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Improve prediction of block outside covered areas

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This commit is contained in:
Guillaume Munch 2016-12-04 18:28:02 +01:00
parent b329b471d4
commit dbcbf305b2
1 changed files with 12 additions and 5 deletions
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17
src/frontends/qt4/GuiSymbols.cpp
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@ -152,6 +152,7 @@ const int no_blocks = sizeof(unicode_blocks) / sizeof(UnicodeBlocks);
QString getBlock(char_type c)
{
// store an educated guess for the next search
// 0 <= lastBlock < no_blocks
// FIXME THREAD
static int lastBlock = 0;
@ -159,10 +160,6 @@ QString getBlock(char_type c)
if (c < 0x7f)
lastBlock = 0;
// off the end already
if (lastBlock == no_blocks)
return QString();
// c falls into a covered area, and we can guess which
if (c >= unicode_blocks[lastBlock].start
&& c <= unicode_blocks[lastBlock].end)
@ -177,8 +174,18 @@ QString getBlock(char_type c)
int i = 0;
while (i < no_blocks && c > unicode_blocks[i].end)
++i;
if (i == no_blocks || c < unicode_blocks[i].start)
if (i == no_blocks)
return QString();
if (c < unicode_blocks[i].start) {
// 0 < i < no_blocks
// cache the previous block for guessing next time
lastBlock = i - 1;
return QString();
}
// 0 <= i < no_blocks
// cache the last block for guessing next time
lastBlock = i;
return unicode_blocks[lastBlock].qname;