitsPerEM()) / (float) getYPixelsPerEm();
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}
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void LEFontInstance::pixelsToUnits(LEPoint &pixels, LEPoint &units) const
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{
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units.fX = xPixelsToUnits(pixels.fX);
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units.fY = yPixelsToUnits(pixels.fY);
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}
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void LEFontInstance::transformFunits(float xFunits, float yFunits, LEPoint &pixels) const
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{
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pixels.fX = xUnitsToPoints(xFunits) * getScaleFactorX();
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pixels.fY = yUnitsToPoints(yFunits) * getScaleFactorY();
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}
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le_int32 LEFontInstance::getLineHeight() const
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{
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return getAscent() + getDescent() + getLeading();
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}
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U_NAMESPACE_END
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