From 30f413b74f883f7e3984dfe39d825aa6c5f16132 Mon Sep 17 00:00:00 2001
From: Kim Motoyoshi Kalland <kim.kalland@nokia.com>
Date: Mon, 5 Oct 2009 14:55:50 +0200
Subject: Fixed noisy looking textures in Basic Drawing example with GL2
engine.
When running the Basic Drawing example with the GL2 paint engine and
antialiasing enabled, textures looked noisy. When antialiasing was
enabled, the example translated the painter half a pixel to get sharp
lines. This caused the textures to be sampled at texel corners. Without
linear interpolation, sampling textures at texel corners is
unpredictable. The fix is to not translate the painter.
Reviewed-by: Gunnar
---
examples/painting/basicdrawing/renderarea.cpp | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/examples/painting/basicdrawing/renderarea.cpp b/examples/painting/basicdrawing/renderarea.cpp
index e8222af..4f07a2d 100644
--- a/examples/painting/basicdrawing/renderarea.cpp
+++ b/examples/painting/basicdrawing/renderarea.cpp
@@ -136,11 +136,9 @@ void RenderArea::paintEvent(QPaintEvent * /* event */)
QPainter painter(this);
painter.setPen(pen);
painter.setBrush(brush);
- if (antialiased) {
+ if (antialiased)
painter.setRenderHint(QPainter::Antialiasing, true);
//! [9]
- painter.translate(+0.5, +0.5);
- }
//! [10]
for (int x = 0; x < width(); x += 100) {
@@ -202,6 +200,7 @@ void RenderArea::paintEvent(QPaintEvent * /* event */)
}
}
+ painter.setRenderHint(QPainter::Antialiasing, false);
painter.setPen(palette().dark().color());
painter.setBrush(Qt::NoBrush);
painter.drawRect(QRect(0, 0, width() - 1, height() - 1));
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