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/*
*
* (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "OpenTypeTables.h"
#include "OpenTypeUtilities.h"
#include "LESwaps.h"
U_NAMESPACE_BEGIN
//
// Finds the high bit by binary searching
// through the bits in n.
//
le_int8 OpenTypeUtilities::highBit(le_int32 value)
{
if (value <= 0) {
return -32;
}
le_uint8 bit = 0;
if (value >= 1 << 16) {
value >>= 16;
bit += 16;
}
if (value >= 1 << 8) {
value >>= 8;
bit += 8;
}
if (value >= 1 << 4) {
value >>= 4;
bit += 4;
}
if (value >= 1 << 2) {
value >>= 2;
bit += 2;
}
if (value >= 1 << 1) {
value >>= 1;
bit += 1;
}
return bit;
}
Offset OpenTypeUtilities::getTagOffset(LETag tag, const LEReferenceToArrayOf<TagAndOffsetRecord> &records, LEErrorCode &success)
{
const TagAndOffsetRecord *r0 = (const TagAndOffsetRecord*)records.getAlias();
if(LE_FAILURE(success)) return 0;
le_uint32 recordCount = records.getCount();
le_uint8 bit = highBit(recordCount);
le_int32 power = 1 << bit;
le_int32 extra = recordCount - power;
le_int32 probe = power;
le_int32 index = 0;
{
const ATag &aTag = (r0+extra)->tag;
if (SWAPT(aTag) <= tag) {
index = extra;
}
}
while (probe > (1 << 0)) {
probe >>= 1;
{
const ATag &aTag = (r0+index+probe)->tag;
if (SWAPT(aTag) <= tag) {
index += probe;
}
}
}
{
const ATag &aTag = (r0+index)->tag;
if (SWAPT(aTag) == tag) {
return SWAPW((r0+index)->offset);
}
}
return 0;
}
le_int32 OpenTypeUtilities::getGlyphRangeIndex(TTGlyphID glyphID, const LEReferenceToArrayOf<GlyphRangeRecord> &records, LEErrorCode &success)
{
if(LE_FAILURE(success)) return -1;
le_uint32 recordCount = records.getCount();
le_uint8 bit = highBit(recordCount);
le_int32 power = 1 << bit;
le_int32 extra = recordCount - power;
le_int32 probe = power;
le_int32 range = 0;
if (recordCount == 0) {
return -1;
}
if (SWAPW(records(extra,success).firstGlyph) <= glyphID) {
range = extra;
}
while (probe > (1 << 0) && LE_SUCCESS(success)) {
probe >>= 1;
if (SWAPW(records(range + probe,success).firstGlyph) <= glyphID) {
range += probe;
}
}
if (SWAPW(records(range,success).firstGlyph) <= glyphID && SWAPW(records(range,success).lastGlyph) >= glyphID) {
return range;
}
return -1;
}
le_int32 OpenTypeUtilities::search(le_uint32 value, const le_uint32 array[], le_int32 count)
{
le_int32 power = 1 << highBit(count);
le_int32 extra = count - power;
le_int32 probe = power;
le_int32 index = 0;
if (value >= array[extra]) {
index = extra;
}
while (probe > (1 << 0)) {
probe >>= 1;
if (value >= array[index + probe]) {
index += probe;
}
}
return index;
}
le_int32 OpenTypeUtilities::search(le_uint16 value, const le_uint16 array[], le_int32 count)
{
le_int32 power = 1 << highBit(count);
le_int32 extra = count - power;
le_int32 probe = power;
le_int32 index = 0;
if (value >= array[extra]) {
index = extra;
}
while (probe > (1 << 0)) {
probe >>= 1;
if (value >= array[index + probe]) {
index += probe;
}
}
return index;
}
//
// Straight insertion sort from Knuth vol. III, pg. 81
//
void OpenTypeUtilities::sort(le_uint16 *array, le_int32 count)
{
for (le_int32 j = 1; j < count; j += 1) {
le_int32 i;
le_uint16 v = array[j];
for (i = j - 1; i >= 0; i -= 1) {
if (v >= array[i]) {
break;
}
array[i + 1] = array[i];
}
array[i + 1] = v;
}
}
U_NAMESPACE_END
#if LE_ASSERT_BAD_FONT
#include <stdio.h>
static const char *letagToStr(LETag tag, char *str) {
str[0]= 0xFF & (tag>>24);
str[1]= 0xFF & (tag>>16);
str[2]= 0xFF & (tag>>8);
str[3]= 0xFF & (tag>>0);
str[4]= 0;
return str;
}
U_CAPI void U_EXPORT2 _debug_LETableReference(const char *f, int l, const char *msg, const LETableReference *what, const void *ptr, size_t len) {
char tagbuf[5];
fprintf(stderr, "%s:%d: LETableReference@0x%p: ", f, l, what);
fprintf(stderr, msg, ptr, len);
fprintf(stderr, "\n");
for(int depth=0;depth<10&&(what!=NULL);depth++) {
for(int i=0;i<depth;i++) {
fprintf(stderr, " "); // indent
}
if(!what->isValid()) {
fprintf(stderr, "(invalid)");
}
fprintf(stderr, "@%p: tag (%s) font (0x%p), [0x%p+0x%lx]\n", what, letagToStr(what->getTag(), tagbuf), what->getFont(),
what->getAlias(), what->getLength());
what = what->getParent();
}
}
#endif
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