https://bugs.freedesktop.org/show_bug.cgi?id=56851
--- Comment #8 from Flex Liu <wind...@gmail.com> ---
>
> Mostly the root cause start in code:
> /core/chart2/source/tools/ReferenceSizeProvider.cxx
Sorry, the root cause should be in code:
/core/svx/source/svdraw/svdotext.cxx
1254 void SdrTextObj::ImpAutoFitText( SdrOutliner& rOutliner ) const
1255 {
1256 const Size aShapeSize=GetSnapRect().GetSize();
1257 ImpAutoFitText( rOutliner,
1258
Size(aShapeSize.Width()-GetTextLeftDistance()-GetTextRightDistance(),
1259
aShapeSize.Height()-GetTextUpperDistance()-GetTextLowerDistance()),
1260 IsVerticalWriting() );
1261 }
1262
1263 void SdrTextObj::ImpAutoFitText( SdrOutliner& rOutliner, const Size&
rTextSize, bool bIsVerticalWriting )
1264 {
1265 // EditEngine formatting is unstable enough for
1266 // line-breaking text that we need some more samples
1267
1268 // loop early-exits if we detect an already attained value
1269 sal_uInt16 nMinStretchX=0, nMinStretchY=0;
1270 sal_uInt16 aOldStretchXVals[]={0,0,0,0,0,0,0,0,0,0};
1271 const size_t aStretchArySize=SAL_N_ELEMENTS(aOldStretchXVals);
1272 for(unsigned int i=0; i<aStretchArySize; ++i)
1273 {
1274 const Size aCurrTextSize = rOutliner.CalcTextSizeNTP();
1275 double fFactor(1.0);
1276 if( bIsVerticalWriting )
1277 fFactor = double(rTextSize.Width())/aCurrTextSize.Width();
1278 else
1279 fFactor =
double(rTextSize.Height())/aCurrTextSize.Height();
1280
1281 sal_uInt16 nCurrStretchX, nCurrStretchY;
1282 rOutliner.GetGlobalCharStretching(nCurrStretchX,
nCurrStretchY);
1283
1284 if (fFactor >= 1.0 )
1285 {
1286 // resulting text area fits into available shape rect -
1287 // err on the larger stretching, to optimally fill area
1288 nMinStretchX = std::max(nMinStretchX,nCurrStretchX);
1289 nMinStretchY = std::max(nMinStretchY,nCurrStretchY);
1290 }
1291
1292 aOldStretchXVals[i] = nCurrStretchX;
1293 if( std::find(aOldStretchXVals, aOldStretchXVals+i,
nCurrStretchX) != aOldStretchXVals+i )
1294 break; // same value already attained once; algo is
looping, exit
1295
1296 if (fFactor < 1.0 || (fFactor >= 1.0 && nCurrStretchX != 100))
1297 {
1298 nCurrStretchX =
sal::static_int_cast<sal_uInt16>(nCurrStretchX*fFactor);
1299 nCurrStretchY =
sal::static_int_cast<sal_uInt16>(nCurrStretchY*fFactor);
1300
rOutliner.SetGlobalCharStretching(std::min(sal_uInt16(100),nCurrStretchX),
1301
std::min(sal_uInt16(100),nCurrStretchY));
1302 OSL_TRACE("SdrTextObj::onEditOutlinerStatusEvent(): zoom is
%d", nCurrStretchX);
1303 }
1304 }
1305
1306 OSL_TRACE("---- SdrTextObj::onEditOutlinerStatusEvent(): final zoom
is %d ----", nMinStretchX);
1307
rOutliner.SetGlobalCharStretching(std::min(sal_uInt16(100),nMinStretchX),
1308
std::min(sal_uInt16(100),nMinStretchY));
1309 }
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