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Fix crash with clips entirely outside glyph map

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When the range to work on is empty just continue to next span.

Task-number: QTBUG-63412
Change-Id: Ic5cb77ed438eb9c218f482095aa0cd4e3c2fc6e6
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
This commit is contained in:
Allan Sandfeld Jensen 2017-09-26 10:57:04 +02:00 committed by Jani Heikkinen
parent 2b51ad4712
commit 807fa90b32
1 changed files with 4 additions and 0 deletions
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4
src/gui/painting/qdrawhelper.cpp
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@ -5627,6 +5627,8 @@ static void qt_alphamapblit_generic(QRasterBuffer *rasterBuffer,
int start = qMax<int>(x, clip.x);
int end = qMin<int>(x + mapWidth, clip.x + clip.len);
if (end <= start)
continue;
Q_ASSERT(end - start <= buffer_size);
QRgba64 *dest = destFetch64((QRgba64*)buffer, rasterBuffer, start, clip.y, end - start);
@ -5900,6 +5902,8 @@ static void qt_alphargbblit_generic(QRasterBuffer *rasterBuffer,
int start = qMax<int>(x, clip.x);
int end = qMin<int>(x + mapWidth, clip.x + clip.len);
if (end <= start)
continue;
Q_ASSERT(end - start <= buffer_size);
QRgba64 *dest = destFetch64((QRgba64*)buffer, rasterBuffer, start, clip.y, end - start);