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