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/*
*
* (C) Copyright IBM Corp. 1998-2008 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "GlyphPositionAdjustments.h"
#include "LEGlyphStorage.h"
#include "LEFontInstance.h"
U_NAMESPACE_BEGIN
#define CHECK_ALLOCATE_ARRAY(array, type, size) \
if (array == NULL) { \
array = (type *) new type[size]; \
}
GlyphPositionAdjustments::GlyphPositionAdjustments(le_int32 glyphCount)
: fGlyphCount(glyphCount), fEntryExitPoints(NULL), fAdjustments(NULL)
{
fAdjustments = (Adjustment *) new Adjustment[glyphCount];
}
GlyphPositionAdjustments::~GlyphPositionAdjustments()
{
delete[] fEntryExitPoints;
delete[] fAdjustments;
}
const LEPoint *GlyphPositionAdjustments::getEntryPoint(le_int32 index, LEPoint &entryPoint) const
{
if (fEntryExitPoints == NULL) {
return NULL;
}
return fEntryExitPoints[index].getEntryPoint(entryPoint);
}
const LEPoint *GlyphPositionAdjustments::getExitPoint(le_int32 index, LEPoint &exitPoint)const
{
if (fEntryExitPoints == NULL) {
return NULL;
}
return fEntryExitPoints[index].getExitPoint(exitPoint);
}
void GlyphPositionAdjustments::clearEntryPoint(le_int32 index)
{
CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
fEntryExitPoints[index].clearEntryPoint();
}
void GlyphPositionAdjustments::clearExitPoint(le_int32 index)
{
CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
fEntryExitPoints[index].clearExitPoint();
}
void GlyphPositionAdjustments::setEntryPoint(le_int32 index, LEPoint &newEntryPoint, le_bool baselineIsLogicalEnd)
{
CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
fEntryExitPoints[index].setEntryPoint(newEntryPoint, baselineIsLogicalEnd);
}
void GlyphPositionAdjustments::setExitPoint(le_int32 index, LEPoint &newExitPoint, le_bool baselineIsLogicalEnd)
{
CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
fEntryExitPoints[index].setExitPoint(newExitPoint, baselineIsLogicalEnd);
}
void GlyphPositionAdjustments::setCursiveGlyph(le_int32 index, le_bool baselineIsLogicalEnd)
{
CHECK_ALLOCATE_ARRAY(fEntryExitPoints, EntryExitPoint, fGlyphCount);
fEntryExitPoints[index].setCursiveGlyph(baselineIsLogicalEnd);
}
void GlyphPositionAdjustments::applyCursiveAdjustments(LEGlyphStorage &glyphStorage, le_bool rightToLeft, const LEFontInstance *fontInstance)
{
if (! hasCursiveGlyphs()) {
return;
}
le_int32 start = 0, end = fGlyphCount, dir = 1;
le_int32 firstExitPoint = -1, lastExitPoint = -1;
LEPoint entryAnchor, exitAnchor, pixels;
LEGlyphID lastExitGlyphID = 0;
float baselineAdjustment = 0;
// This removes a possible warning about
// using exitAnchor before it's been initialized.
exitAnchor.fX = exitAnchor.fY = 0;
if (rightToLeft) {
start = fGlyphCount - 1;
end = -1;
dir = -1;
}
for (le_int32 i = start; i != end; i += dir) {
LEGlyphID glyphID = glyphStorage[i];
if (isCursiveGlyph(i)) {
if (lastExitPoint >= 0 && getEntryPoint(i, entryAnchor) != NULL) {
float anchorDiffX = exitAnchor.fX - entryAnchor.fX;
float anchorDiffY = exitAnchor.fY - entryAnchor.fY;
baselineAdjustment += anchorDiffY;
adjustYPlacement(i, baselineAdjustment);
if (rightToLeft) {
LEPoint secondAdvance;
fontInstance->getGlyphAdvance(glyphID, pixels);
fontInstance->pixelsToUnits(pixels, secondAdvance);
adjustXAdvance(i, -(anchorDiffX + secondAdvance.fX));
} else {
LEPoint firstAdvance;
fontInstance->getGlyphAdvance(lastExitGlyphID, pixels);
fontInstance->pixelsToUnits(pixels, firstAdvance);
adjustXAdvance(lastExitPoint, anchorDiffX - firstAdvance.fX);
}
}
lastExitPoint = i;
if (getExitPoint(i, exitAnchor) != NULL) {
if (firstExitPoint < 0) {
firstExitPoint = i;
}
lastExitGlyphID = glyphID;
} else {
if (baselineIsLogicalEnd(i) && firstExitPoint >= 0 && lastExitPoint >= 0) {
le_int32 limit = lastExitPoint /*+ dir*/;
LEPoint dummyAnchor;
if (getEntryPoint(i, dummyAnchor) != NULL) {
limit += dir;
}
for (le_int32 j = firstExitPoint; j != limit; j += dir) {
if (isCursiveGlyph(j)) {
adjustYPlacement(j, -baselineAdjustment);
}
}
}
firstExitPoint = lastExitPoint = -1;
baselineAdjustment = 0;
}
}
}
}
LEPoint *GlyphPositionAdjustments::EntryExitPoint::getEntryPoint(LEPoint &entryPoint) const
{
if (fFlags & EEF_HAS_ENTRY_POINT) {
entryPoint = fEntryPoint;
return &entryPoint;
}
return NULL;
}
LEPoint *GlyphPositionAdjustments::EntryExitPoint::getExitPoint(LEPoint &exitPoint) const
{
if (fFlags & EEF_HAS_EXIT_POINT) {
exitPoint = fExitPoint;
return &exitPoint;
}
return NULL;
}
U_NAMESPACE_END
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