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-rw-r--r--tqtinterface/qt4/src/kernel/tqinternal.cpp16
1 files changed, 16 insertions, 0 deletions
diff --git a/tqtinterface/qt4/src/kernel/tqinternal.cpp b/tqtinterface/qt4/src/kernel/tqinternal.cpp
index 7ad13f1..4d80f89 100644
--- a/tqtinterface/qt4/src/kernel/tqinternal.cpp
+++ b/tqtinterface/qt4/src/kernel/tqinternal.cpp
@@ -44,6 +44,11 @@
#include "tqpainter.h"
#include "tqcleanuphandler.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 TQPixmap* qdb_shared_pixmap = 0;
static TQPixmap *qdb_force_pixmap = 0;
static TQSharedDoubleBuffer* qdb_owner = 0;
@@ -74,9 +79,15 @@ 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
// *******************************************************************
@@ -533,8 +544,13 @@ TQPixmap *TQSharedDoubleBuffer::getPixmap()
rw = 4000; // 32MB seems reasonable enough, but the usage is likely to be wider than it is tall (think of multiple wide monitors)
rh = 2000;
#else // USE_QT4
+#ifdef USE_HUGE_QT_SHARED_DOUBLE_BUFFERS
+ rw = TQMIN(rw, 16000);
+ rh = TQMIN(rh, 16000);
+#else
rw = TQMIN(rw, 8000);
rh = TQMIN(rh, 8000);
+#endif
#endif // USE_QT4
// need to create a big pixmap and start the cleaner
if ( ! qdb_force_pixmap ) {