diff options
| -rw-r--r-- | src/kernel/qinternal.cpp | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/kernel/qinternal.cpp b/src/kernel/qinternal.cpp index 4289ecd..cf1e037 100644 --- a/src/kernel/qinternal.cpp +++ b/src/kernel/qinternal.cpp @@ -44,6 +44,11 @@ #include "qpainter.h" #include "qcleanuphandler.h" +// Modern systems (year 2011) have very large screens in excess of 1000 pixels wide +// Some may even have screens in excess of 4000 pixels wide(!) +// Prevent drawing artifacts on such screens +#define USE_HUGE_QT_SHARED_DOUBLE_BUFFERS 1 + static QPixmap* qdb_shared_pixmap = 0; static QPixmap *qdb_force_pixmap = 0; static QSharedDoubleBuffer* qdb_owner = 0; @@ -74,10 +79,16 @@ static const int hardLimitHeight = -1; static const int sharedLimitWidth = 64; static const int sharedLimitHeight = 20; #else +#ifdef USE_HUGE_QT_SHARED_DOUBLE_BUFFERS +// 24M on 32bpp +static const int sharedLimitWidth = 6400; +static const int sharedLimitHeight = 1000; +#else // 240K on 32bpp static const int sharedLimitWidth = 640; static const int sharedLimitHeight = 100; #endif +#endif // ******************************************************************* // QSharedDoubleBufferCleaner declaration and implementation @@ -527,8 +538,13 @@ QPixmap *QSharedDoubleBuffer::getPixmap() if ( rw >= sharedLimitWidth || rh >= sharedLimitHeight ) { if ( flags & Force ) { +#ifdef USE_HUGE_QT_SHARED_DOUBLE_BUFFERS + rw = QMIN(rw, 16000); + rh = QMIN(rh, 16000); +#else rw = QMIN(rw, 8000); rh = QMIN(rh, 8000); +#endif // need to create a big pixmap and start the cleaner if ( ! qdb_force_pixmap ) { qdb_force_pixmap = new QPixmap( rw, rh ); |